EP2891227A2 - Procédé et système de déformation de rainures de stator de machine dynamo-électrique - Google Patents

Procédé et système de déformation de rainures de stator de machine dynamo-électrique

Info

Publication number
EP2891227A2
EP2891227A2 EP13766882.8A EP13766882A EP2891227A2 EP 2891227 A2 EP2891227 A2 EP 2891227A2 EP 13766882 A EP13766882 A EP 13766882A EP 2891227 A2 EP2891227 A2 EP 2891227A2
Authority
EP
European Patent Office
Prior art keywords
deformation
rockers
advance
stator
movement
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Withdrawn
Application number
EP13766882.8A
Other languages
German (de)
English (en)
Inventor
Orlando Starke
Anderson Wolf
Heber De Carvalho Hespanhol
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Whirlpool SA
Original Assignee
Whirlpool SA
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 Whirlpool SA filed Critical Whirlpool SA
Publication of EP2891227A2 publication Critical patent/EP2891227A2/fr
Withdrawn legal-status Critical Current

Links

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
    • H02K1/16—Stator cores with slots for windings
    • H02K1/165—Shape, form or location of the slots
    • 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
    • H02K15/024—Methods or apparatus specially adapted for manufacturing, assembling, maintaining or repairing of dynamo-electric machines of stator or rotor bodies with slots

