| 摘要 |
PCT No. PCT/GB79/00078 Sec. 371 Date Jan. 10, 1980 Sec. 102(e) Date Jan. 10, 1980 PCT Filed May 24, 1979 PCT Pub. No. WO79/01132 PCT Pub. Date Dec. 27, 1979.A variable reluctance electric motor system includes a variable reluctance motor having a main winding for each phase and a power converter circuit including a main thyristor in series with each main winding connected across a direct voltage source from which the main windings are supplied sequentially with uni-directional current pulses, characterized by a commutating thyristor (16) for starving the main thyristor (12) of the current flowing through one main winding (11) while charging a capacitor unit (51,52) in one sense, and a commutating thyristor (26) for starving the main thyristor (22) of the next phase winding (21) of the current flowing through the next main winding (21) while charging the capacitor unit in the other sense. The arrangement is such that commutation of a main thyristor initiated by firing a commutating thyristor and terminated when this commutating thyristor ceases to conduct, leaves the commutating capacitor unit charged with the correct polarity and adequate voltage for the commutation of the next main thyristor in the conducting sequence. |
