CN219678212U - Motor, power assembly and electric vehicle - Google Patents

Abstract

The utility model provides a motor, a power assembly and an electric vehicle. The motor includes a stator core 110, a housing 120, and at least one seal 130. The outer surface of the stator core 110 includes an annular groove 111 and a plurality of axial protrusions 112, the plurality of axial protrusions 112 being arranged at intervals along the circumference of the stator core 110, the annular groove 111 being disposed along the axial direction of the stator core 110. At least one seal 130 is fixedly connected to the plurality of axial projections 112, each seal 130 being embedded in the annular groove 111. The housing 120 is fixedly coupled to an outer surface of the stator core 110. Wherein the housing 120, the seal 130 and the bottom of the annular groove 111 form a spaced annular cooling channel. The above-mentioned solution can make the coolant circulate in the annular cooling channel between stator core 110 and shell 120, has reduced the possibility that the coolant exposes outside shell 120, can improve the cooling capacity of motor.

Description

Motor, power assembly and electric vehicle

Technical Field

The present utility model relates to the field of electric vehicles, and more particularly to an electric machine, a powertrain, and an electric vehicle.

Background

At present, in the running process of the motor, the stator can generate a large amount of heat to lead the motor to continuously heat up due to the iron loss generated by the stator iron core and the copper loss generated by the stator winding, and the continuously heated temperature can greatly influence the service life of an insulation system of the motor, so that the motor needs to be cooled. For example, the good heat transfer capability of the coolant may be utilized to spray the coolant onto the stator core to cool the motor. However, when the motor is cooled by spraying, the cooling liquid is easily exposed from the gaps of the motor housing, so that the cooling capacity of the motor is lowered.

Disclosure of Invention

The utility model provides a motor, a power assembly and an electric vehicle, which can improve the cooling capacity of the motor.

In a first aspect, an electric machine is provided that includes a stator core 110, a housing 120, and at least one seal 130. The outer surface of the stator core 110 includes an annular groove 111 and a plurality of axial protrusions 112, the plurality of axial protrusions 112 being arranged at intervals along the circumference of the stator core 110, the annular groove 111 being disposed along the circumference of the stator core 110. The inside of the stator core 110 includes a plurality of core cooling passages 113, and the plurality of core cooling passages 113 penetrate through an end surface of the stator core 110 and one side wall of the annular groove 111 in the axial direction of the stator core 110. At least one seal 130 is fixedly connected to the plurality of axial projections 112, each seal 130 being embedded in the annular groove 111. The housing 120 is fixedly connected to the outer surface of the stator core 110, and the housing 120, the at least one sealing member 130 and the bottom of the annular groove 111 form an annular cooling channel at intervals, and the annular cooling channel is communicated with the plurality of core cooling channels 113.

Based on the technical scheme, the sealing piece 130 embedded in the annular groove 111 can block the gap between the bottom of the annular groove 111 and the shell 120 at intervals, and the gap can be absent at other positions except the annular groove 111 at the connection position of the shell 120 and the outer surface of the stator core 110. The coolant can circulate in the annular cooling channel formed by the gaps, thereby reducing the possibility of the coolant leaking out of the housing 120 and improving the cooling capacity of the motor.

In combination with the first aspect, in certain implementations of the first aspect, one opening of each core cooling channel 113 is exposed to one end face of the stator core 110, and the other opening of each core cooling channel 113 is exposed to one side wall of the annular groove 111.

Based on this technical scheme, annular cooling channel communicates with a plurality of iron core cooling channels 113 inside stator core 110, and an opening of every iron core cooling channel 113 exposes in an terminal surface of stator core 110, and the coolant liquid can follow annular cooling channel and flow through two terminal surfaces of stator core 110 promptly, cools off the heat that stator core 110 produced, has improved motor cooling's efficiency.

In combination with the first aspect, in certain implementations of the first aspect, the plurality of core cooling channels 113 includes a plurality of sets of core cooling channels 113, and openings of each set of core cooling channels 113 exposed to one sidewall of the annular groove 111 are distributed between the two seals 130.

In combination with the first aspect, in certain implementations of the first aspect, a plurality of core cooling channels 113 are circumferentially spaced along the stator core 110, and a spacing of each core cooling channel 113 from an outer surface of the stator core 110 is less than a spacing of any core cooling channel 113 from any axial projection 112.

Based on this technical scheme, a plurality of iron core cooling channel 113 are on the basis that can be linked together with annular cooling channel, evenly set up along stator core 110 circumference, can be abundant cool off stator core, promote the cooling efficiency of motor.

In combination with the first aspect, in certain implementations of the first aspect, the stator core 110 includes a plurality of winding cooling channels 114 inside, the plurality of winding cooling channels 114 are arranged at intervals along the circumference of the stator core 110, each winding cooling channel 114 extends through two end surfaces of the stator core 110 along the axial direction of the stator core 110, and a distance between each winding cooling channel 114 and an outer surface of the stator core 110 is greater than a depth of the annular groove 111.

Based on the present solution, the inside of the stator core 110 of the motor may include not only the core cooling channels 113 near the outer surface of the stator core 110, but also the winding cooling channels 114 near the inner surface of the stator core 110. The core cooling channels 113 and the winding cooling channels 114 can sufficiently cool the stator core 110 and the stator winding, and can further improve the cooling efficiency of the motor.

