WO2017161527A1 - Stratification de stator et machine électrique - Google Patents

Stratification de stator et machine électrique Download PDF

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Publication number
WO2017161527A1
WO2017161527A1 PCT/CN2016/077186 CN2016077186W WO2017161527A1 WO 2017161527 A1 WO2017161527 A1 WO 2017161527A1 CN 2016077186 W CN2016077186 W CN 2016077186W WO 2017161527 A1 WO2017161527 A1 WO 2017161527A1
Authority
WO
WIPO (PCT)
Prior art keywords
stator
electrical machine
sub
stator core
slots
Prior art date
Application number
PCT/CN2016/077186
Other languages
English (en)
Inventor
Tao Zhu
Shi Deng
Bastian Vogt
Xinhua Liu
Original Assignee
Robert Bosch 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 Robert Bosch Gmbh filed Critical Robert Bosch Gmbh
Priority to PCT/CN2016/077186 priority Critical patent/WO2017161527A1/fr
Priority to PCT/CN2016/087056 priority patent/WO2017161721A1/fr
Publication of WO2017161527A1 publication Critical patent/WO2017161527A1/fr

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Classifications

    • 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
    • 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
    • H02K1/20—Stationary parts of the magnetic circuit with channels or ducts for flow of cooling medium
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K9/00—Arrangements for cooling or ventilating
    • H02K9/14—Arrangements for cooling or ventilating wherein gaseous cooling medium circulates between the machine casing and a surrounding mantle
    • H02K9/16—Arrangements for cooling or ventilating wherein gaseous cooling medium circulates between the machine casing and a surrounding mantle wherein the cooling medium circulates through ducts or tubes within the casing

