GB2271219A - Preventing interlayer shorting in a magnetic alloy laminate - Google Patents
Preventing interlayer shorting in a magnetic alloy laminate Download PDFInfo
- Publication number
- GB2271219A GB2271219A GB9318991A GB9318991A GB2271219A GB 2271219 A GB2271219 A GB 2271219A GB 9318991 A GB9318991 A GB 9318991A GB 9318991 A GB9318991 A GB 9318991A GB 2271219 A GB2271219 A GB 2271219A
- Authority
- GB
- United Kingdom
- Prior art keywords
- magnetic alloy
- particulate filler
- strips
- stack
- coating
- 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- Withdrawn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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
- B32B7/04—Interconnection of layers
- B32B7/12—Interconnection of layers using interposed adhesives or interposed materials with bonding properties
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F1/00—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties
- H01F1/01—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials
- H01F1/03—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity
- H01F1/12—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials
- H01F1/14—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials metals or alloys
- H01F1/16—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials metals or alloys in the form of sheets
- H01F1/18—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials metals or alloys in the form of sheets with insulating coating
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F3/00—Cores, Yokes, or armatures
- H01F3/02—Cores, Yokes, or armatures made from sheets
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K1/00—Details of the magnetic circuit
- H02K1/04—Details of the magnetic circuit characterised by the material used for insulating the magnetic circuit or parts thereof
-
- 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
- H02K15/02—Methods or apparatus specially adapted for manufacturing, assembling, maintaining or repairing of dynamo-electric machines of stator or rotor bodies
-
- 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
- H02K15/12—Impregnating, heating or drying of windings, stators, rotors or machines
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Chemical & Material Sciences (AREA)
- Dispersion Chemistry (AREA)
- Laminated Bodies (AREA)
- Soft Magnetic Materials (AREA)
- Adhesives Or Adhesive Processes (AREA)
Abstract
A bond layer (12) between two layers (11, 11) of uncoated, magnetic alloy strips comprises a particulate filler (13) having an average particle size sufficient to prevent interlayer shorting of the magnetic alloy strip. Methods of making a stack of laminates for use in a transformer, stator or rotor are described. The preferred particulate filler is a hollow thick-walled silica-alumina alloy spheroid of mean size from 0.5 to 8 microns and the average thickness of the bond layer is from 3 to 25 microns. A composition useful for binding electrical laminates is formed by an epoxy adhesive and a hollow thick-walled silica-alumina alloy spheroid. Minimising the thickness of the layer between magnetic alloy strips is said to improve efficiency and reduce performance variations between units. <IMAGE>
Description
2271219 LAMINATED ARTICLES, AND METHODS OF AND COMPOSITIONS FOR MAKING THE
SAME The invention relates to articles containing at least two layers of uncoated, magnetic alloy strips having bond layers between the magnetic alloy strips, to methods of making the same, and to compositions useful in binding electrical laminants.
High frequency alternator and generator armatures and rotor cores are constructed from stacks of thin gauge laminations. These laminations are produced by stamping magnetic alloy strip. Typically the magnetic alloy strips are coated with a material, such as an inorganic phosphate coating. The coating permits high temperature annealing of the laminations and provides electrical insulation between laminations in the stacked core.
A problem associated with coating the magnetic alloy strips is uneven coating. Uneven coatings limit unit efficiency and increases unit-to-unit performance variations. The uneven coating also causes variations in bonded stack height dimensions.
Another problem caused by the coating is adhesive failures. The coating on the magnetic alloy strips interferes with the adhesive used to bind the magnetic alloy strips. The coating causes weak bonds, which leads to delamination of the magnetic alloy strips.
The armature and rotor cores are normally produced by bonding a large number of laminations into a single core assembly. Bonding is used rather than mechanical joining to prevent interlaminar shorting and eddy current loses.
Another problem associated with armature and rotor core production is stamping burrs which are left on the laminations. The stamping burrs may have sufficient height to introduce interlaminar shorting producing eddy currents within the stack. The stamping burrs also lead to uneven stacking of the laminant layers.
