What conditions can motor fault detection detect?

The motor fault detection analyzer adopts single-chip technology, integrates data acquisition and spectral analysis, and uses advanced fuzzy discrimination technology and grey system clustering analysis method to automatically analyze common faults of rotating machinery.

After the motor starts, it buzzes: If the voltage at the motor terminal is normal, but the current is too high or exceeds the rated value (as indicated on the motor nameplate). This type of malfunction is usually caused by overload. At this time, the load carried by the motor should be disconnected, and the motor should be tested empty to see if it is normal. If it is normal, it is caused by load jamming or other reasons. Otherwise, it is caused by damage to the motor bearings or stator sweeping.

Sometimes the main circuit breaker trips due to severe motor heating: this is mainly caused by short circuits in the motor winding or winding. At this point, we need to disconnect the power cord of the motor, tighten the nut on the terminal, and use a multimeter to check if the three-phase resistance is balanced. In most cases, the change in resistance value is caused by a short circuit between the turns of the factor, or by a broken winding of a certain phase causing disconnection.

Of course, motors with a resistance greater than 11 kilowatts have very low resistance and are difficult to accurately measure with a multimeter. It is necessary to use an electric bridge for testing. A three-phase resistance error of less than 5% is considered normal, otherwise the motor will have a fault. At the same time, a megohmmeter (also known as a megohmmeter) should be used to test the insulation of the motor, and the insulation resistance of the winding to ground should be greater than 0.5 megohms before use. If the motor does not have a burnt smell but only experiences insulation degradation caused by moisture, it can continue to be used after baking.

In practical work, there is a situation where the motor is not damaged and can be tested normally, but it cannot carry the load. This is because the motor itself is aging and cannot continue to be used; It should also be noted that after the motor malfunctions, if the motor itself is still in a high heat state, it is difficult to measure the resistance accurately. It can only be measured after cooling to room temperature, and motor fault detection is needed at this time.