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WO2018162062A1 - Élément périphérique, rotor et machine électrique - Google Patents

Élément périphérique, rotor et machine électrique Download PDF

Info

Publication number
WO2018162062A1
WO2018162062A1 PCT/EP2017/055519 EP2017055519W WO2018162062A1 WO 2018162062 A1 WO2018162062 A1 WO 2018162062A1 EP 2017055519 W EP2017055519 W EP 2017055519W WO 2018162062 A1 WO2018162062 A1 WO 2018162062A1
Authority
WO
WIPO (PCT)
Prior art keywords
wall
surrounding element
projections
rotor
aperture
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.)
Ceased
Application number
PCT/EP2017/055519
Other languages
English (en)
Inventor
Jouni Ikäheimo
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.)
ABB Schweiz AG
Original Assignee
ABB Schweiz AG
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 ABB Schweiz AG filed Critical ABB Schweiz AG
Priority to PCT/EP2017/055519 priority Critical patent/WO2018162062A1/fr
Publication of WO2018162062A1 publication Critical patent/WO2018162062A1/fr
Anticipated expiration legal-status Critical
Ceased 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
    • H02K1/22—Rotating parts of the magnetic circuit
    • H02K1/28—Means for mounting or fastening rotating magnetic parts on to, or to, the rotor structures
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K2201/00—Specific aspects not provided for in the other groups of this subclass relating to the magnetic circuits
    • H02K2201/09—Magnetic cores comprising laminations characterised by being fastened by caulking

