GB2256537A - A method of assembling pre-wound coils on a laminated stator - Google Patents
A method of assembling pre-wound coils on a laminated stator Download PDFInfo
- Publication number
- GB2256537A GB2256537A GB9112111A GB9112111A GB2256537A GB 2256537 A GB2256537 A GB 2256537A GB 9112111 A GB9112111 A GB 9112111A GB 9112111 A GB9112111 A GB 9112111A GB 2256537 A GB2256537 A GB 2256537A
- Authority
- GB
- United Kingdom
- Prior art keywords
- pieces
- layers
- neck portions
- bundles
- neck
- 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.)
- Withdrawn
Links
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K15/00—Methods or apparatus specially adapted for manufacturing, assembling, maintaining or repairing of dynamo-electric machines
- H02K15/06—Embedding prefabricated windings in machines
- H02K15/062—Windings in slots; salient pole windings
- H02K15/065—Windings consisting of complete sections, e.g. coils, waves
- H02K15/066—Windings consisting of complete sections, e.g. coils, waves inserted perpendicularly to the axis of the slots or inter-polar channels
-
- 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
- H02K1/14—Stator cores with salient poles
- H02K1/146—Stator cores with salient poles consisting of a generally annular yoke with salient poles
- H02K1/148—Sectional cores
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K3/00—Details of windings
- H02K3/04—Windings characterised by the conductor shape, form or construction, e.g. with bar conductors
- H02K3/18—Windings for salient poles
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Iron Core Of Rotating Electric Machines (AREA)
Abstract
Pre-wound coils (7) are fitted over pole pieces formed from two first stacks (15) of primary laminations (2). The two stacks 15 are then drawn apart to seat the coils (7) against the neck portions (9 and 10) of the primary laminations (2). Second and third stacks (16 and 17) of outer and inner pieces (12 and 13) of the secondary laminations (3) are then inserted between the first stacks (15) to complete the laminated stack. Locking means, not shown, hold the second and third stacks (16 and 17) in place. An insulating layer may be provided between the winding and the laminations. <IMAGE>
Description
An Internally Wound Laminated Core for an Electric Machine
Field of the Invention
The invention relates to an internally wound laminated core for an electric machine in which a sleeve-shaped laminated core is wound with coils which surround pole pieces formed in the internal surface of the core. In practice, a wound core such as this is normally the wound core of a stator in which coils surround the internal pole pieces of a laminated stator core.
Background Art
In a conventional wound stator, for an electric machine, a laminated stator core has a stack of layers of ferromagnetic sheet material shaped to provide at least two equiangularly-spaced pole pieces which each have a neck and a head of greater circumferential extent than the neck; a plurality of coils respectively surround the necks of the pole pieces; and each layer of ferromagnetic sheet material comprises an annular portion, at least two equiangularly-spaced neck portions extending radially inwards from the annular portion to form the necks, and head portions, of greater circumferential extent than the neck portions, respectively disposed radially inwards of the neck portions to form the heads.
This form of construction is convenient in that all the stator core laminations are identical. However, the coils have to be wound around the pole pieces and a lot of space is lost, in the axial direction of the wound stator, because of the winding head. Although it is cheaper and faster to pre-wind the coil, outside the stator, the coil has to be large enough to enter the slots on opposite sides of the head of each pole piece and therefore does not fit closely around the neck of pole piece.
Disclosure of the Invention
It is the purpose of invention to provide a wound stator, for an electric motor, in which the disadvantages of the known methods of construction are at least partly overcome.
This is achieved by providing a wound stator in which the layers of ferromagnetic sheet material comprise primary and secondary layers; each secondary layer is a composite lamination, spaced inwardly from the ends of the laminated stator; the neck portions of each composite lamination have respective outer parts connected to the annular portion and respective inner parts, respectively connected to the head portions of the composite lamination; the inner parts of the neck portions and the respectively connected head portions of each composite lamination constitute integrally formed separate pieces which are movable radially inwards; the annular portion of each composite lamination together with the connected outer parts of the neck portions constitute at least two separate pieces which are movable radially outwards; and releasable locking means are provided for preventing radial movement of the separate pieces.