In combination with the first aspect, in certain implementations of the first aspect, a spacing of the two sidewalls of the annular groove 111 is greater than a depth of the annular groove 111, the depth of the annular groove 111 being greater than or equal to a spacing of each core cooling channel 113 from an outer surface of the stator core 110.

Based on this technical scheme, can promote the area that the coolant liquid circulated through in ring channel 111 through the interval of two lateral walls that increases ring channel 111, through setting up the degree of depth of ring channel 111 for the coolant liquid can flow in iron core cooling channel from annular cooling channel, further increases the route that the coolant liquid circulated in the motor, improves the cooling efficiency of motor.

In combination with the first aspect, in certain implementations of the first aspect, a spacing of one side wall of the annular groove 111 from one end face of the stator core 110 is equal to a spacing of the other side wall of the annular groove 111 from the other end face of the stator core 110.

Based on the technical scheme, the sealing piece 130 embedded in the annular groove 111 is positioned at the middle position of the stator core 110, so that the symmetry of the motor can be improved, and the motor is more stable when the motor operates.

In combination with the first aspect, in certain implementations of the first aspect, a bottom surface of each seal 130 is in contact with a bottom portion surface of the annular groove 111, a bottom surface curvature of each seal 130 is equal to a bottom surface curvature of the annular groove 111, and two sides of each seal 130 are respectively in interference fit with two sidewalls of the annular groove 111.

Based on the technical scheme, two side faces of the sealing piece 130 are respectively in interference fit with two side walls of the annular groove 111, so that the sealing performance between the sealing plate 130 and the annular groove 111 can be improved, and the cooling capacity of the motor is improved.

With reference to the first aspect, in certain implementations of the first aspect, the portion of the housing 120 spaced from the annular groove 111 includes a coolant inlet in communication with the annular cooling channel.

Illustratively, the cooling liquid can enter the annular cooling channel from the cooling liquid inlet under a certain pressure, and flow into the core cooling channels 113 at two ends under the action of the pressure, then flow into the winding cooling channels 114 through the gaps between the sealing plates and the end faces of the stator core 110, and then flow out through an opening of the winding cooling channels 114 exposed out of the end faces, so that the cooling of the motor is realized, and the cooling efficiency of the motor is improved.

In combination with the first aspect, in certain implementations of the first aspect, the stator core 110 is a cylindrical structure, the plurality of axial protruding portions 112 includes two groups of axial protruding portions 112, the two groups of axial protruding portions 112 are respectively disposed at two ends of the cylindrical structure of the stator core 110, the two groups of axial protruding portions 112 include at least three axial protruding portions 112, and each group of axial protruding portions 112 is uniformly spaced along the circumference of the stator core 110.

Based on this technical scheme, because a plurality of axial bulge 112 are along stator core 110 axial even interval arrangement, can promote the symmetry of motor for the motor can be more stable when the operation.

In combination with the first aspect, in certain implementations of the first aspect, one axial projection 112 of one set of axial projections 112 and one axial projection 112 of another set of axial projections 112 together secure one seal 130 by one bolt member.

Based on the present technical solution, each sealing member 130 can be fixedly connected through two axial protruding portions 112 located at two ends of the annular groove 111, so that symmetry of the motor can be improved, and the motor can be more stable during operation.

In combination with the first aspect, in certain implementations of the first aspect, the housing 120 includes two end plates and side plates, the two end plates are respectively fixed to the two sets of axial protrusions 112, the side plates are fixedly connected with the outer surface of the stator core 110 and the at least one sealing member 130, and the two end plates and the side plates form a sealed cavity.

In a second aspect, there is provided a powertrain comprising the electric machine of the first aspect or various implementations of the first aspect.

In a third aspect, there is provided an electric vehicle comprising the electric machine of the first aspect or various implementations of the first aspect.

Drawings

FIG. 1 is a schematic cross-sectional view of an electric motor according to an embodiment of the present utility model;

fig. 2 is an end view schematically illustrating an electric motor according to an embodiment of the present utility model;

FIG. 3 is a three-dimensional schematic of an electric motor according to an embodiment of the present utility model;

FIG. 4 is a three-dimensional schematic of another motor according to an embodiment of the utility model;

FIG. 5 is a three-dimensional schematic of a seal according to an embodiment of the utility model;

fig. 6 is a schematic structural diagram of an electric vehicle according to an embodiment of the present utility model.

Detailed Description

The technical scheme of the utility model will be described below with reference to the accompanying drawings.

It should be noted that, in the description of the embodiments of the present utility model, unless otherwise indicated, "/" means or, for example, a/B may represent a or B; "and/or" herein is merely an association relationship describing an association object, and means that three relationships may exist, for example, a and/or B may mean: a exists alone, A and B exist together, and B exists alone. In addition, in the description of the embodiments of the present utility model, "plurality" means two or more, and "at least one" and "one or more" mean one, two or more. The singular expressions "a," "an," "the," and "such" are intended to include, for example, also "one or more" such expressions, unless the context clearly indicates to the contrary.

