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Relevant bibliographies by topics / DQ axis current control

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Academic literature on the topic 'DQ axis current control'

Author: Grafiati

Published: 5 June 2025

Last updated: 15 July 2025

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Journal articles on the topic "DQ axis current control"

1

Miao, Qiang, Qiang Li, Yamei Xu, Zhichen Lin, Wei Chen, and Xinmin Li. "Virtual Constant Signal Injection-Based MTPA Control for IPMSM Considering Partial Derivative Term of Motor Inductance Parameters." World Electric Vehicle Journal 13, no. 12 (2022): 240. http://dx.doi.org/10.3390/wevj13120240.

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The dq-axis inductance parameter value of the Internal Permanent Magnet Synchronous Motor (IPMSM) will change with the dq-axis current. The Virtual Constant Signal Injection Method (VCSIM)-based Maximum Torque Per Ampere (MTPA) control ignores the partial derivative term of the dq-axis inductance to the dq-axis current when extracting the partial derivative information of the torque to the dq-axis current. This will cause the current to deviate from the MTPA point, which will have a certain impact on the output capacity and efficiency of the motor torque. To solve the above problems, this paper proposes a simple and feasible compensation method by solving the partial derivative information between the dq-axis inductance and the dq-axis current. The experimental results show that the motor efficiency and torque output capability are significantly improved after applying the proposed strategy.

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Son, Dong-Kyun, Soon-Ho Kwon, Dong-Ok Kim, Hee-Sue Song, and Geun-Ho Lee. "Control Comparison for the Coordinate Transformation of an Asymmetric Dual Three Phase Synchronous Motor in Healthy and Single-Phase Open Fault States." Energies 14, no. 6 (2021): 1735. http://dx.doi.org/10.3390/en14061735.

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The coordinate transformation method of asymmetric dual three phase synchronous motor (ADTP-SM) is a Double dq transform using two dq-axes and a vector space decomposition (VSD) model method using the orthogonality of ADTP-SM. There are several studies comparing the two methods in a healthy state, but few in a single-phase open fault state. In the healthy, when the VSD model is applied, different harmonic orders of the phase current are projected onto the dq and xy-axes (the axis for controlling harmonics of the phase current), and the two-axes are orthogonal, so it can be controlled stably. In the single-phase open fault state, the same current control logic as in the healthy situation is applied. When applying the Double dq transform, the dq-axis of the fault set fluctuates, and it affects the healthy set, so it cannot be controlled stably. When applying the VSD model, if both the dq-axis and the xy-axis are controlled, the two coordinate systems do not have orthogonality and cannot be stably controlled, due to mutual interference. However, if only the dq-axis is controlled, it can be controlled stably because there is no Cartesian coordinate system other than the dq-axis. In the healthy state and single-phase open fault state, the equation is verified through experiments and simulations, and the control stability according to the coordinate transformation is compared.

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Costin, Madalin, and Corneliu Lazar. "Field-Oriented Predictive Control Structure for Synchronous Reluctance Motors." Machines 11, no. 7 (2023): 682. http://dx.doi.org/10.3390/machines11070682.

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This paper presents a cascade predictive control structure based on field-oriented control (FOC) in the dq rotor reference frame for the synchronous reluctance machine (SynRM). The constant d-axis current control strategy was used, and thus, the electromagnetic torque was directly controlled by the q-axis current. Because the model of the two axes of currents from the inner loop is a coupled non-linear multivariable one, to control in a non-interaction and linear way the two currents, their decoupling was achieved through feedforward components. Following the decoupling, two independent monovariable linear systems resulted for the two current dynamics that were controlled using model predictive control (MPC) algorithms, considering their ability to automatically handle the state bounds. The most important bounds for SynRM are the limits imposed on currents and voltages, which in the dq plane correspond to a circular limit. To avoid computational effort, linear limitations were adopted through polygonal approximations, resulting in rectangular regions in the dq plane. For the outer loop that controls the angular speed with a constrained MPC algorithm, the q-axis current closed-loop dynamics and the torque linear equation were considered. To evaluate the performance of the proposed cascade predictive control structure, a simulation study using MPC controllers versus PI ones was conducted.

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Cao, Yan Ling, Ping Cao, and Yan Dong Wen. "Inductance Measurement for PMSM Using Instantaneous Flux Linkage Method." Applied Mechanics and Materials 685 (October 2014): 393–96. http://dx.doi.org/10.4028/www.scientific.net/amm.685.393.

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The dq-axis inductances are important for the voltage decoupling control, torque estimation and steady-state performance analysis of a PMSM machine. In this paper, a measurement method is proposed based on the dq-axis instantaneous flux linkages calculation. The rotor is locked by a positive d-axis current, and then a proper AC current is assigned respectively to the d and q-axis reference current in order to cover the various current ranges. The instantaneous flux linkages are calculated by the integration of dq-axis current and voltage offline. Finally, dq-axis inductances are computed by the integrated flux linkages divided by the dq-axis current.

