US3443137A - Laminations and magnetic core for motor stators and transformers - Google Patents
Laminations and magnetic core for motor stators and transformers Download PDFInfo
- Publication number
- US3443137A US3443137A US638479A US3443137DA US3443137A US 3443137 A US3443137 A US 3443137A US 638479 A US638479 A US 638479A US 3443137D A US3443137D A US 3443137DA US 3443137 A US3443137 A US 3443137A
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- United States
- Prior art keywords
- laminations
- magnetic core
- side walls
- lamina
- protuberance
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- 238000003475 lamination Methods 0.000 title description 20
- 239000000463 material Substances 0.000 description 11
- 230000000295 complement effect Effects 0.000 description 6
- 238000006073 displacement reaction Methods 0.000 description 6
- 238000004804 winding Methods 0.000 description 6
- 238000010276 construction Methods 0.000 description 4
- 241001446467 Mama Species 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 230000004907 flux Effects 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000009877 rendering Methods 0.000 description 1
- 230000002459 sustained effect Effects 0.000 description 1
Images
Classifications
-
- 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
- H02K1/141—Stator cores with salient poles consisting of C-shaped cores
- H02K1/143—Stator cores with salient poles consisting of C-shaped cores of the horse-shoe type
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Iron Core Of Rotating Electric Machines (AREA)
Description
R. A. M 'ELROY May 6, 1969 LAMINATIONS AND MAGNETIC CORE FOR MOTOR STATORS AND TRANSFORMERS Filed May 15, 1967 Russ: u. mama n 3R A m R P Agent United States Patent' 3,443,137 LAMINATIONS AND MAGNETIC CORE FOR MOTOR STATORS AND TRANSFORMERS Russell A. McElroy, Guelph, Ontario, Canada, assignor to Dominion Electrohome Industries Limited, Kitchener,
Ontario, Canada Filed May 15, 1967, Ser. No. 638,479 Int. Cl. H02k 1/00, 1/06 US. Cl. 310--216 Claims ABSTRACT OF THE DISCLOSURE This invention relates generally to laminated magnetic cores and stators such as are used in the construction of transformers and fractional horsepower electrical motors. More particularly, this invention relates to a two-part lamina for a magnetic core which, due to the necessity of applying an electrical winding thereto, must consist of two separate portions which are fitted complementally together after one of the portions has received the electrical winding.
Certain prior constructions for the above purpose have been attended by disadvantages, which it is the object of this invention to overcome. As is known, the steps in constructing a laminated magnetic core from a plurality of identical, two-part laminae are: (a) dividing the twopart laminae into two stacks, all of the first parts in one stack and all of the second parts in the other, (b) riveting or otherwise securing the stacks together into rigid, laminated core portions, (c) wrapping the one portion with the requisite electrical winding, and (d) pressfitting the two portions together under high pressure. In one prior art construction, one part of each lamina has a protuberance, and the other part of each lamination has a complementary recess into which the protuberance is adapted to be received during the press-fitting. Although the protuberance and the recess are complementary, and are often stamped in assembled relation simultaneously from the same piece of metal, there are nonetheless edge contortions and burrs which interfere in such a way that considerable pressure must be exerted to force the parts together. This ensures that, once assembled, the magnetic core will not part. At the same time, however, the interference of the burred and contorted edges during press-fitting causes a certain amount of material displacement to take place, and the displaced material often bridges across adjacent laminae and forms a cross-path for magnetic flux, setting up undesirable eddy currents. Furthermore, displaced material can accumulate between the two assembled parts of the magnetic core, and prevent surface-to-surface contact at some locations where this should occur. The resultant air gaps introduce reluctance into the magnetic path, and this of course is undesirable.
Besides reducing or eliminating the disadvantages listed in the foregoing paragraph, it is a further object of this invention to reduce the fitting pressure necessary to pressfit the two portions of the magnetic core together.
Accordingly, this invention provides a lamina for use in a laminated magnetic core, the lamina comprising two parts, one of the said parts having a protuberance projecting outwardly therefrom and the other of said parts having a recess complementary with said protuberance, such that the parts can fit complementally together, said protuberance being defined by two substantially parallel, outwardly non-convergent side walls and an out-ward wall which consists of a rectilinear portion forming an angle between and with one of said side walls and a curvilinear portion to which said rectilinear portion and the other of said side walls are both tangent.
