What is the reason for the buzzing sound of the motor?

What is the reason for the buzzing sound of the motor?

There may be multiple reasons for the buzzing sound of a motor, and the following are some common reasons and their solutions:

Power issue:

Check if the power supply is normal, if the fuse is blown, and if the plug is loose. If there is a problem with the power supply, it is necessary to replace the fuse or repair the power socket.

Poor or damaged power cord connection, resulting in single-phase operation. Check if the power cord connection is secure and if the voltage is stable.

Bearing wear:

The wear of the internal bearings of the motor may cause difficulty in rotating the motor and produce a buzzing sound. In this case, it is necessary to replace the bearings with new ones.

Poor lubrication of bearings can increase friction and cause buzzing sounds. Ensure that the bearings are adequately lubricated.

Winding fault:

When there is a short circuit, open circuit, or grounding issue with the coil of the motor, the motor may not operate normally and produce a buzzing sound. This situation requires professional maintenance personnel to inspect and repair.

Excessive load:

Motor overload or excessive load may cause the motor to overheat, which may result in a buzzing sound but prevent it from rotating. At this point, the load should be reduced and the motor should be allowed to cool before attempting to start.

Damaged starting capacitor:

Damage to the starting capacitor of the motor may cause the motor to fail to start and produce a buzzing sound. A new starting capacitor needs to be replaced.

Mechanical jamming:

Parts such as the motor shaft or pulley are stuck by debris, causing the motor to be unable to rotate and producing a buzzing sound. Need to clean up debris to ensure smooth operation of the motor.

Protective device action:

The action of protective devices such as thermal protectors and current protectors may cause the motor to produce a buzzing sound but fail to rotate. It is necessary to check whether the protective device has malfunctioned, and if necessary, adjust or replace it.

electromagnetic interference：

Aging and damage of components such as electromagnetic coils and electromagnets may cause electromagnetic interference, leading to motor noise.

Controller issue:

The waveform output of the controller is irregular or the state is not ideal, which will have a negative impact on the working state of the motor and cause noise problems.

Resonance phenomenon:

When electric vehicles are driving at low speeds, resonance may occur in the body components, causing the motor to have the same frequency as other components, resulting in a buzzing sound.

Installation issues:

If the motor of an electric vehicle has a large volume and is not properly fixed or the fastening screws are too loose during installation, it may also cause the motor to produce vibration and noise during operation.

Motor quality issues:

If the quality of the motor itself is poor, such as poor manufacturing processes, unqualified materials, etc., it may cause the motor to produce noise during operation.
Based on the above reasons, we can investigate and solve the problems one by one. If the problem is complex or cannot be solved by oneself, it is recommended to seek the help of professional maintenance personnel.