Electricity: motive power systems – Induction motor systems – Primary circuit control
Patent
1981-08-07
1983-08-30
Smith, Jr., David
Electricity: motive power systems
Induction motor systems
Primary circuit control
318685, 318806, H02P 540
Patent
active
044019343
ABSTRACT:
A control system for a permanent-magnet motor (10) driven by a multiphase line-commutated inverter (12) is provided with integrators (24) for integrating the back EMF of each phase of the motor for use in generating system control signals for an inverter gate logic (30) using a sync and firing angle (.alpha.) control generator (26) connected to the outputs of the integrators. A precision full-wave rectifier (16) provides a speed control feedback signal to a phase-delay rectifier (14) via a gain and loop compensation circuit (20) and to the integrators for adaptive control of the attenuation of low frequencies by the integrators as a function of motor speed, whereby as the motor speed increases, the attenuation of low frequency components by the integrators is increased to offset the gain of the integrators to spurious low frequencies. While the attenuation may be a continuous linear function of speed, a switch (Q.sub.1) is employed to provide a step change in attenuation at 40% of speed.
REFERENCES:
patent: 3619749 (1971-11-01), Schieman
patent: 4112339 (1978-09-01), Lipo
patent: 4137489 (1979-01-01), Lipo
patent: 4264853 (1981-04-01), Morishita
patent: 4335343 (1982-06-01), Dreiseitl et al.
Bailey David A.
Dolland Carlisle R.
Beumer Joseph H.
Manning John R.
Smith Jr. David
The United States of America as represented by the Administrator
Wofford, Jr. Leon D.
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