WO2019015824A1 - Générateur électrique à enroulements d'extrémité réduits - Google Patents

Générateur électrique à enroulements d'extrémité réduits Download PDF

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Publication number
WO2019015824A1
WO2019015824A1 PCT/EP2018/062294 EP2018062294W WO2019015824A1 WO 2019015824 A1 WO2019015824 A1 WO 2019015824A1 EP 2018062294 W EP2018062294 W EP 2018062294W WO 2019015824 A1 WO2019015824 A1 WO 2019015824A1
Authority
WO
WIPO (PCT)
Prior art keywords
axial end
axial
frame body
slots
teeth
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/EP2018/062294
Other languages
English (en)
Inventor
Ziad Azar
Alexander Duke
Arwyn Thomas
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.)
Siemens Gamesa Renewable Energy AS
Original Assignee
Siemens Gamesa Renewable Energy AS
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 Siemens Gamesa Renewable Energy AS filed Critical Siemens Gamesa Renewable Energy AS
Publication of WO2019015824A1 publication Critical patent/WO2019015824A1/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
    • H02K1/12—Stationary parts of the magnetic circuit
    • H02K1/14—Stator cores with salient poles
    • H02K1/146—Stator cores with salient poles consisting of a generally annular yoke with salient poles
    • 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
    • H02K15/021—Magnetic cores
    • H02K15/022—Magnetic cores with salient poles
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K2213/00—Specific aspects, not otherwise provided for and not covered by codes H02K2201/00 - H02K2211/00
    • H02K2213/03—Machines characterised by numerical values, ranges, mathematical expressions or similar information
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00—Energy generation through renewable energy sources
    • Y02E10/70—Wind energy
    • Y02E10/72—Wind turbines with rotation axis in wind direction

