Optimization of PM volume in a PM-assisted claw-pole motor for ISG applications

Claw-pole motor has naturally 3D structure, because of the structural complexity. However, it was simplified as a 2D model by linear approximation. The rotor model of PM-assisted claw-pole motor has permanent magnets, as well as a field winding. Then an electric equivalent circuit is developed with a current source and a voltage source. Further, the rotor core saturation problem is treated with a nonlinear resistance (reluctance) which depends on the field current. The resistances are obtained from 3D FEM results, and used for computing an optimal PM volume. A real machine was constructed based on the computation results, and tested in a dynamo with an inverter.