Current control method and circuit for electronically-commutated

Details Current control method and circuit for electronically-commutated Current control method and circuit for electronically-commutated

1984-10-18

1985-12-10

Dobeck, B.

Electricity: motive power systems

Switched reluctance motor commutation control

318138, 318439, H02P 602

Patent

active

045582645

ABSTRACT:
Techniques for controlling motor winding current by employing ON/OFF duty cycle control switching between an upper and a lower current threshold to establish an average motor winding current approximately midway between the two thresholds. Rising current during ON time intervals is directly measured, and an upper threshold detector is employed to turn OFF a switching transistor when the upper current threshold is reached. Rather than directly measuring decay or flyback current which circulates in the motor windings through free-wheeling diodes for comparison against the lower current threshold, the decay time is simulated. A lower current threshold detector and an upper current threshold detector are employed. Following winding energization, the lower threshold current detector starts a timing device. The upper threshold current detector subsequently stops the timing device, and turns OFF the switching transistor. Winding current then decays, and the decay time needed to reach the lower threshold is simulated by waiting for a decay time interval which is a function of the measured rise time interval.

REFERENCES:
patent: 4107593 (1975-08-01), Anderson
patent: 4250435 (1981-02-01), Alley
patent: 4303871 (1981-12-01), Berry
patent: 4350943 (1982-09-01), Pritchard
patent: 4368411 (1983-01-01), Kidd
patent: 4393339 (1983-07-01), Kimura
patent: 4409524 (1983-10-01), Neilsen et al.
patent: 4490661 (1984-12-01), Brown et al.

Affiliated with

Also associated with

Rating

Current control method and circuit for electronically-commutated does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Current control method and circuit for electronically-commutated, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Current control method and circuit for electronically-commutated will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-60939