Patent ID: 6912923
Filing Date: 2005-07-05
Classification: G01L

Abstract:
1. A device for determining a torque exercised on a shaft, the shaft having a first shaft section and a second shaft section, wherein the first and second shaft sections can rotate relative to each other, the device comprising: a multi-pole magnetic ring, said magnetic ring surrounding and cooperating with the first shaft section; a stator holder mounted to the second shaft section; a first stator element mounted to said stator holder, said first stator element having a first magnetic flux ring and first fingers integral with and projecting from said first magnetic flux ring, said first fingers distributed uniformly over at least part of a periphery of said first magnetic flux ring at mutual separations from each other; a second stator element mounted to said stator holder, said second stator element having a second magnetic flux ring and second fingers integral with and projecting from said second magnet flux ring, said second fingers distributed uniformly over at least part of a periphery of said second magnet flux ring at mutual separations from each other, said second flux ring disposed at a separation from said first flux ring; a magnetic field sensor disposed between said first and said second flux rings; a first magnetic flux concentrator in magnetic communication with said magnetic field sensor, said first magnetic flux concentrator surrounding said first magnetic flux ring; and a second magnetic flux concentrator in magnetic communication with said magnetic field sensor, said second magnetic flux concentrator surrounding said second magnetic flux ring.