| 摘要 |
The actuator includes a reversible polyphase electric motor (M) and an integral starter circuit including coupling means (4,5), through which the terminals for connecting the circuit to a polyphase electric supply are connected to the motor terminals and by means of which the sense of phase rotation at the motor terminals can be reversed relatively to the sense of phase rotation at the terminals. Also provided is a control circuit (7) for sensing the phase sequence of the electrical supply and which is operative such that the sense of phase rotation at the motor terminals is in a direction to cause rotation of the motor in a selected direction irrespective of the sense of phase rotation at said terminal means. <IMAGE> |
