Motor and vehicle driving system

Abstract

The present application provides a motor, comprising: a busbar (3), wherein the busbar (3) comprises a controller busbar (31) and a motor busbar (32), the controller busbar (31) is used for connecting to a controller (200), the motor busbar (32) is used for connecting to a winding of a stator of the motor, and the controller busbar (31) and the motor busbar (32) are connected together; an insulating base (1), wherein the controller busbar (31) is connected to the insulating base (1); and an insulating cover (2), wherein the insulating cover (2) defines a cooling oil cavity (22), the connection position of the controller busbar (31) and the motor busbar (32) is located inside the cooling oil cavity (22), and the connection position can be at least partially immersed in cooling oil in the cooling oil cavity (22). Also provided is a vehicle driving system.

Description

Motor and vehicle drive system TECHNICAL FIELD

[0001] The present application relates to a drive system of an electric vehicle or a hybrid vehicle and components thereof, in particular to a motor and vehicle drive system. BACKGROUND

[0002] The vehicle drive system includes a motor and a power electronic integrated module (PEU, hereinafter referred to as controller), and the busbars of the motor and the busbars of the controller are in contact and connected, and the heat generated at the connection position is high, which is easy to burn the motor or the controller. It is necessary to continuously cool the connection position of the busbar during operation to avoid overheating and burning the motor or the controller.

[0003] For oil-cooled vehicle drive systems, the connection position of the busbar is usually cooled by oil injection.

[0004] In patent application CN113922567A, patent application CN113922588A and patent CN217087692U, the cooling oil is injected into the busbar through the oil injection channel of the shell and then through the oil hole.

[0005] However, the contact time between the cooling oil and the busbar is short after the cooling oil is injected into the busbar, the heat exchange is not sufficient, and the cooling effect is not good. In addition, in actual use, the inclination angle of the vehicle drive system may also affect the injection effect. In extreme cases, the injection may not reach the connection position of the busbar, but only to the position near the busbar, which will further weaken the cooling effect.

[0006] In patent CN219843494U, the insulating seat is provided with a cooling groove, and the cooling groove and the busbar form a cooling cavity, and the cooling oil in the cooling cavity can directly contact the busbar to cool the busbar.

[0007] However, the cooling groove of the insulating seat cooperates with the bottom surface of the busbar, and the area of the cooling groove is smaller than that of the copper bar, so that only one side surface of the busbar is in contact with the cooling oil, the contact area between the cooling oil and the busbar is small, and the heat exchange effect is poor. And the insulating seat needs to be processed with three cooling grooves to form three cooling cavities, so that the size of the insulating plate is large, the processing is complex, and it is not conducive to the overall layout.

[0008] SUMMARY

[0009] Therefore, the present application aims to provide a motor with good cooling effect on the connection position of the busbar.

[0010] The embodiment of the present application provides a motor, comprising:

[0011] Busbars including a controller busbar for connecting a controller and a motor busbar for connecting windings of a stator of the motor, the controller busbar and the motor busbar being connected together;

[0012] An insulating seat to which the controller busbar is connected; and

[0013] An insulating cover defining a cooling oil cavity, a connection position of the controller busbar and the motor busbar being located inside the cooling oil cavity, the connection position being at least partially immersed in cooling oil in the cooling oil cavity.

[0014] In at least one possible implementation, the insulating seat includes an insulating seat body and a nut connected to the insulating seat body, the busbars further include a busbar connecting bolt, the controller busbar and the motor busbar are connected together by cooperation of the busbar connecting bolt and the nut, the insulating cover and the insulating seat body enclose to define the cooling oil cavity.

[0015] In at least one possible implementation, surfaces of the controller busbar and the motor busbar do not conform to the insulating seat body and / or the insulating cover at least at the connection position of the controller busbar and the motor busbar.

[0016] In at least one possible implementation, the insulating seat body includes a nut mounting portion, the nut is partially embedded in the nut mounting portion, the nut protrudes from a nut mounting surface of the nut mounting portion,

[0017] The controller busbar includes a controller busbar motor connecting segment connected to the motor busbar,

[0018] The controller busbar motor connecting segment and the nut mounting surface of the nut mounting portion are parallel, the controller busbar motor connecting segment and the nut are in contact, thereby forming a gap between the controller busbar motor connecting segment and the nut mounting surface of the nut mounting portion.

