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영구 자석 직류전동기 내의 코깅 토크 저감을 위한 설계 변수의 민감도 해석
황상문(S.M. Hwang) 한국자동차공학회 1996 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1996 No.11_1
For motor operation at low speeds and loads, torque pulsation by the cogging torque is often a source of vibration and control difficulty. In this paper, the magnetic field of a motor is calculated by finite element methods. The periodic cogging torque is determined using Maxwell stress method and time stepping method, and then decomposed using Fourier series expansion. The purpose of this paper is to characterize design parameters on the cogging torque and to design a permanent magnet motor with a cogging torque less vulnerable to vibration, without sacrificing the motor performance. The design parameters include stator slot width, permanent magnet slot width, airgap length and magnetization direction. A new design with a less populated frequency spectrum of the cogging torque is proposed after characterizing individual effect of design parameters. Magnet pole shaping, by gradually increasing the thickness of the permanent magnet at edges, yields a smooth shape for the cogging torque with reduced higher harmonics.
김평호(P. H. Kim),권중학(J. H. Kwon),이종석(J. S. Lee),황상문(S. M. Hwang) 대한기계학회 2009 대한기계학회 춘추학술대회 Vol.2009 No.5
This paper is about design for minimum flux leakage in microspeaker used for radiotelegraph. Response Surface Method (RSM) is applied as the optimization technique high magnetic force. Object function are magnetic force and flux leakage as three factors. Pole piece thickness, magnet grade and yoke thickness which are selected in design of experiment. Magnetic force and flux leakage are calculated for each condition and optimized by results evaluated with RSM. When those factors are the thickness of pole piece of 0.9㎜ magnet grade of N42H and the thickness of yoke of 0.75 ㎜. Magnetic force is satisfied and flux leakage is decreased to 11.8%.