In the actual application process of the motor, many factors can lead to the failure of the motor. This article lists the five most common reasons. Let’s take a look at which five? The following is a list of common motor faults and their solutions.
Overheating is the biggest culprit of motor failure. In fact, the other four reasons listed in this article are on the list in part because they generate heat. Theoretically, the life of the winding insulation is halved for every 10°C increase in heat. So, making sure the motor is running at the right temperature is the best way to extend its life.
2. Dust and pollution
Various suspended particles in the air will enter the motor and cause various hazards. Corrosive particles can wear components , and conductive particles can interfere with component current flow. Once the particles block the cooling channels, they will accelerate overheating. Obviously, choosing the correct IP protection level can alleviate this problem to a certain extent.
3. Power supply problem
Harmonic currents caused by high frequency switching and pulse width modulation can cause voltage and current distortion, overload and overheating. This shortens the life of motors and components and increases long-term equipment costs. In addition, the surge itself can cause the voltage to be too high and too low. To solve this problem, the power supply must be continuously monitored and checked.
4. Damp
Moisture itself can erode motor components. When moisture and particulate pollutants in the air are mixed, it is fatal to the motor and further shortens the life of the pump.
5. Improper lubrication
Lubrication is a degree issue. Excessive or insufficient lubrication can be harmful. Also, be aware of contamination issues in the lubricant and whether the lubricant used is suitable for the task at hand.
These problems are all interrelated, and it is difficult to solve one of them in isolation. At the same time, these problems also have one thing in common: if the motor is used and maintained correctly, and the environment is properly managed, these problems can be prevented .
The following will introduce to you: common faults and solutions of motors
1. The motor is turned on and started, but the motor does not turn but there is a humming sound. Possible reasons:
①Single-phase operation is caused by the connection of the power supply.
②The carrying capacity of the motor is overloaded.
③It is stuck by the dragging machine.
④ The rotor circuit of the wound motor is open and disconnected.
⑤ The position of the internal head end of the stator is wrongly connected, or there is a broken wire or a short circuit.
Corresponding processing method:
(1) It is necessary to check the power line, mainly check the wiring and fuse of the motor, whether there is any damage to the line.
(2) Unload the motor and start it with no load or half load.
(3) It is estimated that it is due to the failure of the towed device. Unload the towed device and find the fault from the towed device.
(4) Check the engagement of each contactor of the brush, slip ring and starting resistor.
(5) It is necessary to re-determine the head and tail ends of the three-phase, and check whether the three-phase winding is disconnected or short-circuited.
2. After the motor starts, the heat exceeds the temperature rise standard or the smoke may be caused by:
① The power supply voltage does not meet the standard, and the motor heats up too fast under the rated load.
②The influence of the operating environment of the motor, such as high humidity.
③ Motor overload or single-phase operation.
④ Motor start failure, too many forward and reverse rotations.
Corresponding processing method:
(1) Adjust the motor grid voltage.
(2) Check the operation of the fan, strengthen the inspection of the environment, and ensure that the environment is suitable.
(3) Check the starting current of the motor, and deal with the problem in time.
(4) Reduce the number of forward and reverse rotations of the motor, and replace the motor that is suitable for forward and reverse rotation in time.
3. Possible reasons for low insulation resistance:
①Water enters the motor and gets damp.
②There are sundries and dust on the windings.
③ The internal winding of the motor is aging.
Corresponding processing method:
(1) Drying treatment inside the motor.
(2) Deal with the sundries inside the motor.
(3) It is necessary to check and restore the insulation of the lead wires or replace the insulation board of the junction box.
(4) Check the aging of the windings in time and replace the windings in time.
4. Possible reasons for the electrification of the motor housing:
①The insulation of the motor lead wire or the insulation board of the junction box.
②The winding end cover is in contact with the motor casing.
③ Motor grounding problem.
Corresponding processing method:
(1) Restore the insulation of the motor lead wires or replace the insulation board of the junction box.
(2) If the grounding phenomenon disappears after removing the end cover, the end cover can be installed after insulating the winding end.
(3) Re-ground according to regulations.
5. Possible reasons for abnormal sound when the motor is running:
①The internal connection of the motor is wrong, resulting in grounding or short circuit, and the current is unstable and causes noise.
②The inside of the motor has been drawn into disrepair for a long time, or there are debris inside.
Corresponding processing method:
(1) It needs to be opened for a comprehensive inspection.
(2) It can handle the extracted debris or replace it with 1/2-1/3 of the bearing chamber.
6. Possible causes of motor vibration:
①The ground where the motor is installed is uneven.
②The rotor inside the motor is unstable.
③ The pulley or coupling is unbalanced.
④Bending of the inner rotor.
Corresponding processing method:
(1) The motor needs to be installed on a stable base to ensure balance.
(2) The rotor balance needs to be checked.
(3) The pulley or coupling needs to be calibrated and balanced.
(4) The shaft needs to be straightened, and the pulley should be aligned and then fitted with a heavy truck.
Post time:
Jun-14-2022