正弦变量
In virtue of variation theory, boundary problem of magnetic field is changed into equivalent variable problem. Then the procedure of element analysis, discrete format and collective composition equation in sinusoidal and time-varying field are given.
从待解的磁场边值问题出发,利用变分原理将边值问题转化为等价的变分问题,给出了正弦时变场单元分析过程和离散格式以及最终的总体合成方程。
In variable-frequency drives of AC motor, it needs to control the relevant variables to ensure three-phase equilibrium of the sinusoidal input current in order to keep the electromagnetic torque of AC motor constant.
异步电机的变频调速,需要控制相关变量,保证异步电机输入三相平衡的正弦电流,这样才会合成恒定的电磁转矩。
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