1. Keep the permanent magnet motor working at rated current

The main reasons for the overload operation of the permanent magnet motor are due to the excessive load being driven, the voltage being too low, or the driven machinery being stuck. If the overload time is too long, the permanent magnet motor will absorb a large amount of active power from the power grid, the current will increase, and the temperature will rise. At high temperatures, the insulation of the permanent magnet motor will age and the magnets will lose magnetism. Therefore, when the permanent magnet motor is in operation, attention should be paid to frequently checking whether the transmission device is flexible and reliable; whether the concentricity of the coupling is standard; the flexibility of the gear transmission, etc. If stuck phenomenon is found, the machine should be stopped immediately to find out the cause and eliminate the fault before running again.

2. Always check whether the three-phase current of the permanent magnet motor is balanced

  For a three-phase AC permanent magnet motor, the difference between any one phase current of the three-phase current and the average value of the other two currents is not allowed to exceed 10%. Only in this way can the safe operation of the permanent magnet motor be maintained. If it exceeds, it indicates that the permanent magnet motor is faulty and must be checked. bright.

3. Check the temperature of the permanent magnet motor. Always check the temperature of the bearings, stator, shell and other parts of the permanent magnet motor for abnormal changes.

Check whether the bearings of the permanent magnet motor are overheated and lack of oil. If the temperature rise near the bearing is found to be too high, stop the machine immediately and check whether there are cracks, scratches or defects on the surface of the rolling elements and raceways of the bearing, and whether the bearing clearance is too large and shaking. Whether the inner ring rotates on the shaft, etc. If any of the above phenomena occur, the bearings must be updated before work can be resumed.