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Cogging torque and torque ripple

- July 31, 2020 at 5:42 pm
  
  VivekKamble
  Ansys Employee
  
  Is cogging torque and torque ripple same in a PMSM?
- July 31, 2020 at 5:42 pm
  
  Charlotte Blair
  Ansys Employee
  
  No, Torque ripple arises due to imperfect commutation of the phase currents, Ripple introduced in the current waveform due to chopping and due to reluctance variation, due to slotting, in the magnetic circuit as the rotor rotates which is called cogging. So, Cogging is a part of torque ripple and torque ripple is a combined effect of many factors.
- July 31, 2020 at 5:43 pm
  
  NKC
  Forum Moderator
  
  You can feel the cogging torque when you rotate the motor shaft with your hand. Whereas the effects of imperfect commutation and current ripple cannot be detected in this way.

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