ELECTRIC MOTOR WITH STATOR INCLUDING COOLING FLUID turbulator SYSTEM

Abstract

A stator includes a plurality of stator laminations having an axial axis. The plurality of stator laminations includes coolant channels extending along an axial axis. The plurality of stator laminations includes a first stator lamination including a first plurality of openings. The first plurality of openings define a first portion of the coolant channel. The plurality of stator laminations includes a second stator lamination including a second web and a second plurality of openings. The second plurality of openings define a second portion of the coolant channel. The first stator lamination is stacked on the second stator lamination, where each of the first plurality of openings is offset relative to a corresponding one of the second plurality of openings such that in each of the first plurality of openings, a portion of the second web and a portion of the corresponding one of the second plurality of openings are exposed.

Description

Technical Field

[0001] The present disclosure relates to the field of vehicles, and more particularly, to a vehicle including an electric motor having a stator provided with a cooling fluid turbulator system. Background Art

[0002] Electric motors convert electrical energy into mechanical output. The electrical energy is fed into a stator that supports multiple windings. The electrical energy flowing through the windings generates a magnetic field, which acts on the rotor to generate rotational energy. The flow of electrical energy and the generation of the magnetic field, combined with the rotation of the rotor in the stator, generate heat. This heat, however, is not used to generate rotational energy, thus reducing the overall efficiency of the electric motor.

[0003] There are a variety of systems for cooling electric motors. The rotor may be equipped with a fan that either drives air through or draws air into the electric motor. A cooling fluid, such as a liquid coolant, may be introduced into the motor housing and passed through channels formed in the stator. The cooling fluid may be passed through a heat exchanger and recirculated through the motor. In many cases, the liquid coolant is introduced into the center portion of the stator and allowed to flow axially outward in both directions. While each approach can effectively reduce motor temperature, improvements in motor cooling are always welcome. Therefore, it would be desirable to provide a system that enhances heat exchange between the stator and the cooling fluid. Summary of the Invention

[0004] According to a non-limiting example, a stator for an electric machine includes a plurality of stator laminations defining a stator core having an axial axis. The plurality of stator laminations include a circumference, a radius, and a coolant passage extending along the axial axis. The plurality of stator laminations include a first stator lamination including a first web and a first plurality of openings extending through the first web and spaced apart around the circumference. The first plurality of openings define a first portion of the coolant passage. The plurality of stator laminations include a second stator lamination including a second web and a second plurality of openings extending through the second web and spaced apart around the circumference. The second plurality of openings define a second portion of the coolant passage. The first stator lamination is stacked on the second stator lamination, wherein each of the first plurality of openings is offset relative to a corresponding opening in the second plurality of openings along one of the circumference and the radius, such that in each of the first plurality of openings, a portion of the second web and a portion of the corresponding opening in the second plurality of openings are exposed.

[0005] In addition to one or more features described herein, the plurality of stator laminations includes a third stator lamination including a third web and a third plurality of openings extending through the third web and spaced circumferentially apart, the third plurality of openings defining a third portion of the coolant channel.

[0006] In addition to one or more features described herein, a third stator lamination is stacked on the second stator lamination, wherein each of the third plurality of openings is offset relative to a corresponding opening in the second plurality of openings along one of a circumference and a radius such that in each of the third plurality of openings, a portion of the second web and a portion of a corresponding opening in the first and second pluralities of openings are exposed.

[0007] In addition to one or more features described herein, each of the third plurality of openings is substantially aligned with a corresponding opening of the first plurality of openings.

[0008] In addition to one or more features described herein, the plurality of stator laminations includes a fourth stator lamination including a fourth web and a fourth plurality of openings extending through the fourth web and spaced circumferentially apart, the fourth plurality of openings defining a fourth portion of the coolant channel.

[0009] In addition to one or more features described herein, a fourth stator lamination is stacked on the third stator lamination, wherein each of the fourth plurality of openings is offset relative to a corresponding opening in the third plurality of openings along one of a circumference and a radius such that in each of the fourth plurality of openings, a portion of the third web and a portion of a corresponding opening in the third, first, and second pluralities of openings are exposed.

[0010] In addition to one or more features described herein, each of the fourth plurality of openings is substantially aligned with a corresponding opening of the second plurality of openings.

