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WO2025073369A1 - Stator de moteur haute tension - Google Patents

Stator de moteur haute tension Download PDF

Info

Publication number
WO2025073369A1
WO2025073369A1 PCT/EP2023/077598 EP2023077598W WO2025073369A1 WO 2025073369 A1 WO2025073369 A1 WO 2025073369A1 EP 2023077598 W EP2023077598 W EP 2023077598W WO 2025073369 A1 WO2025073369 A1 WO 2025073369A1
Authority
WO
WIPO (PCT)
Prior art keywords
stator
slot
voltage motor
tooth
back iron
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
PCT/EP2023/077598
Other languages
English (en)
Inventor
Stephan Schreckenberg
Ronny Marzog
Jamal Chargui
Andreas Sauer
Sunita DASS
Jan Hendriks
Robin PASCH
Siegurd Klöckner
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.)
Pierburg Pump Technology GmbH
Original Assignee
Pierburg Pump Technology GmbH
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 Pierburg Pump Technology GmbH filed Critical Pierburg Pump Technology GmbH
Priority to PCT/EP2023/077598 priority Critical patent/WO2025073369A1/fr
Publication of WO2025073369A1 publication Critical patent/WO2025073369A1/fr
Pending legal-status Critical Current
Anticipated expiration legal-status Critical

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
    • H02K1/148—Sectional cores
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K3/00—Details of windings
    • H02K3/32—Windings characterised by the shape, form or construction of the insulation
    • H02K3/34—Windings characterised by the shape, form or construction of the insulation between conductors or between conductor and core, e.g. slot insulation
    • H02K3/345—Windings characterised by the shape, form or construction of the insulation between conductors or between conductor and core, e.g. slot insulation between conductor and core, e.g. slot insulation
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K5/00—Casings; Enclosures; Supports
    • H02K5/04—Casings or enclosures characterised by the shape, form or construction thereof
    • H02K5/08—Insulating casings
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K2203/00—Specific aspects not provided for in the other groups of this subclass relating to the windings
    • H02K2203/12—Machines characterised by the bobbins for supporting the windings
    • 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
    • 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
    • H02K3/52—Fastening salient pole windings or connections thereto
    • H02K3/521—Fastening salient pole windings or connections thereto applicable to stators only
    • H02K3/522—Fastening salient pole windings or connections thereto applicable to stators only for generally annular cores with salient poles
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K5/00—Casings; Enclosures; Supports
    • H02K5/04—Casings or enclosures characterised by the shape, form or construction thereof
    • H02K5/20—Casings or enclosures characterised by the shape, form or construction thereof with channels or ducts for flow of cooling medium
    • H02K5/207—Casings or enclosures characterised by the shape, form or construction thereof with channels or ducts for flow of cooling medium with openings in the casing specially adapted for ambient air

