Browse Prior Art Database

Control of Electromagnet Stepping Motor

IP.com Disclosure Number: IPCOM000077560D
Original Publication Date: 1972-Aug-01
Included in the Prior Art Database: 2005-Feb-25
Document File: 2 page(s) / 54K

Publishing Venue

IBM

Related People

Chai, HD: AUTHOR

Abstract

A stepping motor comprises a soft-iron rotor 10 having a rim 12 with a central web 14 securing it to a shaft 16.

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

Control of Electromagnet Stepping Motor

A stepping motor comprises a soft-iron rotor 10 having a rim 12 with a central web 14 securing it to a shaft 16.

The stator 18 comprises complementary cup-shaped shells 20 and 22 having associated pole pieces 24 around their peripheries with operating windings 26, which are pulsed to effect stepping of the rotor.

Instead of having a permanent magnet to provide the usual rotor flux, windings 28 and 30 are provided on internal axial extensions 32 and 34 of the stator, being positioned within the overhanging rim of the rotor. By controlling the energization level of these windings, control of the motor may be had so that the motor can run either in a Variable Reluctance mode or in a Permanent Magnet mode with a variable holding torque. These windings can be pulsed during the dynamic operation for optimum performance.

1

Page 2 of 2

2

[This page contains 2 pictures or other non-text objects]