Apparatus for measuring torque applied to a shaft

Details Apparatus for measuring torque applied to a shaft Apparatus for measuring torque applied to a shaft

1988-08-04

1990-02-13

Ruehl, Charles A.

Measuring and testing

Dynamometers

Responsive to torque

73DIG2, G01L 310

Patent

active

048995983

ABSTRACT:
An apparatus is provided for sensing torque applied to a shaft. In the field on contactless torque sensing, magnetic flux is induced into magnetostrictive material on a shaft whose torque is to be measured. The magnetic permeability of the magnetostrictive material changes in response to torque. The change in magnetic permeability alters the magnetic flux in the magnetostrictive material, and can be sensed by non-contacting inductive coils in close proximity to the magnetostrictive material. However, the amount of flux penetration into the shaft effects the sensed magnetic flux, and thus effects the accuracy of the torque measurement. As a solution, a magnetostrictive material sheet is bonded to a nonferromagnetic sheet which is bonded to a shaft. The nonferromagnetic sheet limits the amount of flux penetration into the shaft to produce better torque measurements.

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