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Browse Prior Art Database

Magnetic Actuator

IP.com Disclosure Number: IPCOM000077505D
Original Publication Date: 1972-Aug-01
Included in the Prior Art Database: 2005-Feb-25
Document File: 2 page(s) / 39K

Publishing Venue

IBM

Related People

Kluada, FP: AUTHOR

Abstract

This magnetic actuator holds a soft magnetic body in a plane of unstable equilibrium by a steady state magnetic field and moves the soft magnetic body, by moving the plane of unstable equilibrium back and forth by an alternating magnetic field.

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Magnetic Actuator

This magnetic actuator holds a soft magnetic body in a plane of unstable equilibrium by a steady state magnetic field and moves the soft magnetic body, by moving the plane of unstable equilibrium back and forth by an alternating magnetic field.

The magnetic actuator includes soft magnetic H-shaped yoke 10, permanent magnets 11, and pole pieces 12 and 13. Permanent magnets 11 set up the steady state magnetic field and establish a plane of unstable equilibrium. The alternating magnetic field for moving the plane of unstable equilibrium back and forth, is developed by supplying an AC current to coils 21 and 22. The interaction of the steady state magnetic field and the alternating magnetic field moves the plane of unstable equilibrium back and forth, and thereby moves pellets 15 back and forth.

The magnetic pellets 15 can be contained in a cartridge 16 as shown in Fig. 1, or they can be supported by wire springs 17 as shown in Fig. 2.

The magnetic actuator can be incorporated into a printer for example, where the pellets can either act as print hammers or print elements of a matrix printer. For such an application, pellets 15 normally reside in a home position. At print time, coils 21 and 22 would be energized with an AC signal to move pellets 15 from the home position to the print position and back to the home position. Of course, the mechanical forces resulting from the interaction of the steady state and alternating magnetic fields can be used i...