Back to results
US 6,910,391 B1Granted
Magnetized torque transducer elements
AssigneeFast Technology AG
InventorLutz Axel May
Life of this patent
Estimating the term…
Loading patent…
Loading patent…
AssigneeFast Technology AG
InventorLutz Axel May
Estimating the term…
The problem of magnetoelastic cirumferentially-magnetized torque transducers having a zero output magnetic field at zero torque is solved by pre-torqueing. This entails is circumferentially magnetizing the transducer element at a predetermined torque. The technique is advantageously applied to a pair of transducer elements (32, 34: 62, 64) whose outputs are combined (FIG. 6a: 76) to provide a range of measurement of torque (clockwise and counterclockwise) including zero torque. Various combinations of direction of pre-torque and direction of circumferential-magnetization are discussed. A circuit (FIG. 8) is disclosed for combining the signals to obtain a reference level (84) for gain control of the combined output signals V o from the two transducer elements (60, 62). Also disclosed is the application of the invention to other forms of torque transducer element in which a magnetic field is stored. One form is longitudinal magnetization (FIG. 10a). Another is radially spaced magnetization (FIG. 12a: FIG. 13).
A transducer element of a magnetic material for a torque or force sensor which comprises:
A transducer element of a magnetic material for a force or a torque sensor wherein the element has an axis about which a torque is applicable or about which a bending moment is impressible due to an applied force, the transducer element comprising:
A method of forming a transducer element for the measurement of torque or force comprising:
A method of forming a transducer element for the measurement of torque or force comprising:
Dependencies are inferred from the claim text.