[0019] In at least one possible implementation, the cooling oil cavity is provided with an oil outlet, the insulating cover is provided with an outflow shielding portion configured to partially shield the oil outlet to slow down the speed of outflow of cooling oil from the cooling oil cavity.

[0020] In at least one possible implementation, the insulating cover and the nut mounting portion are tightly connected together, so that a side of the cooling oil cavity is sealed.

[0021] In at least one possible implementation, the insulating seat body, the nut and the controller busbar are connected together by injection molding.

[0022] In at least one possible implementation, the insulating cover and the insulating seat are connected together by snap fitting.

[0023] In at least one possible implementation, the motor has a motor cavity accommodating a stator and a rotor of the motor and a controller cavity accommodating a controller of the motor, a portion of the insulating seat is located in the controller cavity, another portion of the insulating seat, the insulating cover and the motor busbar are located in the motor cavity.

[0024] The embodiments of the present application also propose a vehicle driving system comprising the motor according to any one of the above technical solutions.

[0025] By setting the connection positions of the controller busbar and the motor busbar in the cooling oil cavity, the cooling oil in the cooling oil cavity can immerse the connection positions of the busbars and the busbar connecting bolts, so that the busbars and the cooling oil can be fully heat exchanged, thereby achieving better cooling effect.

[0026] Other features and aspects of the present application will become apparent from the following detailed description of exemplary embodiments, taken in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF DRAWINGS

[0027] The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate exemplary embodiments, features, and aspects of the present application and serve to explain the principles of the present application.

[0028] FIG. 1 shows a partial structural schematic diagram of a motor of a vehicle power system according to an embodiment of the present application.

[0029] FIG. 2 shows a partial structural schematic diagram of the motor of the vehicle power system from another angle according to an embodiment of the present application.

[0030] FIG. 3 shows a partial enlarged view of the motor (without the insulating cover) of the vehicle power system according to an embodiment of the present application.

[0031] FIG. 4 shows a structural schematic diagram of an insulating seat of the motor of the vehicle power system according to an embodiment of the present application.

[0032] FIG. 5 shows a structural schematic diagram of the insulating seat of the motor of the vehicle power system from another angle according to an embodiment of the present application.

[0033] FIG. 6 shows a sectional view of the insulating seat of the motor of the vehicle power system according to an embodiment of the present application.

[0034] FIG. 7 shows a structural diagram of an insulating cover of a motor of a vehicle power system according to an embodiment of the present application.

[0035] FIG. 8 shows a structural diagram of the insulating cover of the motor of the vehicle power system according to an embodiment of the present application from another angle.

[0036] FIG. 9 shows a structural diagram of a housing of a motor body of the motor of the vehicle power system according to an embodiment of the present application.

[0037] FIG. 10 shows a partial cutaway perspective view of the motor of the vehicle power system according to an embodiment of the present application.

[0038] FIG. 11 shows a partial cutaway perspective view of the motor of the vehicle power system according to an embodiment of the present application along another cross section.

[0039] FIG. 12 shows an elevation view of FIG. 11.

[0040] FIG. 13A shows an internal cavity of the motor of the vehicle power system according to an embodiment of the present application.

[0041] FIG. 13B shows the internal cavity of the motor of the vehicle power system according to an embodiment of the present application using solids.

[0042] List of Reference Numerals

[0043] 100 motor body

[0044] 200 controller

[0045] 101 housing

[0046] 1011 insulating base mounting hole

[0047] 1012 housing oil passage

[0048] 1013 insulating cover mounting hole

[0049] 102 stator

[0050] 1 insulating base

[0051] 11 insulating base body

[0052] 12 nut

[0053] 13 bolt

[0054] 111 insulating base housing inner portion

[0055] 1111 nut mounting portion

[0056] 1112 flange

[0057] 112 insulating seat housing outer portion

[0058] 113 seal ring mounting groove

[0059] 114 insulating seat mounting bolt hole

[0060] 2 insulating cover

[0061] 21 oil inlet

[0062] 22 cooling oil cavity

[0063] 23 outflow barrier

[0064] 24 buckle

[0065] 25 oil inlet seal ring

[0066] 26 oil outlet

[0067] 27 insulating cover bolt

[0068] 3 busbar

[0069] 31 controller busbar

[0070] 311 controller busbar motor connection section

[0071] 312 controller busbar controller connection section

[0072] 32 motor busbar

[0073] 321 motor busbar motor connection section

[0074] 322 motor busbar controller connection section

[0075] 33 busbar connecting bolt DETAILED DESCRIPTION

[0076] Various exemplary embodiments, features, and aspects of the present application will be described herein in detail with reference to the drawings. Like reference numerals in the drawings denote the same or similar elements. Although various aspects of the embodiments are illustrated in the drawings, the drawings are not necessarily drawn to scale unless specifically indicated.

