| 摘要 |
PURPOSE:To miniaturize an apparatus and to lower its cost by constituting respective phase windings from part winding groups, by dividing said windings into groups according to a rotational speed and by providing said apparatus with connection change-over means for series connection within a group and for parallel connection between groups. CONSTITUTION:A servo control circuit for three-phase AC synchronous motor is composed of an encoder 11 detecting the rotational position of a motor 10, a deviation counter 12, a D/A converter 13, an amplifier 14, a three-phase synchronous rectifier 15, an inverter part 17, a converter part 18 and others. Further, an output current is fed back from the inverter part 17 to a current amplifier 16 and a speed signal, from an F/V converter 21. Also, a motor winding is composed of U-W-phase windings 1-3, which are divided by a multiplier of 2 respectively and connected with a winding change-over part 20 to form respective phase part windings 1a-3b into series and parallel connection state. Thus, connection change-over of said windings 1-3 is performed by a signal from a change-over command part 22 according to the number of revolutions. |
