Relevant bibliographies by topics / Homopolar radial magnetic bearing

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  1. Journal articles
  2. Dissertations / Theses
  3. Books
  4. Book chapters
  5. Conference papers

Academic literature on the topic 'Homopolar radial magnetic bearing'

Author: Grafiati
Published: 4 June 2021
Last updated: 2 February 2022

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Journal articles on the topic "Homopolar radial magnetic bearing"

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Kasarda, M. E. F., P. E. Allaire, P. M. Norris, C. Mastrangelo, and E. H. Maslen. "Experimentally Determined Rotor Power Losses in Homopolar and Heteropolar Magnetic Bearings." Journal of Engineering for Gas Turbines and Power 121, no. 4 (October 1, 1999): 697–702. http://dx.doi.org/10.1115/1.2818529.

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The identification of parameters that dictate the magnitude of rotor power losses in radial magnetic bearings is very important for many applications. Low loss performance of magnetic bearings in aerospace equipment such as jet engines and flywheel energy storage systems is especially critical. Two basic magnetic bearing designs are employed in industrial practice today: the homopolar design, where the flux paths are of a mixed radial/axial orientation, and the heteropolar design, where the flux paths are primarily radial in nature. The stator geometry and flux path of a specific bearing can have a significant effect on the rotor losses. This paper describes the detailed measurement of rotor losses for experimentally comparable homopolar and heteropolar designs. The two test bearing configurations are identical except for geometric features that determine the direction of the flux path. Both test bearing designs have the same air gap length, tip clearance ratio, surface area under the poles, and bias flux levels. An experimental test apparatus was used where run down tests were performed on a test rotor with both bearing designs to measure power losses. Numerous test runs where made for each bearing configuration by running multiple levels of flux density. The components of the overall measured power loss, due to hysteresis, eddy currents, and windage, were determined based on theoretical expressions for power loss. It was found that the homopolar bearing had significantly lower power losses than the heteropolar bearing.
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Kenny, Andrew, and Alan B. Palazzolo. "Single Plane Radial, Magnetic Bearings Biased With Poles Containing Permanent Magnets." Journal of Mechanical Design 125, no. 1 (March 1, 2003): 178–85. http://dx.doi.org/10.1115/1.1541630.

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Magnetic bearings biased with permanent magnets have lower coil resistance power losses, and the magnets can also be used to help support a constant side load. In this paper, the performance of a single plane radial magnetic bearing biased with permanent magnets in several poles is presented. Although it has less load capacity and stiffness than a similarly sized electrically biased single plane heteropolar bearing, it does not require bias current, and its ratio of load capacity to coil resistance power loss is significantly better. This type of permanent magnet bearing has only a single plane of poles. It can be distinguished from the homopolar bearing type which has two planes and which can also be biased with permanent magnets. Magnetic circuit models for the novel single plane bearing are presented along with verification by finite element models. Equations for the key performance parameters of load capacity, stiffness, coil inductance and resistive power loss are also presented.
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Kurnyta-Mazurek, Paulina, Artur Kurnyta, and Maciej Henzel. "Measurement System of a Magnetic Suspension System for a Jet Engine Rotor." Sensors 20, no. 3 (February 6, 2020): 862. http://dx.doi.org/10.3390/s20030862.

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This paper presents laboratory results on the measurement system of a magnetic suspension bearing system for a jet engine rotor of an unmanned aerial vehicle (UAV). Magnetic suspension technology enables continuous diagnostics of a rotary machine and eliminates of the negative properties of classical bearings. This rotor-bearing system consists of two radial magnetic bearings and one axial (thrust) magnetic bearing. The concept of the bearing system with a magnetically suspended rotor for UAV is presented in this paper. Rotor geometric and inertial characteristics were assumed according to the parameters of a TS-21 jet engine. Preliminary studies of the measurement system of rotor engines were made on a laboratory stand with homopolar active magnetic bearings. The measurement system consisted of strain gauges, accelerometers, and contactless proximity sensors. During the research, strains were registered with the use of a wireless data acquisition (DAQ) system. Measurements were performed for different operational parameters of rotational rotor speed, control system parameters, and with the presence of disturbance signals from the control system. In this paper, obtained operational characteristics are presented and discussed.
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Yin, Shengjing, Fengxiao Huang, Yukun Sun, Ye Yuan, Yonghong Huang, and Chi Chen. "OPTIMUM DESIGN OF HOMOPOLAR RADIAL TWO-DEGREE-OF-FREEDOM HYBRID MAGNETIC BEARING." Progress In Electromagnetics Research M 84 (2019): 31–41. http://dx.doi.org/10.2528/pierm19061701.

