WO2024037817A1 - Structure d'enroulement à fente fractionnaire et moteur à fente fractionnaire - Google Patents

Structure d'enroulement à fente fractionnaire et moteur à fente fractionnaire Download PDF

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Publication number
WO2024037817A1
WO2024037817A1 PCT/EP2023/070103 EP2023070103W WO2024037817A1 WO 2024037817 A1 WO2024037817 A1 WO 2024037817A1 EP 2023070103 W EP2023070103 W EP 2023070103W WO 2024037817 A1 WO2024037817 A1 WO 2024037817A1
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WO
WIPO (PCT)
Prior art keywords
slot
legs
fractional slot
shaped
free ends
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Application number
PCT/EP2023/070103
Other languages
English (en)
Inventor
Xinhua Liu
Alina Sun
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
Publication of WO2024037817A1 publication Critical patent/WO2024037817A1/fr

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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
    • H02K3/12—Windings characterised by the conductor shape, form or construction, e.g. with bar conductors arranged in slots
    • 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
    • H02K3/28—Layout of windings or of connections between windings

Definitions

  • the utility model generally relates to the field of motors, in particular to a fractional slot winding structure and a fractional slot motor.
  • hairpin windings are commonly used in integerslot motors because for fractional slot motors, the welding end of the hairpin winding is often complex in structure and large in volume, and requires a complex manufacturing process, making it difficult to achieve automated mass production.
  • the utility model aims to provide an improved fractional slot winding structure and a corresponding fractional slot motor so as to simplify the end structure of the fractional slot winding structure.
  • a fractional slot winding structure comprising: an iron core provided with a plurality of slots arranged in a circumferential direction around a central axis of the fractional slot winding structure, the slots penetrating from a first side of the iron core to a second side opposite to the first side; and a fractional slot winding comprising a plurality of preformed U-shaped wires, each U- shaped wire comprising two legs, a connecting end connecting the two legs, and two free ends extending from the two legs in a direction away from the connecting end, the plurality of U-shaped wires being inserted into the slots in the same direction such that the connecting ends are all located at a first side of the iron core and the free ends are all located at a second side of the iron core.
  • the slot spans between the two legs of each U- shaped wire are inconsistent, and the slot spans between two adjacent legs respectively belonging to any two adjacent U-shaped wires of the plurality of U-shaped wires are equal, the two adjacent legs extending from the free ends are electrically connected to each other.
  • the end structure of the fractional slot winding structure can be simplified.
  • the free ends of the U-shaped wires need to span different slot numbers, so that the free ends of the plurality of U-shaped wires together form a more complex and bulky large end structures.
  • the utility model it is possible to realize that the slot span between two adjacent legs belonging to any two adjacent U-shaped wires of the plurality of U-shaped wires is equal under the condition that the slot span between the two legs of each U-shaped wire is inconsistent. Therefore, the free ends of a plurality of U-shaped wires can have a neat and regular arrangement structure. This is beneficial to reduce the end volume of the fractional slot winding structure.
  • the fractional slot winding may be arranged as a multi-layer winding such that the free ends of the plurality of U-shaped wires are arranged in at least two layers about a central axis, wherein the free ends located in odd-numbered layers in a radially outward order in the at least two layers are twisted in a first circumferential direction and span the same angle about the central axis, and the free ends located in even-numbered layers in a radially outward order in the at least two layers are twisted in a second circumferential direction and span the same angle about the central axis, wherein the first circumferential direction is one of a clockwise direction and a counterclockwise direction as viewed from the second side to the first side, and the second circumferential direction is the other of a clockwise direction and a counterclockwise direction as viewed from the second side to the first side. Therefore, in the process of twisting the free ends of the U- shaped wire, the free ends located in the same layer can be
  • the plurality of slots is 96 slots; the number of poles of the fractional slot winding is 44; the fractional slot winding is formed into a three-phase winding; the slot span between two adjacent legs of any two adjacent U-shaped wires of the plurality of U-shaped wires is 2; the plurality of U-shaped wires comprises a first U-shaped wire having a slot span of 2 between two legs, a second U-shaped wire having a slot span of 3 between two legs, and a third U- shaped wire having a slot span of 7 between two legs.
