Based on the method of solving heat balance differential equation, a novel over-load protection criterion for electric motor is presented in the paper considering the heat accumulation of motor.
以热保护为研究对象，充分考虑了电机的热积累现象，通过求解热平衡微分方程的方法，给出了新的电动机过载保护判据。
And, the equivalent current algorithm for the electric motor heat accumulation is proposed based on the symmetrical component method.
同时根据对称分量法的基本原理，提出以等效电流作为电动机热积累计算的依据的算法。
A water cooling method was also developed to control the heat accumulation during forming.
并采用循环水冷的温控措施解决了成形过程的过热问题。
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