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Jiancheng, Fang, Wang Xi, Wei Tong, Tang Enqiong, and Fan Yahong. "Homopolar 2-Pole Radial Permanent-Magnet Biased Magnetic Bearing With Low Rotating Loss." IEEE Transactions on Magnetics 48, no. 8 (August 2012): 2293–303. http://dx.doi.org/10.1109/tmag.2012.2192131.

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Eagleton, Robert D., and Martin N. Kaplan. "The radial magnetic field homopolar motor." American Journal of Physics 56, no. 9 (September 1988): 858–59. http://dx.doi.org/10.1119/1.15448.

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Kenny, A., A. Palazzolo, G. T. Montague, and A. F. Kascak. "Theory and Test Correlation for Laminate Stacking Factor Effect on Homopolar Bearing Stiffness." Journal of Engineering for Gas Turbines and Power 126, no. 1 (January 1, 2004): 142–46. http://dx.doi.org/10.1115/1.1615258.

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The effect of the laminate stacking factor on homopolar magnetic bearing performance is examined. Stacked laminates are used on the bearing rotor and in the stator. These laminate stacks have anisotropic permeability. Equations for the effect of the stacking factor on homopolar bearing position stiffness are derived. Numerical results are calculated and compared to measurements. These results provide an answer for the common discrepancy between test and theory for homopolar magnetic bearing position stiffnesses.
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Ren, Xiaojun, Jinji Sun, and Cunxiao Miao. "DYNAMICS AND STIFFNESS ANALYSIS OF A HOMOPOLAR MAGNETIC BEARING." Progress In Electromagnetics Research M 77 (2019): 29–40. http://dx.doi.org/10.2528/pierm18091503.

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Kang, Kyungdae, and Alan Palazzolo. "Homopolar Magnetic Bearing Saturation Effects on Rotating Machinery Vibration." IEEE Transactions on Magnetics 48, no. 6 (June 2012): 1984–94. http://dx.doi.org/10.1109/tmag.2012.2182776.

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Cao, Yu, Chuang Liu, Shushu Zhu, and Junyue Yu. "TEMPERATURE FIELD ANALYSIS AND OPTIMIZATION OF THE HOMOPOLAR MAGNETIC BEARING." Progress In Electromagnetics Research M 85 (2019): 105–14. http://dx.doi.org/10.2528/pierm19072801.

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Dissertations / Theses on the topic "Homopolar radial magnetic bearing"

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Hossain, Mohammad Ahsan. "High temperature, permanent magnet biased, homopolar magnetic bearing actuator." Thesis, Texas A&M University, 2006. http://hdl.handle.net/1969.1/4174.

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The EEC (Electron Energy Corporation) in conjunction with the National Aeronautics and Space Administration is researching the magnetic bearings for an alternative to conventional journal or ball bearings. The purpose of this research was to design and develop a high-temperature (1000ºF) hybrid Magnetic Bearing using High Temperature Permanent Magnets (HTPM), developed by the EEC for high performance jet engines at high speeds that supply loads of 500 lbf. Another objective is to design and build a test rig fixture to measure the load capacity of the designed bearing. The permanent magnet bias of the Homopolar radial magnetic bearing reduces the amount of current required for magnetic bearing operation. This reduces the power loss due to the coil current resistance and improves the system efficiency because the magnetic field of the HTPM can suspend the major portion of the static load on bearing. A high temperature radial magnetic bearing was designed via an iterative search employing 3D finite element based electromagnetic field simulations. The bearing was designed to produce 500 lbf of force at 1000ºF and the design weight is 48 lbs. The bias flux of the Homopolar radial bearing is produced by EEC HTPM to reduce the related ohmic losses of an electromagnetic circuit significantly. An experimental procedure was developed to measure actual load capacity of the designed bearing at the test rig. All the results obtained from the experiment were compiled and analyzed to determine the relation between bearing force, applied current and temperature.
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Wiesenborn, Robert Kyle. "Circular sensor array and nonlinear analysis of homopolar magnetic bearings." Texas A&M University, 2006. http://hdl.handle.net/1969.1/4783.