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Lin, Faa-Jeng, Syuan-Yi Chen, Wei-Ting Lin, and Chih-Wei Liu. "An Online Parameter Estimation Using Current Injection with Intelligent Current-Loop Control for IPMSM Drives." Energies 14, no. 23 (2021): 8138. http://dx.doi.org/10.3390/en14238138.

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An online parameter estimation methodology using the d-axis current injection, which can estimate the distorted voltage of the current-controlled voltage source inverter (CCVSI), the varying dq-axis inductances, and the rotor flux, is proposed in this study for interior permanent magnet synchronous motor (IPMSM) drives in the constant torque region. First, a d-axis current injection-based parameter estimation methodology considering the nonlinearity of a CCVSI is proposed. Then, during current injection, a simple linear model is developed to model the cross- and self-saturation of the dq-axis inductances. Since the d-axis unsaturated inductance is difficult to obtain by merely using the recursive least square (RLS) method, a novel tuning method for the d-axis unsaturated inductance is proposed by using the theory of the maximum torque per ampere (MTPA) with the combination of the RLS method. Moreover, to improve the bandwidth of the current loop, an intelligent proportional-integral-derivative (PID) neural network controller with improved online learning algorithm is adopted to replace the traditional PI controller. The estimated the dq-axis inductances and the rotor flux are adopted in the decoupled control of the current loops. Finally, the experimental results at various operating conditions of the IPMSM in the constant torque region are given.

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Sobhy, Ahmed, Ahmed G. Abo-Khalil, Dong Lei, Tareq Salameh, Adel Merabet, and Malek Alkasrawi. "Coupling DFIG-Based Wind Turbines with the Grid under Voltage Imbalance Conditions." Sustainability 14, no. 9 (2022): 5076. http://dx.doi.org/10.3390/su14095076.

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A smooth coupling is implemented between the grid and doubly fed induction generator-based wind turbines (DFIG-WTs) during grid voltage imbalance. The nonlinear characteristics of a grid-connected DFIG-WT system may increase stresses on the mechanical and electrical components of wind turbines. Such difficulties are greatly increased during periods of voltage imbalance. Consequently, in this paper, a new control scheme is proposed to regulate DFIGs in order to support a smooth connection to the grid during voltage imbalance. In synchronization mode, the positive sequence of the rotor dq-axes currents regulates the stator q-axis EMF that is to be synchronized with the q-axis voltage of the grid-side voltage. The phase difference between the grid and stator voltages is compensated by adjusting the stator d-axis EMF to zero. Under normal conditions, a PR controller is used to dampen the negative sequence of the rotor dq-axes currents. PI current controllers are tuned to control the positive sequence of the DFIG rotor currents, while PR current controllers are used to regulate the negative sequence of the rotor currents during synchronization and under normal operation conditions. Experiments are performed to verify the smooth synchronization of the DFIG and the robustness of the proposed control scheme during grid voltage imbalance.

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Huang, Anxue, Zhongxian Chen, and Juanjuan Wang. "Research on the dq-Axis Current Reaction Time of an Interior Permanent Magnet Synchronous Motor for Electric Vehicle." World Electric Vehicle Journal 14, no. 7 (2023): 196. http://dx.doi.org/10.3390/wevj14070196.

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An interior permanent magnet synchronous motor (IPMSM) is a kind of drive motor with high power density that is suitable for electric vehicles. In this paper, the dq-axis current reaction time of IPMSM was investigated in order to improve the reaction time of the electric vehicle. Firstly, the mathematical model of the current-loop decoupling of IPMSM was presented. Secondly, the controller design of dq-axis current-loop decoupling of IPMSM was investigated by the methods of proportional integral (PI) and internal model control PI (IMC-PI). Thirdly, based on the methods of PI and IMC-PI, the influence of the inverter switching frequency on the dq-axis current reaction time of IPMSM was analyzed and simulated, and it was found that the inverter switching frequency only had a significant influence on the parameters set of the PI controller. Lastly, compared with the PI method, the results of the simulation and hardware experiment demonstrate that the dq-axis current reaction time of IPMSM was improved by the IMC-PI method, and the IMC-PI method had the advantage of simple parameters setting and was not influenced by the inverter switching frequency.

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Xing, Feng, Xiaoyu Song, Yuge Gao, and Chaoning Zhang. "Toward Reducing Undesired Rotation Torque in Maglev Permanent Magnet Synchronous Linear Motor." Energies 16, no. 16 (2023): 6066. http://dx.doi.org/10.3390/en16166066.

