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FI128259B - A rotor of an induction machine and a method for assembling a cage winding of the rotor - Google Patents

A rotor of an induction machine and a method for assembling a cage winding of the rotor Download PDF

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Publication number
FI128259B
FI128259B FI20175678A FI20175678A FI128259B FI 128259 B FI128259 B FI 128259B FI 20175678 A FI20175678 A FI 20175678A FI 20175678 A FI20175678 A FI 20175678A FI 128259 B FI128259 B FI 128259B
Authority
FI
Finland
Prior art keywords
rotor
rings
longer
core structure
conductor bars
Prior art date
Application number
FI20175678A
Other languages
Finnish (fi)
Swedish (sv)
Other versions
FI20175678A1 (en
Inventor
Matti Nikkinen
Michiel Bosch
Original Assignee
The Switch Drive Systems Oy
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by The Switch Drive Systems Oy filed Critical The Switch Drive Systems Oy
Priority to FI20175678A priority Critical patent/FI128259B/en
Priority to PCT/FI2018/050393 priority patent/WO2019012178A1/en
Publication of FI20175678A1 publication Critical patent/FI20175678A1/en
Application granted granted Critical
Publication of FI128259B publication Critical patent/FI128259B/en

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Classifications

    • 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
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K15/00—Processes or apparatus specially adapted for manufacturing, assembling, maintaining or repairing of dynamo-electric machines
    • H02K15/02—Processes 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
    • H02K17/00—Asynchronous induction motors; Asynchronous induction generators
    • 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
    • H02K17/20—Asynchronous induction motors having rotors with internally short-circuited windings, e.g. cage rotors having deep-bar rotors
    • 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
    • H02K3/12—Windings characterised by the conductor shape, form or construction, e.g. with bar conductors arranged in slots
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K3/00—Details of windings
    • H02K3/46—Fastening of windings on the stator or rotor structure
    • H02K3/50—Fastening of winding heads, equalising connectors, or connections thereto
    • H02K3/505—Fastening of winding heads, equalising connectors, or connections thereto for large machine windings, e.g. bar windings
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K3/00—Details of windings
    • H02K3/46—Fastening of windings on the stator or rotor structure
    • H02K3/50—Fastening of winding heads, equalising connectors, or connections thereto
    • H02K3/51—Fastening of winding heads, equalising connectors, or connections thereto applicable to rotors only

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Manufacture Of Motors, Generators (AREA)

Abstract

A rotor of an induction machine comprises a rotor core structure (102) and a cage winding. The cage winding comprises conductor bars (103, 104) and end-ring structures at ends of the cage winding. Each end-ring structure comprises axially successive first and second end-rings (105, 106, 107, 108). The ends of the conductor bars are arranged to protrude axially out from the rotor core structure so that longer ones of the ends protrude a longer distance than shorter ones of the ends. The longer ends protrude through openings of the first end-rings and through openings of the second end-rings and are attached to the second end-rings, whereas the shorter ends protrude through openings of the first end-rings only and are attached to the first end-rings. Thus, reliable mechanical attachments can be made between the conductor bars and both of the first and second endrings.

Description

A rotor of an induction machine and a method for assembling a cage winding of the rotor
Field of the technology
The disclosure relates generally to rotating electric machines. More particularly, the disclosure relates to a rotor of an induction machine. Furthermore, the disclosure relates to an induction machine and to a method for assembling a cage winding of a rotor of an induction machine.
Background
Rotating electric machines, such as motors and generators, generally comprise a stator and a rotor which are arranged so that a magnetic flux is developed between these two. A rotor of an induction machine comprises typically a rotor core structure, a shaft, and a cage winding. The cage winding comprises conductor bars and endrings. The conductor bars are located in slots of the rotor core structure. The end15 rings are connected to the ends of the conductor bars at the end-regions of the rotor core structure. The rotor core structure is typically a laminated structure composed of ferromagnetic steel sheets which are electrically insulated from each other and which are stacked in the axial direction of the rotor. However, especially in many high-speed induction machines, a rotor core structure is made of solid steel. The 20 rotor core structure made of solid steel may constitute, together with the shaft of the rotor, a single piece of solid steel.
