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Digital Velocity Control for DC Motor

IP.com Disclosure Number: IPCOM000094051D
Original Publication Date: 1966-May-01
Included in the Prior Art Database: 2005-Mar-06
Document File: 2 page(s) / 36K

Publishing Venue

IBM

Related People

Melnyk, G: AUTHOR

Abstract

Velocity control of DC motor 10 is obtained by activating motor drive circuit 12 from the on output of accelerate trigger T1. The latter is set by pulses from pulse generator or clock 14 which is started by a Run signal. Feedback pulses from emitter 16 on the motor shaft are applied through shaper amplifier 18 to set trigger T2, reset clock 14, and reset T1 after T2 is set.

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Digital Velocity Control for DC Motor

Velocity control of DC motor 10 is obtained by activating motor drive circuit 12 from the on output of accelerate trigger T1. The latter is set by pulses from pulse generator or clock 14 which is started by a Run signal. Feedback pulses from emitter 16 on the motor shaft are applied through shaper amplifier 18 to set trigger T2, reset clock 14, and reset T1 after T2 is set.

When the Run line is brought up, clock 14 starts and the first pulse sets T1, which turns on circuit 12 so that motor 10 accelerates. The first feedback pulse resets clock 14 and sets T2. A clock pulse occurring before a feedback pulse indicates motor 10 is not up to speed, and it resets T2 so motor 10 continues to accelerate.

The following feedback pulse again sets T2 and resets clock 14. Should a feedback pulse occur before a clock pulse, T1 is reset, T2 being on, turning off the circuit 12. This pulse resets clock 14 and a new cycle begins as shown by timing drawing.

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