The results show that the induction heat power of magnetic field amplitude-modulated with sine wave and square wave is unrelated to the frequency of modulating wave.

结果表明：方波和正弦波调幅磁场的感应热功率都与调幅波频率无关。

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For square wave motor, the thesis set forth equivalent weakening magnet field control way by use of transformer electric potential to...

对方波电机，文中提出了一种新型的用变压器电势抵消激磁电势而实现的等效弱磁控制方法，并作了理论分析与实验验证。

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