Abstract
We present a new approach to computing cogging torque based on only one analytical field solution in surface-mounted permanent-magnet (PM) motors. We use conformal transformation to compute the magnetic field created by the permanent magnets in the air gap with a single slot. Then, we derive the cogging torque due to the single-slot effect at different rotor positions directly from the 2-D analytical field solution. The total cogging torque is synthesized from the contribution of each slot. We have applied our approach to predicting the cogging torque of two surface-mounted PM motors, one with 4 poles, 24 slots and the other with 42 poles, 36 slots. The predicted cogging torques for both applications agree well with those obtained from 2-D finite-element analysis.
| Original language | English |
|---|---|
| Article number | 5208505 |
| Pages (from-to) | 3296-3302 |
| Number of pages | 7 |
| Journal | IEEE Transactions on Magnetics |
| Volume | 45 |
| Issue number | 9 |
| DOIs | |
| Publication status | Published - 1 Sep 2009 |
Keywords
- Analytical field solution
- Cogging torque
- Conformal transformation
- Permanent-magnet machine
ASJC Scopus subject areas
- Electrical and Electronic Engineering
- Electronic, Optical and Magnetic Materials