Multipole magnet for use with a pitched magnetic sensor
AssigneePhoenix America, Inc.
InventorJohn Kaste
Life of this patent
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Abstract
A position encoder comprising a cylindrical rotor; first and second magnetic poles having opposite polarity helically disposed about the inner or outer diameter of the rotor; first and second Hall sensors disposed within a distance suitable for the Hall sensors to detect the magnet poles.
Claims26
A magnetic position encoder system, said encoder system comprising:
- a rotor, said rotor having a central axis about which said rotor is operably rotatable and surfaces that define a generally cylindrical shape;
- an elongate first magnetic pole extending continuously in its respective longitudinal directions about the central axis, said first magnetic pole helically disposed on a surface of said rotor, said first magnetic pole having a first magnetic polarity, said elongate first magnetic pole extending continuously in its respective longitudinal directions at least 360° about the central axis;
- an elongate second magnetic pole extending continuously in its respective longitudinal directions about the central axis, said second magnetic pole helically disposed on said surface of said rotor and adjacently to said first magnetic pole, said second magnetic pole having a second magnetic polarity that is opposite to said first magnetic polarity, said elongate second magnetic pole extending continuously in its respective longitudinal directions at least 360° about the central axis;
- a first Hall sensor, said first Hall sensor disposed within a distance suitable for said first Hall sensor to detect said first and said second magnetic poles;
- and
- a second Hall sensor, disposed within a distance suitable for said second Hall sensor to detect said first and said second magnetic poles, said second Hall sensor disposed relative to said first Hall sensor such that the output of said first Hall sensor is 90° out of phase from said second Hall sensor.
A rotor for use with a sensor in a magnetic position encoder system,
- wherein said rotor comprises a cylindrical magnet having a circumferential surface and a central axis, said rotor is operably rotatable about said central axis, and said circumferential surface is disposed about said central axis;
- and
- wherein said magnet comprises at least two elongate magnetic poles of opposite polarity that are laterally adjacent to each other, each said magnetic pole extending continuously in its respective longitudinal directions helically about said central axis on a surface of the cylindrical magnet, each said elongate magnetic pole extending continuously in its respective longitudinal directions at least 360° about said central axis.
A rotor for use with a sensor in a magnetic position encoder system, said rotor comprising a cylinder having a central axis, and at least two elongate magnetic poles of opposite polarity that are laterally adjacent to each other and extend continuously in their respective longitudinal directions in a helical magnetic pole pattern on a surface of the cylinder, each said magnetic pole extending in directions along the central axis, each said magnetic pole extending circumferentially at a substantially constant radial distance about the central axis, each said elongate magnetic pole extending continuously in its respective longitudinal directions at least 360° about the central axis.
A rotor for use with a sensor in a magnetic position encoder system, said rotor defining a cylinder having a central axis and comprising at least two elongate magnetic poles of opposite polarity that are laterally adjacent to each other, each said magnetic pole extending continuously in its respective longitudinal directions helically about said central axis on an axial end surface of the cylinder.
A magnetic position encoder system, said encoder system comprising:
- a rotor, said rotor having an axis of rotation and surfaces that define a generally cylindrical shape;
- an elongate first magnetic pole extending continuously in its respective longitudinal directions about said axis of rotation, said first magnetic pole helically disposed on a surface of said rotor, said first magnetic pole having a first magnetic polarity, said elongate first magnetic pole extending continuously in its respective longitudinal directions at least 360° about said axis of rotation;
- an elongate second magnetic pole extending continuously in its respective longitudinal directions about said axis of rotation, said second magnetic pole helically disposed on said surface of said rotor and adjacently to said first magnetic pole, said second magnetic pole having a second magnetic polarity that is opposite to said first magnetic polarity, said elongate second magnetic pole extending continuously in its respective longitudinal directions at least 360° about said axis of rotation;
- and
- a first magnetic sensor, said first magnetic sensor disposed within a distance suitable for said first magnetic sensor to detect said first and said second magnetic poles.
Dependencies are inferred from the claim text.