| 摘要 |
PCT No. PCT/JP92/00855 Sec. 371 Date Feb. 19, 1993 Sec. 102(e) Date Feb. 19, 1993 PCT Filed Jul. 6, 1992 PCT Pub. No. WO93/01653 PCT Pub. Date Jan. 21, 1993.A control method and apparatus for actuating an induction motor which is capable of generating a sufficiently large output in a wide speed region. In such an induction motor, each of Y-connection phase windings of the induction motor is divided into two split windings 5t and 3t at a predetermined split ratio (for example, 5:3). When a rotational speed of the induction motor is in a low speed region, only the changeover switch MC2 is turned on to supply exciting current to both of the split windings 5t and 3t. When the rotational speed of the induction motor is in a middle speed region, only the changeover switch MC3 is turned on to exclusively supply exciting current to the split windings 5t. Furthermore, when the rotational speed of the induction motor is in a high speed region, only the changeover switch MC1 is turned on to exclusively supply exciting current to the split windings 3t. With this arrangement, three different numbers of turns can selectively be used with respect to each phase winding so that relatively large number of turns can be used for the rotation in the low speed region, while relatively small number of turns can be used for the rotation in the high speed region in order to accomplish the desired control the actuation of the induction motor.
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