MAGNETIC POSITION SENSOR FOR A MOBILE OBJECT WITH LIMITED LINEAR TRAVEL

• US 20070120556A1
• Filed: 11/27/2006
• Published: 05/31/2007
• Est. Priority Date: 11/29/2005
• Status: Abandoned Application

• Current Assignee: Electricfil Automotive
• Original Assignee: Electricfil Automotive
• Inventors: DUFOUR, Laurent, LEGRAND, Bertrand
• Application Number:
  US11/563,295
• Publication Number:
  US 20070120556A1
• Time in Patent Office: Days
• US Class Current: 324/207.240
• CPC Class Codes: G01D 5/145 influenced by the relative movement between the Hall device and magnetic fields see G01R33/06

Abstract

A magnetic sensor including a first resource (3) for the creation of a magnetic field, oriented along a first axis in the direction of the axis of movement, and a second resource (6) for the creation of a magnetic field, oriented along a second axis in the direction of the axis of movement, opposed to the first direction. The first and second field-creation resources are mounted opposite to each other in order to form, between them, a magnetic measuring gap in which the measuring element that is sensitive to the value of the magnetic flux generated by the first and second field-creation resources is located, with the measuring element or the first and second field-creation resources being linked to the mobile object.

Claims

1. A magnetic sensor to determine the position of a mobile object with a limited linear travel along an axis of movement, where the sensor includes a measuring element (11) that is sensitive to the value of a magnetic flux, and designed to measure the value, and/or the variations in value, of the magnetic flux, so as to determine the linear position of the mobile object along the axis of movement, the sensor comprising:

a first resource (3) for the creation of a magnetic field oriented along a first axis in the direction of the axis of movement, and

a second (6) resource for the creation of a magnetic field oriented along a second axis in the direction of the axis of movement, opposite to the first direction, with the first and second field-creation resources being mounted opposite to each other in order to form, between them, a magnetic measuring gap in which the measuring element that is sensitive to the value of the magnetic flux generated by the first and second field-creation resources is located, with the measuring element or the first and second field-creation resources being linked to the mobile object.

2. A magnetic sensor according to claim 1, wherein the first (3) and second (6) field-creation resources take the form of magnets mounted in magnetic opposition in relation to each other.

3. A magnetic sensor according to claim 2, wherein the magnets (3, 6) are associated with a magnetic circuit (12).

4. A magnetic sensor according to claim 1, wherein the measuring element (11) is a cell which is mounted so as to be sensitive to a magnetic field that is oriented along the axis of movement (T).

5. A magnetic sensor according to claim 1, wherein the measuring element (11) is linked to the mobile object.

6. A magnetic sensor according to claim 1, wherein the first and second field-creation resources (3, 6) are linked to the mobile object.

7. An electric braking device for a motor vehicle, including at least one magnetic sensor (1) according to claim 1.