Measuring and testing – Dynamometers – Responsive to torque
Patent
1990-04-18
1990-12-25
Ruehl, Charles A.
Measuring and testing
Dynamometers
Responsive to torque
G01L 310
Patent
active
049793993
ABSTRACT:
A noncontacting method for sensing torque based on the principle of magnetostriction comprises inducing a primary magnetic flux in a shaft (20) via such means as a primary excitation core/coil (30/32), utilizing a secondary core/coil (34/36), and an auxiliary core/coil (48/50), and dividing a secondary signal obtained from the secondary core/coil (34/36) by a signal obtained from the auxiliary core/coil (48/50) to obtain a torque dependent signal. Signal dependence on RPM, temperature, inhomogeneity of shaft permeability magnitude, and air gap is thereby minimized. Another embodiment employs a plurality of sensors (66A/66B) strategically located around the shaft (20) to eliminate spurious signals which are due to bending stress and shaft misalignment.
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Klauber Robert D.
Vigmostad Erik B.
Ruehl Charles A.
Sensortech L.P.
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