1. Know the thermistor resistor
Thermistor resistor is a type of sensitive components, according to the temperature coefficient is divided into positive temperature coefficient resistor (PTC) and negative temperature coefficient thermistor (NTC). Thermistor resistor is generally used for overheating protection of household appliances, mainly the electrical temperature measurement, and automatically disconnect the circuit to form protection when it is overheated. We can see thermistor resistors in air conditioners and induction cookers. For example, in outdoor environments, thermistor resistors mainly determine the high operating frequency of the indoor compressor (for example, when heating, if the outdoor temperature is higher, the high frequency will be controlled. ). The motor thermistor of the rice cooker is to control the temperature of the rice cooker. On the one hand, it is controlled not to overheat, and on the other hand, it is convenient for it to switch to the heat preservation state when the rice is cooked.
2. The working mode of thermistor resistor in the motor
The thermistor resistor installed in the motor is usually installed close to the motor winding, in order to monitor the temperature rise of the motor winding. Generally, the negative temperature coefficient of the thermistor resistor is used. When the winding temperature rises due to the motor overload, the resistance value of the thermistor resistor will decrease. When the resistance value drops to a certain value due to the temperature rise (this value is set basing on the motor characteristics or application requirements), it will cause the control circuit to act to cut off the motor circuit, stop the motor from working, and protect the motor.
With the development of science and technology, the application fields of our electronic components are becoming wider and wider, and the requirements for quality are constantly improving. When purchasing thermistor resistor, remember to choose a guaranteed manufacturer. In the product selection of thermistor resistor, the product series should be selected according to the rated voltage and filter capacitance value, and the resistance of the thermistor resistor should be selected according to the allowable large starting current value of the product and the working current of the thermistor resistor loaded for a long time. At the same time, the temperature of the working environment should be considered, and the derating design should be appropriately carried out.
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