When the motor is raised slowly, the surface temperature of the case quickly exceeds 85 ° C. Continue to run. The automatic protection of the motor will stop working. The insulation resistance of the three -phase winding of the motor stator is greater than 105MΩ, and the power supply voltage is 398V; the brake wheel and brake seat wear normally. In addition, when it was started and stopped, the lift motor was dull and noisy. The positioning was not accurate when the loaded heavy objects, and the error generated by the positioning was too large.

For further inspection of the brake. Remove the fan wheel and the fan wheels on the electric motor shaft to apply a certain load to the lift motor. It is found that the axial displacement of the motor runs in the middle shaft is less than 0.5mm. Therefore, it can be determined that the brake work is abnormal. The stator and rotor of the motor uses a cone -shaped coordination. If the axial displacement of the motor rotor is small, it will cause the brake wheel and brake seat to not be completely removed, resulting in a large working current after the motor is powered on, which will cause the motor to overheat. The axis displacement of the normal motor is 1.0-1.5mm. After adjusting it to 1.2mm, install the fan wheel and fan cover, start the motor, and no automatic protection shutdown does not occur during slow lifting. After working for a period of time, touch the temperature of the motor shell with your hands and the fault disappears.