Reference in the specification to "one embodiment" or "some embodiments" or the like means that a particular feature, structure, or characteristic described in connection with the embodiment is included in one or more embodiments of the utility model. Thus, appearances of the phrases "in one embodiment," "in some embodiments," "in other embodiments," and the like in the specification are not necessarily all referring to the same embodiment, but mean "one or more but not all embodiments" unless expressly specified otherwise. The terms "comprising," "including," "having," and variations thereof mean "including but not limited to," unless expressly specified otherwise.

In the description of embodiments of the present utility model, the terms "upper," "lower," "left," "right," "vertical," "horizontal," and the like are used for defining an orientation or position relative to the orientation or position in which components are schematically illustrated in the drawings, and it should be understood that these directional terms are relative terms used for describing and clarifying the description relative to each other, rather than for indicating or implying that the apparatus or component being referred to must have a particular orientation, or be constructed and operated in a particular orientation, which may vary accordingly with respect to the orientation in which components are being disposed in the drawings and therefore should not be construed as limiting the present utility model.

In the embodiments of the present utility model, the same reference numerals are used to denote the same components or the same parts. In addition, the various components in the drawings are not to scale, and the dimensions and sizes of the components shown in the drawings are merely illustrative and should not be construed as limiting the utility model.

For ease of understanding, a motor to which embodiments of the present utility model may be applied will be described first. The motor mainly comprises a stator, a rotor and a shell, wherein the stator can be positioned in the shell, and the rotor can be positioned in the stator. Wherein the stator may include a stator core and a stator winding. The stator core can be formed by punching and laminating silicon steel sheets and is fixed in the shell. The inner surface of the stator core can be provided with evenly distributed stator slots, and stator windings are respectively arranged in each stator slot according to a certain rule. After the stator winding of the motor is electrified, a rotating magnetic field can be generated, and the rotating magnetic field acts on a rotor inside a stator core to form magneto-electric power rotating torque, so that the motor is rotated. At present, motors can be divided into various types based on structures and working principles, such as direct current motors, alternating current motors, synchronous motors, asynchronous motors, permanent magnet motors, winding motors and the like, and the embodiment of the utility model does not particularly limit the types of motors.

In the running process of the motor, a large amount of heat is generated due to the iron loss generated by the stator iron core and the copper loss generated by the stator winding, and the motor needs to be cooled. For example, means for spraying a cooling liquid may be provided between the housing and the stator, the cooling liquid being sprayed on the stator for cooling. However, there is a large space between the housing and the stator, for example, for a motor in which the stator is fixed to the housing by bolts, there is a gap in the housing bolt position. The cooling liquid easily flows out from the gap of the motor housing, so that the cooling capacity of the motor is reduced.

The utility model provides a motor, a power assembly and an electric vehicle, which can improve the cooling capacity of the motor. The motor according to the present utility model will be described with reference to fig. 1 to 5.

Fig. 1 is a schematic cross-sectional view of an electric motor according to an embodiment of the present utility model, and fig. 2 is an end-face schematic view of an electric motor according to an embodiment of the present utility model. The motor includes a stator core 110, a housing 120, and at least one seal 130.

Wherein the outer surface of the stator core 110 includes an annular groove 111 and a plurality of axial projections 112. The annular groove 111 is provided along the circumferential direction of the stator core 110. The plurality of axial protrusions 112 are arranged at intervals along the circumferential direction of the stator core 110. The stator core 110 includes a plurality of core cooling passages 113 therein. A plurality of core cooling passages 113 axially penetrate through the end face of the stator core 110 and the groove wall of the annular groove 111 along the stator core 110.

At least one seal 130 is fixedly coupled to each of the plurality of axial projections 112. Each seal 130 is embedded in the annular groove 111.

The housing 120 is fixedly coupled to an outer surface of the stator core 110. The housing 120, at least one seal 130, and the bottom of the annular groove 111 form a spaced annular cooling channel. The annular cooling channels communicate with a plurality of core cooling channels 113. According to the technical scheme provided by the embodiment of the utility model, the sealing piece 130 embedded in the annular groove 111 can block the gap between the bottom of the annular groove 111 and the shell 120 at intervals, and the gap can be absent at other positions except the annular groove 111 at the joint of the shell 120 and the outer surface of the stator core 110. The coolant can circulate in the annular cooling channel formed by the gaps, thereby reducing the possibility of the coolant leaking out of the housing 120 and improving the cooling capacity of the motor.

In addition, the annular cooling passage communicates with a plurality of core cooling passages 113 inside the stator core 110, and one opening of each core cooling passage 113 is exposed to one end face of the stator core 110. The cooling liquid can flow through the two end surfaces of the stator core 110 from the annular cooling channel to cool the heat generated by the stator core 110, thereby improving the cooling efficiency of the motor.

The number of axial projections 112, seals 130, core cooling channels 113 in the stator core 110 of the motor provided in the examples of the utility model may include various combinations.

For example, the number of the axial protrusions 112 is 2×n, the number of the sealing members 130 is N, the number of the core cooling passages 113 is n×m, each sealing member 130 may be fixedly connected with two axial protrusions 112, and M core cooling passages 113 may be distributed between every two sealing members 130, where N and M are positive integers. To facilitate understanding of the embodiments of the present utility model, fig. 1 shows only two of the axial protrusions 112, one seal 130, and one core cooling channel 113 included in the stator core 110 in section. Fig. 2 shows only one of the axial projections 112 and six core cooling passages 113 included in the stator core 110 from the end face.

