Browse Prior Art Database

Stored Energy Actuator with Magnetic Focusing Device

IP.com Disclosure Number: IPCOM000053082D
Original Publication Date: 1981-Aug-01
Included in the Prior Art Database: 2005-Feb-12
Document File: 2 page(s) / 62K

Publishing Venue

IBM

Related People

Helinski, EF: AUTHOR

Abstract

A resilient comb of magnetic hammer beams 10 is held in retracted spring-loaded condition against center pole pieces 11 by the magnetic force produced by strip permanent magnets 12 and 13 which are mounted on the top surfaces of the pole pieces 14 and 15, respectively. An impact bar 16 is shown in the first position attached to beam 10 in line with the center pole piece 11. The end of beam 10 extends into a U-shaped channel 17 in the interior surface of a magnetic focusing block 18 supported on permanent magnet 12. This type of focusing device acts to provide more uniform impact forces at extended strokes. This is due to the shift in magnetic flux from the bottom of the beam to the top of the beam when the beam is in its extended stroke position.

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Stored Energy Actuator with Magnetic Focusing Device

A resilient comb of magnetic hammer beams 10 is held in retracted spring- loaded condition against center pole pieces 11 by the magnetic force produced by strip permanent magnets 12 and 13 which are mounted on the top surfaces of the pole pieces 14 and 15, respectively. An impact bar 16 is shown in the first position attached to beam 10 in line with the center pole piece 11. The end of beam 10 extends into a U-shaped channel 17 in the interior surface of a magnetic focusing block 18 supported on permanent magnet 12. This type of focusing device acts to provide more uniform impact forces at extended strokes. This is due to the shift in magnetic flux from the bottom of the beam to the top of the beam when the beam is in its extended stroke position.

Sufficient holding force is provided when beam 10 is in the spring loaded position, as shown in Fig. 2. This is because beam 10 is close to the lower leg 19 of the focusing block and the magnetic force acts inversely with the distance squared.

In the beam's extended stroke position of Fig. 3, the magnetic leakage forces provided through the upper leg 20 of focusing block 18 act to produce an upward force on the beam 10. This upward force can be controlled so that a substantially balanced force condition is achieved so long as coil 21 is energized at a current level which counteracts flux from permanent magnets 12 and 13. This equilibrium condition would be the net res...