Motor
US-2016020653-A1 · Jan 21, 2016 · US
Surface groove patterns for permanent magnet machine rotors
US9985484B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-9985484-B2 |
| Application number | US-201514734580-A |
| Country | US |
| Kind code | B2 |
| Filing date | Jun 9, 2015 |
| Priority date | Jun 9, 2015 |
| Publication date | May 29, 2018 |
| Grant date | May 29, 2018 |
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- Title
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- Abstract
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Abstract
Official abstract text for this publication.
A permanent magnet electric machine includes a rotor configured to rotate about an axis. The rotor is comprised of axially stacked sections. Each section is comprised of axially stacked laminations that define a pattern of axial grooves on an outer surface of the rotor to reduce torque ripple. The pattern is different for at least two of the sections. The pattern for each section may alternate with respect to poles of the rotor.
First claim
Opening claim text (preview).
What is claimed is: 1. A permanent magnet machine comprising: a rotor comprising a plurality of poles arranged about an axis, each of the poles corresponding to a predetermined arc length of a circumferential surface of the rotor formed by a plurality of axially stacked laminations that define a plurality of axial grooves on the circumferential surface of the rotor for each of the poles such that a spacing between the grooves is different for each of the poles. 2. The permanent magnet machine of claim 1 wherein the plurality of axial grooves for each of the poles is two axial grooves. 3. The permanent magnet machine of claim 2 wherein the plurality of axial grooves for each of the poles is defined by an angle between the axial grooves of each of the poles and the angle is different for each of the poles.
Assignees
Inventors
Classifications
Magnetic cores, or permanent magnets characterised by their skew · CPC title
with a magnetic circuit specially adapted for avoiding torque ripples or self-starting problems · CPC title
- H02K21/14Primary
with magnets rotating within the armatures · CPC title
Details · CPC title
- H02K1/2766Primary
having a flux concentration effect · CPC title
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Frequently asked questions
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- What does patent US9985484B2 cover?
- A permanent magnet electric machine includes a rotor configured to rotate about an axis. The rotor is comprised of axially stacked sections. Each section is comprised of axially stacked laminations that define a pattern of axial grooves on an outer surface of the rotor to reduce torque ripple. The pattern is different for at least two of the sections. The pattern for each section may alternate …
- Who is the assignee on this patent?
- Ford Global Tech Llc
- What technology area does this patent fall under?
- Primary CPC classification H02K21/14. Mapped technology areas include Electricity.
- When was this patent published?
- Publication date Tue May 29 2018 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).