基于发热-散热积累模型的电动机过载保护研究

对异步电动机发热与散热机理进行分析，利用傅氏算法建立了电机热积累-散热的动态数学模型。仿真分析该模型，证明本模型可准确连续模拟电机温升动态变化情况，对避免电动机因定子绕组，转子绕组，定子铁心温度过高而造成损坏提供最优判据。通过与传统反时限保护进行对比，验证了本模型对负载变化引起的热积累反应更准确，敏锐。并在此基础上设计了以ARM芯片LPC2131为主控单元的智能保护器，经过长时间现场运行证明了本方案的可行性。

Study on motor over-load protection based on heat accumulation-emission model

This paper analyzes heat accumulation-emission of asynchronous motor,then establishes a dynamic mathematical model by discrete Fourier transform. It can reflect dynamic changes of motor thermal accurately and continuously,so as to prevent thermal rising too high felicitously. Compared with traditional inverse-time protection,the model can reflect heat accumulation caused by load changes more accurately and more acutely. An intelligentized protector using ARM IPC2131 is designed based on the model. A long ti...