One embodiment of this invention is shown in the accompanying drawings, in which like numerals refer to like parts throughout the several views, and in which:
FIGURE 1 is a perspective view of a fractional horsepower electric motor incorporating a core made from laminations according to this invention;
FIGURE 2 is a plan view of the two parts of the lamina to which this invention is directed; and
FIGURE 3 shows a portion of a prior art lamina in assembled condition.
Turning now to FIGURE 1, a fractional horsepower electric motor 10 includes a laminated core 12 consisting of a plurality of identical laminae 13. Each lamina 13 consists of two parts, a stator lamination 14 and a field lamination 15. The stator lamination 14 is the larger of the two, and is generally U-shaped in outline. As is best seen in FIGURE 2, the stator lamination 14 has a modified circular portion 18 removed from it, such that the periphery of the circular portion 18 can constitute the poles of the stator. Returning to FIGURE 1, it will be seen that a rotor 20 containing a secondary winding is fixed to a shaft 22 and is mounted to rotate freely within the cylindrical opening 23 provided by the alignment of the modified circular removed portions 18 of the several laminations 14. The shaft 22 has one end journaled in a support member 24, and the other end journaled in a similar support member (not visible). The support member 24 can be secured by conventional means 25, such as rivets or bolts and nuts, to the core 12. The core 12 also incorporates the conventional shading coils 26 antipodally adjacent the cylindrical opening 23.
It will be noted that the stator and field laminations 1'4 and 15 contact each other along junction lines 34. As best seen in FIGURE 2, the junction lines 34 constitute the outlines of two protuberances 36, each adapted to be received in a complementary recess 38 in the lamination 15. This invention lies in the particular shape given to the profile of the protuberances 36, and this particular profile will be dealt with in more detail after a brief explanation of the sequence of assembly of the motor shown in FIGURE 1, and of the disadvantages of the prior art profile shown in FIGURE 3.
The steps in assembling the laminated magnetic core of FIGURE 1 are as follows. First, the two-part laminae 13 are divided into two stacks, with all of the stator laminations 14 in one stack, and all of the field laminations 15 in the other stack. Then each stack is riveted together through rivet holes 40 to form the field and stator portions of the laminated core.
The field portion, comprising the field laminations 15, then receives the requisite electrical winding 32, following which the two portions of the laminated core are pressfitted together under high pressure.
The shape of the prior art protuberance 42 shown in FIGURE 3 has the following disadvantages. Firstly, be cause of contortions and burrs along the rectilinear surfaces 43, a considerable amount of material displacement is found to take place along the surfaces 43. The displaced material tends to accumulate at the points 44 and prevent the one portion 45 from closing completely against the other portion 46. Thus, air-gaps occur at the places marked 48, and air-gaps increase the reluctance of the magnetic path between the portions 45 and 46. Another problem relating to the displaced material is that the laminae, which are intended to be insulated from one another magnetically by means of a thin layer on either side of each lamination, are short-circuited magnetically by the displaced material, in such a way that undesirable eddy currents and counter-flux are set up in the magnetic path. Moreover, a considerable amount of force must be exerted to urge the two portions 45 and 46 together, due to the considerable amount of material displacement that takes place as a result of the interference of the burred and contorted edges, this force being of the order of four tons. The interference created by the upstanding burr extending over the elongated straight and well-supported side walls 43 makes it impossible to assemble units having a total lamination assembly thickness of, .50 inch and less without causing considerable distortion to the thin-walled sections in the stator, thus rendering the assembly useless.
In view of the above disadvantages, the protuberance profile of this invention was evolved, and its basic features are the following:
(a) The protuberance has two opposite side walls 50 and 51 which are substantially parallel, thus permitting the assembled core portion 15 to apply a pincer-like grip to the composite protuberance 36. Some departure from exact parallelism in the two side walls can be tolerated, but such departure can only be towards an outwardly diverging orientation. If the side walls 50 and 51 are made to diverge outwardly, the divergence should be kept to a minimum, for otherwise the assembly pressure required would be too high. If the side walls 50 and 51 were made to converge outwardly, little or no grip could be sustained by the recess 38 on the protuberance 36.
