Electricity: motive power systems – Induction motor systems – Primary circuit control
Patent
1996-06-28
1999-07-13
Cabeca, John W.
Electricity: motive power systems
Induction motor systems
Primary circuit control
318808, 318812, H02P 540
Patent
active
059231440
ABSTRACT:
A method for generating electrical frequencies of a alternating current motor is disclosed wherein a torque current command signal, a d-axis voltage command signal and a d-axis voltage feedback signal are combined to generate the stator electrical frequency in the synchronous reference frame. The method also provides an estimate of the rotor electrical frequency as well as of the motor speed. The frequency generator is preferably incorporated in a variable frequency motor controller for driving a motor at desired speeds independent of changing load conditions. The generator permits the controller to maintain field oriented control without the need for speed sensing and feedback.
REFERENCES:
patent: 4968925 (1990-11-01), DeDoncker
patent: 5032771 (1991-07-01), Kerkman et al.
patent: 5038092 (1991-08-01), Asano et al.
patent: 5162727 (1992-11-01), Hindsberg et al.
patent: 5532570 (1996-07-01), Tajima et al.
patent: 5594670 (1997-01-01), Yamamoto
patent: 5598081 (1997-01-01), Okamura et al.
Kerkman Russel J.
Rowan Timothy M.
Seibel Brian J.
Stachowiak Kevin G.
Allen-Bradley Company LLC
Cabeca John W.
Horn John J.
Miller John M.
Yoder Patrick S.
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