公开(公告)号：WO1980002346A1

公开(公告)日：1980-10-30

申请号：PCT/US1980000336

申请日：1980-03-27

Applicant: NCR CORP

Inventor： NCR CORP ,  DEL SIGNORE J ,  ACHARYA R

IPC: H02P05/16

CPC classification number: H02P7/2885 ,  H02P23/22 ,  Y10S388/912 ,  Y10S388/915 ,  Y10S388/93 ,  Y10S388/933

Abstract: A speed control circuit for a motor (24) is responsive to variations in motor supply voltage (Vs) and torque wherein a voltage output (72) is produced by means (29-68) determined by the actual speed of the motor. The voltage output is applied to a comparator (28) which also receives the output ramp voltage of a ramp circuit (76, 78) based on the motor supply voltage. The output of the comparator controls the width of the motor voltage pulses (92) applied from a power amplifier (88) to the motor in which the voltage pulses applied have a proportionally larger width for a smaller level of motor supply voltage or for an increase in torque, and have a proportionally narrower width for increased levels of motor supply voltage or for a decrease in torque. A one-shot network (116) is provided for motor stall protection.