GB2205001A - Permanent magnet rotor for a dynamo-electric machine - Google Patents
Permanent magnet rotor for a dynamo-electric machine Download PDFInfo
- Publication number
- GB2205001A GB2205001A GB08710989A GB8710989A GB2205001A GB 2205001 A GB2205001 A GB 2205001A GB 08710989 A GB08710989 A GB 08710989A GB 8710989 A GB8710989 A GB 8710989A GB 2205001 A GB2205001 A GB 2205001A
- Authority
- GB
- United Kingdom
- Prior art keywords
- dynamo
- magnetic material
- electric machine
- outer circumferential
- rotating part
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K1/00—Details of the magnetic circuit
- H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
- H02K1/22—Rotating parts of the magnetic circuit
- H02K1/27—Rotor cores with permanent magnets
- H02K1/2706—Inner rotors
- H02K1/272—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Permanent Field Magnets Of Synchronous Machinery (AREA)
- Iron Core Of Rotating Electric Machines (AREA)
Abstract
A rotating part for a dynamo-electric machine comprises an outer circumferential portion 13 made of permanent magnetic material. The portion 13 includes a magnet portion 14 and outer circumferential recesses 15 filled with reinforced plastics material. A core 11 is made of magnetic material, and the side walls 12 of non-magnetic material. <IMAGE>
Description
Dynamo-Electric Machines
DESCRIPTION:
Technical Field
The invention relates to rotating parts for high speed dynamo-electric machines, that is electric power generators and motors.
Background Art
Rotating parts of dynamo-electric machines cannot be rotated at high speed owing to the low tensile strength of permanent magnetic materials. The tensile stress induced by the centrigual force exceeds the limit permitted for the material.
The Invention
According to the invention, there is provided a rotating part for a dynamo-electric machine which comprises an outer circumferential portion made of permanent magnetic material, the said portion including an outer circumferential recess, and a non-magnetic material in the recess for securing the said portion. The rotating part preferably comprises a core portion made of magnetic material, and side wall portions made of non-magnetic material.
The material for securing the outer circumferential portion may be of high strength, and so make it possible to produce a machine of small size and light weight which is efficient and suitable for high speed operation. For example, a gas turbine can be directly connected to a high speed generator that is without a gear box to decrease the rotational speed of the engine. Thus the power loss in the gear box is avoided. The outer circumferential portion of the permanent magnet is exposed, so that the clearance between the permanent magnet and a stator can be small, making for generating efficiency.
Drawings
Figure 1 is a longitudinal section through a rotating part according to the invention;
Figure 2 is a cross section along II-II in Figure 1; and
Figure 3 is an enlarged view of an outer circumferential portion in Figure 1.
Best Mode
Figures 1 and 2 show a rotating part 10 for a high speed synchronous generator which comprises also a stator (not shown). The part 10 includes a core 11, a side wall 12 and an outer circumferential portion 13. The core 11 is made OL a magnetic material such as a high strength magnetic alloy. The side wall 12 is made of a non-magnetic material such as a high strength non-magnetic alloy or a carbon fibre reinforced plastics material. The outer circumferential portion 13 is provided with a magnet portion 14 and a number of recesses 15.The magnet portion 14 is made of a high magnetic neodymium-iron-boron magnets and the recesses 15 are filled with a light weight high strength non-magnetic material such as a high modulus carbon fibre reinforced plastics material The plastics material may be circumferentially wound. and fixed by an adhesive. The core 11, the side wall 12 and the outer circumferential portion 13 are integrally constructed as a rotor. Permanent magnetic material is exposed at an outer portion 16 of the magnet portion 14.
Upon the high speed rotation of the rotating part 10, the magnet portion 14 is subjected to centrifugal force causing high and possibly damaging tensile stress which may exceed the permitted stress of the material. However, the recesses 15 contain a light weight high strength non-magnetic material and have a suitable shape for supporting the magnetic portion 14. A critical point is shown by a line A-A in Figure 3. A lower part 17 of the magnetic portion 14. is located at an inner radial side of the recesses 15 and supported by the plastics material in the recesses 15. Because the plastics material wound in the recesses 15 resists the centrifugal force, an intermediate part 18 of the magnet portion 14 is supported between the recesses 15. The plastics material bears on the recesses 15 on the line A-A in the intermediate part 18 through the shape of the recesses 15 being smoothly rounded in the inner radial direction; that is having a U-shape as seen in Figure 3.
More than one recess 15 is not always required. The nun;ber depends on the specification.
The outer circumferential portion 13 can be provided as a plurality of layers according to the depth of the recesses 15 which can be decided by the position of the critical point.
If a plurality of layers are provided, the magnet portion 14 of each layer should preferably be axially located at the same position.
Claims (4)
1. A rotating part for a dynamo-electric machine which comprises an outer circumferential portion made of permanent magnetic material, the said portion including an outer circumferential recess, and a non-magnetic material in the recess for securing the said portion.
2. A rotating part according to claim 1, which comprises a core portion made of magnetic material, and side wall portions made of non-magnetic material.
3. A rotating part for a dynamo-electric machine as herein described with reference to the drawings.
4. A dynamo-electric machine having a rotating part accordina to any preceding claim.
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB8710989A GB2205001B (en) | 1987-05-08 | 1987-05-08 | Permanent magnet rotor for a dynamo-electric machine |
| JP63108406A JPS6426349A (en) | 1987-05-08 | 1988-04-30 | High-speed magnetic turning gear |
| US07/190,386 US4893040A (en) | 1987-05-08 | 1988-05-05 | Dynamo-electric machines |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB8710989A GB2205001B (en) | 1987-05-08 | 1987-05-08 | Permanent magnet rotor for a dynamo-electric machine |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| GB8710989D0 GB8710989D0 (en) | 1987-06-10 |
| GB2205001A true GB2205001A (en) | 1988-11-23 |
| GB2205001B GB2205001B (en) | 1991-05-22 |
Family
ID=10617070
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB8710989A Expired - Lifetime GB2205001B (en) | 1987-05-08 | 1987-05-08 | Permanent magnet rotor for a dynamo-electric machine |
Country Status (2)
| Country | Link |
|---|---|
| JP (1) | JPS6426349A (en) |
| GB (1) | GB2205001B (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH1143840A (en) * | 1997-05-27 | 1999-02-16 | Kitamura Seisakusho:Kk | Seamless ink ribbon and its production |
| JP4437185B2 (en) | 1999-05-19 | 2010-03-24 | フジコピアン株式会社 | Multi-layer ink ribbon and manufacturing method thereof |
| JP2013198220A (en) * | 2012-03-16 | 2013-09-30 | Samsung Electromechanics Japan Advanced Technology Co Ltd | Rotary apparatus and production method therefor |
-
1987
- 1987-05-08 GB GB8710989A patent/GB2205001B/en not_active Expired - Lifetime
-
1988
- 1988-04-30 JP JP63108406A patent/JPS6426349A/en active Pending
Also Published As
| Publication number | Publication date |
|---|---|
| GB8710989D0 (en) | 1987-06-10 |
| JPS6426349A (en) | 1989-01-27 |
| GB2205001B (en) | 1991-05-22 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PCNP | Patent ceased through non-payment of renewal fee |
Effective date: 19930508 |