Browse Prior Art Database

DC Motor Control and Reversing Circuit on Single PC Card

IP.com Disclosure Number: IPCOM000041517D
Original Publication Date: 1984-Feb-01
Included in the Prior Art Database: 2005-Feb-02
Document File: 2 page(s) / 49K

Publishing Venue

IBM

Related People

Sandusky, CF: AUTHOR

Abstract

A speed control and reversing circuit, for DC motors of fractional size up to 1/8 hp, fabricated on a single printed circuit (PC) card is illustrated. When the operating sequence begins, CR1 and CR2 are deenergized so there is no drive voltage to the motor armature. 115 VAC applied to D1-D4 will provide full-wave rectification. Depending on the P1 setting, Q1, Q2 and Q3 will turn on the SCR to provide armature voltage. Field voltage is continuous through the rectification network. P1 and P3 control the MIN/MAX voltage available, and CR1 and CR2 can be switched to obtain motor direction. CR1 and CR2 contacts will handle small motor armature current when switched to start or reverse armature direction on geared motors; instantaneous reversing is possible.

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 100% of the total text.

Page 1 of 2

DC Motor Control and Reversing Circuit on Single PC Card

A speed control and reversing circuit, for DC motors of fractional size up to 1/8 hp, fabricated on a single printed circuit (PC) card is illustrated. When the operating sequence begins, CR1 and CR2 are deenergized so there is no drive voltage to the motor armature. 115 VAC applied to D1-D4 will provide full-wave rectification. Depending on the P1 setting, Q1, Q2 and Q3 will turn on the SCR to provide armature voltage. Field voltage is continuous through the rectification network. P1 and P3 control the MIN/MAX voltage available, and CR1 and CR2 can be switched to obtain motor direction. CR1 and CR2 contacts will handle small motor armature current when switched to start or reverse armature direction on geared motors; instantaneous reversing is possible.

1

Page 2 of 2

2

[This page contains 4 pictures or other non-text objects]