Thus, according to the invention, there is provided a wound stator, for an electric machine, in which a laminated stator core has a stack of primary and secondary layers of ferromagnetic sheet material shaped to provide at least two equiangularly-spaced pole pieces which each have a neck and a head of greater circumferential extent than the neck; a plurality of coils respectively surround the necks of the pole pieces; each layer of ferromagnetic sheet material comprises an annular portion, at least two equiangularly-spaced neck portions extending radially inwards from the annular portion to form the necks, and head portions, of greater circumferential extent than the neck portions, respectively disposed radially inwards of the neck portions to form the heads; each secondary layer is a composite lamination, spaced inwardly from the ends of the laminated stator; the neck portions of each composite lamination have respective outer parts connected to the annular portion and respective inner parts, respectively connected to the head portions of the composite lamination; the annular portion of each composite lamination together with the connected outer parts of the neck portions constitute at least two separate pieces which are movable radially outwards; the inner parts of the neck portions and the respectively connected head portions of each composite lamination constitute integrally formed separate pieces which are movable radially inwards; and releasable locking means are provided for preventing radial movement of the separate pieces.
The invention also provides a method of producing a wound rotor for an electric machine including the steps of forming a plurality of primary and secondary layers of ferromagnetic sheet material which each has an annular portion, at least two equiangularly-spaced neck portions extending radially inwards from the annular portion, and head portions, of greater circumferential extent than the neck portions, respectively disposed radially inwards of the neck portions; stacking the layers of ferromagnetic sheet material to form a laminated stator core which has at least two equiangularly-spaced pole pieces having necks formed by the neck portions and heads, of greater circumferential extent than the necks, formed by the head portions; providing a field coil around the neck of each pole piece; forming each secondary layer as a composite lamination positioned inwardly from the ends of the laminated stator core; forming the annular portion of each composite lamination together with the connected outer parts of the neck portions in at least two separate outer pieces which are movable radially outwards; forming the inner parts of the neck portions and the respectively connected head portions of each composite lamination integrally as separate inner pieces which are movable radially inwards; pre-winding the field coils; stacking the primary layers of ferromagnetic sheet material to form a sub-stack; placing the pre-wound coils around the neck portions of the primary layers of the sub-stack; completing the laminated stator core by mounting the composite laminations inwardly from the end of the laminated stator by moving the separate outer pieces of the composite laminations radially inwards and by moving the separate inner pieces of the composite laminations radially outwards; and providing locking means for preventing radial movement of the separate pieces.
Two wound stators embodying the invention are hereinafter described, by way of example, with reference to the accompanying drawings.
Brief Description of the Drawings
Figure 1 is a schematic isometric view of a first wound stator according to the invention;
Figures 2 and 3 are plan views of primary and secondary layers of ferromagnetic sheet material from which the stator core of the wound stator shown in Figure 1 are made;
Figure 4 is an exploded view of the secondary layer shown in Figure 3;
Figure 5 is a schematic exploded view of the stator core of the wound rotor shown in Figure 1;
Figure 6, 7 and 8 are schematic diagrams illustrating the assembly of the stator core of the wound stator shown in
Figure 1; and
Figure 9 is a sketch illustrating a second wound stator embodying the invention.
Best Modes for Carrying out of the Invention
As shown in Figure 1, a wound stator according to the invention comprises a laminated stator core 1 comprising a stack of layers of ferromagnetic sheet material shaped to provide three equiangularly-spaced pole pieces which each have a neck 4 and 5 and a head 6, of greater circumferential extent than the neck 4 and 5. Field coils 7 (only two of which are shown) respectively surround the three necks 4 and 5 of the pole pieces of the stator core 1.
The primary and secondary layers 2 and 3, which are stacked together to form the laminated stator core 1, each has an annular portion 8, three equiangularly-spaced neck portions 9 and 10 extending radially inwards from the annular portion 8 and a head portion 11, of greater circumferential extent than the neck portions 9 and 10.
In the stacked stator core 1, the neck portions 9 and 10 form the necks 4 and 5 of the stator core 1 and head portions 11 of the layers 2 and 3 form the heads 16 of the stator core 1.
As shown in Figure 2, each primary lamination consists of a one-piece lamination whereas, as shown in Figures 3 and 4, each secondary layer comprises a six piece composite lamination. Thus, the neck portions 9 and 10 of each composite lamination have respective outer parts 9 respectively connected to the annular portion 8 and respective inner parts 10 respectively connected to the head portions 11 of the composite lamination 3.The annular portion 8 of each composite lamination 3 together with the connected outer part 9 of the neck portions 9 and 10 constitute three separate pieces 12 which are movable radially outwards from their assembled positions and the inner part 10 of the neck portions 9 and 10 and the respectively connected head portions 11 of each composite lamination 3 constitute three integrally formed separate pieces 13 which are movable radially inwards from their assembled positions.
