Purpose – The purpose of this paper is to investigate a new cause of torque ripple in interior permanent magnet (IPM) alternating current (AC) motors, which is common but has hardly been studied. The paper also proposes a new method to suppress the total torque ripple. Design/methodology/approach – Besides the well-known cogging torque and mutual torque ripple, a new ripple which exists in the reluctance torque is found. It is verified with both analytical model and finite element analysis. Also, a novel method is proposed to reduce the reluctance torque ripple, with experimental validation. Findings – It is usually said that the winding inductances of an IPM AC motor vary sinusoidally with the rotor position, thus, the d-axis and q-axis inductances are constant, whilst the reluctance torque is smooth. However, in most practical motors, the inductances vary irregularly, causing a significant ripple in the reluctance torque. Moreover, in machine design, it is always desirable to suppress the cogging torque...
[1]
G. Kang,et al.
A Novel Cogging Torque Reduction Method for Interior Type Permanent Magnet Motor
,
2007,
2007 IEEE Industry Applications Annual Meeting.
[2]
Kwang-Joon Kim,et al.
Characterization of noise and vibration sources in interior permanent-magnet brushless DC motors
,
2004
.
[3]
Steven A. Evans,et al.
Salient pole shoe shapes of interior permanent magnet synchronous machines
,
2010,
The XIX International Conference on Electrical Machines - ICEM 2010.
[4]
Liang Fang,et al.
Study on high-efficiency characteristics of interior permanent magnet synchronous motor with different magnet material
,
2009,
2009 International Conference on Electrical Machines and Systems.