GB717485A - Improvements in or relating to electrical machines comprising permanent magnets - Google Patents
Improvements in or relating to electrical machines comprising permanent magnetsInfo
- Publication number
- GB717485A GB717485A GB32615/52A GB3261552A GB717485A GB 717485 A GB717485 A GB 717485A GB 32615/52 A GB32615/52 A GB 32615/52A GB 3261552 A GB3261552 A GB 3261552A GB 717485 A GB717485 A GB 717485A
- Authority
- GB
- United Kingdom
- Prior art keywords
- pole
- shoes
- disc
- magnetized
- highly permeable
- 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.)
- Expired
Links
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K21/00—Synchronous motors having permanent magnets; Synchronous generators having permanent magnets
- H02K21/12—Synchronous motors having permanent magnets; Synchronous generators having permanent magnets with stationary armatures and rotating magnets
- H02K21/24—Synchronous motors having permanent magnets; Synchronous generators having permanent magnets with stationary armatures and rotating magnets with magnets axially facing the armatures, e.g. hub-type cycle dynamos
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
- B62J—CYCLE SADDLES OR SEATS; AUXILIARY DEVICES OR ACCESSORIES SPECIALLY ADAPTED TO CYCLES AND NOT OTHERWISE PROVIDED FOR, e.g. ARTICLE CARRIERS OR CYCLE PROTECTORS
- B62J6/00—Arrangement of optical signalling or lighting devices on cycles; Mounting or supporting thereof; Circuits therefor
- B62J6/06—Arrangement of lighting dynamos or drives therefor
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F1/00—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties
- H01F1/01—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials
- H01F1/03—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity
- H01F1/0302—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity characterised by unspecified or heterogeneous hardness or specially adapted for magnetic hardness transitions
- H01F1/0311—Compounds
- H01F1/0313—Oxidic compounds
- H01F1/0315—Ferrites
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F7/00—Magnets
- H01F7/02—Permanent magnets [PM]
- H01F7/0205—Magnetic circuits with PM in general
- H01F7/021—Construction of PM
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Permanent Field Magnets Of Synchronous Machinery (AREA)
Abstract
717,485. Magnetic structures; dynamoelectric machines. PHILIPS ELECTRICAL INDUSTRIES, Ltd. Dec. 23, 1952 [Dec. 29, 1951], No. 32615/52. Classes 35 and 38(2) An electric machine, such as a motor or generator, comprising a coaxial rotor and stator arranged side by side, embodies in one member material of high coercivity in the form of segments 1, 2 of a disc permanently magnetized in the axial direction, and in the other member pole-shoes 3, 4 and 10, 11 of highly permeable material facing but axially displaced from pole surfaces of the magnetized disc. The thickness of the pole-shoes increases towards windings 8, 12 which are borne between them on parts 9 of reduced cross-section. The permanent magnetic material is such that it is not easily demagnetized, e.g. it may consist of non-cubic crystals of polyoxides Fe and at least one of the metals Ba, Sr, Pb and if desired Ca, such as form the subject of Specification 708,127, and all the magnetic material may have high resistivity e.g. greater than 10<SP>5</SP> ohm-cm, so that the machines are suitable for high frequency operation. In a modification, two pole-shoe structures embraced by one winding may be between two permanent magnetic discs whose outer faces bear highly permeable discs to provide a return path for the flux, Fig. 2 (not shown). The permanent magnet disc may be magnetized in all four quadrants, Fig. 3 (not shown), and there may be four segmental pole-shoes associated with four coils, Fig. 4 (not shown). The pole-shoes may be the faces of spirally wound core 31 carrying windings 27-30 on parts of the core of reduced cross-section, the core becoming thinner to the lines 33 equidistant from adjacent coils, Fig. 5. The pole faces of one polarity on the permanently magnetized disc may be of highly permeable material affixed thereto, Fig. 6 (not shown).
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| NL717485X | 1951-12-29 | ||
| NL949415X | 1951-12-29 | ||
| NL311376X | 1951-12-29 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB717485A true GB717485A (en) | 1954-10-27 |
Family
ID=27351282
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB32615/52A Expired GB717485A (en) | 1951-12-29 | 1952-12-23 | Improvements in or relating to electrical machines comprising permanent magnets |
Country Status (2)
| Country | Link |
|---|---|
| GB (1) | GB717485A (en) |
| NL (1) | NL84047C (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108352240A (en) * | 2015-10-20 | 2018-07-31 | 移动磁体技术公司 | Linear actuators with improved magnetic stability and breakaway force |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS63241905A (en) * | 1987-03-27 | 1988-10-07 | Sumitomo Special Metals Co Ltd | Magnetic field generating equipment |
-
0
- NL NL84047D patent/NL84047C/xx active
-
1952
- 1952-12-23 GB GB32615/52A patent/GB717485A/en not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108352240A (en) * | 2015-10-20 | 2018-07-31 | 移动磁体技术公司 | Linear actuators with improved magnetic stability and breakaway force |
Also Published As
| Publication number | Publication date |
|---|---|
| NL84047C (en) |
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