[0077] The term "exemplary" is used herein to mean "serving as an example, instance, or illustration." Any implementation described herein as "exemplary" is not necessarily to be construed as preferred or advantageous over other implementations.

[0078] In addition, for a better understanding of the present application, a number of specific details are set forth in the following detailed description. Those skilled in the art will understand that the application can be practiced without certain of the specific details set forth in the following detailed description. In other instances, well-known methods, procedures, components and circuits have not been described in detail so as not to obscure the underlying principles of the application.

[0079] As shown in FIGS. 1-13B, embodiments of the present application provide a vehicle power system, which can be particularly applied to a pure electric vehicle or a hybrid electric vehicle. The vehicle power system includes an electric machine.

[0080] The electric machine includes an electric machine body 100 and a controller 200 (PEU, power electronic integrated module), which can be electrically connected.

[0081] The electric machine body 100 includes a housing 101, a stator 102, a rotor, and a busbar oil cooling device.

[0082] The electric machine has an electric machine cavity accommodating the stator 102 and the rotor of the electric machine, and a controller cavity accommodating the controller 200 of the electric machine, the housing 101 can define the electric machine cavity, the busbar oil cooling device can be installed on the housing 101, and the busbar oil cooling device can be partially disposed inside the electric machine cavity. The controller 200 can be installed on the housing 101, and the controller 200 can be disposed outside the electric machine cavity.

[0083] As shown in FIGS. 1-3, the busbar oil cooling device includes an insulating seat 1, an insulating cover 2, and a busbar 3. The insulating cover 2 and the insulating seat 1 can be installed on the housing 101, and the busbar 3 is used to electrically connect the electric machine body 100 and the controller 200.

[0084] As shown in FIGS. 1, 3-6, the busbar 3 (or called busbar, copper bar) includes a controller busbar 31, an electric machine busbar 32, and a busbar connecting bolt 33. The controller busbar 31 and the electric machine busbar 32 can be connected together through the busbar connecting bolt 33. The busbar oil cooling device is particularly used to cool the connecting part of the controller busbar 31 and the electric machine busbar 32.

[0085] The controller busbar 31 includes a controller busbar electric machine connecting section 311 and a controller busbar controller connecting section 312. The controller busbar controller connecting section 312 is connected to the controller 200, and the controller busbar electric machine connecting section 311 is connected to the electric machine busbar 32.

[0086] The motor bus 32 includes a motor bus motor connecting section 321 and a motor bus controller connecting section 322. The stator 102 includes a stator core and windings, the motor bus motor connecting section 321 is connected to the windings of the stator 102, and the motor bus controller connecting section 322 is connected to the controller bus motor connecting section 311.

[0087] As shown in FIGS. 1-6 and 10, 11, the insulating seat 1 includes an insulating seat body 11 and a nut 12. The controller bus 31 can be connected to the insulating seat body 11, the insulating seat body 11 can be made of insulating material, and the insulating seat body 11 surrounds the controller bus 31 to separate the controller bus 31 from the housing 101.

[0088] The insulating seat body 11 includes an insulating seat housing inner portion 111 and an insulating seat housing outer portion 112. The insulating seat housing inner portion 111 can be located inside the motor cavity, and the insulating seat housing outer portion 112 can be located outside the motor cavity. The housing 101 is provided with an insulating seat mounting hole 1011 for partially inserting the insulating seat 1 into the interior of the motor cavity, and the insulating seat housing inner portion 111 and the partial controller bus 31 can be inserted into the motor cavity via the insulating seat mounting hole 1011. The housing 101 is provided with an insulating seat mounting threaded hole.