  • This fractional slot winding structure is particularly advantageous because it has the advantages of low cogging torque and low noise.
  • a fractional slot motor comprising a rotor and a stator, the stator comprising a fractional slot winding structure according to the utility model.
  • Fig. 1 schematically illustrates a fractional slot winding structure for a motor in accordance with an exemplary embodiment of the utility model
  • Figs. 2A and 2B schematically illustrate U-shaped wires for use in a fractional slot winding structure according to an exemplary embodiment of the utility model
  • Figs. 3A, 3B, and 3C schematically illustrate three different shapes of U-shaped wires, respectively;
  • Fig. 4 schematically illustrates an arrangement of the U-shaped wires of a fractional slot winding according to an exemplary embodiment of the utility model
  • Fig. 5 schematically illustrates an arrangement of the U-shaped wires of the U-phase winding of the fractional slot winding structure shown in Fig. 4.
  • Fig. 1 schematically illustrates a fractional slot winding structure according to an exemplary embodiment of the utility model.
  • the fractional slot winding structure may, for example, be used in a motor as a stator or rotor of a motor to less.
  • the motor is, for example, a motor or a generator.
  • the fractional slot winding structure may in particular be a stator winding structure of a motor.
  • the exemplary embodiment of a fractional slot winding structure comprises an iron core 1 and a fractional slot winding 2.
  • the iron core 1 may be made, for example, of silicon steel and formed in a generally cylindrical shape.
  • the iron core 1 is provided with a plurality of slots 11 arranged in a circumferential direction around the central axis L of the fractional slot winding structure.
  • the slots 11 penetrate from a first side 12 of the iron core 1 to a second side 13 opposite to the first side 12.
  • the fractional slot winding 2 is a winding with a fractional number of slots per pole and phase.
  • the fractional slot winding 2 comprises a plurality of preformed U-shaped wires 20 (e.g., hairpin wires).
  • each U-shaped wire 20 comprises two legs 210, a connecting end 220 connecting the two legs 210, and two free ends 230 extending from the two legs 210 in a direction away from the connecting end 220.
  • the two legs 210 comprise a first leg 211 and a second leg 212.
  • the two free ends 230 comprise a first free end 231 and a second free end 232.
  • the first free end 231 extends outwardly from the first leg 211
  • the second free end 232 extends outwardly from the second leg 212.
  • the plurality of U-shaped wires 20 are inserted into the plurality of slots 11 in the same direction.
  • the U-shaped wires 20 are inserted, for example, into the plurality of slots 11 in a direction from the first side 12 of the iron core 1 to the second side 13 such that the connecting ends 220 of the U-shaped wires 20 are all located at the first side 12 of the iron core 1 , and the free ends 230 of the U-shaped wire 20 are all located at the second side 13 of the iron core 1 .
  • the legs 210 of the U-shaped wire 20 are received within the slots 11 to form an active edge.
  • the slot spans between the two legs 210 of each U- shaped wire 20 are inconsistent, i.e.
  • the number of slots spanned by the connecting end 220 of each U-wire 20 at the first side 12 of the iron core 1 is inconsistent, or the number of slots between the two legs 210 of each U- shaped wire 20 is inconsistent.
  • the slot spans between two adjacent legs 210 belonging to any two adjacent U-shaped wires 20 of the plurality of U- shaped wires 20 are equal.
  • the two adjacent legs 210 are electrically connected to each other by the free ends 230 extending therefrom.
  • the term “adjacently” mentioned herein denotes proximity in the connection of the circuit, not in physical location.
  • the end structure of the fractional slot winding structure can be simplified.
  • the free ends 230 of each U-shaped wire 20 need to span a different number of slots according to conventional wiring, so that the free ends 230 of the plurality of U-shaped wires 20 together form a more complex end structure.
  • the slot spans between the two legs 210 of each U-shaped wire 20 are inconsistent, it is achieved that the slot spans between two adjacent legs 210 belonging to any two adjacent U-shaped wires 20 of the plurality of U- shaped wires 20 are equal.
  • connection ends 220 of the plurality of U-shaped wires 20 have a somewhat complicated arrangement structure compared to conventional wiring
  • the free ends 230 of the plurality of U-shaped wires 20 can have a neat and regular arrangement structure. It is beneficial to the overall reduction of the end volume of the fractional slot winding structure.
  • This fractional slot winding structure is particularly easy to manufacture.
  • This conductive connection may be implemented, for example, by welding the free ends 230 of adjacent U-shaped wires 20.
  • the free end 230 may also be referred to as the welding end.
  • Fig. 2A schematically illustrates the U-shaped wire 20 before the twisting operation.
  • FIG. 2B schematically illustrates the U-shaped wire 20 after the twisting operation.
  • the twisting steps in the manufacturing process of the fractional slot winding structure can be simplified by providing the free ends 230 of the U-shaped wire 20 with a neat regular arrangement structure.
