WO2014184518A2 - Stator - Google Patents

Stator Download PDF

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Publication number
WO2014184518A2
WO2014184518A2 PCT/GB2014/051285 GB2014051285W WO2014184518A2 WO 2014184518 A2 WO2014184518 A2 WO 2014184518A2 GB 2014051285 W GB2014051285 W GB 2014051285W WO 2014184518 A2 WO2014184518 A2 WO 2014184518A2
Authority
WO
WIPO (PCT)
Prior art keywords
stator
stator module
module
coils
blade
Prior art date
Application number
PCT/GB2014/051285
Other languages
English (en)
Other versions
WO2014184518A3 (fr
Inventor
Hanczewski PAWEL
Original Assignee
Ngentec Ltd
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 Ngentec Ltd filed Critical Ngentec Ltd
Publication of WO2014184518A2 publication Critical patent/WO2014184518A2/fr
Publication of WO2014184518A3 publication Critical patent/WO2014184518A3/fr

Links

Classifications

    • 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
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K9/00—Arrangements for cooling or ventilating
    • H02K9/19—Arrangements for cooling or ventilating for machines with closed casing and closed-circuit cooling using a liquid cooling medium, e.g. oil
    • H02K9/197—Arrangements for cooling or ventilating for machines with closed casing and closed-circuit cooling using a liquid cooling medium, e.g. oil in which the rotor or stator space is fluid-tight, e.g. to provide for different cooling media for rotor and stator
    • 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
    • H02K3/47—Air-gap windings, i.e. iron-free windings
    • 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
    • H02K5/22—Auxiliary parts of casings not covered by groups H02K5/06-H02K5/20, e.g. shaped to form connection boxes or terminal boxes
    • H02K5/225—Terminal boxes or connection arrangements
    • 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
    • H02K2213/12—Machines characterised by the modularity of some components

