Browse Prior Art Database

Self-Locating and Adhering Flux Shield

IP.com Disclosure Number: IPCOM000046907D
Original Publication Date: 1983-Aug-01
Included in the Prior Art Database: 2005-Feb-07
Document File: 2 page(s) / 81K

Publishing Venue

IBM

Related People

Bakken, WP: AUTHOR [+2]

Abstract

Flux shield 10 is located in proper position on motor 12 containing permanent magnets 14 by moving it over the outside shorted turn 16 on the end of motor 12 and is held in place by the magnetic field from magnets 14 that it is shielding. Motor 12 provides a magnetic circuit for magnets 14 which is closed except for gap 18 and includes outside ring 20a, core with end bell 20b and magnet support ring 20c. There are four of the magnets 14 distributed in equally spaced relation about the axis of core 20b and supported by ring 20c. Outside shorted turn 16 is located on one end of motor 12. A hollow coil 24 is provided in gap 18 and is connected by carriage 25 with transducer 26 disposed in close data transferring disposition with respect to a surface of magnetic disk 28.

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Self-Locating and Adhering Flux Shield

Flux shield 10 is located in proper position on motor 12 containing permanent magnets 14 by moving it over the outside shorted turn 16 on the end of motor 12 and is held in place by the magnetic field from magnets 14 that it is shielding. Motor 12 provides a magnetic circuit for magnets 14 which is closed except for gap 18 and includes outside ring 20a, core with end bell 20b and magnet support ring 20c. There are four of the magnets 14 distributed in equally spaced relation about the axis of core 20b and supported by ring 20c. Outside shorted turn 16 is located on one end of motor 12. A hollow coil 24 is provided in gap 18 and is connected by carriage 25 with transducer 26 disposed in close data transferring disposition with respect to a surface of magnetic disk 28. As the current through coil 24 is varied, coil 24 moves axially in one direction or the other on core 20b through the magnetic field produced by magnets 14, thus moving transducer 26 radially across disk 28. Preferably, due to space restrictions, motor 12 is located as close as possible to disk 28, and this requires that the leakage flux density from magnets 14 be controlled so that the data transfer between disk 28 and transducer 26 is not degraded by the flux from magnets 14. Flux shield 10 accomplishes this and contains the flux from magnets 14 rather than simply deflecting it. Shield 10 is a simple stamped steel part and is located on motor 12 simply by slip...