ROTATION ANGLE MEASUREMENT DEVICE AND ROTATION MACHINE EMPLOYING SAME

WIPO Patent Application WO/2014/054507

A1

Provided is a rotation angle measurement device whereby it is possible to reduce a decline in precision in measurement of a rotation angle owing to temperature changes and/or elapsed time, and whereby it is possible to reduce a degradation in measurement precision of the rotation angle owing to attachment error in an installation location of a magnetic field angle measurement-type magnetic sensor. A first yoke and a second yoke, which are configured of magnetic bodies comprising yoke protrusions in at least one of the yokes, are disposed upon a rotatable rotation body. A magnetic flux supply body, which is capable of supplying a magnetic flux, is installed in an outer lateral face of the rotating body, and a magnetic field angle measurement-type magnetic sensor, which outputs a signal corresponding to a magnetic field angle, is installed in an outer lateral face of the yoke protrusions. Thus, even in a site which is not Z=0mm (a reference point), the effect which broad magnetic force lines radiating from a magnet have on a magnetic field angle measurement-type magnetic sensor is alleviated, and it is possible to reduce degradation in rotation angle measurement precision owing to attachment error in an installation location of the magnetic sensor.

SUZUKI MUTSUMI (JP)
MATSUMURA TAKAFUMI (JP)
ONOZUKA JUNJI (JP)

PCT/JP2013/076182

April 10, 2014

September 27, 2013

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HITACHI AUTOMOTIVE SYSTEMS LTD (JP)

G01D5/245; B62D5/04; G01B7/30; G01L3/10

JP2003315092A	2003-11-06
JP2007187481A	2007-07-26
JPH0254174A	1990-02-23
JPS646763A	1989-01-11
US4602515A	1986-07-29

INOUE Manabu et al. (JP)
Manabu Inoue (JP)

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