Drive and position sensor for a driven part
First Claim
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1. A drive and sensor for positioning and sensing the position of driven parts comprising:
- a stationary housing;
a drive means including a rotating output shaft having an axial recess for positioning a driven part;
primary and secondary coaxial coils in said axial recess;
magnetic core inside said axial recess and movable along the axis of and across said coils;
a reducing gear means including a threaded bushing and a threaded part threadably interacting for converting rotary motion of said shaft to axial motion of the core with respect to said coils to generate a voltage in said secondary coil corresponding to the position of said driven part when alternating voltage is applied to said primary coil;
means for mounting said threaded bushing to rotate with said shaft; and
means for mounting said coils and threaded part rotationally stationary with respect to said housing.
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Abstract
A drive and position sensor having a drive shaft for positioning a driven part and connected to a magnetic core by a reduction gear to position the core axially relative to a primary and secondary coil so that the voltage in the secondary coil is a measure of the position of the driven part.
11 Citations
12 Claims
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1. A drive and sensor for positioning and sensing the position of driven parts comprising:
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a stationary housing; a drive means including a rotating output shaft having an axial recess for positioning a driven part; primary and secondary coaxial coils in said axial recess; magnetic core inside said axial recess and movable along the axis of and across said coils; a reducing gear means including a threaded bushing and a threaded part threadably interacting for converting rotary motion of said shaft to axial motion of the core with respect to said coils to generate a voltage in said secondary coil corresponding to the position of said driven part when alternating voltage is applied to said primary coil; means for mounting said threaded bushing to rotate with said shaft; and means for mounting said coils and threaded part rotationally stationary with respect to said housing. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A drive and sensor for positioning and sensing the position of driven parts comprising:
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a housing; a driving means including a hollow shaft having first and second ends for positioning a driven part; primary and secondary coaxial coils; a carrier shell fastened to said housing adjacent said first end of said hollow shaft and extending with said primary and secondary coils mounted thereon into said hollow shaft; a guide bushing mounted to said carrier shell and having a non-circular cross-section opening; a magnetic core movable along the axis of and across said coils, and having non-circular cross-section extending through said opening of said guide bushing so as to move axially and not rotationally with respect to said guide bushing and said carrier shell; and a reducing gear means connected said hollow shaft and said core for axially adjusting said core with respect to said coils in response to said driving means to generate a voltage in said secondary coil corresponding to the position of said driven part when alternating voltage is applied to said primary coil. - View Dependent Claims (9, 10, 11, 12)
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Specification