Concerning the calculation of AC loss in the motor winding with harmonic current within the inverter power supply system

a 60 kW permanent magnet synchronous motor(PMSM)was taken as an example and a harmonic current method for calculating the AC loss of the motor winding in the inverter power supply system was put forward. Firstly

the motor stator current under the inverter power supply system was decomposed by means of the harmonic analysis method as the external circuit excitation of the motor finite element model

and the AC loss of the motor winding was computed by adopting the 2D finite element model coupled with the external circuit method. Secondly

a joint simulation was carried out on the finite element model of the PMSM and the inverter drive system controlled by the maximum torque per ampere(MTPA). The winding currents under three typical working conditions

namely low speed

rated speed

and peak speed of the motor

were acquired through the simulation. Finally

based on the winding currents obtained from the simulation

the AC losses of the three working conditions were calculated using the harmonic current method. The maximum relative error between the calculation results of this calculation method and those of the input method with harmonic current sources is 2.9%

and the calculation speed is increased by 4 times. Eventually

the validity of the joint simulation and the accuracy of the loss calculation results were verified through the prototype experiment.