Definitions

  • This disclosure relates to the field of electrical machines, such as motors and generators.
  • Multi-stage axial flux machines and methods of assembly thereof are disclosed herein.
  • Embodiments of axial flux machines to be particularly described hereinafter with reference to the accompanying drawings have air cored windings.
  • the axial flux machines have direct gas or liquid cooling on the stator winding.
  • a modular assembly for such machines is disclosed.
  • the present disclosure focuses on rotary motion machines, but aspects of the disclosed embodiments are also applicable to linear motion machines wherein, instead of a rotor, an oscillator is mounted for relative movement with respect to a stator.
  • a stator module for a multi-stage axial flux machine comprises a number of stator blades connected in a mutually spaced stacked relationship to form a stator blade assembly having an air gap between the respective blades.
  • Such a stator blade assembly is suitable for juxtaposition with a corresponding rotor plate assembly wherein spaced apart plates of the rotor assembly are received in the respective air gaps to form an operational configuration for use in an electrical machine.
  • the stator modules are suitable for assembly of a multi-phase electrical machine.
  • the rotor plate assembly may be a permanent magnet rotor assembly with at least one permanent magnet secured to a surface of each plate of the rotor plate assembly with an air gap between confronting surfaces with secured magnets, said air gap being to receive a blade of a stator and allow relative movement between the rotor plate assembly and the stator blade assembly.
  • stator module herein is not intended to imply any particular orientation of the stator module of this disclosure, and the stator module to be described more fully hereinafter may be used in any orientation.
  • a stator blade may provide n coils for a multiphase electrical machine, where n is any integer.
  • a stator blade may contain several air-cored coils supported by non-conductive spreader plates, and impregnated with a resin material or encapsulating compound.
  • Each air-cored coil may be a simple concentrated coil.
  • a required number of the air- cored coils are juxtaposed in the same plane and may be embedded in a curable resin such as epoxy or polyurethane, or cast into any suitable encapsulation compound to provide a shape-retaining structural blade form which can be handled and assembled with other components.
  • each stator module contains a stack of multiple blades and each blade may have at least three coils embedded within the blade.
  • a stator blade may be configured as a sector or truncated sector of a disc, and multiple truncated sector blades positioned in a spaced stacked relationship may provide a stator module.
  • Multiple like-shaped stator modules for example 4, 5, or 6, may be juxtaposed in the same plane to form a stator modular assembly (in this case, of generally cylindrical form being formed of a stack of closely spaced disc-shaped blade assemblies].
  • a stator module has a plurality of stacked blades each comprising coils, wherein the respective phase coils of stacked blades in a stator module are connected electrically in series from one blade to the next so that in a rotary machine, the respective coils are electrically connected axially across the stacked coils of the stator module (with respect to the axis of rotation of the corresponding rotor].
  • each plate comprises at least 3 coils, with each of the coils in a plate representing a different phase, then then p u , p v and p w coils in the stator module provide a 3-phase (U, V W] modular machine (or p a p y and p z for a 3-phase X, Y, Z depending upon usage].
  • Such an arrangement of blade to blade electrical series connection of the respective coils provides a uniquely serviceable machine since it is possible to remove one, or possibly more stator modules depending upon the size of the machine for maintenance, without disconnecting the other modules. This capability at least leaves a machine with a reduced operational capacity if it is not immediately possible to replace the module requiring maintenance.
  • air-cored coils may be used as a matter of preference since this facilitates manufacture and reduces handling difficulties during assembly due to the lack of magnetic attraction forces between the stator and rotor (normally encountered with iron-cored coils].
  • the flux flows parallel to the shaft axis.
  • Axial flux machines can be more compact than a correspondingly rated radial flux machine.
  • the present disclosure provides a distinct technical improvement Even if such a circumferentially connected stator disc is assembled from connectable modules, removal of one module renders that entire stage of the machine inoperable, and always requires a substitute module to be inserted to maintain operational capacity.
  • the stator module is provided with a dedicated cooling system allowing introduction of a cooling fluid.
  • the cooling fluid may be circulated around the stator module and removed in a cycle to maintain an operationally acceptable temperature for the stator module.
  • a dedicated, discrete cooled terminal box may be removably attached to the peripheral edge of the stator module by flanges and bolts.
  • a dedicated, discrete cooled terminal box may be integrated with a peripheral edge of the stator module.
  • a dedicated, discrete cooling system with fully integrated heat exchanger may be provided for each stator module, whereby each such cooling system may be operated independently of the other cooling systems for respective identical modules.
  • each stator module is an independent unit Embodiments may have discrete terminal boxes for coolant, and dedicated electrical connections, permitting each stator module to be self-contained.
  • the respective stator modules may each comprise sensors, electrical connections, cooling heat exchanger and terminal box. Therefore, removal of a stator module will not prevent the electrical machine remaining operational at a reduced capacity with the remaining modular components.
  • the cooling fluid for any embodiment may be gaseous, for example, inert gas, air, or a mixture thereof, or a suitable heat transfer liquid, for example water, or an aqueous fluid, or an oil-based coolant, or combinations of such fluids.
  • the circulation path for the cooling fluid is formed by at least one tubular conduit with associated heat transfer surfaces for dissipating heat generated by the coils.
  • the length of tubular conduit can be confined in a compact volume by return loops.
  • the tubular conduit may be fixed within a matrix of cooling fins.
  • the circulation path for the cooling fluid extends between successive stator plates in the stator module so that the circulating cooling fluid cools the module as a whole and is isolatable from other stator modules in the machine.
  • the cooling fluid is transferred in the axial direction between stator blades for cooling each stator blade successively.
  • Fig. 1 is a side view of a circular stator formed from five circumferentially connected stator modules each with three coils to form a stator stage of an electrical machine with three-phase electrical power capacity;
