Position sensor

• US 20080303515A1
• Filed: 06/05/2007
• Published: 12/11/2008
• Est. Priority Date: 06/05/2007
• Status: Abandoned Application

• Current Assignee: Max W. Garwood, Ronald J. Wolf
• Original Assignee: Max W. Garwood, Ronald J. Wolf
• Inventors: Wolf, Ronald J., Garwood, Max W.
• Application Number:
  US11/810,298
• Publication Number:
  US 20080303515A1
• Time in Patent Office: Days
• US Class Current: 324/207.24
• CPC Class Codes: G01B 7/003 for measuring position, not involving coordinate determination coordinate measuring G01B7/004
• CPC Class Codes: G01D 5/145 influenced by the relative movement between the Hall device and magnetic fields see G01R33/06

Abstract

A position sensor including at least one magnet producing a magnetic field, at least one magnetic flux sensing device sensing the magnetic field, and a ferrous sleeve. The ferrous sleeve being rotatable about a longitudinal axis of the magnet. The magnetic field detected by the magnetic flux sensing device being substantially unaffected by rotation of the ferrous sleeve relative to the magnet.

Claims

1. A position sensor, comprising:

at least one magnet producing a magnetic field;

at least one magnetic flux sensing device sensing said magnetic field; and

a ferrous sleeve rotatable about a longitudinal axis of said magnet, said magnetic field detected by said magnetic flux sensing device being substantially unaffected by rotation of said ferrous sleeve relative to said magnet.

2. The position sensor of claim 1, wherein said ferrous sleeve has a longitudinal axis, said ferrous sleeve being movable along said longitudinal axis.

3. The position sensor of claim 2, wherein said longitudinal axis of said magnet is substantially parallel to said longitudinal axis of said ferrous sleeve.

4. The position sensor of claim 3, wherein said longitudinal axis of said magnet is co-linear with said longitudinal axis of said ferrous sleeve.

5. The position sensor of claim 2, wherein said ferrous sleeve rotates about said longitudinal axis.

6. The position sensor of claim 1, wherein said magnet has a longitudinal axis, said magnet being movable along said longitudinal axis.

7. The position sensor of claim 6, wherein said ferrous sleeve has a first end and a second end, said magnet movable at least from said first end to said second end.

8. The position sensor of claim 6, wherein said ferrous sleeve has a longitudinal axis substantially parallel to said longitudinal axis of said magnet.

9. The position sensor of claim 8, wherein said longitudinal axis of said magnet is collinear with said longitudinal axis of said ferrous sleeve.

10. The position sensor of claim 8, wherein said ferrous sleeve is rotatable about said longitudinal axis.

11. The position sensor of claim 6, wherein said magnet is rotatable about said longitudinal axis.

12. A position sensor, comprising:

a magnet;

at least one magnetic flux sensing device in a fixed position relative to said magnet; and

a ferrous sleeve rotatable about said magnet.

13. The position sensor of claim 12, wherein said ferrous sleeve has a longitudinal axis, said ferrous sleeve being movable along said longitudinal axis.

14. The position sensor of claim 13, wherein said magnet has a longitudinal axis substantially parallel to said longitudinal axis of said ferrous sleeve.

15. The position sensor of claim 14, wherein said longitudinal axis of said magnet is co-linear with said longitudinal axis of said ferrous sleeve.

16. The position sensor of claim 13, wherein said magnet is rotatable about said longitudinal axis.

17. A position sensor, comprising:

a magnet;

a ferrous sleeve, said magnet and said ferrous sleeve rotatable relative to each other; and

at least one magnetic flux sensing device in a fixed position relative to a linear position of said ferrous sleeve.

18. The position sensor of claim 17, wherein said magnet has a longitudinal axis, said magnet being movable along said longitudinal axis.

19. The position sensor of claim 18, wherein said ferrous sleeve has a longitudinal axis, said longitudinal axis of said magnet being substantially parallel to said longitudinal axis of said ferrous sleeve.

20. The position sensor of claim 17, wherein said magnet is rotatable about said longitudinal axis.