2 It is desirous to produce a high efficiency armature or rotor core by minimizing the thickness of the adhesive layer between the magnetic alloy strips to improve efficiency and reduce unit-to-unit performance variation.
According to the invention, there is provided an article, comprising at least two layers of an uncoated, magnetic alloy strip, and at least one bond layer between the magnetic alloy strips, wherein the bond layer includes a particulate filler having an average particle size sufficient to prevent interlayer shorting of the magnetic alloy strips.
According to the invention, there is also provided a method of preparing an electrical laminant, comprising the steps of coating magnetic alloy strips with a binding composition including a particulate filler having an average particle size sufficient to prevent interlaminar shorting, applying pressure to a stack of the coated magnetic alloy strips and curing the binding composition.
According to the invention, there is provided a composition useful in binding electrical laminants, comprising (i) an epoxy adhesive and (ii) a hollow, thick-walled, si lica-alumina alloy sphere.
Articles and compositions embodying the invention, and methods according to the invention, of making such articles, will now be described, by way of example only, with reference to the accompanying drawings, in which:Figure 1 is a cross-section of two magnetic alloy strips bonded together; and Figure 2 is a cross-section of a stack of bonded magnetic alloy strips.
As used in the specifications and claims herein, the term "interlayer or interlaminar shorting refers to contact between a magnetic alloy strip and a different magnetic alloy strip. This contact results in electrical current running between the layers. This electrical current, eddy current, reduces the efficiency of the laminant core.
As used in the specification and claims, "stacking factor" refers to the ratio of actual magnetic material present in each stacked core to a core composed only of magnetic material (e.g., solid). ASTM D-718 describes the procedure for determining the stacking factor-of the core.
The magnetic alloy strips used in the present invention are uncoated. The magnetic alloy strips are generally available commercially as-rolled and annealed stock with a corrosion preventing oil coating and vapor barrier seal. The magnetic alloy strips are often referred to as transformer stock. The magnetic alloy strips include silicon steel alloy, nickel steel alloy, and vanadium per'madur. A particularly useful magnetic alloy strip is comprises a silicon steel alloy strip, preferably a silicon steel alloy strip having up to 9% by weight, more preferably up to about 6% by weight silicon. The magnetic alloy strips generally have a thickness less than about 0.51 mm (0.02 inches).
A bond layer is placed between the uncoated, magnetic alloy strips. The bond layer includes a particular. filler having an average particle size sufficient to; prevent interlayer shorting of the magnetic alloy strips. In one embodiment the particle filler has an average particle size from about 0.5, or about 0.9, or about 1.0. The particle size of the filler may be up to about 8, or to about 7, or to about 6 microns. In one embodiment the particulate filler has a median particle size from about 0.5, or about 0.9 or about 1 up to about 2, or to about 1.8, or to about 1. 6, or to about 1. 4 microns. In another embodiment the particulate f iller has a mean particle size f rom about 0. 5, or about 1, or about 2 up to about 8, or to about, or to about 6 microns. The mean particle size is determined by the Malvern 3600 Particle Size Analyzer. The particulate filler has a narrow particle distribution. In one embodiment, the particulate f iller has a particle size distribution by volume of loot less-thanabout 20 microns, or about 99.9% less-than about 15-microns, and or about 97.2% less than about 11 microns The particulate fillers are generally used at a level from about 5%, or about 7%, or about 9% up to about 25%, or to about 18%, or to about 16%, or about 14% by weight of the adhesive and particulate filler. In one embodiment, the particulate filler is used with an inorganic binder. In this embodiment, the particulate filler is generally present in an amount from about 9%, or about 12% up to about 25%, or to about 22%, or to about 20% by weight of the inorganic binder and particulate filler.
The particulate filler may be any non-conductive filler having a particle size, as described herein.
Examples of particulate fillers include ceramic microspheres, and chopped glass fibers. In one embodiment, the particulate filler comprises a ceramic microsphere, and especially a hollow, thick-walled, silica-alumina alloy microsphere. An example of this ceramic microsphere is ZeeospheresO fillers available commercially from 3M Chemical Company. A particularly useful ceramic microsphere is ZeeosphereM 200. Zeeospherem 200 is characterized as having a median particle size of 1.3 microns; a mean particle size of a particle size of 5.3 microns; a distribution by volume of 90% less than 9.0 microns, 50% less than 5.1 microns, and 10% less than 2.2 microns. The residual weight percent retained on a 325 mesh (45 micron) screen is 0.01% (determined by ASTM D 185).