It should be noted that, the stator core 110 and the housing 120 may each have a cylindrical shape (the cylindrical shape may also be referred to as a circular cylinder shape), in which a small cylinder is hollowed out in the middle of a large cylinder, and axes of the large cylinder and the small cylinder are coincident. The stator core 110 may be placed at a position hollowed out in the middle of the housing 120, and the rotor may be placed at a position hollowed out in the middle of the stator core 110. In the embodiment of the present utility model, the term "end face of the stator core 110" may refer to annular end faces of both ends of the cylindrical stator core 110. The term "outer surface of the stator core 110" may refer to a side of a large cylinder of the cylindrical stator core 110. The term "inner surface of the stator core 110" may refer to the side of the small cylinder where the cylindrical stator core 110 is hollowed out. The term "circumferential direction of the stator core 110" may be a circumferential direction of a cylindrical structure of the designated stator core 110, which is perpendicular to both the axis and the section radius. The term "axial direction of the stator core 110" may refer to a direction parallel to the axis of the cylindrical stator core 110. To facilitate an understanding of the embodiments of the present utility model, fig. 2 illustrates a portion of a scalloped region of one annular end surface of stator core 110.

It should be noted that, although the drawings in the embodiments of the present utility model are not shown, the motor in the embodiments of the present utility model may further include other components such as a stator winding, a rotor, end covers, and a base, for example, two end covers may be disposed opposite to each other at two ends of the housing 120, and the center positions of the two end covers may be used to fix a rotation axis of the rotor, where the rotation axis of the rotor coincides with the axis of the stator core 110, and the rotor is disposed inside the housing 120 and rotates along the rotation axis. The stator core 110, the housing 120, and the seal 130 of the motor are described below, respectively.

The stator core outer surface includes a plurality of axial protrusions 112 and annular grooves 111, the plurality of axial protrusions 112 may be arranged at intervals along the stator core 110 circumference, and the annular grooves 111 may be disposed along the stator core 110 circumference. For example, the stator core 110 may be formed of a plurality of large-diameter silicon steel sheets with protrusions and a plurality of small-diameter silicon steel sheets aligned and laminated. The protrusions of the plurality of large-diameter silicon steel sheets form the axial protrusions 112 of the stator core 110, and the plurality of small-diameter silicon steel sheets are laminated to form the annular groove 111. The depth of the annular groove 111 may be the difference in radius of the two silicon steel sheets. It should be noted that the above is merely an example, and the present utility model is not limited in any way to the preparation of the axial projection and the annular groove.

The plurality of axial projections 112 may be arranged in a variety of ways. For example, the plurality of axial protrusions 112 may include two sets of axial protrusions 112, the two sets of axial protrusions 112 are disposed at two ends of the cylindrical structure of the stator core 110, respectively, the two sets of axial protrusions 112 include at least three axial protrusions 112, respectively, and each set of axial protrusions 112 is uniformly spaced apart in the circumferential direction. One end of each axial protrusion 112 may be located at one end face of the stator core 110, and the other end of each axial protrusion 112 may be flush with a side wall of the annular groove 111 adjacent to the end face. For convenience of description, two end surfaces of the stator core 110 are referred to as a first end surface and a second end surface, respectively, and a side wall of the annular groove 111 near the first end surface is referred to as a first side wall, and a side wall of the annular groove 111 near the second end surface is referred to as a second side wall. The axial protruding portions 112 between the first end face and the first side wall are one set of axial protruding portions 112, the axial protruding portions 112 between the second end face and the second side wall are another set of axial protruding portions 112, and each set of axial protruding portions 112 may be uniformly arranged at intervals along the circumferential direction of the stator core 110. Accordingly, since the plurality of axial protrusions 112 are uniformly spaced apart along the axial direction of the stator core 110, the symmetry of the motor can be improved, so that the motor can be more stable in operation.

It will be appreciated that an axial projection 112 is shown in fig. 1 between a first end face and the first side wall, and an axial projection 112 is shown between a second end face and the second side wall. Fig. 2 shows a set of axial projections 112 between the first end face and the first side wall (or the second end face and the second side wall), and fig. 2 exemplifies a set of 6 axial projections 112 arranged at regular intervals along the circumferential direction of the stator core 110.

Each axial projection 112 may include a bolting hole inside, which penetrates both ends of the axial projection 112.

In some embodiments, the plurality of axial projections 112 may include two sets of axial projections, with the bolting holes of the two sets of axial projections 112 being disposed in axial alignment, respectively. Illustratively, two sets of axial projections 112 are in one-to-one correspondence, and the bolting holes of each two corresponding axial projections 112 are axially aligned along the stator core 110, and one axial bolt can penetrate the bolting holes of the two corresponding axial projections 112. In addition, the two ends of the casing 120 may further include end caps, and the axial bolts may penetrate through the end caps at the two ends of the casing 120, and the stator core 110 is firmly fixed inside the casing 120 through the axial nuts and the axial bolts, so that the motor is more stable during operation.

