Title:
ROTATION ANGLE MEASURING APPARATUS
Document Type and Number:
Japanese Patent JP2014178309
Kind Code:
A
Abstract:
PROBLEM TO BE SOLVED: To provide a rotation angle measuring apparatus using a magnetic convergence plate, which can prevent accuracy deterioration due to magnetic saturation of the magnetic convergence plate.SOLUTION: The rotation angle measuring apparatus comprises: a first Hall element pair 21 detecting a magnetic component in a first direction; a second Hall element pair 22 detecting a magnetic component in a second direction different from the first direction; a third Hall element pair 23 detecting a magnetic component in a third direction different from the first direction and the second direction; and a fourth Hall element pair 24 detecting a magnetic component in a fourth direction different from the first to third directions. The rotation angle measuring apparatus further comprises: an angle calculation section 27 that calculates a first rotational angle θ of a rotary magnet based on output signal intensities of the first Hall element pair 21 and the second Hall element pair 22, and calculates a second rotational angle θc of the rotary magnet based on output signal intensities of the third Hall element pair 23 and the fourth Hall element pair 24; and a rotational angle information correction section 29 that corrects rotational angle information from the first rotational angle θ and the second rotational angle θc.
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Inventors:
NAKAMURA TAKENOBU
OKATAKE SHIGEKI
OKATAKE SHIGEKI
Application Number:
JP2014011348A
Publication Date:
September 25, 2014
Filing Date:
January 24, 2014
Export Citation:
Assignee:
ASAHI KASEI DENSHI KK
International Classes:
G01D5/14; G01D5/245
Domestic Patent References:
| JP2005315696A | 2005-11-10 | |||
| JP2002071381A | 2002-03-08 |
Attorney, Agent or Firm:
Woods Tetsuya
Tanaka 秀てつ
Tanaka 秀てつ