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Magnetic bearings use variable attractive forces generated by electromagnetic control coils to support rotating shafts with low friction and no material wear while providing variable stiffness and damping. Rotor deflections are stabilized by position feedback control along two axes using non-contacting displacement sensors. These sensor signals contain sensor runout error which can be represented by a Fourier series composed of harmonics of the spin frequency. While many methods have been proposed to compensate for these runout harmonics, most are computationally intensive and can destabilize the feedback loop. One attractive alternative is to increase the number of displacement sensors and map individual probe voltages to the two independent control signals. This approach is implemented using a circular sensor array and single weighting gain matrix in the present work. Analysis and simulations show that this method eliminates runout harmonics from 2 to n-2 when all sensors in an ideal n-sensor array are operational. Sensor failures result in reduced synchronous amplitude and increased harmonic amplitudes after failure. These amplitudes are predicted using derived expressions and synchronous measurement error can be corrected using an adjustment factor for single failures. A prototype 8-sensor array shows substantial runout reduction and bandwidth and sensitivity comparable to commercial systems. Nonlinear behavior in homopolar magnetic bearings is caused primarily by the quadratic relationship between coil currents and magnetic support forces. Governing equations for a permanent magnet biased homopolar magnetic bearing are derived using magnetic circuit equations and linearized using voltage and position stiffness terms. Nonlinear hardening and softening spring behavior is achieved by varying proportional control gain and frequency response is determined for one case using numerical integration and a shooting algorithm. Maximum amplitudes and phase reversal for this nonlinear system occur at lower frequencies than the linearized system. Rotor oscillations exhibit amplitude jumps by cyclic fold bifurcations, creating a region of hysteresis where multiple stable equilibrium states exist. One of these equilibrium states contains subharmonic frequency components resulting in quasiperiodic rotor motion. This nonlinear analysis shows how nonlinear rotor oscillations can be avoided for a wide range of operation by careful selection of design parameters and operating conditions.
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Li, Ming-Hsiu. "Fault tolerant control of homopolar magnetic bearings and circular sensor arrays." Texas A&M University, 2004. http://hdl.handle.net/1969.1/3283.

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Fault tolerant control can accommodate the component faults in a control system such as sensors, actuators, plants, etc. This dissertation presents two fault tolerant control schemes to accommodate the failures of power amplifiers and sensors in a magnetic suspension system. The homopolar magnetic bearings are biased by permanent magnets to reduce the energy consumption. One control scheme is to adjust system parameters by swapping current distribution matrices for magnetic bearings and weighting gain matrices for sensor arrays, but maintain the MIMO-based control law invariant before and after the faults. Current distribution matrices are evaluated based on the set of poles (power amplifier plus coil) that have failed and the requirements for uncoupled force/voltage control, linearity, and specified force/voltage gains to be unaffected by the failure. Weighting gain matrices are evaluated based on the set of sensors that have failed and the requirements for uncoupling x1 and x2 sensing, runout reduction, and voltage/displacement gains to be unaffected by the failure. The other control scheme is to adjust the feedback gains on-line or off-line, but the current distribution matrices are invariant before and after the faults. Simulation results have demonstrated the fault tolerant operation by these two control schemes.
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Nel, Johannes Daniel. "The development of a radial active magnetic bearing / J.D. Nel." Thesis, North-West University, 2004. http://hdl.handle.net/10394/542.

