EP3776822A1 - Kurzschlussring und kurzschlussläufer für eine asynchronmaschine - Google Patents
Kurzschlussring und kurzschlussläufer für eine asynchronmaschineInfo
- Publication number
- EP3776822A1 EP3776822A1 EP18717505.4A EP18717505A EP3776822A1 EP 3776822 A1 EP3776822 A1 EP 3776822A1 EP 18717505 A EP18717505 A EP 18717505A EP 3776822 A1 EP3776822 A1 EP 3776822A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- ring
- short
- rotor
- circuit
- asynchronous machine
- 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.)
- Pending
Links
- 239000000463 material Substances 0.000 claims abstract description 64
- 239000007769 metal material Substances 0.000 claims abstract description 14
- 238000007747 plating Methods 0.000 claims abstract description 9
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 8
- 229910052802 copper Inorganic materials 0.000 claims description 8
- 239000010949 copper Substances 0.000 claims description 8
- 229910052782 aluminium Inorganic materials 0.000 claims description 7
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 7
- 238000003475 lamination Methods 0.000 claims description 7
- 241000555745 Sciuridae Species 0.000 claims description 6
- 229910000881 Cu alloy Inorganic materials 0.000 claims description 5
- 229910000838 Al alloy Inorganic materials 0.000 claims description 2
- 239000002131 composite material Substances 0.000 description 8
- 238000003466 welding Methods 0.000 description 7
- 238000002844 melting Methods 0.000 description 5
- 230000008018 melting Effects 0.000 description 5
- 229910045601 alloy Inorganic materials 0.000 description 3
- 239000000956 alloy Substances 0.000 description 3
- 238000011161 development Methods 0.000 description 2
- 230000018109 developmental process Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 239000010953 base metal Substances 0.000 description 1
- 239000004035 construction material Substances 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 230000012447 hatching Effects 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 239000011265 semifinished product Substances 0.000 description 1
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
- H02K15/0012—Manufacturing cage rotors
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K17/00—Asynchronous induction motors; Asynchronous induction generators
- H02K17/02—Asynchronous induction motors
- H02K17/16—Asynchronous induction motors having rotors with internally short-circuited windings, e.g. cage rotors
- H02K17/168—Asynchronous induction motors having rotors with internally short-circuited windings, e.g. cage rotors having single-cage rotors
Definitions
- the invention relates to a short-circuit ring for an asynchronous machine and a squirrel-cage rotor for an asynchronous machine.
- a rotor cage of an asynchronous machine the ends of the
- Rotor bars are electrically connected to the short circuit rings.
- the quality of the connection and its reliability is of great importance for the performance and efficiency of the asynchronous machine.
- a cohesive connection is generally to be preferred.
- the connection of the rotor bars with the short circuit rings can be effected by welding.
- the rotor bars are preferably made of copper or a copper alloy.
- the shorting rings may also be copper or a copper alloy, or alternatively another material such as aluminum. Since the melting points of copper materials and aluminum materials differ significantly, the welding of copper materials with aluminum materials is difficult. The welding of similar materials, however, is less difficult.
- the use of identical materials for rotor bars and short-circuit rings limits the optimization possibilities in the design of squirrel-cage rotors. Not only performance and efficiency are important, but also the weight and the costs of material and production of an asynchronous machine play an important role.
- the invention is therefore based on the object to provide a short-circuit ring for an asynchronous, which is inexpensive and can be reliably welded to the ends of the rotor bars of the asynchronous machine.
- the invention includes a shorting ring for an asynchronous machine, wherein the shorting ring comprises a ring of a first metallic material.
- a support made of a second metallic material is applied by plating on the radially outer circumferential surface of the ring over its entire circumference.
- the invention is based on the consideration that the ends of the
- Rotor bars can be welded particularly well with a short-circuit ring, if the same material or at least one material from the same family of materials is present on the outer circumference of the short-circuit ring as the material from which the rotor bars are formed. This equality or at least similarity of the materials is achieved by a support of a second material is applied to a short-circuit ring, which is formed of any first metallic material on the outer circumference and this second material of the same family of materials as the material Rotor bars is selected. Ideally, the material of the edition of
- Shorting ring and the material of the rotor bars identical. However, it is also possible to use two different alloys of the same base metal, provided that the melting ranges of the two alloys do not differ significantly.