Definitions

  • This invention is concerned with an improved process for manufacturing a dynamo- electric machine stator. More preferably, the present invention relates to a process of deformation of grooves provided on blades used for mounting the structure of an electric motor stator, this process being accomplished by an angular movement of a rocker component, which is driven by the action of at least one advance rod that moves vertically due to the hammer of a press.
  • the present invention further relates to the system for deformation of grooves that help manufacturing the blades used for mounting the structure of stators of dynamo-electric machines.
  • machines of the dynamo- electric type are equipment for the energy transformation, in particular, they are able to transform electrical into mechanical energy, e.g. electric motors, or vice versa, transform mechanical into electrical energy such as generators.
  • This equipment are usually formed by fixed and movable inductive cores, being its operation based on the electromagnetic induction generated by the interaction between said inductive cores.
  • the fixed cores are arranged and accommodated in the body of the stator, and the movable cores are arranged in the rotor body, the interaction between these cores is able to generate a magnetic field sufficient to move the rotor and hence obtain the transformation of the electrical energy into mechanical energy.
  • the dynamo-electric machine stator is mainly integrated by a metal frame or structure and a plurality of coils (electrical conductors arranged on a surround manner around shoes), wherein the coils are disposed in alignment with respect to the frame metal.
  • the metal frame of a stator defines radial shoes circumferentially spaced apart and circumferentially joined together through the outer ends thereof (with the inner ends spaced from each other). These shoes ultimately define structures in which electrical conductors are rolled, and the spaces between these shoes are meant to accommodate the volume formed for the accommodation of the electrical conductors.
  • each shoe and its respective coil conform a fixed inductive core.
  • the rotor (whose physical embodiment is similar to the physical embodiment of the stator) is mounted inside the stator, and because of this, the shoes of the metal frame of the stator have a length dimensioned to form an empty central space, such space intended for accommodation and positioning of the rotor.
  • Figure 1 shows a schematic and planned view of a blade of a dynamo-electric machine stator according to a conventional embodiment belonging to the prior art.
  • stator and the rotor of a same dynamo-electric machine can be obtained from the same metal sheet, as the rotor has dimensions substantially equivalent to the empty space existing in the center of the stator.
  • handling of metal monoblock consists of complex industrial processes, which produce results of questionable quality.
  • the metal frames of stators of dynamo- electric machines of the prior art are typically made from the junction of multiple metal strips of format equivalent to each other.
  • An example of this embodiment can be seen in document US 2011/0127876, wherein it is illustrated and described that a single metal sheet (raw material), when subjected to a stamping process, may be used for manufacturing multiple stator blades and multiple rotor blades. It is also emphasized that the rotor blades are manufactured from the exceeding raw material obtained after stamping of the stator blades.
  • the area of the electrical conductors that conforms the coils of the stator comprises a feature capable of influencing the efficiency of the dynamo-electric machine. More specifically, it is known that electrical conductors of smaller area are more susceptible to the occurrence of Joule effect, besides the intrinsic limitation on the nominal value of the electric current that these conductors support. Therefore, there is an interest that electrical conductors that form the coils of the stator exhibit the largest possible area (within the needs of each project).
  • the area of the electrical conductors that conform the coils of the stator tends to be limited by characteristics of the metal frame of the stator.
  • each of the shoes of the stator blade has a final end defined by two side flaps. Therefore, the area of the electrical conductors comprising the coils of the stator ends up being limited to the space existing between the side flaps of consecutive shoes, being the process of inserting the wire in the stator limited by this space between the side flaps.
  • the aforementioned space between the side flaps of consecutive shoes also comprises a feature capable of influencing the efficiency of the dynamo-electric machine, this because the higher this spacing, the higher the magnetic dispersion of the inductive core and, consequently, the higher the yield loss of the dynamo- electric machine (relationship between the amount of electrical energy transformed into mechanical energy or vice versa).
  • Document PI 9702724-3 describes an optimized embodiment of blade of stator of electric motor.
  • the side flaps of the shoes are able to be handled during the process for manufacturing the stator, thereby allowing the "opening” and the "closure” of the housing channels of electrical conductors. More particularly, it is noted that the "opening” and “closure” of the channels occur through the deformation of the side flaps of the shoes.
  • the great negative aspect referring to the embodiment described in document PI 9702724-3 refers to the deformation need of the side flaps of the shoes to close and, above all, to open the channels, after all, it is extremely complex to grouping multiple blades whose side flaps of the shoes are pivoted.
  • the "opening" of the channels is performed in an equipment provided with a puncture where each channel is invaded by a puncture, and each of the lower ends of the shoes is supported in a sort of deformation template.
  • the movement (from inside outwards) of the puncture tool forces the side flaps of the shoes against the template, and this cause said side flaps to assume the shape of said template.
  • the side flaps of the shoes of the slots in the blades are deformed in the stamping step itself. More particularly, through the oscillatory movement in the press and, in the sequence of the stamping and removal of the exceeding raw material for mounting the rotor.
  • the present invention provides a system for deformation of the grooves of blades for stator, said system being comprised of technical and functional characteristics able to promote the proper deformation of the side flaps of the shoes to the functional opening of the housing channels of the electrical conductors. More particularly, the system of the present invention is able to solve the drawbacks of the prior art commented above, but mainly to obtain one stator blade suitable for receiving the electrical conductors in such a way that, during the manufacturing and assembly process of the stator, it has an easy handling configuration for secure closing of said channels.
  • this process comprises at least one stamping step of raw material for conformation of at least one blade and it is different from the other existing processes due to the fact that it forsees, after performing of said "first” step, at least one "other” deformation step of the side flaps of the adjacent shoes of the grooves of the stator blade.
  • this "other" step comprises basically the following sub- steps: at least one vertical advance movement of at least one advance rod cooperating with a set of rockers, at least one angular advance movement of a plurality of deformation punctures cooperating to said set of rockers, at least one vertical retreat movement of said advance rod promoted by at least one return mechanism, and at least one angular retreat movement of the plurality of deformation punctures to the initial positions thereof.
  • the angular advance movement of the plurality of deformation punctures is able to force the collision between each puncture with a respective adjacent side flap of the slot of the stator blade.
  • the interaction of the advance rod with the respective rockers thereof also promotes the angular movement of said rockers and, consequently, the angular advance movement of the deformation punctures.
  • the interaction of the return mechanism with the respective rockers thereof also promotes the angular movement of said rockers) and hence the angular retreat movement of the deformation punctures.
  • the vertical advance movement of the advance rod is carried out by the vertical actuation of the hammer of the stamping press of the blades.
  • the return mechanism is actuated by means of a return force, which can be matched to the resilient force of a spring, or even the strength of an electric actuator.
  • the present invention also relates to a system for deformation of grooves in stator blades of dynamo-electric machine, which was specially developed aiming to perform the process detailed above.
  • said deformation system comprises in a same manufacturing plant, at least one means for stamping of raw material and conformation of at least one blade and at least one means able to deform the side flaps of the adjacent shoes of the grooves of at least one blade.
  • said manufacturing plant comprises a stamping central unit integrated by at least one cutting stamping module and at least one physical collision deformation module of moving components.
  • the physical collision deformation module of moving components at least one advance rod concentrically aligned to the at least one set of rockers, wherein said advance rod comprises one end configured to interact with a plurality of rockers arms, at least a plurality of rockers each provided with deformation puncture, each of the rocker pivotally connected to a single fixed structure and the deformation punctures being radially aligned to the position of the side flaps of the adjacent shoes of the grooves of the stator blade, and at least one return mechanism able to drive said rocker arms with said deformation punctures to the initial position.
  • the interaction contact between the ends of the advance rod and said rockers is of the wedge type (which may be by a chamfered or radial area, as illustrated in the figures listed below).
  • the return mechanism is connected to a system able to promote a return force.
  • Figure 1 illustrates an exemplary stator blade obtained during the stamping step of raw material according to the present invention
  • Figure 2 illustrates an exemplary stator blade obtained after performing the deformation process of the groove according to the present invention.
  • Figure 3 illustrates an exemplary embodiment of the deformation system in accordance to the present invention.
  • the stator blade 1 obtained during the stamping step comprises a plurality of shoes 4, which are radially arranged and have, each, two side flaps 5 arranged in the inner ends thereof 4.
  • These stator blades 1 when properly grouped one on the other, conform the metal frame of the stator, defining two housing channels 2 for electrical conductors.
  • Figure 2 illustrates the same stator blade 1 after the deformation process of the grooves according to the present invention. More particularly, it is observed that said side flaps 5 are deformed so as to promote the opening of the housing channel 2 to the electrical conductors (not shown).
  • said first stator blade 1 is subjected to a deformation process of the grooves that, during stamping of the raw material and conformation of the blade as illustrated by Figure 1 , is subjected to a step (A1 ) which comprises the deformation of the grooves which are formed by side flaps 5 of adjacent shoes 4 of the stator blade 1.
  • Said step (A1 ) comprises the following sub-steps:
  • Said advance rod 7 comprises a chamfered end capable of angularly moving a rocker 8 which is pivoted in articulating pin 8' and is provided with a deformation puncture 9 to contact said grooves of the stator blade 1. Moreover, due to the angular movement of the punctures 9 through the interaction between the end of the advance rod 7 and said rockers 8, said punctures 9 are forced to collide with a respective groove of the stator blade 1. Through this movement and collision, the opening for the housing channels 2 of the electrical conductors is formed.
  • the vertical movement of the rod 7 is performed by the driving vertical movement of the stamping press of the stator blades 1 , particularly by the hammer of the press.
  • said return disc 10 is moved by means of a return mechanism F, which may be a spring, electric or electronic mechanism or, also, and alternatively, the press structure itself, in which case said return disk 10 is interconnected to the hammer of the press so as to be driven according to the oscillatory movement of said press.
  • a return mechanism F which may be a spring, electric or electronic mechanism or, also, and alternatively, the press structure itself, in which case said return disk 10 is interconnected to the hammer of the press so as to be driven according to the oscillatory movement of said press.
  • the present invention also relates to a system for deformation of grooves in blades of dynamo-electric type machine stator, said system being comprised of at least one stamping means of raw material and conformation of a stator blade 1 , as illustrated in Figure 2, and at least one set of advance rod 7 radially distributed around said blade 1 and aligned with respective grooves, which are formed between the side flaps 5 of adjacent shoes 4.
  • the end of the advance rod 7 comprises a chamfered configuration that makes it possible to drive a respective rocker 8 pivoted in an articulating pin 8', and it is provided with a deformation puncture 9 responsible to produce the opening for the housing channel 2 of electrical conductors.
  • the system comprises at least one return disc 10 which leads said rockers 8 together with its punctures 9 to the initial position.
  • Said advance rods 7 are moved through the driving vertical movement of the stamping press of the blades 1.
  • said return disc 10 is moved by means of a return mechanism F, which may be a spring, electric or electronic mechanism or, even, the press structure itself, in which case said return disc 10 is interconnected to the hammer of the press, so as to be driven according to the oscillatory movement of said press.
  • a return mechanism F which may be a spring, electric or electronic mechanism or, even, the press structure itself, in which case said return disc 10 is interconnected to the hammer of the press, so as to be driven according to the oscillatory movement of said press.

