EP1932226A1 - Cooling of stator windings of an electrical machine - Google Patents

Cooling of stator windings of an electrical machine

Info

Publication number
EP1932226A1
EP1932226A1 EP05791980A EP05791980A EP1932226A1 EP 1932226 A1 EP1932226 A1 EP 1932226A1 EP 05791980 A EP05791980 A EP 05791980A EP 05791980 A EP05791980 A EP 05791980A EP 1932226 A1 EP1932226 A1 EP 1932226A1
Authority
EP
European Patent Office
Prior art keywords
stator
channel
cooling
channels
cooling medium
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.)
Withdrawn
Application number
EP05791980A
Other languages
German (de)
French (fr)
Inventor
Fransciscus Johan Marie Thoolen
Gerardus Theodorus Lommen
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.)
CCM Beheer BV
Original Assignee
CCM Beheer BV
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 CCM Beheer BV filed Critical CCM Beheer BV
Publication of EP1932226A1 publication Critical patent/EP1932226A1/en
Withdrawn legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K3/00—Details of windings
    • H02K3/04—Windings characterised by the conductor shape, form or construction, e.g. with bar conductors
    • H02K3/24—Windings characterised by the conductor shape, form or construction, e.g. with bar conductors with channels or ducts for cooling medium between the conductors

