Crowell & Moring LLP
Non-contact position sensor
A non-contact position sensor having improved rotational angle measuring accuracy is provided.A magnet is attached To a rotating shaft. An angle sensor element detects magnetic field changes generated from the magnet due to rotation of the rotating shaft. A signal processor, on the basis of a temperature detected by a temperature sensor, corrects variance between the sensors including the sensor element, the signal processor, and the magnet by correcting an amplitude value and/or an offset value of a signal or variance due to time of the amplitude value. The sensor element 1 outputs the first and second outputs v1 and v2 and the signal processor obtains the temperature coefficients of the amplitude values of the output v1 and output v2, or the temperature coefficients of the offset values, or the coefficients of variance due to time of the amplitude values, obtains the ratio of the first and second outputs corrected by these coefficients, and calculates the angle using the corrected ratio.
Hitachi, Ltd.
G G G G G G
G01D G01D G01D G01D G01D G01D
inventional inventional inventional inventional inventional inventional
Masashi
Saito