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Browse Prior Art Database

Low Cost Moving Coil Linear Actuator

IP.com Disclosure Number: IPCOM000087615D
Original Publication Date: 1977-Feb-01
Included in the Prior Art Database: 2005-Mar-03
Document File: 2 page(s) / 68K

Publishing Venue

IBM

Related People

Rusch, KD: AUTHOR [+2]

Abstract

The linear actuator comprises a housing A of magnetically permeable material having an outer housing portion 10 connected with an inner core 12 by a rear end bell portion. Three arc-shaped magnet segments 16, 18 and 20 are held in contact with the inner surface of housing portion 10 by means of a tube 22 bearing against the inner surfaces of magnets 16, 18 and 20. A bobbin B carrying an electric winding 38 is movable into housing A between tube 22 and core 12 and may be connected with any suitable driven member (not shown) to which movement is desired to be given in accordance with the movement of bobbin B. Tube 22 is of a conducting metal, such as aluminum or copper, so that tube 22 functions not only as a retainer for magnets 16, 18 and 20 but, also, as a shorted turn.

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Low Cost Moving Coil Linear Actuator

The linear actuator comprises a housing A of magnetically permeable material having an outer housing portion 10 connected with an inner core 12 by a rear end bell portion. Three arc-shaped magnet segments 16, 18 and 20 are held in contact with the inner surface of housing portion 10 by means of a tube 22 bearing against the inner surfaces of magnets 16, 18 and 20. A bobbin B carrying an electric winding 38 is movable into housing A between tube 22 and core 12 and may be connected with any suitable driven member (not shown) to which movement is desired to be given in accordance with the movement of bobbin B. Tube 22 is of a conducting metal, such as aluminum or copper, so that tube 22 functions not only as a retainer for magnets 16, 18 and 20 but, also, as a shorted turn.

The magnets 16, 18 and 20 have their north poles on their inner surfaces in contact with tube 22, and the magnetic flux lines F extend radially from the magnets to inner core 12. Core 12, outer housing portion 10, and the rear end bell portion are preferably integral with each other and may be of any suitable magnetic material, such as iron, to complete the magnetic circuit. Housing A may be anchored by mounting side flanges 26 and 28. Bobbin B comprises an end portion 30, longitudinally extending rib portions 32 and relatively thin portions 34 extending between ribs 32. Electric winding 38 is disposed in a groove formed within bobbin B. Electric terminals 40,...