Motor assembly

Abstract

The invention relates to a motor assembly. The motor assembly comprises a stator iron core, a coil winding, a first sealing cover and an outgoing line, the coil winding is wound on the stator iron core and protrudes out of the two axial ends of the stator iron core in the axial direction, and the first sealing cover is installed at one of the two axial ends of the stator iron core so that the first sealing cover and the stator iron core jointly define a sealing cavity for packaging the coil winding; the outgoing line is connected with the coil winding, and the first sealing cover comprises a cooling liquid outlet which penetrates through the first sealing cover to enable cooling liquid to flow out of the sealing cavity. The outgoing line is led out of the sealing cavity through the cooling liquid outlet. According to the motor assembly, the outgoing line is convenient to install.

Description

Technical Field

[0001] The present invention relates to the technical field of electric motors, and in particular to an improved electric motor assembly. Background Art

[0002] With the development of new energy technologies, motors are increasingly used as drive devices. For example, in new energy vehicles, motors are an important source of power to drive the vehicle. The motor includes a stator part and a rotor part, wherein the rotor part can rotate relative to the stator part under the action of electromagnetic force, thereby generating kinetic energy. During the operation of the motor, the current in the coil winding will cause the motor components to generate significant heat, and cooling measures are required to transfer and dissipate the heat to prevent excessive temperatures from damaging the motor components. A commonly used cooling measure is to fill the motor housing with liquids such as engine oil as a coolant, and the motor components (stator and rotor, etc.) encapsulated in the housing are immersed in the coolant. The coolant circulating inside the motor carries the heat generated by the motor components away from the motor.

[0003] However, the coil winding in the motor has lead wires for connecting to the electronic control unit, etc. These lead wires need to be led out from the axial end of the motor stator and pass through the sealing cover installed at the end of the stator core. When the lead wire passes through the sealing cover, it needs to be sealed relative to the sealing cover to prevent leakage of coolant. As can be seen in patent document CN 114301236 A, etc., the sealing method between the lead wire and the sealing cover in the prior art requires the lead wire to be fixed relative to the sealing cover, which is easy to interfere with the flexible connection between the lead wire and the electronic control unit, and has high cost and low reliability. At the same time, the complex sealing structure will also increase the axial size of the motor structure. Summary of the invention

[0004] Therefore, the technical problem to be solved by the present invention is to provide a motor component that is easy to install lead wires.

[0005] The above technical problems are solved by a motor component according to the present invention. The motor component includes a stator core, a coil winding, a first sealing cover and a lead wire. The coil winding is wound on the stator core and protrudes axially from the two axial ends of the stator core. The first sealing cover is installed at one of the two axial ends of the stator core to define a sealed cavity for encapsulating the coil winding together with the stator core. The lead wire is connected to the coil winding, and the first sealing cover includes a coolant outlet that passes through the first sealing cover to allow the coolant to flow out of the sealed cavity. The lead wire is led out of the sealed cavity via the coolant outlet. Since the coolant outlet on the sealing cover is used as the lead-out channel of the lead wire, neither sealing nor connection and fixing are required between the lead wire and the sealing cover. This simplifies the installation process of the lead wire and the structure of the sealing cover, and reduces the cost of production and assembly.

[0006] According to a preferred embodiment of the present invention, the first sealing cover may include an outer side wall located radially outside the coil winding and an end wall located axially outside the coil winding, and the coolant outlet penetrates the outer side wall so that the lead wire passes through the outer side wall and leads out of the sealed cavity radially outward. The lead wire is led out via the outer side wall, so the axial dimension of the motor assembly is not increased.

[0007] According to another preferred embodiment of the present invention, the lead wire may include a first section and a second section, wherein the first section extends from the coil winding toward the end wall, and the second section extends from the end of the first section toward the end wall toward the radial outside and leads out of the sealed cavity through the coolant outlet. The two sections of the lead wire may be formed by bending the lead wire.

[0008] According to another preferred embodiment of the present invention, the coolant outlet can extend from the end wall to the outer side wall. This means that the coolant outlet penetrates both the outer side wall in the radial direction and the end wall in the axial direction. In this case, the extension line of the first section can extend through the portion of the coolant outlet located in the end wall. This design is conducive to the installation of the sealing cover. Before installing the sealing cover, the lead wire can be made to extend roughly along the axis, and this lead wire can extend from the portion of the coolant outlet located in the end wall when the sealing cover is installed; after the sealing cover is installed on the stator core, the lead wire can be bent to lead it out of the sealing cavity radially outward.

