Servo motor heating can be caused by many reasons, here are some possible causes and solutions:
1. Motor overload: Although you say that the load is relatively light, it is still possible to overload.
Overloads can be caused by drive failure, mechanical failure, or low supply voltage. The solution is to check whether the load is normal, make sure the power supply voltage is within the specified range, check whether the drive is working normally, etc.
2. Motor drive failure: If the servo motor drive fails, it may also cause the motor to heat up.
The solution is to check that the bearing is working properly, and if necessary, replace it with a new bearing and add the right amount of grease.
3. Poor motor insulation: Poor motor insulation may also cause the motor to heat up. The solution is to check whether the insulation of the motor is normal, and if there is a problem, the motor needs to be repaired or replaced in time.
4. Motor overspeed operation: If the servo motor runs at excessive speed, it may also cause the motor to heat up. The solution is to ensure that the motor runs at a specified speed and does not overspeed.
In short, there are many reasons for servo motor heating, which need to be analyzed and investigated according to the specific situation.
If you are not sure how to deal with it, it is best to consult a professional technician or manufacturer for diagnosis and repair.
When doing the test, make sure that the motor runs within the specified range to avoid overload and overspeed operation, so as not to cause the motor to burn.