It will be appreciated that the seal 130 within the annular groove 113 may block the gap between the two axial projections 112 and that the coolant may circulate in the spaced annular cooling passages formed by the stator core 110, the housing 120 and the seal 130. Accordingly, the possibility of the coolant flowing out of the clearance formed in the casing from the axial bolt can be reduced, and the cooling capacity of the motor can be improved.

The spacing and depth of the two side walls of the annular groove 111 may be designed based on the size of the motor. Illustratively, the distance between the two sidewalls of the annular groove 111 may be greater than the depth of the annular groove 111, and the depth of the annular groove 111 may be greater than or equal to the distance between each core cooling channel 113 and the outer surface of the stator core 110. Therefore, the area through which the cooling liquid flows in the annular groove 111 can be increased by increasing the distance between the two side walls of the annular groove 111, and the cooling liquid can flow into the iron core cooling channel from the annular cooling channel by setting the depth of the annular groove 111, so that the flow path of the cooling liquid in the motor is further increased, and the cooling efficiency of the motor is improved.

The position of the annular groove 111 on the stator core 110 may be designed based on the structure of the motor. Illustratively, the spacing of one side wall of the annular groove 111 from one end face of the stator core 110 is equal to the spacing of the other side wall of the annular groove 111 from the other end face of the stator core 110. That is, the spacing between the first end face and the first side wall is equal to the spacing between the second end face and the second side wall. Accordingly, the two sets of axial protrusions 112 are symmetrical about the annular groove 111, and the sealing member 130 embedded in the annular groove 111 is located at the middle position of the stator core 110, further improving the symmetry of the motor, so that the motor is more stable when the motor operates.

The inside of the stator core may include a plurality of core cooling passages 113, and the plurality of core cooling passages 113 penetrate through an end surface of the stator core 110 and a sidewall of the annular groove 111 in the axial direction of the stator core 110. For example, if the stator core 110 is formed by stacking a plurality of large-diameter silicon steel sheets with protrusions and a plurality of small-diameter silicon steel sheets in alignment, a plurality of through holes may be provided in each of the large-diameter silicon steel sheets, and the distance between the through holes and the axis of the stator core 110 is greater than or equal to the radius of the small-diameter silicon steel sheets, so that the plurality of large-diameter silicon steel sheets are stacked in alignment such that the plurality of through holes form a plurality of core cooling passages 113.

One opening of each core cooling channel 113 may be exposed to one end surface of the stator core 110, and the other opening of each core cooling channel 113 may be exposed to the other end surface of the stator core 110.

Illustratively, two openings of a portion of the core cooling channels 113 are exposed to the first end surface of the stator core 110 and the first side wall of the annular groove 111, respectively, and two openings of another portion of the core cooling channels 113 are exposed to the second end surface of the stator core 110 and the second side wall of the annular groove 111, respectively. Therefore, the cooling liquid enters the annular cooling channels and can flow to the core cooling channels 113 at the two ends to cool the heat generated by the stator core 110, so that the cooling efficiency of the motor is improved. The locations of the plurality of core cooling passages 113 on the stator core may be designed based on the structure of the motor. Illustratively, a plurality of core cooling passages 113 are circumferentially spaced along the stator core 110, each core cooling passage 113 being spaced from an outer surface of the stator core 110 by a distance less than the distance between any core cooling passage 113 and any axial projection 112. That is, the distance between the core cooling channels 113 and the axis of the stator core 110 is smaller than the radius of the large cylinder of the stator core 110, and the opening of the core cooling channels 113 exposed to the end surface of the stator core 110 is located in the annular area of the end surface of the stator core 110, instead of the area of the axial protrusion 112. The plurality of core cooling passages 113 may include a plurality of sets of core cooling passages 113, with the openings of each set of core cooling passages 113 exposed to the annular groove 111 being distributed between the two seals 130. Accordingly, the plurality of core cooling passages 113 are uniformly arranged along the circumferential direction of the stator core 110 on the basis that the plurality of core cooling passages can be communicated with the annular cooling passages, so that the stator core can be sufficiently cooled, and the cooling efficiency of the motor is improved.

In some embodiments, the inside of the stator core 110 may further include a plurality of winding cooling channels 114, the plurality of winding cooling channels 114 being arranged at intervals along the circumference of the stator core 110, each winding cooling channel 114 penetrating through both end surfaces of the stator core 110 along the axial direction of the stator core 110, and each winding cooling channel 114 being spaced from the outer surface of the stator core 110 by a distance greater than the depth of the annular groove 111.

It will be appreciated that the two openings of each winding cooling channel 114 are located at the two end faces of the stator core 110, respectively, there are no openings exposed to the side walls of the annular groove 111, and the spacing between each winding cooling channel 114 and the outer surface of the stator core 110 may be greater than the spacing between each core cooling channel 113 and the outer surface of the stator core 110, and the annular cooling channels are not in direct communication with the winding cooling channels 114. Thus, the interior of the stator core 110 of the motor may include not only the core cooling channels 113 near the outer surface of the stator core 110, but also the winding cooling channels 114 near the inner surface of the stator core 110. The core cooling channels 113 and the winding cooling channels 114 can sufficiently cool the stator core 110 and the stator winding, and can further improve the cooling efficiency of the motor.

