Brushless DC motor control

Electricity: motive power systems – Switched reluctance motor commutation control

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Details

318439, 318138, H02P 506

Patent

active

060344938

ABSTRACT:
An electronically commutated brushless DC motor primarily for fractional horsepower applications of the type where at any instant one motor winding is unpowered and used to detect back EMF zero-crossings which information is used to initiate winding commutations. The duration of the pulse produced in this winding due to dissipation of stored energy by free-wheel diodes in parallel with the commutation devices after supply of current has been removed from this winding is used to provide a measure of motor current. This allows for simplified commutation device current limiting circuits and is available for control purposes which are a function of motor torque. There is also disclosed a method for maximizing useful power output by reducing the phase angle between the motor current and the back EMF. This is accomplished by introducing a delay in commutating the motor windings beyond the occurrence of each back EMF zero-crossing, with the delay being a function of the time between commutations.

REFERENCES:
patent: 4480218 (1984-10-01), Hair
patent: 4495450 (1985-01-01), Tokizaki et al.
patent: 4540921 (1985-09-01), Boyd, Jr. et al.
patent: 4743815 (1988-05-01), Gee et al.
patent: 4857814 (1989-08-01), Duncan
patent: 4912378 (1990-03-01), Vukosavic
patent: 5306988 (1994-04-01), Carobolante et al.
patent: 5317243 (1994-05-01), Cameron
patent: 5436547 (1995-07-01), Nagai et al.
patent: 5486743 (1996-01-01), Nagai
patent: 5514939 (1996-05-01), Schlager et al.
patent: 5541484 (1996-07-01), DiTucci
patent: 5616993 (1997-04-01), Lu et al.
patent: 5619109 (1997-04-01), Cameron et al.
patent: 5631999 (1997-05-01), Dinsmore
patent: 5656897 (1997-08-01), Carobolante et al.
patent: 5672948 (1997-09-01), Cohen et al.
patent: 5764020 (1998-06-01), Maiocchi
patent: 5783917 (1998-07-01), Takekawa
patent: 5859512 (1999-01-01), Buthker
patent: 5859520 (1999-01-01), Bourgeois et al.

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