[0009] According to another preferred embodiment of the present invention, the coolant outlet can extend axially in the outer side wall to the edge of the stator core that penetrates the outer side wall. The end of this coolant outlet facing the stator core is formed as an open end, which allows the lead wire that has been bent in advance to enter the coolant outlet through the open end when the sealing cover is installed. In this case, the end wall can include a main body area and a protrusion area that is offset relative to the main body area in a direction away from the stator core, the protrusion area corresponds to the circumferential position of the coolant outlet, and the coolant outlet extends axially across the main body area. This increases the axial size of the coolant outlet to accommodate the axial position of the lead wire.

[0010] According to another preferred embodiment of the present invention, the motor assembly may further include a second sealing cover, which is installed at the other of the two axial ends of the stator core to define another sealed cavity for encapsulating the coil winding together with the stator core, and the other sealed cavity is interconnected with the sealed cavity via the inside of the stator core, and the second sealing cover includes a coolant inlet that passes through the second sealing cover to allow the coolant to flow into the other sealed cavity, and the central axis of the stator core is used to be arranged in a horizontal direction, so that the coolant inlet and the coolant outlet are distributed on opposite sides of the horizontal plane passing through the central axis. In the installed state of the motor assembly, the central axis of the stator core is usually arranged horizontally. The coolant inlet and the coolant outlet are distributed in opposite directions with respect to the horizontal plane where the central axis is located, so that the coolant can better fill the space inside the entire stator core.

[0011] According to another preferred embodiment of the present invention, the motor assembly may include a plurality of lead wires. In this case, each of the plurality of lead wires may be led out of the sealed cavity via a corresponding independent coolant outlet; or, the plurality of lead wires may be led out of the sealed cavity via a common coolant outlet. This allows the number and distribution of the coolant outlets to be flexibly adjusted according to the distribution of the lead wires. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] The present invention is further described below in conjunction with the accompanying drawings. The same reference numerals in the drawings represent elements with the same functions.

[0013] Figure 1 A perspective view showing a motor assembly according to an exemplary embodiment of the present invention;

[0014] Figure 2 Show Figure 1 A perspective view of a sealing cover of the motor assembly shown;

[0015] Figure 3 a cross-sectional view showing a motor assembly according to another exemplary embodiment of the present invention; and

[0016] Figure 4 Show Figure 3 A perspective view of the sealing cover of the motor assembly is shown. DETAILED DESCRIPTION

[0017] The following detailed description and drawings are used to illustrate the principle of the present invention. The present invention is not limited to the preferred embodiments described. The protection scope of the present invention is defined by the claims.

[0018] According to an embodiment of the present invention, a motor assembly is provided. The motor assembly may be, for example, a drive motor for driving a motor vehicle or a motor for providing kinetic energy to other devices. Figure 1 and Figure 3 As shown, the motor assembly mainly includes a stator part, a rotor 4 and a housing 5. The stator part and the rotor 4 are installed inside the housing 5. The rotor 4 is coaxially installed on the radial inner side of the stator part and can rotate relative to the stator part around the central axis under the action of electromagnetic force. The stator part is fixed relative to the housing 5.

[0019] like Figure 1 and Figure 3 As shown, the stator part mainly includes a stator core 1, a coil winding 2, two sealing covers and one or more lead wires 6. The stator core 1 is a cylindrical structure formed around the central axis and has an axially through-hole central cavity for mounting the rotor 4. The stator core 1 is formed with a plurality of through holes that penetrate in the axial direction, and these through holes are distributed at intervals in the circumferential direction, so as to form a yoke between adjacent through holes. The coils of the coil winding 2 pass through these through holes and are wound on the yoke of the stator core 1. The coil winding 2 wound on the stator core 1 protrudes axially from the axial ends of the stator core 1.

[0020] The two sealing covers can be respectively referred to as the first sealing cover 31 and the second sealing cover 32, which are respectively installed at the axial ends of the stator core 1 to encapsulate the coil winding 2. Each sealing cover is sealed with the corresponding axial end face of the stator core 1, and a corresponding sealed cavity is formed between the sealing cover and the axial end face of the stator core 1, that is, the sealed cavity C1 between the first sealing cover 31 and the stator core 1 and the sealed cavity C2 between the second sealing cover 32 and the stator core 1. The two sealed cavities are connected to each other via the interior of the stator core 1 (especially via the through hole through which the coil winding 2 passes). Each sealed cavity is defined by the corresponding axial end face of the stator core 1 and the sealing cover to encapsulate the end of the coil winding 2 protruding from the stator core 1. One or more coolant inlets I penetrating the second sealing cover 32 are formed on the second sealing cover 32, and one or more coolant outlets O penetrating the first sealing cover 31 are formed on the first sealing cover 31. The coolant can flow into the sealed cavity C2 through the coolant inlet I on the second sealing cover 32, and then flow into the sealed cavity C1 through the inside of the stator core 1, and finally flow out of the sealed cavity C1 through the coolant outlet O on the first sealing cover 31. Driven by a device such as a hydraulic pump (not shown), the coolant can circulate through the inside of the stator core 1 through the above-mentioned path, thereby transferring and dissipating the heat generated in the stator part.