In many induction machines, the conductor bars and the end-rings are manufactured as separate pieces of electrically conductive material and the endrings are attached to the ends of the conductor bars with electrically conductive 25 joints. The material of the conductor bars and of the end-rings can be for example copper or aluminum. The conductor bars can be attached to the end-rings for example by soldering, welding, brazing, or clenching the ends of the conductor bars axially to form tight fits with walls of openings of the end-rings through which the conductor bars are protruding. In order to obtain desired electrical properties, the 30 axial thickness of end-rings needs to be in many cases from 40 mm to 60 mm. The
20175678 prh 19-12-2019 required axial thickness may cause challenges in availability of material pieces suitable for making the end-rings, in costs of the material pieces, and/or in the manufacturing process of the end-rings.
The publication US2011080067 describes an end-ring structure which comprises two axially successive end-rings at both ends of a cage winding. This approach facilitates the manufacture of the end-rings because each end-ring is thinner in the axial direction. Furthermore, suitable material pieces are available more easily and with lower costs. This approach is however not free from challenges. One of the challenges is that end-rings which are axially closer to a rotor core structure may be 10 difficult to attach to conductor bars and thus these end-rings may get mechanically loose due to for example temperature variations and differences in thermal expansion coefficients of materials of a rotor.
Summary
The following presents a simplified summary in order to provide a basic 15 understanding of some embodiments of the invention. The summary is not an extensive overview of the invention. It is neither intended to identify key or critical elements of the invention nor to delineate the scope of the invention. The following summary merely presents some concepts of the invention in a simplified form as a prelude to a more detailed description of exemplifying embodiments of the invention.
In this document, the word “geometric” when used as a prefix means a geometric concept that is not necessarily a part of any physical object. The geometric concept can be for example a geometric point, a straight or curved geometric line, a geometric plane, a non-planar geometric surface, a geometric space, or any other geometric entity that is zero, one, two, or three dimensional.
In accordance with the invention, there is provided a new rotor for an induction machine. A rotor according to the invention comprises:
- a rotor core structure, a plurality of conductor bars in slots of the rotor core structure, and
20175678 prh 19-12-2019
- two end-ring structures electrically connecting ends of the conductor bars to each other at both ends of a cage winding constituted by the conductor bars and the end-ring structures, each of the end-ring structures comprising a first end-ring and a second end-ring axially successive to each other.
The conductor bars are located in the slots of the rotor core structure so that, at each end of the cage winding, ends of the conductor bars protrude axially out from the rotor core structure so that longer ones of the ends protrude axially a longer distance than shorter ones of the ends. The longer ends of the conductor bars protrude through first openings of the first end-rings and through openings of the 10 second end-rings and are attached to the second end-rings, whereas the shorter ends of the conductor bars protrude through second openings of the first end-rings without protruding through the second end-rings. The shorter ends of the conductor bars are attached to the first end-rings.
As the shorter ends of the conductor bars are attached to the first end-rings, the risk 15 that the first end-rings get mechanically loose, e.g. due to temperature variations, is reduced.
In accordance with the invention, there is provided also a new induction machine. An induction machine according to the invention comprises:
- a stator comprising stator windings, and
- a rotor according to the invention, the rotor being rotatably supported with respect to the stator.
In accordance with the invention, there is provided also a new method for assembling a cage winding of a rotor of an induction machine. A method according to the invention comprises:
- placing conductor bars into slots of a rotor core structure so that, at each end of the rotor core structure, ends of the conductor bars protrude axially out from the rotor core structure so that longer ones of the ends protrude axially a longer distance than shorter ones of the ends,
20175678 prh 19-12-2019
- placing first end-rings so that the shorter and longer ends of the conductor bars protrude through openings of the first end-rings,
- attaching the shorter ends of the conductor bars to the first end-rings,
- placing second end-rings so that only the longer ends of the conductor bars protrude through openings of the second end-rings, and
- attaching the longer ends of the conductor bars to the second end-rings.
Exemplifying and non-limiting embodiments of the invention are described in accompanied dependent claims.
