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Browse Prior Art Database

Moving Coil - Pneumatic Actuator

IP.com Disclosure Number: IPCOM000097416D
Original Publication Date: 1962-Nov-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 2 page(s) / 40K

Publishing Venue

IBM

Related People

Lee, EJ: AUTHOR

Abstract

This is a two-position moving coil actuator used to obtain first and second positions of a mechanically linked member. The actuator utilizes a pressure differential to establish one of the two stable positions and also to cool the coil bobbin.

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Moving Coil - Pneumatic Actuator

This is a two-position moving coil actuator used to obtain first and second positions of a mechanically linked member. The actuator utilizes a pressure differential to establish one of the two stable positions and also to cool the coil bobbin.

Permanent magnet 1 is disposed within closed actuator housing 2. Coil leads 3, entering housing 2 through pivoted face plate 4, are wound around bobbin 5 in only one direction. Inlet port 6 admits either air pressure or a vacuum to the inside of housing 2 from pneumatic devices (not shown). The pressure differential between the inside of housing 2 and the outside of plate 4 creates a bias force which establishes a first stable position for the actuator.

When current passes through leads 3, magnet 1 acts on the magnetic flux created by the coil and moves the pivoted face plate to a second stable position. This is against the bias established by the pressure differential. Subsequent release of the current in the coil causes the pressure differential to return plate 4 to its first position. In addition to creating the bias force, the pressure differential cools the coil as a result of the air flow through the housing, providing more efficient operation.

The pressure bias can also be used in conjunction with a two-coil bobbin in which both positions are established by current flowing in one of two oppositely wound coils. In such a case, the pressure bias aids in one position and opposes in the s...