| 摘要 |
PURPOSE:To compensate a variation in the temperature of the secondary winding time constant of a motor by detecting interlinked magnetic flux of q<e> axis secondary winding, and correcting a slip frequency and the secondary winding time constant, thereby compensating the delay of a controller. CONSTITUTION:A rotary coordinates converter 16 converts an output voltage detected by a search coil wound in the primary winding to voltages vd<e>c, vg<e>c of rotary coordinates. The calculator 17 of secondary interlinked magnetic flux equivalent calculates the secondary interlinked magnetic flux equivalent lambda'g<e>r by the voltages vd<e>c, vg<e>c and the primary winding currents id<e>s, ig<e>g. The secondary winding resistance setter 18 controls the time constant set value of the secondary winding used for calculating in the secondary magnetic flux slip frequency calculator 12 by the equivalent lambda'g<e>r, torque current ig<e>r and synchronizing angle frequency command omega to coincide with the time constant value of the secondary winding of an induction motor. |