Definitions

  • the invention relates to how to find a better and easier way to attach to each other a central element and one or more surrounding elements each having an aperture such as central aperture for the central element.
  • the central element can be a shaft or tube or rod, preferably long enough to accommodate/support several or even a long stack of those consecutive surrounding elements.
  • the invention relates also to one or more surrounding elements, as such.
  • the invention relates to how to find a better and easier way to attach to each other a rotor shaft (central element) and one or both end plates (a surrounding element) of the rotor or one or more rotor discs (a surrounding element), each end plate and rotor disc having an aperture for the central element.
  • the rotor discs are called core elements because they belong to rotor core.
  • electric machine refers especially to electric motors and to electric generators.
  • the core elements of the rotor are approximately circular, plate-like core elements made of magnetically conductive material, the material such as electric steel having high value of relative permeability.
  • the middle of each core element there is an aperture so a central hole for the shaft of the rotor.
  • Stack of core elements are as- Implemented on the rotor shaft (central element), and end plates (also surrounding elements) are assembled to both ends the stack of core elements.
  • One aspect relating to electric motors and the rotors of those motors is the way how is it is secured that, the end plates (surrounding elements) and the core elements (surrounding elements) between the end plates remain firmly together in the stack on consecutive core elements. This is an important aspect because the rotational speed of the rotor and included rotor core can be several thousand rpm (revolutions per minute).
  • heat shrink technology it can be said that it is not a cost effective to use heat shrink technology requiring high tolerance for the manufacturing the items (end plate, shaft) that are supposed to be fixed together with that technology.
  • used of stud bolts they are not an optimal solution in regard to costs and the needed manual work.
  • the location of the binding means can also create problems for the electro-magnetic operation of the rotor.
  • the present invention seeks to provide an improvement. According to an aspect of the present invention, there is provided a surrounding element as specified in claim 1.
  • a rotor for an electric machine as specified in claim 14.
  • an electric machine as specified in claim 15.
  • the basic idea behind the improvement is to modify, near the aperture/hole, the stiffness of the surrounding element.
  • the basic idea is the modify the stiffness of the end plate and/or stiffness of the rotor disc (core element), near the central aperture/hole.
  • the improvement provides advantages. It is possible to use cost effective methods of low-tolerance manufacturing, compared to earlier high-tolerance machining. Also, in assembly process, simple method like press fit - method can be used, without a need for heat shrink facility.
  • Figure 1 illustrates an end plate of a rotor, with curved projections and cuts
  • Figure 2 illustrates an end plate of the rotor, said end plate being supported to shaft of the rotor.
  • Figure 3 illustrates a rotor comprising a rotor shaft with several rotor discs (core elements) between the end plates of the rotor.
  • Figure 4 illustrates a rotor disc (core element) of a rotor, with some dimension markings
  • Figure 5 illustrates an end plate of the rotor, but with straight linear projections and cuts.
  • Figure 6 illustrates another variation of the cuts and projections/protrusions. DESCRIPTION OF EMBODIMENTS
  • the invention relates to how to find a better and easier way to attach to each other a central element SH and one or more surrounding elements 101-104 and/or PL1, PL2.
  • the surrounding elements 101-104 are core elements of a rotor 800 of an electric machine.
  • the surrounding elements 101-104 are rotor discs.
  • Electric machine can be an electric motor or an electric generator.
  • the surrounding elements can be end plates PL1, P2 of the rotor 800.
  • Rotor 800 comprises several consecutive core elements (rotor discs) 101-104.
  • the number of consecutive core elements can be clearly higher than in this shown embodiment where there are only four core elements 101-104.
  • Core elements 101-104 are typically laminated together for forming the stack of consecutive core elements. Core elements 101-104 are insulated from each other, so they are not in galvanic contact with each other. Stack of core elements 101-104 with end plates PL1 PL can be called a rotor core. Rotor core is supported on the shaft SH of the rotor. At the end of the stack of core elements, there are end plates PLl, PL2. Originally, the root of this invention comes from a desire to modify the end plates, such as PLl, in such way that it/they can be fixed to shaft SH in an easier way.
  • the core elements 101-104 and the end plates PLl, PL2 are those surrounding elements, they are supported on the central element which is shaft SH in an embodiment.
  • the diameter of the shaft SH or other central element is such that it correspond to diameter of the central aperture API plus 2 x (doubled) width of the cut, like cut CI between the finger-like projections, like F20, Fl.
  • the shape of the central aperture API and the related central element SH such as shaft SH instead of round circular shape, the shape can be square-shaped, for example.
  • the shape of the outer circumference (rim) RI of the surrounding element like end plates PLl, PL2 and rotor discs 101-104, instead of strictly round circular shape, the shape may be discontinuous having cutaway areas.
  • core element 101 which is the first element at the first end El of the rotor.
  • the other core elements 102-104 can have same structures as core element 101.
  • the core element 101 may be a round plate which is made of material having first magnetic conductance.
  • the core element 101 may have a constant thickness.
  • the material of the core element 101 may be electrical steel having high value of relative permeability.
  • end plates are PLl
  • PL2 can be a round plate of constant thickness.
  • Surrounding element like PL1, has an aperture API such as central aperture for accommodating the central element SH.
  • the inventions relates especially to surrounding element, either alone or assembled on a central element like shaft SH or tube.
  • the invention relates to a device 800 (such as rotor) comprising a tube, shaft SH or other central element SH and one or more surrounding elements like PL1, 101-104, PL2
  • a surrounding element like PL1, comprises a wall Wl and an aperture API in the wall Wl.
  • the aperture API in the wall of the surrounding element is arranged to accommodate the central element SH.
  • the wall Wl comprises several fingerlike projections Fl - F20. Projections are between related cuts CI - C20 forming the finger-like projections F1-F20 therebetween.