Various exemplifying and non-limiting embodiments of the invention both as to 10 constructions and to methods of operation, together with additional objects and advantages thereof, will be best understood from the following description of specific exemplifying embodiments when read in conjunction with the accompanying drawings.
The verbs “to comprise” and “to include” are used in this document as open 15 limitations that neither exclude nor require the existence of also un-recited features.
The features recited in dependent claims are mutually freely combinable unless otherwise explicitly stated. Furthermore, it is to be understood that the use of a or an, i.e. a singular form, throughout this document does not exclude a plurality.
Brief description of the figures
Exemplifying and non-limiting embodiments of the invention and their advantages are explained in greater detail below in the sense of examples and with reference to the accompanying drawings, in which:
figures 1a, 1b, 1c, and 1d illustrate a rotor according to an exemplifying and nonlimiting embodiment of the invention, figures 2a and 2b illustrate a detail of a rotor according to an exemplifying and nonlimiting embodiment of the invention,
20175678 prh 19-12-2019 figure 3 illustrates an electric machine according to an exemplifying and non-limiting embodiment of the invention, and figure 4 shows a flowchart of a method according to an exemplifying and non-limiting embodiment of the invention for assembling a cage winding of a rotor of an induction 5 machine.
Description of exemplifying and non-limiting embodiments
The specific examples provided in the description given below should not be construed as limiting the scope and/or the applicability of the appended claims. Furthermore, it is to be understood that lists and groups of examples provided in the 10 description given below are not exhaustive unless otherwise explicitly stated.
Figures 1a, 1b, and 1c show section views of a rotor 101 according to an exemplifying and non-limiting embodiment of the invention. The section shown in figure 1a is taken along a geometric fraction line A-A shown in figures 1b and 1c, and the geometric section surface is perpendicular to the xy-plane of a coordinate 15 system 199. The section shown in figure 1b is taken along a geometric line B1-B1 shown in figure 1a, and the geometric section plane is parallel with the xy-plane of the coordinate system 199. The section shown in figure 1c is taken along a geometric line B2-B2 shown in figure 1a, and the geometric section plane is parallel with the xy-plane of the coordinate system 199. The rotor 101 comprises a rotor 20 core structure 102. In this exemplifying case, the rotor core structure 102 is made of solid ferromagnetic steel and the rotor core structure and a shaft 114 of the rotor constitute a single piece of solid steel. It is, however, also possible that a rotor according to an exemplifying and non-limiting embodiment comprises a rotor core structure that comprises a stack of ferromagnetic steel sheets so that the 25 ferromagnetic steel sheets are electrically insulated from each other and stacked on each other in the axial direction of the rotor.
The rotor 101 comprises a cage winding that comprises a plurality of conductor bars located in slots of the ferromagnetic core structure 102. In figures 1 a and 1 b, two of the conductor bars are denoted with references 103 and 104. In this exemplifying 30 case, the slots of the rotor core structure are open slots having slot openings on the
20175678 prh 19-12-2019 airgap surface of the rotor core structure 102. It is, however, also possible that a rotor according to an exemplifying and non-limiting embodiment comprises a rotor core structure that comprises closed slots. The cage winding comprises two endring structures 115 and 116. The end-ring structure 115 connects ends of the 5 conductor bars electrically to each other at a first end of the rotor core structure 102.
Correspondingly, the end-ring structure 116 connects ends of the conductor bars electrically to each other at the second end of rotor core structure 102. The end-ring structure 115 comprises a first end-ring 105 and a second end-ring 106 which are axially successive to each other and in contact with each other. Correspondingly, 10 the end-ring structure 116 comprises an end-ring 107 and an end-ring 108 which are axially successive to each other and in contact with each other.
