How to repair a two-phase motor that does not rotate and buzzes after being powered on

How to repair a two-phase motor that does not rotate and buzzes after being powered on

If a two-phase motor does not turn and makes a humming sound after being powered on, the motor may be damaged or the power supply may be insufficient. Here are some possible repair steps:

Check the power supply: Make sure the power supply is stable and the voltage and frequency match the motor identification. If the voltage is insufficient or the frequency deviates too far, the motor may not start properly.

Check the motor windings: Check whether the motor windings are normal and whether there is a short circuit or open circuit. Use a multimeter to test the insulation resistance of the motor windings. If the resistance is too low or close to zero, the motor may have a short circuit problem.

Check the motor rotor: Check if the motor rotor is running properly, stuck or worn. You can rotate the motor rotor manually to check for resistance or unevenness.

Check the motor switch: If the motor is equipped with a switch, you can check whether the switch is normal and whether there is a contact problem. You can use a multimeter to test whether the switch is conductive to determine whether the switch is working properly.

If the above steps cannot solve the problem, it is recommended to ask professionals to perform inspection and maintenance.

Two-phase motor maintenance precautions:

In daily use and work, due to the working characteristics of the shaft, rust, dirt and other conditions may occur. If these conditions are serious, it will directly lead to faults such as the motor not starting, blocking or unable to rotate. During maintenance, you should first use a soft brush to clean the dirt on the surface, then wrap the shaft with fine sandpaper, and evenly rotate the fine sandpaper by hand or directly wipe it with sandpaper to remove rust and impurities on the shaft surface.

During the operation of a brushed motor, the brushes need to be in contact with the commutator. Therefore, in the process of the motor rotor driving the commutator to rotate, the brushes will be worn to a certain extent. The carbon powder worn off the brushes can easily accumulate on the brushes and brush holders. This requires motor maintenance personnel to regularly clean the brushes and brush holders to ensure the normal operation of the motor.

During maintenance, it is necessary to check whether the brush leads have changed color. This will help you understand whether the brush is overloaded, the resistance is too high, or the connection between the wire and the brush body is poor, which will help prevent failures in a timely manner.

Why does the two-phase motor not rotate when idling or under load?

A two-phase motor can rotate normally when idling, but cannot rotate when loaded. This may be due to the following reasons:

Capacitor failure: The starting and running of the two-phase motor requires the help of capacitors. If the capacitor is damaged or fails, the motor will not start or run normally. A new capacitor needs to be replaced.

Bearing failure: If the motor bearing fails, it will increase friction, increase the motor's running resistance, and cause the motor to fail to rotate normally. New bearings need to be replaced.

Motor winding damage: If the motor winding is faulty, such as broken wire or short circuit, the motor will not operate normally. The motor winding needs to be repaired or replaced.

Mechanical failure: Failure of the mechanical part of the two-phase motor, such as mechanical jamming or shaft bending, may cause the motor to not operate normally. The mechanical part needs to be repaired or replaced.

Therefore, each possible failure point needs to be carefully examined to determine the cause of the problem and repair it.