  • Fig. 2 is a perspective view of a circular stator formed from five axially connected stator modules each with three sets of four axially connected coils to provide three- phase capacity in a rotary electrical machine;
  • Fig. 3 is a perspective view of a stator module formed from three sets of four axially connected coils to provide three-phase capacity;
  • Fig. 4 is a circumferential edge view in the plane of the stator blades of the stator module shown in Fig. 3;
  • Fig. 5 is a perspective view of the stator module shown in Fig. 3 with cooling system and terminal box mounted;
  • Fig. 6 is a perspective view of a stator module with embedded coils, cooling/heat exchange system, mechanical support and connections for coolant, power and auxiliary systems. Description of Embodiments
  • a stator stage 1 of a previously developed rotary electrical machine has five arcuate modular sections 11 together forming a circular mounting for three phase coils 13, 15, 17 (shown un-potted i.e. free of curable resin or encapsulating compound which would contribute to the structural form of the blade, for explanatory purposes only) to be incorporated within a stator blade.
  • Electrical connection 19 for the coils is arranged circumferentially, and for clarity, only the electrical input and return connection for the first series of coils 13 (U-phase) is represented (Ui, to U 2 ,).
  • a phase consists of five circumferentially mounted coils 13, and a three phase machine is obtainable by similarly circumferentially connecting respectively the coils 15, and separately, the coils 17.
  • the assembled disc consisting of five modular section stator blades together with a corresponding rotor represents a single stage of the intended electrical machine. If a single arcuate modular section 11 is removed, the electrical circuit in the stage is interrupted and the stage is disabled until a replacement modular section 11 is installed.
  • a stator stage 2 for a rotary electrical machine has five arcuate modular sections 21 which when assembled together are capable of forming a circular mounting for a plurality of coils 23, 25, 27 (shown free of resin or encapsulation compound for explanatory purposes only) to be incorporated within a stator blade.
  • Embodiments of the blade may comprise a thermally-conductive spreader plate which is electrically non-conductive, and associated with the coils 23, 25, 27 for dissipating heat from the coils 23, 25, 27.
  • the coils 23, 25, 27 may be embedded in a resin or encapsulation compound.
  • Similar series coils 23 1 , 25 1 , 27 1 ; and 23 2 , 25 2 , 27 2 ; and 23 3 , 25 3 , 27 3 are juxtaposed in successive neighbouring blades in a stacked relationship to provide an isolatable stator module 22 suitable for a three-phase (U, V, W] machine. Electrical connections 29 to connect the respective phase coils in series are made across the stator module 22 between four neighbouring blades (Figs. 3, 4).
  • a stator blade for such a machine is configured as a sector or truncated sector of a disc, and multiple truncated sector blades can be positioned in a spaced stacked relationship to provide a stator module 22.
  • Multiple like-shaped stator modules 22, for example four, five, or six, may be juxtaposed in the same plane to form a stator modular assembly 30 (in this case, of overall substantially cylindrical form]. Higher numbers can be contemplated but up to eight is suitable for most purposes.
  • Fig. 3 The electrical connections for a three-phase generator are shown in Fig. 3 in an enlarged view, in comparison with Fig. 2, of a stator module formed from three sets of four serially connected coils, the connections in and return being shown as Ui, to U 2 , Vi to V 2 , Wi to W 2 , respectively.
  • the electrical connection crosses the stator module to link coils in series axially in succession from one blade to the next (Fig. 4).
  • each axially connected stator module acts like an individual machine, and so removal of such a module does not disable similar modules making up the stator modular assembly enabling continued operational capability but at a proportionately reduced capacity.
  • a phase consists of four axially-mounted coils connected together, the connection crossing from blade to blade to connect the respective coils in the stack in a single phase.
  • a phase consists of five circumferentially mounted coils.
  • the complete module shown in Figure 2 would produce a three- phase output, and so could be considered as an independent unit (generator), in the same way as a single stage in Figure 1.
  • generator generator
  • the stator module 22 is provided with a cooled terminal box 50, provided with coolant inlet 51, coolant outlet 53, with heat transfer surfaces 55 incorporated in the terminal box and fastener flanges 57, 59 for receiving bolts for attaching the cooled terminal box 50 to the outer or peripheral edge of the stator module 22.
  • a stator module 32 is provided with a cooling system comprising a heat exchanger 60 and a support casing section 67.
  • the stator module comprises three phase coils 33, 35, 37 embedded within a stator blade.
  • the stator module of this embodiment is provided with coolant connection ports 61, 63, and connection terminals 39 for power and auxiliary systems.
  • the connection ports 61, 63 and connection terminals 39 are mounted so as to be accessible at the outer or peripheral edge of the stator module 32.
  • An outer support casing section 67 is equipped with lifting eyes 68 to facilitate handling of the stator module.
  • WO 2008/091035 proposes liquid cooling of a multistage axial flux machine with air-cored windings.
  • a cooling system is described in which the stator coils are inserted into sealed units through which the fluid passes.
  • Each stage consists of a single unit - i.e. there are no individual modules within a stage, so there is only a single inlet pipe and a single outlet pipe for cooling of each stage.
  • the present disclosure solves the above problems by an improved assembly in which the coils are connected as shown in an embodiment in Fig 2.
  • the complete machine would then be made up of a number of such axial independent units.
  • Each axial unit can have its own integrated and independent cooling system as illustrated in Fig. 5.
  • the cooling system has the same axial modularity and is inherently integrated with a stage (Fig. 5), permitting less connections and enabling reduced risk of leakage.
  • Stator blades are connected electrically in series from one phase coil to the next in the other stages (blades) in axial direction, whereby each stator module represents an independent three-phase generator
  • the axial modularity improves overall serviceability by creating fully modular stator modules fitted with a dedicated part of the cooling system and also a separate terminal box. Unlike the previously discussed WO 2008/091035 it makes the module self-contained, separate 3 phase machine, able to operate independently of the other modules
  • the proposed design is contemplated as being more suitable for medium speed rather than direct drive with a low number of modules (low means here up to twelve) around the stator.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Motor Or Generator Cooling System (AREA)

