The impedance of the dc fan can produce two kind of functions.

The impedance of the DC fan will produce two functions, then what are them?

1, impedance protection to prevent burning loss when motor is closing, the way to set the motor coil impedance (ac resistance), keep the motor temperature rise value under burning temperature.

2, thermal protection to prevent motor loss when closed, before the motor temperature rise up to the burning temperature, is reached by hot components to cut off the way.