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Plastic Bobbin with Metal Heat Sink

IP.com Disclosure Number: IPCOM000048133D
Original Publication Date: 1981-Dec-01
Included in the Prior Art Database: 2005-Feb-08
Document File: 2 page(s) / 39K

Publishing Venue

IBM

Related People

Pennell, GF: AUTHOR [+2]

Abstract

A bobbin for the coil of an electromagnet uses separate conductive aluminum strips 10 embedded in plastic core elements 11 extending between plastic flanges 12 and 13. The core elements 11 and flanges 12 and 13 are pre-molded with the strips 10 in place. As seen in Fig. 2, strips 10 extend beyond flange 13 to form heat radiating fins 14 which can be cooled by convection. An electrically insulating, thermally conductive filler material 15, such as thermal grease, is applied to both sides of strips 10 in the spaces between core elements 17. Filler material 15 is applied to the outer side of strips 10 prior to the winding of the coil conductor 16 so as to make contact with the inner portion of the coil for heat transfer to strips 10.

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Plastic Bobbin with Metal Heat Sink

A bobbin for the coil of an electromagnet uses separate conductive aluminum strips 10 embedded in plastic core elements 11 extending between plastic flanges 12 and 13. The core elements 11 and flanges 12 and 13 are pre- molded with the strips 10 in place. As seen in Fig. 2, strips 10 extend beyond flange 13 to form heat radiating fins 14 which can be cooled by convection. An electrically insulating, thermally conductive filler material 15, such as thermal grease, is applied to both sides of strips 10 in the spaces between core elements
17. Filler material 15 is applied to the outer side of strips 10 prior to the winding of the coil conductor 16 so as to make contact with the inner portion of the coil for heat transfer to strips 10. Filler material 15 may be applied to the inner surfaces of strips 10 prior to assembly of the coil onto a magnetic core 17.

This configuration provides cooling to the inner windows of coil 16 so as to eliminate uneven temperature build-up within the coil. Heat may be conducted from the coil through the aluminum strips to the iron core as well as to the radiating fins.

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