| 摘要 |
A self-commutating inverter supplies controllable frequency power to a load. The load, which may be a simple induction motor or the like, has plural load windings which may be arranged in two groups so that a load winding in one group has a complementary load winding in another. Thyristors are associated with each of the complemented load windings and the thyristors of each group of load windings are capacitively coupled. A DC potential is applied to the inverter by a pair of terminals. As different thyristors are enabled, current is commutated from one load winding to another. Excessive voltages induced by commutating the inductive loads are reduced by unidirectionally conducting devices coupled between a terminal and a divided load winding. For producing three phase power of controlled frequency, the load has six windings, forming two groups of three windings each. The thyristors associated with each group of windings conduct periodically in a sequence, with each thyristor conducting for one third (or 120 DEG ) of the period. While the conduction periods for each of the groups of load windings are equal, they are offset in time by one-sixth (or 60 DEG ) of the period.
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