Magnetoelastic torque transducer for improved torque measurement
First Claim
1. A torque transducer comprising a transducer shaft arranged with a cylinder-shaped magnetoelastic region at the cylindrical periphery of the transducer shaft, which cylinder-shaped magnetoelastic region is permanently magnetized in the azimuthal direction and surrounded by at least one winding which is fed by an alternating current, which winding in turn surrounds a cylinder-shaped layer in the form of a shell consisting of a highly permeable and non-linear ferromagnetic material for generating even harmonics, characterized in that a layer of said highly permeable and non-linear ferromagnetic material arranged in physical contact with the cylinder-shaped magnetoelastic region.
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Abstract
A torque transducer for measuring torque transmitted in a rotating as well as a stationary shaft. The torque transducer comprises a transducer shaft 1 arranged with a cylinder-shaped magnetoelastic region 2 fixed to the cylindrical periphery of the transducer shaft, which cylinder-shaped magnetoelastic region is permanently magnetized in the azimuthal direction. The transducer shaft with the cylinder-shaped magnetoelastic region is surrounded by a winding 4 which is supplied by an alternating current. Further, the winding is connected to a phase-sensitive detector 5. According to the present invention, a magnetic and non-linear ferromagnetic material 3′ is arranged in physical contact with the cylinder-shaped magnetoelastic region 2. The advantages are that the transducer shaft is manufactured independently of the magnetic properties of the shaft material and may substantially consist of a ferromagnetic material.
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Citations
16 Claims
- 1. A torque transducer comprising a transducer shaft arranged with a cylinder-shaped magnetoelastic region at the cylindrical periphery of the transducer shaft, which cylinder-shaped magnetoelastic region is permanently magnetized in the azimuthal direction and surrounded by at least one winding which is fed by an alternating current, which winding in turn surrounds a cylinder-shaped layer in the form of a shell consisting of a highly permeable and non-linear ferromagnetic material for generating even harmonics, characterized in that a layer of said highly permeable and non-linear ferromagnetic material arranged in physical contact with the cylinder-shaped magnetoelastic region.
Specification