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Solenoid Design for Low Power Consumption in the "Hold" Position

IP.com Disclosure Number: IPCOM000088887D
Original Publication Date: 1977-Aug-01
Included in the Prior Art Database: 2005-Mar-04
Document File: 2 page(s) / 47K

Publishing Venue

IBM

Related People

Campbell, AS: AUTHOR [+2]

Abstract

It is highly desirable that a solenoid exert a holding force with either low or no power consumption to thereby reduce temperature rise and power consumption during periods of its hold operation.

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Solenoid Design for Low Power Consumption in the "Hold" Position

It is highly desirable that a solenoid exert a holding force with either low or no power consumption to thereby reduce temperature rise and power consumption during periods of its hold operation.

A drawing of a valve-type solenoid and return spring is illustrated in Fig. 1, wherein the solenoid 10 includes a solenoid body 11, a conventional coil 12, plunger 13 which is mounted for reciprocation in a bore 14 within the body 11, a keeper clip 15 which serves to limit the stroke of the plunger 13, and a return spring 16 which tends to maintain the solenoid in its initial or open position.

The flux path through the metal body of the solenoid is indicated by the arrows 17 as passing between the body, through an air gap 18 and into the plunger 13.

Referring now to Fig. 2, wherein a typical B-H curve illustrates the operational cycle of the solenoid, the solenoid is closed initially by applying a voltage to the coil 12, as at point 20. The magnetic field increases to point 21 causing the solenoid to be closed, and at that point in time voltage energization is removed from the coil, as at 22, allowing the magnetic field intensity to return to zero while the magnetic flux intensity maintains a positive value due to the residual magnetism in the solenoid. The materials and geometry of the solenoid are such that the force due to residual magnetism is sufficient to hold the solenoid closed against the force of...