US4887059A
Expired / Lapsed
US
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Iron core of electromagnet and method of producing the same
Assignee: Hitachi Ltd
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Filing: 1987-07-02
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Granted: 1989-12-12
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Expires: 2007-07-02
Abstract
Abstract The iron core of an electromagnet includes a stack of steel sheets stacked perpendicular to a horizontal axis, presents a sectional shape symmetrical with respect to the horizontal axis and is provided therein with a groove of a specified shape. The iron core is produced by stacking and integrating a desired number of steel sheets into a one-piece iron core and finally forming the specific shaped groove therein. Accordingly, no gaps are generated in the iron core and the density thereof becomes high even in the case of a sector iron core. Furthermore, the groove formation is conducted as a final step after the integration of the stacked steel sheets. Thus the heat during the welding operation for such an integration has no adverse effect on the groove in the iron core and the problem of lack of magnetic force is solved thereby.
Inventors
- 👤 Katsuhiko Asano
- 👤 Hiroshi Hashimoto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 05:32
CPC Classifications
B; B82; B82Y; B82Y15/00; H; H01; H01F; H01F41/00; H01F41/02; H01F41/0206; H01F41/0233; H01F3/00; H01F3/02
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
89 words
An iron core comprising: a stack of a plurality of steel sheets providing a sectional shape symmetrical with respect to a horizontal axis, said steel sheets being stacked perpendicular to said horizontal axis to form a one-piece iron core; and a groove of a specified shape provided within said iron core; wherein said iron core has a substantially C-shaped section and a sector plane view, and side and end plates are attached to peripheral surfaces of said iron core, through which said steel sheets are welded and fixed together.
Claim 2
Dependent Claim
89 words
An iron core comprising: a stack of a plurality of steel sheets providing a sectional shape symmetrical with respect to a horizontal axis, said steel sheets being stacked perpendicular to said horizontal axis to form a one-piece iron core; and a groove of a specified shape provided within said iron core; wherein said iron core has a substantially C-shaped section and a sector plane view, and side and end plates are attached to peripheral surfaces of said iron core, through which said steel sheets are welded and fixed together.
Claim 3
Dependent Claim
90 words
An iron core comprising: a stack of a plurality of steel sheets providing a sectional shape symmetrical with respect to a horizontal axis, said steel sheets being stacked perpendicular to said horizontal axis to form a one-piece iron core; and a groove of a specified shape provided within said iron core; wherein said groove presents an H-shape and said iron core has a sector plane view, and side and end plates are attached to peripheral surfaces of said iron core, through which said steel sheets are welded and fixed together.
Claim 4
Dependent Claim
90 words
An iron core comprising: a stack of a plurality of steel sheets providing a sectional shape symmetrical with respect to a horizontal axis, said steel sheets being stacked perpendicular to said horizontal axis to form a one-piece iron core; and a groove of a specified shape provided within said iron core; wherein said groove presents an H-shape and said iron core has a sector plane view, and side and end plates are attached to peripheral surfaces of said iron core, through which said steel sheets are welded and fixed together.
Claim 5
Dependent Claim
89 words
An iron core comprising: a stack of a plurality of steel sheets providing a sectional shape symmetrical with respect to a horizontal axis, said steel sheets being stacked perpendicular to said horizontal axis to form a one-piece iron core; and a groove of a specified shape provided within said iron core; wherein said iron core has a substantially C-shaped section and a rectangular plane view, and side and end plates are attached to peripheral surfaces of said iron core, through which said steel sheets are welded and fixed together.
Claim 6
Dependent Claim
89 words
An iron core comprising: a stack of a plurality of steel sheets providing a sectional shape symmetrical with respect to a horizontal axis, said steel sheets being stacked perpendicular to said horizontal axis to form a one-piece iron core; and a groove of a specified shape provided within said iron core; wherein said iron core has a substantially C-shaped section and a rectangular plane view, and side and end plates are attached to peripheral surfaces of said iron core, through which said steel sheets are welded and fixed together.
Claim 7
Dependent Claim
90 words
An iron core comprising: a stack of a plurality of steel sheets providing a sectional shape symmetrical with respect to a horizontal axis, said steel sheets being stacked perpendicular to said horizontal axis to form a one-piece iron core; and a groove of a specified shape provided within said iron core; wherein said groove presents an H-shape and said iron core has a rectangular plane view, and side and end plates are attached to peripheral surfaces of said iron core, through which said steel sheets are welded and fixed together.
