Electric motor control apparatus

Details Electric motor control apparatus Electric motor control apparatus

1979-11-16

1982-03-30

Truhe, J. V.

Electricity: motive power systems

Induction motor systems

Primary circuit control

318799, 318805, 318808, 318812, 318807, H02P 534, H02P 742

Patent

active

043226728

ABSTRACT:
Electric motor control apparatus includes a variable-frequency oscillator 10, a counter 11 clocked by the oscillator, and signal generating means 12 arranged to generate two sinusoidal voltages in quadrature with one another. The two voltages are applied through separate amplifiers 22, 23 to separate stator windings 24, 26, of the motor, the stator windings being 90.degree. apart. Control means includes a bistable circuit 28 producing a signal lagging 45.degree. behind one sinusoidal voltage, and a phase sensitive detector 29 arranged to vary the frequency of the oscillator 10 to maintain a constant phase difference.

REFERENCES:
patent: 3896348 (1975-07-01), Loderer
patent: 3962614 (1976-06-01), Rettig
patent: 4052648 (1977-10-01), Nola
patent: 4088934 (1978-05-01), D'Atre et al.
patent: 4158801 (1979-06-01), Hirata

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