Analysis on the reason of gear reducer shell electrification

1, the power cord and grounding wire wrong

2, the stator winding insulation damage caused by leakage. The reasons are: three-phase asynchronous motor, the use of time is too long, stator winding insulation aging; or a foreign body into the interior of the motor stator winding insulation damage; or the motor winding is scheduled to make long-term overload fever; or the supply voltage exceeds the rated voltage of motor stator winding insulation breakdown. These may cause the motor to be charged. In addition, if the environment around the motor is wet, or the motor in the rain and snow, water droplets into the motor inside; or because of the erosion of harmful gases. These will make the three-phase winding insulation performance is reduced (insulation resistance decreased), so that the motor metal shell charged.

3, the motor winding love tide, insulation aging to reduce the insulation performance

4, lead wire and junction box shell

5, local winding insulation damage to lead the shell

7, line failure

6, wiring board damage or excessive surface oil pollution

8, the core of the wound wire