[0011] In addition to one or more features described herein, the first stator laminations define a first stator lamination set including a first number of stator laminations, the second stator laminations define a second stator lamination set including a second number of stator laminations, the third stator laminations define a third stator lamination set including a third number of stator laminations, and the fourth stator laminations define a fourth stator lamination set including a fourth number of stator laminations.

[0012] In addition to one or more features described herein, the second number of stator laminations is less than the first number of stator laminations, the third number of stator laminations is less than the second number of stator laminations, and the fourth number of stator laminations is less than the third number of stator laminations.

[0013] In addition to one or more features described herein, the stator includes a first axial end, a second axial end, and a center portion having a coolant inlet fluidly connected to the coolant passage, the first stator lamination stack being arranged at the coolant inlet, the second stator lamination stack being arranged directly adjacent to the first stator lamination stack, the third stator lamination stack being arranged directly adjacent to the second stator lamination stack, and the fourth stator lamination stack being arranged at one of the first axial end and the second axial end.

[0014] According to a non-limiting example, a vehicle includes a body including a passenger compartment, a rechargeable energy storage system (RESS) supported by the body, and an electric drive unit arranged in the body and operably connected to the RESS. The electric drive unit includes a housing having an inner surface, a stator fixedly mounted to the inner surface, and a rotor rotatably supported within the stator. The stator includes a plurality of stator laminations defining a stator core having an axial axis. The plurality of stator laminations include a circumference, a radius, and a coolant channel extending along the axial axis. The plurality of stator laminations include a first stator lamination, the first stator lamination including a first web and a first plurality of openings extending through the first web and spaced apart around the circumference. The first plurality of openings define a first portion of the coolant channel. The plurality of stator laminations include a second stator lamination, the second stator lamination including a second web and a second plurality of openings extending through the second web and spaced apart around the circumference. The second plurality of openings define a second portion of the coolant channel. The first stator laminations are stacked on the second stator laminations, wherein each of the first plurality of openings is offset relative to a corresponding opening of the second plurality of openings along one of a circumference and a radius such that in each of the first plurality of openings, a portion of the second web and a portion of a corresponding opening of the second plurality of openings are exposed.

[0015] In addition to one or more features described herein, the plurality of stator laminations includes a third stator lamination including a third web and a third plurality of openings extending through the third web and spaced circumferentially apart, the third plurality of openings defining a third portion of the coolant channel.

[0016] In addition to one or more features described herein, a third stator lamination is stacked on the second stator lamination, wherein each of the third plurality of openings is offset relative to a corresponding opening in the second plurality of openings along one of a circumference and a radius such that in each of the third plurality of openings, a portion of the second web and a portion of a corresponding opening in the first and second pluralities of openings are exposed.

[0017] In addition to one or more features described herein, each of the third plurality of openings is substantially aligned with a corresponding opening of the first plurality of openings.

[0018] In addition to one or more features described herein, the plurality of stator laminations includes a fourth stator lamination including a fourth web and a fourth plurality of openings extending through the fourth web and spaced circumferentially apart, the fourth plurality of openings defining a fourth portion of the coolant channel.

[0019] In addition to one or more features described herein, a fourth stator lamination is stacked on the third stator lamination, wherein each of the fourth plurality of openings is offset relative to a corresponding opening in the third plurality of openings along one of a circumference and a radius such that in each of the fourth plurality of openings, a portion of the third web and a portion of a corresponding opening in the third, first, and second pluralities of openings are exposed.

[0020] In addition to one or more features described herein, each of the fourth plurality of openings is substantially aligned with a corresponding opening of the second plurality of openings.

[0021] In addition to one or more features described herein, the first stator laminations define a first stator lamination set including a first number of stator laminations, the second stator laminations define a second stator lamination set including a second number of stator laminations, the third stator laminations define a third stator lamination set including a third number of stator laminations, and the fourth stator laminations define a fourth stator lamination set including a fourth number of stator laminations.

[0022] In addition to one or more features described herein, the second number of stator laminations is less than the first number of stator laminations, the third number of stator laminations is less than the second number of stator laminations, and the fourth number of stator laminations is less than the third number of stator laminations.

[0023] In addition to one or more features described herein, the stator includes a first axial end, a second axial end, and a center portion having a coolant inlet fluidly connected to the coolant passage, the first stator lamination stack being arranged at the coolant inlet, the second stator lamination stack being arranged directly adjacent to the first stator lamination stack, the third stator lamination stack being arranged directly adjacent to the second stator lamination stack, and the fourth stator lamination stack being arranged at one of the first axial end and the second axial end.