(b) Between the two side walls 50 and 51, there must be a rectilinear portion 53 which is adapted to achieve line-to-line contact with a complementary portion 54 on the recess. The angle formed between the side wall 50 and the rectilinear portion 53 can be from 90 to 175, but it should not be more than 175 in order to avoid material displacement along the rectilinear portion 53 during assembly.
The nose portion of the protuberance 36, Le. the portion between the side wall 51 and the rectilinear portion 53, should not have any sharp points in it. Thus, the remaining part of the profile of the protuberance 36 is a curvilinear portion 56 to which the rectilinear portion 53 and the side wall 51 are both tangent. Preferable, the curvilinear portion 56 is circular in curvature, but this is not essential. If any points occurred along the curvilinear portion 56, these would be areas of high stress and considerable material displacement.
Preferably, the angle between the side wall 50 and the rectilinear portion 53 is obtuse, and lies between 140 and 150, as this creates an optimum situation which permits a long line of contact (portion 53) along which no material displacement takes place during assembly.
In the embodiment shown in FIGURE 2, the side wall 51 extends further outwardly than does the side wall 50, and the side wall 50 extends further inwardly than the side wall 51. This is due to the sloping portion 53. If the side wall 51 extended as far inwardly as the side wall 4 50, the distance through which assembly pressure would have to be exerted would be too long, because this distance is the same as the length of the longest side wall. Thus, since side wall 51 begins further outwardly than the side wall 50, the inner limit of wall 51 is likewise further outward than the inner limit of wall 50.
In FIGURE 2, the curvilinear portion 56 is shown to be circular, but this is not essential.
It was found that with the construction shown in FIG- URE 2, the assembly pressure required was reduced from about four tons to about two tons, and that the general performance of the motor was improved over similar motors utilizing the design of FIGURE 3.
While a preferred embodiment of this invention has been disclosed herein, those skilled in the art will appreciate that changes and modifications may be made therein without departing from the spirit and scope of this invention as defined in the appended claims.
What I claim as my invention is:
1. A lamina for use in a laminated magnetic core, the lamina comprising two parts, one of said parts having a protuberance projecting outwardly therefrom and the other of said parts having a recess complementary with said protuberance, such that the parts can fit complementally together, said protuberance being defined by two substantially parallel, outwardly non-convergent side walls and an outward wall which consists of a rectilinear portion forming an angle between and 175 with one of said side walls and a curvilinear portion to which said rctilinear portion and the other of said side walls are both tangent.
2. A lamina as claimed in claim 1, in which said angle is between and 3. A lamina as claimed in claim 2, in which said curvilinear portion is circular.
4. A lamina as claimed in claim 1, in which said one of said parts is substantially U-shaped and has one said protuberance at each of its free ends, the mean direction of the substantially parallel sides of one of said protuberances being substantially parallel to the mean direction of the substantially parallel sides of the other of said protuberances, said other of said parts bridging between said free ends and having two said recesses positioned to receive simultaneously said two protuberances.
5. A lamina as claimed in claim 4, in which said ohtuse angle is between 140 and 150.
6. A lamina as claimed in claim 1, in which said other of said side walls extends further outwardly than does said one of said side walls.
7. A lamina as claimed in claim 6, in which said one of said side walls extends further inwardly than does said other of said side walls.
8. A lamina as claimed in claim 5, in which the two protuberances are disposed enantiomorphically.
9. A laminated magnetic core comprised of a plurality of identical laminations according to claim 4.
10. A lamina as claimed in claim 8, in which said other of said side walls extends further outwardly than does said one of said side walls, and in which said one of said side walls extends further inwardly than does said other of said side walls.
References Cited UNITED STATES PATENTS 2,064,090 12/1936 Sullivan et al. 310-259 2,291,013 7/1942 Wheeler 310259 X 2,487,258 11/1949 Morris 310-254 X 3,365,687 1/1968 Capell 3362l0 WARREN E. RAY, Primary Examiner.
