220V Cooling Fan impedance will produce what kind of function

"220V Cooling Fan" impedance will have two functions, one is the impedance protection function, one is thermal protection, they are like? The following were to present to you:
1. "220V Cooling Fan" thermal protection to prevent motor burnout occurs when you shut down, the motor temperature reaches appreciation burnout temperature before cutting off the way through the heating element.
2. Impedance protection to prevent motor burnout occurs when you shut down, the way the motor winding is set impedance (alternating current resistance), so that appreciation is maintained at a temperature below the burning temperature of the motor.
Conventional "220V Cooling Fan" is not overheating protection, the normal DC cooling fan can only lock machine 2H, the temperature slowly rising, a long time, the motor will burn, IC will burn, which is a thermal protection an important role.