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Browse Prior Art Database

Brake Control Method for DC Motor

IP.com Disclosure Number: IPCOM000121855D
Original Publication Date: 1991-Oct-01
Included in the Prior Art Database: 2005-Apr-03
Document File: 4 page(s) / 105K

Publishing Venue

IBM

Related People

Hanabuchi, Y: AUTHOR [+3]

Abstract

Disclosed is a brake control method for a DC motor which is used as a carrier driver of a high speed serial dot matrix printer. The method reduces mechanical vibration of printer unit at brake time of print end. In addition, the method keeps deceleration distance constant in acceptable tolerance with controlling deceleration torque.

This text was extracted from an ASCII text file.
This is the abbreviated version, containing approximately 55% of the total text.

Brake Control Method for DC Motor

      Disclosed is a brake control method for a DC motor which
is used as a carrier driver of a high speed serial dot matrix
printer.  The method reduces mechanical vibration of printer unit at
brake time of print end. In addition, the method keeps deceleration
distance constant in acceptable tolerance with controlling
deceleration torque.

      Fig. 1 shows H-bridge DC motor drive circuit which is commonly
used in bidirectional motor rotation (clockwise and
counterclockwise).  Signals CTRL1 and CHOP1 are a pair control signal
for clockwise rotation, and signal CTRL2 and CHOP2 are another pair
for counterclockwise rotation.  The following explanation is for the
clockwise direction and motor current is i-a shown in Fig. 1.  In
case of counterclockwise direction, the signal name in the
explanation is changed and operation is similar to the clockwise
case.

      In the conventional brake method, current i-b, excited by
electromotive force of motor at brake time (at this time, CTRL2 is
active and transistor Q2 is stationary ON), is used as self-brake
force at first. Next, CHOP2 is active to flow current i-c to stop
motor.  Current waveform is shown in Fig. 2 and motor velocity is
shown in Fig.  3.  The conventional method is insufficient to prevent
sudden velocity change which causes mechanical vibration of the
printer unit when motor rotation rate is high (see marked position in
Fig. 3).

      The method disclosed her...