How to solve the abnormal noise and short circuit of DC permanent magnet motor

In the previous article, we have learned about the emergency stop control requirements of DC permanent magnet motors. From this, we can see that in order to solve the problems of this motor, we need to know the characteristics of its load and the specific requirements for use.

However, the faults of DC permanent magnet motors can be said to be various. There are all kinds of faults. Today, the editor will introduce in detail how we should solve the problem of abnormal noise and short circuit in DC permanent magnet motors. Let’s learn together below!

If there is no axial movement of the armature causing a collision, it should be that the structural parts are loose. Please remember one principle: do not remove the gaskets on the magnetic poles easily, as it will affect the performance and operating status of the motor.

For the problem of abnormal noise of DC permanent magnet motors, the following analysis methods are available:

Connect the power supply of the electric control system of the motor to the oscilloscope to see if there is any missing wave head in the waveform. Vibration and noise can be generated when the phase is missing. Secondly, whether the compensation coil and the armature wire are connected reversely. Check again, and if it still doesn't work after trying again, it should be because the magnetic circuit is too strong and there is electromagnetic noise. You can drive the motor to the rated speed to see if it is within the range, and then cut off the power supply (the armature and excitation are cut off at the same time) and see if Is there any noise during the deceleration process? If not, it can be determined to be electromagnetic noise. If not, it should be a mechanical problem.

After the DC permanent magnet motor runs for a long time, a large short-circuit current will be generated in the short-circuited coil, which will then cause the coil to heat up quickly and burn out. When this kind of fault occurs in the motor, we should solve it as follows:

1. When the short-circuit point is at the end, the short-circuit point can be separated by insulating material, or the insulated wire can be re-wrapped, painted and dried;

2. When the short circuit is in the wire trough, you can soften the wire, find and repair the short circuit point, then put it back into the wire trough and paint it to dry;

3. When the short-circuit turns of each phase winding of the DC permanent magnet motor are less than 1/12, all the short-circuit lines of the series turns can be cut off and the conductive parts can be connected to form a closed loop for emergency use;

4. When the number of turns at the short-circuit point of the winding exceeds 1/12, all must be removed and rewound.

When a DC permanent magnet motor has a winding short circuit, everyone should promptly find the location of the short circuit point and take the above measures to deal with it, so as not to affect the normal use of the motor.

To sum up, when you use DC permanent magnet motors in the future, you must ensure that every use is performed in the correct operation. We must not forget to perform regular maintenance on it. This is also to prevent or reduce problems. way to appear.