For a motor, its life red is very limited, so we need to know more about this knowledge before we can better protect him and extend its service life.When the temperature is used to protect the motor, the built-in thermal sensor is used for protection. When the temperature is too high, a signal is provided for protection through an external control loop. Or use thermistor, thermoelectric measuring the temperature of the motor through the temperature controller to give an overheating signal to protect the motor.

Use a current transformer to measure whether the three-phase zero sequence of the motor's incoming line is zero, which is generally used for motors with higher power. The specific method is: select a suitable current transformer according to the power of the motor and install it at the input end of the motor control box.

There are two main methods for protecting the motor. One is to use built-in thermal sensors for protection, and the other is to choose a suitable current transformer based on the power of the motor and install it at the input end of the motor control box. Both methods work.