Moveable window unit having a noise reduction system

摘要

A movable window unit having a window glass which can be moved between a closed end position in a well of a door and an open end position by a motorized drive. The motorized drive comprises an electric motor which is controlled by a motor control. To reduce undesirable noises which may arise during the movement of the window glass, the motor is operated by the motor control to repeatedly vary the speed of displacement of the window glass.