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This dissertation presents the development of a radial active magnetic bearing (AMB). With AMBs the rotor of a machine can be suspended in the air without any direct contact between the stator and the rotor. This makes it a frictionless bearing and eliminates the need for lubrication. The AMB system implements a feedback control system to control the position of the rotor. The aim of this project is to develop a radial AMB with an air gap of 1 mm and a rotation speed of 3000 rpm. Through this project basic knowledge of magnetic suspension is gained and expertise is established at the Engineering Faculty. The model can be used for further studies and as a demonstration model to illustrate the concept of AMBs. The model constitutes one radial AMB and one conventional ball bearing supporting a rigid shaft. The AMB system constitutes 1) electromagnets, 2) power amplifiers, 3) position sensors and 4) a control system. Inductive sensors measure the air gap between the shaft and the stator in the vertical and horizontal axis. The sensor signal is fed back to a controller that provides a control signal to the power amplifiers. The power amplifiers control the current through the electromagnets that apply a force on the shaft. The shaft is then suspended in the air. An air pressure turbine is used to propel the shaft up to 3000 rpm. A homopolar AMB configuration is implemented using mild steel for the electromagnets. The four electromagnets used in the system are designed in terms of a required force. Linear power amplifiers are designed to activate the electromagnets and to eliminate possible noise problems on the sensors. Inductive position sensors are implemented producing a dc voltage proportional to the size of the air gap. dSpace® software is used to implement the controller. A position sensor value is read in through an analog-to-digital converter channel and subtracted from a reference signal for the position. The error signal is then the input of the controller. The controller sends a control signal via the digital-to- analog converter to the power amplifiers. A PID controller is created in sirnulink®. With the aid of dSpace® software the controller is downloaded onto the dSpace card. Different tests are performed to characterise the system. The step responses in both axes are measured and the percentage overshoots and settling times are determined. Impulse disturbance tests at different speeds are used to calculate the dynamic stiffness and damping of the system. Stable suspension was achieved with the final AMB system at rotation speeds of 3000 rpm. The maximum deviation was found to be less than 0.11 mm from the centre position. The settling time was less than 0.4 s and with no steady state error. The developed AMB system has a relatively low dynamic stiffness. Future studies can be done to find the effect that each PID parameter has on the dynamic stiffness. It is recommended that the controller be implemented on an embedded microcontroller to eliminate the computer and the dSpace® card.
Thesis (M.Ing. (Electrical and Electronic Engineering))--North-West University, Potchefstroom Campus, 2005.
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Pazdera, Ivo. "Průmyslové čerpadlo s integrovaným elektromagnetickým systémem." Doctoral thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2013. http://www.nusl.cz/ntk/nusl-233600.

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This work is focused on innovative construction of the industrial radial sealless pump and mainly on construction of the three phase DC/AC converter based on new semiconductor technology SiC. These new semiconductor devices allow move switching frequency up to 100 kHz. For such high switching frequency new non-conventional topology of the output filter was designed. This high frequency is currently unusual in three-phase application with output voltage 400V. High switching frequency reduces size of wound components of the output filter and its presence is accepted in terms of total weight and price of the whole system. Clear sinus waveform of the output converter voltage reduces torque ripple, EMC and extend the lifetime and reliability of mechanical parts and the whole pump drive. Three phase synchronous motor is directly placed into the pump body and is designed as slotless motor. In the inlet area is the classical bearing replaced by active magnetic bearing. It is used due to possibility to pump aggressive liquids or substances where high level of cleanness has to be guaranteed.
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Gandhi, Varun R. "High Temperature, Permanent Magnet Biased Magnetic Bearings." 2009. http://hdl.handle.net/1969.1/ETD-TAMU-2009-05-276.

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The Electron Energy Corporation (EEC) along with the National Aeronautics and Space Administration (NASA) is researching magnetic bearings. The purpose of this research was to design and develop a high-temperature (1000�F) magnetic bearing system using High Temperature Permanent Magnets (HTPM), developed by the EEC. The entire system consisted of two radial bearings, one thrust bearing, one motor and 2 sets of catcher bearings. This high temperature magnetic bearing system will be used in high performance, high speed and high temperature applications like space vehicles, jet engines and deep sea equipment. The bearing system had a target design to carry a load equal to 500 lb-f (2225N). Another objective was to design and build a test rig fixture to measure the load capacity of the designed high temperature radial magnetic bearing (HTRMB) called Radial Bearing Force Test Rig (RBFTR). A novel feature of this high temperature magnetic bearing is its homopolar construction which incorporates state of the art high temperature, 1000 �F, permanent magnets. A second feature is its fault tolerance capability which provides the desired control forces even if half the coils have failed. The permanent magnet bias of the radial magnetic bearing reduces the amount of current required for magnetic bearing operation. This reduces the power loss due to the coil current resistance and also increases the system efficiency because magnetic field of the HTPM is used to take up the major portion of the static load on the bearing. The bias flux of the homopolar radial bearing is produced by the EEC HTPM to reduce the related ohmic losses of an electromagnetic circuit significantly. An experimental procedure was developed using the Radial Bearing Force Test Rig (RBTFR) to measure actual load capacity of the designed bearing at the test rig. All the results obtained from the experiment were compiled and analyzed to determine the relation between bearing force, applied current and temperature.
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Wadhvani, Vishal Ashok. "Feedback Control of a Permanent Magnet Biased, Homopolar Magnetic Bearing System." Thesis, 2011. http://hdl.handle.net/1969.1/ETD-TAMU-2011-05-9477.