Abstract

L'invention se rapporte à un module de stator (21) pour une machine électrique multiphasée. Le module de stator comprend une pluralité de pales de stator assemblées ensemble dans une disposition axiale côte à côte avec un espace d'air entre des pales adjacentes. Chaque pale de stator comprend de multiples bobines (23, 25, 27) qui peuvent être intégrées dans une résine ou un composé d'encapsulation. Une bobine (23) dans une pale de stator est raccordée électriquement à une bobine correspondante (23') dans une pale de stator adjacente afin de fournir une phase électrique. Des modules de stator (21) peuvent être juxtaposés dans le même plan afin de former un ensemble modulaire de stator (30). Chaque module de stator comprend un système de refroidissement indépendant (50, Figure 5). De façon avantageuse, si une bobine (23, 25, 27) ou un système de refroidissement tombe en panne, tout un module de stator (21) peut être alors retiré sans affecter le fonctionnement des modules de stator restants agencés dans une machine électrique multiphasée.
PCT/GB2014/051285 2013-05-16 2014-04-25 Stator WO2014184518A2 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB1308863.8 2013-05-16
GB201308863A GB201308863D0 (en) 2013-05-16 2013-05-16 Stator

Publications (2)

Publication Number Publication Date
WO2014184518A2 true WO2014184518A2 (fr) 2014-11-20
WO2014184518A3 WO2014184518A3 (fr) 2015-06-25

Family

ID=48746877

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/GB2014/051285 WO2014184518A2 (fr) 2013-05-16 2014-04-25 Stator

Country Status (2)

Country Link
GB (1) GB201308863D0 (fr)
WO (1) WO2014184518A2 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11670977B2 (en) 2019-04-24 2023-06-06 Black & Decker Inc. Outer rotor brushless motor stator mount

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2008091035A1 (fr) 2007-01-25 2008-07-31 Tae Chang N.E.T. Co., Ltd. Moteur et multigénérateur sans noyau à aimants permanents à flux axial (afpm)
US8040011B2 (en) 2006-03-16 2011-10-18 The University Court Of The University Of Edinburgh Generator and magnetic flux conducting unit
US8339009B2 (en) 2007-09-12 2012-12-25 Ngentec Ltd. Magnetic flux conducting unit

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GB736701A (en) * 1952-10-03 1955-09-14 English Electric Co Ltd Improvements in and relating to salient pole field systems for dynamo electric machines
DE949416C (de) * 1953-11-06 1956-09-20 Chicago Pneumatic Tool Co Verfahren zur Herstellung eines mehr als ein ausgepraegtes Polpaar aufweisenden Statoraufbaues elektrischer Maschinen
JPS60128838A (ja) * 1983-12-13 1985-07-09 Matsushita Electric Ind Co Ltd 軸方向空隙型誘導電動機
DE102006010540A1 (de) * 2006-03-07 2007-09-13 Siemens Ag Elektromotor
IT1392107B1 (it) * 2008-11-28 2012-02-09 Lucchi Parte statorica di macchina elettrica a flusso assiale con sistema di raffreddamento a liquido.
US8193678B2 (en) * 2009-09-07 2012-06-05 Sunonwealth Electric Machine Industry Co., Ltd. Coil unit for motor stator
DE102010036828A1 (de) * 2010-08-04 2012-02-09 Friedrich Waltermann Stator für elektrische Maschine mit überlappenden U-förmigen Kernblechen

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8040011B2 (en) 2006-03-16 2011-10-18 The University Court Of The University Of Edinburgh Generator and magnetic flux conducting unit
WO2008091035A1 (fr) 2007-01-25 2008-07-31 Tae Chang N.E.T. Co., Ltd. Moteur et multigénérateur sans noyau à aimants permanents à flux axial (afpm)
US8339009B2 (en) 2007-09-12 2012-12-25 Ngentec Ltd. Magnetic flux conducting unit

Non-Patent Citations (4)

* Cited by examiner, † Cited by third party
Title
A.S. MCDONALD ET AL.: "1MW Multi-stage Air-Cored Permanent Magnet Generator for Wind Turbines", 6TH IET INTERNATIONAL CONFERENCE ON POWER ELECTRONICS, MACHINES AND DRIVES, 2012
A.S. MCDONALD: "Journal of Wind Energy", vol. 12, 2009, WILEY, article "A Lightweight Low Speed Permanent Magnet Electrical Generator For Direct-Drive Wind Turbines"
AS MCDONALD: "Structural analysis of low speed, high torque electrical generators for direct drive renewable energy converters", PHD DISSERTATION, SCHOOL OF ENGINEERING, 2008
M MUELLER ET AL.: "A Multi-stage Axial Flux Permanent Magnet Machine for Direct Drive Wind Turbines", 1ST IET RENEWABLE POWER GENERATION CONFERENCE, 2011

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11670977B2 (en) 2019-04-24 2023-06-06 Black & Decker Inc. Outer rotor brushless motor stator mount
US11973374B2 (en) 2019-04-24 2024-04-30 Black & Decker Inc. Outer rotor brushless motor having an axial fan

Also Published As

Publication number Publication date
GB201308863D0 (en) 2013-07-03
WO2014184518A3 (fr) 2015-06-25

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