US. Cl. X.R.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
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US63847967A | 1967-05-15 | 1967-05-15 |
Publications (1)
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US3443137A true US3443137A (en) | 1969-05-06 |
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US638479A Expired - Lifetime US3443137A (en) | 1967-05-15 | 1967-05-15 | Laminations and magnetic core for motor stators and transformers |
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Cited By (26)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3694903A (en) * | 1970-06-03 | 1972-10-03 | Alliance Mfg Co | Method of making a stator |
US3793129A (en) * | 1971-09-10 | 1974-02-19 | V & E Friedland Ltd | Two-part transformer lamination of slidingly engageable parts |
DE2724270A1 (en) * | 1976-06-03 | 1977-12-22 | Gould Inc | ELECTRIC MOTOR |
US4707910A (en) * | 1984-02-25 | 1987-11-24 | Black & Decker Inc. | Method of assembling electric motors |
US4777394A (en) * | 1986-07-14 | 1988-10-11 | Kabushiki Kaisha Sankyo Seiki Seisakusho | Miniature generator |
US4831296A (en) * | 1986-05-12 | 1989-05-16 | Koichi Nagaba | Rotary device |
US5402028A (en) * | 1990-11-29 | 1995-03-28 | Robert Bosch Gmbh | Stator for an electric machine |
US20050057113A1 (en) * | 2003-09-05 | 2005-03-17 | Du Hung T. | Field assemblies and methods of making same |
US20050099087A1 (en) * | 2003-09-05 | 2005-05-12 | Du Hung T. | Electric motor with field assemblies having core pieces with mating features |
US20050189844A1 (en) * | 2003-09-05 | 2005-09-01 | Du Hung T. | Field assemblies having pole pieces with dovetail features for attaching to a back iron piece(s) and methods of making same |
US20050189840A1 (en) * | 2003-09-05 | 2005-09-01 | Du Hung T. | Field assemblies having pole pieces with axial lengths less than an axial length of a back iron portion and methods of making same |
US20050189839A1 (en) * | 2003-09-05 | 2005-09-01 | Du Hung T. | Field assemblies having pole pieces with ends that decrease in width, and methods of making same |
US20050223541A1 (en) * | 2003-10-29 | 2005-10-13 | A.O. Smith Corporation | Electrical machine and method of manufacturing the same |
US20060028087A1 (en) * | 2004-08-09 | 2006-02-09 | A.O. Smith Corporation | Electric motor having a stator |
GB2419474A (en) * | 2004-10-20 | 2006-04-26 | Yi-Yin Lin | Assembly of stator laminated plates of an enclosed type motor |
US20060158303A1 (en) * | 2005-01-14 | 2006-07-20 | Lincoln Global, Inc. | Snap-together choke and transformer assembly for an electric arc welder |
US20060226729A1 (en) * | 2003-09-05 | 2006-10-12 | Du Hung T | Field assemblies and methods of making same with field coils having multiple coils |
US20070057580A1 (en) * | 2003-10-23 | 2007-03-15 | Empresa Brasileira De Compressores S.A. | Annular stack of lamination elements |
US20070096587A1 (en) * | 2005-10-31 | 2007-05-03 | Ionel Dan M | Stator assembly for an electric machine and method of manufacturing the same |
US7259487B2 (en) | 2003-12-08 | 2007-08-21 | A.O. Smith Corporation | Electric machine including circuit board mounting means |
US20070241629A1 (en) * | 2006-04-13 | 2007-10-18 | A. O. Smith Corporation | Electric machine, stator assembly for an electric machine, and method of manufacturing the same |
US20070252447A1 (en) * | 2004-08-09 | 2007-11-01 | A.O. Smith Corporation | Electric motor having a stator |
US20080303369A1 (en) * | 2007-06-08 | 2008-12-11 | A. O. Smith Corporation | Electric motor, stator for an electric motor and method of manufacturing same |
US20110115314A1 (en) * | 2003-09-05 | 2011-05-19 | Black And Decker Inc. | Power tools with motor having a multi-piece stator |
US8276279B2 (en) | 2010-08-09 | 2012-10-02 | Wahl Clipper Corporation | Hair clipper with a vibrator motor |
