关键词: 永磁同步电机, SVPWM, 非线性电感参数, 电流时间谐波, 损耗

Abstract:

In order to simulate the precise calculation of iron loss and magnet eddy loss based on inverter variable speed permanent magnet synchronous motor ,the nonlinear inductance parameters and vector control technology were adopted to build performance simulation platform for motor system, and the loss technology of high density permanent magnet synchronous motor based on SVPWM vector control was researched. A 48-slot 8-pole high density permanent magnet synchronous motor was taken as an example to study the influence of inverter current time harmonic on iron loss and magnet eddy loss of the motor, simulation was carried out on the relationship between inverter parameters and stator current distortion rate. Simulation analysis showed that: current time harmonic was the main factor to generate eddy current loss of permanent magnet; the current time harmonic had large influence on iron core eddy current loss, and small effect on the iron core hysteresis loss; in a certain range when carrier and modulation ratio increased, the current distortion rate decreased with the reduction of the iron loss and permanent magnet eddy current loss. Compared with the sine wave power supply, loss calculated by the inverter power supply simulation was more close to the experimental data of the prototype, which further verified the accuracy of the simulation analysis method.

Key words: permanent magnet synchronous motor, SVPWM, nonlinear inductance parameters, current time harmonic, loss