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US 7,116,099 B2Granted
Angular position sensor and rotation control device
AssigneeHitachi, Ltd.
InventorMasashi Saito
Life of this patent
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Abstract
An angular position sensor has a sensor element detects changes of magnetic field strength of a magnet that rotates in synchronization with a rotating body, for detecting its angular position. A circuit is provided for compensating hysteresis characteristics of an output of the sensor element in both the clockwise and counterclockwise rotation directions, using different coefficients for compensation approximated by different functions, depending on whether said rotating body rotates clockwise or counterclockwise.
Claims14
An angular position sensor comprising:
- a sensor element for detecting changes of magnetic field strength of a magnet that rotates in synchronization with a rotating body whose angular position is to be detected;
- and
- compensation means compensating hysteresis characteristics of an output of the sensor element in both a clockwise and a counterclockwise rotation of the rotation body;
- wherein different coefficients, approximated by different functions are used for said compensation, when said rotation body rotates clockwise and counterclockwise.
1 more element
An angular position sensor comprising:
- a motor for driving a rotation body;
- a sensing element for detecting changes of magnetic field strength of a magnet that rotates in synchronization with said rotation body for detecting an angular position of said rotation body;
- control means for controlling said motor so that a rotation angle of said rotation body detected by said sensor element becomes a desired angle;
- and
- compensation means compensating hysteresis characteristics of an output of the sensor element in both a clockwise and a counterclockwise rotation of the rotation body;
- wherein different coefficients, approximated by different functions, are used for said compensation when said body rotates clockwise and counterclockwise.
3 more elements
Dependencies are inferred from the claim text.