Definitions

  • the present invention relates generally to the field of electrical machines, which includes electrical motors and generators. More particularly, the present invention relates to the dissipation of heat in such electrical machines.
  • the electrical machines are commonly used in industrial, commercial, and consumer settings. In industry, such machines are employed to drive various kinds of devices, including pumps, conveyors, compressors, fans, and so forth, to mention only a few.
  • the electrical machines generally include a stator surrounding a rotor and comprising a multiplicity of stator windings. By establishing an electromagnetic relationship between the rotor and the stator, electrical energy can be converted into kinetic energy, and vice-versa.
  • conventional motors and generators produce heat. If left unabated, excess heat may degrade the performance of the electrical machine, reducing efficacy, for instance. Worst yet, excess heat may contribute to any number of malfunctions, leading to system down time and, in certain instances, requiring maintenance and/or replacement. Undeniably, reduced efficacy and increased malfunctions are undesirable events that may lead to increased costs.
  • the stator core assembly is housed within a frame assembly having fins formed thereon.
  • the frame assembly forms an intermediate structure between the stator core assembly and the surrounding environment.
  • the intermediate structure decreases the efficacy of convective cooling techniques.
  • US2006/0284511 provides an electrical machine comprising a stator core assembly that is formed of a plurality of stator laminations and that is, at least partially, an outer surface of the motor.
  • Each stator lamination has a plurality of fins that extend radially outward. When assembled, the fins of adjacent laminations cooperate to form a plurality of fin sections extending the length of the stator core assembly.
  • the present invention provides a stator lamination for forming a stator core and an electrical machine which considerably improve the cooling efficacy of the electrical machine.
  • the present invention provides a stator lamination for forming a stator core of an electrical machine, comprising:
  • a central aperture formed in the body and sized to receive a rotor of the electrical machine
  • a series of closed openings disposed about the series of slots and formed in the body, each configured to allow the airflow to pass through, and a wall between the adjacent closed openings forming a fin which extends radially outward with respect to the central aperture.
  • the present invention also provides an electrical machine, comprising:
  • stator core at least partially defining an outer surface of the electrical machine, the stator core comprising a central chamber that extends axially thought the stator core, a plurality of winding slots that are disposed about the central chamber and extend axially through the stator core, and a plurality of airflow passages that are disposed about the winding slots and extend axially through the stator core;
  • stator core a first end cap and a second end cap disposed at opposite ends of the stator core
  • a rotor located within the central chamber and fixedly mounted on a shaft rotatably supported by the first end cap and the second end cap;
  • a fan disposed outside either of the first end cap and the second end cap to urge a cooling airflow to pass through the airflow passages.
  • FIG. 1 is a perspective view showing schematically an electrical machine according to an exemplary embodiment of the present invention
  • FIG. 2 is another perspective view of the electrical machine of FIG. 1;
  • FIG. 3 is an axial cross-sectional perspective view of the electrical machine of FIG. 1, in which the electrical machine includes a stator core according to a first exemplary embodiment of the present invention
  • FIG. 4 is a perspective view showing the stator core of the electrical machine of FIG. 3;
  • FIG. 5 is an exploded perspective view of a series of adjacent stator laminations forming the stator core of FIG. 4;
  • FIG. 6 is an axial cross-sectional view of the electrical machine of FIG. 3, in which the arrows A show the flow of the cooling airflow;
  • FIG. 7 is a perspective view showing a stator core according to a second exemplary embodiment of the present invention.
  • FIG. 8 is a partial side view of the stator core of FIG. 7;
  • FIG. 9 is a perspective view showing a stator core according to a third exemplary embodiment of the present invention.
  • FIG. 10 is a perspective view similar to FIG. 9, in which the stator core is partially cut off to show arrangement of fin sub-sections;
  • FIG. 11 is a perspective view showing four stator sub-cores forming the stator core of FIG. 9.
  • FIG. 1 is a perspective view showing schematically an electrical machine according to an exemplary embodiment of the present invention
  • FIG. 2 is another perspective view of the electrical machine of FIG. 1
  • FIG. 3 is an axial cross-sectional perspective view of the electrical machine of FIG. 1.
  • an exemplary electrical machine 1 according to the present invention is envisaged as an induction motor.
  • the present invention is applicable to any electrical machines, including electrical motors and electrical generators.
  • the present invention is equally applicable to DC electrical machines.
  • devices in which the rotor′s magnetic flux is produced as a result of the material employed and not by induction also benefit from the present invention.
  • the exemplary electrical machine 1 includes a stator core 3 capped at both ends by a first end cap 5 and a second end cap 7, respectively.
  • the exemplary first end cap 5 and second end cap 7 may include mounting and transportation features (not shown) as well as heat dissipation features, such as the end cap cooling fins 9, 11.
