Troubleshooting the Motor

If the following types of sounds occur, it is considered abnormal:
(1) There is a "squeaking" sound when the bearing is running, which is a metal friction sound, usually caused by a lack of oil in the bearing. The bearing should be disassembled and added with an appropriate amount of lubricating grease.

(2) If there is a "chirp" sound, it is the sound made when the ball rotates, usually caused by the drying of lubricating grease or lack of oil. An appropriate amount of grease can be added.

(3) If there is a "clicking" or "creaking" sound, it is the sound generated by the irregular movement of the ball in the bearing, which is caused by the damage of the ball in the bearing or the long-term use of the motor, and the drying of the lubricating grease.

 

If the transmission mechanism and the driven mechanism emit continuous rather than fluctuating sounds, they can be handled in the following ways.

(1) Periodic "popping" sounds are caused by uneven belt joints.

(2) Periodic "thumping" sound is caused by loose coupling or pulley between shafts, as well as worn keys or keyways.

(3) The uneven collision sound is caused by the wind blades colliding with the fan cover.

 

By smelling the smell of the electric motor, faults can also be identified and prevented.

Open the junction box and sniff with your nose

Check if there is a burnt smell. If a special paint smell is found, it indicates that the internal temperature of the motor is too high; If a strong paste or burnt odor is found, it may be due to the breakdown of the insulation repair mesh or the burning of the winding.

If there is no smell, it is necessary to use a megohmmeter to measure the insulation resistance between the winding and the shell, which is less than 0.5 megawatts. Drying treatment must be carried out. A resistance value of zero indicates damage.

 

Touching the temperature of some parts of the motor can also determine the cause of the malfunction.

To ensure safety, the back of the hand should be used to touch the surrounding parts of the motor casing and bearings when touching.

If abnormal temperature is found, the reasons may include the following:

1. Poor ventilation. Such as fan detachment, blocked ventilation ducts, etc.

2. Overload. Causing excessive current and overheating of the stator winding.

3. Short circuit between stator windings or three-phase current imbalance.

4. Frequent starting or braking.

5.If the temperature around the bearing is too high, it may be caused by bearing damage or lack of oil.

 

Temperature regulations for motor bearings, causes of abnormalities, and solutions

The regulations stipulate that the maximum temperature of rolling bearings shall not exceed 95 ℃, and the maximum temperature of sliding bearings shall not exceed 80 ℃. And the temperature rise shall not exceed 55 ℃ (the temperature rise is the bearing temperature minus the ambient temperature during testing).
 

Reasons and solutions for excessive temperature rise of bearings:

(1) Reason: The shaft is bent and the centerline is not accurate. Handling: Find the center again.

(2) Reason: The foundation screws are loose. Handling: Tighten the foundation screws. (3) Reason: The lubricating oil is not clean. Treatment: Replace the lubricating oil.

(4) Reason: The lubricating oil has been used for a long time and has not been replaced. Treatment: Clean the bearings and replace the lubricating oil.

(5) Reason: The ball or roller in the bearing is damaged. Handling: Replace with a new bearing.
 

Resolvent:

1. Open the module cover and replace any damaged components such as fuses and charging resistors in the module.

2. Replace the damaged optical circuit board or protective diode.

3. The optical fiber is connected normally according to the markings, and if the optical fiber is damaged, it should be replaced.

4. Replace the module power board.

 

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