The particulate filler is combined with an adhesive to f orm the bond layer (B). The bond layer, or bondline, generally has a thickness from about 3, or about 5, or about 7 up to about 25, or about 20, or about 15 microns. The bond layer: is generally.-.. thick enough to provide electrical insulation: betweCn-.-,the,magnetia alloy strips but thin enough to provide optimal stacking factor.
As described above, the bond layer also includes a cured adhesive. The adhesive may be phenolic, silicon rubber or an epoxy adhesive. Generally, epoxy adhesives are preferred. Epoxy adhesives are generally diglycidyl ethers of bisphenol A derived from bisphenol A and epichlorohydrin. one way of preparing epoxy resins is a two part adhesive package. The first part contains a dichlorohydrin of bisphenol A. The other part contains a curing agent. Curing agents include anhydrides, amines, polyamines, Lewis acids, etc. Important classes of curing agents include polyamines, polyaminoamides (formed from polyamines and dimerized fatty acids e.g., acids containing 1 to 30 carbon atoms), polyphenols, polymeric thiols, polycarboxylic acids, and anhydrides. An example of a useful epoxy adhesive is Bondmaster E645 adhesive, available commercially from National Starch and Chemical Company.
In another embodiment, the binder composition also includes a cured inorganic binder. The inorganic binder together with the particulate filler form an inorganic bond layer between the uncoated, magnetic alloy steel strips.
An example of a useful inorganic binder is Cerama-bindlu binder available commercially from Aremco Products Inc. A particularly useful inorganic binder is Cerama-bind" 644.
The invention is further exemplified with reference to the drawings. In f igure 1, magnetic alloy strips 11 are bonded together with bonding layer 12. Bonding layer 12 has particulate matter 13 dispersed within the bonding layer.
In figure 2, the stack is composed of magnetic alloy strip layers 21 having bonding layers 22 between each layer of magnetic alloy strip.
The invention also relates to a method of preparing an electrical laminant comprising the steps of (1) coating a magnetic alloy strip with a binding composition including a particulate filler having an average particle size sufficient to prevent interlaminar shorting, (2) forming a stack of coated magnetic alloy strips, (3) applying pres sure to the stack, and (4) curing the binding composition.
In another embodiment, the invention also relates to a method of preparing an electrical laminant comprising the steps of (1) forming a stack of uncoated, magnetic alloy strips, (2) coating the magnetic alloy strips with a binding composition including a particulate filler having an average particle size sufficient to prevent interlaminar shorting, (3) applying pressure to the stack, and (4) curing the binding composition.
Generally, the uncoated, magnetic alloy strips are cleaned and degreased. Cleaning is generally accomplished by using methyl ethyl ketone or any degreasing solvent.
The magnetic alloy strips are then coated with a binding composition. The amount of time between degreasing and coating should be minimized to prevent rusting of the magnetic alloy strips. The magnetic alloy strips may be coated by any means known to those in the art, such as painting, spraying, dip coating, etc.
In one embodiment, the magnetic alloy strips are vacuum impregnated with the binding composition.
Generally, the individual cleaned, uncoated magnetic alloy strips, or a stack (loosely bound) of uncoated,, magnetic alloy strips are placed-under Vacuum in a suitable vessel.
The vessel is then flooded with-the! binding composition.
The magnetic alloy strips, or stacks thereof generally remain in the binding composition for about 15-30 minutes.
Vacuum is released and excess binding composition is drained from the individual strips or stack. The vacuum generally acts to prevent inclusion of air bubbles in the coating of the individual alloy strips or stacks. The vacuum is generally below about 100 mm Hg, or below about mm Hg. A vacuum of 20-30 mm Hg is particularly useful.
In another embodiment, individual magnetic alloy strips are placed in the suitable vessel. A vacuum is pulled on the vessel and the strips are dipped into a binding composition. The vacuum is released and the strips are removed from the binding composition and dried.