- An inventive short-circuit ring thus represents a composite material of two different metallic materials. The composite material is formed so that the first material forms an inner ring which is connected at its outer periphery with an outer ring made of a second material.
- Such a composite short-circuit ring can be made by applying to a first metallic strip of a first material by a
- a second metallic strip of a second material is applied.
- the second strip then forms a support on the first strip.
- a strip-shaped composite material of different materials is formed.
- the composite material is then bent into a ring in such a way that the second strip forms the radially outer layer of the ring.
- the two ends of the 360 ° bent strip are preferably joined together by welding, so that a closed ring is formed.
- a short-circuit ring is formed which comprises an inner ring made of a first metallic material and a bearing made of a second metallic material applied over the entire circumference of this inner ring.
- Such a short-circuit ring is a bi-metallic ring in the radial direction.
- Rotor bars can be selected. He can be chosen so that the
- the short-circuiting ring has on its outer periphery a material which provides optimum conditions for welding to the ends of the rotor bars.
- the short-circuit ring can thus be easily and reliably connected to the rotor bars. This allows a
- Short-circuit ring of the type described a great flexibility in terms of material selection while excellent conditions for a good electrically conductive connection with the rotor bars.
- the shorting ring is made of a plated band. Clad strips can be provided cheaply and in high quality as semi-finished products. Plating processes, such as laser roll plating, enable the production of composite materials in which the thickness of the individual
- Material strip can be varied within wide ranges.
- the thickness of the ring of the first material may be at least twice as large as the thickness of the support of the second material.
- the thickness of the ring of the first material may be at least three times as large as the thickness of the support of the second material.
- the first material may be aluminum or an aluminum alloy.
- Aluminum-based materials are characterized by high electrical conductivity and low weight. Furthermore, aluminum is a low cost material that is easy to work with. Thus, these materials provide an ideal construction material for
- the second material may be copper or a copper alloy. Due to their very high electrical conductivity, copper-based materials are the preferred materials for the rotor bars in asynchronous machines.
- copper-based materials are the preferred materials for the rotor bars in asynchronous machines.
- the overlay on the outer circumference of the shorting ring is made of copper or a copper alloy, material uniformity can be achieved between the outer surface of the shorting ring and the rotor bars, or at least similar in material. Thus, very good conditions for a welded connection between short-circuit ring and Rotor bars before.
- the squirrel-cage rotor comprises a rotor core, which has a plurality of recesses, and a rotor cage of short-circuit rings attached to the rotor core and electrically conductive rotor bars which are inserted into the recesses of the rotor core so that the rotor bars protrude at their end regions have the rotor laminations.
- the short-circuit rings each have a ring made of a first metallic material.
- a support made of a second metallic material is applied by plating on the radially outer circumferential surface of the ring over its entire circumference.
- the rotor bars are formed of a material which is similar to the material of the support of the short-circuit rings, and the
- End areas of the rotor bars are with the overlay of the shorting rings
- Short-circuit rotor with short-circuit rings according to the invention and rotor bars which are formed from a same material as the support on the outer circumference of the short-circuit rings, characterized by a high flexibility in terms of material selection and an excellent connection between the shorting rings and the rotor bars.
- Identical in this context means that the two materials come from the same family of materials. This ensures that the melting temperatures of the two materials are not far apart. For alloys that have a certain melting interval, the melting intervals of the two materials should at least overlap.
- Fig. 1 is a plated band
- Fig. 2 is a short-circuit ring
- Fig. 3 shows a squirrel cage rotor with short circuit rings in longitudinal section
- Fig. 1 shows a clad strip 8.
- the strip 8 has a first metallic strip 81 to which a second metallic strip 82 is applied by plating.