The conductor bars are located in the slots of the rotor core structure 102 so that, at each end of the rotor core structure, ends of the conductor bars protrude axially out from the rotor core structure so that longer ones of the ends protrude axially a 15 longer distance than shorter ones of the ends. As illustrated in figure 1a, the conductor bar 103 has its longer end at the first end of the rotor core structure and its shorter end at the second end of the rotor core structure, whereas the conductor bar 104 has its shorter end at the first end of the rotor core structure and its longer end at the second end of the rotor core structure. The longer ends of the conductor 20 bars protrude through first openings of the end-rings 105 and 107 and through openings of the end-rings 106 and 108. The longer ends are attached to the endrings 106 and 108. The shorter ends of the conductor bars protrude through second openings of the end-rings 105 and 107 without protruding through the end-rings 106 and 108. The shorter ends are attached to the end-rings 105 and 107. As illustrated 25 in figures 1a and 1c, the end-ring 106 has openings for the longer ends only.
Correspondingly, the end-ring 108 has openings for the longer ends only. As the shorter ends of the conductor bars are attached to the end-rings 105 and 107, the risk that the end-rings 105 and 107 get mechanically loose, e.g. due to temperature variations, is reduced. In this exemplifying case, the openings of the end-rings 10530 108 are apertures so that the end-rings are capable of radially supporting the ends of the conductor bars. It is, however, also possible that the openings are slots on
20175678 prh 19-12-2019 the outer circumferences of the end-rings or on the inner circumferences of the endrings.
The shorter ends of the conductor bars can be attached to the end-rings 105 and 107 for example so that the shorter ends are axially clenched to form tight fits with walls of the openings of the end-rings 105 and 106. Correspondingly, the longer ends of the conductor bars can be attached to the end-rings 106 and 108 for example so that the longer ends are axially clenched to form tight fits with walls of the openings of the end-rings 106 and 108. It is, however, also possible that the ends of the conductor bars are attached to the end-ring structures by soldering, brazing, or welding.
In the exemplifying rotor 101 illustrated in figures 1a-1c, the conductor bars are arranged so that, at each end of the cage winding, every second end of the conductor bars is a longer end and every second end is correspondingly a shorter end. In other words, at each end of the cage winding, there is between adjacent ones of the shorter ends of the conductor bars one of the longer ends of the conductor bars, and between adjacent ones of the longer ends of the conductor bars one of the shorter ends of the conductor bars.
In the exemplifying rotor 101 illustrated in figures 1a-1c, each of the conductor bars comprises a first end-portion, a middle-portion, and a second end-portion so that the middle-portion is wider in a radial direction than the first and second end-portions and the first end-portion is axially longer than the second end-portion. Figure 1d shows the conductor bars 103 and 104 separately from the other parts of the rotor 101. In figure 1 d, the first end-portion of the conductor bar 103 is denoted with a reference 109, the middle-portion of the conductor bar 103 is denoted with a reference 110, and the second end-portion of the conductor bar 103 is denoted with a reference 111. The conductor bars are located in the slots of the rotor core structure so that the first end-portions constitute the longer ends of the conductor bars and the second end-portions constitute the shorter ends of the conductor bars. As can be understood based on figures 1 a and 1 d, the conductor bars can be similar to each other but adjacent conductor bars are oppositely directed in the slots of the rotor core structure.
20175678 prh 19-12-2019
The end-ring structure 115 may further comprise an electrically conductive layer that is between the end-rings 105 and 106 and in contact with the end-rings 105 and 106. Correspondingly, the end-ring structure 116 may comprise an electrically conductive layer that is between the end-rings 107 and 108 and in contact with the 5 end-rings 107 and 108. The material of the electrically conductive layers is advantageously different from the material of the end-rings. The material of each electrically conductive layer can be for example tin or other material having a high electrical conductivity so as to ensure a good galvanic contact between the endrings of each end-ring structure. The electrically conductive layer can be for example 10 a coating of tin on an axially facing surface of an end-ring. It is also possible that the electrically conductive layer is constituted by two coatings on axially facing surfaces of the end-rings.