Definitions

  • the present invention relates to an electric generator having a geometry stator with tooth tips and reduced end windings.
  • An electrical generator such as an electric generator installed in a wind turbine, typically comprises a rotor which rotates relative to a stator.
  • the end winding length is dictated by pliability of the insulation as well as the manufactura- bility of inserting the coil .
  • Stator slots housing the stator coils may have a partly closed opening, for example by providing the stator teeth with respective circumferential tooth protrusions, which is desirable to improve the performances.
  • preformed coils are typically used, the main inconvenience bein the fact that the end winding must be designed to be long enough to allow the respective coil to be deformed in order to clear the tooth protrusion during insertion in the respec tive slot. This extra end winding length required solely for the manufacturing reason of coil insertion produces addition al copper losses throughout the whole life of the machine.
  • an electric generator comprising a stator having a frame body extending axially between a first axial end and a second axial end, the frame body including a plurality of slots extending radially from the frame body to respective radial slot ends, the plurality of slots being circumferentially distributed around a longitudinal axis of the stator extending from one to the other of the first axial end and the second axial end, the frame body comprising at least an axial middle sec- tion distanced from the first axial end and the second axial end,
  • the above described electric generator may be advantageously integrated in a wind turbine.
  • an electrical generator comprising the steps of :
  • a frame body extending axially between a first axial end and a second axial end, the frame body including a plurality of slots extending radially from the frame body to respective radial slot ends, the plurality of slots being circumferentially distributed around a longitudinal axis of the stator extending from one to the other of the first axial end and the second axial end, a circumferential extension of each of the plurality of slots varying along the radial direction in such a way that the circumferential extension is smaller at the respective radial slot end than at a circumferential section distanced from the respective radial slot end,
  • stator geometry achieved through the present invention allows reducing the end winding length required to insert the coil into the slot.
  • each of the plurality of slots at the first axial end and/or at the second axial end is radially constant from the frame body to respective radial slot end.
  • this facilitates the coil insertion at the first axial end and/or at the second axial end of the stator
  • the frame body comprises at least an axial intermediate section between the axial middle section and the first axial end and/or the second axial end, the circumferential extension of each of the plurality of slots in the axial intermediate section varying along the longitudinal axis gradually between a first value and a second value of the circumferential extension.
  • this may remove an abrupt step at the interface (s) between the first axial end or the second axial end and the axial middle section the stator. Such abrupt step may cause damage to the wire insulation in the slots.
  • the frame body includes a plurality of teeth extending radially from the frame body to respective radial tooth ends, each of the plurality of slots extending circumferentially between a pair of teeth of said plurality of teeth and wherein at the axial middle section one of said pair of teeth comprises at the respective radial tooth end a circumferential protrusion extending in the respective slot towards the other of said pair of teeth.
  • the circumferential protrusion in the axial intermediate section has a circumferential length decreasing from the axial middle section towards the first axial end and/or the second axial end.
  • the above described geometry may be obtained by lamination, creating a plurality of slots including the circumferential protrusion along all the axial length of the slot and then removing it at the first axial end and/or the second axial end, in order to allow for easier coil insertion and lower end windings.
  • the circumferential protrusion is present only at the axial middle section of the rotor.
  • the axial middle section may have an axial extension being larger than 50% and smaller than 100%, for example 90%, of the total axial length of the frame body between the first axial end and the second axial end.
  • the plurality of teeth may be symmetrically or asymmetrically distributed around the longitudinal axis of the stator.
  • Figure 1 shows a longitudinal section of an electric generator in accordance with an embodiment of the present invention .
  • Figure 2 shows a circumferential straightened section of the electric generator of Figure 1, according to the sectional line II-II of figure 1.
  • Figure 3 shows a circumferential straightened section of the electric generator of Figure 1, according to the sectional line III-III of figure 1.
  • Figure 4 shows a longitudinal section of an electric generator in accordance with another embodiment of the present invention .
  • FIG. 1 shows an electric generator 10 to be included in a wind turbine. According to other possible embodiments of the present invention, the electric generator 10 may not be included in a wind turbine.
  • the electric generator 10 includes a stator 20 and a rotor 11.
  • the rotor 11 surrounds the stator 20 and is rotatable around a rotational longitudinal axis Y.
  • the rotor 11 is conventional and therefore not described in further details.
  • the stator 20 has a frame body 21 extending axially along the rotational longitudinal axis Y between a first axial end 22 and a second axial end 23.
  • the terms axial, radial and circumferential in the following are made with reference to the rotational longitudinal axis Y.
  • the frame body 21 includes a plurality of slots 30 circumfer- entially distributed around the longitudinal axis Y.
  • the slots 30 extend radially from the frame body 21 to respective radial slot ends 31 and axially from one to the other of the first axial end 22 and the second axial end 23.
  • the plurality of slots 30 house a plurality of stator coils (conventional and not shown in the attached figures) .
  • the frame body 21 comprising at least three sections:
  • first end section 22a and the second end section 23a may be present .
  • a circumferential extension Dl, D2 of each of the plurality of slots 30 at the respective radial slot ends 31 varies along the longitudinal axis Y of the stator 20.
  • in the first end section 22a or in the second end section 23a or in both the circum- ferential extension Dl at the respective radial slot ends 31 is greater than the circumferential extension D2 at the axial middle section 25.
  • Figure 2 shows a section of an embodiment of the electric generator 10 at the axial middle section 25.
  • Figure 3 shows a section of the same embodiment of the electric generator 10 at the first end section 22a and at the second end section 23a.
  • the frame body 21 includes a plurality of teeth 33 extending radially from the frame body 21 to respective radial tooth ends 34 in such a way that each of the plurality of slots 30 extends circumferentially between a pair of teeth of the plurality of teeth 33.
  • one of the teeth 33 comprises at the respective radial tooth end 34 a circumferential protrusion 35 extending in the respective slot 30 towards the other of said pair of teeth 33.
  • the different geometry between the axial middle section 25 and the first end section 22a and/or the second end section 23a permits to reduce the end winding length required to insert the coil into the slots 30.
  • the frame body 21 comprises two axial intermediate sections 27, 28, respectively between the axial middle section 25 and the first axial end 22 and between the ax- ial middle section 25 and the second axial end 23.
  • the circumferential extension of each of the plurality of slots 30 at the respective radial slot end 31 varies along the longitudinal axis Y grad- ually between the first value Dl and the second value D2 of the circumferential extension.
  • the circumferential protrusion 35 in the axial intermediate section 27, 28 has a circumferential length decreasing from the axial middle section 25 towards the first axial end 22 and/or the second axial end 23, in order to provide a smooth transition between the axial middle section 25 and the first end section 22a and/or the second end section 23a.
  • the axial middle section 25 has an axial extension L3 larger than 50% but smaller than 100%, for example 90%, of the total axial length of the frame body 21, between the first axial end 22 and the second axial end 23. Consequently the sum of the axial extensions LI, L2 of the first end section 22a and the second end section 23a is larger than 0% but smaller than the 50%, for example 10%, of the total axial length of the frame body 21.
  • the present invention is independent from the circumferential distribution of the stator teeth.
  • the plurality of teeth 33 may be symmetrically or asymmetrically dis- tributed around the longitudinal axis Y of the stator 20.
  • the stator 20 of the electrical generator 10 may be manufactured as follows.
  • a frame body is formed extending axially between a first axial end 22 and a second axial end 23.
  • the semi-finished frame body includes a plurality of slots 30 extending radially from the frame body to respective radial slot ends 31.
  • the plurality of slots 30 are being circumferentially distributed around a longitudinal axis Y of the stator 20 extending from one to the other of the first axial end 22 and the second axial end 23.
  • each of the plurality of slots 30 varies along the radial direction in such a way that the cir- cumferential extension Dl, D2 is smaller at the respective radial slot end 31 than at a circumferential section 32 distanced from the respective radial slot end 31.
  • the section of each slot 30 is constant in shape along the longitudinal axis Y.
  • portions of the semi-finished frame body are removed at the first axial end 22 and/or at the second axial end 23 of the stator 20 in order that the circumferential extension Dl, D2 of the plurality of slots 30 at the respective radial slot ends 31 is greater at the first axial end 22 and/or at the second axial end 23 than at the axial middle section 25.
  • the plurality of teeth 33 are formed, extending radially from the frame body 21 to respective radial tooth ends 34.
  • the teeth 33 comprise at the respective radial tooth ends 34 the circumferential protrusion 35 extending in the respective slot 30.
  • the circumferential protrusions 35 are removed at the first axial end 22 and/or at the second axial end 23 of the stator 20.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Manufacture Of Motors, Generators (AREA)
  • Iron Core Of Rotating Electric Machines (AREA)