US20170277131A1 (en) * | 2013-09-27 | 2017-09-28 | Casio Computer Co., Ltd. | Stepping motor and timepiece |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2064090A (en) * | 1934-05-23 | 1936-12-15 | Gen Motors Corp | Motor |
US2291013A (en) * | 1940-01-30 | 1942-07-28 | Gen Ind Co | Magnetic circuit and method of forming same |
US2487258A (en) * | 1946-11-29 | 1949-11-08 | Zenith Radio Corp | Shaded pole motor |
US3365687A (en) * | 1964-11-12 | 1968-01-23 | Gen Ind Co | Core joint having locking wedges |
-
1967
- 1967-05-15 US US638479A patent/US3443137A/en not_active Expired - Lifetime
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2064090A (en) * | 1934-05-23 | 1936-12-15 | Gen Motors Corp | Motor |
US2291013A (en) * | 1940-01-30 | 1942-07-28 | Gen Ind Co | Magnetic circuit and method of forming same |
US2487258A (en) * | 1946-11-29 | 1949-11-08 | Zenith Radio Corp | Shaded pole motor |
US3365687A (en) * | 1964-11-12 | 1968-01-23 | Gen Ind Co | Core joint having locking wedges |
Cited By (49)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3694903A (en) * | 1970-06-03 | 1972-10-03 | Alliance Mfg Co | Method of making a stator |
US3793129A (en) * | 1971-09-10 | 1974-02-19 | V & E Friedland Ltd | Two-part transformer lamination of slidingly engageable parts |
DE2724270A1 (en) * | 1976-06-03 | 1977-12-22 | Gould Inc | ELECTRIC MOTOR |
US4071787A (en) * | 1976-06-03 | 1978-01-31 | Gould Inc. | Welded stator for electric motors |
US4707910A (en) * | 1984-02-25 | 1987-11-24 | Black & Decker Inc. | Method of assembling electric motors |
US4831296A (en) * | 1986-05-12 | 1989-05-16 | Koichi Nagaba | Rotary device |
US4777394A (en) * | 1986-07-14 | 1988-10-11 | Kabushiki Kaisha Sankyo Seiki Seisakusho | Miniature generator |
US5402028A (en) * | 1990-11-29 | 1995-03-28 | Robert Bosch Gmbh | Stator for an electric machine |
US8207647B2 (en) | 2003-09-05 | 2012-06-26 | Black & Decker Inc. | Power tools with motor having a multi-piece stator |
US7078843B2 (en) | 2003-09-05 | 2006-07-18 | Black & Decker Inc. | Field assemblies and methods of making same |
US20050099085A1 (en) * | 2003-09-05 | 2005-05-12 | Du Hung T. | Electric motor having a field assembly with slot insulation |
US20050189844A1 (en) * | 2003-09-05 | 2005-09-01 | Du Hung T. | Field assemblies having pole pieces with dovetail features for attaching to a back iron piece(s) and methods of making same |
US20050189840A1 (en) * | 2003-09-05 | 2005-09-01 | Du Hung T. | Field assemblies having pole pieces with axial lengths less than an axial length of a back iron portion and methods of making same |
US20050189839A1 (en) * | 2003-09-05 | 2005-09-01 | Du Hung T. | Field assemblies having pole pieces with ends that decrease in width, and methods of making same |
US20110115314A1 (en) * | 2003-09-05 | 2011-05-19 | Black And Decker Inc. | Power tools with motor having a multi-piece stator |
US20050057113A1 (en) * | 2003-09-05 | 2005-03-17 | Du Hung T. | Field assemblies and methods of making same |
US7233091B2 (en) | 2003-09-05 | 2007-06-19 | Black & Decker Inc. | Electric motor with field assemblies having core pieces with mating features |
US20050099087A1 (en) * | 2003-09-05 | 2005-05-12 | Du Hung T. | Electric motor with field assemblies having core pieces with mating features |
US8558420B2 (en) | 2003-09-05 | 2013-10-15 | Black & Decker Inc. | Power tool with motor having a multi-piece stator |
US20060226729A1 (en) * | 2003-09-05 | 2006-10-12 | Du Hung T | Field assemblies and methods of making same with field coils having multiple coils |
US7146706B2 (en) | 2003-09-05 | 2006-12-12 | Black & Decker Inc. | Method of making an electric motor |
US7528520B2 (en) | 2003-09-05 | 2009-05-05 | Black & Decker Inc. | Electric motor having a field assembly with slot insulation |