  • the first end cap 5 and the second end cap 7 and the stator core 3 are maintained in assembly by through-bolts 13 extending axially through the first end cap 5 and the second end cap 7 and the stator core 3. The tight fit and close tolerances between the assembled stator core 3 and the first and second end caps 5 and 7 prevent the ingress of containments into the interior of the electrical machine 1.
  • the exemplary first and second end caps 5 and 7 and stator core 3 cooperate to present an assembly that is resistant to, but not sealed from the ingress of contaminants.
  • a sealing pad may be disposed between the stator core 3 and the first end cap 5 as well as the stator core 3 and the second end cap 7.
  • the outer surface of the stator core 3 may be coated with resin to further improve the water-tightness of the electrical machine 1.
  • the exemplary electrical machine 1 further includes a shaft 15 rotatably supported by a first bearing 17 disposed in the first end cap 5 and a second bearing 19 disposed in the second end cap 7 as well as a rotor 21 fixedly mounted on the shaft 15 and located within a central chamber 23 defined by the stator core 3.
  • a rotor 21 fixedly mounted on the shaft 15 and located within a central chamber 23 defined by the stator core 3.
  • alternating current is routed through stator windings 25 disposed in the stator core 3.
  • the stator windings 25, of which only the end turns are shown in FIG. 3, are electrically interconnected to form groups that are, in turn, interconnected in a manner generally known in the pertinent art.
  • stator windings 25 are further coupled to terminal leads 27 that electrically connect the stator windings 25 to an external power source (not shown) . Routing electrical current from the external power source through the stator windings 25 creates electromagnetic relationships with the rotor 21 that cause rotation of the rotor 21, as is appreciated by those of ordinary skill in the art.
  • the shaft 15 coupled to the rotor 21 also rotates in response to rotation of the rotor 21. Through the shaft 15, torque may be transmitted to any number of drive machine elements.
  • FIG. 4 is a perspective view showing the stator core of the electrical machine of FIG. 3 and FIG. 5 is an exploded perspective view of a series of adjacent stator laminations forming the stator core of FIG. 4.
  • the stator core 3 comprises a plurality of stator laminations 29 aligned and assembled with respect to one another to form the contiguous stator core 3.
  • Each stator lamination 29 includes a generally circular body 30.
  • a central aperture 31 is formed in the body 30 and sized to receive the rotor 21.
  • Disposed about this central aperture 31 and formed in the body 30 are a series of slots 33, each configured to hold an incremental portion of the stator winding 25.
  • the slots 33 and the central aperture 31 essentially define the inner periphery 35 of the stator lamination 29.
  • Disposed about the series of slots 33 and formed in the body 30 are a series of closed openings 37, each configured to allow the airflow to pass through.
  • a wall between the adjacent closed openings 37 forms a fin 39 that extends radially outward with respect to the this central aperture 31 or the series of slots 33.
  • Each stator lamination 29 also includes through-bolt receiving apertures 41 disposed about the series of slots 33.
  • stator lamination 29 is shown to have a generally circular shape, it may have generally square, rectangular or any other suitable shape.
  • Such stator laminations 29 can be fabricated via a stamping process, in which a material blank is stamped to produce the desired stator lamination.
  • stator laminations 29 When assembled, the stator laminations 29 cooperate to present a number of features and attributes.
  • the stator laminations 29 cooperate to define the central chamber 23 that extends axially thought the stator core 3 and in which the rotor 21 resides.
  • These stator laminations 29 also cooperate to define winding slots 43 that are formed by the series of slots 33 and extend axially through the stator core 3 and that are configured to hold the sets of stator windings 25.
  • these stator laminations 29 also cooperate to define a plurality of airflow passages 45 that are formed by the series of closed openings 37 and extend axially through the stator core 3 and that are configured to allow the airflow to pass through the stator core 3.
  • the airflow passages 45 are opened only at two ends.
  • stator laminations 29 cooperate to form cumulative fin sections 47 that extend the length of the stator core 3.
  • stator laminations 29 also cooperate to define continuous through-bolt receiving apertures 49 that are formed by the through-bolt receiving apertures 41 and extend axially through the stator core 3 and that are configured to receive the through-bolts 13.
  • the exemplary electrical machine 1 includes a fan 51 disposed outside of the second end cap 7. It should be understood that the fan 51 may be disposed outside of the first end cap 5.
  • the fan 51 is used to urge the airflow to pass through the airflow passages 45 formed in the stator core 3.
  • a first hollowed-out region53 is formed in the first end cap 5 and a second hollowed-out region 55 is formed in the second end cap 7 so that the cooling airflow driven by the fan 51 flows through the second end cap 7, the airflow passages 45 and the first end cap 5 into the surrounding environment.
  • first through-holes and a series of second through-holes which are aligned with the respective airflow passages 45 are formed in the first end cap 5 and the second end cap 7.
  • Disposed about the fan 51 is a shroud 57 in which a plurality of vents 59 is formed.
  • the shroud 57 directs airflow drawn in through the vents 59 toward the fan 51, thus directing the airflow to pass through the second end cap 7, the stator core 3 and the first end cap 5, to cool the electrical machine 1.
