Fast Technology Ag

Neill Brodey

John Owsley

A magnetoclastic transducer for sensing a torque in a shaft ( ) is formed by circumferentially magnetising a magnetisable, integral portion ( ) of the shaft. To assist in the emanation of a flux-dependent torque, the transducer element portion ( ) of the shaft may have further circumferentially magnetised portions ( ) to each side. These further portions ( ) are of opposite polarity magnetisation to that of the transducer element ( ). The external magnetic flux emanated by the transducer ( ) is a function of torque and is detectable by a magnetic field sensor ( ). An alternative means for the same purpose is to provide the transducer element at a portion ( ) of the shaft ( ) having an integral annular section of raised profile projecting beyond adjoining portions of the shaft. The shaft may be provided with a series of circumferentially magnetised portions of alternating polarity. A number of ways of achieving circumferential magnetisation are described, together with other directions such as axial. A shaft having the whole or an integral portion of it magnetised can also be used to provide a force transducer sensitive to bending moment induced in the shaft by a force to be measured.

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Oxfordshire, United Kingdom

Neill Brodey