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Magnetic bearings are increasingly being used in a wide variety of applications in the industry such as compressors, turbines, motors, generators etc. Also, there are different types available depending upon their construction. The research presented here investigates a high temperature permanent magnet biased magnetic bearing system which is jointly being researched by National Aeronautics and Space Administration (NASA) and Electron Energy Corporation (EEC). The purpose of this research was to develop a permanent magnet biased magnetic bearing system using high temperature (HT) permanent magnets (PM) developed by EEC. This system was designed for high performance, high temperature (1000F) and high speed applications. The entire system consisted of two radial bearings, two catcher bearings, one axial thrust bearing and a motor. The central rotor shaft is powered by a high temperature permanent magnet motor to be able to run at the designed conditions of 20,000 rpm. This thesis documents the design of a feedback control law that stabilizes this HTPM biased AMB levitated system and summarizes efforts to build a test rig for the HT tests of the machine. A decentralized PD control law is used to achieve successful levitation. An existing PD analog controller with single input single output (SISO) control law for each axis (previously used for a flywheel test rig) is used as a feedback controller for this HTPM magnetic bearing system. Modeling and simulation of the resulting closed loop system is done in Matlab to test for stability and an iterative approach leads to optimum values of proportional and derivative gain pairs. The notch filter locations are also determined through this closed loop iterative simulation.
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Li, Yuan-Chen, and 李元辰. "Radial Active Magnetic Bearing System Design and Control." Thesis, 2014. http://ndltd.ncl.edu.tw/handle/12741084332167693045.

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碩士
大葉大學
電機工程學系
102
Due to the manufacturing process of products depend on high accuracy, requirement of high precision machining technology is becoming more and more important. For this reason, manufactory reduce rust in manufacturing process environment as much as possible. Therefore non-contact technology and some related technology have attracted more and more attention. 　　Magnetic levitation (Maglev) technology is the stable equilibrium of an object without contact and can be achieved using electric or magnetic forces. In this paper, we analyze the benefit of magnetic suspended system by magnetic levitation ball system. The radial active magnetic bearing (AMB) system was developed based on analysis of magnetic levitation ball system. This paper consists system test rig, electric circuit of position sensor, transfer equation of position sensor and electric circuit of power amplifier. Controller with PID control rule was applied to maglev ball and radial AMB system. We determined PID control parameters by Routh-Hurwitz stability criterion and wrote program with C++ language for these systems. 　　In this research, we solved control issue of magnetic levitation ball and built the radial AMB system. Finally, we used the maglev ball system and the radial AMB system test rig performing simulations and showing the experiment results.
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Yu, Shin-Shiung, and 尤信雄. "Optimal Fuzzy Control of Radial Active Magnetic Bearing Systems." Thesis, 2003. http://ndltd.ncl.edu.tw/handle/97015535311696230151.

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碩士
國立交通大學
電機與控制工程系
91
In this thesis, a neural-fuzzy approach to develop optimal control of a highly nonlinear radial current-controlled active magnetic bearing (AMB) systems is proposed. A linear self-constructing neural fuzzy inference network is proposed to modeling the radial current-controlled AMB system first. Then, the corresponding optimal fuzzy control design scheme is obtained to stabilize the AMB system with minimize current consumption. Simulation results show that the proposed optimal fuzzy controller can provide good performance and operate in widely range of shaft position.
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Liao, Xin-Wei, and 廖信瑋. "Radial passive magnetic bearing in ball bearings supporting rotor system applications." Thesis, 2014. http://ndltd.ncl.edu.tw/handle/yvcpxc.

