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Attracting Permanent Magnet

IP.com Disclosure Number: IPCOM000046693D
Original Publication Date: 1983-Aug-01
Included in the Prior Art Database: 2005-Feb-07
Document File: 2 page(s) / 55K

Publishing Venue

IBM

Related People

Chladek, TG: AUTHOR [+4]

Abstract

A magnetic actuator is used for applying variable peak follow-up pressure to a movable electrode in a resistance welder. The pressure applied during the resistance welding process is developed using the combination of a positive driving force and a magnetic breakaway force. The magnetic force which must be overcome by the driving force is developed first by a permanent magnet and additional magnetic force is provided by an electromagnet. Further, the air gap between the armature and the permanent magnet and electromagnet can be varied so as to vary the amount of force exerted upon the movable electrode of the resistance welder. In Fig. 1, there are a plurality of armatures 50 fixed to a freely movable shaft 55 which at one end bears against platen 56. Platen 56 carries the movable electrode 10.

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Attracting Permanent Magnet

A magnetic actuator is used for applying variable peak follow-up pressure to a movable electrode in a resistance welder. The pressure applied during the resistance welding process is developed using the combination of a positive driving force and a magnetic breakaway force. The magnetic force which must be overcome by the driving force is developed first by a permanent magnet and additional magnetic force is provided by an electromagnet. Further, the air gap between the armature and the permanent magnet and electromagnet can be varied so as to vary the amount of force exerted upon the movable electrode of the resistance welder. In Fig. 1, there are a plurality of armatures 50 fixed to a freely movable shaft 55 which at one end bears against platen 56. Platen 56 carries the movable electrode 10. The number of armatures 50 can vary depending upon the particular requirements of the welder. The armatures 50 are spaced from permanent magnets 100, which are encircled by an associated electromagnet 110. The air gap 90 is adjustable by the combination of a motor drive 80 and jam nut 85. When the movable electrode 10 is driven via the platen 56 into contact with the pieces 20 to be welded and thereby holds pieces 20 against fixed electrode 25, shaft 55 resists movement because of the magnetic force attracting armatures 50. The amount of force to overcome the attracting force then becomes the pressure which is applied to the pieces 20 via the mo...