[0024] The above features and advantages and other features and advantages of the present disclosure will become apparent when the following detailed description is read in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Additional features, advantages, and details appear by way of example only in the following detailed description, which refers to the accompanying drawings, in which:

[0026] Figure 1 is a left side view of a vehicle including an electric drive unit having a stator including a cooling fluid turbulator system according to a non-limiting example;

[0027] Figure 2 is a cross-sectional side view of an electric motor portion of an electric drive unit including a stator having a cooling fluid turbulator system according to a non-limiting example;

[0028] Figure 3is taken along line 3-3 according to a non-limiting example Figure 2 a view of a portion of a stator of an electric motor portion of an electric drive unit;

[0029] Figure 4 According to non-limiting examples Figure 3 A partially exploded view of a stator;

[0030] Figure 5 According to non-limiting examples Figure 2 A partial cross-sectional view of a stator of an electric motor portion of an electric drive unit;

[0031] Figure 6 According to non-limiting examples Figure 2 a cross-sectional view of a stator of an electric motor portion of an electric drive unit, depicting a cooling fluid turbulator system;

[0032] Figure 7 According to another non-limiting example Figure 2 a cross-sectional view of a stator of an electric motor portion of an electric drive unit, depicting a cooling fluid turbulator system; and

[0033] Figure 8 According to another non-limiting example Figure 2 A cross-sectional view of the stator of the electric motor portion of an electric drive unit, depicting the cooling fluid turbulator system. DETAILED DESCRIPTION

[0034] The following description is merely exemplary in nature and is not intended to limit the present disclosure, its application, or uses. It should be understood that throughout the drawings, corresponding reference numerals indicate the same or corresponding parts and features.

[0035] According to a non-limiting example, the vehicle Figure 1 10. Vehicle 10 includes a body 12 supported on a plurality of wheels 16. Body 12 partially defines a passenger compartment 20 having a seat 23 positioned behind an instrument panel 26. A steering controller 30 is disposed between seat 23 and instrument panel 26. Steering controller 30 is operated to control the orientation of selected ones of the plurality of wheels 16. Vehicle 10 includes an electric motor, shown in the form of an electric drive unit 34, that provides power to one or more of the plurality of wheels 16.

[0036] A rechargeable energy storage system (RESS) or battery assembly 38 is disposed within the vehicle body 12 and provides power to the electric drive unit 34. At this point, it should be understood that the location of the electric drive unit 34 and the battery assembly 38 may vary. Figure 2An electric drive unit 34 according to a non-limiting example is described. The electric drive unit 34 includes a housing 48 having an outer surface 51 and an inner surface 53. The housing 48 includes a first axial end wall 56, a second axial end wall 58, and an intermediate wall 60 extending between and connected to the first axial end wall 56 and the second axial end wall 58. The inner surface 53 includes a first axial end face 63 associated with the first axial end wall 56 and a second axial end face 65 associated with the second axial end wall 58. The housing 48 also includes an annular inner surface 67 associated with the intermediate wall 60.

[0037] The first axial end wall 56 includes an opening 70 that receives a rotor shaft 72 that extends into and through the housing 48. The rotor shaft 72 defines a rotor or axial axis "A" that extends through the housing 48. The rotor shaft 72 is supported at the first axial end wall 56 by a first bearing 74. The rotor shaft 72 is supported at the second axial end wall 58 by a second bearing 76. The rotor shaft 72 supports a rotor 80 formed from a plurality of rotor laminations 82.

[0038] In a non-limiting example, the stator 86 is mounted to the annular inner surface 67. The stator 86 extends around the rotor 80 and includes a stator core 88 having a first axial end 90 and a second axial end 92 opposite the first axial end 90. The stator core 88 is further shown as including a center portion 94. The first axial end 90 is spaced from the first axial end wall 56 and the second axial end 92 is spaced from the second axial end wall 58. The stator core 88 is formed from a plurality of stator laminations 98 that support stator windings 100. The stator core 88 includes an outer surface 102 and an inner surface 104. The outer surface 102 defines a circumference "C" ( Figure 3 ). The radius "R" of the stator core 88 is defined between an inner surface 104 and an outer surface 102. Electrical energy provided by the RESS 38 induces a magnetic field in the rotor 80 through the stator windings 100. The magnetic field interacts with magnetic poles (not shown) or rotor windings (also not shown) supported by the rotor laminations 82, causing the rotor 80 to rotate about the axis "A" and transmit drive energy to selected wheels of the plurality of wheels 16.

