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Stepping Motor Constant Velocity Drive

IP.com Disclosure Number: IPCOM000074402D
Original Publication Date: 1971-Apr-01
Included in the Prior Art Database: 2005-Feb-23
Document File: 2 page(s) / 33K

Publishing Venue

IBM

Related People

Abraham, DG: AUTHOR [+3]

Abstract

This stepping motor control system 10 provides a constant velocity drive. Stepping motor 12 is started by a start pulse from winding sequence logic 16 and motor drive circuits 14 and feedback pulses from an emitter 20 driven by the motor are gated via amplifier and sampler 26 to accelerate the motor. At the same time, the feedback pulses are gated to a free running oscillator in phase-locked oscillator and discriminator circuit 24 to reset and synchronize the same. The output from the oscillator is compared with the feedback pulses by sync logic 26, and when synchronism is achieved, i.e. the motor is up to speed, the oscillator pulses are gated to stopping sequence generator 18 under control of signal which is produced by sync logic 26.

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Stepping Motor Constant Velocity Drive

This stepping motor control system 10 provides a constant velocity drive. Stepping motor 12 is started by a start pulse from winding sequence logic 16 and motor drive circuits 14 and feedback pulses from an emitter 20 driven by the motor are gated via amplifier and sampler 26 to accelerate the motor. At the same time, the feedback pulses are gated to a free running oscillator in phase- locked oscillator and discriminator circuit 24 to reset and synchronize the same. The output from the oscillator is compared with the feedback pulses by sync logic 26, and when synchronism is achieved, i.e. the motor is up to speed, the oscillator pulses are gated to stopping sequence generator 18 under control of signal which is produced by sync logic 26. When this occurs, the oscillator is controlled by a discriminator in the PLO and discriminator circuit 24 which compares the phase of the oscillator and feedback pulses and corrects the relation therebetween by modifying the oscillator frequency.

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