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Winding ground fault. In three-phase windings, there is one or more insulation damages that cause the iron core and the base in the winding to collide with each other and cause the current to communicate with the base.
Motor temperature refers to the actual heating temperature of each part of the motor.
The use environment should always be kept dry, the surface of the motor should be kept clean, and the air inlet should not be obstructed by dust, fibers, etc.