Definitions

  • the present invention relates to a cooling method and a stator arrangement for an electrical machine, which may be a rotating machine or a linear machine.
  • one way of accomplishing cooling of stator windings of an electrical machine has been to provide cooling channels in a stator body manufactured from a magnetizable material (such as a laminated stack of suitably shaped metal sheets) , with the cooling channels as close as possible to the windings.
  • a cooling fluid (the fluid being a gas or a liquid) is made to flow.
  • the stator windings are arranged in slots formed by axially and radially extending teeth of the stator body, and the cooling channels are provided essentially in parallel to the stator windings in the stator body.
  • the cooling channels are provided essentially parallel to a center line of the stator.
  • a drawback of the stator cooling arrangement using cooling channels in the stator body is that the heat transfer from the stator windings to a fluid flowing in the cooling channels is poor due to the high thermal resistance in the path of the heat flow, resulting in a poor cooling performance.
  • Applying more cooling channels to compensate for the high thermal resistance negatively affects the magnetic performance of the stator body, and consequently also reduces the performance of the electrical machine.
  • the cooling channels have a relatively small cross-section, the total flow of the cooling fluid in the channels will be limited, whereas for a more optimum heat conduction from the stator body to the cooling fluid a large circumferential area of the cooling channels in combination with a turbulent flow of the cooling fluid would be desirable.
  • a drawback of the stator cooling arrangement using hollow wires is the complex and failure-prone construction needed for the supply and discharge of the cooling fluid to the wires. Further, applying hollow wires results in a reduced part of the stator winding cross- section being available for conductor material. Another drawback is the uneven temperature load on different wires of the same stator winding due to different cooling fluid temperatures in different wires of the same stator winding in the same slot.
  • An object of the invention is to provide a cooling method and arrangement for a stator of an electrical machine which enable a high cooling performance in a simple construction.
  • a cooling method for a stator winding of an electrical machine comprising: providing a stator. body with a plurality of channels near a surface of the stator body facing a rotor of the electrical machine; providing a plurality of stator winding wires in each channel, the cross-section of each channel being greater than the sum of the cross- ' sections of the stator winding wires in each channel; and guiding a cooling medium through each channel.
  • the channels can be . completely . filled with winding wires, resulting in a filling factor of e.g. 30% to 70%. The remaining free space between the individual winding wires in the channels is used to conduct the cooling medium.
  • the cooling fluid will flow through many sub-channels in between the winding wires, and all sub-channels combined will have a large total flow cross-sectional area. Further, since the sub-channels near the wires are not perfectly straight, in particular if litze wires are used (which have been twisted) , the flow of the cooling medium is forced to become turbulent, which improves the heat transfer performance (cooling) by increasing a heat transfer coefficient. Also, as a result of the large flow cross-sectional area of the cooling medium in the combined cross-sections of the sub-channels, .the pressure drop of the cooling fluid over the stator will be reduced (thus requiring less pumping power) .
  • the invention applies to rotating electrical machines, having an essentially cylindrical rotor positioned inside or outside an essentially cylindrical stator, whereas the invention also applies to linear electrical machines, having an elongated stator.
  • a stator arrangement for an electrical machine comprising: a stator body; a plurality of channels near a surface of the stator body facing a rotor of the electrical machine; a plurality of stator winding wires accommodated in each channel, the cross- section of each channel being greater than the sum of the cross- sections of the stator winding wires in each channel; and cooling .
  • the cooling medium guiding means comprise a first manifold arranged at a first end of the stator body, the first manifold being in fluid communication with a first end of each channel; and a second manifold arranged at a second end. of the stator body opposite to the first end of the stator body, the second manifold being in fluid communication with a second end of each channel opposite to the first end of each channel.
  • the first and second ends of the stator body are the axial ends thereof.
  • the cooling medium is supplied via an inlet to the first manifold, "then forced directly through the free cross-sectional area (referred.to as sub-channels above) between the winding wires to the second manifold, and (possibly via channels in the stator body) towards an outlet.
  • Such an embodiment may also realize that the winding heads are directly into contact with the cooling medium, for an optimum cooling of the complete stator winding wires .
  • the cooling medium guiding means comprise a .group of inlets. arranged at -a first end of the stator body, each of the inlets being in fluid communication with a first end of a channel of a first group of the channels; and a group of outlets arranged at the first end of the stator body, each of the outlets being in fluid communication, with a first end of a channel of a second group ' of the channels, wherein at a second end of the stator body opposite to the first end of the stator body, second ends of the channels are in fluid communication with each other.
