Browse Prior Art Database

PULSE POSITION CONTROL OF BRUSHLESS D. C. MOTORS

IP.com Disclosure Number: IPCOM000023276D
Original Publication Date: 1977-Apr-30
Included in the Prior Art Database: 2004-Mar-29
Document File: 2 page(s) / 230K

Publishing Venue

Xerox Disclosure Journal

Abstract

A phase locked loop-motor control system which may find part-icular application in facsimile devices operating on a digital data input pulse train (A) . The torque on the motor which controls, for example, the photoreceptor rotational speed in xerographic machines, is regulated by controlling the phase angle of the power pulses (B) to the motor windings, relative to the shaft position, via power amplifier and commutation means 14. This is accomplished by means of a power pulse position modulation circuit having a comparator 10 which com-pares the phase of the power pulses (B) and the data input pulses (A) . The output (C) of the comparator 10 is utilized as a shift control pulse in the holding circuit 12. Holding circuit 12 operates on a shaft position feedback pulse train (D) derived from an encoder (not shown) coupled to the motor output shaft. The holding circuit will delay or advance the power pulses (8) , relative to the feedback pulses (D) , ac-cording to the width of the shift pulses (C) . In such manner, the frequency of the shaft position pulses (D) and therefore, shaft speed will be automatically adjusted to the same fre-quency as the data input pulses (A)

This text was extracted from a PDF file.
At least one non-text object (such as an image or picture) has been suppressed.
This is the abbreviated version, containing approximately 95% of the total text.

Page 1 of 2

XEROX DISCLOSURE JOURNAL

PULSE POSITION CONTROL OF BRUSH- Proposed Classification
LESSD.C. MOTORS U.S. Cl. 318/138
JácobN. Kiuger mt. Cl. H02k 29/00

OUTPUT

SHAFT

fl-fl-A

~4B

i-~LJ~c

A phase locked loop~motor control system which may find part-
icular application in facsimile devices operating on a digital
data input pulse train (A) . The torque on the motor which
controls, for example, the photoreceptor rotational speed in
xerographic machines, is regulated by controlling the phase
angle of the power pulses (B) to the motor windings, relative
to the shaft position, via power amplifier and commutation
means 14. This is accomplished by means of a power pulse
position modulation circuit having a comparator 10 which com-
pares the phase of the power pulses (B) and the data input
pulses (A) . The output (C) of the comparator 10 is utilized as
a shift control pulse in the holding circuit 12. Holding
circuit 12 operates on a shaft position feedback pulse train
(D) derived from an encoder (not shown) coupled to the motor
output shaft. The holding circuit will delay or advance the
power pulses (8) , relative to the feedback pulses (D) , ac-
cording to the width of the shift pulses (C) . In such manner,
the frequency of the shaft position pulses (D) and therefore,
shaft speed will be automatically adjusted to the same fre-
quency as the data input pulses (A)

Volume 2 Number 2 March/April 1977 61

[This page contains 1 picture or other non-text object]

Page 2 of 2

LL61 ipdv/qonw a nquxnN a eUIfl...