| 摘要 |
A device and method for controlling an induction motor operated through an inverter at a high speed so that the efficiency of the motor can be always the highest. The device is provided with an effective power measuring means (3) which measures the effective power supplied to a motor (14), a calculating means (1, 2, 4, 5, 6, 7, 8, 16, S1, S2, and S3) which calculate such an AC voltage (V1) supplied to the motor (14) that the efficiency of the motor (14) becomes the highest, based on the measured effective power and the frequency (f) of the voltage (V1), and means (9, 10, 11, and 12) which supply the calculated supply voltage (V1) to the motor (14). <IMAGE> |