[0089] The insulating seat housing outer portion 112 can be provided with an insulating seat mounting bolt hole 114, and the insulating seat 1 can be connected to the insulating seat mounting hole 1011 of the housing 101 by screwing the bolt 13 through the insulating seat mounting bolt hole 114 into the insulating seat mounting threaded hole.

[0090] The insulating seat housing inner portion 111 includes a nut mounting portion 1111, which can include a flat plate portion. The nut 12 can be fixedly connected to the nut mounting portion 1111, and the nut 12 and the bus connecting bolt 33 cooperate to connect the controller bus 31 and the motor bus 32 together.

[0091] At least at the connection position of the controller bus 31 and the motor bus 32, the surfaces of the controller bus 31 and the motor bus 32 are not in contact with the insulating seat body 11 and / or the insulating cover 2.

[0092] Specifically, the nut 12 can be partially embedded in the nut mounting portion 1111, and the nut 12 can protrude from the nut mounting surface of the nut mounting portion 1111. The controller busbar motor connecting segment 311 can be parallel to the nut mounting surface of the nut mounting portion 1111, and the controller busbar motor connecting segment 311 can be in contact with the nut 12. The nut protruding from the nut mounting surface of the nut mounting portion 1111 allows a gap to be formed between the controller busbar motor connecting segment 311 and the nut mounting surface of the nut mounting portion 1111, so that the cooling oil can flow through the gap, allowing the cooling oil to contact multiple surfaces of the controller busbar motor connecting segment 311, and the cooling effect is better.

[0093] In at least one possible implementation, the insulating seat body 11, the nut 12, and the controller busbar 31 can be connected together by injection molding. The controller busbar motor connecting segment 311 can extend from the insulating seat housing inner portion 111 to the inside of the motor cavity, and the controller busbar controller connecting segment 312 can extend from the insulating seat housing outer portion 112 to the outside of the motor cavity.

[0094] As shown in FIG. 5, a sealing ring mounting groove 113 can be provided between the insulating seat housing inner portion 111 and the insulating seat housing outer portion 112, and the sealing ring mounting groove 113 can accommodate a sealing ring. The sealing ring can cooperate with the peripheral wall of the insulating seat mounting hole 1011 to keep the motor cavity sealed and prevent the cooling oil from leaking.

[0095] The mounting hole 114 is provided on the insulating seat body 11, and the insulating seat 1 can be mounted on the housing 101 by passing a bolt through the mounting hole 114 and screwing it into the housing.

[0096] As shown in FIGS. 7, 8, 9-12, the insulating cover 2 can be buckled on the surface of the insulating seat 1, and a cooling oil cavity 22 can be defined between the insulating cover 2 and the insulating seat 1. The insulating cover 2 can be buckled on the insulating seat housing inner portion 111.

[0097] The housing 101 is provided with an insulating cover mounting hole 1013, and the insulating cover 2 can be mounted on the housing 101 by cooperating the insulating cover bolt 27 with the insulating cover mounting hole 1013.

[0098] The connection position of the controller busbar 31 and the motor busbar 32 is located inside the cooling oil cavity 22, so that the cooling oil in the cooling oil cavity 22 can surround the connection position of the busbar and the busbar connecting bolt 33. At least part of the front and back surfaces and the side surface of the controller busbar 31 and the motor busbar 32 can be directly in contact with or even immersed in the cooling oil, and the busbar 3 and the cooling oil can fully exchange heat. In particular, the connection position of the controller busbar 31 and the motor busbar 32 can be at least partially immersed in the cooling oil, so that the cooling effect is better.

[0099] As shown in FIGS. 8-10, 13A and 13B, the housing 101 can be provided with a housing oil passage 1012, and the insulating cover 2 can be provided with an oil inlet 21 which is in communication with the housing oil passage 1012. Alternatively, the oil inlet 21 can be inserted into the housing oil passage 1012, and an oil inlet sealing ring 25 can be provided between the oil inlet 21 and the housing oil passage 1012 to prevent leakage of the cooling oil.

[0100] The cooling oil cavity 22 can be provided with an oil outlet 26 through which the cooling oil in the cooling oil cavity 22 can flow out.

