| US 7,595,635 B2 | ||
| Small size magnetic encoder unit with low power consumption | ||
| Koji Uemura, Fukuoka (Japan); Yuji Arinaga, Fukuoka (Japan); and Takefumi Kabashima, Fukuoka (Japan) | ||
| Assigned to Kabushiki Kaisha Yaskawa Denki, Fukuoka (Japan) | ||
| Appl. No. 11/629,302 PCT Filed May 11, 2005, PCT No. PCT/JP2005/008598 § 371(c)(1), (2), (4) Date May 23, 2007, PCT Pub. No. WO2005/124285, PCT Pub. Date Dec. 29, 2005. |
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| Claims priority of application No. 2004-178124 (JP), filed on Jun. 16, 2004. | ||
| Prior Publication US 2008/0054886 A1, Mar. 06, 2008 | ||
| Int. Cl. G01B 7/30 (2006.01) | ||
| U.S. Cl. 324—207.25 [324/207.2; 324/207.21] | 6 Claims |
| 1. A magnetic encoder unit comprising:
a permanent magnet magnetized in a direction perpendicular to a rotation axis of a rotating member and fixed to the rotating
member,
a magnetic field detecting element fixed to a fixed member so as to be opposite to the permanent magnet with a gap therebetween,
and
a signal processing circuit processing a signal from the magnetic field detecting element, wherein
the magnetic field detecting element includes at least two one-turn magnetic field detecting elements detecting an angle in
not more than one-turn and at least two multi-turn magnetic field detecting elements detecting an amount of multi-turn, and
the signal processing circuit includes a one-turn signal processing circuit generating a not more than one-turn angle signal
from detection signals from the one-turn magnetic field detecting elements and a multi-turn signal processing circuit generating
a multi-turn signal from detection signals of the multi-turn magnetic field detecting elements.
|