FR2444327A1 - Electromagnet with core of varying cross section - has non-magnetic complementary sleeve portions to provide solid varying air gap - Google Patents
Electromagnet with core of varying cross section - has non-magnetic complementary sleeve portions to provide solid varying air gapInfo
- Publication number
- FR2444327A1 FR2444327A1 FR7835734A FR7835734A FR2444327A1 FR 2444327 A1 FR2444327 A1 FR 2444327A1 FR 7835734 A FR7835734 A FR 7835734A FR 7835734 A FR7835734 A FR 7835734A FR 2444327 A1 FR2444327 A1 FR 2444327A1
- Authority
- FR
- France
- Prior art keywords
- core
- electromagnet
- air gap
- varying
- frusto
- 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
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F7/00—Magnets
- H01F7/06—Electromagnets; Actuators including electromagnets
- H01F7/08—Electromagnets; Actuators including electromagnets with armatures
- H01F7/13—Electromagnets; Actuators including electromagnets with armatures characterised by pulling-force characteristics
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F7/00—Magnets
- H01F7/06—Electromagnets; Actuators including electromagnets
- H01F7/08—Electromagnets; Actuators including electromagnets with armatures
- H01F7/16—Rectilinearly-movable armatures
- H01F7/1607—Armatures entering the winding
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F7/00—Magnets
- H01F7/06—Electromagnets; Actuators including electromagnets
- H01F7/08—Electromagnets; Actuators including electromagnets with armatures
- H01F7/16—Rectilinearly-movable armatures
- H01F7/1653—Magnetic circuit having axially spaced pole-pieces
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F7/00—Magnets
- H01F7/06—Electromagnets; Actuators including electromagnets
- H01F7/08—Electromagnets; Actuators including electromagnets with armatures
- H01F7/081—Magnetic constructions
- H01F2007/085—Yoke or polar piece between coil bobbin and armature having a gap, e.g. filled with nonmagnetic material
Landscapes
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Electromagnets (AREA)
Abstract
The electromagnet has a tubular armature (10) which by end plates (12a, 12b) with central holes (12e) through which a core (15) is slidable. The armature (10) contains an annular coil (13) with terminals (14a, 14b) projecting through one end plate (12b). The core (15) is cylindrical with two enlarged frusto-conical end portions (15a, 15b) tapering in the same direction. The core, armature (10) and end plates are all at high permeability low remanence magnetic material such as iron, steel, cobalt or nickel. The frusto-conical portions (15a, 15b) are rendered cylindrical by surrounding non-magetic sleeves (16a, 16b) of e.g. electrolytic copper or plastics such as polyester to provide a variable air gap. The core is biassed by surrounding spring (17) and has a central cylindrical portion equal in length to the core stroke. Various shaped core end portions may be used in place of the frusto-conical portions (15a, 15b).
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR7835734A FR2444327A1 (en) | 1978-12-15 | 1978-12-15 | Electromagnet with core of varying cross section - has non-magnetic complementary sleeve portions to provide solid varying air gap |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR7835734A FR2444327A1 (en) | 1978-12-15 | 1978-12-15 | Electromagnet with core of varying cross section - has non-magnetic complementary sleeve portions to provide solid varying air gap |
Publications (2)
Publication Number | Publication Date |
---|---|
FR2444327A1 true FR2444327A1 (en) | 1980-07-11 |
FR2444327B1 FR2444327B1 (en) | 1981-07-24 |
Family
ID=9216321
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
FR7835734A Granted FR2444327A1 (en) | 1978-12-15 | 1978-12-15 | Electromagnet with core of varying cross section - has non-magnetic complementary sleeve portions to provide solid varying air gap |
Country Status (1)
Country | Link |
---|---|
FR (1) | FR2444327A1 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2471657A1 (en) * | 1979-12-01 | 1981-06-19 | Lucas Industries Ltd | ELECTROMAGNETIC ACTUATION DEVICE |
Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR364953A (en) * | 1906-03-12 | 1906-08-31 | John William Holman | electromagnets |
US2448727A (en) * | 1944-03-27 | 1948-09-07 | Warner Electric Brake Mfg Co | Solenoid with armature |
FR1200464A (en) * | 1958-06-24 | 1959-12-22 | alternating current electromagnet, especially for solenoid valves | |
FR1294701A (en) * | 1956-03-20 | 1962-06-01 | Improvement in electromagnets | |
DE1165751B (en) * | 1959-07-15 | 1964-03-19 | Siemens Schuckertwerke Gmbh | Plunger armature electromagnet with wavy tensile force curve |
US3588769A (en) * | 1969-11-18 | 1971-06-28 | Westinghouse Electric Corp | Armature for electromagnetic device |
DE2433775A1 (en) * | 1973-07-17 | 1975-05-28 | Elektro App Werke Veb | High power electromagnet of defined force and displacement character - uses variable pole areas for magnetic force dependent on stroke and pole area |
-
1978
- 1978-12-15 FR FR7835734A patent/FR2444327A1/en active Granted
Patent Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR364953A (en) * | 1906-03-12 | 1906-08-31 | John William Holman | electromagnets |
US2448727A (en) * | 1944-03-27 | 1948-09-07 | Warner Electric Brake Mfg Co | Solenoid with armature |
FR1294701A (en) * | 1956-03-20 | 1962-06-01 | Improvement in electromagnets | |
FR1200464A (en) * | 1958-06-24 | 1959-12-22 | alternating current electromagnet, especially for solenoid valves | |
DE1165751B (en) * | 1959-07-15 | 1964-03-19 | Siemens Schuckertwerke Gmbh | Plunger armature electromagnet with wavy tensile force curve |
US3588769A (en) * | 1969-11-18 | 1971-06-28 | Westinghouse Electric Corp | Armature for electromagnetic device |
DE2433775A1 (en) * | 1973-07-17 | 1975-05-28 | Elektro App Werke Veb | High power electromagnet of defined force and displacement character - uses variable pole areas for magnetic force dependent on stroke and pole area |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2471657A1 (en) * | 1979-12-01 | 1981-06-19 | Lucas Industries Ltd | ELECTROMAGNETIC ACTUATION DEVICE |
Also Published As
Publication number | Publication date |
---|---|
FR2444327B1 (en) | 1981-07-24 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
ST | Notification of lapse |