  • This neat and regular arrangement also simplifies the welding operation and avoids the complicated motion trajectories of welding tools.
  • this fractional slot winding structure facilitates automated mass production.
  • the slot spans between the two legs of each U-shaped wire are inconsistent means that the slot spans between the two legs of each U-shaped wire are not identical. That is to say, the slot spans between the two legs of any of the U-shaped wires of the plurality of U-shaped wires are not equal to the slot spans between two legs of at least one other U-shaped wire of the plurality of U-shaped wires.
  • the plurality of U-shaped wires comprises a plurality of U-shaped wires having different spans between the two legs.
  • the slot span between two legs is the slot span in the same circumferential direction (clockwise or counterclockwise).
  • the fractional slot winding 2 may be arranged as a multilayer winding such that the free ends 230 of the plurality of U-shaped wires 20 are arranged in at least two layers about the central axis L.
  • the multilayer windings are arranged radially around the central axis L. As shown in Fig. 1 , the free ends 230 of the plurality of U-wires 20 are arranged in 4 layers about the central axis L.
  • the free ends 230 in the odd-numbered layers in a radially outward order are all twisted in the first circumferential direction and span the same angle about the central axis L, and the free ends 230 in the even-numbered layers in the radially outward order are all twisted in the second circumferential direction and span the same angle about the center axis L.
  • the first circumferential direction is a counterclockwise direction as viewed from the second side 13 to the first side 12
  • the second circumferential direction is a clockwise direction as viewed from the second side 13 to the first side 12. towards.
  • the free ends 230 located in the same layer can be twisted synchronously, and the twisting tool used can have a simpler structure. This is particularly conducive to automated mass production at lower cost.
  • the free ends 230 extending from the two adjacent legs 210 may be twisted in opposite directions toward each other and span the same angle about the central axis L to conductively connect to each other. This is especially beneficial to a neat and regular arrangement of the free ends 230 of the U-shaped wire 20.
  • the free ends 230 extending from the two adjacent legs 210 span 50% of the slot span between the two adjacent legs 210, respectively.
  • the free ends 230 extending from the two adjacent legs 210 may also be twisted in opposite circumferential directions with respect to each other and span different angles about the central axis L.
  • one of the two free ends 230 extending from the two adjacent legs 210 may span 25% of the slot span between the two adjacent legs 210, while the other of the two free ends 230 may span 75% of the slot span between the two adjacent legs 210.
  • one of the free ends 230 extending from the two adjacent legs 210 may span one third of the slot span between the two adjacent legs 210, while the other of the two free ends 230 may span two thirds of the slot span between the two adjacent legs 210.
  • Incongruent slot spans between the two legs 210 of each U-shaped wire 20 can be conveniently effectuated by forming U-shaped wires 20 into different shapes.
  • the plurality of U-shaped wires 20 comprises U-shaped wires 20 of at least three different shapes.
  • the slot spans between the two legs 210 are different from each other. That is to say, the connecting end 220 of any two of the differently shaped U-shaped wires 20 spans a different number of slots at the first side 12 of the iron core 1 , or the number of slots between the two legs 210 of the different shaped U-shaped wire 20 is inconsistent.
  • At least three different shapes of U-shaped wire 20 are utilized to endow the free ends 230 of the U-shaped wire 20 with a neat regular arrangement structure, so that the number of slots and the number of poles for the fractional slot winding structure can be selected within a wider range.
  • Figs. 3A, 3B, and 3C show three different shapes of U-shaped wires 20, respectively. These three different shapes of U-shaped wires 20 can be inserted into the slots 11 of the same iron core 1 to form the fractional slot winding 2. As can be seen, the configuration of these three different shapes of U-shaped wires 20 is similar, but it their legs 210 are spaced differently from each other so that when the three different shaped U-wires 20 are inserted into the slots 11 of the iron core 1 , the number of slots spanned by their connecting end is also correspondingly different from each other.
  • the U-shaped wire 20 is a flat wire.
  • the U-shaped wire 20 may have a generally rectangular cross-section.
  • the slot filling rate can be increased, and the resistance of the fractional slot winding 2 can be reduced to increase the power density of the motor, and improve the heat dissipation.
  • Fig. 4 schematically illustrates an arrangement of the U-shaped wire of a fractional slot winding structure according to an exemplary embodiment of the utility model.
