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Misalignment Correction in a Permanent Magnet Stepping Motor

IP.com Disclosure Number: IPCOM000060797D
Original Publication Date: 1986-May-01
Included in the Prior Art Database: 2005-Mar-09
Document File: 2 page(s) / 72K

Publishing Venue

IBM

Related People

Krimm, DL: AUTHOR

Abstract

Correction of a small amount of "one phase on" step error in a permanent magnet stepping motor is accomplished by correcting misalignment of the cans in the permanent magnet stepping motor. A permanent magnet stepping motor 1 includes a rotor magnet 2, inner cans 3 and 4, and outer cans 5 and 6. Windings 7 are disposed between the cans 4 and 6, and windings 8 are disposed between the cans 3 and 5. The inner cans 3 and 4 are fastened to each other by any suitable means. Portions of the inner can 3 are interleaved with portions of the outer can 5, and portions of the inner can 4 are interleaved with portions of the outer can 6. The outer can 5 is supported by a mounting plate 9, and the outer can 6 is supported by a rear bearing plate 10.

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Misalignment Correction in a Permanent Magnet Stepping Motor

Correction of a small amount of "one phase on" step error in a permanent magnet stepping motor is accomplished by correcting misalignment of the cans in the permanent magnet stepping motor. A permanent magnet stepping motor 1 includes a rotor magnet 2, inner cans 3 and 4, and outer cans 5 and 6. Windings 7 are disposed between the cans 4 and 6, and windings 8 are disposed between the cans 3 and 5. The inner cans 3 and 4 are fastened to each other by any suitable means. Portions of the inner can 3 are interleaved with portions of the outer can 5, and portions of the inner can 4 are interleaved with portions of the outer can 6. The outer can 5 is supported by a mounting plate 9, and the outer can 6 is supported by a rear bearing plate 10. After final assembly of the motor 1, an inner can assembly clamp 11 clamps tightly upon the assembly of the inner cans 3 and 4. Then, wires 12 and 13 are connected to the windings 8 to determine the back emf during rotation of the rotor magnet 2 by rotating the shaft (not shown) of the motor 1. This enables detection of the spacing between zero points of the back emf signals between the wires 12 and 13. Then, clamps 14 and 15, which cooperate with the outer cans 5 and 6, respectively, grasp the outer cans 5 and 6 and rotate each separately with respect to the inner cans 3 and 4, which are held against motion by the clamp 11. The amount of rotation of each of the outer ca...