[0021] One or more lead wires 6 are led out from the end of the coil winding 2 toward the first sealing cover 31. One end of each lead wire 6 is connected to the coil winding 2, and the other end is connected to a component such as an electronic control unit for controlling the motor, which is arranged outside the stator part. Figure 1As shown, each lead wire 6 is led out of the sealed cavity C1 via the corresponding coolant outlet O. Since the coolant outlet O on the first sealing cover 31 is used as the lead-out channel of the lead wire 6, neither sealing nor connection and fixing are required between the lead wire 6 and the first sealing cover 31. In other words, the lead wire 6 can directly pass through the coolant outlet O in a non-connected and / or non-contact manner. This facilitates the lead wire 6 to be connected to the busbar of the electronic control unit through a flexible joint.

[0022] like Figure 1 As shown, in the installed state, the central axis of the stator core 1 is usually arranged in the horizontal direction. At this time, in order to enable the coolant to fully cool the stator core 1, the coolant inlet I and the coolant outlet O can be preferably distributed on the opposite sides of the horizontal plane passing through the central axis. In particular, one of the coolant inlet I and the coolant outlet O can be located at the vertical top of the corresponding sealing cover, and the other can be located at the vertical bottom of the corresponding sealing cover. This makes the coolant inlet I and the coolant outlet O distributed in the opposite direction with respect to the horizontal plane where the central axis is located, so that the coolant can better fill the space inside the entire stator core 1. Since the electronic control unit is usually located above the stator core 1, in order to facilitate the connection of the lead wire 6, the coolant outlet O can be located above the horizontal plane passing through the central axis, especially at the top of the first sealing cover 31, and the coolant inlet I can be located below the horizontal plane passing through the central axis, especially at the bottom of the second sealing cover 32.

[0023] The two sealing covers may have substantially the same shape and size. Figure 2 and Figure 4 As shown, the specific structure of the two sealing covers is described by taking the first sealing cover 31 as an example. Specifically, the first sealing cover 31 may include an outer side wall 31a, an inner side wall 31b and an end wall 31c. The outer side wall 31a and the inner side wall 31b are substantially cylindrical structures formed around the central axis, respectively, wherein the outer side wall 31a coaxially surrounds the radial outer side of the inner side wall 31b to form an annular cavity between the two. The end wall 31c is connected between the axial ends of the outer side wall 31a and the inner side wall 31b away from the stator core 1 and extends substantially perpendicular to the central axis, thereby closing an end of the annular cavity away from the stator core 1. The first sealing cover 31 is thus formed with an annular cavity that is only open to the axial end face of the stator core 1. When the first sealing cover 31 is installed on the axial end of the stator core 1, the portion of the coil winding 2 protruding from the stator core 1 will be accommodated in the annular cavity of the first sealing cover 31. At this time, the outer wall 31a is located radially outside the coil winding 2, the inner wall 31b is located radially inside the coil winding 2, and the end wall 31c is located axially outside the coil winding 2. The shape and installation method of the second sealing cover 32 are basically the same as those of the first sealing cover 31, and will not be repeated here.

[0024] like Figure 1 and Figure 3 As shown, the busbar connected to the lead wire 6 is usually located radially outside the first sealing cover 31. To this end, the coolant outlet O can preferably penetrate the outer side wall 31a of the first sealing cover 31, so that the lead wire 6 can pass through the outer side wall 31a and lead out of the sealed cavity C1 radially outward. In order to adapt to this connection direction, each lead wire 6 can have a bent structure. The bent lead wire 6 includes a first section 6a and a second section 6b. Among them, the first section 6a extends from the end of the coil winding 2 toward the end wall 31c of the first sealing cover 31, and the second section 6b extends from the end of the first section 6a facing the end wall 31c toward the radial outside and leads out of the sealed cavity C1 through the coolant outlet O.