  • the fractional slot winding 2 is here formed as a three-phase winding, which comprises, for example, a U-phase winding, a V-phase winding and a W-phase winding. In Fig. 4, the windings with different phases are shown without color. In other examples, the fractional slot winding 2 may also be formed as a single-phase winding, a two-phase winding, or the like.
  • the iron core 1 may be provided with 96 slots 11 arranged circumferentially around the central axis L of the fractional slot winding structure (see Fig. 1 ).
  • these 96 slots 11 are schematically shown in Fig. 4 in an expanded manner into upper and lower portions to fully show the 96 slots 11 of the fractional slot winding structure.
  • the fractional slot winding 2 comprises a plurality of preformed U-shaped wires 20, each U-shaped wire 20 comprising two legs 210, a connecting end 220, and two free ends 230. The plurality of U- shaped wires 20 are inserted into the slots 11 in the same direction.
  • the free ends 230 of the U-shaped wire 20 are twisted to form a conductive connection between the free ends 230 of adjacent U-shaped wires 20.
  • This conductive connection may be implemented, for example, by welding the free ends of adjacent U-shaped wires 20 together.
  • the legs 210 are represented by dots
  • the connecting ends 220 are represented by solid lines
  • the free ends 230 are represented by dashed lines
  • the dashed lines located between two adjacent legs 210 represent two free ends 230 extending from these legs 210.
  • the welding joints between adjacent free ends 230 are not shown in Fig. 4.
  • the number of poles of the fractional slot winding 2 is 44.
  • the least common multiple of the number of slots and the number of poles of the fractional slot winding 2 is 1056.
  • the ratio of the number of slots to the least common multiple of the number of slots and the number of poles is less than 1/11. This helps to reduce cogging torque and reduce noise.
  • the maximum common divisor between the number of slots and the number of poles of the fractional slot winding 2 is 4.
  • the maximum common divisor between the number of slots and the number of poles of the fractional slot winding 2 can be greater than 4, which is also conducive to the reduction of the noise of the motor. Therefore, it is particularly advantageous to set the fractional slot winding 2 as a 96-slot 44-pole winding.
  • the number of slots per pole and phase of this fractional slot winding 2 is not an integer.
  • the product of the number of slots per pole and phase of the fractional slot winding structure and 2 is not an integer.
  • the free ends 230 of the fractional slot winding 2 has a complex structure and a large volume.
  • the fractional slot winding 2 is configured as a 96-slot 44-pole three-phase winding
  • conventional wiring will cause the slot spans of the free ends 230 of each U-shaped wire 20 to vary greatly.
  • the end structure of the fractional slot winding 2 has a complex structure and a large volume, complicating the twisting operation of the free end 230s or even making it difficult to automate the twisting operation.
  • it also increases the difficulty of subsequent manufacturing steps, such as welding operations.
  • the U-shaped wires 20 may be arranged in a plurality of radial loops about a central axis L, with U-shaped wires 20 belonging to the same phase winding in series with each other in different loops.
  • the product of the number of slots per pole and phase of the fractional slot winding structure and the number of turns of the U- shaped wire 20 is not an integer.
  • the U-shaped wires 20 are arranged in 2 turns to form 4 layers of wires, i.e. , L1 , L2, L3, and L4 radially from inside to outside.
  • the free ends 230 located in the first and third layers are both twisted in the first circumferential direction and span the same angle about the center axis L, and the free ends 230 located in the second and fourth layers are both twisted in the second circumferential direction and span the same angle about the center axis L.
  • the free ends 230 of each U-shaped wire 20 span a slot 11 or a slot span of 1 at the second side 13 of the iron core 1. It can be seen that, in this example, for two adjacent legs 210 belonging to any two adjacent U-wires 20 of the plurality of U-wires 20, the free ends 230 extending from the two adjacent legs 210 span the same angle about the central axis L and spans respectively 50% of the slot span between two adjacent legs 210.
  • the free ends 230 extending from the two adjacent legs 210 may also be twisted in opposite circumferential directions with respect to each other and span different angles about the central axis L.
  • the free ends 230 located in the first layer may all be twisted in the first circumferential direction and span 0.5 slots about the central axis L, i.e. , spanning an angle corresponding to 0.5 slots
  • the free ends 230 located in the second layer may all be twisted in the second circumferential direction and span 1 .5 slots about the central axis L, i.e., spanning an angle corresponding to 1.5 slots.
  • the free ends 230 located in the third layer may be twisted in the first circumferential direction and span 0.5 slots about the central axis L like the free ends 230 located within the first layer, i.e., spanning an angle corresponding to 0.5 slots
