Induction motor drive apparatus

Details Induction motor drive apparatus Induction motor drive apparatus

1979-10-31

1982-04-27

Smith, Jr., David

Electricity: motive power systems

Induction motor systems

Primary circuit control

318803, H02P 540

Patent

active

043273157

ABSTRACT:
Disclosed is an induction motor drive apparatus which brings the actual speed of an induction motor into coincidence with a command speed by varying the frequency and effective value of a three-phase AC voltage applied to the induction motor. The apparatus includes an inverter for generating three-phase AC voltage, a speed deviation signal generator, an amplitude controller for controlling the amplitude of the speed deviation signal, an adder for adding together a voltage signal which conforms to the actual speed and the speed deviation signal which has been controlled, a rectangular waveform signal generator, and a pulse width modulator. The rectangular waveform signal generator is adapted to produce a three-phase rectangular signal whose frequency is proportional to the output voltage value of the adder. The rectangular signal of each phase is modulated in pulse width on the basis of the speed deviation, the inverter being controlled by each resulting pulse-width modulated rectangular signal to thereby vary the effective value of the three-phase AC voltage.

REFERENCES:
patent: 3346794 (1967-10-01), Stemmler
patent: 3353081 (1967-11-01), Stemmler
patent: 3821620 (1974-06-01), Lindberg
patent: 3878445 (1975-04-01), Kirkham et al.
patent: 3887853 (1975-06-01), Klein et al.
patent: 3912993 (1975-10-01), Bereisa, Jr.
patent: 4042862 (1977-08-01), Franklin
patent: 4227138 (1980-10-01), Espelage et al.
patent: 4247890 (1981-01-01), Cutler et al.

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