  • the fan 51 may be mounted on the shaft 15 and rotates together with the shaft 15, it is preferable that the fan 51 is driven by a separate electrical motor 61 whose speed can be controlled according to the operating condition of the electrical machine 1.
  • FIG. 6 is an axial cross-sectional view of the electrical machine of FIG. 3, in which the arrows A show the flow of the cooling airflow.
  • the stator core 3 at least partially defines an external surface of the electrical machine 1.
  • the fan 51 rotates, the fan 51 directs the cooling airflow to pass through the second end cap 7, the stator core 3 and the first end cap 5 to conduct heat exchange with the fin section 47 of the stator core 3.
  • there is no intermediate structure such as a frame assembly between the stator core 3 and the surrounding environment, some heat is dissipated directly into the surrounding environment from the external surface of the stator core 3.
  • stator core 3 heat exchange occurs between the stator core 3 and the cooling airflow passing through the airflow passages 45 so that the whole stator core 3 can be cooled evenly and effectively.
  • present invention considerably improves the efficacy of cooling for dissipating heat generated in the electrical machine 1 during operation.
  • FIG. 7 is a perspective view showing a stator core according to a second exemplary embodiment of the present invention and FIG. 8 is a partial side view of the stator core of FIG. 7.
  • the stator core 3 according to the second exemplary embodiment of the present invention is similar substantially to that shown in FIG 4 except the further fin sections formed on the fin sections. For the sack of simplification and conciseness, the detailed explanation for the identical or similar components is omitted.
  • the stator core 3 according to the second exemplary embodiment of the present invention further includes a plurality of further fin sections 63 extending from the fin sections 47 between adjacent the airflow passages 45 along the length of the stator core 3.
  • the effective area for heat exchange with the cooling airflow passing through the airflow passages 45 is considerably increased. As a result, it is possible to allow more effective heat removal from the stator core without increasing the size of the stator core.
  • the further fin sections 63 is shown to be flat and extend perpendicularly from the fin sections 47, it should be understood that the further fin sections 63 may take any other shape and extend slantways from the fin sections 47.
  • FIG. 9 is a perspective view showing a stator core according to a third exemplary embodiment of the present invention.
  • FIG. 10 is a perspective view similar to FIG. 9, in which the stator core is partially cut off to show arrangement of fin sub-sections.
  • FIG. 11 is a perspective view showing four stator sub-cores forming the stator core of FIG. 9.
  • the stator core 3 according to the third exemplary embodiment of the present invention is similar substantially to that shown in FIG 4 except the arrangement of the fin sections.
  • the detailed explanation for the identical or similar components is omitted. As illustrated in FIGS.
  • the stator core 3 includes four stator sub-cores 3a, 3b, 3c, 3d, each having respective airflow sub-passages 45a, 45b, 45c, 45d and respective fin sub-sections. 47a, 47b, 47c, 47d.
  • the stator sub-cores 3a, 3b, 3c, 3d are assembled together to form the stator core 3
  • the fin sub-sections of the adjacent stator sub-cores 3a, 3b, 3c, 3d staggers with each other while the winding sub-slots 43a, 43b, 43c, 43d of the four stator sub-cores 3a, 3b, 3c, 3d are aligned with each other.
  • the fin sub-section 47a of the stator sub-core 3a staggers with the fin sub-section 47b of the stator sub-core 3b
  • the fin sub-section 47b of the stator sub-core 3b staggers with the fin sub-section 47c of the stator sub-core 3c
  • the fin sub-section 47c of the stator sub-core 3c staggers with the fin sub-section 47d of the stator sub-core 3d.
  • stator core 3 is shown to include four stator sub-cores, it should be understand that the stator core 3 may have less than or more than four stator sub-cores.
  • the fin sub-section on the stator sub-core is shown to locate at the middle of two fin sub-sections on the adjacent stator sub-core, the fin sub-section on the stator sub-core may locate at any position between two fin sub-sections on the adjacent stator sub-core.
  • the stator sub-core may further include a plurality of further fin sub-sections extending from the fin sub-sections, just as shown in FIGS 7 and 8.
  • each of the stator sub-cores may be assembled by a plurality of stator laminations 29 having the same profile or shape.
  • the stator lamination 29 is symmetrical about one axis XX which passes through a center O of the stator lamination.
  • An angular pitch between the adjacent fins 39 equally spaced on the stator lamination 29 should have a value such that 360 degrees divided by this pitch results in an odd integer number. This odd integer number is the number of the fins 39 equally spaced on the stator lamination 29.
  • stator sub-cores having the stator laminations 29 When assembling the stator sub-cores having the stator laminations 29 to form the stator core 3, the immediate next stator sub-core is rotated by 180 degrees around this symmetrical axis so that the fin sub-sections of the adjacent stator sub-cores staggers with each other.
  • stator sub-core 3b is rotated by 180 degrees around this symmetrical axis x-x relative to the stator sub-core 3a
  • stator sub-core 3d is rotated by 180 degrees around this symmetrical axis x-x relative to the stator sub-core 3c while the stator sub-cores 3a and 3c have the same orientation.
  • stator laminations 29 are for example stamped, all the stator laminations 29 may be stamped by the same stamping die using the same stamping process.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Iron Core Of Rotating Electric Machines (AREA)
  • Motor Or Generator Cooling System (AREA)

