Switching motor control system

Details Switching motor control system Switching motor control system

H - Electricity

02

P

341/47, 318/88

H02P 7/00 (2006.01) G11B 15/46 (2006.01) H02P 7/29 (2006.01)

Patent

CA 1098193

Abstract of the Disclosure A switching motor control system that is particularly well suited for the reel motor of a tape transport system in- cludes an energization command system commanding motor energiza- tion in response to tape buffer loop length, a feedback system indicating buffer loop length and actual motor current and a feedfoward system energizing the motor to reduce the differ- ence between commanded motor energization and actual energization as indicated by motor current. An integrator which sums the com- mand and feedback signals with an AC reference signal outputs a triangle wave signal that i readily converted to a digital com- mand signal by 8 simple transistor detector. An economical dig- ital control circuit delays and selectively inhibits the digital command signal to control a motor drive amplifier in a switching mode which avoids power dissipation in the motor drive amplifier.

275733

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