Fault detection method of permanent magnet motor

The permanent magnet motor has attracted much attention and praise in the motor industry. Because it is better than some ordinary motors, it has been vigorously promoted and used by the country. However, when using this motor, don't forget to perform regular maintenance on the permanent magnet motor. If it is not maintained regularly, some faults will inevitably occur. So how should we detect the faults of the permanent magnet motor? Let’s discuss it with the editor below!

The fault detection methods of permanent magnet motors are as follows:

1. Listen to the sound , and then carefully find the fault point

During the operation of the permanent magnet motor, if it emits a thin "buzzing" sound without any changes in high or low, it means that this is a normal sound. If the sound sounds thicker and has a sharp " "Buzzing" or "hissing" sounds indicate that this is a precursor to a malfunction. At this time, you should consider the following reasons:

(1) Iron core is loose

The vibration of the permanent magnet motor during operation and the sudden changes in temperature will cause the iron core fixing bolts to deform, causing the silicon steel sheets to loosen and generate large electromagnetic noise.

(2) Rotor noise

The sound produced by the rotation of the rotor is produced by the cooling fan. It is a "whining" sound, which sounds like the "dong-dong" sound when beating a drum. This is the sudden start, stop, and reverse connection of the permanent magnet motor. In the case of speed changes such as moving, the acceleration torque causes the fit between the rotor core and the shaft to loosen. In mild cases, it can continue to be used, but in severe cases, it needs to be disassembled for inspection and repair.

(3) Bearing noise

When the permanent magnet motor is running, we must pay attention to the changes in the bearing sound. We also need to touch one end of the screwdriver to the bearing cover and the other end to the ear. At this time, you can hear the changes in the sound inside the motor. Different Parts, different faults, have different sounds.

For example, the "squeaking" sound is caused by the irregular movement of the roller gun in the bearing, which is related to the clearance and grease state of the bearing. The "sizzling" sound is the sound of metal friction, which is generally caused by the bearing being short of oil and grinding. We should disassemble the bearing and then add grease to it.

2. Use your sense of smell to analyze faults

Permanent magnet motors have no peculiar smell during normal operation. If you smell a peculiar smell, it is a fault signal, such as a burnt smell. This smell is emitted by the insulator being grilled, and as the temperature of the motor continues to increase, , in severe cases, there will be smoke; if it smells like oil and coke, it is ly caused by the lack of oil in the bearing, and the peculiar smell occurs when the oil vapor evaporates when it is close to dry grinding.

3. Use touch to check faults

We can use our hands to touch the casing of the permanent magnet motor to roughly judge the temperature rise. If the motor casing feels very hot and the temperature value is very high as soon as we touch it with our hands, we should check the reasons. For example, it may be these Caused by: overload, excessive voltage, etc., and then troubleshoot the cause.