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碩士
中原大學
機械工程研究所
102
Nowadays, magnetic systems have been applied in the industry systems widely due to the frictionless property of magnetic systems. Magnetic systems have two kinds: passive and active magnetic systems. Active magnetic systems use electronic magnet to control the subjects, such as rotors or platforms, by controlling the current to adjust the size of magnetic force. The advantage is the system stability can be confirm via tuning the magnetic force by the feedback signals, but the disadvantage is the magnetic system need additional control system and will consume the power. Passive magnetic systems use the permanent magnets to produce magnetic force. The advantage is it can be used a widely range, but the disadvantage is its magnetic force can’t be controlled, need to calculate the magnetic force. A passive magnetic bearing and a ball bearing are combined to form a hybrid bearing system in this paper. The passive magnetic bearing is used to increase the maximum radial load capacity and reduce the ball bearing load then promote the bearing life. The reasons we chosen a passive magnetic bearing are that the passive magnetic bearing system has no friction, does not need additional control, widely using environment and cheaper than the active magnetic bearing. The coordinate ball bearing is a deep groove ball bearing. The deep groove ball bearings are one of the most widely used ball bearings. Because the load capacity and life of the ball bearing are both lower than the steel ball bearing. This paper used a deep groove ball bearing with the inner radius is 10mm, the outer radius is 19mm, and the thickness is 10mm to be a test bearing. The experiment result showed that the proposed hybrid bearing can promote the bearing life. First, we calculated the radial force and axial force for the supporting system to determine the system specifications and capacity and the need of the supporting system. Then analyzed the relationship of forces and positions of the passive magnetic bearing according to the formula of the permanent magnet and to simulate the magnetic circuit with JMAG to choose a suitable set of permanent magnets to form a result with maximum radial force and minimum axial force. Finally, the passive magnetic bearing and the deep groove ball bearing are combined to test and confirm with the simulation results.
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Books on the topic "Homopolar radial magnetic bearing"

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Eliseo, DiRusso, Provenza A. J, and United States. National Aeronautics and Space Administration., eds. An active homopolar magnetic bearing with high temperature superconductor coils and ferromagnetic cores. [Washington, D.C.]: National Aeronautics and Space Administration, 1995.

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Eliseo, DiRusso, Provenza A. J, and United States. National Aeronautics and Space Administration., eds. An active homopolar magnetic bearing with high temperature superconductor coils and ferromagnetic cores. [Washington, D.C.]: National Aeronautics and Space Administration, 1995.

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Book chapters on the topic "Homopolar radial magnetic bearing"

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Betancor, Javier, M. Necip Sahinkaya, and Yahya H. Zweiri. "Radial Active Magnetic Bearing Design Optimization." In Mechanisms and Machine Science, 321–34. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-99262-4_23.

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Boden, Karl. "Wide-Gap, Electro-Permanentmagnetic Bearing System with Radial Transmission of Radial and Axial Forces." In Magnetic Bearings, 41–52. Berlin, Heidelberg: Springer Berlin Heidelberg, 1989. http://dx.doi.org/10.1007/978-3-642-51724-2_5.

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Fremerey, Johan K. "Radial Shear Force Permanent Magnet Bearing System with Zero-Power Axial Control and Passive Radial Damping." In Magnetic Bearings, 25–31. Berlin, Heidelberg: Springer Berlin Heidelberg, 1989. http://dx.doi.org/10.1007/978-3-642-51724-2_3.

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Shelke, Santosh N., and R. V. Chalam. "Optimum Power Loss in Eight Pole Radial Magnetic Bearing: Multi Objective Genetic Algorithm." In Communications in Computer and Information Science, 72–77. Berlin, Heidelberg: Springer Berlin Heidelberg, 2011. http://dx.doi.org/10.1007/978-3-642-25734-6_12.

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Zapoměl, Jaroslav, Petr Ferfecki, Jan Kozánek, Jan Košina, and Jan Cibulka. "Vibration of a Rigid Vertical Rotor Supported by a Shear Radial Magnetic Bearing." In Advances in Mechanism Design III, 183–90. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-83594-1_19.

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Conference papers on the topic "Homopolar radial magnetic bearing"

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Overstreet, Ross W., George T. Flowers, and Gyorgy Szasz. "Design and Testing of a Permanent Magnet Biased Active Magnetic Bearing." In ASME 1999 Design Engineering Technical Conferences. American Society of Mechanical Engineers, 1999. http://dx.doi.org/10.1115/detc99/vib-8282.