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The dq current transformation method can be used to achieve the drive control of the maglev permanent magnet synchronous linear motor (MPMSLM). Specifically, the control of the suspension force Fz can be achieved by controlling the d-axis current, and the control of the thrust force Fx can be achieved by controlling the q-axis current. However, the direct use of the dq current transformation method on traditional MPMSLM structures produces an additional rotation torque around the y-axis. In order to reduce this additional torque, a new MPMSLM structure is proposed in this work. First, the characteristics of additional torque through finite element analysis are analyzed. Second, the Halbach permanent magnet array and coil size are optimized, and the topology of the MPMSLM coil is designed to reduce the additional torque. The decoupling performance and current of the proposed MPMSLM are experimentally verified through open-loop experiments using finite element simulation software. Finally, the decoupling algorithm of the generalized inverse matrix is used to achieve the decoupling between forces Fx and Fz and torque Ty and the d-axis and q-axis currents in each drive unit. Based on this, a three-degree-of-freedom closed-loop control system of the MPMSLM is designed. The LabVIEW 2018 software is used for the simulation analysis of the three-degree-of-freedom MPMSLM motion control system, and the results show that the proposed motor structure has superior closed-loop control performance.

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Almamoori, Nawres Ali, Bogdan Dziadak, and Ahmad H. Sabry. "Design of a closed-loop autotune PID controller for three-phase for power factor corrector with Vienna rectifier." Bulletin of Electrical Engineering and Informatics 11, no. 4 (2022): 1798–806. http://dx.doi.org/10.11591/eei.v11i4.3728.

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A closed-loop auto-tuner proportional integral derivative (PID) controller for tuning the DC-link voltage, voltage neutral controllers, and DQ axis current for a power factor corrector with Vienna rectifier is developed and discussed in this study. In traditional tuning of these control loops, it is needed to tune one loop at a time manually, which tends to be a difficult and time-consuming process. In this work, we add a closed-loop PID auto-tuner in the control design will help to simplify and speed up this process by tuning all the 4 PID controllers in a single simulation running in a closed loop. Essentially, it runs auto-tuning experiments for the DQ axis -current, output voltage, and neutral point voltage loops by injecting perturbations; recording the output; estimating the plant frequency response, and tuning the PI controller parameters. In DQ-axis control, projections are used to convert time-based3-phase currents into a time invariant 2-coordinate vector. The results after adding the auto-tuner show that the response time improved considerably when the balanced load was introduced with the individual loads being connected. The results show that the neutral point voltage controller did a good job of keeping the voltage neutral point stable compared to the older controller gains.

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Nawres, Ali Almamoori, Dziadak Bogdan, and H. Sabry Ahmad. "10.11591/eei.v11i4.3728." Bulletin of Electrical Engineering and Informatics 11, no. 4 (2022): Vienna rectifier. https://doi.org/10.11591/eei.v11i4.3728.

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A closed-loop auto-tuner proportional integral derivative (PID) controller for tuning the DC-link voltage, voltage neutral controllers, and DQ axis current for a power factor corrector with Vienna rectifier is developed and discussed in this study. In traditional tuning of these control loops, it is needed to tune one loop at a time manually, which tends to be a difficult and timeconsuming process. In this work, we add a closed-loop PID auto-tuner in the control design will help to simplify and speed up this process by tuning all the 4 PID controllers in a single simulation running in a closed loop. Essentially, it runs auto-tuning experiments for the DQ axis -current, output voltage, and neutral point voltage loops by injecting perturbations; recording the output; estimating the plant frequency response, and tuning the PI controller parameters. In DQ-axis control, projections are used to convert time-based3-phase currents into a time invariant 2-coordinate vector. The results after adding the auto-tuner show that the response time improved considerably when the balanced load was introduced with the individual loads being connected. The results show that the neutral point voltage controller did a good job of keeping the voltage neutral point stable compared to the older controller gains.

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Dissertations / Theses on the topic "DQ axis current control"

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Konghirun, Mongkol. "Fast-transient current control strategy and other issues for vector controlled ac drives." The Ohio State University, 2003. http://rave.ohiolink.edu/etdc/view?acc_num=osu1070302487.

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Najmi, Vahid. "Modeling, Control and Design Considerations for Modular Multilevel Converters." Thesis, Virginia Tech, 2015. http://hdl.handle.net/10919/53703.

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This thesis provides insight into state-of-the-art Modular Multilevel Converters (MMC) for medium and high voltage applications. Modular Multilevel Converters have increased in interest in many industrial applications, as they offer the following advantages: modularity, scalability, reliability, distributed location of capacitors, etc. In this study, the modeling, control and design considerations of modular based multilevel converters, with an emphasis on the reliability of the converter, is carried out. Both modular multilevel converters with half-bridge and full-bridge sub-modules are evaluated in order to provide a complete analysis of the converter. From among the family of modular based hybrid multilevel converters, the newly released Alternate Arm Converter (AAC) is considered for further assessment in this study. Thus, the modular multilevel converter with half-bridge and full-bridge power cells and the Alternate Arm Converter as a commercialized hybrid structure of this family are the main areas of study in this thesis. Finally, the DC fault analysis as one of the main issues related to conventional VSC converters is assessed for Modular Multilevel Converters (MMC) and the DC fault ride-through capability and DC fault current blocking ability is illustrated in both the Modular Multilevel Converter with Full-Bridge (FB) power cells and in the Alternate iii Arm Converter (AAC). Accordingly, the DC fault control scheme employed in the converter and the operation of the converter under the fault control scheme are explained. The main contributions of this study are as follows: The new D-Q model for the MMC is proposed for use in the design of the inner and outer loop control. The extended control scheme from the modular multilevel converter is employed to control the Alternate Arm Converters. A practical reliability-oriented sub-module capacitor bank design is described based on different reliability modeling tools. A Zero Current Switching (ZCS) scheme of the Alternate Arm Converter is presented in order to reduce the switching losses of the Director Switches (DS) and, accordingly, to implement the ZCS, a design procedure for the Arm inductor in the AAC is proposed. The capacitor voltage waveform is extracted analytically in different load power factors and the waveforms are verified by simulation results. A reliability-oriented switching frequency analysis for the modular multilevel converters is carried out to evaluate the effect of the switching frequency on the MMC's operation. For the latter, a DC fault analysis for the MMC with Full-Bridge (FB) power cells and the AAC is performed and a DC fault control scheme is employed to provide the capacitor voltage control and DC fault current limit, and is illustrated herein.<br>Master of Science

