When a motor fails to operate properly, to repair it, it must be checked in a certain procedure, that is, several tests must be done systematically to find the root cause of the fault. After these tests, it is determined whether the motor only needs minor repairs or part or all of the windings need to be rewound.

Check steps:

(1) Check the condition of the motor parts, such as whether the end cover is cracked, whether the shaft is twisted, whether the contacts are burned or broken, etc.

(2) Check the bearing condition. Shake the shaft up and down. If the shaft feels loose, it means the bearing is damaged. Turn the rotor by hand to see if it runs smoothly. If the shaft does not rotate normally, it means there may be a problem with the bearing, or it may be caused by the bending of the shaft or poor assembly. No matter what the root cause is, when the motor is connected to the power supply, it is likely to cause the fuse to burn out.

(3) Check the internal wiring of the motor to see if there is any contact between the coil and the rotor or stator. This test is called a ground test.

(4) When the rotor runs smoothly, connect the motor to the power supply and close the switch for a few seconds. If there is a problem inside the motor, it is likely that the fuse will burn out, the winding will smoke, the motor will rotate slowly, or it will make noise or stop moving. This phenomenon often indicates that the winding has a problem or has burned out. In this case, you need to remove the end cover and carefully check the winding parts inside the motor. If the winding is severely burned out, you can tell from the appearance of the winding.

After the above steps, the fault can be basically determined. Then further inspection of the part can find out the fault and make corresponding repairs.