[0025] The lead wire 6 can be bent before the first sealing cover 31 is installed on the stator core 1, or after the first sealing cover 31 is installed on the stator core 1. The order of the bending steps can be adapted by using different shapes of the coolant outlet O. For example, Figure 3 and Figure 4 In the illustrated embodiment, the coolant outlet O extends from the end wall 31c to the outer side wall 31a. This means that a portion of the coolant outlet O radially penetrates the outer side wall 31a, while another portion axially penetrates the end wall 31c, and the two portions are connected to each other. Such a coolant outlet O may be a closed orifice. Particularly preferably, the extension line of the first section 6a of the lead wire 6 may extend through the portion of the coolant outlet O located in the end wall 31c. This design is suitable for the installation method of bending the lead wire 6 after the first sealing cover 31 is installed on the stator core 1. Before the first sealing cover 31 is installed, the unbent lead wire 6 extends axially substantially along the direction of the first section 6a. When the first sealing cover 31 is installed, the unbent lead wire 6 can pass through the portion of the coolant outlet O located in the end wall 31c and extend to the outside of the first sealing cover 31, so as not to hinder the installation. After the first sealing cover 31 is installed in place, the lead wire 6 can be bent to form the first section 6a and the second section 6b. At this time, the second section 6b can pass through the portion of the coolant outlet O located in the outer side wall 31a and extend to the outside of the first sealing cover 31. In this case, the bent lead wire 6 preferably does not cross the end wall 31c in the axial direction, so as to avoid increasing the axial size of the motor assembly.

[0026] Different from Figure 3 and Figure 4 In the embodiment shown, Figure 1 and Figure 2In the illustrated embodiment, the coolant outlet O may extend axially in the outer side wall 31a to the edge of the outer side wall 31a that passes through the outer side wall 31a and faces the stator core 1, so that the coolant outlet O is formed as an orifice that is open toward the stator core 1. This design is suitable for the installation method in which the lead wire 6 is bent before the first sealing cover 31 is installed on the stator core 1. The end of the coolant outlet O facing the stator core 1 is formed as an open end, which allows the lead wire 6 bent in advance to enter the coolant outlet O through the open end when the first sealing cover 31 is installed. In this case, the coolant outlet O may be formed only on the outer side wall 31a. Particularly preferably, the end wall 31c may include a main body region R1 and a protrusion region R2 that is offset relative to the main body region R1 in a direction away from the stator core 1. The portion of the outer side wall 31a having a circumferential position corresponding to the protrusion region R2 extends axially beyond the main body region R1, thereby having a greater axial length. The coolant outlet O is located in the circumferential region of the outer wall 31 a corresponding to the protrusion region R2 , and can also extend axially beyond the main region R1 . This increases the axial dimension of the coolant outlet O to accommodate the axial position of the lead wire 6 .

[0027] It should be noted that, although in the above-mentioned embodiments, the lead wire 6 passes through the outer wall 31a and leads out of the sealed cavity C1 radially outward, in other embodiments, the lead wire 6 may also pass through the end wall 31c and lead out of the sealed cavity C1 axially outward. In this case, the coolant outlet O may only pass through the end wall 31c. It should be understood that the lead-out position and lead-out direction of the lead wire 6 and the corresponding formation position of the coolant outlet O may also be changed in various ways according to the connection requirements.

[0028] In various embodiments of the present invention, the coolant outlet O may have various shapes, such as square or circular. Preferably, the shape of the coolant outlet O may be designed according to the shape of the lead wire 6, so that the shape of the coolant outlet O is adapted to the shape of the lead wire 6. The size of the coolant outlet O may be designed according to the flow rate requirement of the coolant. In addition, the first sealing cover 31 may include one or more coolant outlets O. When the motor assembly includes a plurality of lead wires 6, each lead wire 6 may be led out of the sealed cavity C1 via a corresponding independent coolant outlet O (i.e., not sharing the same coolant outlet O with other lead wires 6), or, a plurality of lead wires 6 may also be led out of the sealed cavity C1 via a common coolant outlet O, or, a portion of the plurality of lead wires 6 each use an independent coolant outlet O and another portion use a common coolant outlet O. This may be designed according to factors such as the distribution of the lead wires 6 and the flow rate requirement of the coolant.

[0029] According to the motor assembly of the present invention, the coolant outlet on the sealing cover is used as the lead-out channel of the lead-out wire of the coil winding, so there is no need to seal, connect or fix the lead-out wire and the sealing cover. This simplifies the installation process of the lead-out wire and the structure of the sealing cover, and reduces the cost of production and assembly. At the same time, the connection flexibility between the lead-out wire and the busbar is improved, which can compensate for the assembly tolerance. In addition, this installation method can also improve the structural compactness of the motor assembly and reduce the axial size of the stator part.