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Abstract Magnetic bearings provide rotor support without direct contact. There is a great deal of current interest in using magnetic bearings for active vibration control. Conventional designs use electrical current to provide the bias flux, which is an integral feature of most magnetic bearing control strategies. Permanent magnet biased systems are a relatively recent innovation in the field of magnetic bearings. The bias flux is supplied by permanent magnets (rather than electrically) allowing for significant decreases in resistance related energy losses. The use of permanent magnet biasing in homopolar designs results in a complex flux flow path, unlike conventional radial designs which are much simpler in this regard. In the current work, a design is developed for a homopolar permanent magnet biased magnetic bearing system. Specific features of the design and results from experimental testing are presented and discussed. Of particular interest is the issue of reduction of flux leakage and more efficient use of the permanent magnets.
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Kasarda, M. E. F., P. E. Allaire, P. M. Norris, C. Mastrangelo, and E. H. Maslen. "Experimentally Determined Rotor Power Losses in Homopolar and Heteropolar Magnetic Bearings." In ASME 1998 International Gas Turbine and Aeroengine Congress and Exhibition. American Society of Mechanical Engineers, 1998. http://dx.doi.org/10.1115/98-gt-317.

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The identification of parameters that dictate the magnitude of rotor power losses in radial magnetic bearings is very important for many applications. Low loss performance of magnetic bearings in aerospace equipment such as jet engines and flywheel energy storage systems is especially critical. Two basic magnetic bearing designs are employed in industrial practice today: the homopolar design, where the flux paths are of a mixed radial/axial orientation, and the heteropolar design, where the flux paths are primarily radial in nature. The stator geometry and flux path of a specific bearing can have a significant effect on the rotor losses. This paper describes the detailed measurement of rotor losses for experimentally comparable homopolar and heteropolar designs. The two test bearing configurations are identical except for geometric features that determine the direction of the flux path. Both test bearing designs have the same air gap length, tip clearance ratio, surface area under the poles, and bias flux levels. An experimental test apparatus was used where run down tests were performed on a test rotor with both bearing designs to measure power losses. Numerous test runs where made for each bearing configuration by running multiple levels of flux density. The components of the overall measured power loss, due to hysteresis, eddy currents, and windage, were determined based on theoretical expressions for power loss. It was found that the homopolar bearing had significantly lower power losses than the heteropolar bearing.
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Kim, Ha-Yong, and Seung-Jong Kim. "Design of a Combined Radial and Axial Magnetic Bearing." In ASME 2005 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. ASMEDC, 2005. http://dx.doi.org/10.1115/detc2005-85454.

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This paper proposes a new compact active magnetic bearing(AMB) that has both radial and axial control functions in one bearing unit, which enables the removal of the large disk unlike conventional axial AMBs. The proposed AMB consists of four U-shaped cores circumferentially connected by yokes and two-layer windings for radial and axial controls; one is configured like a homopolar AMB, and the other is the same as that of a 4-pole heteropolar AMB. Since each winding can be used for radial control, the proposed system has two kinds of operating principle according to the radial control type. As for axial control action, it uses the Lorentz force generated by the interaction of the bias flux for radial control and the axial control flux. In this paper, the proposed structure, principle, and design process based on the magnetic flux analysis are introduced, and its feasibility is experimentally verified by using a simple PD controller with a feedforward loop to compensate a coupled effect.
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4

Filatov, Alexei V., and Lawrence A. Hawkins. "Combination Axial and Radial Active Magnetic Bearing With Improved Axial Bandwidth." In ASME Turbo Expo 2012: Turbine Technical Conference and Exposition. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/gt2012-68645.

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Homopolar Permanent-Magnet-Biased Combination Axial and Radial Electromagnetic Actuators used in Active Magnetic Bearings (AMBs) have several advantages over arrangements of separate axial and radial actuators including shorter length, lower part count, lower cost and better rotordynamic response. However, these actuators may require higher-order compensators in applications with significant dynamic axial loads due to somewhat lower axial bandwidth. One of the reasons for a lower axial bandwidth is having the axial magnetic control flux flowing through an opening in a radial actuator assembled from insulated electrical-steel laminations stacked axially. Whenever this flux changes in time, it induces an electrical current in each lamination which is responsible for the dynamic axial force reduction and an additional phase lag. In an improved actuator design, a current path in each lamination is interrupted by a single slot located between two radial control poles. In order to maintain structural integrity of the stack and magnetic conductivity between the radial poles, the slot position is rotated by 90 degrees between each subsequent lamination in the stack. The solution has been evaluated in a test actuator with 3000N axial and 1200N radial load capacities. 7dB gain improvement and 15 degrees phase improvement at 30Hz have been demonstrated.
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5

Kim, Ha-Yong, and Chong-Won Lee. "Design and Control of Active Magnetic Bearing System With Lorentz Force Type Axial Actuator." In ASME 2003 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. ASMEDC, 2003. http://dx.doi.org/10.1115/detc2003/vib-48542.

