Windshield wipers are a vehicle system needed in order to remove moisture and dirt from car windows. By their structure the windshield wipers system is one of the active safety systems, because it provides visibility to the driver in all conditions, and thereby prevents accidents. Windshield wipers are usually located on the windshield and rear window. On some vehicles, there are additional headlights washers. In order to increase the efficiency of the wiper, a washer is additionally used.

Wiper motors and control systems must be able of regulating the rotation speed of the shaft when the load, weather and road conditions change. Rotational speed of the motor shaft with electromagnetic excitation is regulated by changing the current in the parallel field winding. In an electric motor with excitation from permanent magnet, the change of frequency of shaft rotation is achieved by installing an additional third brush, offset from the geometric neutrals, and with intermittent operating mode.