[0101] Further, the insulating cover 2 can be provided with an outflow blocking portion 23 which can be configured to partially block the oil outlet 26. The outflow blocking portion 23 can be located at the bottom of the cooling oil cavity 22, and a small gap can be formed between the outflow blocking portion 23 and the busbar 3, so that the cooling oil in the cooling oil cavity 22 can flow out slowly, and thus the cooling oil can have a longer time to contact the busbar 3 for sufficient heat exchange.

[0102] As shown in FIGS. 8-12, the insulating cover 2 can be provided with a buckle 24, and the nut mounting portion 1111 of the insulating base 1 can be provided with a flange 1112 which can be in the form of a strip. The buckle 24 can be used to buckle the flange 1112 to facilitate close connection of the insulating cover 2 and the insulating base 1, so that the insulating cover 2 can be closely attached to the flat nut mounting portion 1111, and thus the side of the cooling oil cavity 22 can be relatively sealed to reduce leakage of the oil through the gap between the insulating cover 2 and the insulating base 1.

[0103] Although the cooling oil cavity 22 does not require strict sealing, such relative sealing can make as much oil as possible flow out of the oil outlet 26 and less leak from other positions, so that as much oil as possible can stay in the cooling oil cavity 22 for a longer time, and thus the cooling oil can have sufficient heat exchange with the busbar 3 (including the controller busbar 31 and the motor busbar 32).

[0104] The controller busbar 31 and the motor busbar 32 can each include a plurality of conductive bars, for example, three conductive bars, and the connection positions of the plurality of conductive bars can be located inside the same cooling oil cavity 22.

[0105] FIG. 13A uses perspective drawing to represent the cavity portion inside the entity which cannot be observed by naked eyes, and FIG. 13B uses solid to represent the cavity portion through which the oil flows. The single arrow in FIG. 13B represents the flow direction of the cooling oil, and the cooling oil can flow from the housing oil passage 1012 to the cooling oil cavity 22.

[0106] (1) In the above embodiment, the insulating cover 2 and the insulating seat 1 enclose the cooling oil cavity 22, but the present application is not limited thereto, and in other possible embodiments, the insulating cover can enclose an oil cavity with the housing of the motor, as long as the connection position of the busbar is located in the cooling oil cavity.

[0107] (2) In the above embodiment, a narrow gap can be formed between the outflow blocking portion 23 and the motor busbar 32, but the present application is not limited thereto, and in other possible embodiments, the outflow blocking portion can have other structures or forms.

[0108] (3) In the above embodiment, the insulating cover 2 and the nut mounting portion 1111 are tightly connected together by the cooperation of the buckle 24 and the flange 1112, but the present application is not limited thereto, and in other possible embodiments, other means such as a sealing strip or a sealing ring can be used to tightly connect the insulating cover and the nut mounting portion together.

[0109] The busbar oil cooling device, the motor, and the vehicle driving system of the present application can obtain the following beneficial effects.

[0110] (1) By setting the connection position of the controller busbar 31 and the motor busbar 32 in the cooling oil cavity 22, the connection position of the busbar and the busbar connecting bolt 33 can be immersed in the cooling oil of the cooling oil cavity 22, and the busbar and the cooling oil can be fully heat exchanged, thereby achieving good cooling effect.

[0111] (2) Even if the position of the motor or the vehicle driving system is inclined or in a jolt vibration state, the connection position of the busbar and the busbar connecting bolt 33 can still contact the cooling oil, so the busbar can be cooled in the inclined or jolt vibration state.

[0112] (3) The surfaces of the controller busbar 31 and the motor busbar 32 are not attached to the insulating seat body 11 and / or the insulating cover 2, the contact area of the busbar with the cooling oil is large, the heat exchange area is large, and therefore the cooling speed is fast and the cooling effect is good.

[0113] (4) The connection of the insulating cover 2 and the insulating seat is simple and reliable, easy to disassemble and assemble, and the structures of the components are simple and easy to process.

[0114] It should be understood that at least some aspects or features of the above embodiments, examples or examples can be appropriately combined.

[0115] It can be understood that, in the present application, the number of components or members is one or more when the number of components or members is not particularly limited, and the plurality herein refers to two or more. For the case where the number of components or members is specifically described as, for example, two, three, four, etc. in the drawings and / or the description, the specific number is generally exemplary and not restrictive, and it can be understood as a plurality, i.e., two or more, but this does not mean that the present application excludes the case of one.

