SWITCHING MOTOR CONTROL SYSTEM

摘要

A switching motor control system that is particularly well suited for the reel motor of a tape transport system includes an energization command system commanding motor energization 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 difference between commanded motor energization and actual energization as indicated by motor current. An integrator which sums the command and feedback signals with an AC reference signal outputs a triangle wave signal that i readily converted to a digital command signal by 8 simple transistor detector. An economical digital 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.