- the band 8 represents a composite material.
- the short-circuit ring 1 has an inner ring 2 made of a first material. On the outer circumference of the ring 2, a support 3 is applied from a second material. The support 3 thus forms a concentric with the inner ring 2 arranged outer ring.
- the short-circuit ring 1 is made of a plated band 8 shown in FIG. For this purpose, the band 8 is bent annularly. From the first metallic strip 81 of the plated strip, the inner ring 2 of the
- Short circuit ring 1 is formed, while from the second metallic strip 82 of the plated strip, the support 3 of the short-circuit ring 1 is formed.
- the short-circuit ring 1 represents a composite short-circuit ring.
- the plated band 8 is bent 360 ° so that its two ends abut each other. The two ends are welded so that one
- Closed short-circuit ring 1 is formed, which has a seam 11.
- FIG. 3 shows a longitudinal section of a squirrel-cage rotor 4 with two short-circuit rings 1 according to FIG. 2.
- the axis of the squirrel-cage rotor 4 is designated A.
- the squirrel-cage rotor 4 has a rotor core 5 with recesses. In the recesses of the rotor core 5 rotor blades 6 are introduced, of which in Fig. 3, only one is shown.
- the end regions 61 of the rotor bars 6 protrude beyond the end faces of the rotor core 5.
- the squirrel cage rotor 4 has two short-circuit rings 1.
- Short circuit rings 1 each have a ring 2 and a support 3.
- the material of the support 3 is equal to the material of the rotor bars 6. This is illustrated by the same hatching of these parts.
- the short-circuit rings 1 are each attached to the end of the rotor laminations 5.
- the short-circuit rings 1 are dimensioned such that they adjoin with their outer circumference the radially inwardly directed surface of the end regions 61 of the rotor bars 6.
- the overlay 3 of the short-circuit rings 1 is thus located directly next to the material-identical end regions 61 of the rotor bars 6.
- the welding can be done in the axial or in the radial direction.
- the weld seam 7 preferably extends as far as the end face of the rotor core 5.
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Induction Machinery (AREA)
Abstract
Description
Claims
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PCT/EP2018/000159 WO2019192665A1 (de) | 2018-04-04 | 2018-04-04 | Kurzschlussring und kurzschlussläufer für eine asynchronmaschine |
Publications (1)
Publication Number | Publication Date |
---|---|
EP3776822A1 true EP3776822A1 (de) | 2021-02-17 |
Family
ID=61972073
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP18717505.4A Pending EP3776822A1 (de) | 2018-04-04 | 2018-04-04 | Kurzschlussring und kurzschlussläufer für eine asynchronmaschine |
Country Status (2)
Country | Link |
---|---|
EP (1) | EP3776822A1 (de) |
WO (1) | WO2019192665A1 (de) |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3517238A (en) * | 1968-04-04 | 1970-06-23 | Gen Electric | Squirrel cage rotor and method of building the same |
US8701270B2 (en) * | 2010-01-21 | 2014-04-22 | GM Global Technology Operations LLC | Methods of manufacturing induction rotors with conductor bars having high conductivity |
JP5155420B2 (ja) * | 2011-03-11 | 2013-03-06 | ファナック株式会社 | エンドリングとバーをろう付けする誘導電動機のかご形ロータ及びその製造方法 |
US20120228272A1 (en) | 2011-03-11 | 2012-09-13 | GM Global Technology Operations LLC | Welding apparatus for induction motor and method of welding induction motor |
DE102015224577A1 (de) * | 2015-12-08 | 2017-06-08 | Bayerische Motoren Werke Aktiengesellschaft | Rotor, Verfahren zum Herstellen eines Rotors, Asynchronmaschine und Fahrzeug |
-
2018
- 2018-04-04 WO PCT/EP2018/000159 patent/WO2019192665A1/de unknown
- 2018-04-04 EP EP18717505.4A patent/EP3776822A1/de active Pending
Also Published As
Publication number | Publication date |
---|---|
WO2019192665A1 (de) | 2019-10-10 |
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