| 摘要 |
The invention proposes that a supply transformer (T) has primary and secondary windings brought out so that on the primary side a switch (S3) and on the secondary side (S4) can connect them in star or delta. A switch (S1) can connect the motor (M) in star or delta. A further switch (S2) selects whether the motor is connected to the transformer or directly to the mains supply. A control circuit (ST) decides on the combination of all these switches appropriate to the current load demand. |
