The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Dec. 25, 1990
Filed:
Apr. 18, 1990
Robert D Klauber, Fairfield, IA (US);
Erik B Vigmostad, Fairfield, IA (US);
SensorTech L.P., Fairfield, IA (US);
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.