  • the exact construction to enable supply of the cooling medium to the stator windings and to discharge the cooling fluid therefrom is not essential to the invention, so any other arrangement to realize the same is possible. Since the cooling medium is forced through sub-channels formed by the outer surface of the windings instead of via channels in the lamination stack or channels inside the stator winding wires, the cooling performance is high. Also, by using the free cross-sectional flow area which is automatically present in between the windings due to a maximum filling factor of about 70%, a more compact and simpler stator construction can be realized. Further, the arrangement also enables to have the winding heads in direct contact with the cooling fluid for an optimum cooling of the windings. As a further aspect of the invention, since no separate cooling channels have to be created in the lamination stack, the distribution of the magnetic flux in the lamination stack near the windings is considerably improved when compared to a situation in which such separate channels are present.
  • Fig: 1 ' shows a cross-section of a detail of a cylindrical inner stator of an electrical machine, according to section I-I in Fig. 3;
  • Fig. 2 shows a .detail of a slot of a stator
  • Fig. 3 schematically shows a longitudinal section of the stator of Fig. 1;
  • Fig. 4 schematically shows a longitudinal section of another embodiment of the " stator "of Fig. 1.
  • Fig. 1 shows a part of a stator lamination stack 1 with teeth 2 (extending essentially at right angles to the plane of the drawing) and stator winding wires 3 which are positioned inside slots created by the teeth 2.
  • the slots are sealed by a sealing bush 4- which may be made from any suitable material, such as glass fiber reinforced composite.
  • the slots, sealed by the sealing bush 4, constitute channels.
  • Fig. 2 shows. a detail of a stator slot, such as the slot of the stator according to Fig. 1.
  • the stator winding wires 3 occupy only part of the cross-sectional area of the channel, such that subchannels 3a are formed in between the stator winding wires 3.
  • a cooling fluid may be conducted in between the stator winding wires in the sub-channels of each channel.
  • the slots may also be sealed by elongated strips or the like, or the slots may be formed by through bores in the stator lamination stack 1, obviating a separate sealing member.
  • Fig. 3 shows an embodiment of the stator of Fig. 1 to be used in an arrangement with an outer rotor and inner stator (although a similar construction is possible for an inner rotor/outer stator arrangement) .
  • the stator with centre line 5 comprises a stator body 6, surrounded by the lamination stack 1.
  • the winding wires.3 are located inside slots, formed by the teeth 2 (Fig. 1) . It is observed here that the slots may be part of the lamination stack 1, or may be formed by a separate part (not shown in detail) located at the outer ⁇ circumference of a toothless lamination stack, which is a so-called toothless stator.
  • a cooling medium may be conducted directly in between the winding wires 3, via an inlet 7 and first manifold 8, and after ' passing through the slots is conducted via a second manifold 9 to an outlet 10, or vice versa.
  • Winding heads 11 near a first and second end of the stator body are in direct contact with the cooling fluid.
  • Fig. 4 shows another embodiment of the stator of Fig. 1 ' .
  • the embodiment of Fig. 4 differs from the embodiment of Fig. 3 in the cooling arrangement.
  • a cooling medium may be supplied via a group of inlets 20 to a first group of slots (or channels) containing winding wires 3.
  • a first group of slots may e.g. comprise every other slot, when ' seen in a circumferential direction of the stator body .6, and the corresponding inlets 20 may also be circumferentially arranged along the stator body.
  • Winding .heads 11 at the associated (first) end of the stator body and belonging to. the first group of slots are separated (e.g.
  • a separation, wall 21 from other winding heads at the same (first) end of the stator body, so that each inlet 20 is in fluid communication with winding wires in a slot of the first group of slots.
  • Each of the inlets 20 may be in fluid communication with another one, but not with any of said other winding heads.
  • a manifold 22 is formed connecting all slots of the first and a second group of slots different from the first group of slots, the manifold 22 accommodating winding heads 23 belonging to winding wires 3 situated in the first and second group of slots. Further, winding heads 15 at the first end of the stator body and belonging to the second group of slots are separated (e.g.
  • the winding heads 15 are in fluid communication with outlets 24, so that each outlet 24 is in fluid communication with winding wires in a slot of the second group of slots.
  • Each of the outlets 24 may be in fluid communication with another one, but not with any of the winding heads 11 belonging, to the first group of slots.
  • a cooling medium may flow from the inlets 20 through the first group of slots to the manifold 22, and from the manifold 22 through the second group of slots to the outlets 24, or vice versa (where an inlet becomes an outlet,' and. an outlet becomes an inlet) .
  • the effect of such a cooling arrangement may be a more even temperature distribution in the stator body than in the arrangement according to Fig. 3.
  • cooling fluid and "cooling medium” have been used, both' indicating either a liquid or a ' gas, such as air, used for cooling purposes.
  • the above embodiments provide a cooling arrangement for .a stator of an electrical machine, which allows for a compact stator construction in combination with a high power density in the stator.

