Patent · US Expired

Position and speed sensors for a rotating shaft

US6163147A · kind A · utility

10Cited by
2References
22Claims
0Family size

Assignee

Inventor

Key dates

Filing dateDec 30, 1998
Grant dateDec 19, 2000
Priority date—
Expiry dateDec 30, 2018

Classification

  • Technology area (CPC G)Physics
  • CPC primaryG01D5/145
  • WIPO fieldMeasurement
  • WIPO sectorInstruments

Abstract

A fixed sensor has two sensing elements delivering sinusoidal signals .GAMMA., and is mounted in front of the magnetized face of an annular multipolar encoder. The axis (.delta..sub.C) of the sensor (5) having the centers of the two sensing elements (51 and 52) is located at a distance (R.sub.0) from the axis (.delta..sub.R) of rotation of the encoder (4), and the encoder (4) has on its magnetized face (6) 2 m magnetic transitions between poles of opposite polarities, north and south, in the form of spirals, whose tracing is obtained by successive rotations by angles .pi./m of the first transition around the center (0) of the encoder, defined in polar coordinates (.mu., .theta.) by the equations: ##EQU1##

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.