Claim 8
Dependent Claim
90 words
An iron core comprising: a stack of a plurality of steel sheets providing a sectional shape symmetrical with respect to a horizontal axis, said steel sheets being stacked perpendicular to said horizontal axis to form a one-piece iron core; and a groove of a specified shape provided within said iron core; wherein said groove presents an H-shape and said iron core has a rectangular plane view, and side and end plates are attached to peripheral surfaces of said iron core, through which said steel sheets are welded and fixed together.
Claim 9
Independent Claim
102 words
A method of producing an iron core of an electromagnetic comprising the steps of: stacking a desired number of steel sheets; fixing said steel sheets together into a one-piece iron core; and finally forming a groove of a specific shape within said iron core wherein said steel sheets are stacked perpendicular to a horizontal axis into an iron core half and machining a groove half on said iron core half, and wherein said method further comprises the steps of preparing two said iron core halves and fixing said iron core halves together into a one-piece iron core to form the groove therebetween.
Claim 10
Independent Claim
102 words
A method of producing an iron core of an electromagnetic comprising the steps of: stacking a desired number of steel sheets; fixing said steel sheets together into a one-piece iron core; and finally forming a groove of a specific shape within said iron core wherein said steel sheets are stacked perpendicular to a horizontal axis into an iron core half and machining a groove half on said iron core half, and wherein said method further comprises the steps of preparing two said iron core halves and fixing said iron core halves together into a one-piece iron core to form the groove therebetween.
Claim 11
Dependent Claim
56 words
A method according to claim 5, wherein said steel sheets are stacked into said iron core half of a rectangular plane view, and said method further comprises the step of matching said iron core half is not a sector plane view one having curved peripheries and opposite ends extending towards a centre axis of the sector.
Claim 12
Dependent Claim
44 words
A method according to claim 6, wherein said method further comprises the steps of applying side and end plates onto peripheral surfaces of said sector plane view iron core half and welding said steel sheets with each other through said side and end plates.
Claim 13
Dependent Claim
82 words
An iron core of an electromagnet comprising: a stack of a plurality of steel sheets providing a sectional shape symmetrical with respect to a horizontal axis, said steel sheets being stacked along said horizontal axis such that each of said steel sheets extends in a direction perpendicular to said horizontal axis; and a groove of a specific shape provided within said steel sheets and extending in a direction perpendicular to a stack direction, said stack direction being parallel to said horizontal axis.
Claim 14
Dependent Claim
82 words
An iron core of an electromagnet comprising: a stack of a plurality of steel sheets providing a sectional shape symmetrical with respect to a horizontal axis, said steel sheets being stacked along said horizontal axis such that each of said steel sheets extends in a direction perpendicular to said horizontal axis; and a groove of a specific shape provided within said steel sheets and extending in a direction perpendicular to a stack direction, said stack direction being parallel to said horizontal axis.
Claim 15
Independent Claim
83 words
A method of producing an iron core of an electromagnet comprising the steps of: stacking a desired number of steel sheets along a horizontal axis such that each of said steel sheets extends in a direction perpendicular to said horizontal axis; fixing said steel sheets together into a one-piece iron core; and finally machining said iron core in a direction perpendicular to a stack direction to form a groove of a specific shape therein, said stack direction being parallel to said horizontal direction.
Claim 16
Independent Claim
83 words
A method of producing an iron core of an electromagnet comprising the steps of: stacking a desired number of steel sheets along a horizontal axis such that each of said steel sheets extends in a direction perpendicular to said horizontal axis; fixing said steel sheets together into a one-piece iron core; and finally machining said iron core in a direction perpendicular to a stack direction to form a groove of a specific shape therein, said stack direction being parallel to said horizontal direction.
Claim 17
Dependent Claim
30 words
A method according to claim 9, wherein said steel sheets are stacked along a horizontal axis such that each of said steel sheets are perpendicularly positioned to said horizontal axis.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-12-11 | 1993-06-12 | 1993-12-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-12-11 | 1997-06-12 | 1997-12-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-12-11 | 2001-06-12 | 2001-12-12 | $7700.00 | Window Closed / Lapsed |