US 7,511,475 B2
	Mobile member speed sensor
Christophe Maerky, Saint-Ouen L'Aumone (France); Geraint Jewell, Owlthorpe Sheffield (United Kingdom); Richard Clark, Sheffield (United Kingdom); and Paul Stewart, Sheffield (United Kingdom)
Assigned to Valeo Systemes de Controle Moteur, Osny (France)
Appl. No. 10/537,267 PCT Filed Dec. 01, 2003, PCT No. PCT/FR03/03541 § 371(c)(1), (2), (4) Date Apr. 14, 2006, PCT Pub. No. WO2004/053502, PCT Pub. Date Jun. 24, 2004.
Claims priority of application No. 02 15130 (FR), filed on Dec. 02, 2002.
Prior Publication US 2006/0208842 A1, Sep. 21, 2006
Int. Cl. G01B 7/14 (2006.01)

U.S. Cl. 324—207.15  [324/207.22; 324/207.24; 123/90.11]

3 Claims

1. A speed sensor for a moving member, the sensor comprising means for constituting a magnetic singularity on a portion of the moving member, and a sleeve slidably receiving said portion and including annular coils and a tubular body having two magnetic assemblies mounted in opposition to each other on a common axis, which assemblies are separated by a ferromagnetic spacer, each having one of the coils and, on its side remote from the spacer, an annular pole piece in such a manner that the spacer, the coils, and the pole pieces form a housing for slidably receiving the portion of the moving member that presents the magnetic singularity, each magnetic assembly comprises an annular permanent magnet disposed on a common axis between the annular pole pieces and mounted around its coil, the magnetic singularity, the coils, and the permanent magnets being arranged so that the coils provide a linear signal that is independent of the position of the moving member.