Design to Reduce Rotor Losses in Fault-Tolerant Permanent-Magnet Machines

Zheng, Junqiang; Zhao, Wenxiang; Ji, Jinghua; Zhu, Jihong; Gu, Chenyu; Zhu, Shengdao

doi:10.1109/tie.2018.2807363

Cited by 34 publications

(8 citation statements)

References 45 publications

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“…Permeance harmonics, the spatial harmonics of magnetomotive force (MMF) and harmonics due to nonsinusoidal current induce the eddy current in conductive rotor parts, and thus produce ohmic loss [15], [16]. To reduce current waveform distortion, high switching frequency SiC inverter equipped with output filters is developed for this application.…”

Section: Rotor Eddy Current Loss Reductionmentioning

confidence: 99%

Rotor Eddy Current Loss Reduction With Permeable Retaining Sleeve for Permanent Magnet Synchronous Machine

Zhu

Huang

Dong

et al. 2020

IEEE Trans. Energy Convers.

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This paper presents a new rotor design to reduce rotor eddy current loss of a high-speed permanent magnet synchronous machine for flywheel energy storage system. Instead of using common nonmagnetic sleeves, the new rotor incorporates permeable retaining sleeves (PRSs) to fix permanent magnets on the rotor hub. The PRSs are made of permalloy that features high permeability and high electrical conductivity. Thus, skin depths for asynchronous harmonics are extremely small. On the other hand, the PRSs are electrically insulated along the circumferential direction. Owing to these two reasons, rotor eddy current loss at open circuit decreases by 64.2% without sacrificing torque output, compared with an original rotor with nonmagnetic retaining sleeve. In addition, thermal and structural finite element analyses are performed to calculate rotor temperature distribution and evaluate the structural integrity of the new rotor. Rotor eddy current loss reduction benefits lowering rotor temperature rise. Prototype machine with the new rotor is fabricated, and preliminary tests are carried out to confirm the analysis results.

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Section: Rotor Eddy Current Loss Reductionmentioning

confidence: 99%

Rotor Eddy Current Loss Reduction With Permeable Retaining Sleeve for Permanent Magnet Synchronous Machine

Zhu

Huang

Dong

et al. 2020

IEEE Trans. Energy Convers.

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show abstract

“…In Refs. [16][17], appropriate flux barriers were arranged in a rotor yoke to reduce EC losses. An analytical expression was simultaneously derived by the simplified permeance model.…”

Section: Introduction1mentioning

confidence: 99%

Sleeve design of permanent-magnet machine for low rotor losses

Zheng

Zhao

et al. 2020

Chin. J. Electr. Eng.

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“…To block the permanent magnet and reduce the volume of eddy current induction has been widely implemented to reduce the eddy current loss of permanent magnet [6, 7]. In addition, relevant researches show that an appropriate flux barrier at the yoke of that below the rotor permanent magnet can reduce the rotor permanent magnet loss and demagnetisation risk by increasing the D ‐axis reluctance [8, 9]. In order to reduce cogging torque, stator slotting, unequal pole arc coefficient and axial sectional staggered splicing of the rotor are often used [10].…”

Section: Introductionmentioning

confidence: 99%