Browse Prior Art Database

Pocket Selector

IP.com Disclosure Number: IPCOM000090053D
Original Publication Date: 1969-Jan-01
Included in the Prior Art Database: 2005-Mar-05
Document File: 2 page(s) / 35K

Publishing Venue

IBM

Related People

Meier, JH: AUTHOR

Abstract

This electromagnetic actuator requires low electrical power input for the mechanical inertias and accelerations involved. Low electrical input power is achieved through mechanical energy storage. This is maximum in the two extreme positions of the actuator and zero in the mid-position. Low input power is achieved by a relatively efficient and low-inertia electromagnetic driving arrangement which uses an attraction repulsion principle, has closed magnetic flux paths in the home positions, and avoids the need for moving coils.

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Pocket Selector

This electromagnetic actuator requires low electrical power input for the mechanical inertias and accelerations involved. Low electrical input power is achieved through mechanical energy storage. This is maximum in the two extreme positions of the actuator and zero in the mid-position. Low input power is achieved by a relatively efficient and low-inertia electromagnetic driving arrangement which uses an attraction repulsion principle, has closed magnetic flux paths in the home positions, and avoids the need for moving coils.

U-shaped magnets 3 and 5 are continuously energized with the polarities indicated by N and S and can either be permanent magnets as shown or continuously energized electromagnets. A third U-shaped magnet is provided by a soft iron core sleeve 7 which is mounted on shaft 9. Sleeve 7 has two tabs or legs 11 and 13 which project into the space between magnets 3 and 5. Coil 15 surrounds sleeve 7 and is arranged so that the operating current supplied to it is reversible. In a different arrangement, two coils with opposite direction of current flow can be energized alternately.

The assembly is biased to a neutral or center position by biasing spring 17. The latter tends to center shafts so that the tabs 11 and 13 are in mid-position between magnets 3 and 5. If coil 15 is now energized such that tab 11 becomes polarized North and tab 13 becomes polarized South, magnetic attraction between magnet 3 and the tabs causes the tabs to move...