[0030] Although possible embodiments are described exemplarily in the above description, it should be understood that there are still a large number of variations of embodiments through all known and other technical features and embodiments that can be easily thought of by the skilled person. It should also be understood that the exemplary embodiment is only an example and such an embodiment in no way limits the scope of protection, application and configuration of the present invention. The above description is more to provide a technical guide for converting at least one exemplary embodiment to the skilled person, wherein various changes can be made, especially changes in the functions and structures of the components, as long as they do not depart from the scope of protection of the claims.

[0031] Reference numerals list

[0032] 1 Stator core

[0033] 2 Coil windings

[0034] 31 First sealing cover

[0035] 31a Outer wall

[0036] 31b Inner wall

[0037] 31c End wall

[0038] 32 Second sealing cover

[0039] 4 Rotor

[0040] 5 Housing

[0041] 6 Lead wire

[0042] 6a Section 1

[0043] 6b Second section

[0044] C1 Sealed Chamber

[0045] C2 Seal Chamber

[0046] I coolant inlet

[0047] O Coolant outlet

[0048] R1 Main area

[0049] R2 protrusion area

Claims

1. A motor assembly, comprising a stator core (1), a coil winding (2), a first sealing cover (31) and a lead wire (6), wherein the coil winding (2) is wound on the stator core (1) and protrudes axially from two axial ends of the stator core (1), the first sealing cover (31) is installed at one of the two axial ends of the stator core (1) so as to define a sealed cavity (C1) encapsulating the coil winding (2) together with the stator core (1), the lead wire (6) is connected to the coil winding (2), and the first sealing cover (31) comprises a coolant outlet (O) penetrating the first sealing cover (31) so as to allow coolant to flow out of the sealed cavity (C1), It is characterized in that The lead-out wire (6) is led out of the sealed cavity (C1) via the coolant outlet (O).

2. The motor assembly according to claim 1, characterized in that: The first sealing cover (31) comprises an outer wall (31a) located radially outside the coil winding (2) and an end wall (31c) located axially outside the coil winding (2), and the coolant outlet (O) passes through the outer wall (31a), so that the lead wire (6) passes through the outer wall (31a) and leads out of the sealing cavity (C1) toward the radial outside.

3. The motor assembly according to claim 2, characterized in that: The lead-out wire (6) comprises a first section (6a) and a second section (6b), wherein the first section (6a) extends from the coil winding (2) toward the end wall (31c), and the second section (6b) extends radially outward from an end of the first section (6a) facing the end wall (31c) and leads out of the sealed cavity (C1) through the coolant outlet (O).

4. The motor assembly according to claim 3, characterized in that: The cooling liquid outlet (O) extends from the end wall (31c) into the outer side wall (31a).

5. The motor assembly according to claim 4, characterized in that: An extension line of the first section (6a) extends through a portion of the coolant outlet (O) located in the end wall (31c).

6. The motor assembly according to claim 3, characterized in that: The coolant outlet (O) extends axially in the outer side wall (31a) to an edge penetrating the outer side wall (31a) toward the stator core (1).

7. The motor assembly according to claim 6, characterized in that The end wall (31c) includes a main body region (R1) and a protrusion region (R2) offset relative to the main body region (R1) in a direction away from the stator core (1), wherein the protrusion region (R2) corresponds to a circumferential position of the coolant outlet (O), and the coolant outlet (O) extends axially beyond the main body region (R1).

8. The motor assembly according to claim 1, characterized in that The motor assembly further comprises a second sealing cover (32), the second sealing cover (32) being mounted at the other of the two axial ends of the stator core (1) so as to define together with the stator core (1) another sealing cavity (C2) encapsulating the coil winding (2), the other sealing cavity (C2) and the sealing cavity (C1) being communicated with each other via the interior of the stator core (1), the second sealing cover (32) comprising a cooling liquid inlet (I) penetrating the second sealing cover (32) so as to allow cooling liquid to flow into the other sealing cavity (C2), the central axis of the stator core (1) being arranged in a horizontal direction so that the cooling liquid inlet (I) and the cooling liquid outlet (O) are distributed on opposite sides of a horizontal plane passing through the central axis.

9. The motor assembly according to any one of claims 1 to 8, characterized in that: The motor assembly includes a plurality of lead wires (6).

10. The motor assembly according to claim 9, characterized in that Each of the plurality of lead-out lines (6) is led out of the sealed cavity (C1) via a corresponding independent coolant outlet (O); or The plurality of lead wires (6) are led out of the sealed cavity (C1) via a common coolant outlet (O).

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