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Patent Searching and Data


Title:
ROTATION ANGLE DETECTION DEVICE AND ROTATION ANGLE DETECTION METHOD
Document Type and Number:
WIPO Patent Application WO/2018/078855
Kind Code:
A1
Abstract:
This rotation angle detection device is provided with a rotor comprising magnetic material, a stator having b (where b is an integer greater than or equal to 3) or more magnetic detection units each comprising a bias magnetic field generation unit and a magnetic detection element, and a rotation angle calculation processing unit for determining the rotation angle of the rotor from detection signals obtained from the magnetic detection elements. The surface of the rotor opposing the stator has a recessed and protruding part that varies by x (where x is an integer greater than or equal to 1) periods within a mechanical angle of 360 degrees. The recessed and protruding part has a shape that varies in a curved manner so that sine waves are obtained from the magnetic detection elements. b magnetic detection units of the stator are provided along the circumferential direction in one period of the recessed and protruding part so as to oppose the rotor and so as to be disposed at intervals of mechanical angles of 360 × (n × b + m) / (x × b) degrees, where n is an integer greater than or equal to 0 expressing, in numbers of the period, the deviation in the peripheral direction from a magnetic detection unit reference position and m is an integer from 1 to b expressing the arrangement order among the b magnetic detection units.

Inventors:
ISODA HITOSHI (JP)
MIYAMA YOSHIHIRO (JP)
NISHIMURA TATSUO (JP)
ARITA HIDEAKI (JP)
NISHIMURA SHINJI (JP)
NISHIZAWA KOJI (JP)
Application Number:
PCT/JP2016/082268
Publication Date:
May 03, 2018
Filing Date:
October 31, 2016
Export Citation:
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Assignee:
MITSUBISHI ELECTRIC CORP (JP)
International Classes:
G01D5/245
Domestic Patent References:
WO2011104961A12011-09-01
Foreign References:
JP2006329888A2006-12-07
JP2013061346A2013-04-04
JP2008209340A2008-09-11
JP2004069655A2004-03-04
JP2003050270A2003-02-21
JP2000046581A2000-02-18
Attorney, Agent or Firm:
SOGA, Michiharu et al. (JP)
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