Browse Prior Art Database

4-STATE PHASE LOCKED SPEED REGULATOR

IP.com Disclosure Number: IPCOM000026555D
Original Publication Date: 1992-Oct-31
Included in the Prior Art Database: 2004-Apr-06
Document File: 2 page(s) / 70K

Publishing Venue

Xerox Disclosure Journal

Abstract

There is a need for reducing costs in low performance applications such as paper transports. To this end, disclosed in Figures 1 and 2 is a low cost digital phase lock speed regulator (PLSR) that is designed for single-speed, one-direction applications such as paper transports which uses the phase difference between system clock pulses and motor-derived tach pulses to control the power input to the motor to be proportional to this phase difference.

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Page 1 of 2

XEROX DISCLOSURE JOURNAL

CLOCK

Pulse 4 I i+

shaft pulse generator

4-STATE PHASE LOCKED SPEED REGULATOR U.S. C1.2711288 Jacob N. Kluger

Proposed Classification

Int. C1. B65h 39/10

1

I I I

m-

Controller

pulses TACH motor controller the to into the coupled back fed k

CLOCK pulses from an independent source

roughly speaking CfOCKpulse+ motorswitched on

TACH pulse + motor switched off

power proportional to the phase difference gives constant average speed

TACH

---

Onm

power

L---

load

Pulse Generator

I i

FIG. I

result

TACH

TACH

CLOCK {3w

 state 00 fwd power

v CLOCK

state 1'

TK

FIG. 2

XEROX DISCLOSURE JOURNAL - Vo1.17 No. 5 September/October 1992 301

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Page 2 of 2

4-STATE PHASE LOCKED SPEED REGULATOR(C0nt'd)

There is a need for reducing costs in low performance applications such as paper transports. To this end, disclosed in Figures 1 and 2 is a low cost digital phase lock speed regulator (PLSR) that is designed for single-speed, one- direction applications such as paper transports which uses the phase difference between system clock pulses and motor-derived tach pulses to control the power input to the motor to be proportional to this phase difference.

A detailed description of the digital PSLR operation is given by the state diagram in Figure 2 while the overall operation of the digital PSLR is shown in Figure 1. The load is of a paper transport. In some cases the reference clock originates from a remote "machine cl...