[0039] In a non-limiting example, Figure 3 and 4 Shown and continue to refer to Figure 2 , the stator core 88 includes a plurality of coolant passages 108 extending through the stator laminations 98 between the first axial end 90 and the second axial end 92. The number of coolant passages 108 may vary. Furthermore, the coolant passages 108 may form an annular ring around the stator core 88. In a non-limiting example, the housing 48 includes an opening 112 ( Figure 2). The plurality of coolant passages 108 include a coolant inlet 114 in the center portion 94 that is fluidly connected to the opening 112, a first outlet 116 defined at the first axial end 90, and a second outlet 118 defined at the second axial end 92. Cooling fluid or coolant enters each of the plurality of coolant passages 108 through the opening 112. The coolant flows axially outward toward the first outlet 116 and the second outlet 118 and collects in the housing 48. The coolant can then pass through a heat exchanger (not shown) and be reintroduced into the stator 86 via the opening 112.

[0040] exist Figure 2 In the non-limiting example shown, the stator laminations 98 include a first stator lamination 122 disposed adjacent the coolant inlet 114, a second stator lamination 124 disposed between the first stator lamination 122 and the second axial end 92, a third stator lamination 126 disposed between the second stator lamination 124 and the second axial end 92, and a fourth stator lamination 128 disposed between the third stator lamination 126 and the second axial end 92. The fourth stator lamination 128 may define the second outlet 118 or may represent a lamination disposed between the third stator lamination 126 and the second outlet 118. In this regard, it should be understood that additional stator laminations in the plurality of stator laminations 98 of the stator core 88 extend between the opening 112 and the first axial end 90. Furthermore, the number of stator laminations may vary.

[0041] refer to Figure 4 And continue to refer to Figure 2 and 3 In a non-limiting example, the first stator lamination 122 includes a first web 134 and a first plurality of openings 136. The first plurality of openings 136 define first portions 138 of corresponding coolant channels in the plurality of coolant channels 108. The second stator lamination 124 includes a second web 142 having a second plurality of openings 144. The second plurality of openings 144 define second portions 146 of corresponding coolant channels in the plurality of coolant channels 108. The second stator lamination 124 is adjacent to the first stator lamination 122. In a non-limiting example, the second stator lamination 124 is circumferentially offset relative to the first stator lamination 122. In a non-limiting example, the circumferential offset can be an angle "σ" of up to approximately ±10°. In this manner, a portion of the second web 142 is exposed in each of the first plurality of openings 136.

[0042] In a non-limiting example, the third stator lamination 126 includes a third web 148 that includes a third plurality of openings 150. The third plurality of openings 150 form a third portion 152 of a corresponding coolant channel in the plurality of coolant channels 108. The third stator lamination 126 abuts the second stator lamination 124. In a non-limiting example, the third stator lamination 126 is circumferentially offset relative to the second stator lamination 124. In a non-limiting example, the circumferential offset can be an angle "σ" of up to approximately ±10°. In this manner, a portion of the third web 148 is exposed in each of the plurality of second openings 144. In a non-limiting example, the third plurality of openings 150 can be substantially aligned with corresponding openings in the first plurality of openings 136. The circumferential offset can be achieved by adjusting the position of each of the plurality of openings on one or more of the plurality of laminations 88 or by synchronizing (rotating) one or more laminations 88 relative to the other laminations in the plurality of laminations 88.

[0043] In a non-limiting example, the fourth stator lamination 128 includes a fourth web 154 having a fourth plurality of openings 156 that define fourth portions 158 of corresponding coolant channels in the plurality of coolant channels 108. The third stator lamination 126 abuts the third stator lamination 126. In a non-limiting example, the fourth stator lamination 128 is circumferentially offset relative to the third stator lamination 126. In a non-limiting example, the circumferential offset may be an angle "σ" of approximately 10°. In this manner, a portion of the fourth web 154 is exposed in each of the third plurality of openings 150. In a non-limiting example, the fourth plurality of openings 156 are substantially aligned with corresponding openings in the second plurality of openings 144.