Figures 2a and 2b illustrate a detail of a rotor according to an exemplifying and nonlimiting embodiment of the invention. Figure 2a shows a section taken along a 15 geometric line A-A shown in figure 2b. The geometric section plane relating to figure
2a is parallel with the yz-plane of a coordinate system 299. Figure 2b shows a section taken along a geometric line B-B shown in figure 2a. The geometric section plane relating to figure 2b is parallel with the xy-plane of the coordinate system 299. The axial direction of the rotor is parallel with the z-axis of the coordinate system 20 299. In this exemplifying case, the rotor comprises wedges at the openings of the slots of the rotor core structure 202 so that the conductor bars are radially between the wedges and the bottoms of the slots of the rotor core structure. The wedges are arranged to radially support the conductor bars. In figures 2a and 2b, one of the wedges is denoted with a reference 212 and one of the conductor bars is denoted 25 with a reference 203. Axially successive end-rings of one of the end-ring structures are denoted with references 205 and 206. The wedges can be made of for example electrically conductive and/or non-magnetic material such as e.g. copper or brass.
Figure 3 illustrates an induction machine according to an exemplifying and nonlimiting embodiment of the invention. The induction machine comprises a rotor 301 30 according to an embodiment of the invention and a stator 302. The rotor 301 is rotatably supported with respect to the stator 302. Arrangements for rotatably supporting the rotor 301 with respect to the stator 302 are not shown in figure 3. The
20175678 prh 19-12-2019 stator 302 comprises stator windings 313 for generating a rotating magnetic field in response to being supplied with alternating currents. The stator windings 313 can be for example a three-phase winding. The rotor 301 can be for example such as illustrated in figures 1a-1d or such as illustrated in figures 2a and 2b.
Figure 4 shows a flowchart of a method according to an exemplifying and nonlimiting embodiment of the invention for assembling a cage winding of a rotor of an induction machine. The method comprises the following actions:
- action 401: placing conductor bars into slots of a rotor core structure so that, at each end of the rotor core structure, ends of the conductor bars protrude axially out from the rotor core structure so that longer ones of the ends protrude axially a longer distance than shorter ones of the ends,
- action 402: placing first end-rings so that the shorter and longer ends of the conductor bars protrude through openings of the first end-rings,
- action 403: attaching the shorter ends of the conductor bars to the first end- rings,
- action 404: placing second end-rings so that only the longer ends of the conductor bars protrude through openings of the second end-rings, and
- action 405: attaching the longer ends of the conductor bars to the second end-rings.
In a method according to an exemplifying and non-limiting embodiment of the invention, the conductor bars are placed into the slots of the rotor core structure so that, at each end of the rotor core structure, there is between adjacent ones of the shorter ends of the conductor bars one of the longer ends of the conductor bars, and between adjacent ones of the longer ends of the conductor bars one of the 25 shorter ends of the conductor bars.
In a method according to an exemplifying and non-limiting embodiment of the invention, each of the conductor bars comprises a first end-portion, a middle-portion, and a second end-portion so that the middle-portion is wider in a radial direction than the first and second end-portions and the first end-portion is axially longer than the second end-portion. The conductor bars are placed in the slots of the rotor core structure so that the first end-portions constitute the longer ends of the conductor bars and the second end-portions constitute the shorter ends of the conductor bars.
In a method according to an exemplifying and non-limiting embodiment of the invention, the shorter ends of the conductor bars are attached to the first end-rings by clenching the shorter ends axially to form tight fits with walls of the openings of the first end-rings, and the longer ends of the conductor bars are attached to the second end-rings by clenching the longer ends axially to form tight fits with walls of 10 the openings of the second end-rings. It is also possible that the ends of the conductor bars are attached to the end-ring structures by soldering, brazing, or welding.
The specific examples provided in the description given above should not be construed as limiting the scope and/or the applicability of the appended claims. Lists 15 and groups of examples provided in the description given above are not exhaustive unless otherwise explicitly stated.

