这是因为电励磁的同步电动机可通过调节励磁电流来改变其磁场和功率因数，使输出的机械特性与负载特性相匹配。
Synchronous motor excitated magnet by direct current can make output mechanism specialities matched load specialities by means of adjusting exciting current to change magnetic field and power factor.
生产型高梯度磁选机激磁功率大且为大电感性负载，其供电系统输出电流很难稳定。
High Gradient Magnetic Separator for production needs high exciting power and its inductive load is great. The stabilization of output current from power supply system is difficult.
经过实验验证，对于正弦波、三角波和方波，负载输出电流波形跟踪良好。
For sine wave, triangle wave, and square wave, the good performance of current output is proved by experiments.
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