不同电流波形下永磁推进电机电磁转矩的时步有限元计算

Electromagnetic torque calculation of twelve phases PM propulsion motor with different currents by using time-stepping finite-element method

以12相永磁推进实验样机为研究对象,介绍了其结构特点及运行控制模式,建立了该电机的时步有限元仿真系统。采用有限元法对正弦波、方波、梯形波电流波形下的永磁推进电机电磁转矩进行了数值计算,给出了不同电流下的功角特性曲线。研究结果表明,对于电枢反应较强的12相永磁推进电机,在通常功角范围内通入正弦波电流可产生较大电磁转矩。

As for PM propulsion motor supplied by frequency converter, using what kind of current to produce max electromagnetic torque is very important for its design and control. With a twelve phases PM test motor as the subject investigated according to its structural features and running mode, a simulation system was established for time-stepping finite-element method （FEM）, the electromagnetic torque of this motor operating under sine wave, square wave or trapezoidal wave current was calculated with step-time finite element method, and the power-angle curves of this motor under different currents were given. The result shows that the sine wave current can produce max electromagnetic torque under usual power angle range for this twelve phases PM propulsion motor with strong armature reaction.