US7205696B2 (en) | 2003-09-05 | 2007-04-17 | Black & Decker Inc. | Field assemblies having pole pieces with ends that decrease in width, and methods of making same |
US7211920B2 (en) | 2003-09-05 | 2007-05-01 | Black & Decker Inc. | Field assemblies having pole pieces with axial lengths less than an axial length of a back iron portion and methods of making same |
US20070057580A1 (en) * | 2003-10-23 | 2007-03-15 | Empresa Brasileira De Compressores S.A. | Annular stack of lamination elements |
US7669311B2 (en) | 2003-10-29 | 2010-03-02 | A. O. Smith Corporation | Method of manufacturing a core for an electrical machine |
US20050223541A1 (en) * | 2003-10-29 | 2005-10-13 | A.O. Smith Corporation | Electrical machine and method of manufacturing the same |
US7259487B2 (en) | 2003-12-08 | 2007-08-21 | A.O. Smith Corporation | Electric machine including circuit board mounting means |
US7247967B2 (en) | 2004-08-09 | 2007-07-24 | A. O. Smith Corporation | Electric motor having a stator |
US20070252447A1 (en) * | 2004-08-09 | 2007-11-01 | A.O. Smith Corporation | Electric motor having a stator |
US7737598B2 (en) | 2004-08-09 | 2010-06-15 | A. O. Smith Corporation | Electric motor having a stator |
US20060028087A1 (en) * | 2004-08-09 | 2006-02-09 | A.O. Smith Corporation | Electric motor having a stator |
GB2419474A (en) * | 2004-10-20 | 2006-04-26 | Yi-Yin Lin | Assembly of stator laminated plates of an enclosed type motor |
US7646281B2 (en) | 2005-01-14 | 2010-01-12 | Lincoln Global, Inc. | Snap-together choke and transformer assembly for an electric arc welder |
US20060158303A1 (en) * | 2005-01-14 | 2006-07-20 | Lincoln Global, Inc. | Snap-together choke and transformer assembly for an electric arc welder |
US7821175B2 (en) | 2005-10-31 | 2010-10-26 | A.O. Smith Corporation | Stator assembly for an electric machine and method of manufacturing the same |
US20070096587A1 (en) * | 2005-10-31 | 2007-05-03 | Ionel Dan M | Stator assembly for an electric machine and method of manufacturing the same |
US20080129140A1 (en) * | 2005-10-31 | 2008-06-05 | A. O. Smith Corporation | Stator assembly for an electric machine and method of manufacturing the same |
US7468570B2 (en) | 2005-10-31 | 2008-12-23 | A. O. Smith Corporation | Stator assembly for an electric machine and method of manufacturing the same |
US7348706B2 (en) | 2005-10-31 | 2008-03-25 | A. O. Smith Corporation | Stator assembly for an electric machine and method of manufacturing the same |
US20090085415A1 (en) * | 2005-10-31 | 2009-04-02 | A. O. Smith Corporation | Stator assembly for an electric machine and method of manufacturing the same |
US20070241629A1 (en) * | 2006-04-13 | 2007-10-18 | A. O. Smith Corporation | Electric machine, stator assembly for an electric machine, and method of manufacturing the same |
US7687965B2 (en) | 2006-04-13 | 2010-03-30 | A. O. Smith Corporation | Electric machine, stator assembly for an electric machine, and method of manufacturing the same |
US20080303369A1 (en) * | 2007-06-08 | 2008-12-11 | A. O. Smith Corporation | Electric motor, stator for an electric motor and method of manufacturing same |
US7821176B2 (en) | 2007-06-08 | 2010-10-26 | A.O. Smith Corporation | Electric motor, stator for an electric motor and method of manufacturing same |
US8276279B2 (en) | 2010-08-09 | 2012-10-02 | Wahl Clipper Corporation | Hair clipper with a vibrator motor |
US8549756B2 (en) | 2010-08-09 | 2013-10-08 | Wahl Clipper Corporation | Hair clipper with a vibrator motor |
US20170277131A1 (en) * | 2013-09-27 | 2017-09-28 | Casio Computer Co., Ltd. | Stepping motor and timepiece |
US10331085B2 (en) * | 2013-09-27 | 2019-06-25 | Casio Computer Co., Ltd. | Stepping motor and timepiece |
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