What are the types of protection of the motor and what is the role?

May 10, 2019

What are the types of protection of the motor, and what is the role?


Motor protection types include motor protection, differential protection, and overload protection.

Motor protection provides comprehensive protection for the motor: overload, phase loss, stall, short circuit, over-voltage, under-voltage, leakage, three-phase unbalance, overheating, bearing wear, and stator eccentricity axial sway. When jumping, it will be alarmed or protected; the device that protects the motor is the motor protector, including the thermal relay, the electronic protector, and the intelligent protector. The significant and vital engines generally adopt smart protection devices.

Motor differential protection with differential quick-break protection and dual ratio differential protection with or without second harmonic braking. It can be used for three-side differential current input (three-turn), with the simulation of voltage and current of primary equipment. Complete and powerful acquisition function of the quantity and switch quantity, equipped with standard RS485 and industrial CAN communication port, and realize three-turn primary change differential protection, two-turn primary change differential protection, two-turn distribution differential protection, power generation through reasonable configuration Protection and measurement and control functions such as differential protection, motor differential protection and non-electricity protection;

The coil of a micromotor is usually made of a fragile copper wire and has a low current withstand capability. Therefore, when the motor load is large or the motor is stuck, the current flowing through the coil will increase rapidly, and the temperature of the motor will rise sharply, and the copper wire winding will quickly burn. If the polymer PTC thermistor can be connected in series with the motor coil, it will provide timely protection when the motor is overloaded to prevent the motor from being burnt. The usual protection circuit is shown below. The thermistor is usually placed near the coil so that the thermistor is more susceptible to temperature and makes the protection more efficient and effective. Thermistors used for primary protection are usually KT250 type thermistors with high withstand voltage. The thermistors for secondary protection are usually KT60-B, KT30-B, KT16-B with lower withstand voltage. And chip motor.


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