Solution to earth permanent magnet motor winding short circuit

Previously, we have introduced in detail the precautions for the use of earth permanent magnet motors. It can be seen that when using this motor, you should pay attention to relevant rules and matters. For example, there are corresponding preparations before starting the motor, correct operation after starting, and regular checks to see if the voltage of the starting power supply meets the requirements.

In the motor industry, earth permanent magnet motors are a very important device. Once problems occur during operation, the impact will be huge. For example, earth permanent magnet motors sometimes have winding short circuits. Is there any good solution to this phenomenon? Let’s discuss it with the editor below!

Due to the influence of various factors, including excessive flow, excessive changes in power supply voltage, or various damages, etc., it is possible to cause a short circuit in the earth permanent magnet motor winding. If a winding short circuit is discovered, correct measures must be taken as soon as possible to avoid more serious consequences.

First, we need to determine the exact location of the short circuit. If it is a short circuit at the end, just use some insulating material to separate the short circuit point. The insulated wires can also be repackaged, painted and dried, and the situation will improve. If it is a short circuit in the wire trough, it is relatively troublesome. You must soften and find the short circuit point and repair it, then put it back into the wire trough and paint and dry it, so that the motor can run again.

Common faults of earth permanent magnet motors include many mechanical faults, such as sweeping, vibration, bearing overheating, damage and other faults. The air gap between the stator and rotor of an asynchronous motor is very small, which can easily cause the stator and rotor to collide. Generally, due to the wear of the inner hole of the end cover shaft or the wear and deformation of the end cover stop and the base stop, the base, end cover, and rotor are not axial, causing the bore to be swept.

Vibration should be distinguished whether it is caused by the motor itself, caused by a defective transmission device, or transmitted from the mechanical load end, and then eliminated according to the specific situation. Vibration caused by the motor itself is ly caused by poor dynamic balance of the rotor, poor bearings, bent shafts, or the end cover, base, and rotor are not axial, or the motor installation foundation is uneven, the installation is not in place, and the fasteners are loose. of. Vibration creates noise and creates additional loads.

The editor below will introduce in detail the solution to the winding short circuit of the earth permanent magnet motor:

Winding short circuits are caused by insulation damage caused by excessive motor flow, excessive changes in power supply voltage, mechanical bumps, poor manufacturing, etc. Among them, winding short circuits are divided into winding short circuits, winding pole short circuits, There are four types of short circuit between winding turns and short circuit between winding phases.

Because the earth permanent magnet motor has been working in an overloaded environment for a long time, the insulation ages and loses the insulation effect; when the winding is damp, the insulation resistance decreases and the insulation loses its corresponding function; the end of the earth permanent magnet motor If the insulation material between layers is not well padded or shaped, it must be softened , the short circuit point must be found and repaired, and then put back into the trunking for painting and drying. For each phase resistance of the short-circuit circuit breaker less than 1/12, when connecting turns in series, all short-circuit lines must be completely cut off, connected to the conductive part, and then formed into a closed loop for emergency use.