Landscapes

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

Abstract

La présente invention concerne un procédé et un système de déformation de rainures d'aubes de stator de machines dynamo-électriques pouvant favoriser une ouverture appropriée des canaux de logement (2) des conducteurs électriques. Plus particulièrement, la présente invention concerne un procédé et un système qui comprennent des tiges (7) d'avancement réparties radialement autour de ladite aube (1) et alignées sur des rainures respectives formées entre des rabats latéraux (5) de semelles adjacentes (4), ladite extrémité de ladite tige (7) d'avancement ayant une configuration appropriée pour interagir avec un culbuteur respectif (8) ayant pivoté dans un axe d'articulation (8'), chacun étant pourvu d'un élément de perforation (9) avec déformation qui provoque l'ouverture des canaux de logement (2) des conducteurs électriques; et au moins un disque de retour (10) pour entraîner lesdits culbuteurs (8) ensemble avec lesdits élément de perforation (9) vers la position initiale.
EP13766882.8A 2012-08-31 2013-08-30 Procédé et système de déformation de rainures de stator de machine dynamo-électrique Withdrawn EP2891227A2 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
BR102012022078A BR102012022078A2 (pt) 2012-08-31 2012-08-31 Processo e sistema de deformação de ranhuras de estator de máquina dínamo-elétrica
PCT/BR2013/000337 WO2014032153A2 (fr) 2012-08-31 2013-08-30 Procédé et système de déformation de rainures de stator de machine dynamo-électrique

Publications (1)

Publication Number Publication Date
EP2891227A2 true EP2891227A2 (fr) 2015-07-08

Family

ID=50184499

Family Applications (1)

Application Number Title Priority Date Filing Date
EP13766882.8A Withdrawn EP2891227A2 (fr) 2012-08-31 2013-08-30 Procédé et système de déformation de rainures de stator de machine dynamo-électrique

Country Status (4)

Country Link
EP (1) EP2891227A2 (fr)
CN (1) CN104737420A (fr)
BR (1) BR102012022078A2 (fr)
WO (1) WO2014032153A2 (fr)

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4176444A (en) * 1977-09-19 1979-12-04 Industra Products, Inc. Method and apparatus for assembling dynamoelectric machine stators
JPH04347562A (ja) * 1991-05-24 1992-12-02 Mitsuba Electric Mfg Co Ltd 回転電機における固定子構造

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO2014032153A3 *

Also Published As

Publication number Publication date
WO2014032153A3 (fr) 2014-06-26
BR102012022078A2 (pt) 2014-07-29
CN104737420A (zh) 2015-06-24
WO2014032153A2 (fr) 2014-03-06

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