Optimal design of IPM-PMASR motors for wide constant power speed range applications

The design of an IPM-PMASR machine represents a trade off between the magnet quantity and the realization of a high anisotropic rotor structure. The better the obtained anisotropy is, the lower the required magnet quantity is. The magnet addition always affects in a positive manner both power factor and machine torque. However, when a large CPSR is required, a low magnet quantity also allows a safe operation at high speed, where a sudden overvoltage could appear in case of inverter fault. For this reason, the rotor anisotropy has to be maximized.

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