Direct-read meter capable of eliminating magnetic interference of adjacent rotating wheels
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United States of America Patent
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Oct 6, 2020
Grant Date -
Mar 15, 2018
app pub date -
Jan 11, 2016
filing date -
Jan 14, 2015
priority date (Note) -
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Abstract
A direct-read meter capable of eliminating magnetic interference of adjacent rotating wheels, comprising N coaxial rotating wheel permanent magnets and corresponding magnetic angle sensors, a sampling element, a storage element, and a computation element. The magnetic angle sensors sense a linear superposition of the magnetic field from the intended permanent magnet rotating wheel and the interfering magnetic fields from the other rotating wheel permanent magnets. The sampling element samples the output signals of the N magnetic angle sensors to form a N*1 raw signal matrix [V/Vp]k(i)raw. The storage element stores an N*N correction matrix [Cij]; and the computation element computes the correction signal matrix [V/Vp]kcorr(i)=[V/Vp]k(i)raw−sum{C(i, j)*[V/Vp]k(j)raw}, thus eliminating the interfering magnetic field and permitting calculation of the rotation angle of the rotating wheel permanent magnets. This direct-read meter has the advantages of simple calculation, high precision, and elimination of the need for magnetic shielding.
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