Abstract

In a method and arrangement for cooling a stator winding of a rotating or linear electrical machine, a stator body (2) has a plurality of channels near a surface of the stator body. In each channel, a plurality of stator winding wires (3) is present. The cross-section of each channel is greater than the sum of the cross- sections of the stator winding wires. A cooling medium is guided through each channel. The cooling medium is in direct contact with the stator winding wires.

Description

Cooling of stator windings of an electrical machine.
The present invention relates to a cooling method and a stator arrangement for an electrical machine, which may be a rotating machine or a linear machine.
In the prior art, one way of accomplishing cooling of stator windings of an electrical machine has been to provide cooling channels in a stator body manufactured from a magnetizable material (such as a laminated stack of suitably shaped metal sheets) , with the cooling channels as close as possible to the windings. In the cooling channels, a cooling fluid (the fluid being a gas or a liquid) is made to flow. The stator windings are arranged in slots formed by axially and radially extending teeth of the stator body, and the cooling channels are provided essentially in parallel to the stator windings in the stator body. In the case of rotating machines, the cooling channels are provided essentially parallel to a center line of the stator.
A drawback of the stator cooling arrangement using cooling channels in the stator body is that the heat transfer from the stator windings to a fluid flowing in the cooling channels is poor due to the high thermal resistance in the path of the heat flow, resulting in a poor cooling performance. Applying more cooling channels to compensate for the high thermal resistance, however, negatively affects the magnetic performance of the stator body, and consequently also reduces the performance of the electrical machine. Further, if the cooling channels have a relatively small cross-section, the total flow of the cooling fluid in the channels will be limited, whereas for a more optimum heat conduction from the stator body to the cooling fluid a large circumferential area of the cooling channels in combination with a turbulent flow of the cooling fluid would be desirable.
Another way of accomplishing cooling of stator windings of an electrical machine has been to use hollow wires to form the stator windings, where a cooling fluid is made to flow through the wires.
A drawback of the stator cooling arrangement using hollow wires is the complex and failure-prone construction needed for the supply and discharge of the cooling fluid to the wires. Further, applying hollow wires results in a reduced part of the stator winding cross- section being available for conductor material. Another drawback is the uneven temperature load on different wires of the same stator winding due to different cooling fluid temperatures in different wires of the same stator winding in the same slot.
An object of the invention is to provide a cooling method and arrangement for a stator of an electrical machine which enable a high cooling performance in a simple construction.
In an embodiment of the invention, there is provided a cooling method for a stator winding of an electrical machine, the method comprising: providing a stator. body with a plurality of channels near a surface of the stator body facing a rotor of the electrical machine; providing a plurality of stator winding wires in each channel, the cross-section of each channel being greater than the sum of the cross- ' sections of the stator winding wires in each channel; and guiding a cooling medium through each channel. The channels can be . completely . filled with winding wires, resulting in a filling factor of e.g. 30% to 70%. The remaining free space between the individual winding wires in the channels is used to conduct the cooling medium. Thus, the cooling fluid will flow through many sub-channels in between the winding wires, and all sub-channels combined will have a large total flow cross-sectional area. Further, since the sub-channels near the wires are not perfectly straight, in particular if litze wires are used (which have been twisted) , the flow of the cooling medium is forced to become turbulent, which improves the heat transfer performance (cooling) by increasing a heat transfer coefficient. Also, as a result of the large flow cross-sectional area of the cooling medium in the combined cross-sections of the sub-channels, .the pressure drop of the cooling fluid over the stator will be reduced (thus requiring less pumping power) .
It is noted that the invention applies to rotating electrical machines, having an essentially cylindrical rotor positioned inside or outside an essentially cylindrical stator, whereas the invention also applies to linear electrical machines, having an elongated stator.
In an embodiment of the invention, there is provided a stator arrangement for an electrical machine, the stator arrangement comprising: a stator body; a plurality of channels near a surface of the stator body facing a rotor of the electrical machine; a plurality of stator winding wires accommodated in each channel, the cross- section of each channel being greater than the sum of the cross- sections of the stator winding wires in each channel; and cooling . medium guiding means for guiding a cooling medium through each channel,, the cooling medium being in direct contact with the stator winding wires .
In an embodiment, the cooling medium guiding means comprise a first manifold arranged at a first end of the stator body, the first manifold being in fluid communication with a first end of each channel; and a second manifold arranged at a second end. of the stator body opposite to the first end of the stator body, the second manifold being in fluid communication with a second end of each channel opposite to the first end of each channel. In the case of rotating machines, the first and second ends of the stator body are the axial ends thereof. The cooling medium is supplied via an inlet to the first manifold, "then forced directly through the free cross-sectional area (referred.to as sub-channels above) between the winding wires to the second manifold, and (possibly via channels in the stator body) towards an outlet. Such an embodiment may also realize that the winding heads are directly into contact with the cooling medium, for an optimum cooling of the complete stator winding wires .
In another embodiment, the cooling medium guiding means comprise a .group of inlets. arranged at -a first end of the stator body, each of the inlets being in fluid communication with a first end of a channel of a first group of the channels; and a group of outlets arranged at the first end of the stator body, each of the outlets being in fluid communication, with a first end of a channel of a second group 'of the channels, wherein at a second end of the stator body opposite to the first end of the stator body, second ends of the channels are in fluid communication with each other.
