Condition monitoring
US-2019310163-A1 · Oct 10, 2019 · US
Rotation speed detector
US12216138B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-12216138-B2 |
| Application number | US-202218707180-A |
| Country | US |
| Kind code | B2 |
| Filing date | May 16, 2022 |
| Priority date | May 16, 2022 |
| Publication date | Feb 4, 2025 |
| Grant date | Feb 4, 2025 |
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- Title
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- Abstract
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- First independent claim
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Abstract
Official abstract text for this publication.
A rotation speed detector includes: a base material to be attached to a rotating body; a first magnetic pole having an arcuate strip shape and provided on the base material; a second magnetic pole having an arcuate strip shape and provided on the base material; and a power generation element including a magnetic wire configured to cause a large Barkhausen effect, and a pickup coil. The power generation element is arranged to face the first magnetic pole and the second magnetic pole so that a longitudinal direction of the magnetic wire is provided along a radial direction of the first magnetic pole and the second magnetic pole. A non-magnetic gap is provided between the first magnetic pole and the second magnetic pole.
First claim
Opening claim text (preview).
The invention claimed is: 1. A rotation speed detector comprising: a non-magnetic base material to be attached to a rotating body; a first magnetic pole having an arcuate strip shape and provided on the base material such that an outer peripheral side serves as an N pole and an inner peripheral side serves as an S pole; a second magnetic pole having an arcuate strip shape and provided on the base material such that an outer peripheral side serves as the S pole and an inner peripheral side serves as the N pole; and a power generation element including, a magnetic wire configured to cause a large Barkhausen effect, and a pickup coil configured to detect magnetization reversal of the magnetic wire, wherein the power generation element is arranged to face the first magnetic pole and the second magnetic pole so that a longitudinal direction of the magnetic wire is provided along a radial direction of the first magnetic pole and the second magnetic pole, and a non-magnetic gap is provided between the first magnetic pole and the second magnetic pole, wherein each of the first magnetic pole and the second magnetic pole includes a plurality of bar magnets, and an installation interval of the plurality of bar magnets included in the first magnetic pole and the second magnetic pole is equal to or less than a half of a half bandwidth, wherein the half bandwidth is a dimension in a direction parallel to a surface of the base material on which the first magnetic pole and the second magnetic pole are provided and orthogonal to a longitudinal direction of the bar magnet and is a dimension of a range in which a magnetic field generated by the bar magnet is equal to or more than a half of a peak. 2. The rotation speed detector according to claim 1 , wherein the gap is larger than a vibration width in a rotation direction generated in the rotating body.
Assignees
Inventors
Classifications
delivered by rotating magnets · CPC title
- G01P3/4815Primary
using a pulse wire sensor, e.g. Wiegand wire · CPC title
of pulse signals · CPC title
- G01P3/44Primary
for measuring angular speed (G01P3/56 takes precedence) · CPC title
using a variable number of pulses in a train · CPC title
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Frequently asked questions
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- What does patent US12216138B2 cover?
- A rotation speed detector includes: a base material to be attached to a rotating body; a first magnetic pole having an arcuate strip shape and provided on the base material; a second magnetic pole having an arcuate strip shape and provided on the base material; and a power generation element including a magnetic wire configured to cause a large Barkhausen effect, and a pickup coil. The power ge…
- Who is the assignee on this patent?
- Mitsubishi Electric Corp
- What technology area does this patent fall under?
- Primary CPC classification G01P3/4815. Mapped technology areas include Physics.
- When was this patent published?
- Publication date Tue Feb 04 2025 00:00:00 GMT+0000 (Coordinated Universal Time) (B2). Legal status and post-grant events are not shown on this page.
- What related patents are in patentsdb?
- We list 3 related publications on this page (citations in our corpus or others sharing the same primary CPC).