Title:
METHOD FOR MAGNETIZING RING MAGNET AND MAGNETIC ENCODER
Document Type and Number:
WIPO Patent Application WO/2006/067878
Kind Code:
A1
Abstract:
An insert member (42) having an identical permeability is fitted in the circular center hole (41a) of a magnetic ring (41) which is then fitted in the circular hollow section (43a) of a fitting-over member (43) having an identical permeability. Under that state, the magnetic ring (41) is placed in a parallel magnetic field. Lines of magnetic flux passing through the magnetic ring (41) held between the insert member (42) and the fitting-over member (43) become linear without substantially inclining against the parallel magnetic field. Under that state, harmonic noise causing deterioration in detection precision will scarcely appear in the output of a magnetic sensor for detecting the rotating magnetic field of a ring magnet (40) obtained by performing two-pole magnetization on the magnetic ring (41). When the ring magnet (40) is employed, deterioration in detection precision of a magnetic encoder (1) due to magnetization state of the ring magnet (40) can be avoided, and deterioration in detection precision can be suppressed.
Inventors:
MIYASHITA KUNIO (JP)
KOYAMA JUNJI (JP)
MITAMURA MUNEO (JP)
SAWAMURA YASUO (JP)
KOYAMA JUNJI (JP)
MITAMURA MUNEO (JP)
SAWAMURA YASUO (JP)
Application Number:
PCT/JP2005/009844
Publication Date:
June 29, 2006
Filing Date:
May 30, 2005
Export Citation:
Assignee:
HARMONIC DRIVE SYSTEMS (JP)
MIYASHITA KUNIO (JP)
KOYAMA JUNJI (JP)
MITAMURA MUNEO (JP)
SAWAMURA YASUO (JP)
MIYASHITA KUNIO (JP)
KOYAMA JUNJI (JP)
MITAMURA MUNEO (JP)
SAWAMURA YASUO (JP)
International Classes:
G01D5/245; H01F13/00
Foreign References:
| JPS5238199A | 1977-03-24 | |||
| JPH03233910A | 1991-10-17 | |||
| JPS56122112A | 1981-09-25 | |||
| JPS63182808A | 1988-07-28 |
Attorney, Agent or Firm:
Yokozawa, Shiro (Shimadachi Matsumoto-sh, Nagano 52, JP)
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