[0116] In the present application, unless otherwise explicitly stated or limited, the terms "mounting", "assembly", "assembly", "connection", "connection", "coupling", "connection", "abutment", "communication", "communication", "conduction", "fixing", "fastening", etc. should be understood broadly, for example, it can be direct or indirect. For example, in terms of connection, it can be a fixed connection, or a detachable connection, or integrated; it can be a mechanical connection, or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, or the communication or interaction relationship between two elements, unless otherwise explicitly stated or limited. For example, in terms of communication / conduction, etc., it can be direct communication / conduction, or indirect communication / conduction via an intermediate medium. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0117] In the present application, unless otherwise explicitly stated or limited, one member is disposed in / installed in / located in / contained in / placed in another member, etc. can be any of the following two cases: a part or most of the one member is located in the other member; and the one member is completely contained in the other member.

[0118] Although the present application has been described in detail using the above embodiments, it is clear to those skilled in the art that the present application is not limited to the embodiments described in the present specification. The present application can be modified and implemented as a modified embodiment without departing from the spirit and scope of the present application defined by the claims. Therefore, the description in the present specification is for the purpose of illustration, and has no any limiting meaning on the present application.

Claims

1. An electric machine characterized in that, The busbar (3) includes a controller busbar (31) for connecting a controller (200) and a motor busbar (32) for connecting windings of a stator of the motor, and the controller busbar (31) and the motor busbar (32) are connected together. The insulating seat (1) is connected to the controller busbar (31), and the insulating cover (2) defines a cooling oil cavity (22) inside which a connection position of the controller busbar (31) and the motor busbar (32) is located, and the connection position can be at least partially immersed in cooling oil in the cooling oil cavity (22). The insulating seat (1) includes an insulating seat body (11) and a nut (12) connected to the insulating seat body (11), the busbar (3) further includes a busbar connecting bolt (33), the controller busbar (31) and the motor busbar (32) are connected together by cooperation of the busbar connecting bolt (33) and the nut (12), and the insulating cover (2) and the insulating seat body (11) surround to define the cooling oil cavity (22). At least at the connection position of the controller busbar (31) and the motor busbar (32), the surfaces of the controller busbar (31) and the motor busbar (32) are not attached to the insulating seat body (11) and / or the insulating cover (2).

2. The electric machine of claim 1, wherein, The insulating seat body (11) includes a nut mounting portion (1111), the nut (12) is partially embedded in the nut mounting portion (1111), the nut (12) protrudes from a nut mounting surface of the nut mounting portion (1111), 3. The electric machine of claim 2, wherein, The controller busbar (31) includes a controller busbar motor connecting section (311) connected to the motor busbar (32), 4. The electric machine of claim 2, wherein, The controller busbar motor connecting section (311) and the nut mounting surface of the nut mounting portion (1111) are parallel, the controller busbar motor connecting section (311) and the nut (12) are in contact, thereby forming a gap between the controller busbar motor connecting section (311) and the nut mounting surface of the nut mounting portion (1111). The cooling oil cavity (22) is provided with an oil outlet (26), and the insulating cover (2) is provided with an outflow shielding portion (23) configured to partially shield the oil outlet (26) to slow down the flow rate of cooling oil flowing out of the cooling oil cavity (22). The insulating cover (2) and the nut mounting portion (1111) are tightly connected together, so that a side portion of the cooling oil cavity (22) is sealed. The insulating seat body (11), the nut (12) and the controller busbar (31) are connected together by injection molding.

5. The electric machine of claim 1, wherein, The insulating cover (2) and the insulating seat (1) are connected together by buckling.

6. The electric machine of claim 4, wherein, ​ 7. The electric machine of claim 2, wherein, ​ 8. The electric machine of claim 1, wherein, ​ 9. The electric machine of claim 1, wherein, The electric machine has a machine cavity accommodating a stator and a rotor of the electric machine and a controller cavity accommodating a controller of the electric machine, a portion of the insulating seat (1) being located within the controller cavity, another portion of the insulating seat (1), the insulating cover (2) and the machine busbar (32) being located within the machine cavity.

10. A vehicle drive system characterized by comprising: An electric machine comprising the features of any one of claims 1 to 9. An electric machine comprising the features of any one of claims 1 to 9.

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