Note that the exact construction to enable supply of the cooling medium to the stator windings and to discharge the cooling fluid therefrom is not essential to the invention, so any other arrangement to realize the same is possible. Since the cooling medium is forced through sub-channels formed by the outer surface of the windings instead of via channels in the lamination stack or channels inside the stator winding wires, the cooling performance is high. Also, by using the free cross-sectional flow area which is automatically present in between the windings due to a maximum filling factor of about 70%, a more compact and simpler stator construction can be realized. Further, the arrangement also enables to have the winding heads in direct contact with the cooling fluid for an optimum cooling of the windings. As a further aspect of the invention, since no separate cooling channels have to be created in the lamination stack, the distribution of the magnetic flux in the lamination stack near the windings is considerably improved when compared to a situation in which such separate channels are present.
In the following, further features, characteristics and advantages of the method and device according to the invention will be described by reference to the accompanying drawings illustrating a non-limiting embodiment, wherein:
Fig: 1' shows a cross-section of a detail of a cylindrical inner stator of an electrical machine, according to section I-I in Fig. 3;
Fig. 2 shows a .detail of a slot of a stator;
Fig. 3 schematically shows a longitudinal section of the stator of Fig. 1; and
Fig. 4 schematically shows a longitudinal section of another embodiment of the " stator "of Fig. 1.
In the different Figures, the- same reference numerals indicate the same items, or items with the same function.
Fig. 1 shows a part of a stator lamination stack 1 with teeth 2 (extending essentially at right angles to the plane of the drawing) and stator winding wires 3 which are positioned inside slots created by the teeth 2.. The slots are sealed by a sealing bush 4- which may be made from any suitable material, such as glass fiber reinforced composite. The slots, sealed by the sealing bush 4, constitute channels.
Fig. 2 shows. a detail of a stator slot, such as the slot of the stator according to Fig. 1. The stator winding wires 3 occupy only part of the cross-sectional area of the channel, such that subchannels 3a are formed in between the stator winding wires 3. A cooling fluid may be conducted in between the stator winding wires in the sub-channels of each channel. It is noted that the slots may also be sealed by elongated strips or the like, or the slots may be formed by through bores in the stator lamination stack 1, obviating a separate sealing member.
Fig. 3 shows an embodiment of the stator of Fig. 1 to be used in an arrangement with an outer rotor and inner stator (although a similar construction is possible for an inner rotor/outer stator arrangement) . The stator with centre line 5 comprises a stator body 6, surrounded by the lamination stack 1. The winding wires.3 are located inside slots, formed by the teeth 2 (Fig. 1) . It is observed here that the slots may be part of the lamination stack 1, or may be formed by a separate part (not shown in detail) located at the outer ■ circumference of a toothless lamination stack, which is a so-called toothless stator. A cooling medium may be conducted directly in between the winding wires 3, via an inlet 7 and first manifold 8, and after' passing through the slots is conducted via a second manifold 9 to an outlet 10, or vice versa. Winding heads 11 near a first and second end of the stator body are in direct contact with the cooling fluid.
Fig. 4 shows another embodiment of the stator of Fig. 1'. The embodiment of Fig. 4 differs from the embodiment of Fig. 3 in the cooling arrangement. According to Fig. 4, a cooling medium may be supplied via a group of inlets 20 to a first group of slots (or channels) containing winding wires 3. A first group of slots may e.g. comprise every other slot, when' seen in a circumferential direction of the stator body .6, and the corresponding inlets 20 may also be circumferentially arranged along the stator body. Winding .heads 11 at the associated (first) end of the stator body and belonging to. the first group of slots are separated (e.g. by a separation, wall 21) from other winding heads at the same (first) end of the stator body,, so that each inlet 20 is in fluid communication with winding wires in a slot of the first group of slots. Each of the inlets 20 may be in fluid communication with another one, but not with any of said other winding heads. At a second end of the stator body, a manifold 22 is formed connecting all slots of the first and a second group of slots different from the first group of slots, the manifold 22 accommodating winding heads 23 belonging to winding wires 3 situated in the first and second group of slots. Further, winding heads 15 at the first end of the stator body and belonging to the second group of slots are separated (e.g. by the separation walls 21) from the winding heads 11 at the first end of the stator body. The winding heads 15 are in fluid communication with outlets 24, so that each outlet 24 is in fluid communication with winding wires in a slot of the second group of slots. Each of the outlets 24 may be in fluid communication with another one, but not with any of the winding heads 11 belonging, to the first group of slots.
In the arrangement shown in Fig. 4, a cooling medium may flow from the inlets 20 through the first group of slots to the manifold 22, and from the manifold 22 through the second group of slots to the outlets 24, or vice versa (where an inlet becomes an outlet,' and. an outlet becomes an inlet) . The effect of such a cooling arrangement may be a more even temperature distribution in the stator body than in the arrangement according to Fig. 3.
It is noted that throughout this specification, the terms "cooling fluid" and "cooling medium" have been used, both' indicating either a liquid or a 'gas, such as air, used for cooling purposes.
The above embodiments provide a cooling arrangement for .a stator of an electrical machine, which allows for a compact stator construction in combination with a high power density in the stator.
The terms "a" or "an", as used herein, are defined as one or more than one. The term plurality, as used herein, is defined as two or more than two. The term another, as used herein,- is defined as at least a. second dr. more. . . ' ' ..
While the invention has been described and illustrated in its preferred embodiments, it should be understood that departures' may be made therefrom within the scope of the invention, which is 'not limited to the details disclosed herein.