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Forslund, Johan. "Experimental Results of a Load-Controlled Vertical Axis Marine Current Energy Converter." Licentiate thesis, Uppsala universitet, Elektricitetslära, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-268867.

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This thesis investigates the load control of a marine current energy converter using a vertical axis turbine mounted on a permanent magnet synchronous generator. The purpose of this thesis is to show the work done in the so far relatively uncharted territory of control systems for hydro kinetic energy conversion. The work is in its early stage and is meant to serve as a guide forfuture development of the control system. An experimental power station has been deployed and the first results are presented. A comparison between three load control methods has been made; a fixedAC load, a fixed pulse width modulated DC load and a DC bus voltage control of a DC load. Experimental results show that the DC bus voltage control reduces the variation of rotational speed with a factor of 3.5. For all three cases, the tip speed ratio of the turbine can be kept close to the expected optimal tip speed ratio. However, for all three cases the average extracted power was significantly lower than the average power available in the turbine times the estimated maximum power coefficient. A maximum power point tracking system, with or without water velocity measurement, should increase the average extracted power. A simulation model has been validated using experimental data. The simulated system consists of the electrical system and a hydrodynamic vortex model for the turbine. Experiments of no load operation were conducted to calibrate the drag losses of the turbine. Simulations were able to predict the behaviour in a step response for a change in tip speed ratio when the turbine was operated close to optimal tip speed ratio. The start position of the turbine was varied in the simulation to view the influence on the step response from a changed turbine position relative to the direction of the water flow.<br><p>Funders: J Gust Richert, Bixia Miljöfond</p>

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Felicetti, Roberto. "Field Current Control for the Damping of Rotor Oscillations and for the Alternative Start of Synchronous Machines : Further Innovative Applications of Field Current Active Control besides UMP-Compensation." Thesis, Uppsala universitet, Institutionen för teknikvetenskaper, 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-353669.

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The possibility to save energy in synchronous machines operation by dismissing d-axis damping bars and surrogating them with active excitation current control in sectored field winding is proved. In particular a way to recover the energy of rotor oscillations during power regulation is shown by means of a studycase generator whereas a self-starting machine is analytically and numerically designed in view of its next construction and test. Principal design requirements and limits for both applications are presented and discussed.

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Goude, Anders. "Fluid Mechanics of Vertical Axis Turbines : Simulations and Model Development." Doctoral thesis, Uppsala universitet, Elektricitetslära, 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-183794.

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Two computationally fast fluid mechanical models for vertical axis turbines are the streamtube and the vortex model. The streamtube model is the fastest, allowing three-dimensional modeling of the turbine, but lacks a proper time-dependent description of the flow through the turbine. The vortex model used is two-dimensional, but gives a more complete time-dependent description of the flow. Effects of a velocity profile and the inclusion of struts have been investigated with the streamtube model. Simulations with an inhomogeneous velocity profile predict that the power coefficient of a vertical axis turbine is relatively insensitive to the velocity profile. For the struts, structural mechanic loads have been computed and the calculations show that if turbines are designed for high flow velocities, additional struts are required, reducing the efficiency for lower flow velocities.Turbines in channels and turbine arrays have been studied with the vortex model. The channel study shows that smaller channels give higher power coefficients and convergence is obtained in fewer time steps. Simulations on a turbine array were performed on five turbines in a row and in a zigzag configuration, where better performance is predicted for the row configuration. The row configuration was extended to ten turbines and it has been shown that the turbine spacing needs to be increased if the misalignment in flow direction is large.A control system for the turbine with only the rotational velocity as input has been studied using the vortex model coupled with an electrical model. According to simulations, this system can obtain power coefficients close to the theoretical peak values. This control system study has been extended to a turbine farm. Individual control of each turbine has been compared to a less costly control system where all turbines are connected to a mutual DC bus through passive rectifiers. The individual control performs best for aerodynamically independent turbines, but for aerodynamically coupled turbines, the results show that a mutual DC bus can be a viable option.Finally, an implementation of the fast multipole method has been made on a graphics processing unit (GPU) and the performance gain from this platform is demonstrated.

