Acoustic Noise of Switched Reluctance and Permanent Magnet Motors: A Comparison in the Context of Electric Brakes

2007 ◽  
Author(s):  
Avoki M. Omekanda ◽  
Suresh Gopalakrishnan ◽  
Harald Klode
Keyword(s):  
Permanent Magnet ◽  
Acoustic Noise ◽  
Permanent Magnet Motors ◽  
Switched Reluctance

scholarly journals Review of Switched Reluctance Motor Control for Acoustic Noise and Vibration Reduction

2018 ◽  
Vol 1 (2) ◽  
pp. 59-62
Author(s):  
Jihad Furqani ◽  
Agus Purwadi ◽  
◽  
Keyword(s):  
Permanent Magnet ◽  
Hybrid Electric Vehicle ◽  
Acoustic Noise ◽  
Vibration Reduction ◽  
Switched Reluctance Motor ◽  
Permanent Magnet Motor ◽  
Noise And Vibration ◽  
Switched Reluctance ◽  
Reluctance Motor ◽  
Noise And Vibration Reduction

Switched Reluctance Motor (SRM) is one of the candidates for substituting permanent magnet motor in Hybrid Electric Vehicle (HEV) application. Compared to permanent magnet motor, SRM is relatively low cost, robust, high reliability, and possible for high-temperature operation because of the absence of permanent magnet. One significant problem in SRM is the high acoustic noise and vibration. The vibration in SRM is caused by the radial forces acting at the stator teeth. Because of the saliency pole configuration in SRM, vibration is prominent. Many studies tried to reduce acoustic noise and vibration in SRM. In this paper, several controls for acoustic noise and vibration reduction are shown. The acoustic noise and vibration reduction from the experiment are also compared in each method.

Cogging torque and acoustic noise reduction in permanent magnet motors by teeth pairing

2000 ◽  
Vol 36 (5) ◽  
pp. 3144-3146 ◽  
Author(s):  
Sang-Moon Hwang ◽  
Jae-Boo Eom ◽  
Geun-Bae Hwang ◽  
Weui-Bong Jeong ◽  
Yoong-Ho Jung
Keyword(s):  
Noise Reduction ◽  
Permanent Magnet ◽  
Acoustic Noise ◽  
Permanent Magnet Motors ◽  
Cogging Torque

Current Waveform Optimization for Low Noise Permanent Magnet Motors

2002 ◽  
Author(s):  
Guandong Jiao ◽  
Christopher D. Rahn
Keyword(s):  
Permanent Magnet ◽  
Permanent Magnets ◽  
Acoustic Noise ◽  
Radial Force ◽  
Low Noise ◽  
Rotating Magnetic Field ◽  
Permanent Magnet Motors ◽  
Reduction In Force ◽  
Acoustic Signature ◽  
Force Ripple

During torque production, the varying magnetic fields inside an electric motor excite vibration that radiates acoustic noise. In consumer applications, this noise can influence the perceived product quality. Noises from propulsion and auxiliary electric motors on naval vessels create an acoustic signature that increases detectability. The dominant noise occurs at twice the electrical frequency (2E). For permanent magnet (PM) machines, the attraction between the rotor permanent magnets and the stator iron causes a radial force that varies sinusoidally around the stator. The stator coil currents generate a rotating magnetic field that produces rotor torque. This paper develops a new commutation strategy for PM machines that uses higher stator currents to minimize 2E noise by reducing radial force ripple without sacrificing torque. An analytical model is developed that predicts rotor torque and radial force ripple as functions of the stator currents. Based on this model, the phase currents are optimally commutated to maintain constant torque production and reduce force ripple. The optimal commutation is numerically investigated on a small PM motor using ANSYS FEA. The ANSYS results show a 30% reduction in force ripple at no load.

scholarly journals Analytical Calculation of Armature Reaction Field of the Interior Permanent Magnet Motor

Energies ◽  
2018 ◽  
Vol 11 (9) ◽  
pp. 2375 ◽  
Author(s):  
Fangwu Ma ◽  
Hongbin Yin ◽  
Lulu Wei ◽  
Liang Wu ◽  
Cansong Gu
Keyword(s):  
Magnetic Field ◽  
Permanent Magnet ◽  
Calculation Method ◽  
Acoustic Noise ◽  
Analytical Calculation ◽  
Critical Issue ◽  
Permanent Magnet Motors ◽  
Reaction Field ◽  
Armature Reaction ◽  
Interior Permanent Magnet

The energy crisis and environmental concerns worldwide have helped usher in the age of electric vehicles (EVs) and hybrid EVs (HEVs). The interior permanent magnet motors (IPMMs) are widely used in these vehicles. The analysis of the armature reaction field is the most critical issue in the study of IPMMs since it determines the characters of torque, efficiency, vibration, and the radiated acoustic noise. This paper provides a calculation method of the armature reaction magnetic field (ARMF) of an IPMM. First, the formulas of ARMF without magnetic barrier are derived. Second, the relative permeance function of an IPMM is calculated. Third, the analytical solution of the ARMF of an IPMM is derived by applying the armature reaction magnetic field with unsaturated rotor multiplied by relative permeance function. Finally, several results of comparisons between the calculation method proposed in this paper and the finite element method are presented. Based on the calculation method proposed in this paper, the magnetic barrier’s influence on the ARMF is studied. The spatial harmonic orders and time harmonic orders of the ARMF of IPMM are revealed respectively.

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