Control of a brushless motor

Details Control of a brushless motor Control of a brushless motor

1997-04-10

1999-01-12

Masih, Karen

Electricity: motive power systems

Induction motor systems

Primary circuit control

318798, 318771, 318727, 318254, 318138, 318439, H02P 528

Patent

active

058595201

ABSTRACT:
The invention provides a method for controlling a brushless motor, with windings connected in star (`wye`) formation, including the steps of periodically applying a supply voltage between first and second windings, detecting the presence of a current in a third winding, and an instant of cessation of that current, monitoring the value of a back emf induced in the third winding and detecting a zero crossing point of the back emf, timing a predetermined delay from the zero crossing point, and after the end of the delay, applying the supply voltage to other windings. The invention also provides a method for use with motors having windings connected in delta formation.

REFERENCES:
patent: 4654566 (1987-03-01), Erdman
patent: 5172036 (1992-12-01), Cameron
patent: 5216343 (1993-06-01), Genheimer et al.
patent: 5343127 (1994-08-01), Maiocchi
patent: 5397972 (1995-03-01), Maiocchi
patent: 5631999 (1997-05-01), Dinsmore
French Search Report from French Patent Application 96 04816, filed Apr. 12, 1996.
Patent Abstracts of Japan, vol. 17, No. 698 (E-1481), Dec. 20, 1993 & JP-A-05 236785 (Kikuchi Atsushi).
Machine Design, vol. 63, No. 23, Nov. 21, 1991, Cleveland US, pp. 71-75, L.A. Berardinis, "Good Motors Get Even Better".

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