Gm Global Technolgoy Operations, Inc.

Louis Green

Joseph Pierre Heremans

Dale Lee Partin

Leonid Charles Lev

Donald T Morelli

Christopher Mark Thrush

Dexter Dean Snyder

A transmission device that includes a driving member and a driven member in frictional engagement with the driving member. A traction fluid is included at a contact between the driving and driven members. The traction fluid is a field responsive fluid that is capable of changing its rheological properties in response to an external field.

Field responsive fluids for lubrication and power transmission

A magnetic field sensor apparatus that comprises an active layer of indium antimonide or indium arsenide supported on an elemental semiconductor substrate. Magnetoresistor sensors of indium antimonide and indium arsenide active layers on silicon and germanium substrate wafers are described. Means are described for providing reduced electric fields and parasitic conduction in the elemental semiconductor substrate. The means includes unique device geometries and buffer layers between the active layers and the substrate wafers.

Magnetic field sensor on elemental semiconductor substrate with electric

For increased sensitivity, an improved position sensor includes a magnetic circuit in which the stationary portion includes a permanent magnet whose width is optimally 1.5 times the tooth pitch of the exciter portion of the sensor and the magnet face proximate the exciter includes a thin layer of ferromagnetic material over which is centered a narrow magnetic sensing element, such as a magnetoresistor. The sensing element has a width typically less than the tooth width. The sensing element includes a thin film of a monocrystalline semiconductive material, preferably having only a moderate bulk mobility and a larger band gap, such as indium arsenide. Current carriers flow along the length of the thin film in a surface accumulation layer, effective to provide a significant apparent increase in mobility and conductivity of said semiconductive material, and an actual increase in magnetic sensitivity and temperature insensitivity. The flux density is typically applied by appropriate magnet thickness or choice of magnet material without the need of a flux guide.

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Rochester Hills, MI, United States of America

Louis Green