The location of the winding cooling passageways 114 inside the stator core 110 may be designed based on the structure of the motor. Illustratively, the inner surface of the stator core 110 includes a plurality of stator slots penetrating through both end surfaces of the stator core 110 in the axial direction of the stator core 110, the plurality of stator slots being uniformly arranged in the circumferential direction of the stator core 110, and a distance between each winding cooling passage 114 and the inner surface of the stator core 110 is greater than a distance between a bottom of each stator slot and the inner surface of the stator core 110. Accordingly, the winding cooling channels 114 are arranged on the outer sides of the stator slots, so that the influence of the winding cooling channels 114 on the stator teeth and the magnetic circuit of the stator slots can be reduced, and the operation reliability of the motor can be improved.

The number of winding cooling passages 114 may be designed based on the configuration of the motor. The number of winding cooling channels 114 may be the same as the number of stator slots, or may be an integer multiple of the number of stator slots, for example. That is, one or more winding cooling passages 114 may be provided at the outer side of each stator slot, so that the stator winding can be sufficiently cooled, and the cooling efficiency of the motor can be improved.

In some embodiments, an opening of each winding cooling channel 114 exposed at one end face communicates with an opening of the core cooling channel 113 exposed at that end face.

Illustratively, the two end surfaces of the stator core 110 include two sealing plates, respectively, e.g., a first end surface of the stator core 110 includes a first sealing plate and a second end surface of the stator core 110 includes a second sealing plate. The first sealing plate covers the opening of the core cooling passage 113 exposed to the first end face, and a portion of the winding cooling passage 114 is exposed to the opening of the first end face. The second sealing plate covers the opening of the core cooling passage 113 exposed to the second end face, and the other part of the winding cooling passage 114 is exposed to the opening of the second end face. The core cooling passages 113 and the winding cooling passages 114 may communicate with a gap formed at the end face of the stator core 110 through a sealing plate.

It will be appreciated that one opening of each winding cooling passage 114 is covered by a sealing plate and the other opening is not covered by a sealing plate. For example, the plurality of winding cooling passages 114 may include two sets of winding cooling passages. Wherein the openings of the first set of winding cooling passageways 114 exposed at the first end face are covered by a first sealing plate and the openings exposed at the second end face are uncovered by a second sealing plate. The openings of the second set of winding cooling passages 114 exposed at the first end face are not covered by the first seal plate, and the openings exposed at the second end face are covered by the second seal plate. Thus, the opening of the core cooling passage 113 exposed to the first end face and the opening of the first group of winding cooling passages 114 exposed to the first end face can communicate through the gap formed by the first end face and the first sealing plate. Part of the cooling liquid flows into the first group of winding cooling channels 114 from the iron core cooling channels 113, flows out from the openings of the first group of winding cooling channels 114 exposed out of the second end face, can be sprayed on the end windings of the stator winding, cools the end windings, and improves the cooling efficiency of the motor. Similarly, the opening of the core cooling passage 113 exposed to the second end face and the opening of the second group of winding cooling passages 114 exposed to the second end face may communicate through a gap formed by the second end face and the second sealing plate. A part of the cooling liquid flows into the second group of winding cooling channels 114 from the iron core cooling channels 113, flows out from the opening of the second group of winding cooling channels 114 exposed out of the first end face, cools the end winding, and further improves the cooling efficiency of the motor.

In the example of 6 core cooling channels and 3 winding cooling channels shown in fig. 2, the black filled and drawn openings indicate that they are covered with the sealing plate, and the white filled and drawn openings indicate that they are not covered with the sealing plate.

A plurality of seals 130 of the motor may be fixedly connected to the plurality of axial protrusions 112, respectively, each seal 130 being embedded in the annular groove 111. Illustratively, each seal may be fixedly connected by one axial projection 112 of one set of axial projections 112 and one axial projection 112 of another set of axial projections 112. That is, each sealing member 130 may be fixedly coupled by the two axial protrusions 112 at both ends of the annular groove 111, so that the symmetry of the motor can be improved, and the motor can be more stable in operation.

The axial projection 112 and the seal 130 may be fixedly coupled in a variety of ways. For example, two axial projections 112 may cooperate to secure a seal 130 via a bolt member. For example, each seal 130 may include a bolting hole, the bolting holes of each two corresponding axial projections 112 being axially aligned along the stator core 110, the bolting holes of the seal 130 intermediate each two axial projections 112 being aligned with the bolting holes of the axial projections 112. An axial bolt can be inserted through the bolt coupling holes of the two corresponding axial protrusions 112 and the bolt coupling holes of the sealing member 130, respectively, so that the sealing member 130 is fixed in the annular groove 111. Thus, fixing one seal 130 by the two axial protrusions 112 improves the stability of the seal 130 in the annular groove 111, reduces the possibility of leakage of the cooling liquid out of the housing 120, and improves the cooling capacity of the motor.

The shape and configuration of the seal 130 may be based on the structural design of the motor. Illustratively, the seal 130 has a projection with respect to the outside of the annular groove 111, the projection having a bolting hole therein, the spacing between the bolting hole and the bottom of the annular groove 111 being greater than the depth of the annular groove 111.

