所属单位：自动化学院
发表刊物：IEEE Trans Ind Electron
摘要：Cogging torque, inherent in permanent magnet machines, is closely related to the airgap flux density harmonic contents. The third harmonic can be utilized in combination with the fundamental one to increase the average torque, whilst its relationship with cogging torque is uncertain. The aim of this paper is to investigate the effect of third harmonic in airgap flux density on cogging torque in surface-mounted permanent magnet (SPM) machines considering different slot/pole (S/P) combinations. First, based on the simplified expressions of cogging torque in machines with sinusoidal plus third harmonic (Sine+3rd) airgap flux density, S/P combinations are classified into four cases for discussion. It is found that when Ns/GCD (Ns, Np) ≥ 4 (Ns: Slot number; Np: Pole number; GCD: Great common divisor), third harmonic in airgap flux density has no effect on cogging torque. Otherwise, cogging torque will be generated. Furthermore, two approaches for obtaining the Sine and Sine+3rd airgap flux density, i.e., Sine/Sine+3rd hm and Sine/Sine+3rd Br, are validated, based on which finite-element analyses are carried out on four machines, i.e., 12-slot/10-pole (12S12P), 12S6P, 12S8P, and 12S10P to verify the conclusion. Finally, the 12S8P and 12S10P Sine+3rd SPM machines are prototyped and tested for validation. © 2018 IEEE.
ISSN号：0278-0046
是否译文：否
发表时间：2019-08-01
合写作者：Sun, H.Y.,王凯
通讯作者：Sun, H.Y.,孙慧玉
发表时间：2019-08-01