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As the size of 5-axis active magnetic bearing (AMB) gets smaller, the space limitation for installation of axial magnetic bearing unit becomes stringent. In this paper, a new type of compact, high-performance 5-axis AMB with solid cores and rotor is proposed, which consists of four permanent magnets, four U-shaped cores and 16 control coils. The proposed homopolar AMB system is levitated by the Lorentz type axial as well as Maxwell type radial forces. Based on the magnetic flux distribution analysis, the control algorithm is designed to account for the coupled effect between the radial and axial control fluxes. Experiments are also carried out with a prototype AMB system to validate the new design concept.
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6

Ismagilov, Flur R., Vyacheslav E. Vavilov, and Ildus F. Savakhov. "Research of Magnetic Fields in New Design of Homopolar Magnetic Bearing." In 2018 XIV International Scientific-Technical Conference on Actual Problems of Electronics Instrument Engineering (APEIE). IEEE, 2018. http://dx.doi.org/10.1109/apeie.2018.8545711.

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7

Franz, Daniel, Michael Richter, Maximilian Schneider, and Stephan Rinderknecht. "Homopolar Active Magnetic Bearing Design for Outer Rotor Kinetic Energy Storages." In 2019 IEEE International Electric Machines & Drives Conference (IEMDC). IEEE, 2019. http://dx.doi.org/10.1109/iemdc.2019.8785389.

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8

Palazzolo, Alan, Randall Tucker, Andrew Kenny, Kyung-Dae Kang, Varun Ghandi, Jinfang Liu, Heeju Choi, and Andrew Provenza. "High Temperature, Permanent Magnet Biased, Fault Tolerant, Homopolar Magnetic Bearing Development." In ASME Turbo Expo 2008: Power for Land, Sea, and Air. ASMEDC, 2008. http://dx.doi.org/10.1115/gt2008-50917.

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This paper summarizes the development of a magnetic bearing designed to operate at 1,000F. A novel feature of this high temperature magnetic bearing is its homopolar construction which incorporates state of the art high temperature, 1,000F, permanent magnets. A second feature is its fault tolerance capability which provides the desired control forces with over one-half of the coils failed. The construction and design methodology of the bearing is outlined and test results are shown. The agreement between a 3D finite element, magnetic field based prediction for force is shown to be in good agreement with predictions at room and high temperature. A 5 axis test rig will be complete soon to provide a means to test the magnetic bearings at high temperature and speed.
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9

Hawkins, Lawrence A. "Shock Analysis for a Homopolar, Permanent Magnet Bias Magnetic Bearing System." In ASME 1997 International Gas Turbine and Aeroengine Congress and Exhibition. American Society of Mechanical Engineers, 1997. http://dx.doi.org/10.1115/97-gt-230.

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A transient, nonlinear analysis was developed and used to study the effect of shock machine testing on a gas turbine simulator supported by homopolar, permanent magnet bias magnetic bearings. The magnetic bearing nonlinearities modeled included saturation effects, clearance effects, and integrator and current limits. Free vertical travel of the shock machine anvil table supporting the simulator was also modeled. The magnetic bearing model was coupled to characteristic matrix based models of the rotor and support system and integrated to produce a time simulation of system performance. The results indicate saturation of the magnetic bearing for brief periods following impacts significant enough to exceed design load capacity, followed by recovery to stable operation in less than a second. The analysis was used to evaluate sizing for the magnetic bearing and backup bearing systems and to evaluate the control system strategy.
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10

Yamamoto, R. I., and O. Horikawa. "Magnetic bearing with uniaxial control using radial layers repulsive type magnetic bearing." In 2017 IEEE International Magnetics Conference (INTERMAG). IEEE, 2017. http://dx.doi.org/10.1109/intmag.2017.8007868.

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