Still further exemplary, the bottom surface of each seal 130 is in contact with the bottom portion surface of the annular groove 111, and the curvature of the bottom surface of each seal 130 is equal to the curvature of the bottom surface of the annular groove 111. For example, the bottom of each seal 130 may be an arcuate plate having the same width as the annular groove 111, wherein the width of the annular groove 111 is the distance between the two sidewalls of the annular groove 111. The thickness of the arcuate plate may be greater than or equal to the depth of the annular groove 111 and the arc of the arcuate plate may be equal to the arc of the bottom surface of the annular groove 111. Accordingly, the arc-shaped plate of the sealing member 130 can be tightly attached in the annular groove 111, the sealing performance between the sealing plate 130 and the annular groove 111 is improved, the possibility that the cooling liquid leaks out of the shell 120 is reduced, and the cooling capacity of the motor is improved.

In some embodiments, both sides of each seal 130 are interference fit with both sidewalls of the annular groove 111, respectively. Wherein, the interference fit means that the size of the connection of the sealing member 130 may be larger than the size of the connection of the annular groove 111, for example, the width of the arcuate plate of the sealing member 130 may be larger than the width of the annular groove 111. The seal 130 may be assembled into the annular groove 111 using a compression or expansion and contraction process. Thereby further improving the sealability between the sealing plate 130 and the annular groove 111 and improving the cooling capacity of the motor.

The housing 120 may include two end plates and side plates, the two end plates are respectively fixed to the two sets of axial protrusions 112, the side plates are fixedly connected with the outer surface of the stator core 110 and the sealing member 130, and the two end plates and the side plates form a sealing cavity.

In some embodiments, the side plates of the housing 120 are interference fit with the stator core 110. The inner diameter of the side plate may be larger than the outer diameter of the stator core 110, and the stator core 110 may be assembled into the housing 120 using a pressurizing or thermal expansion and contraction process. Therefore, the tightness between the housing 120 and the stator core 110 can be improved, the possibility that the cooling liquid leaks out of the housing 120 is reduced, and the cooling capacity of the motor is improved.

The seal 130 and the annular groove 111 may be connected to the stator core 110 and the housing 120 by other means such as a transition fit, which is not particularly limited in the present utility model.

In some embodiments, the portion of the housing 120 spaced from the annular groove 111 includes a coolant inlet in communication with the annular cooling passage. The cooling fluid may be cooling oil or other cooling medium that does not affect the electromagnetic properties of the motor.

Illustratively, the cooling liquid can enter the annular cooling channel from the cooling liquid inlet under a certain pressure, and flow into the core cooling channels 113 at two ends under the action of the pressure, then flow into the winding cooling channels 114 through the gaps between the sealing plates and the end faces of the stator core 110, and then flow out through an opening of the winding cooling channels 114 exposed out of the end faces, so that the cooling of the motor is realized, and the cooling efficiency of the motor is improved.

The housing 120 may further include a coolant outlet, so that the coolant may flow out from the coolant outlet, and the location of the coolant outlet is not particularly limited in the present utility model.

In order to facilitate understanding of the embodiments of the present utility model, fig. 3 to 5 respectively show three-dimensional schematic diagrams of respective parts of the motor according to the embodiments of the present utility model.

Referring to fig. 3, fig. 3 shows an axial protrusion 112 of the stator core 110, the axial protrusion 112 being provided with a bolt connection hole. The seal 130 is embedded in the annular groove 111 between the two axial projections 112. An axial bolt may extend through the bolt connection holes in the axial projection 112 and the seal 130, respectively. Referring to fig. 4, fig. 4 shows a partial core cooling channel 113 and a partial winding cooling channel 114 inside one stator core 110. Referring to fig. 5, fig. 5 shows a three-dimensional perspective view of a seal 130 with an arcuate plate at the bottom for engagement in annular groove 111. A bolting hole may be provided in the upper intermediate position of the seal 130, which may be used for fixation between the two axial projections 112.

Fig. 3 to 5 are only schematic explanatory views for facilitating understanding of the embodiment of the present utility model, and do not limit the present utility model in any way.

The embodiment of the utility model also provides a power assembly, which comprises the motor described in the embodiment. Optionally, the power assembly provided by the embodiment of the utility model can be applied to electric vehicles, and particularly can be applied to electric vehicles, such as pure electric vehicles, extended range electric vehicles, hybrid electric vehicles, fuel cell vehicles, new energy vehicles and the like. Alternatively, the present utility model may be applied to a battery management device, a power conversion device, a motor drive device, or the like, and the present utility model is not particularly limited thereto.

The embodiment of the utility model also provides an electric vehicle, such as a pure electric vehicle, an extended range electric vehicle, a hybrid electric vehicle, a fuel cell vehicle, a new energy vehicle and the like, which comprises the motor described in the embodiment, and the motor can be used for providing driving force for the electric vehicle.