  • the free ends 230 located in the fourth layer may be twisted in the second circumferential direction and span 1.5 slots about the central axis L like the free ends 230 located in the second layer, i.e., spanning an angle corresponding to 1 .5 slots.
  • the free ends 230 located in odd-numbered layers in a radially outward order are all twisted in the first circumferential direction and span the same angle about the central axis L
  • the free ends 230 located in even-numbered layers in a radially outward order are all twisted in the second circumferential direction and span the same angle about the central axis L.
  • the free ends 230 located in the third layer may be made to span about the central axis L at a different angle than the free ends 230 located in the first layer, e.g., spanning an angle corresponding to one slot, and the free ends 230 located in the fourth layer span about a central axis L at a different angle than the free ends 230 located in the second layer, e.g., spanning an angle corresponding to one slot.
  • FIG. 5 schematically illustrates the arrangement of the U-shaped wire 20 of the U-phase winding of the fractional slot winding structure shown in Fig. 4.
  • the leg 210 is denoted by a dot and the connecting end 220 is represented by a solid line.
  • the free end 230 is indicated by a dashed line.
  • the adjacent free ends 230 are welded, and the welding joints between the free ends 230 are schematically shown in Fig. 5 as squares, with solid lines indicating the connection end 220 is at a different height (in a direction perpendicular to the paper surface) in space from the welding point.
  • the U-phase winding comprises a lead-in wire 30, a lead-out wire 40, and at least one U-shaped wire 20 connected in series between the lead- in wire 30 and the lead-out wire 40.
  • the U-phase winding may comprise a lead-in wire 30, a lead-out wire 40, and the at least one U-shaped wire 20, thereby simplifying the manufacturing process.
  • the U-shaped wires 20 of the U-phase winding are arranged substantially in 2 turns about the central axis L, forming into 4 wire layers, i.e., L1 , L2, L3, and L4 radially from inside to outside.
  • the U-shaped wire 20 of the U-phase winding may comprise a first U-shaped wire, a second U-shaped wire, and a third U-shaped wire of different shapes.
  • the slot span between two legs 210 of the first U-shaped wire is 2
  • the slot span between two legs 210 of the second U-shaped wire is 3
  • the slot span between two legs 210 of the third U-shaped wire is 7. It can be seen that the slot spans of the two legs 210 differ considerably for the different shapes of the U-shaped wires 20.
  • the slot span between the two legs 210 of the third U-shaped wire is more than three times the slot span between the two legs 210 of the first U-shaped wire.
  • the first U-shaped wire 21 of the U-phase winding is a second U-shaped wire inserted into the third slot and the sixth slot from the first side 12;
  • the second U-shaped wire 22 of the U-phase winding is a first U-shaped wire inserted into the eighth slot and the tenth slot from the first side 12;
  • the third U-shaped wire 23 of the U-phase winding is a third U-shaped wire inserted into the 12th slot and the 19th slot from the first side 12.
  • the first free end 231 of the first U-shaped wire 21 twists in a clockwise direction (i.e. , in the left direction in Fig. 5) and spans one slot 11 in order to conductively connect with the lead- in wire 30.
  • the second free end 232 of the first U-shaped wire 21 twists in a counterclockwise direction starting at the 6 th slot (i.e., in the right direction in Fig. 5) and spans one slot, terminating at the 7th slot.
  • the first free end 231 of the second U-shaped wire 22 twists in a clockwise direction starting at the 8th slot and spans one slot, terminating at the 7th slot. Therefore, the conductive connection is formed between the second free end 232 of the U-shaped wire 21 of the first U-phase winding and the first free end 231 of the U-shaped wire 22 of the second U-phase winding.
  • the second free end 232 of the U-shaped wire 21 of the first U-phase winding may be welded together at the 7th slot with the first free end 231 of the U-shaped wire 22 of the second U-phase winding.
  • the second free end 232 of the U-shaped wire 22 of the second U-phase winding twists in a counterclockwise direction starting at the 10th slot and spans one slot, terminating at the 11th slot.
  • the first free end 231 of the third U-shaped wire 23 of the third U-phase winding twists in a clockwise direction starting at the 12th slot and spans one slot, terminating at the 11 th slot.
  • the second free end 232 of the U-shaped wire 22 of the second U-phase winding can be conveniently welded together with the first free end 231 of the U-shaped wire 23 of the adjacent third U-phase winding.
  • the other U-shaped wires 20 of the U-phase winding are similarly arranged as shown in Fig. 5.
  • V-phase and W-phase windings of the fractional slot winding 2 are similarly arranged as the U-phase winding, wherein the V-phase winding is offset by 16 slots 11 relative to the U-phase winding and the W-phase winding is offset by 32 slots 11 relative to the U- phase winding.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Windings For Motors And Generators (AREA)
  • Induction Machinery (AREA)

