Motor unit functioning step by step.

摘要

The motor assembly comprises a stepping motor (1) and its control circuit (41), which are so designed that the rotor (15) of the motor normally only rotates in one direction. It also comprises a device for reversing the direction of rotation (61) which consists of at least one magnetic element (63) and means (81) for moving this element between a retracted position in which it has no effect on the running of the motor and a working position in which it forces the rotor to change its neutral position and to rotate in the reverse direction. <IMAGE>