Inner-Rotor Motor and Rotor Thereof
US-2017110918-A1 · Apr 20, 2017 · US
Vacuum pump
US10404118B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-10404118-B2 |
| Application number | US-201615392155-A |
| Country | US |
| Kind code | B2 |
| Filing date | Dec 28, 2016 |
| Priority date | May 31, 2016 |
| Publication date | Sep 3, 2019 |
| Grant date | Sep 3, 2019 |
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- Title
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- Abstract
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Abstract
Official abstract text for this publication.
A vacuum pump for rotary driving a rotor by a motor to perform vacuum pumping, wherein a motor rotor of the motor includes a yoke fixed to a shaft of the rotor, and a permanent magnet held at the yoke, and the yoke includes a holding portion provided apart from the shaft and configured to hold the permanent magnet, and a pair of fitting portions provided respectively at both ends of the holding portion in an axial direction and bonded to the shaft by fitting, and a radial thickness dimension of each fitting portion is set less than that of the holding portion.
First claim
Opening claim text (preview).
What is claimed is: 1. A vacuum pump for rotary driving a rotor by a motor to perform vacuum pumping, wherein a motor rotor of the motor includes a yoke fixed to a shaft of the rotor, and a permanent magnet held at the yoke, and the yoke includes a holding portion provided radially apart from the shaft so as to define a space therebetween in a radial direction, and the holding portion configured to hold the permanent magnet radially outward from the holding portion, and a pair of fitting portions provided respectively at both ends of the holding portion in an axial direction and bonded to the shaft by fitting, and a radial thickness dimension of each fitting portion is set less than that of the holding portion. 2. The vacuum pump according to claim 1 , wherein the fitting between each fitting portion and the shaft is tight-fitting. 3. The vacuum pump according to claim 1 , wherein one of a surface of each fitting portion facing the shaft or a surface of the shaft facing each fitting portion is provided with a raised portion, and the yoke and the shaft are bonded together at the raised portion. 4. The vacuum pump according to claim 1 , wherein an axial width dimension of a bonded region of each fitting portion is set equal to or less than 10% of an axial width dimension of the yoke. 5. The vacuum pump according to claim 1 , wherein the radial thickness dimension of each fitting portion is set equal to or less than 10% of an outer diameter dimension of the yoke.
Assignees
Inventors
Classifications
combined with other supporting means, e.g. hybrid bearings with both magnetic and fluid supporting means · CPC title
Means for mounting or fastening rotating magnetic parts on to, or to, the rotor structures · CPC title
Annular magnets · CPC title
with bearings for axial load combined with bearings for radial load · CPC title
magnetic; electromagnetic · CPC title
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- What does patent US10404118B2 cover?
- A vacuum pump for rotary driving a rotor by a motor to perform vacuum pumping, wherein a motor rotor of the motor includes a yoke fixed to a shaft of the rotor, and a permanent magnet held at the yoke, and the yoke includes a holding portion provided apart from the shaft and configured to hold the permanent magnet, and a pair of fitting portions provided respectively at both ends of the holding…
- Who is the assignee on this patent?
- Shimadzu Corp
- What technology area does this patent fall under?
- Primary CPC classification F04D19/042. Mapped technology areas include Mechanical Engineering.
- When was this patent published?
- Publication date Tue Sep 03 2019 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 1 related publication on this page (citations in our corpus or others sharing the same primary CPC).