GB1342728A - - Google Patents
Info
- Publication number
- GB1342728A GB1342728A GB1342728DA GB1342728A GB 1342728 A GB1342728 A GB 1342728A GB 1342728D A GB1342728D A GB 1342728DA GB 1342728 A GB1342728 A GB 1342728A
- Authority
- GB
- United Kingdom
- Prior art keywords
- magnets
- leading
- trailing
- polepiece
- magnet
- 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
- H02K23/00—DC commutator motors or generators having mechanical commutator; Universal AC/DC commutator motors
- H02K23/02—DC commutator motors or generators having mechanical commutator; Universal AC/DC commutator motors characterised by arrangement for exciting
- H02K23/04—DC commutator motors or generators having mechanical commutator; Universal AC/DC commutator motors characterised by arrangement for exciting having permanent magnet excitation
-
- 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
- H02K1/12—Stationary parts of the magnetic circuit
- H02K1/17—Stator cores with permanent magnets
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Permanent Field Magnets Of Synchronous Machinery (AREA)
- Dc Machiner (AREA)
Abstract
1342728 Dynamo-electric machines JOSEPH LUCAS (INDUSTRIES) Ltd 23 April 1971 [20 Feb 1970] 8170/70 Heading H2A The effect of armature reaction in a dynamoelectric machine having at least two opposed, permanently magnetized stator polepieces interacting with a rotor winding supplied through a commutator is reduced by connecting the leading and trailing portions of the rear face of each polepiece to separate yoke members, the magnetic path between which has a high reluctance. In the machine shown in Fig. 2, each polepiece comprises two circumferentially spaced magnets 18, the leading magnets of the two polepieces being interconnected by one yoke member, the trailing magnets by another yoke member. A circumferentially magnetized permanent magnet 20, Fig. 4 (not shown), may be disposed between the two magnets of each polepiece. The latter two magnets may be of the same material. Alternatively, in the case of a motor, the trailing magnets may be of a material having a high coercivity, the leading magnets of a material having a high remanence. In a modification, Fig. 5, each polepiece comprises a single ferrite magnet 32, the leading and trailing portions of each magnet being connected respectively to the trailing and leading portions of the other magnet through yoke members 31, the two yoke members being separated by a space.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB817070 | 1971-04-23 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1342728A true GB1342728A (en) | 1974-01-03 |
Family
ID=9847155
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB1342728D Expired GB1342728A (en) | 1971-04-23 | 1971-04-23 |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB1342728A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3025498A1 (en) * | 1980-07-04 | 1982-01-21 | Siemens AG, 1000 Berlin und 8000 München | Stator for permanent magnet electrical machine - uses additional magnets between stator pole magnets to prevent stray flux |
| GB2136216A (en) * | 1982-12-21 | 1984-09-12 | Kollmorgen Tech Corp | Stator assembly for dc motor |
| EP0360546A2 (en) * | 1988-09-21 | 1990-03-28 | LUCAS INDUSTRIES public limited company | Permanent magnet field electric motor |
| GB2246913B (en) * | 1990-07-23 | 1994-09-21 | Mabuchi Motor Co | A balanced rotor in a miniature motor |
| EP2325976A1 (en) | 2009-11-20 | 2011-05-25 | Robert Bosch GmbH | Electric motor, in particular actuator or drive motor in motor vehicles |
-
1971
- 1971-04-23 GB GB1342728D patent/GB1342728A/en not_active Expired
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3025498A1 (en) * | 1980-07-04 | 1982-01-21 | Siemens AG, 1000 Berlin und 8000 München | Stator for permanent magnet electrical machine - uses additional magnets between stator pole magnets to prevent stray flux |
| GB2136216A (en) * | 1982-12-21 | 1984-09-12 | Kollmorgen Tech Corp | Stator assembly for dc motor |
| EP0360546A2 (en) * | 1988-09-21 | 1990-03-28 | LUCAS INDUSTRIES public limited company | Permanent magnet field electric motor |
| EP0360546A3 (en) * | 1988-09-21 | 1990-12-27 | LUCAS INDUSTRIES public limited company | Permanent magnet field electric motor |
| GB2246913B (en) * | 1990-07-23 | 1994-09-21 | Mabuchi Motor Co | A balanced rotor in a miniature motor |
| EP2325976A1 (en) | 2009-11-20 | 2011-05-25 | Robert Bosch GmbH | Electric motor, in particular actuator or drive motor in motor vehicles |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PS | Patent sealed | ||
| PCNP | Patent ceased through non-payment of renewal fee |