Electricity: motive power systems – Induction motor systems – Primary circuit control
Patent
1995-05-04
1997-11-04
Martin, David S.
Electricity: motive power systems
Induction motor systems
Primary circuit control
318107, 318811, A02P 126
Patent
active
056843763
ABSTRACT:
A solid state motor speed control is described that is capable of controlling a motor so that it operates quietly, eliminating annoying buzzing noises that would otherwise be generated by the motor's windings. The invention provides for motor speed control with infinitely variable speed control settings. Rather than use triacs that generate RFI noise and cause motor windings to buzz due to their inherent avalanche switching, the invention utilizes power FETs or IGBTs to provide the switching function to control power delivery to the motor load. The power switches are controlled by an oscillator that generates a pulse train with a duty cycle controllable by the user. A filter shapes this signal into a trapezoidal control signal that drives the gate input of the power FET or IGBT switch. A kick start circuit turns the motor on initially for two to three seconds to overcome the inertia of the motor and its load. A zero crossing detector prevents the motor from being turned on except at a zero crossing of the AC source to further reduce noise.
REFERENCES:
patent: 3569805 (1971-03-01), Hammond
patent: 4459529 (1984-07-01), Johnson
patent: 4482852 (1984-11-01), Musckovac
patent: 4520298 (1985-05-01), Abbondanti
patent: 4575668 (1986-03-01), Baker
patent: 4578746 (1986-03-01), Gyugyi et al.
patent: 4616305 (1986-10-01), Damiano et al.
patent: 4673851 (1987-06-01), Disser
patent: 5099468 (1992-03-01), Chen et al.
patent: 5111374 (1992-05-01), Lai et al.
patent: 5210684 (1993-05-01), Nam
patent: 5227703 (1993-07-01), Boothe et al.
Bradley Roger
Neiger Benjamin
Rosenbaum Saul
Watson Douglas R.
Leviton Manufacturing Co. Inc.
Martin David S.
Sutton Paul J.
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