Browse Prior Art Database

Stepper Motor Drive Circuit

IP.com Disclosure Number: IPCOM000074178D
Original Publication Date: 1971-Mar-01
Included in the Prior Art Database: 2005-Feb-23
Document File: 2 page(s) / 23K

Publishing Venue

IBM

Related People

Barcomb, JG: AUTHOR [+2]

Abstract

The addition of clamping diodes D1 and D2 to the usual drive circuit for a stepping motor which includes a common resistor R1, a commutating capacitor C1, diodes D3 and D4 in series with the winding switches T1 and T2 allows a smooth response at 400 steps per second, while providing a return speed after two shifts of 2000 steps per second, with a frictional load of 12 inch ounces.

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

Stepper Motor Drive Circuit

The addition of clamping diodes D1 and D2 to the usual drive circuit for a stepping motor which includes a common resistor R1, a commutating capacitor C1, diodes D3 and D4 in series with the winding switches T1 and T2 allows a smooth response at 400 steps per second, while providing a return speed after two shifts of 2000 steps per second, with a frictional load of 12 inch ounces.

At low speed, when A is turned off, stored energy in A winding is discharged through D2 and R1, keeping a current flowing in A which opposes the current building in A, thus smoothing the transition from one step to the next. As the speed is increased by shifting the lead angle of the drive pulse, the current produced by the armature movement is in the same direction and time relation as the drive current, thereby increasing the power in that winding.

1

Page 2 of 2

2

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