Browse Prior Art Database

Vernier Control for a Stepper Motor

IP.com Disclosure Number: IPCOM000080362D
Original Publication Date: 1973-Dec-01
Included in the Prior Art Database: 2005-Feb-27
Document File: 2 page(s) / 65K

Publishing Venue

IBM

Related People

Barcomb, JA: AUTHOR [+2]

Abstract

Shown is a schematic block diagram for obtaining vernier operation of a stepper motor, when the normal drive triggers are in the reset condition. The motor may be advanced any number of steps without affecting the normal operation of the motor under control of the drive triggers.

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 62% of the total text.

Page 1 of 2

Vernier Control for a Stepper Motor

Shown is a schematic block diagram for obtaining vernier operation of a stepper motor, when the normal drive triggers are in the reset condition. The motor may be advanced any number of steps without affecting the normal operation of the motor under control of the drive triggers.

The motor 10 has bifilar windings 10a, 10b, 10b, which are connected at one end through resistors R1 and R2 to a positive source of voltage V. The other ends of the windings are connected to drivers 12a, 12a, 12b, 12b. The drivers are controlled by four predrivers 16A, 16A, 16B and 16B in response to selective energization from the on and off outputs A, A, B, B of a pair of triggers 18A and 18B. These triggers are connected to step in a reflected binary code, in response to motor advance pulses applied thereto through an inverter 20.

When the triggers 18A and 18B are in the reset condition, it is sometimes desirable to advance the motor one or more steps such as for positioning a form to a particular line. This is accomplished by a multipole switch 14, which is connected between the predrivers 16A, 16A, 16B, 16B and the drivers 12a, 12a, 12b, 12b. The switch 14 has four input terminals 14A, 14A, 14B and 14B which are connected to predrivers 16A, 16A, 16B, and 16B, respectively.

A movable element 15 of the switch has contact members 15a, 15a, 15b, 15b, which are connected to the terminals 14A, 14A, 14B, and 14B by common conductive segments 15A, 15A, 15...