Title:
ROTATION SPEED DETECTOR
Document Type and Number:
WIPO Patent Application WO/2020/250439
Kind Code:
A1
Abstract:
A rotation speed detector (1) has: a magnet (2) attached to a shaft (4), which is a rotating body that rotates about a rotation axis (9); and a power generation element (3) that generates an inducement voltage in accordance with a change in a magnetic field produced due to rotation of the magnet (2). The rotation speed detector (1) detects the rotation speed of the rotating body on the basis of the inducement voltage. The power generation element (3) has: a magnetic wire (6); a coil (7) wound between a first end part and a second end part of the magnetic wire (6), these end parts being the two end parts of the magnetic wire (6); and cylindrical ferrite beads (8) that are provided to each of the first end part and the second end part, the ferrite beads (8) being soft magnetic bodies. The magnet (2) has a plurality of magnetic poles arranged in the rotation direction of the magnet (2). Each of the plurality of magnetic poles has a first region and a second region having mutually different strengths of magnetic force.
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Inventors:
TORII HISANORI (JP)
MUSHA TAKESHI (JP)
NOGUCHI TAKUYA (JP)
OKUMA MASASHI (JP)
MUSHA TAKESHI (JP)
NOGUCHI TAKUYA (JP)
OKUMA MASASHI (JP)
Application Number:
PCT/JP2019/023729
Publication Date:
December 17, 2020
Filing Date:
June 14, 2019
Export Citation:
Assignee:
MITSUBISHI ELECTRIC CORP (JP)
International Classes:
G01D5/245
Domestic Patent References:
| WO2013094042A1 | 2013-06-27 |
Foreign References:
| JPS5576533U | 1980-05-27 | |||
| JP2005114609A | 2005-04-28 | |||
| JP2000101401A | 2000-04-07 | |||
| JPS5419134A | 1979-02-13 | |||
| JP2013217792A | 2013-10-24 | |||
| US20150130450A1 | 2015-05-14 |
Attorney, Agent or Firm:
TAKAMURA, Jun (JP)
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