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:
Oct. 17, 1989
Filed:
Sep. 19, 1988
Jarl Sobel, Vaster.ANG.s, SE;
Asea Brown Boveri AB, Vaster.ANG.s, SE;
Abstract
A magnetoelastic torque transducer comprises a shaft, three stationary coils connected in series to magnetize the shaft and three coils to sense moment transmitted in the shaft, and a magnetic casing surrounding the coils. The shaft has three parallel annular zones provided with such anisotropy that the magnetic field in the shaft is deflected by an angle .alpha. relative to a generatrix to the shaft in the outer zones and is deflected by an angle .alpha. to a generatrix to the shaft in the middle zone, the axial extension of both outer zones being substantially half that of the intermediate zone. The angle .alpha. should be at least 45.degree. in order to obtain good sensitivity in the transducer. The excitation coils are arranged concentrically to the shaft, each being located outside an annular zone and the outer excitation coils being wound with substantially half as many turns as the central excitation coil. Concentric with each excitation coil is a measuring coil, the outer measuring coils being wound with substantially half as many turns as the central measuring coil and this being arranged to be inverse-connected to the outer measuring coils.