Definitions

  • the invention refers to a high-voltage motor stator of a high-voltage electric motor, in particular of a high-voltage electric motor in automotive applications for driving secondary devices, such as a hydrogen blower, an air-conditioning compressor, a coolant pump etc.
  • Automobiles with electric traction engines and traction batteries typically have system voltages of 400 V, 800 V or even more. Some typical secondary devices in an automobile have a performance in the range of some kWh so that the high-voltage circuit is preferred to drive the electric motor. However, a high system voltage requires different isolation measures to avoid electric short circuits and electric leakage currents in the motor stator.
  • an external motor stator is provided with a back iron arrangement with several radial stator tooth bodies defining radial stator slots between the stator tooth bodies.
  • the back iron arrangement is also provided with an outside back iron ring connecting all stator tooth bodies with each other. Every stator tooth body is surrounded by an electromagnetic pole coil.
  • the high-voltage motor stator comprises a back iron arrangement with several radial stator tooth bodies defining the electric poles of the motor stator and defining radial stator slots between the stator tooth bodies, seen in circumferential direction.
  • the back iron arrangement also is provided with a circular back iron ring connecting all stator tooth bodies with each other. The radially outside ends of the stator tooth bodies are directly connected to the circular back iron ring.
  • the back iron arrangement is preferably made of laminated sheet packages of ferromagnetic metal sheets.
  • the back iron ring and the stator tooth bodies are separate parts which are connected to each other by a, for example, form-fit connection.
  • Every stator tooth body is provided with a tooth isolation sleeve constituting an electric isolation.
  • the plastic tooth isolation sleeves can be provided as several separate plastic parts or can be connected to each other so that all plastic tooth isolation sleeves together define a single integral plastic part.
  • Every stator tooth body is provided with an electromagnetic ring-like pole coil which surrounds the corresponding tooth isolation sleeve, respectively.
  • the plastic tooth isolation sleeve guarantees that the coil wire of the pole coil cannot get into direct electrical contact with the stator tooth body.
  • the motor stator also comprises two separate plastic end caps being fixed to both axial ends of the back iron arrangement and thereby axially covering the pole coils.
  • the plastic end caps have as a primary function the mechanical shielding of the pole coils but can have additional functions, such as guidance and leading of the coil wire ends.
  • a separate slot isolation sheet is provided in every stator slot at the slot bottom surface of the stator slots.
  • the slot isolation sheet covers and electrically isolates the radially inside surface of the back iron ring so that the coil wire of the pole coil cannot get into direct electric contact with the back iron ring of the back iron arrangement.
  • the plastic end caps are provided with sheet holding structures, respectively, for holding the slot isolation sheets in position.
  • the sheet holding structures guarantee a defined position of the slot isolation sheet in axial, radial and tangential direction so that the slot isolation sheet cannot shift during the lifetime of the motor stator. Additionally, the sheet holding structures of the plastic end caps facilitate the assembly of the high-voltage motor stator.
  • the sheet holding structures can be of any suitable kind.
  • the sheet holding structures are provided as axial holding slits to which axial end portions of the slot insulation sheets are inserted.
  • the axial holding slits define the spatial position of the slot insulation sheets in axial and radial direction.
  • the axial end portions of the slot insulation sheets are not necessarily additionally fixed at or within the holding slits by clamping, by screws and/or by gluing, but can additionally be fixed within the holding slits.
  • the tooth isolation sleeves each define a ring-like sleeve collar at their radially distal sleeve end, respectively, so that a tangential isolation slit is defined between the sleeve collar and the back iron ring.
  • the plastic sleeve collar is not directly in contact with the back iron ring but defines a small tangential isolation slit together with the radially inside surface of the back iron ring.
  • the slot isolation sheet tangentially extends into both tangential isolation slits of each stator slot, respectively. This measure substantially increases the creepage distance for electric leakage currents between the coil wire at the outside of the pole coil and the back iron ring.
  • the tangential depth of the isolation slit is at least 1.0 mm, and preferably is more than 2.0 mm, so that the resulting creepage distance is sufficient for a typical system voltage of 400 V or, with more than 4.0 mm depth, for 800 V.
  • the axial holding slits are, seen in axial direction, parallel to the inner slot bottom surface of the back iron ring, so that also the slot isolation sheet is, seen in axial direction, more or less parallel to the preferably cylindrical radially inside surface defining the slot bottom surface of the back iron ring.
  • the plastic end caps both are located axially outside of the stator slots and do not axially extend into the stator slots. More preferably, the plastic end caps can be in axial contact with the axial surface of the back iron arrangement to perfectly define the axial position of the plastic end caps.
  • the end caps are directly fixed to the tooth isolating sleeves, wherein the fixation can be provided by an axial snap-fit connection, by gluing and/or by other suitable fixation means, techniques and methods.
