Causes and solutions of servo motor overheating

As we all know, servo motor refers to the engine that controls the operation of mechanical components in the servo system. It is an indirect transmission device that assists the motor. However, during use, the servo motor may experience temperature rise problems and overheating. As for the temperature rise problem of the servo motor, we have introduced in detail how to improve it before. So what are the causes and solutions of the overheating of the servo motor? Let’s learn together below!

The rotor inside the servo motor is a permanent magnet. The U/V/W three-phase electricity controlled by the driver forms an electromagnetic field. The rotor rotates under the action of this magnetic field. At the same time, the encoder of the motor feeds back a signal to the driver. The driver communicates with the target according to the feedback value. Compare the values ​​and adjust the rotor rotation angle. The accuracy of the servo motor depends on the accuracy (number of lines) of the encoder.

The reasons why the servo motor overheats are as follows:

1) The load is too large;

2) Missing items;

3) The air duct is blocked;

4) Low speed running time is too long;

5) The power supply ripple is too large.

The solutions to servo motor overheating are as follows:

According to the working principle of the servo motor, if you want to reduce the heating phenomenon of the motor, you need to reduce the copper loss and iron loss.

There are two directions to reduce copper loss, reducing resistance and reducing current. This requires us to try to choose a motor with a smaller specific current when selecting a model. For two-phase motors, if the motor can be connected in series, there is no need to connect the motor in parallel. But this often conflicts with the requirements of torque and high speed.

For the selected motor, you should make full use of the driver's automatic half-current control function and offline function. The former automatically reduces the current when the motor is in a static state, and the latter simply cuts off the current. In addition, because the current waveform of the subdivided driver is close to sinusoidal and has less harmonics, the motor will generate less heat. There are not many ways to reduce iron loss. The voltage level is related to iron loss, so the appropriate driving voltage level should be selected while taking into account high speed, stability, heat generation, noise and other indicators.