Measuring and testing – Dynamometers – Responsive to torque
Patent
1994-03-24
1995-11-14
Chilcot, Richard
Measuring and testing
Dynamometers
Responsive to torque
73862333, 73862336, G01L 302
Patent
active
054656273
ABSTRACT:
A torque sensor comprises a magnetoelastically active element, and a magnetic sensor, such as a Hall effect sensor, responsive to the field of the magnetoelastically active portion. In the preferred embodiment, the magnetoelastically active portion comprises a ring of material endowed with an effective uniaxial magnetic anisotropy such that the circumferential direction is the easy axis, and magnetically polarized in a substantially circumferential direction. The ring is attached to the torqued member, such as a rotating shaft, so that application of a torque to the shaft is transmitted to the ring. The torque on the ring reorients the circumferential magnetic orientation of the ring, producing a helical magnetic orientation having both circumferential and axial components. A magnetic field vector sensor is mounted on a flux collector in a fixed position relative to the ring and oriented so that it responds only to axial magnetic field components of the ring. The output of the sensor is thus proportional to the change in orientation of the magnetization resulting from torque applied to the shaft and transmitted to the ring.
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Chilcot Richard
Dougherty Elizabeth L.
Magnetoelastic Devices, Inc.
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