Abstract

Le modèle d'utilité concerne une structure d'enroulement à fente fractionnaire comprenant un noyau de fer pourvu d'une pluralité de fentes agencées dans une direction circonférentielle autour d'un axe central, et les fentes pénétrant d'un premier côté du noyau de fer à un second côté ; et un enroulement à fente fractionnaire comprenant une pluralité de fils en forme de U préformés, chaque fil en forme de U comprenant deux pattes, une extrémité de connexion et deux extrémités libres, la pluralité de fils en forme de U étant insérés dans les fentes dans la même direction de telle sorte que les extrémités de connexion sont toutes situées sur un premier côté du noyau de fer et les extrémités libres sont toutes situées sur un second côté du noyau de fer. Les portées de fente entre deux pattes de chaque fil en forme de U ne sont pas uniformes, et les portées de fente entre deux pattes adjacentes appartenant à deux fils en forme de U adjacents quelconques respectivement de la pluralité de fils en forme de U sont égales, les deux pattes adjacentes étant électriquement connectées l'une à l'autre par des extrémités libres s'étendant à partir de celles-ci. Le modèle d'utilité concerne également un moteur à fente fractionnaire. À l'aide du modèle d'utilité, la structure d'extrémité de la structure d'enroulement à fente fractionnaire peut être simplifiée.
PCT/EP2023/070103 2022-08-18 2023-07-20 Structure d'enroulement à fente fractionnaire et moteur à fente fractionnaire WO2024037817A1 (fr)

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CN202210993544.7 2022-08-18
CN202210993544.7A CN117639340A (zh) 2022-08-18 2022-08-18 分数槽绕组结构及其制造方法以及分数槽电机

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Citations (5)

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Publication number Priority date Publication date Assignee Title
US6894417B2 (en) * 2002-05-15 2005-05-17 Remy Inc. Multi-set rectangular copper hairpin windings for electric machines
US20070018525A1 (en) * 2005-07-21 2007-01-25 William Cai Multi-phase fractional slot windings for electric machines having segmented bar-shaped windings
US20200395804A1 (en) * 2019-06-12 2020-12-17 Ford Global Technologies, Llc Hairpin winding electric machine
US20210296956A1 (en) * 2018-09-05 2021-09-23 Miba Emobility Gmbh Stator for an electrical machine
US20210305869A1 (en) * 2020-03-27 2021-09-30 Aisin Seiki Kabushiki Kaisha Rotary electric machine

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6894417B2 (en) * 2002-05-15 2005-05-17 Remy Inc. Multi-set rectangular copper hairpin windings for electric machines
US20070018525A1 (en) * 2005-07-21 2007-01-25 William Cai Multi-phase fractional slot windings for electric machines having segmented bar-shaped windings
US20210296956A1 (en) * 2018-09-05 2021-09-23 Miba Emobility Gmbh Stator for an electrical machine
US20200395804A1 (en) * 2019-06-12 2020-12-17 Ford Global Technologies, Llc Hairpin winding electric machine
US20210305869A1 (en) * 2020-03-27 2021-09-30 Aisin Seiki Kabushiki Kaisha Rotary electric machine

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
ZHU SHAOHONG ET AL: "Design Approach of Hairpin Winding Motor with High Parallel Path Numbers", 2021 IEEE ENERGY CONVERSION CONGRESS AND EXPOSITION (ECCE), IEEE, 10 October 2021 (2021-10-10), pages 4534 - 4538, XP034020323, DOI: 10.1109/ECCE47101.2021.9595449 *

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