| 摘要 |
PCT No. PCT/JP85/00477 Sec. 371 Date Apr. 25, 1986 Sec. 102(e) Date Apr. 25, 1986 PCT Filed Aug. 30, 1985 PCT Pub. No. WO86/01654 PCT Pub. Date Mar. 13, 1986.An induction motor control system in which the actual velocity of an induction motor follows a commanded velocity by correcting a difference between actual velocity and commanded velocity, and possesses a current negative feedback loop. The system comprises means (9) obtaining excitation current from actual velocity and a torque command of the difference, means (10) obtaining secondary current, which is load current, from the torque command, means (12) obtaining primary current amplitude and current phase based on the excitation current and secondary current, means (11) obtaining slip frequency from actual velocity and torque command, means (13) obtaining an excitation phase from the slip frequency and actual velocity, means (15) obtaining a current command in each phase based on primary current amplitude and current phase, means (16-21) obtaining a voltage command based on current deviation between the current command in each phase and feedback current from the current negative feedback loop, means (29) for correcting the back electromotive force based on excitation current, and means (22-24) superposing the electromotive force, which is for back electromotive force correction based on the excitation current, upon the voltage command. A signal which renders the back electromotive force of the induction motor constant is produced when outputs from means (9) obtaining the excitation current from actual velocity of the induction motor and the torque command of the difference, the means (11) obtaining slip frequency from actual velocity and torque command, and the means (29) generating the electromotive force for back electromotive force correction based on excitation current, are on an upper side of a base velocity.
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