Claims (12)

PatenttivaatimuksetThe claims 1. Roottori (101, 301) induktiokonetta varten, joka roottori käsittää:A rotor (101, 301) for an induction machine, the rotor comprising: - roottorin sydänrakenteen (102),- a rotor core structure (102), - joukon johdintankoja (103, 104, 203) roottorin sydänrakenteen urissa, jaa plurality of guide rods (103, 104, 203) in the grooves of the rotor core structure, and 5 - kaksi päätyrengasrakennetta (115, 116), jotka liittävät sähköisesti johdintankojen päät toisiinsa johdintankojen ja päätyrengasrakenteiden muodostaman häkkikäämityksen molemmissa päissä, kunkin päätyrengasrakenteista käsittäessä ensimmäisen päätyrenkaan (105, 107) ja toisen päätyrenkaan (106, 108) aksiaalisesti peräkkäin toistensa kanssa,5 - two end ring structures (115, 116) electrically connecting the ends of the wire rods to each end of the cage winding formed by the wire rods and end ring structures, each end ring structure comprising the first end ring (105, 107) and the second end ring (106, 108) 10 tunnettu siitä, että:10 characterized in that: - johdintangot sijaitsevat roottorin sydänrakenteen urissa siten, että johdintankojen päät ulkonevat häkkikäämityksen kussakin päässä aksiaalisesti roottorin sydänrakenteesta siten, että pidemmät päistä ulkonevat aksiaalisesti pidemmän matkan kuin lyhyemmät päistä,- the guide rods are located in the grooves of the rotor core structure such that the ends of the guide rods project axially at each end of the cage winding from the core structure of the rotor such that the longer ends protrude axially longer than the shorter ends, 15 - pidemmät johdintankojen päistä työntyvät ensimmäisten päätyrenkaiden (105, 107) ensimmäisten aukkojen läpi ja toisten päätyrenkaiden (106, 108) aukkojen läpi ja ovat kiinnitettyjä toisiin päätyrenkaisiin, ja15 - longer at the ends of the wire rods projecting through the first openings of the first end rings (105, 107) and through the openings of the second end rings (106, 108) and secured to the second end rings, and - lyhyemmät johdintankojen päistä työntyvät ensimmäisten päätyrenkaiden (105, 107) toisten aukkojen läpi työntymättä toisten päätyrenkaiden läpi ja- the shorter ends of the wire rods project through the second openings of the first end rings (105, 107) without projecting through the second end rings, and 20 ovat kiinnitettyjä ensimmäisiin päätyrenkaisiin.20 are secured to the first end rings. 2. Patenttivaatimuksen 1 mukainen roottori, jossa häkkikäämityksen kussakin päässä on johdintankojen lyhyemmistä päistä vierekkäisten lyhyempien päiden välissä yksi johdintankojen pidemmistä päistä, ja johdintankojen pidemmistä päistä vierekkäisten pidempien päiden välissä on yksi johdintankojen lyhyemmistä päistä.The rotor of claim 1, wherein at each end of the cage winding there is one of the longer ends of the wire rods between adjacent shorter ends and one of the shorter ends of the wire rods between adjacent longer ends of the wire rods. 25 3. Patenttivaatimuksen 1 tai 2 mukainen roottori, jossa kukin johdintangoista käsittää ensimmäisen päätyosion (109), keskiosion (110) ja toisen päätyosion (111) siten, että keskiosio on leveämpi radiaalisessa suunnassa kuin ensimmäinen ja A rotor according to claim 1 or 2, wherein each of the conductor bars comprises a first end portion (109), a middle portion (110) and a second end portion (111) such that the middle portion is wider in the radial direction than the first and 20175678 prh 28 -05- 2018 toinen päätyosio, ja ensimmäinen päätyosio on aksiaalisesti pidempi kuin toinen päätyosio, ja johdintangot sijaitsevat roottorin sydänrakenteen urissa siten, että ensimmäiset päätyosiot muodostavat pidemmät johdintankojen päistä, ja toiset päätyosiot muodostavat lyhyemmät johdintankojen päistä.20175678 prh 28 -05-2018 the second end portion and the first end portion are axially longer than the second end portion, and the conductor bars are located in the grooves of the rotor core structure such that the first end portions are longer at the end of the wire bars. 5 4. Jonkin