近几年来,应用热敏电阻保护矿用电动机的研究工作有了一定的进展,迄今已出现了多种不同型式的热敏电阻保护电路。这些电路按功能分:有动作于操作回路切断电源和发出报警信号两种;按执行电路的方式分:有继电接点式和无触点式,按测温电路的不同可分为温度讯号不经放大直接作用于控制回路和温度讯号经 In recent years, there has been some progress in the research work of using thermistors to protect mining motors. So far, many different types of thermistor protection circuits have appeared. These circuits by function points: there are actions in the operating circuit to cut off the power and alarm signals are two; according to the way the implementation of the circuit: a relay contactless and non-contact type, according to the temperature measurement circuit can be divided into different temperature signal The amplification directly affects the control circuit and temperature signal