  • the end caps are provided with cooling fluid openings which are axially in-line with the stator slots. More preferably, the cooling fluid openings substantially have the contour of the free space of the corresponding stator slot.
  • the free space in this context is the free axial space in a stator slot which is not filled with the stator tooth bodies, the tooth isolating sleeves and the electromagnetic pole coils.
  • the free axial space and the corresponding cooling fluid openings allow an axial cooling fluid flow through the motor stator, wherein the cooling fluid preferably is cooling air.
  • the axial length of the slot isolation sheet is at least equal to the axial extend of the corresponding electromagnetic pole coil.
  • a high voltage in the present context is generally a voltage above 60 V which requires structural protection means and measures to avoid unintentional contact of a person with the high voltage.
  • a high voltage in the present context is at least 200 V which requires substantial structural means and measures to avoid electric leakage currents.
  • figure 1 shows a longitudinal sectional view I-I of a high-voltage motor stator with plastic end caps having sheet holding structures for holding slot isolation sheets in position
  • figure 2 shows a transversal sectional view II-II of the motor stator of figure 1
  • figure 3 shows another transversal sectional view III-III of a part of the motor stator of figures 1 and 2
  • figure 4 shows a plastic end cap and a perspective view.
  • the figures show a high voltage motor stator 10 for a system voltage of, for example 400 V for an electric high voltage motor with a typical electric performance of 2 kWh.
  • the high-voltage motor stator 10 comprises a back iron arrangement 20 with six radial stator tooth bodies 22 which define, seen in circumferential direction, six radial stator slots 24 between the stator tooth bodies 22.
  • the back iron arrangement 20 comprises a separate back iron ring 29 connecting the outside end portions of the six stator tooth bodies 22 with each other.
  • the substantially cylindrical inside surface of the back iron ring 29 defines the slot bottom surfaces 25 of the six stator slots 24.
  • the motor stator 10 has a substantially cylindrical configuration with respect to a longitudinal stator axis A.
  • stator teeth bodies 22 are provided with pole shoes 23 which are connected to each other in circumferential direction by material bridges having a very small cross-section.
  • the stator tooth bodies 22 and the back iron ring 29 each are defined by packages of many metal sheets.
  • Every stator tooth body 22 is electrically isolated by a plastic tooth isolating sleeve 30 completely surrounding the stator tooth body 22 and covering the pole shoe 23 with a pole shoe cover 23'.
  • Every tooth isolating sleeve 30 also defines a ring-like sleeve collar 34 at the radially distal sleeve end 26, as shown in figure 1.
  • the lateral extension of the sleeve collar 34 referring to the isolating sleeve 30 is 5 mm.
  • the radially distal side of the sleeve collar 34 is not in direct contact with the proximal surface of the slit bottom surface 25 but has a radial distance rlOO of, for example, 0.5 to 3 mm.
  • the sleeve collar 34 and the slot bottom surface 25 of the back iron ring 29 together define twelve tangential isolation slits 100 which have a tangential depth tlOO of 5 mm.
  • the tooth isolating sleeves 30 each are surrounded by an electromagnetic pole coil 40 being arranged radially between the sleeve collar 34 and the pole shoe cover 23'.
  • Each pole coil 40 is defined by a coil wire.
  • the six pole coils 40 are electrically connected with each other in three phases and in a triangular structure or in a star structure.
  • the motor stator 10 comprises two separate plastic end caps 50, 50' arranged at both axial ends 21, 21' of the back iron arrangement 20 and axially substantially covering the pole coils 40.
  • the plastic end caps 50, 50' both are provided with six sheet holding structures 52 holding six slot isolation sheets 60 axially and radially in position.
  • the slot isolation sheet 60 is defined by an electrically isolating sheet body material.
  • Each holding structure 52 is provided with three small axial holding slits 54 to which axial end portions 61, 61' of the slot insulation sheets 60 are inserted, as in particular shown in figures 2 and 3.
  • the three axial holding slits 54 of each holding structure 52 are defined by three axial holding noses 53, which holding noses 53 restrict the inward movement of the axial end portions 61, 61' of the slot insulation sheets 60.
  • Each holding structure 52 is provided with tangential slit walls 51 extending radially inwardly from the cylindrical cap body and which define the tangential extend in circumferential direction of each holding structure 52.
  • each holding structure 52 defines the spatial position of every and portion 61, 60 one' of every slot insulation sheet 60 in both tangential (circumferential), in both radial and in one axial direction.
  • the axial length x60 of the slot isolation sheet 60 is 30% greater than the axial extend x40 of the corresponding electromagnetic pole coil 40.
  • the axial holding slits 54 have, seen in axial direction, are parallel to the cylindrical slot bottom surfaces 25 of the back iron ring 29.
  • the sheet holding structures 52 of the end caps 50, 50' are located axially outside of the stator slots 24 and do not project into the stator slots 24.
  • the end caps 50, 50' are directly fixed at the tooth isolating sleeves 30 by a snap-on connection, or by any other suitable connection.
  • the end caps 50, 50' both are provided with six axial cooling fluid openings 55, each of them being axially in-line with the stator slots 24.
  • a separate cylindrical slit tube 110 is provided at the radial inside of the pole shoes 23.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Iron Core Of Rotating Electric Machines (AREA)
  • Insulation, Fastening Of Motor, Generator Windings (AREA)