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Das, Dibakar. "Control Strategies for Seamless Transition between Grid Connected and Islanded Modes in Microgrids." Thesis, 2017. http://etd.iisc.ac.in/handle/2005/3710.

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The popularity of distributed generating (DG) sources have been increasing over the past few years. With the increasing penetration of these DGs, the concept of micro grid is becoming popular. A micro grid is a small power system network with distributed generating sources which can operate seamlessly irrespective of the presence of the utility grid. Operating the micro grid in this manner increases system reliability and reduces power interruptions. However, it introduces several control challenges. This thesis aims at analysing the behaviour of a micro grid system during the transition between grid connected mode and islanded mode of operation and address the control challenges through novel schemes. With the presence of grid, the micro grid system variables, such as voltage and frequency, are strictly regulated by the grid. The local sources follow the voltage and frequency reference set by the grid and supply constant power. With the loss of grid, that is when the system is islanded, the network variables need to be regulated by the local sources. The control structures for the inverter-based sources during the two operating modes are detailed in the present work. With the loss of grid, the system should be able to transfer seamlessly to islanded mode without any transients. Similarly, when the grid supply is restored, the micro grid should seamlessly resynchronize to the grid without any transients. This thesis proposes two novel controller schemes for achieving seamless transfer between grid-connected and islanded mode in micro grids. The rst scheme uses an output feedback topology to reduce the transitions during mode transfer. The second scheme uses a Linear Quadratic Regulator (LQR) theory based compensator to achieve seamless transfer. The performance of the proposed schemes have been validated through simulations on a benchmark micro grid network for various operating conditions. An experimental micro grid set-up is developed with a single inverter based DG source. The droop control scheme for islanded mode of operation has been validated on hardware.

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Das, Dibakar. "Control Strategies for Seamless Transition between Grid Connected and Islanded Modes in Microgrids." Thesis, 2017. http://etd.iisc.ernet.in/2005/3710.

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The popularity of distributed generating (DG) sources have been increasing over the past few years. With the increasing penetration of these DGs, the concept of micro grid is becoming popular. A micro grid is a small power system network with distributed generating sources which can operate seamlessly irrespective of the presence of the utility grid. Operating the micro grid in this manner increases system reliability and reduces power interruptions. However, it introduces several control challenges. This thesis aims at analysing the behaviour of a micro grid system during the transition between grid connected mode and islanded mode of operation and address the control challenges through novel schemes. With the presence of grid, the micro grid system variables, such as voltage and frequency, are strictly regulated by the grid. The local sources follow the voltage and frequency reference set by the grid and supply constant power. With the loss of grid, that is when the system is islanded, the network variables need to be regulated by the local sources. The control structures for the inverter-based sources during the two operating modes are detailed in the present work. With the loss of grid, the system should be able to transfer seamlessly to islanded mode without any transients. Similarly, when the grid supply is restored, the micro grid should seamlessly resynchronize to the grid without any transients. This thesis proposes two novel controller schemes for achieving seamless transfer between grid-connected and islanded mode in micro grids. The rst scheme uses an output feedback topology to reduce the transitions during mode transfer. The second scheme uses a Linear Quadratic Regulator (LQR) theory based compensator to achieve seamless transfer. The performance of the proposed schemes have been validated through simulations on a benchmark micro grid network for various operating conditions. An experimental micro grid set-up is developed with a single inverter based DG source. The droop control scheme for islanded mode of operation has been validated on hardware.

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LAN, SHIN-TUNG, and 藍士統. "Maximum torque and constant current in iductive axis control with current sensorless variable structure of synchronous reluctance motor." Thesis, 2008. http://ndltd.ncl.edu.tw/handle/28086258677331657181.

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碩士<br>雲林科技大學<br>電機工程系碩士班<br>96<br>A synchronous reluctance motor driven by an integral variable structure controller for current sensorless is presented. We adopt maximum torque control (MTC) and constant current in inductive axis control (CCIAC) strategies to overcome the drawback of operation in low speed using MTC strategy. The integral variable structure controller is used to reject the uncertain bounded disturbances and parameter variations. The current reference equation generates the require current from the voltage equation and the motor speed. Simulation results show that the proposed controller has a fast response and a good disturbance rejection capability.

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Shields, Bradley. "Two-axis torque control of BLDC motors for electric vehicle applications." Thesis, 2014. http://hdl.handle.net/10413/11375.

