一种乘用车引擎冷却风扇电机热保护设计与试验

摘要

Cooling fan motor thermal protection design of the passenger car engine is a complex mechanical, electrical, thermal coupling system. To analyze and research such a complex system, the key is to establish the mathematical model of the system. The paper first introduces the DC motor mathematical model of heat, the cumulative and hot divergence system, and gives the protection design of the motor startup process such as motor overload protection, stall protection and short circuit protection. At the same time, the paper proposes some aspects of the thermal protection WphR (S) and methods of setting. Then, the paper also proves the test result of the thermal protection system, which shows the designing reliability for the motor thermal protection.%　　乘用车引擎冷却风扇电机热保护设计是一个复杂的机、电、热耦合系统，分析、研究这样一个复杂系统，建立系统的数学模型是关键。文章首先介绍直流电机的热累积和热发散系统数学模型，并给出电机过载保护、电机启动过程、堵转保护、短路保护等热保护设计方案，同时设计了热保护环节WphR(S)和设定方法。在文章结尾处，对于电机热保护方案进行试验验证，证明该热保护系统设计合理，运行可靠。