Irreversible Demagnetization Analysis for Multilayer Magnets of Permanent Magnet-Assisted Synchronous Reluctance Machines Considering Current Phase Angle

Huynh, Thanh Anh; Hsieh, Min‐Fu

doi:10.1109/tmag.2019.2911867

Cited by 27 publications

(10 citation statements)

References 16 publications

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“…Most of those works focused on methods of machine diagnostics in terms of the occurrence of the phenomenon of permanent magnet demagnetization as a result of improper power supply, control, emergency short-circuits, and other unfavorable operating conditions. Many studies are also dedicated to the demagnetization influence on the machine operation [43][44][45][46][47]. On the basis of the cited studies, it can be concluded that short-circuits represent the greatest threat to IPM as they may lead to very high peak values of currents.…”

Section: Study On Winding Short-circuit Faultmentioning

confidence: 99%

Influence of a Winding Short-Circuit Fault on Demagnetization Risk and Local Magnetic Forces in V-Shaped Interior PMSM with Distributed and Concentrated Winding

et al. 2021

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This paper presents a comparison of 30/8 and 12/8 AC permanent magnet motors with distributed (DW) and concentrated winding (CW) designed for electric vehicle traction. Both prototypes are based on an interior permanent magnet (IPM) motor topology and contain V-shape magnets. The radial flux AC IPM motors were designed for an 80 kW propulsion system to achieve 125 N·m. Finite element models (FEM) used to design the geometry of IPM motors and the required useful parameters of electric motors are widely investigated. The accuracy of finite element models is verified and validated on the basis of test data. Numerical simulations of healthy and faulty operation states, and studies of winding faults based on the FEM offer a deeper understanding of the associated phenomena. Therefore, in this paper, a short-circuit fault in a stator winding was simulated to investigate the transient currents under an external load collapse, for all winding phases. These simulations were used to define other important machine parameters to improve mechanical reliability of the motors and to assess the potential risk of permanent magnet (PM) demagnetization. Furthermore, the analysis of local magnetic forces affecting the PMs in the rotor and their possible displacement in a short-circuit situation were performed, also taking into account the centrifugal force. Lastly, it is demonstrated that the choice of winding configuration has a significant impact on the uncontrolled displacement of magnets in the rotor.

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Section: Study On Winding Short-circuit Faultmentioning

confidence: 99%

Influence of a Winding Short-Circuit Fault on Demagnetization Risk and Local Magnetic Forces in V-Shaped Interior PMSM with Distributed and Concentrated Winding

et al. 2021

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“…17, the saturation level turns out to be different at different current angles. Thus, Ld and Lq are different at different current angles [28]. When the rated current with respective optimal initial phase angle is applied to the stator windings, the output torques can be calculated for the three machines as shown in Fig.…”

Section: On-load Performancementioning

confidence: 99%

“…20 shows the B-H curves of N42H PM under different temperatures. Furthermore, the filed distributions and PM working point variations of the BFPMM and CPRM subject to the 3*rated-load [28] operation at different temperatures are plotted in Figs. 21 and 22.…”

Section: Demagnetizing Withstand Capabilitymentioning

confidence: 99%

A Parallel Consequent Pole Reluctance Machine With Bipolar Coil Flux-Linkage

et al. 2020

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This paper proposes a novel parallel consequent pole reluctance machine (CPRM) by introducing dual heteropolar stators and shifted rotors in the axial direction. The proposed machine is geometrically similar to traditional switched reluctance machine (SRM), but with biased permanent magnets (PMs) alternately mounted on stator poles. With this kind of design concept, bipolar sinusoidal coil flux-linkages can be obtained due to the elimination of even harmonics of two axially parallel submachines. Consequently, the harmonic distortions of phase flux-linkage and cogging torque of the proposed 6/4-pole parallel CPRM are notably reduced. The topology features, even-order harmonic cancellation theory and analytical modeling, are addressed, respectively. Then, the electromagnetic characteristics of the proposed 6/4-pole parallel CPRM are investigated and compared with those original variable reluctance machines. Comparison results demonstrate that the proposed parallel CPRM can achieve basically bipolar sinusoidal flux linkage and back-electromotive force (EMF), as well as reduced cogging torque than its original counterparts. Permeance function of the stator poles with NdFeB PMs λs-core (α) Permeance function of the stator poles with core poles λs-front (α)

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“…References [5,7] studied the number of permanent magnets in PMA-SynRM and different placement methods to improve the motor performance. Reference [8] gave the most easily demagnetized PMA-SynRM motor position and noted that the middle part's permanent magnet material is easy to demagnetize. In reference [9], the parameters of the PMA-SynRM and the demagnetization of centralized winding and distributed winding motors were studied.…”

Section: Introductionmentioning

confidence: 99%

A Novel Modular Permanent Magnet-Assisted Synchronous Reluctance Motor

Liu

et al. 2021

IEEE Access

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This paper proposes a novel modular permanent magnet-assisted synchronous reluctance motor (MPMA-SynRM) structure. The rotor is composed of two types of rotor modules that are axially combined. This article analyses and explains the combined angle of the axial assembly of different rotor modules. The MPMA-SynRM rotor module is optimized using a differential evolution algorithm and the MPMA-SynRM space vector diagram is established to give the torque calculation an analytical expression. Whether there is axial magnetic isolation between different rotors is analysed, and various segment numbers, pole arc coefficients, and length ratios are used for different rotor modules to affect the electromagnetic influence of the MPMA-SynRM's cogging torque. Detailed analyses of the MPMA-SynRM loss, efficiency, and permanent magnet demagnetization state are given. The no-load back EMF, power factor, efficiency, eddy current loss, and cogging torque of the MPMA-SynRM with traditional Nd-Fe-B permanent magnet motors and permanent magnet auxiliary synchronous reluctance motors are compared, and a prototype is made to prove the performance of this motor.

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Irreversible Demagnetization Analysis for Multilayer Magnets of Permanent Magnet-Assisted Synchronous Reluctance Machines Considering Current Phase Angle

Cited by 27 publications

References 16 publications

Influence of a Winding Short-Circuit Fault on Demagnetization Risk and Local Magnetic Forces in V-Shaped Interior PMSM with Distributed and Concentrated Winding

Influence of a Winding Short-Circuit Fault on Demagnetization Risk and Local Magnetic Forces in V-Shaped Interior PMSM with Distributed and Concentrated Winding

A Parallel Consequent Pole Reluctance Machine With Bipolar Coil Flux-Linkage

A Novel Modular Permanent Magnet-Assisted Synchronous Reluctance Motor

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