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This thesis begins with a literature review focusing on electric vehicle (EV) applications. Systems used for steering, braking and energy storage are investigated, with specific concentration on torque control in various DC and AC motors commonly used in EVs. A final solution for a low range personal transportation EV in the form of a wheelchair is proposed. The theme for this thesis is motion control, focusing on a two axis (or two wheel drive) brushless DC hub motor (BLDCHM) EV, with torque and direction control tracking a user reference. The operation principle for a BLDCHM is documented and the dynamic and electrical equations derived. Simulation results for motor response under different load and speed conditions are compared to practical measurements. Current and torque control loops are designed, implemented and tuned on a single-axis test-bed with an induction motor (IM) load coupled via a torque transducer. A Texas Instrument DSP development kit is used for the control algorithm bench testing. The final control algorithm is then duplicated and expanded in simulation to form a dynamic two axis system for an electric wheelchair. It incorporates both motor drive and regenerative capabilities. After demonstrating two axis controls for BLDCHMs, a control algorithm is designed simulated and compared to traditional systems. The final solution focuses specifically on an intuitive response to the driver input whilst maintaining direction tracking, even when there is a difference in smoothness of the individual terrains traversed by the left and right wheels. In addition the motor drives are equipped with controllers that ensure regenerative braking in order to recover as much energy as possible when the wheelchair is commanded to decelerate.<br>M. Sc. Eng. University of KwaZulu-Natal, Durban 2014.

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Books on the topic "DQ axis current control"

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Cellek, Selim. Mechanism of penile erection. Edited by David John Ralph. Oxford University Press, 2017. http://dx.doi.org/10.1093/med/9780199659579.003.0101.

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Sexual stimuli (tactile, visual, olfactory, and imaginative) are processed and integrated in the central nervous system which then activates certain autonomic and somatic pathways within the peripheral nervous system. This coordinated activation of the central and peripheral nervous systems leads to penile erection which is actually a result of relaxation of vascular and cavernosal smooth muscle in the penis. In the flaccid (detumescent) penis, the smooth muscle tone is heightened. Penile erection (tumescence) requires a decrease in the smooth muscle tone. The tone of the penile smooth muscle therefore is the main determinant of erectile function. In this chapter, the current information on the control of erectile function by this central-peripheral-smooth muscle axis will be reviewed.

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Book chapters on the topic "DQ axis current control"

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You, Zhou, Yongming Bian, Zhangjie Ding, and Li Chen. "A Study on Weighting Factors in Cost Function of Model Predictive Control Algorithms." In Lecture Notes in Mechanical Engineering. Springer Nature Singapore, 2024. http://dx.doi.org/10.1007/978-981-97-1876-4_38.

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AbstractWith the growing emphasis on environmental protection, the engineering construction industry is facing new demands. The widespread electrification of construction machinery has emerged as an inevitable trend. To align with this trend, this paper conducts research on the model predictive control algorithm (MPC) applied to permanent magnet synchronous motors (PMSM). The MPC algorithm primarily consists of the motor’s mathematical model and the cost function. This study focuses on analyzing the weight factor within the cost function. The spectrum of weight factor combinations concerning the dq-axis current is formulated across a broad range of intervals. The algorithm’s performance is assessed under various weight factors using experimental data from three-phase current operation, motor torque, rotational speed, and other parameters. Ultimately, a novel evaluation function is proposed in this study to quantitatively assess the algorithm’s performance across various combinations. The process involves identifying the optimal combination of weight factors for the cost function. This effort contributes significantly to establishing a robust groundwork for the general electrification of construction machinery.

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Singh, Deepak Kumar, Saibal Manna, and Ashok Kumar Akella. "Control of Three-Phase Grid-Connected Inverter Using dq Axis Theory." In Recent Advances in Power Electronics and Drives. Springer Nature Singapore, 2022. http://dx.doi.org/10.1007/978-981-16-9239-0_13.

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Purohit, Pranati Rani, Arnab Ghosh, and Pravat Kumar Ray. "DQ current control strategies for single-phase grid-connected inverter." In Next-Generation Artificial Intelligence Driven Smart and Renewable Energy. CRC Press, 2025. https://doi.org/10.1201/9781003628279-10.

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Liu, Sihan, Wei Sun, and Ronghai Qu. "A D-Axis Current Reference Compensation Method for Sensorless Control of Induction Motors Under Virtual Voltage Injection Based on Neural Networks." In Lecture Notes in Electrical Engineering. Springer Nature Singapore, 2025. https://doi.org/10.1007/978-981-96-4856-6_11.

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Abstract Sensorless control technology for induction motors has been widely applied in various industrial scenarios due to its advantages of low cost and high reliability. However, significant instability can occur in the low-speed generation region. Traditional signal injection methods are not suitable for induction motors with weak anisotropy and may cause torque ripple issues. The virtual voltage injection method can fundamentally resolve the instability in sensorless control of induction motors in the low synchronous speed region without causing torque ripple problems. Nevertheless, this approach also increases the required d-axis current reference for motor control, leading to higher no-load and light-load losses. To address this issue, this paper integrates artificial intelligence algorithms to construct and train a torque estimation network for induction motor sensorless control under virtual voltage injection. Based on the estimated torque from the network, the d-axis current reference is compensated accordingly, allowing it to adapt to load variations, thereby reducing no-load and light-load losses.

