必须保护感应电动机，防止过载和欠压。
It is necessary to prevent induction motors against overload and undervoltage.
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。
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.
通过分析刮板输送机的过载机理，对电动机冲击力矩有了更深入的认识。
Thorough understanding of impact force of motor is achieved through analyzing the overload mechanism of armored face conveyor.
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