Axial Flux Interior PM (AFIPM) synchronous motors, as candidates for small electric city cars drives, are presented in this work. The motor parameters effects on the motor torque performance are examined by the analysis of the stator current trajectories in the (id-iq) plane. The AFIPM motor parameters are designed by this analysis to make the motor power capability matching the torque requirements, considering the inverter current and the DC voltage limits.
Furthermore, the voltage-limited optimum Torque per Ampere trajectory is drawn in the (id-iq) plane. It is shown that the proper choice of the motor parameters is a trade off between the parameters to get the ideal operating characteristic for the optimum control over a wide speed range and the parameters to get the high operating torque at low speed. Finally, some design considerations and the simulation results for a 180V (DC bus voltage), 10kW AFIPM synchronous motor drive for electric vehicles are presented.
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