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Wang, Yinzhen, Jiangping Liu, and Liyun Zhuo. "Research on Irregular-Shaped Workpiece Fixture Based on Electrorheological Fluid." In Lecture Notes in Mechanical Engineering. Springer Nature Singapore, 2025. https://doi.org/10.1007/978-981-97-7887-4_108.

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Abstract Although the current computer numerical control (CNC) machine tools on the market are flexible, efficient, and automated, capable of enhancing precision, handling large quantities of components, and processing diverse ordinary parts, they often encounter challenges in positioning, clamping, and stress concentration when fabricating special-shaped structures. In response to these issues, multiple sets of specialized fixtures are usually designed and manufactured according to requirements, which increases the processing cost of irregular-shaped workpieces. Moreover, these specialized fixtures cannot be universally applied, leading to substantial wastage. Therefore, this project utilizes the inherent transformation characteristics of electrorheological (ER) fluid between liquid and solid to achieve rapid automatic clamping. The clamping is fully enveloping, ensuring stable clamping force and minimizing damage to irregular-shaped workpieces. Simultaneously, by combining multi-axis attitude adjustment arms with multiple sets of laser positioning, flexible and precise adjustment of the attitude of irregular-shaped workpieces is achieved. Ultimately, the combination of ER fluid enables the clamping and positioning of any irregular-shaped workpiece.

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Wang, Han, Fan Zhang, and Yuanjie Ren. "Research on Speed Control Strategy of Asynchronous Motor in Marine Electric Propulsion System." In Fuzzy Systems and Data Mining IX. IOS Press, 2023. http://dx.doi.org/10.3233/faia231081.

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With the widespread application of new technologies and new equipment, due to the differences between ship power systems and land power systems, it is necessary to model and digitally simulate the ship electric propulsion system. This paper establishes a mathematical model of the ship’s electric propulsion system, and uses Matlab to initially implement digital simulation of the system. The simulation adopts a hierarchical structure and modular design. Based on the slip frequency speed regulation control strategy, the motor speed, electromagnetic torque, three-phase current and dq-axis current of the asynchronous motor starting process and loading process are simulated and analyzed. Under two common working conditions, the speed change curve was simulated and verified using the slip frequency speed regulation control strategy and without using the control strategy. The examples proved the correctness of the simulation model and method.

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Lozovska, Anastasiia, Artemis G. Korovesi, Patricia Duarte, Ana Casaca, Tereza Assunção, and Moises Mallo. "The control of transitions along the main body axis." In Current Topics in Developmental Biology. Elsevier, 2023. http://dx.doi.org/10.1016/bs.ctdb.2023.11.002.

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Pan, Zijun, and Huiying Chen. "Field-Oriented Control of Stepper Motor with Model Predictive Current Control." In Advances in Transdisciplinary Engineering. IOS Press, 2023. http://dx.doi.org/10.3233/atde230268.

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Hybrid stepper motors (HSMs) have a wide range of applications. However, conventional open-loop control is difficult to meet the demand for higher accuracy. The development of control theory and electronic technology makes the application of advanced control techniques possible, including model predictive control (MPC). In this paper, a stepper motor current loop predictive model has been constructed, and then the design of q-axis current regulator has been implemented by feedback correction and rolling optimization, which has been applied to the field-oriented control (FOC) of stepper motor and verified by simulation and experiments. The results indicate that the MPC regulator in this paper has good regulation effect and reduces the q-axis current ripples to a certain extent in the series control, which finally improves the control performance.

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Bao, Yiqin, Wenbin Xu, and Yulu Bao. "Design and Research of Four-Axis Aircraft Control System Based on STM32F411." In Frontiers in Artificial Intelligence and Applications. IOS Press, 2024. https://doi.org/10.3233/faia241454.

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Four-axis aircraft is a type of aircraft with a simple structure and versatile applications. Compared to traditional fixed wing aircraft, four-Axis Aircraft have higher flexibility and can achieve takeoff, landing, hovering, and more precise aerial operations in different terrains. This article designs a four-Axis aircraft control system based on STM32F411, introduces the current research status of four-axis aircraft, the basic architecture and control principles of four-axis aircraft, provides a method for controlling the flight attitude of four-axis aircraft on the STM32F411 microprocessor platform, and analyzes and studies the algorithms and mathematical principles used in the control system.

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Gupta, Ena, Sanket Kaushik, Vijay Kumar Srivastava, Juhi Saxena, and Anupam Jyoti. "Real-Time PCR High-Resolution Melting Analysis." In Current Developments in the Detection and Control of Multi Drug Resistance. BENTHAM SCIENCE PUBLISHERS, 2022. http://dx.doi.org/10.2174/9789815049879122010008.

