Effects of leakage flux on magnetic fields of interior permanent magnet synchronous motors

2001 ◽  
Vol 37 (4) ◽  
pp. 3021-3024 ◽  
Author(s):  
Chang-Chou Hwang ◽  
Y.H. Cho
Keyword(s):  
Magnetic Fields ◽  
Permanent Magnet ◽  
Permanent Magnet Synchronous Motors ◽  
Synchronous Motors ◽  
Leakage Flux ◽  
Interior Permanent Magnet

scholarly journals Mechanism of Torque Ripple Generation by Time and Space Harmonic Magnetic Fields in Permanent Magnet Synchronous Motors

2021 ◽  
Author(s):  
Katsumi Yamazaki ◽  
Kento Utsunomiya ◽  
Hiroaki Ohiwa
Keyword(s):  
Magnetic Fields ◽  
Permanent Magnet ◽  
Torque Ripple ◽  
Time And Space ◽  
Permanent Magnet Synchronous Motors ◽  
Space Harmonic ◽  
Synchronous Motors ◽  
Interior Permanent Magnet ◽  
Rotor Surface ◽  
Torque Ripples

In this article, we investigate mechanism of torque ripple generation by time and space harmonic magnetic fields in permanent magnet synchronous motors to obtain advanced motor designs. The general expression between the torque ripples and harmonic air-gap flux densities in the motor is derived by using Maxwell stress tensor. <a>Both the numerical and experimental verifications of this expression are carried out.</a> Then, the major harmonic magnetic fields that produce the torque ripples are specified and the differences between the surface and interior permanent magnet synchronous motors are investigated. According to these investigations, the shape of the rotor surface of an interior permanent magnet motor is optimized. It is clarified that specific harmonic components of the torque ripples in interior permanent magnet synchronous motors can be reduced to be nearly zero by optimizing the rotor surface shape.

scholarly journals Mechanism of Torque Ripple Generation by Time and Space Harmonic Magnetic Fields in Permanent Magnet Synchronous Motors

2021 ◽  
Author(s):  
Katsumi Yamazaki ◽  
Kento Utsunomiya ◽  
Hiroaki Ohiwa
Keyword(s):  
Magnetic Fields ◽  
Permanent Magnet ◽  
Torque Ripple ◽  
Time And Space ◽  
Permanent Magnet Synchronous Motors ◽  
Space Harmonic ◽  
Synchronous Motors ◽  
Interior Permanent Magnet ◽  
Rotor Surface ◽  
Torque Ripples

In this article, we investigate mechanism of torque ripple generation by time and space harmonic magnetic fields in permanent magnet synchronous motors to obtain advanced motor designs. The general expression between the torque ripples and harmonic air-gap flux densities in the motor is derived by using Maxwell stress tensor. <a>Both the numerical and experimental verifications of this expression are carried out.</a> Then, the major harmonic magnetic fields that produce the torque ripples are specified and the differences between the surface and interior permanent magnet synchronous motors are investigated. According to these investigations, the shape of the rotor surface of an interior permanent magnet motor is optimized. It is clarified that specific harmonic components of the torque ripples in interior permanent magnet synchronous motors can be reduced to be nearly zero by optimizing the rotor surface shape.

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