公开(公告)号：US3628119A

公开(公告)日：1971-12-14

申请号：US3628119D

申请日：1970-04-22

Applicant: IBM

Inventor： ABRAHAM DENNIS G

IPC: G05D3/18 ,  G05B19/40

CPC classification number: G05D3/183

Abstract: Two-speed bidirectional, closed loop stepping motor control is obtained, utilizing only a single feedback encoding device. The feedback signals are combined logically with suitable input controls and suitable acceleration and deceleration pulse sources, to provide the type of operation required. The system operation comprises acceleration to low speed, acceleration to high speed, change from low speed to high speed, change from high speed to low speed, and a stopping sequence from any speed. The stop signal may occur at random with no loss of motor control.

公开(公告)号：US3601678A

公开(公告)日：1971-08-24

申请号：US3601678D

申请日：1970-05-27

Applicant: IBM

Inventor： ABRAHAM DENNIS G ,  DOHANICH GEORGE J ,  PAWLETKO JOSEPH P

IPC: H02P8/14 ,  G05B19/40

CPC classification number: H02P8/14

Abstract: A stepping motor drive which includes both a closed loop feedback control system and an open loop oscillator control system. The stepping motor is started by a start pulse, and feedback pulses from an emitter driven by the motor are gated to accelerate the motor. At the same time, the feedback pulses are gated to reset and synchronize a free-running oscillator. Feedback and oscillator pulses are compared, and when synchronism is achieved, i.e., the motor is up to speed, the oscillator pulse gate drive is enabled. When this occurs, the oscillator is controlled by a discriminator which compares the phase of the oscillator and feedback pulses and corrects the relation therebetween by modifying the oscillator frequency.

公开(公告)号：US3694725A

公开(公告)日：1972-09-26

申请号：US3694725D

申请日：1969-12-29

Applicant: IBM

Inventor： ABRAHAM DENNIS G ,  PAWLETKO JOSEPH P

IPC: H02P8/00 ,  G05B19/40 ,  H02P8/24

CPC classification number: H02P8/24

Abstract: Single step operation of a stepping motor and deceleration of the stepping motor utilized in a closed-loop mode are obtained utilizing a pulse injection arrangement in which a suitable plurality of pulses are supplied in rapid succession to the drive circuits for the stepping motor in order to quickly step the magnetic fields to the proper condition at a rate too fast for the rotor to follow.