Locking means 14 are provided for preventing radial removal of the outer and inner pieces 12 and 13.
As shown in Figure 6, two first bundles 15 of primary laminations 2 are mounted side by side to form a sub-stack 21. A pre-wound coil 7 (shown schematically) is placed around the neck portions 9 and 10. The two first bundles 15 are then drawn a part as shown in Figure 7, causing the coil 7 to seat against the opposite sides of the neck portions 9 and 10. Second and third bundles 16 and 17, respectively formed of the outer and inner pieces 12 and 13 of the secondary layers 3 are then inserted between the two first bundles 15 and locked in position by the locking means 14 to complete the formation of the laminate stator core 1.
As shown in Figure 9, additional insulation may be provided between the coil 7 and each pole piece. As shown, two strips 18 of insulating material are respectively mounted on opposite sides of each pole piece 4, 5 and 6 and two pieces 19 of insulating material are respectively folded around opposite end 20 of each pole piece 4, 5 and 6 so that, at each end 20 of each pole piece 4, 5 and 6, one of the pieces 19 of insulating material overlaps the strips 18 of insulating material mounted on opposite side of the pole piece 4, 5 and 6.
Figure 9 corresponds to Figure 7 in that it shows the pole piece 4, 5 and 6 before the insertion of second and third bundles 16 and 17 of outer and inner pieces 12 and 13. It also shows how the strips 18, which have the same length as the two first bundles 15 forming the sub-stack 21, become spaced from the ends 20 of the pole piece 4, 5 and 6 but remain overlapped by the pieces 19 of insulating material folded around opposite ends 20 of the pole piece 4, 5 and 6.
The scope of the invention is set out in the appended claims. Although these claims include reference numerals, this is solely for ease of understanding and these reference numerals are not to be regarded as limiting the scope of the claims. The reference numerals should therefore be disregarded in interpreting the scope of the claims.
Claims (7)
1. An internally wound laminated core, for an electric machine, in which:
a sleeve-shaped laminated core (1) has a stack of layers (2 and 3) of ferromagnetic sheet material shaped to provide at least two equiangularly-spaced pole pieces (4, 5 and 6) which are formed in an internal surface of the core (1) and each have a neck (4 and 5) and a head (6) of greater circumferential extent than the neck (4 and 5);
a plurality of coils (7) respectively surrounds the necks (4 and 5) of the pole pieces (4 to 6); and
each layer (2 and 3) of ferromagnetic sheet material comprises an annular portion (8), at least two equiangularly-spaced neck portions (9 and 10) extending radially inwards from the annular portion (8) to form the necks (4 and 5), and head portions (11), of greater circumferential extent than the neck portions (9 and 10), respectively disposed radially inwards of the neck portions (9 and 10) to form the heads (6);
characterised in that::
the layers (2 and 3) of ferromagnetic sheet material comprise primary and secondary layers;
each secondary layer (3) is a composite lamination, spaced inwardly from the ends of the laminated stator core (1);
the neck portions (9 and 10) of each composite lamination (3) have respective outer parts (9), respectively connected to the annular portion (8), and respective inner parts (10) connected to the head portions (11) of the composite lamination (3);
the annular portion (8) of each composite lamination (3) together with the connected outer parts (9) of the neck portions (9 and 10) constitute at least two separate outer pieces (12) which are movable radially inwards;;
the inner parts (10) of the neck portions (9 and 10) and the respectively connected head portions (11) of each composite lamination (3) constitute integrally formed separate inner pieces (13) which are movable radially outwards; and
locking means (14) are provided for preventing radial movement of the separate pieces.
2. An internally wound core according to Claim 1 in which:
the stack of layers (2 and 3) of ferromagnetic sheet material comprises at least two spaced first bundles (15) of primary layers (2) and a plurality of secondary layers (3) is disposed between the two first bundles (15) of primary layers (2).
3. An internally wound core according to Claim 2 in which the secondary layers (3) disposed between the two bundles (15) of primary layers (2) comprise at least two second bundles (16) of the outer pieces (12) and at least two third bundles (17) of the inner pieces (13).