Abstract

L'invention concerne un stator de moteur haute tension (10) comprenant un agencement en fer arrière (20) avec plusieurs corps de dent de stator radiaux (22) définissant des fentes de stator radiales (24) entre les corps de dent de stator (22), et avec un anneau en fer arrière (29) reliant tous les corps de dent de stator (22) les uns aux autres, des manchons d'isolation de dent en plastique (30) isolant électriquement chaque corps de dent de stator (22), des bobines de pôle électromagnétique (40) entourant chacune l'un des manchons d'isolation de dent (30), deux capuchons d'extrémité en plastique séparés (50, 50') étant fixés aux deux extrémités axiales (21, 21') de l'agencement en fer arrière (20) et recouvrant axialement les bobines de pôle (40), une feuille d'isolation de fente (60) disposée dans chaque fente de stator (24) au niveau de la surface inférieure de fente (25) de la fente de stator (24), respectivement, les capuchons d'extrémité en plastique (50, 50') étant pourvus de structures de support de feuille (52), respectivement, pour maintenir les feuilles d'isolation de fente (60) en position.
PCT/EP2023/077598 2023-10-05 2023-10-05 Stator de moteur haute tension Pending WO2025073369A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PCT/EP2023/077598 WO2025073369A1 (fr) 2023-10-05 2023-10-05 Stator de moteur haute tension

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/EP2023/077598 WO2025073369A1 (fr) 2023-10-05 2023-10-05 Stator de moteur haute tension

Publications (1)

Publication Number Publication Date
WO2025073369A1 true WO2025073369A1 (fr) 2025-04-10

Family

ID=88316018

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2023/077598 Pending WO2025073369A1 (fr) 2023-10-05 2023-10-05 Stator de moteur haute tension

Country Status (1)

Country Link
WO (1) WO2025073369A1 (fr)

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1145544A (zh) * 1995-06-07 1997-03-19 松下电器产业株式会社 电机定子及其制作方法
EP1499000A1 (fr) * 2003-07-12 2005-01-19 Grundfos a/s Stator segmenté
JP3725469B2 (ja) * 2001-12-26 2005-12-14 タカノ株式会社 コイルの電気絶縁構造
WO2010100890A1 (fr) * 2009-03-06 2010-09-10 三菱電機株式会社 Induit destiné à un moteur
DE112013005061T5 (de) 2012-10-19 2015-07-02 Nidec Corporation Statoreinheit und Motor
US20200052556A1 (en) 2017-04-19 2020-02-13 Autel Robotics Co., Ltd. Electric-motor heat dissipation member, electric motor and aircraft
US20200366173A1 (en) * 2019-05-14 2020-11-19 Hanon Systems Combined uhv insulation system
DE102009024991B4 (de) 2009-06-16 2022-01-13 Vorwerk & Co. Interholding Gmbh Elektromotor sowie Verfahren zur Montage eines Elektromotors
DE102020131413A1 (de) 2020-11-26 2022-06-02 Nidec Motors & Actuators (Germany) Gmbh Elektromotor mit Bajonettverschluss zwischen Lagerschild und Sammelschieneneinheit

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1145544A (zh) * 1995-06-07 1997-03-19 松下电器产业株式会社 电机定子及其制作方法
JP3725469B2 (ja) * 2001-12-26 2005-12-14 タカノ株式会社 コイルの電気絶縁構造
EP1499000A1 (fr) * 2003-07-12 2005-01-19 Grundfos a/s Stator segmenté
WO2010100890A1 (fr) * 2009-03-06 2010-09-10 三菱電機株式会社 Induit destiné à un moteur
DE102009024991B4 (de) 2009-06-16 2022-01-13 Vorwerk & Co. Interholding Gmbh Elektromotor sowie Verfahren zur Montage eines Elektromotors
DE112013005061T5 (de) 2012-10-19 2015-07-02 Nidec Corporation Statoreinheit und Motor
US20200052556A1 (en) 2017-04-19 2020-02-13 Autel Robotics Co., Ltd. Electric-motor heat dissipation member, electric motor and aircraft
US20200366173A1 (en) * 2019-05-14 2020-11-19 Hanon Systems Combined uhv insulation system
DE102020131413A1 (de) 2020-11-26 2022-06-02 Nidec Motors & Actuators (Germany) Gmbh Elektromotor mit Bajonettverschluss zwischen Lagerschild und Sammelschieneneinheit

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