[0044] like Figure 5 and 6As shown, the plurality of coolant channels 108 include a cooling fluid turbulator system 160 generated by the circumferential offset of the second stator laminations 124 relative to the first stator laminations 122 and the fourth stator laminations 128 relative to the third stator laminations 126. That is, the portion of the second web 142 exposed through the first plurality of openings 136 forms a first tripping surface 163, the portion of the third web 148 exposed in each of the second plurality of openings 144 forms a second tripping surface 165, and the portion of the fourth web 154 exposed in each of the third plurality of openings 150 forms a third tripping surface 167. With this arrangement, the cooling fluid passing through each coolant channel 108 impacts the first tripping surface 163, the second tripping surface 165, and the third tripping surface 167, generating localized turbulence, which enhances heat transfer from the stator laminations 98 to the cooling fluid. At this point, it should be understood that the number, thickness, and coolant-exposed area of the trip surfaces created in each coolant channel may vary, and there may be as few as only one trip surface.

[0045] In a non-limiting example, the first stator laminations 122 define a first stator lamination set 180 formed by a first number of stator laminations 98, the second stator laminations 124 define a second stator lamination set 184 defined by a second number of stator laminations 98, the third stator laminations 126 define a third stator lamination set 188 defined by a third number of stator laminations 98, and the fourth stator laminations 128 define a fourth stator lamination set 192 defined by a fourth number of stator laminations 98. In a non-limiting example, the first number of the plurality of stator laminations 98 is greater than the second number of stator laminations 98. The second number of stator laminations 98 is greater than the third number of stator laminations 98, and the third number of stator laminations 98 is greater than the fourth number of stator laminations 98.

[0046] With this configuration, the cooling fluid turbulator system 160 increases turbulence in the cooling fluid as it flows from the coolant inlet 114 toward, for example, the second outlet 118. That is, when initially introduced into the coolant inlet 114, the cooling fluid is at its lowest temperature and, therefore, has a greater heat-carrying capacity, such as upon entering the coolant passages 108. Consequently, the need for turbulence is low. Lower turbulence results in a lower local heat transfer coefficient (HTC), which offsets the higher local temperature differences between the stator core 88 and the cooling fluid, thereby achieving a substantially constant temperature gradient across the plurality of stator laminations 98. As the cooling fluid absorbs heat from the plurality of stator laminations 98, the ability to absorb more heat decreases. Applying turbulence at this stage increases the cooling fluid's heat-carrying / heat-absorbing capacity. Consequently, the number of laminations in each lamination stack decreases as the distance from the coolant inlet 114 increases.

[0047] At this point, it should be understood that the disclosed non-limiting example describes a system for imparting turbulence to a cooling fluid passing through a stator to increase heat transfer. The cooling fluid passes axially through the stator, impinging on a plurality of tripping surfaces that create a localized circumferential motion of the cooling fluid to generate turbulence. The amount of turbulence generated varies as the distance from the cooling fluid inlet increases. Furthermore, while described as a circumferential offset of approximately 10°, the amount and direction of the offset can vary. That is, instead of a circumferential offset, the stator 86 can include, for example, Figure 7 240 , wherein trip surfaces 244 , 246 , 248 , 250 , and 252 are formed by establishing radial offsets of openings (not separately labeled, formed in stator laminations 98 ).

[0048] Furthermore, it should be understood that by changing Figure 8 The offset and corresponding tripping surface can be achieved by varying the size of the openings in each lamination as shown, or by varying the geometry or shape of each opening. In this case, the openings themselves are not offset relative to one another, but rather the offset and corresponding tripping surface are created by varying the geometry of the openings. Thus, the term "offset" should be understood to mean changing the orientation of an opening in a lamination, rotating or synchronizing a lamination relative to other laminations, or by varying the geometry of one or more of the plurality of openings.

[0049] The terms "a" and "an" do not indicate a limitation of quantity, but rather indicate the presence of at least one of the referenced item. The term "or" means "and / or" unless the context clearly indicates otherwise. References to "an aspect" throughout this specification mean that a particular element (e.g., feature, structure, step, or characteristic) described in conjunction with that aspect is included in at least one aspect described herein and may or may not be present in other aspects. Furthermore, it should be understood that the described elements may be combined in any suitable manner in various aspects.