In the present invention, the coated magnetic alloy strips are formed into a stack as is known to those in the art. The exact stacking arrangement is not critical to the present invention. After the individual alloy strips have been coated and formed into a stack or coated as a stack, pressure is applied to the stack. Pressure can be applied by any means known to those skilled in the art, such as by applying spring pressure. The pressure is generally from about 4,500, or about 6,000, or about 9,000, up to about 20,000, or about 18,000 newtons (from about 1,000 to about 4,400 pounds).
The binding composition is-cured while maintaining pressure on the stack. Curing generally occurs at a temperature of about 650C,,or about BOOC, or about 1250C up to about 2400C, or to about 2000C (from about 150OF to about 450OF)... Generally, -the, curing occurs within about 0. 5, - or about, 1. hours eup:Tto-,; about! 5 hours, or to. about 3 hours. The curing time begins after the stack has reached curing temperatures. After curing the binding composition the stack is generally allowed to return to ambient temperatures and the pressure is released from the stack.
In another embodiment, invention relates to a composi tion useful in binding electrical laminants comprising (i) an epoxy adhesive and (ii) a hollow, thick-walled, silica is alumina alloy microsphere. The epoxy adhesive and silica alumina alloy microsphere have been described above.
The following example relates to the articles, methods, and compositions of the present invention. Unless otherwise indicated, as used in the examples as well as elsewhere in the specification and claims, parts are parts by weight, and temperatures is in degree celsius.
Example
A binding composition is prepared by mixing 45 parts of Bondmaster E645 is added to 49 parts of methyl ethyl ketone. Then, 6 parts of ZeeosphereO 200 is added to the mixture and blended until a uniform composition is ob tained. The viscosity of the mixture is 30 seconds in a #1 Zahn cup at room temperature.
Lamination surfaces of a transformer stock having about 6% silicon, are cleaned and degreased using methyl ethyl ketone. The binding composition above is sprayed on the lamination surfaces to a dry film thickness of 12.5 to mm (0.5 to 1 nil). Solvent is removed at about 650C for to 60 minutes in a forced air oven. Thecoated laminants are stacked in a fixture. A clamping force of 4,500 to 18,000 newtons (1,000 - 4,000 pounds gage) is applied to- the stack by spring. The clamped stack is placed in a forced air oven at 175C for 2 hours. The two hours begin after the stack has reached oven temperature.
After two hours, the stack is removed and allowed to cool to room temperature. After cooling to room temperature the spring pressure is removed from the stack. The stack is then removed and useable in a transformer, stator or rotor, as known to those in the art.
Table 1
In Table 1, laminations are made by the above described procedure. Table 1 contains data comparing the effects of the binding compositions on stacking factor and resistivity of uncoated, magnetic alloy strips. Examples 1, 2, and 3 relate to the present invention and include particulate filler (Zeeospherem 200) in the binding composition. Examples 4, 5, and 6 are comparative examples and relate to laminations made from bare transformer stock without the use of particulate filler. Examples 7, 8, and 9 are comparative examples and relate to coated magnetic alloy strips which are bound together by the epoxy adhesive, Bondmaster E645.
-10L.
1 TabLe 1
Ex. Lamination Fitter Force gem Ave. Surface (Newtons) Thickness Stacking Resistivity - (microns) Factor (AST9 A718) 1 Bare Yes 4500 10.3 0.926 84.30 2 Bare Yes 9OW 7.9 0.942 7.50 3 Bare Yes 18,000 8.2 0.940 1.08 4 Bare None 4500 3.1 0.976 0.19 Bare None 9000 1.1 0.992 0.03 6 Bare None 18,000 0.4 0.997 0.03 7 Coated None 4500 2.1 0.938 9.53 Coated None 9000 2.8 0.934 7.69 9 Coated None 18,000 0.8 0.948 1.75 As can be seen from the above table, stacks made with bare lamination and f iller (Examples 1, 2, and 3) have lower dimensional variation and higher resistivity compared to stacks made with bare laminations and no filler (Examples 4, 5, and 6).. Examples 1, 2, and 3 have more consistent stackifig factor and bondline thickness at different clamping forces. Examples 1, 2, and 3 show no bondline separation (delamination). Applicants have discovered that the use of a particulate filler leads to lamination separation control which provides consistent stack density, consistent stack height and minimized stack shorting.
