Proportional solenoid
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United States of America Patent
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-
Mar 17, 1987
Grant Date -
N/A
app pub date -
Nov 7, 1984
filing date -
Nov 7, 1984
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A solenoid having a high degree of proportionality. A stationary pole is disposed within an electromagnetic coil and forms part of a flux path. An armature slides into and out of a bore of the pole and forms another part of the flux path. The armature has walls which define an axial recess formed in the armature face adjacent the pole. The armature walls have a cross-sectional thickness which decreases in a direction toward the bore. The walls of the pole bore have a cross-sectional thickness which decreases in a direction toward the armature. An air gap is formed between the decreasing thickness pole bore walls and armature walls which air gap remains substantially constant in the radial dimension as the armature slides.
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