This study examines the effects of different rotor skew patterns on the cogging torque, the excitation torque ripple, the average torque, and the axial force in an interior permanent magnet synchronous motor. A genetic algorithm is used to minimise the cogging torque for different skew patterns based on analytical functions. The optimal design obtained is verified with finite element analysis. The results show that the linear skew patterns reduce the cogging torque, but increase the axial force. Four- and five-step symmetric skew, herring-bone skew, and five-step W-shaped skew patterns provide an adequate reduction in the cogging torque and axial force, but they have higher excitation torque ripple compared with the linear skew pattern.
Rotor skew pattern design and optimisation for cogging torque reduction
IET Electrical Systems in Transportation ; 6 , 2 ; 126-135
2016-06-01
10 pages
Article (Journal)
Electronic Resource
English
linear skew patterns , rotor skew pattern design , genetic algorithm , cogging torque minimisation , herring-bone skew patterns , synchronous motors , excitation torque ripple , five-step W-shaped skew patterns , permanent magnet motors , axial force , finite element analysis , rotor skew pattern optimisation , cogging torque reduction , rotors , four-step symmetric skew patterns , interior permanent magnet synchronous motor , analytical functions , machine control , torque control , genetic algorithms , five-step symmetric skew patterns
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