Abstract

Une stratification de stator (29) permettant de former un noyau de stator (3) d'une machine électrique (1) comprend : un corps (30) ; une ouverture centrale (31) formée dans le corps (30) et dimensionnée pour recevoir un rotor (21) de la machine électrique (1) ; une série de fentes (33) disposées autour de l'ouverture centrale (31) et formées dans le corps (30), chacune étant conçue pour contenir un ensemble d'enroulements de stator (25) ; et une série d'ouvertures fermées (37) disposées autour de la série de fentes (33) et formées dans le corps (30), chacune étant conçue pour permettre le passage de l'écoulement d'air, et une paroi entre les ouvertures fermées (37) adjacentes formant une ailette (39) qui s'étend radialement vers l'extérieur par rapport à l'ouverture centrale (31). L'invention concerne également une machine électrique (1) qui comprend la stratification de stator (29). Il est possible d'améliorer l'efficacité de refroidissement de la stratification de stator (29) et de la machine électrique (1).
PCT/CN2016/077186 2016-03-24 2016-03-24 Stratification de stator et machine électrique WO2017161527A1 (fr)

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PCT/CN2016/077186 WO2017161527A1 (fr) 2016-03-24 2016-03-24 Stratification de stator et machine électrique
PCT/CN2016/087056 WO2017161721A1 (fr) 2016-03-24 2016-06-24 Stratification de stator et machine électrique

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Application Number Priority Date Filing Date Title
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PCT/CN2016/087056 WO2017161721A1 (fr) 2016-03-24 2016-06-24 Stratification de stator et machine électrique

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Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3487042A1 (fr) * 2017-11-20 2019-05-22 Hamilton Sundstrand Corporation Moteur électrique
EP3793063A1 (fr) * 2019-09-11 2021-03-17 Dana Belgium N.V. Pile de stratifications pour un stator doté de canaux de refroidissement
EP4012891A1 (fr) * 2020-12-10 2022-06-15 Moteurs Leroy-Somer Stator de machine électrique tournante comportant un dissipateur thermique
US11770041B2 (en) 2020-12-30 2023-09-26 Dana Heavy Vehicle Systems Group, Llc Systems and method for an electric motor with molded coolant jacket and spray ring
US11876434B2 (en) 2021-09-03 2024-01-16 Dana Limited Air gap scavenging system for oil cooled electric motor
US11916459B2 (en) 2020-12-30 2024-02-27 Dana Heavy Vehicle Systems Group, Llc Systems and method for an electric motor with spray ring
WO2024115375A1 (fr) * 2022-12-02 2024-06-06 Jaguar Land Rover Limited Noyau de stator
US12009723B2 (en) 2021-09-21 2024-06-11 Dana Automotive Systems Group, Llc Electric motor with water jacket and oil-cooled stator and method for operation of the electric motor
GB2625064A (en) * 2022-12-02 2024-06-12 Jaguar Land Rover Ltd A stator core for an electric machine

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JPH0787711A (ja) * 1993-09-16 1995-03-31 Fanuc Ltd 冷却媒体通路を備えた電動機のステータ
CN1302470A (zh) * 1998-04-02 2001-07-04 布鲁克汽车有限公司 电机
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Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3487042A1 (fr) * 2017-11-20 2019-05-22 Hamilton Sundstrand Corporation Moteur électrique
US20190157922A1 (en) * 2017-11-20 2019-05-23 Hamilton Sundstrand Corporation Electric motor
EP3793063A1 (fr) * 2019-09-11 2021-03-17 Dana Belgium N.V. Pile de stratifications pour un stator doté de canaux de refroidissement
EP4012891A1 (fr) * 2020-12-10 2022-06-15 Moteurs Leroy-Somer Stator de machine électrique tournante comportant un dissipateur thermique
FR3117705A1 (fr) * 2020-12-10 2022-06-17 Moteurs Leroy-Somer Stator de machine électrique tournante comportant un dissipateur thermique
US11770041B2 (en) 2020-12-30 2023-09-26 Dana Heavy Vehicle Systems Group, Llc Systems and method for an electric motor with molded coolant jacket and spray ring
US11916459B2 (en) 2020-12-30 2024-02-27 Dana Heavy Vehicle Systems Group, Llc Systems and method for an electric motor with spray ring
US11876434B2 (en) 2021-09-03 2024-01-16 Dana Limited Air gap scavenging system for oil cooled electric motor
US12009723B2 (en) 2021-09-21 2024-06-11 Dana Automotive Systems Group, Llc Electric motor with water jacket and oil-cooled stator and method for operation of the electric motor
WO2024115375A1 (fr) * 2022-12-02 2024-06-06 Jaguar Land Rover Limited Noyau de stator
GB2625064A (en) * 2022-12-02 2024-06-12 Jaguar Land Rover Ltd A stator core for an electric machine

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