  • Each projection extend in the wall Wl to a direction that at least partly deviates from the radial direction RD of the surrounding element PL1, so as to cause the projections to create spring-effect towards the aperture API (filled with element SH) and central element SH therein, preferably in the direction between the outer circumference of the surrounding element and the aperture of the surrounding element.
  • the surrounding element is such that next to the aperture API of the wall and ending to the circumference APRI of the aperture API, the wall Wl of the surrounding element comprises several fingerlike projections F1-F20, F51, F70 (in fig 5) between related cuts C1-C20 forming the projections F1-F20; F51, F70 therebetween.
  • Each projection F1-F20; F51, F70 extend in the wall Wl to a direction that at least partly deviates from the radial direction RD of the surrounding element PL1, 101-104, so as to cause the projections F1-F20; F51, F70 to create spring-effect.
  • the projections may be directed to direction that is the same direction as the radius (having radial direction RD) in that same point.
  • projections F51, F70 have straight linear form
  • the inclination angle of those linear projections i.e protrusions F51, F70 may be 10-80 degrees, compared the radial direction RD (RD shown in fig. 4).
  • the above mentioned inclination angle is about 45 degrees.
  • the above mentioned inclination angle is between 35-55 degrees.
  • the thickness of the surrounding elements such as end plates PL1, PL2 is between 5-10 mm and are made of steel.
  • the thickness of other kind of surrounding element like rotor disc 101 i.e. core element 101 of figures 3-4 is around 500 micrometres.
  • the tangential extent of the finger (finger projection i.e. protrusion, like F1-F20) end (tip) facing the central aperture API circumference (rim) APRI, is between 60 % and 10 %, preferably between 50 % and 20 %, compared to the tangential extent of the finger's geometry projection (geometrical concept, not physical item) on the central aperture API circumference APRI.
  • finger end is the tip of the projection/protrusion.
  • Tangential extent of the finger-like projection/protrusion F1-F20 can be regarded to be the width of the finger-like projection/protrusion. In other words, we compare the width of the finger-like protrusion F1-F20 to the geometry projection of the same protrusion. As can be understood, the geometry pro- jection (of the fingerlike projection/protrusion) on the aperture API circumference (rim) APRI is not be confused with fingerlike projections F1-F20 itself.
  • the extent-length EL of the projection when considered in the radial direction RD, is at least 10 % of the extent length ELW of the wall Wl.
  • extent length ELW of the wall Wl is the distance from the circumference (rim) APRI of the aperture API within the wall Wl to the outer circumference RI of the wall Wl.
  • One possible exemplary diameter of surround elements PL1, PL2, 101-104 is about 30 cm, then the radial length i.e. extent length ELW the wall Wl is about 10 cm.
  • the extent length of the finger-like pro- jections F1-F20 i.e protrusions F1-F20 can be a lot less than the above mentioned 10 % of the radial extent length ELW of the wall Wl. Therefore, regarding real physical dimensions, in an embodiment, regarded in radial direction, the extent length of the finger-like projections F1-F20 i.e protrusions F1-F20 might be as short as 1 micrometres, with about similar length of the cuts C1-C20.
  • the extent length of the projections F1-F20 and/or cuts C1-C20 is between 1 micrometre and 5 cm.
  • the above mentioned length is between 1 micrometre and 100 micrometres, flexibility is achieved, without weakening the structure.
  • the extent- length EL of the projection when considered in the radial direction RD, is 50 % or less of the extent length ELW of the wall Wl.
  • the extent length ELW of the wall is the distance from the circumference (rim) APRI of the aperture API within the wall to the outer circumference rim) RI of the wall Wl.
  • the outer ends i.e roots i.e starting points of the finger-like projections F1-F20 between each two concecutive bottoms of the cuts C1-C20 form a circle on the wall Wl of the surrounding element PL1 such as of the disc PL1.
  • the projections F1-F20 have curved form. This relates to the fact that the cuts C1-C20 have curved form, so the side edges of the projections F1-F20 become curved.
  • the projections, such as projection Fl have side edges SE1A, SE1B facing the previous projection F20 and next projection F2. Therefore, projections F1-F20 have curved form at both edges.
  • projections F51, F70 have straight linear form.
  • projections, like F50 have first and second side edges SE51A, SE51B.
  • First side edge SE51A of the projection F51 faces the side of the previous projection F70.
  • Second side edge SE51B of the projection F51 faces the side of the next projection, and wherein the projections have straight linear form at both side edges.
  • Central aperture is marked with AP51.
  • the cuts are made with laser cutting.
  • Figure 6 illustrates another variation of the cuts and projections.
  • the cuts CC1-CC3 and finger-like projections/protrusions FF2, FF3 have a "wormlike" shape having the edge direction thereof alternating from left to right (or right to left), compared to the radial/radius direction RD. Therefore, also in this embodiment the direction of the finger-like projections/protrusions FF2, FF3 and relates cuts CC1-CC3, deviates from the radial/radius direction RD.
  • the projections F1-F20 form a symmetrical circle of projections, said circle surrounding said aperture API and said central element SH. The same can be seen also from fig. 5 with straight projections F51, F70.
  • the central element SH is the shaft of the rotor 800, and one or more of the surrounding elements is the end plate PL1, PL2 of the rotor or the rotor core disc 101-104 of the rotor 800.
  • the invention also relates to a rotor for an electric machine. Additionally, the invention also relates to an electric machine, comprising a rotor 800. Electric machine can be, for example, a reluctance motor or a permanent magnet motor (PM motor).
  • the core element 101 of the rotor 800 comprises the above discussed structures, such as projections (marked only Fl and F20) between related cuts (marked only CI and C20), and central aperture API for the shaft.
  • the rotor disc has voids V1-V4 to facilitate inserting of permanent magnet rods.
  • the end plates PL1, PL2 and the core elements (rotor discs) 101-104 can be assembled on the shaft SH by press-fit technology, no need for heat shrink - technology.
  • the central element SH is the liquid transfer tube of a heat exchanger, and then the surrounding element is the heat exchange flange supported to said tube.
  • the central element SH in figure 2 would be the transfer tube and surrounding element, like PL1, would be heat exchange flanges but separated from other flanges.
  • the finger-like projections/protrusions in heat transfer flange would press themselves against the surface of the tube.
  • the invention provides benefits because the diameter/thickness of the tube may vary.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Iron Core Of Rotating Electric Machines (AREA)

