Journal of the Japan Society of Applied Electromagnetics and Mechanics
Online ISSN : 2187-9257
Print ISSN : 0919-4452
ISSN-L : 0919-4452
The 10th Asia-Pacific Symposium on Applied Electromagnetics and Mechanics (APSAEM 2024)
Improvement in the Efficiency of an Interior-winding Synchronous Motor with Magnetic Rings
Ryoto TAKAGI , Jun KITAJIMA, Tsutomu MIZUNO, Mitsuhide SATO, Masami NIREI
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Keywords: Interior-winding synchronous motor, Permanent magnet, Magnetic ring, Spatial harmonic, Cogging torque
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2025 Volume 33 Issue 3 Pages 205-210

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Abstract
In recent years, high speeds have been required to reduce the size of motors, but motors driven at high speeds are prone to increased losses. Among others, the generation of cogging torque due to spatial harmonics and the reduction in efficiency due to heat generation are considered. Therefore, this study proposes an interior-winding synchronous motor (IWSM) with a magnetic composite ring in the stator to suppress spatial harmonics. The efficiency of this IWSM is 7.3% higher than that of conventional motors.
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