| 摘要 |
A poly-phase alternating-current induction (or synchronous) motor is used as a servo-motor in a feedback control system. The motor is supplied by a variable frequency and variable voltage poly-phase alternating-current power supply. Two different frequency signals are generated, the one being a control frequency signal which is proportional to the error signal and the other being an acceleration frequency signal which produces a predetermined slip frequency with reference to the motor velocity (or a predetermined load angle with reference to the motor rotation angle) in the direction to reduce the error signal. Either one of the two frequency signals which is nearer to the frequency of the motor velocity, controls the variable frequency of the alternating-current power supply.
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