High-Efficiency Induction Motor with Small Gap Length and Magnetic Wedges

Sugimoto, Shinji; Takahashi, Akeshi; Endo, Mikio; Tamura, Toshiaki; Kinoshita, Hirotaka

doi:10.1541/ieejias.140.239

Cited by 4 publications

(2 citation statements)

References 2 publications

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“…Particularly, eddy current loss on the rotor surface grows with rotation speed, which leads to problems like the decline in efficiency and temperature rise in permanent magnets. Magnetic wedges were proposed as a means to suppress slot harmonics 2 …”

Section: Introductionmentioning

confidence: 99%

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Formulation and mixing conditions of magnetic composite materials used for magnetic wedges in an interior permanent magnet synchronous motor

Horiuchi

Yoshida

Nirei

et al. 2023

Electrical Engineering Japan

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An interior permanent magnet synchronous motor (IPMSM) is characterized by its high efficiency. However, torque ripple and loss occur because of the spatial harmonics generated by air‐gap permeance fluctuations. This study clarified that slot harmonic components can be suppressed by inserting magnetic wedges made of magnetic composite material in the slot opening of an IPMSM. First, the authors examined the torque and loss characteristics by varying relative permeability and saturation magnetic flux density of magnetic wedges using finite element analysis (FEA). Results indicated that the torque ripple and loss could be suppressed when the relative permeability of the magnetic wedge was μr = 10 to 22 and the saturation magnetic flux density was Bs = 0.5 to 0.75 T. Furthermore, the authors produced magnetic composite materials made of various soft magnetic material powders and examined their magnetic properties and viscosities. Results showed that a magnetic composite material with optimal magnetic properties and injectable viscosity could be manufactured using Fe‐Si‐Al with a low volume fraction.

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Section: Introductionmentioning

confidence: 99%

“…Magnetic wedges were proposed as a means to suppress slot harmonics. 2 Previous studies on magnetic wedges explored relations between the relative permeability of magnetic wedges, air-gap flux density, and efficiency. 3,4 Thus, magnetic wedges were shown to suppress ripple in air-gap flux density, and to improve efficiency.…”

Section: Introductionmentioning

confidence: 99%