patenttivaatimuksista 1 - 3 mukainen roottori, jossa johdintankojen lyhyemmät päät ovat aksiaalisesti tyssättyjä niiden sovittamiseksi tiukasti ensimmäisten päätyrenkaiden aukkojen seinämiin, ja johdintankojen pidemmät päät ovat aksiaalisesti tyssättyjä niiden sovittamiseksi tiukasti toisten päätyrenkaiden aukkojen seinämiin.A rotor according to any one of claims 1 to 3, wherein the shorter ends of the conductor bars are axially embedded to fit snugly into the walls of the first end ring apertures, and the longer ends of the conductor bars are axially embedded to fit snugly into the walls of the second end ring apertures. 10 5. Jonkin patenttivaatimuksista 1 - 3 mukainen roottori, jossa johdintankojen lyhyemmät päät on kiinnitetty ensimmäisiin päätyrenkaisiin, ja johdintankojen pidemmät päät on kiinnitetty toisiin päätyrenkaisiin kiinnitystekniikalla, joka on valittu seuraavista: pehmeäjuotos, kovajuotos, hitsaus.The rotor of any one of claims 1 to 3, wherein the shorter ends of the wire rods are secured to the first end rings, and the longer ends of the wire rods are secured to the second end rings by a fastening technique selected from soft soldering, brazing, welding. 6. Jonkin patenttivaatimuksista 1 - 4 mukainen roottori, jossa roottorin 15 sydänrakenteen urat ovat avoimia uria, joilla on ura-aukot roottorin sydänrakenteen ilmavälipinnalla.The rotor according to any one of claims 1 to 4, wherein the grooves of the core structure of the rotor 15 are open grooves having grooves in the air gap surface of the core structure of the rotor. 7. Patenttivaatimuksen 5 mukainen roottori, jolloin roottori käsittää lisäksi kiilat (212) roottorin sydänrakenteen urien aukoissa siten, että johdintangot (203) ovat radiaalisesti kiilojen ja roottorin sydänrakenteen urien pohjien välissä.The rotor of claim 5, wherein the rotor further comprises wedges (212) in the apertures of the rotor core structure grooves such that the conductor rods (203) are radially between the wedges and the bottom of the rotor core structure grooves. 2020 8. Jonkin patenttivaatimuksista 1 - 7 mukainen roottori, jossa ensimmäisten ja toisten päätyrenkaiden (105 - 108) aukot ovat ensimmäisten ja toisten päätyrenkaiden reikiä johdintankojen päiden tukemiseksi radiaalisesti.A rotor according to any one of claims 1 to 7, wherein the openings of the first and second end rings (105-108) are holes in the first and second end rings for radially supporting the ends of the wire rods. 9. Jonkin patenttivaatimuksista 1 - 8 mukainen roottori, jossa kukin päätyrengasrakenteista (115, 116) käsittää sähköäjohtavan kerroksenA rotor according to any one of claims 1 to 8, wherein each of the end-ring structures (115, 116) comprises an electrically conductive layer 25 ensimmäisen ja toisen päätyrenkaan välissä sekä kosketuksessa ensimmäiseen ja toiseen päätyrenkaaseen, jonka sähköäjohtavan kerroksen materiaali on eri kuin ensimmäisen ja toisen päätyrenkaan materiaali.Between the first and second end rings and in contact with the first and second end rings having a conductive layer material different from that of the first and second end rings. 10. Induktiokone, joka käsittääAn induction machine comprising: 20175678 prh 28 -05- 201820175678 prh 28 -05- 2018 - staattorin (302), joka käsittää staattorin käämitykset (313), jaa stator (302) comprising stator windings (313), and - roottorin (301), joka on jonkin patenttivaatimuksista 1 - 9 mukainen ja tuettu pyörivästi suhteessa staattoriin.a rotor (301) according to any one of claims 1 to 9 and rotatably supported relative to the stator. 