Abstract

L'invention concerne un générateur électrique (10) comprenant un stator (20) ayant un corps de cadre (21) s'étendant axialement entre une première extrémité axiale (22) et une seconde extrémité axiale (23), le corps de cadre (21) comprenant une pluralité de fentes (30) s'étendant radialement depuis le corps de cadre (21) vers des extrémités de fente radiale (31) respectives, la pluralité de fentes (30) étant réparties de façon circonférentielle autour d'un axe longitudinal (Y) du stator (20), le corps de cadre (21) comprenant au moins une section centrale axiale (25). L'extension circonférentielle (D1, D2) de chaque fente de la pluralité de fentes (30) au niveau des extrémités de fente radiale (31) respectives varie le long de l'axe longitudinal (Y) du stator (20), l'extension circonférentielle (D1, D2) au niveau de la première extrémité axiale (22) et/ou au niveau de la seconde extrémité axiale (23) étant supérieure à l'extension circonférentielle (D2) au niveau de la section centrale axiale (25) du corps de cadre (21).
PCT/EP2018/062294 2017-07-21 2018-05-14 Générateur électrique à enroulements d'extrémité réduits Ceased WO2019015824A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102017212593.4 2017-07-21
DE102017212593 2017-07-21

Publications (1)

Publication Number Publication Date
WO2019015824A1 true WO2019015824A1 (fr) 2019-01-24

Family

ID=62245241

Family Applications (1)

Application Number Title Priority Date Filing Date
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Country Status (1)

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WO (1) WO2019015824A1 (fr)

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0439043U (fr) * 1990-07-30 1992-04-02
US20050269891A1 (en) * 2004-06-04 2005-12-08 Hiroaki Shinoki Motor and manufacturing method for the same
US7042130B2 (en) 2002-03-08 2006-05-09 Dura-Trac Motors, Inc. Electrical machine construction using axially inserted teeth in a stator ring or armature
EP2264858A2 (fr) * 2009-05-21 2010-12-22 Mitsubishi Electric Corporation Machine électrique rotative à aimants permanents
US20110193445A1 (en) * 2010-02-05 2011-08-11 Alex Horng Inner-Roter-Type Motor and Claw-Pole Member Thereof
DE102011078513A1 (de) * 2011-07-01 2013-01-03 Robert Bosch Gmbh Trägerzahn zur Aufnahme einer bestrombaren Spule
WO2016059459A1 (fr) * 2014-10-15 2016-04-21 Toyota Jidosha Kabushiki Kaisha Stator pour machine électrique tournante

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0439043U (fr) * 1990-07-30 1992-04-02
US7042130B2 (en) 2002-03-08 2006-05-09 Dura-Trac Motors, Inc. Electrical machine construction using axially inserted teeth in a stator ring or armature
US20050269891A1 (en) * 2004-06-04 2005-12-08 Hiroaki Shinoki Motor and manufacturing method for the same
EP2264858A2 (fr) * 2009-05-21 2010-12-22 Mitsubishi Electric Corporation Machine électrique rotative à aimants permanents
US20110193445A1 (en) * 2010-02-05 2011-08-11 Alex Horng Inner-Roter-Type Motor and Claw-Pole Member Thereof
DE102011078513A1 (de) * 2011-07-01 2013-01-03 Robert Bosch Gmbh Trägerzahn zur Aufnahme einer bestrombaren Spule
WO2016059459A1 (fr) * 2014-10-15 2016-04-21 Toyota Jidosha Kabushiki Kaisha Stator pour machine électrique tournante

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