4. An internally wound core according to Claim 1 or
Claim 2 in which two strips (18) of insulating material are respectively mounted on opposite sides of each pole piece (4, 5 and 6), and two pieces (19) of insulating material are respectively folded around opposite ends (20) of each pole piece (4, 5 and 6) so that, at each end (20) of each pole piece (4, 5 and 6), one of the pieces (19) of insulating material overlaps the strips (18) of insulating material mounted on opposite sides of the pole piece (4, 5 and 6).
5. An internally wound core according to Claim 1 in which the composite laminations are disposed just under the insulation of each end of the stack, in case this insulation is made by adjusted moulded part.
6. A method of producing an internally wound laminated core for an electric machine including the steps of:
forming a plurality of layers (2 and 3) of ferromagnetic sheet material which each has an annular portion (8), at least two equiangularly-spaced neck portions (9 and 10) extending radially inwards from the annular portion (8), and head portions (11), of greater circumferential extent than the neck portions (9 and 10), respectively disposed radially inwards of the neck portions (9 and 10);
stacking the layers (2 and 3) of ferromagnetic sheet material to form a sleeve-shaped laminated core (1) which has at least two equiangularly-spaced pole pieces (4, 5 and 6) having necks (4 and 5) formed by the neck portions (9 and 10) and heads (6), of greater circumferential extent than the necks (4 and 5), formed by the head portions (11); and
providing a field coil (7) around the neck (4 and 5) of each pole piece (4, 5 and 6);
characteristic by:
forming the layers (2 and 3) of ferromagnetic sheet material as primary and secondary layers;
forming each secondary layer (3) as a composite lamination positioned inwardly from the ends of the laminated core (1);
forming the annular portion (8) of each composite lamination (3) together with the connected outer parts (9) of the neck portions (9 and 10) in at least two separate outer pieces (12) which are movable radially outwards;
forming the inner parts (10) of the neck portions (9 and 10) and the respectively connected head portions (11) of each composite lamination (3) integrally as separate inner pieces (13) which are movable radially inwards;
pre-winding the field coils (7);
stacking the primary layers (2) of ferromagnetic sheet material to form a sub-stack (21);;
placing the pre-wound coils (7) around the neck portions (9 and 10) of the primary layers (2) of the substack (21);
completing the laminated stator core (1) by mounting the composite laminations (3) inwardly from the end of the laminated stator by moving the separate outer pieces (12) of the composite laminations (3) radially inwards and by moving the separate inner pieces (13) of the composite laminations (3) radially outwards; and
providing locking means (14) for preventing radial movement of the separate pieces (12 and 13).
7. A method of according Claim 4 including the steps of:
dividing the sub-stack (21) of primary layers (2) of ferromagnetic sheet material into at least two first bundles (15), after the pre-wound coils (7) have been placed around the neck portions (9 and 10) of the primary layers (2) of the sub-stack (21);
forming second bundles (16) and third bundles (17) respectively of outer and inner pieces (12 and 13);
completing the laminated core (1) by placing the second and third bundles (16 and 17) between each pair of adjacent first bundles (15).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB9112111A GB2256537A (en) | 1991-06-05 | 1991-06-05 | A method of assembling pre-wound coils on a laminated stator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB9112111A GB2256537A (en) | 1991-06-05 | 1991-06-05 | A method of assembling pre-wound coils on a laminated stator |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| GB9112111D0 GB9112111D0 (en) | 1991-07-24 |
| GB2256537A true GB2256537A (en) | 1992-12-09 |
Family
ID=10696149
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB9112111A Withdrawn GB2256537A (en) | 1991-06-05 | 1991-06-05 | A method of assembling pre-wound coils on a laminated stator |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB2256537A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1322022A1 (en) * | 2001-12-23 | 2003-06-25 | Grundfos A/S | Stator with a modular construction |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1586509A (en) * | 1976-12-07 | 1981-03-18 | Paris & Du Rhone | Multi-coil field magnets for electric motors |
-
1991
- 1991-06-05 GB GB9112111A patent/GB2256537A/en not_active Withdrawn
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1586509A (en) * | 1976-12-07 | 1981-03-18 | Paris & Du Rhone | Multi-coil field magnets for electric motors |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1322022A1 (en) * | 2001-12-23 | 2003-06-25 | Grundfos A/S | Stator with a modular construction |
Also Published As
| Publication number | Publication date |
|---|---|
| GB9112111D0 (en) | 1991-07-24 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| WAP | Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1) |