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Stepping Motor Structure

IP.com Disclosure Number: IPCOM000080126D
Original Publication Date: 1973-Jan-01
Included in the Prior Art Database: 2005-Feb-27
Document File: 2 page(s) / 92K

Publishing Venue

IBM

Related People

Abraham, DG: AUTHOR [+4]

Abstract

A stepping motor is described in which the motor surrounds and rotates about the stator. Only a small number of parts are required. The motor has external projections suitable for engaging spaced holes in a movable paper web, to provide a self-contained paper feed apparatus.

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Stepping Motor Structure

A stepping motor is described in which the motor surrounds and rotates about the stator. Only a small number of parts are required. The motor has external projections suitable for engaging spaced holes in a movable paper web, to provide a self-contained paper feed apparatus.

The figures illustrate the structure of a balanced stepping motor. A cylindrical rotor with nonmagnetic end caps is mounted by bearings for rotation on a fixed shaft. The shaft carries two identical stator elements, each consisting of four spokes each with a coil. The coils are sequentially energized to provide operating flux for the motor.

A cylindrical permanent magnet provides a biasing flux for the motor. The permanent magnet is supported on the shaft by a flux guiding member to steer the flux, as shown.

The spokes of the stator have enlarged ends carrying radial stator teeth. The motor has internal radial rotor teeth corresponding in dimension to the stator teeth. The stator elements are skewed 1#4 tooth pitch with respect to each other.

Drive pins projecting around the outer surface of the rotor enable the motor to feed a paper web.

As an alternative, the stepping motor may be single ended with only one stator element.

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