Magnetic encoder for sensing position and direction via a time and space modulated magnetic field
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United States of America Patent
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Aug 17, 1999
Grant Date -
N/A
app pub date -
Jun 2, 1997
filing date -
Jul 23, 1996
priority date (Note) -
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Abstract
A magnetic encoder is disclosed that provides a uniform magnetic field which is time modulated at a carrier frequency and space modulated by a repetitive pattern of eddy-current conducting lands that move with variable motion. The time modulation is provided by driving an electrical coil in a resonant tank circuit. The space modulation provides areas of higher and lower magnetic field intensity which change in correspondence with the motion of the conducting lands. The intensity of the varying magnetic field is detected by a series connected pair of stationary coils that are positioned orthogonal to both the direction of the changing magnetic field and the direction of the motion of the conducting lands. The pair of stationary coils yield a differential electrical signal that is representative of the motion of the conducting lands.
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