1. Keep the permanent magnet motor working at rated current

Permanent magnet motor overload operation, the main reason is due to the drag of the load is too large, the voltage is too low, driven by the mechanical stuck. If the overload time is too long, the permanent magnet motor will absorb a large amount of active power the power grid, the current increases, the temperature rises, the insulation of the permanent magnet motor will age at high temperature, the magnetic steel will lose magnetism. Therefore, in the operation of the permanent magnet motor, it is necessary to pay attention to often check whether the transmission device is flexible reliable; Whether the concentricity of coupling is standard; The flexibility of the gear drive, etc. If it is found that there is a stuck card, it should be stopped immediately to find out the cause remove the fault before running.

2, often check the permanent magnet motor three-phase current balance

Three-phase AC permanent magnet motor, the difference between any phase current the average value of the other two currents is allowed to exceed 10%, so as to maintain the safe operation of the permanent magnet motor, if more than it indicates that the permanent magnet motor is faulty, must be identified.

3, check the temperature of the permanent magnet motor to often check the permanent magnet motor bearing, stator, shell other parts of the temperature is abnormal changes.

Permanent magnet motor bearing is overheated, lack of oil, if the temperature rise near the bearing is found to be too high, it should be stopped immediately to check whether the rolling body of the bearing, raceway surface cracks, scratches defects, bearing clearance is too large shaking, the inner ring on the shaft rotation. Any of the above phenomena must be updated before the bearing can be carried out.