[0050] The terms "about" and "substantially" are intended to include the degree of error associated with measurement of a particular quantity based on the equipment available at the time the application is filed. For example, "about" and / or "substantially" may include a range of ±8%, 5%, or 2% of a given value.

[0051] When an element such as a layer, film, region, or substrate is referred to as being "on" another element, it can be directly on the other element or intervening elements may also be present. In contrast, when an element is referred to as being "directly on" another element, there are no intervening elements present.

[0052] Unless otherwise indicated herein, all test standards are the most recent standards in effect as of the filing date of this application or, if priority is claimed, the filing date of the earliest priority application in which the test standards appear.

[0053] Unless defined otherwise, technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure belongs.

[0054] Although the above disclosure has been described with reference to exemplary embodiments, it will be understood by those skilled in the art that various changes may be made and equivalents may be substituted for elements thereof without departing from the scope thereof. In addition, many modifications may be made to adapt a particular situation or material to the teachings of the present disclosure without departing from the essential scope of the present disclosure. Therefore, it is intended that the present disclosure is not limited to the particular embodiments disclosed, but is intended to include all embodiments falling within its scope.

Claims

1. A stator for a motor, comprising: a plurality of stator laminations defining a stator core having an axial axis, the plurality of stator laminations including a circumference, a radius, and a coolant channel extending along the axial axis, wherein the plurality of stator laminations includes a first stator lamination, the first stator lamination including a first web and a first plurality of openings extending through the first web and spaced circumferentially apart, the first plurality of openings defining a first portion of the coolant passage, wherein the plurality of stator laminations includes a second stator lamination, the second stator lamination including a second web and a second plurality of openings extending through the second web and spaced circumferentially apart, the second plurality of openings defining a second portion of the coolant passage, and wherein a first stator lamination is stacked on a second stator lamination, wherein each of the first plurality of openings is offset relative to a corresponding opening of the second plurality of openings along one of a circumference and a radius such that in each of the first plurality of openings, a portion of the second web and a portion of a corresponding opening of the second plurality of openings are exposed.

2. The stator according to claim 1, wherein: The plurality of stator laminations includes a third stator lamination including a third web and a third plurality of openings extending through the third web and spaced about the circumference, the third plurality of openings defining a third portion of the coolant passage.

3. The stator according to claim 2, wherein: The third stator laminations are stacked on the second stator laminations, wherein each of the third plurality of openings is offset relative to a corresponding opening of the second plurality of openings along one of the circumference and the radius such that in each of the third plurality of openings, a portion of the second web and a portion of a corresponding opening of the first and second pluralities of openings are exposed.

4. The stator according to claim 3, wherein: Each of the third plurality of openings is substantially aligned with a corresponding opening of the first plurality of openings.

5. The stator according to claim 4, wherein: The plurality of stator laminations includes a fourth stator lamination including a fourth web and a fourth plurality of openings extending through the fourth web and spaced about the circumference, the fourth plurality of openings defining a fourth portion of the coolant channel.

6. The stator according to claim 5, wherein: The fourth stator lamination is stacked on the third stator lamination, wherein each of the fourth plurality of openings is offset relative to a corresponding opening of the third plurality of openings along one of the circumference and the radius such that in each of the fourth plurality of openings, a portion of the third web and a portion of a corresponding opening of the third, first, and second pluralities of openings are exposed.

7. The stator according to claim 6, wherein: Each of the fourth plurality of openings is substantially aligned with a corresponding opening of the second plurality of openings.

8. The stator according to claim 5, wherein: The first stator laminations define a first stator lamination set including a first number of stator laminations, the second stator laminations define a second stator lamination set including a second number of stator laminations, the third stator laminations define a third stator lamination set including a third number of stator laminations, and the fourth stator laminations define a fourth stator lamination set including a fourth number of stator laminations.

9. The stator according to claim 8, wherein: The second number of stator laminations is less than the first number of stator laminations, the third number of stator laminations is less than the second number of stator laminations, and the fourth number of stator laminations is less than the third number of stator laminations.

10. A vehicle comprising: the body of the vehicle including the passenger compartment; a rechargeable energy storage system (RESS) supported by the vehicle body; as well as An electric drive unit comprising the stator according to claim 1 , the electric drive unit being arranged in a vehicle body and operatively connected to the RESS.

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