| US 7,586,283 B2 | ||
| Magnetic encoder device and actuator | ||
| Takefumi Kabashima, Fukuoka (Japan); Ryuichiro Tominaga, Fukuoka (Japan); Kazutoshi Imai, Fukuoka (Japan); Yuji Arinaga, Fukuoka (Japan); Motomichi Ohto, Fukuoka (Japan); and Hirotoshi Hayakawa, Saitama (Japan) | ||
| Assigned to Kabushiki Kaisha Yaskawa Denki, Fukuoka (Japan) | ||
| Appl. No. 10/576,532 PCT Filed Oct. 21, 2004, PCT No. PCT/JP2004/015592 § 371(c)(1), (2), (4) Date Jan. 24, 2007, PCT Pub. No. WO2005/040729, PCT Pub. Date May 06, 2005. |
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| Claims priority of application No. P. 2003-364321 (JP), filed on Oct. 24, 2003. | ||
| Prior Publication US 2007/0164733 A1, Jul. 19, 2007 | ||
| Int. Cl. G05B 19/29 (2006.01) | ||
| U.S. Cl. 318—603 [318/602] | 15 Claims |
| 1. A magnetic encoder device comprising:
a magnetic encoder including a permanent magnet fixed to a rotating body and a magnetic field detecting element which faces
the permanent magnet through an air gap and is fixed to a fixed body, and
a signal processing circuit which processes a signal from the magnetic field detecting element, wherein
the rotating body has a ring shape,
the permanent magnet has a ring shape, is inscribed in and fixed to an inner circumferential side of the rotating body and
magnetized in parallel to a direction perpendicular to a center axis of the rotating body,
the fixed body has a circular outer circumference and a cavity and is disposed at an inner circumferential side of the permanent
magnet through the air gap, and
the magnetic field detecting element is disposed on an outer circumferential side of the fixed body through the permanent
magnet and the air gap.
|