| 摘要 |
An induction motor drive apparatus of the type having a speed detector for detecting the rotational speed of an induction motor, speed command device for producing a command speed, and an error amplifier for amplifying a difference between the rotational speed of the induction motor and the command speed, the induction motor being driven by so controlling the amplitude of the primary current as to vary the amplitude of the secondary current in accordance with the difference between the rotational and command speeds. Included are two-phase sinusoidal wave generating device for generating two sinusoidal signals displaced in phase from one another by pi /2 and whose amplitudes conform to the output of the error amplifier, primary load current arithmetic device for computing a primary load current by employing the output of the error amplifier and the output of the two-phase sinusoidal wave generating means, and primary current arithmetic means for computing a two-phase primary current command by adding the primary load current to the output of the two-phase sinusoidal wave generating device, which output serves as an excitation current. The induction motor is driven by the primary current command having an excitation current component and a primary load current component the amplitudes of which vary in accordance with the difference between the rotational speed of the induction motor and the command speed.
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