Reducing the cogging torque in brushless DC motors by using conformal mappings

We present an exact model for determining the cogging torque in a brushless DC (BLDC) motor. It is based on the conformal mapping (CM) method, by which the motor configuration is transformed to a configuration where the magnetic field can be determined. Then, by integrating the field over the stator surface, the cogging torque is determined. By varying some motor parameters, which is easy to do, an optimal configuration with the minimal cogging torque is obtained. We have confirmed the results by the finite-element method (FEM). The model produces results much faster than FEM alone.


Published in:
IEEE Transactions on Magnetics, 40, 2, 451-455
Year:
2004
Keywords:
Note:
Ecole Polytech. Federale de Lausanne, CH-1015 Lausanne, Switzerland
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 Record created 2006-06-15, last modified 2018-07-07


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