| 摘要 |
An electronic start control device for unidirectionally rotating a permanent-magnet rotor (14) of a synchronous motor (10), comprises: a static switch (22) for series connection to a winding of a stator (12) of the synchronous motor (10); and a position sensor (24) for detecting a position of the rotor (14) of the synchronous motor (10) and for providing a corresponding output (P con ). The device is characterised by including an AC to AC converter (26) having an input (V a ) from an alternating current-voltage source (V ac ) at a fixed frequency connected in series with the stator (12) of the synchronous motor (10), and a single output (V c ) derived from the voltage input (V a ); and an XNOR unit (28) having a first input (G 1 ) in communication with the output (V c ) of the AC to AC converter (26), a second input (G 2 ) in communication with an output (P) of the position sensor (24), and an output (G O ) in communication with the static switch (22). The static switch (22) is controllable by a signal (G con ) output from the XNOR unit (28), so that the rotor (14) of the synchronous motor (10) only rotates in a single direction. Preferably, the AC to AC converter is a phase-shifter (26). |
