| 摘要 |
In an induction motor, which may be a squirrel-cage or wound-rotor. it is known that the speed of the motor depends on the supply frequency and the number of stator poles. Even if the speed of a wound-rotor type motor can be controlled, it depends mainly by the load. In this invention, the speed of an induction motor can be fully controlled -no matter of load- by applying a very small amount of direct-current on it. |
