| 摘要 |
The invention relates to a control device (1) for an alternating current motor which rotates in two directions and is used for a regulating system. The inventive controll device (1) comprises a switch for switching-on or -off said alternating current motor, wherein a direction can be set by applying a mains voltage to a first or second coil thereof. Each coil (2, 3) is connected to a switching module having a predefined base load. The voltage on the first coil (2) powered by the mains voltage is in phase therewith, the voltage on the second coil (3) is in a different phase with respect to the voltage of the first coil, said phase difference depends on the switch module when the second coil (3) is not powered by the mains voltage. An evaluation unit makes it possible to determine the direction of rotation of said alternating current motor by means of the phase difference between two coils (2,3). |
