Magnetic Bearing Controls for a High Speed, High Power Switched Reluctance Machine (SRM) Starter/Generator

Potgieter, Charl; Hope, Winston; Gregory, Earl

doi:10.4271/2000-01-3665

Cited by 6 publications

(4 citation statements)

References 3 publications

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“…This principle can be similarly applied to the B-and C-phase windings. Neglecting the leakage flux and saturation effects, the equations describing the torque and the radial forces can be written from the previous paper [12], [14] as, 1 1 …”

Section: Modified Inverse Decoupling Control For Bearingless Switchedmentioning

confidence: 99%

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Modified inverse decoupling control for bearingless switched reluctance motors operating in irreversible domain

Zhu

Sun

2014

2014 17th International Conference on Electrical Machines and Systems (ICEMS)

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The paper proposed a modified inverse decoupling control method for bearingless switched reluctance motors (BSRMs) operating in irreversible domain. The reversibility of the model was analyzed and the irreversible domain was deduced. Then, the modified inversion was obtained via the modification of a feed-back variable. And BSRM was decoupled into two secondorder integral type displacement subsystems and one first-order integral type speed subsystem by the modified inversion. Besides, to enhance the control performance, a closed-loop compound control system was designed for subsystems. Finally, experiment results show that the proposed approach can realize decoupling control for BSRM in irreversible domain, and it has good suspension stability and regulation-speed performance.

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Section: Modified Inverse Decoupling Control For Bearingless Switchedmentioning

confidence: 99%

“…Compared with magnetic bearing switched reluctance motors [1], BSRMs shorten the shaft length and produce a compact size. Hence, BSRMs are particularly suitable for high speed drives under special environments, like molecular pump, centrifugal pump, ywheels, compressors and aerospace [2], [3].…”

Section: Introductionmentioning

confidence: 99%

Modified inverse decoupling control for bearingless switched reluctance motors operating in irreversible domain

Zhu

Sun

2014

2014 17th International Conference on Electrical Machines and Systems (ICEMS)

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“…Switched reluctance motors (SRMs), due to their inherent advantages such as simple structure, no permanent magnets on the rotor and strong environmental adaptability, have a wide range of applications in aerospace, flywheel energy storage and electric vehicles [1][2][3][4]. Magnetic levitation technology is often used to solve the problem of mechanical bearing support for SRMs at high speeds [5]. A bearingless switched reluctance motor (BSRM) may simultaneously generate radial force and torque by integrating both active magnetic bearing and SRM functions into the same structure, and it then has a shorter axial length, high critical speed and superior high-speed performance, thus it is considered suitable for operation in ultra-clean environments or in intense temperature variations, such as centrifugal blood pumps, flywheel storage and starters/generators in aircraft engines [6][7][8].…”

Section: Introductionmentioning

confidence: 99%

Control and Analysis of a Hybrid-Rotor Bearingless Switched Reluctance Motor with One-Phase Full-Period Suspension

Liu,

Wu,

Zhang

et al. 2024

Symmetry

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In the traditional control scheme of a 12/8-pole bearingless switched reluctance motor (BSRM), radial force and torque are usually controlled as a compromise due to the conflict between their effective output areas. Additionally, each phase requires individual power circuits and is excited in turn to produce a continuous levitation force, resulting in high power device requirements and high controller costs. This paper discusses a 12/8-pole single-winding hybrid-rotor bearingless switched reluctance motor (HBSRM) with a hybrid rotor consisting of cylindrical and salient-pole lamination segments. The asymmetric rotor of the HBSRM slightly increases the complexity of its structure and magnetic circuit, but makes it possible to generate the desired radial force at any rotor angular position. A control scheme for the HBSRM is developed to utilize the independent excitation of the four windings in one phase to generate the desired levitation force at any rotor angular position, and it requires only half the number of power circuits used in the conventional control scheme of a 12/8-pole single-winding BSRM. Different from the average torque chosen to be controlled in traditional methods, this scheme directly regulates the instantaneous total torque produced by all excited phases together and presents a current algorithm to optimize the torque contribution of each phase so as to reduce torque pulsation, and the improved performance of this bearingless motor is finally validated by simulation analysis.

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“…Although permanent magnet bias axial magnetic bearing (PMAB) can only suspend in single degree freedom, while applied in magnetic suspended system of 5-degree freedom, it can simplify the structure, improve the reliability, and reduce power loss of the system. It can compose 5-degree freedom magnetic suspended system of low power loss with a permanent magnetic force bearing [4] ; And it also can compose 5-degree freedom magnetic suspended motor system of high power density with a radial magnetic bearing [5] .…”

Section: Introductionmentioning

confidence: 99%

Structure and Finite Element Analysis for a Permanent Magnet Bias Axial Magnetic Bearing

Zhao

Deng

Wang

et al. 2011

AMR

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A new permanent magnet bias axial magnetic bearing (PMAB) is introduced, then the structure and operation principle are analyzed. The equivalent magnetic circuit is established to deduce the mathematic expression. The parameter design and calculation of the magnetic bearing are presented including available area of magnetic pole, ampere - turns of control coils etc. The parameters of the proposed prototype are also given. The 3-D magnetic field simulation is performed by using the Finite Element software. The theory analysis and the simulation show that the maximum suspension magnetic force satisfies the design requirement. The magnetic suspension forces have better linearity and symmetry around the balanced position. Therefore, the proposed PMAB is suitable for the high speed or low loss occasions.

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Magnetic Bearing Controls for a High Speed, High Power Switched Reluctance Machine (SRM) Starter/Generator

Cited by 6 publications

References 3 publications

Modified inverse decoupling control for bearingless switched reluctance motors operating in irreversible domain

Modified inverse decoupling control for bearingless switched reluctance motors operating in irreversible domain

Control and Analysis of a Hybrid-Rotor Bearingless Switched Reluctance Motor with One-Phase Full-Period Suspension

Structure and Finite Element Analysis for a Permanent Magnet Bias Axial Magnetic Bearing

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