Fire Hazard Of Electric Motors

The specific fire causes of the motor are as follows:
1. Overload
It will cause the winding current to increase, the temperature of the winding and the core to rise, and in severe cases, it will cause fire.
2. Phase off operation
Although the motor can still operate, the winding current will increase so that it burns the motor and causes a fire.
3. Poor contact
It will cause excessive contact resistance and heat generation or arc, and in severe cases, it can ignite the combustible materials in the motor and cause fire.
4. Insulation damage
A phase-to-phase and turn-to-turn short circuit is formed, which causes a fire.
5. Mechanical friction
When the bearing is damaged, it can cause stator, rotor friction or motor shaft jamming, resulting in high temperature or winding short circuit and causing fire.
6. Improper selection
7. Excessive core consumption
It will cause excessive eddy current loss, causing core heating and winding overload, and causing fire in severe cases.
8. Poor grounding
When the motor winding pair is short-circuited, if the grounding is poor, it will cause the motor shell to be electrified, on the one hand, it can cause personal electric shock accidents, on the other hand, it will cause the casing to heat, and in severe cases, ignite the surrounding combustibles and cause fire.