WO1998044313B1 - Magnetically actuated control device - Google Patents

Magnetically actuated control device

Info

Publication number
WO1998044313B1
WO1998044313B1 PCT/US1998/005758 US9805758W WO9844313B1 WO 1998044313 B1 WO1998044313 B1 WO 1998044313B1 US 9805758 W US9805758 W US 9805758W WO 9844313 B1 WO9844313 B1 WO 9844313B1
Authority
WO
WIPO (PCT)
Prior art keywords
magnetic
control device
magnet
magnetic portion
disposed
Prior art date
Application number
PCT/US1998/005758
Other languages
French (fr)
Other versions
WO1998044313A1 (en
Filing date
Publication date
Priority claimed from US08/832,269 external-priority patent/US5850142A/en
Application filed filed Critical
Priority to AU65819/98A priority Critical patent/AU6581998A/en
Publication of WO1998044313A1 publication Critical patent/WO1998044313A1/en
Publication of WO1998044313B1 publication Critical patent/WO1998044313B1/en

Links

Abstract

A control device (60) useful for adjusting the position, velocity, or acceleration of an apparatus is provided. The control device (60) includes a shaped integral magnet (14) having outer walls of a desired curvature. Radially disposed about the outer walls are one or more magnetic sensors (24). Movement of the magnet (14) changes the magnetic flux passing through the sensors (24), generating a unique transfer function output signal useful to control the apparatus. By varying the curvature of the outer walls, the transfer function voltage curve is tailored for specific applications.

Claims

AMENDED CLAIMS
[received by the International Bureau on 15 October 1998 (15.10.98); original claims 1, 3, 7-8, 14, 18 and 19 amended; remaining claims unchanged (4 pages)]
1. A control device (40), characterized by: a component (10) having a magnetic portion
(14) , said magnetic portion (14) having uniformly convex sidewalls that terminate at opposing polar portions symmetrically disposed about an axially disposed hole (12) , said magnetic portion (14) further having a shape effective to provide a desired transfer function and a construction effective to minimize magnetic flux distortion, cross talk and hysteresis; a shaft (42) extending into said hole (12) ; at least one non-magnetic bushing (46) supporting said component (10) ; and at least one magnetic sensor (24) disposed adjacent to said magnetic portion (14) .
2. The control device (40) of characterized in that said magnetic portion (14) is comprised of a uniform mixture of magnetic powders dispersed in a polymeric matrix.
3. The control device (40) of claim 2 characterized in that said polar portions are planar.
■24-
7. A control device (60), characterized by: a component (10) having a magnetic portion (14) , said magnetic portion (14) having uniformly convex sidewalls that terminate at polar portions symmetrically disposed about an axially disposed hole (12) , said magnetic portion (14) further having a shape effective to provide a desired transfer function and a construction effective to minimize magnetic flux distortion, cross talk and hysteresis; a hollow shaft (42') having first and second opposing ends and extending through said hole (12) ; a handle (44) disposed at said first end of said hollow shaft (42'); a first magnet (68) disposed within said hollow shaft (42') in displacement from said component (10); at least one first magnetic sensor (24) disposed adjacent to said magnetic portion (14) ; and at least one second magnetic sensor (70) mounted to said hollow shaft (42') in apposition to said first magnet (14) .
8. The control device of claim 7 characterized in that said first magnet (68) is generally shaped as a cylinder and has north and south poles disposed along sidewalls of said cylinder.
9. The control device (60) of claim 8 characterized in that said first (24) and said second (70) magnetic sensors are Hall effect sensors.
-25-
14. The control device (60) of claim 13 characterized in that said opposing polar portions are planar.
15. The control device (60) of claim 14 characterized in that opposing ones of said planar polar portions are separated by a distance effective to provide said control device (60) with a desired angle of rotation.
16. The control device (60) of claim 15 characterized in that said magnetic portion (14) is coated with a low coefficient of friction polymer (22) .
17. The control device (60) of either claim 13 or claim 16 characterized in that said magnetic portion (14) has walls with first (26) and second (28) convex portions adjacent to respective north and south poles and a concave portion (30) disposed between said first (26) and second (28) convex portions.
-26
18. A control device (10), characterized by: a magnet in combination with one or more magnetic sensors, said magnet having a shape that is effective to provide an essentially linear relationship with said one or more magnetic sensors between angle position and magnetic flux density and a construction effective to minimize magnetic flux distortion, cross talk and hysteresis, said magnet being formed from a uniform mixture of magnetic powders dispersed in a polymeric matrix wherein said magnet has a shape that is essentially spheroidal with uniformly convex sidewalls that terminate at opposing polar portions.
19. The control device (10) of claim 18 characterized in that said magnet is coated with a low coefficient of friction polymer (22) .
-27- STATEMENT UNDER ARTICLE 19
In reference to the above-identified International Application, this is a response to the International Search Report under PCT Article 18 and Rules 43 and 44 mailed 24 August, 1998 having a two month period for response that is set to expire on 24 October, 1998. Replacement pages 18, 20, 22 and 23 are provided to replace pages 18, 20, 22 and 23 as originally filed with the International Application. As a result of this amendment, claims 1, 3, 7, 8, 14, 18 and 19 have been amended. The remaining claims are unchanged.
As a result of this amendment, the independent claims have been amended to more precisely identify that the magnetic portion has uniformly convex walls that terminate at opposing polar portions. This limitation appeared originally in dependent claim 3 that the search report did not apply any references against. Accordingly, it is solicited that all claims should now be eligible for a favorable evaluation in the written opinion.
JP 58-66381 discloses a non-magnetic spheroidal member containing an embedded cylindrical magnet. Rotation of the spheroidal member in the presence of a magnetic sensor generates a sinusoidal output. The reference discloses that electronic signal processing is required to convert the sinusoidal output to a linear output.
There is nothing in JP 58-66381 to teach or suggest applicant's invention where a magnetic portion has uniformly convex sidewalls such that a constant air gap is maintained when the magnetic portion is rotated and a linear relationship exists between angle position and magnetic flux density without the need for electronic signal processing.
Favorable consideration in the written opinion is respectfully solicited.
-28-
PCT/US1998/005758 1997-04-03 1998-03-25 Magnetically actuated control device WO1998044313A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU65819/98A AU6581998A (en) 1997-04-03 1998-03-25 Magnetically actuated control device

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US08/832,269 1997-04-03
US08/832,269 US5850142A (en) 1997-04-03 1997-04-03 Control device having a magnetic component with convex surfaces

Publications (2)

Publication Number Publication Date
WO1998044313A1 WO1998044313A1 (en) 1998-10-08
WO1998044313B1 true WO1998044313B1 (en) 1998-12-03

Family

ID=25261176

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US1998/005758 WO1998044313A1 (en) 1997-04-03 1998-03-25 Magnetically actuated control device

Country Status (4)

Country Link
US (1) US5850142A (en)
AU (1) AU6581998A (en)
TW (1) TW486664B (en)
WO (1) WO1998044313A1 (en)

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