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.
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。
Industry trends lean toward lower output voltages, more power, tighter power regulation, and faster response to changes in load current.
业界之发展趋势是要求更低的输出电压、更大的功率、更有效控制电源、以及对负载电流的转变有更快速的反应。
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.
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。
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