11. Menetelmä induktiokoneen roottorin häkkikäämityksen kokoamiseksi, 5 tunnettu siitä, että menetelmässä:11. A method for assembling a rotor cage winding of an induction machine, characterized in that the method: - sijoitetaan (401) johdintankoja roottorin sydänrakenteen uriin siten, että johdintankojen päät ulkonevat roottorin sydänrakenteen kussakin päässä aksiaalisesti roottorin sydänrakenteesta siten, että pidemmät päistä ulkonevat aksiaalisesti pidemmän matkaa kuin lyhyemmät päistä,- positioning (401) the conductor rods in the grooves of the rotor core structure such that the ends of the conductor rods project axially from each end of the rotor core structure so that the longer ends protrude axially longer than the shorter ends, 10 - sijoitetaan (402) ensimmäiset päätyrenkaat siten, että lyhyemmät ja pidemmät johdintankojen päistä työntyvät ensimmäisten päätyrenkaiden aukkojen läpi,10 - positioning (402) the first end rings so that shorter and longer ends of the wire rods project through the openings of the first end rings, - kiinnitetään (403) lyhyemmät johdintankojen päistä ensimmäisiin päätyrenkaisiin,- securing (403) the shorter ends of the wire rods to the first end rings, 15 - sijoitetaan (404) toiset päätyrenkaat siten, että vain pidemmät johdintankojen päistä työntyvät toisten päätyrenkaiden aukkojen läpi, ja- positioning (404) the second end rings so that only the longer ends of the wire rods project through the openings of the other end rings, and - kiinnitetään (405) pidemmät johdintankojen päistä toisiin päätyrenkaisiin.- securing (405) longer from the ends of the wire rods to the other end rings. 12. Patenttivaatimuksen 11 mukainen menetelmä, jossa johdintangot sijoitetaan roottorin sydänrakenteen uriin siten, että roottorin sydänrakenteen kussakin päässäThe method of claim 11, wherein the guide rods are disposed in grooves in the rotor core structure such that at each end of the rotor core structure 20 on johdintankojen lyhyemmistä päistä vierekkäisten lyhyempien päiden välissä yksi johdintankojen pidemmistä päistä, ja johdintankojen pidemmistä päistä vierekkäisten pidempien päiden välissä on yksi johdintankojen lyhyemmistä päistä.20 is one of the longer ends of the wires between adjacent shorter ends and one of the shorter ends of the wires between adjacent longer ends. 13. Patenttivaatimuksen 11 tai 12 mukainen menetelmä, jossa kukin johdintangoista käsittää ensimmäisen päätyosion, keskiosion ja toisen päätyosionThe method of claim 11 or 12, wherein each of the conductor bars comprises a first end portion, a middle portion and a second end portion 25 niin, että keskiosio on leveämpi radiaalisessa suunnassa kuin ensimmäinen ja toinen päätyosio, ja ensimmäinen päätyosio on aksiaalisesti pidempi kuin toinen päätyosio, ja johdintangot sijaitsevat roottorin sydänrakenteen urissa siten, että ensimmäiset päätyosiot muodostavat pidemmät johdintankojen päistä, ja toiset päätyosiot muodostavat lyhyemmät johdintankojen päistä.25 such that the central portion is wider in the radial direction than the first and second end portions, and the first end portion is axially longer than the second end portion, and the conductor bars are located in the grooves of the rotor core structure. 14. Jonkin patenttivaatimuksista 11-13 mukainen menetelmä, jossa lyhyemmät johdintankojen päistä on kiinnitetty ensimmäisiin päätyrenkaisiin tyssäämällä 5 lyhyemmät päistä aksiaalisesti niiden sovittamiseksi tiukasti ensimmäisten päätyrenkaiden aukkojen seinämiin, ja pidemmät johdintankojen päistä on kiinnitetty toisiin päätyrenkaisiin tyssäämällä pidemmät päistä aksiaalisesti niiden sovittamiseksi tiukasti toisten päätyrenkaiden aukkojen seinämiin.The method of any one of claims 11 to 13, wherein the shorter ends of the wire rods are secured to the first end rings by inserting the shorter ends axially to fit tightly to the walls of the first end ring holes, and .
FI20175678A 2017-07-11 2017-07-11 A rotor of an induction machine and a method for assembling a cage winding of the rotor FI128259B (en)

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US854760A (en) * 1906-09-11 1907-05-28 Gen Electric Induction-motor.
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JP4728419B2 (en) 2009-10-07 2011-07-20 ファナック株式会社 Cage type rotor and method of manufacturing a cage type rotor
DE102015204872A1 (en) * 2014-10-09 2016-04-14 Robert Bosch Gmbh Squirrel cage rotor for an electric asynchronous machine with a short-circuit ring stabilizing tie rods
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