Magneto-strictive torque sensor

Details Magneto-strictive torque sensor Magneto-strictive torque sensor

1989-06-05

1990-06-12

Budd, Mark O.

Electrical generator or motor structure

Dynamoelectric

Reciprocating

7386236, 73660, 73DIG2, H01L 4112

Patent

active

049335804

ABSTRACT:
A magneto-strictive torque sensor for electrically contactlessly detecting a torque applied to a rotary shaft on the basis of a resulting change in the magnetic permeability of the surface of the shaft. Fine dents and retainer areas for retaining residual compressive stress due to the fine dents are formed on the surface of the rotary shaft. According to this arrangement, the process of magnetization resulting from the application of an exciting magnetic field and of the torque to the rotary shaft involves less magnetization due to magnetic domain wall displacement and consists principally of reversible magnetic rotation, with the result of reduced hysteresis in the magnetization process. The reduced hysteresis causes less hysteresis involved in torque detection and higher detection sensitivity, thus resulting in high accuracy of torque detection. Further, by working the surface of the rotary shaft for the purpose of forming the fine dents thereon, microdefects present on the surface layer of the rotary shaft are reduced or eliminated and thus reduced hysteresis and improved sensitivity can be attained in the process of torque detection.

REFERENCES:
patent: 3464042 (1969-08-01), Raman
patent: 3505657 (1970-04-01), Whitehouse
patent: 4122708 (1978-10-01), Maier
patent: 4694902 (1987-09-01), Hormansdorfer
patent: 4716556 (1987-12-01), Raskin et al.

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