-1 While the invention has been explained in relation to 1 its preferred embodiments, it is to be understood that various modifications thereof will become apparent to those skilled in the art upon reading the specification. Therefore, it is to be understood that the invention disclosed herein is intended to cover such modifications as well as fall within the scope of the appendant claim.
12
Claims (23)
1. An article, comprising at least two layers of an uncoated, magnetic alloy strip, and at least one bond layer between the magnetic alloy strips, wherein the bond layer includes a particulate filler having an average particle size sufficient to prevent interlayer shorting of the magnetic alloy strips.
2. An article according to claim 1, wherein the layers of uncoated magnetic alloy strip comprise transformer stock.
3. An article according to claim 1, wherein the layers of uncoated magnetic alloy strip comprise a silicon steel alloy, nickel steel alloy, or vanadium permadur.
4. An article according to any preceding claim, wherein the particulate filler has an mean particle size from about 0.5 to about 8 microns.
5. An article according to any preceding claim, wherein the particulate filler is selected from the group consisting of a ceramic microsphere and a chopped glass fiber.
6. An article according to any one of claims 1 to 3, wherein the particulate filler comprises a hollow, thick-walled, silica-alumina alloy microsphere.
7. An article according to any preceding claim, wherein the bond layer has an average thickness from about 3 to about 25 microns.
8. An article according to any preceding claim,- 13 wherein the bond layer comprises a cured adhesive.
9. An article according to claim 8, wherein the adhesive comprises a cured epoxy adhesive.
10. An article according to any one of claims 1 to 7J. wherein the bond layer comprises a cured inorganic binder.
11. A method of preparing an electrical laminant, comprising the steps of coating magnetic alloy strips with a binding composition including a particulate filler having an average particle size sufficient to prevent interlaminar shorting, applying pressure to a stack of the coated magnetic alloy strips and curing the binding composition.
12. A method according to claim 11, in which the coating step comprises the step of individually coating the strips, and including the step of then forming the stack of the coated strips prior to the pres sureapplying step.
13. A method according to -claim 11, including the step of forming a stack of the uncoated magnetic alloy strips, and in which the coating step comprises the step of coating the stack of magnetic alloy strips.
14. A method according to any one of claims 11 to 13, wherein the coating step comprises vacuum impregnation coating.
15. A method according to any one of claims 11 to 14, wherein the particulate filler is selected from the group consisting of a ceramic microsphere, and a chopped glass fiber.
14
16. A method according to any one of claims 11 to 14, wherein the particulate filler comprises a hollow, thick-walled, silica-alumina alloy microsphere.
17. A method according to any one of claims 11 to 16, wherein the pressure the pressure-applying step is from about 4500 to about 20,000 newtons.
18. A method according to any one of claims 11 to 17, wherein the curing step occurs from about 65 0 C to about 250 0 C.
19. A composition useful in binding electrical laminants, comprising (i) an epoxy adhesive and (ii) a hollow, thick-walled, silica-alumina alloy sphere.