Fig. 6 is a schematic structural diagram of an electric vehicle provided by an embodiment of the present utility model. The electric vehicle 600 may include the motor 200 described above. Illustratively, the electric vehicle 600 may include an on-road vehicle, a water vehicle, an air vehicle, an industrial device, an agricultural device, an entertainment device, or the like. For example, the vehicle is a vehicle in a broad concept, and may be a vehicle (such as a commercial vehicle, a passenger car, a motorcycle, an aerocar, a train, etc.), an industrial vehicle (such as a forklift, a trailer, a tractor, etc.), an engineering vehicle (such as an excavator, a earth mover, a crane, etc.), an agricultural device (such as a mower, a harvester, etc.), an amusement device, a toy vehicle, etc., and the type of the vehicle is not particularly limited in the embodiments of the present utility model.

The embodiment of the utility model also provides a device which comprises the motor described in the embodiment. The motor may be used as a motor in the device to drive the device to move. The device can also be a power generation device, such as wind power, water power and the like, and the motor can be used as a generator to generate electric energy in the power generation device. The present utility model is not particularly limited thereto.

The foregoing is merely illustrative of the present utility model, and the present utility model is not limited thereto, and any person skilled in the art will readily recognize that variations or substitutions are within the scope of the present utility model. Therefore, the protection scope of the present utility model shall be subject to the protection scope of the claims.

Claims (14)

1. An electric machine, comprising:

the stator core (110), the stator core (110) surface includes ring channel (111) and a plurality of axial bulge (112), a plurality of axial bulge (112) are followed stator core (110) circumference interval arrangement, ring channel (111) are followed stator core (110) circumference setting, stator core (110) inside includes a plurality of iron core cooling channel (113), a plurality of iron core cooling channel (113) are followed stator core (110) axial run through terminal surface and the one lateral wall of ring channel (111) of stator core (110);

-at least one seal (130), said at least one seal (130) being fixedly connected to said plurality of axial projections (112), each said seal (130) being embedded in said annular groove (111);

the shell (120), shell (120) with stator core (110) surface fixed connection, shell (120), at least one sealing member (130) with the bottom of ring channel (111) forms the annular cooling channel of interval, annular cooling channel with a plurality of iron core cooling channel (113) are linked together.

2. The electric machine according to claim 1, wherein one opening of each of the core cooling passages (113) is exposed to one end face of the stator core (110), and the other opening of each of the core cooling passages (113) is exposed to one side wall of the annular groove (111).

3. The electric machine according to claim 2, characterized in that the plurality of core cooling channels (113) comprises a plurality of groups of core cooling channels (113), the openings of each group of core cooling channels (113) exposed at one side wall of the annular groove (111) being distributed between two of the seals (130).

4. A machine according to any one of claims 1 to 3, wherein the plurality of core cooling passages (113) are arranged at intervals in the circumferential direction of the stator core (110), and a distance between each core cooling passage (113) and an outer surface of the stator core (110) is smaller than a distance between any one of the core cooling passages (113) and any one of the axial protrusions (112).

5. A machine according to any one of claims 1 to 3, characterized in that the stator core (110) internally comprises a plurality of winding cooling channels (114), the plurality of winding cooling channels (114) being arranged at intervals along the circumference of the stator core (110), each winding cooling channel (114) penetrating through both end faces of the stator core (110) along the axial direction of the stator core (110), each winding cooling channel (114) being spaced from the outer surface of the stator core (110) by a distance greater than the depth of the annular groove (111).

6. A machine according to any one of claims 1 to 3, characterized in that the distance between the two side walls of the annular groove (111) is greater than the depth of the annular groove (111), the depth of the annular groove (111) being greater than or equal to the distance between each of the core cooling channels (113) and the outer surface of the stator core (110).

7. A motor according to any one of claims 1 to 3, characterized in that a distance between one side wall of the annular groove (111) and one end face of the stator core (110) is equal to a distance between the other side wall of the annular groove (111) and the other end face of the stator core (110).

8. A machine according to any one of claims 1 to 3, wherein the bottom surface of each seal (130) is in contact with the bottom part surface of the annular groove (111), the bottom surface curvature of each seal (130) being equal to the bottom surface curvature of the annular groove (111), the two sides of each seal (130) being in interference fit with the two side walls of the annular groove (111), respectively.

9. A machine according to any one of claims 1 to 3, characterized in that the portion of the housing (120) spaced from the annular groove (111) comprises a coolant inlet communicating with the annular cooling channel.

10. A machine according to any one of claims 1 to 3, wherein the stator core (110) is of a cylindrical structure, the plurality of axial projections (112) includes two sets of axial projections (112), the two sets of axial projections (112) are respectively disposed at both ends of the cylindrical structure of the stator core (110), the two sets of axial projections (112) include at least three axial projections (112), respectively, and each set of axial projections (112) is arranged at regular intervals in the circumferential direction of the stator core (110).

11. The electric machine according to claim 10, characterized in that one axial projection (112) of one set of said axial projections (112) and one axial projection (112) of the other set of said axial projections (112) are jointly secured one of said sealing elements (130) by means of one bolt element.

12. The electric machine of claim 10, wherein the housing (120) comprises two end plates and side plates, the two end plates being fixed to the two sets of axial projections (112) respectively, the side plates being fixedly connected to the outer surface of the stator core (110) and the at least one seal (130), the two end plates and the side plates forming a sealed cavity.

13. A powertrain comprising an electric machine as claimed in any one of claims 1 to 12.

14. An electric vehicle comprising an electric machine as claimed in any one of claims 1 to 12.