Claims

1. Method for cooling a stator winding of an electrical machine, comprising: providing a stator body with a plurality of channels near a surface of the stator body facing a rotor of the electrical machine; providing a plurality of stator winding wires in each channel, the cross-section of each channel being greater than the sum of the cross-sections of the stator winding wires in each channel; guiding a cooling medium through each channel, the cooling medium being in direct contact with the stator winding wires.
2. Method according to claim 1, wherein the cooling medium is conducted along winding heads of the stator winding wires.
3. Stator arrangement for an electrical machine, comprising: a stator body; a plurality of channels near a surface of the stator body facing a rotor of the electrical machine; a plurality of stator winding wires accommodated in each channel, the cross-section of each channel being greater than the sum of the cross-sections of the stator winding wires in each channel; and a cooling medium guiding means for guiding a cooling medium through each channel, the cooling medium being in direct contact with the stator winding wire's .
4. Stator arrangement according to claim 3, wherein the cooling, medium guiding means comprise: a first manifold arranged at a first end of the stator body, the first manifold being in fluid communication with a first end of each . channel; and . ■ a second manifold arranged at a second end of the stator body opposite to the first end of the stator body, the second manifold being in fluid communication with a second end of each channel . opposite to the. first end of each channel. ' .
5. Stator arrangement according to claim 4, wherein winding heads of the stator winding wires are arranged in said first and second manifold.
6. Stator arrangement according to claim 3, wherein the cooling medium guiding means, comprise: a group of inlets arranged at a first end of the stator body, each of the inlets being in fluid communication with a first end of a channel of a first group of the channels; and a group of outlets arranged at the first end of the stator body, each of the outlets being in fluid communication with a first end of a channel of a second group of the channels, wherein at a second end of the stator body opposite to the first • end .of the stator' body, second ends of the channels are in fluid communication with each other.
EP05791980A 2005-10-06 2005-10-06 Cooling of stator windings of an electrical machine Withdrawn EP1932226A1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/NL2005/000722 WO2007040384A1 (en) 2005-10-06 2005-10-06 Cooling of stator windings of an electrical machine

Publications (1)

Publication Number Publication Date
EP1932226A1 true EP1932226A1 (en) 2008-06-18

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP05791980A Withdrawn EP1932226A1 (en) 2005-10-06 2005-10-06 Cooling of stator windings of an electrical machine

Country Status (2)

Country Link
EP (1) EP1932226A1 (en)
WO (1) WO2007040384A1 (en)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102017204472A1 (en) 2017-03-17 2018-09-20 Siemens Aktiengesellschaft Stator with winding cooling and electric machine
FR3093388B1 (en) * 2019-02-28 2021-03-12 Nidec Psa Emotors Rotating electric machine with improved stator cooling
EP3940925A1 (en) * 2020-07-17 2022-01-19 Universiteit Gent Efficient cooling of electromagnetic coils
CN113394890B (en) * 2021-06-28 2023-04-07 威海西立电子有限公司 Motor stator cooling system and motor
WO2023139019A2 (en) * 2022-01-21 2023-07-27 Liebherr-Components Biberach Gmbh Electrical multi-phase machine

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US3624432A (en) * 1969-12-19 1971-11-30 Bbc Brown Boveri & Cie Arrangement for securing electrical conductor bars within slots to prevent vibration
US3995181A (en) * 1975-06-13 1976-11-30 Sundstrand Corporation Matrix for enhancing the flow of coolant through an alternator stator
US5081382A (en) * 1990-10-01 1992-01-14 Sundstrand Corporation Generator end turn cooling using oil flow control tubes
US6787948B2 (en) * 2001-06-29 2004-09-07 Bae Systems Controls Inc. Stator construction for high performance rotating machines
JPWO2004019468A1 (en) * 2002-08-21 2005-12-15 トヨタ自動車株式会社 Vehicle motor

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