| 摘要 |
The motor (4, 5) is connected to a power supply (6, 7) via an inverter of the direction of rotation and a speed control circuit (8, 9). The inverter comprises two commutators (14, 15) normally in an off position (A) in which the supply circuit of the motor is broken. A control unit (18) is adapted to commutate the commutators (14, 15) alternatingly and temporarily into a working position (B), to drive the motor in corresponding opposite directions of rotation, when it receives a release signal from detector means (21, 22). The latter generate the release signal only when they detect a state of normal function of the control means of the motor. |