20. An article comprising a transformer, stator, or rotor containing the article of claim 1.
21. An article substantially as described with reference to the accompanying drawing.
22. A method substantially as described with reference to the accompanying drawing.
23. A composition useful in binding electrical components, substantially as described with reference to the accompanying drawings.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US94931792A | 1992-09-22 | 1992-09-22 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| GB9318991D0 GB9318991D0 (en) | 1993-10-27 |
| GB2271219A true GB2271219A (en) | 1994-04-06 |
Family
ID=25488905
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB9318991A Withdrawn GB2271219A (en) | 1992-09-22 | 1993-09-14 | Preventing interlayer shorting in a magnetic alloy laminate |
Country Status (3)
| Country | Link |
|---|---|
| CA (1) | CA2106110A1 (en) |
| DE (1) | DE4331787A1 (en) |
| GB (1) | GB2271219A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1503476A1 (en) * | 2002-05-08 | 2005-02-02 | Daikin Industries, Ltd. | Electric motor and compressor |
| FR2888390A1 (en) * | 2005-07-08 | 2007-01-12 | Cnes Epic | METHOD FOR MANUFACTURING MAGNETIC LAMINATE CIRCUIT |
| DE102011079843A1 (en) * | 2011-07-26 | 2013-01-31 | Siemens Aktiengesellschaft | Electric machine with low-mass design in magnetically active parts |
| WO2014009182A1 (en) * | 2012-07-12 | 2014-01-16 | Hella Kgaa Hueck & Co. | Transformer for storing and filtering |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE19901313C1 (en) | 1999-01-15 | 2000-10-12 | Thyssenkrupp Stahl Ag | Composite material in the form of a band or sheet made of two steel cover plates that can be resistance-welded to one another and an intermediate layer made of a filler, process for its production and plant for carrying out the process |
| EP2054992B1 (en) | 2006-08-14 | 2012-12-12 | Brose Fahrzeugteile GmbH & Co. KG, Würzburg | Rotor for an electric motor |
| AT516197A1 (en) | 2014-09-05 | 2016-03-15 | Voestalpine Stahl Gmbh | Coil and method of making a coil-wound electrical steel laminate |
| DE102020208689A1 (en) | 2020-07-10 | 2022-01-13 | Elringklinger Ag | Connection material, sheet metal stack, machine component and electric motor |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB925200A (en) * | 1958-05-23 | 1963-05-01 | Honeywell Regulator Co | Improvements in magnetic core structure |
| GB1056355A (en) * | 1962-10-12 | 1967-01-25 | Gen Electric | Process for coating ferrous material and material coated by such process |
| GB2132418A (en) * | 1982-12-03 | 1984-07-04 | Blum Gmbh & Co E | Electrical sheet metal for the manufacture of laminated cores for static or dynamic electromagnetic devices |
-
1993
- 1993-09-14 CA CA 2106110 patent/CA2106110A1/en not_active Abandoned
- 1993-09-14 GB GB9318991A patent/GB2271219A/en not_active Withdrawn
- 1993-09-18 DE DE19934331787 patent/DE4331787A1/en not_active Withdrawn
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB925200A (en) * | 1958-05-23 | 1963-05-01 | Honeywell Regulator Co | Improvements in magnetic core structure |
| GB1056355A (en) * | 1962-10-12 | 1967-01-25 | Gen Electric | Process for coating ferrous material and material coated by such process |
| GB2132418A (en) * | 1982-12-03 | 1984-07-04 | Blum Gmbh & Co E | Electrical sheet metal for the manufacture of laminated cores for static or dynamic electromagnetic devices |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1503476A1 (en) * | 2002-05-08 | 2005-02-02 | Daikin Industries, Ltd. | Electric motor and compressor |
| EP1503476A4 (en) * | 2002-05-08 | 2007-01-24 | Daikin Ind Ltd | Electric motor and compressor |
| FR2888390A1 (en) * | 2005-07-08 | 2007-01-12 | Cnes Epic | METHOD FOR MANUFACTURING MAGNETIC LAMINATE CIRCUIT |
| WO2007006965A1 (en) * | 2005-07-08 | 2007-01-18 | Centre National D'etudes Spatiales | Method for making a laminated magnetic circuit |
| DE102011079843A1 (en) * | 2011-07-26 | 2013-01-31 | Siemens Aktiengesellschaft | Electric machine with low-mass design in magnetically active parts |
| US9543064B2 (en) | 2011-07-26 | 2017-01-10 | Siemens Aktiengesellschaft | Electric machine having a low-mass design in magnetically active parts |
| WO2014009182A1 (en) * | 2012-07-12 | 2014-01-16 | Hella Kgaa Hueck & Co. | Transformer for storing and filtering |
Also Published As
| Publication number | Publication date |
|---|---|
| CA2106110A1 (en) | 1994-03-23 |
| GB9318991D0 (en) | 1993-10-27 |
| DE4331787A1 (en) | 1994-04-21 |
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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) |