Magnetostriction type torque sensor

Details Magnetostriction type torque sensor Magnetostriction type torque sensor

1993-02-02

1994-06-21

Chilcot, Jr., Richard E.

Measuring and testing

Dynamometers

Responsive to torque

73862333, 73DIG2, 324209, G01L 302

Patent

active

053219856

ABSTRACT:
A magnetostriction type torque sensor has a magnetostrictive film formed on an outer peripheral surface of a rotary shaft, a coil having a coil centerline extending in a radial direction of the rotary shaft, and a signal processor responsive to coil impedance. Since the coil includes a coil centerline extending in a radial direction of the rotary shaft, magnetic fluxes are formed mainly in a radial direction of the rotary shaft. Accordingly, the magnetic fluxes intruding deep into the rotary shaft are decreased, and the rate of the magnetic fluxes passing through the magnetostrictive film is increased. As a result, the magnetostriction type torque sensor comes to have high sensitivity even when the rotary shaft has high magnetic permeability or high electric conductivity.

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