Abstract

L'invention concerne un élément périphérique comprenant une paroi (W1) et une ouverture (AP1) dans la paroi (W1), ladite paroi (W1) entourant l'ouverture (AP1) dans la paroi (W1) de l'élément environnant (PL1, 101-104). À côté de l'ouverture (API) de la paroi et se terminant au niveau de la circonférence (APRI) de l'ouverture (AP1), la paroi (W1) de l'élément environnant comprend plusieurs projections en forme de doigt (F1-F20 ; F51, F70) entre des découpes associées (C1-C20) formant les projections (F1-F20 ; F51, F70) entre elles. Chaque projection (F1-F20 ; F51, F70) s'étend dans la paroi (W1) dans une direction qui s'écarte au moins partiellement de la direction radiale (RD) de l'élément périphérique (PL1, 101-104), de manière à engendrer un effet de ressort avec les projections (F1-F20 ; F51, F70).
PCT/EP2017/055519 2017-03-09 2017-03-09 Élément périphérique, rotor et machine électrique Ceased WO2018162062A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PCT/EP2017/055519 WO2018162062A1 (fr) 2017-03-09 2017-03-09 Élément périphérique, rotor et machine électrique

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/EP2017/055519 WO2018162062A1 (fr) 2017-03-09 2017-03-09 Élément périphérique, rotor et machine électrique

Publications (1)

Publication Number Publication Date
WO2018162062A1 true WO2018162062A1 (fr) 2018-09-13

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ID=58264534

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PCT/EP2017/055519 Ceased WO2018162062A1 (fr) 2017-03-09 2017-03-09 Élément périphérique, rotor et machine électrique

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Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5986366A (en) * 1998-09-23 1999-11-16 Sundstrand Corporation Rotor for a dynamoelectric machine
EP1992891A1 (fr) * 2002-10-31 2008-11-19 Valeo Systemes Thermiques Condenseur, notamment pour un circuit de climatisation de véhicule automobile, et circuit comprenant ce condenseur
EP2365615A2 (fr) * 2010-03-03 2011-09-14 Aisin Seiki Kabushiki Kaisha Machine rotative électrique
DE102011121531A1 (de) * 2011-12-16 2013-06-20 Robert Bosch Gmbh Ringförmiges Rotorblech mit Innenkontur für einen Elektromotor
US20140360224A1 (en) * 2013-06-05 2014-12-11 Hamilton Sundstrand Corporation Evaporator Heat Exchanger
US20150180293A1 (en) * 2013-12-20 2015-06-25 Nidec Motors & Actuators Connection Of Rotor Core Assembly And Rotor Shaft At An Electrical Machine

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5986366A (en) * 1998-09-23 1999-11-16 Sundstrand Corporation Rotor for a dynamoelectric machine
EP1992891A1 (fr) * 2002-10-31 2008-11-19 Valeo Systemes Thermiques Condenseur, notamment pour un circuit de climatisation de véhicule automobile, et circuit comprenant ce condenseur
EP2365615A2 (fr) * 2010-03-03 2011-09-14 Aisin Seiki Kabushiki Kaisha Machine rotative électrique
DE102011121531A1 (de) * 2011-12-16 2013-06-20 Robert Bosch Gmbh Ringförmiges Rotorblech mit Innenkontur für einen Elektromotor
US20140360224A1 (en) * 2013-06-05 2014-12-11 Hamilton Sundstrand Corporation Evaporator Heat Exchanger
US20150180293A1 (en) * 2013-12-20 2015-06-25 Nidec Motors & Actuators Connection Of Rotor Core Assembly And Rotor Shaft At An Electrical Machine

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