Title:
MAGNETIC ENCODER
Document Type and Number:
WIPO Patent Application WO/2002/048652
Kind Code:
A1
Abstract:
A downsized magnetic encoder not requiring a high precision in mounting magnetic field detectors to a magnetizing body. The magnetic encoder which comprises a magnetizing body (2) and magnetic field detectors (5a, 5b, 5c, 5d) disposed in its space (4), and which processes signals output from magnetic field detectors to detect a rotating speed and a rotating position, wherein the magnetizing body (2) consists of a tubular permanent magnet and is magnetized so as to generate uniform, one-direction, parallel magnetic fields (B) in the space (4) in the center in a direction perpendicular to the center axis. A soft magnetic body (10) for forming a magnetic circuit is provided on the outer periphery of this magnetizing body (2), and magnetic field detectors (5a, 5b, 5c, 5d) are disposed in the space (4) with mutual mechanical phase difference of 90 degrees.
Inventors:
ISHIBASHI TOSHIYUKI (JP)
UEMURA KOJI (JP)
MATSUZAKI KAZUNARI (JP)
UEMURA KOJI (JP)
MATSUZAKI KAZUNARI (JP)
Application Number:
PCT/JP2001/010816
Publication Date:
June 20, 2002
Filing Date:
December 10, 2001
Export Citation:
Assignee:
YASKAWA DENKI SEISAKUSHO KK (JP)
ISHIBASHI TOSHIYUKI (JP)
UEMURA KOJI (JP)
MATSUZAKI KAZUNARI (JP)
ISHIBASHI TOSHIYUKI (JP)
UEMURA KOJI (JP)
MATSUZAKI KAZUNARI (JP)
International Classes:
G01D5/244; (IPC1-7): G01D5/18
Foreign References:
| JPH10132506A | 1998-05-22 | |||
| JP2001004315A | 2001-01-12 | |||
| JPH05157506A | 1993-06-22 |
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