Start up circuit for continuous sine-wave commutated brushless m

Details Start up circuit for continuous sine-wave commutated brushless m Start up circuit for continuous sine-wave commutated brushless m

1993-09-16

1996-02-13

Cabeca, John W.

Electricity: motive power systems

Plural, diverse or diversely controlled electric motors

Work and feed motors

318 54, 318 65, 318603, 318439, B23Q 510

Patent

active

054913918

ABSTRACT:
Automatic start up of a continuous sine-wave commutated, brushless, direct current motor in a predetermined direction is done by applying a ramped armature current to the direct current motor to generate an armature field. The resulting armature field is rotated independent of angular position of the shaft. Upon rotation of the motor shaft beginning, the direction of rotation of the shaft is determined. Responsive to rotation of the shaft in an undesired direction, the direction of rotation of the armature field is reversed. A base angle of rotation of a shaft in the direct current motor is determined from an index mark as it rotates by an index mark detector. Responsive to detection of the index mark, rotation of the armature field and the angular position of the shaft are synchronized.

REFERENCES:
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patent: 4429267 (1984-01-01), Veale
patent: 4455513 (1984-06-01), Fulton et al.
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patent: 5194794 (1993-03-01), Shamoto
Gerhard Pfaff et al., "Design and Experimental Results of a Brushless AC Servo Drive", IEEE Transactions On Industry Applications, vol. IA-20, No. 4, Jul./Aug. 1984, pp. 814-821.

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