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High Resolution Melting (HRM) is a homogeneous, exceptionally incredible innovation for single nucleotide polymorphism (SNP) genotyping, mutation scanning and sequence scanning in DNA samples. HRM analysis works on the principle of melting (dissociation) curve methodologies of Polymerase Chain Reaction (PCR) empowered by the new accessibility of improved double-stranded DNA (dsDNA)–binding dyes and next-generation real-time PCR instrumentation. The HRM technology portrays samples of nucleic acids on the basis of their disassociation behaviors and identifies the differences in even the short sequence in amplified PCR products, just by direct melting. Samples are further distinguished according to the length of their sequence, GC content and strand complementarity. Indeed, even a single change in the base pair in the sequences of DNA samples causes differences in the HRM curve. The difference in the melting curves of different genetic sequences at distinct rates can be observed, detected and compared using these curves. Development of the melting curves after HRM analysis is basically plotted with temperature on the X axis and fluorescence on the Y axis, which resembles the real-time PCR amplification curve but with the difference of temperature for cycle number. With the use of different DNA dyes, high-end instrumentation and sophisticated analysis software, these distinctions are detected.

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Conference papers on the topic "DQ axis current control"

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Zhang, Chenkai, Yiqing Liu, Di Yan, Qingxiu Du, Yuanjian Wei, and Qichao Xu. "Dq-axis Current Based Protection Principle for Modular Multilevel Converters." In 2024 IEEE International Conference on Electrical Energy Conversion Systems and Control（IEECSC）. IEEE, 2024. https://doi.org/10.1109/ieecsc62814.2024.10913708.

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Hasegawa, Ryuhei, Keiichiro Kondo, Chikako Funayama, and Akihiro Imura. "Characteristics of Battery-Internal-Heating Method Involving Dq-Axis Current Pulsation in Permanent Magnet Synchronous Motors During Electric Vehicle Operation." In 2024 IEEE International Conference on Electrical Systems for Aircraft, Railway, Ship Propulsion and Road Vehicles & International Transportation Electrification Conference (ESARS-ITEC). IEEE, 2024. https://doi.org/10.1109/esars-itec60450.2024.10819775.

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Iyer, Vaishnavvignesh G., Cilaveni Satish Chandra, Ravindranath Adda, and Sreenath J. G. "Inductor Current Feed-Forward Based Single-Loop DQ Control Scheme for Standalone Inverter System." In 2024 IEEE International Conference on Power Electronics, Drives and Energy Systems (PEDES). IEEE, 2024. https://doi.org/10.1109/pedes61459.2024.10960964.

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Wu, Tasi-Fu, Chien-Chih Hung, Jui-Yang Chiu, and Tzu-Chieh Chen. "Improved Grid Current with dq-Based Control and Capacitor Current Compensation for Three-phase Three-wire Inverter with LCL Filter under Grid Voltage Distortion." In 2025 IEEE Industry Applications Society Annual Meeting (IAS). IEEE, 2025. https://doi.org/10.1109/ias62731.2025.11061647.

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E, Fayyaz, Nikhil Sasidharan, and Suchithra K S. "Comparative Analysis of Three PI Tuning Methods for Speed and D-Q Axis Current Controllers in PMSM Speed Control Using FOC." In 2024 4th International Conference on Emerging Frontiers in Electrical and Electronic Technologies (ICEFEET). IEEE, 2024. https://doi.org/10.1109/icefeet64463.2024.10866858.

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Yamamori, Yuto, Yuki Miki, Mutuwo Tomita, Masaru Hasegawa, and Shinji Doki. "Effects of d-Axis Inductance Change for Position Sensorless Control of SynRM at Low Velocities by Using an Extended EMF Caused by High-Frequency Current Superposition." In 2024 27th International Conference on Electrical Machines and Systems (ICEMS). IEEE, 2024. https://doi.org/10.23919/icems60997.2024.10921149.

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Yang, Rui, Mingyi Wang, Jialin Jiang, Yujie Niu, and Liyi Li. "Decoupled $dq$-axis Current Control for PMLSM based on Variable-Gain Adaptive Internal Model." In 2018 IEEE Energy Conversion Congress and Exposition (ECCE). IEEE, 2018. http://dx.doi.org/10.1109/ecce.2018.8558221.

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Takeuchi, Takuma, and Shinji Doki. "Current Vector Control System Based on a New Discrete dq-Axis IM Model for High Speed Drive." In 2022 International Power Electronics Conference (IPEC-Himeji 2022- ECCE Asia). IEEE, 2022. http://dx.doi.org/10.23919/ipec-himeji2022-ecce53331.2022.9807157.

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Sun, Yarong, Mingyao Ma, Feng Ling, Hongyu Long, Fei Li, and Xing Zhang. "Fault Chain Diagnostic Method Based on Virtual Characteristic Quantity of dq-axis Currents for PV Grid-Connected Inverters." In 2020 IEEE 9th International Power Electronics and Motion Control Conference (IPEMC2020-ECCE Asia). IEEE, 2020. http://dx.doi.org/10.1109/ipemc-ecceasia48364.2020.9367630.

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Alsaleh, Ibrahim, and Lingling Fan. "DQ-axis current-based droop controller." In 2017 North American Power Symposium (NAPS). IEEE, 2017. http://dx.doi.org/10.1109/naps.2017.8107382.

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