Patent Description:
The present disclosure relates to the technical field of vehicles, and in particular, to a stator assembly, a motor, and a vehicle.

In the related art, a lead-out line of a stator is led out from a molding end. To match a height of the lead-out line, a height of the molding end is generally set to a relatively large value. This is disadvantageous to optimization of an overall size of the stator and leads to structure complexity. <CIT> discloses a dynamo-electric machine <NUM> including a stator <NUM> provided with a stator coil <NUM>. As this is visible on the drawings of this document, especially in <FIG> (reproduced below, text and arrows added), alternating current terminals 42U, 42V and 42W are set on one side of the motor stator. <CIT> discloses a stator including a three-phase stator coil. This document does not suggest setting a lead-out line for each phase of a stator winding located at a welding end. <CIT> addresses the problem of an increase of the number of ports when the number of connection points by a busbar increases.

The present disclosure aims to resolve at least one of the technical problems existing in the prior art. Therefore, the present disclosure provides a stator assembly with the features of claim <NUM>. All lead-out lines of the stator assembly are located on a welding end, so that a structure of the stator assembly is simple and is beneficial to optimization of an overall size of the stator assembly. Further, stator point lines of the stator winding are indirectly connected to the neutral line through at least one connection block.

The present disclosure also provides a motor that has the stator assembly.

The present disclosure also provides a vehicle that has the motor.

A stator assembly according to an embodiment of the present disclosure includes: a cylindrical stator core, where multiple stator slots spaced out along a circumferential direction of the stator core exist on the stator core; and a stator winding, where the stator winding includes multiple conductor segments, each of the conductor segments includes an intra-slot part disposed in a stator slot of the stator core, a first end and a second end that are disposed outside the stator core, the intra-slot part is connected between the first end and the second end, the second end of each of the multiple conductor segments forms a welding end, and a lead-out line from each phase of the stator winding is located at the welding end.

By making the lead-out line be located at the welding end, the stator assembly according to the embodiment of the present disclosure simplifies the structure and makes full use of the height space of the welding end, thereby being beneficial to optimization of the overall size of the stator assembly and facilitating connection between the lead-out line and a wiring terminal of an external circuit.

The motor according to the embodiment of the present disclosure includes the stator assembly provided in the present disclosure.

The motor according to the embodiment of the present disclosure improves overall performance of the motor by setting the stator assembly provided in the present disclosure.

The vehicle according to the embodiment of the present disclosure includes the motor provided in the present disclosure.

The vehicle according to the embodiment of the present disclosure improves overall performance of the vehicle by setting the motor provided in the present disclosure.

Additional aspects and advantages of the present disclosure will be given in the following description, some of which will become apparent from the following description or may be learned from practices of the present disclosure.

The foregoing and/or additional aspects and advantages of the present disclosure will become apparent and comprehensible in the description made with reference to the following accompanying drawings, wherein:.

The following describes embodiments of the present disclosure in detail. Examples of the embodiments are shown in the accompanying drawings, and same or similar reference signs in all the accompanying drawings indicate same or similar components or components having same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary, and are intended to explain the present disclosure and cannot be construed as a limitation to the present disclosure.

In the description of the present disclosure, it should be understood that orientation or position relationships indicated by the terms such as "center", "length", "width", "thickness", "above", "below", "vertical", "horizontal", "top", "bottom", "inside", "outside", "axial", "radial", and "circumferential" are based on orientation or position relationships shown in the accompanying drawings, and are used only for ease and brevity of illustration and description, rather than indicating or implying that the mentioned apparatus or component must have a particular orientation or must be constructed and operated in a particular orientation. Therefore, such terms should not be construed as limiting of the present disclosure. In addition, terms "first" and "second" are only used to describe the objective and cannot be understood as indicating or implying relative importance or implying a quantity of the indicated technical features. In view of this, a feature defined to be "first" or "second" may explicitly or implicitly include one or more features. In the description of the present disclosure, unless stated otherwise, the meaning of "a plurality of" is two or more than two.

In the description of the present disclosure, it should be noted that unless otherwise explicitly specified or defined, the terms such as "mount", "install", "connect", and "connection" should be understood in a broad sense. For example, the connection may be a fixed connection, a detachable connection, or an integral connection; or the connection may be a mechanical connection or an electrical connection; or the connection may be a direct connection, an indirect connection through an intermediary, or internal communication between two components. Persons of ordinary skill in the art may understand the specific meanings of the foregoing terms in the present disclosure according to specific situations.

A stator assembly <NUM> according to an embodiment of the present disclosure is described below with reference to <FIG>. The stator assembly <NUM> according to the embodiment of the present disclosure may be used in an m-phase motor, where m = <NUM>, <NUM>, <NUM>. That is, the stator assembly <NUM> may be used in a one-phase motor, a two-phase motor, a three-phase motor, and the like. The following description only uses an example in which the m-phase motor is a three-phase motor. Of course, after reading the following technical solution, a person skilled in the art apparently can understand other technical solutions in which the m-phase motor includes another number of phases. Therefore, such other technical solutions are omitted herein. Here, it should also be noted that each phase-specific winding of the stator winding has two ends, one end is a lead-out line <NUM> and the other end is a star point line <NUM>.

As shown in <FIG>, <FIG>, <FIG>, <FIG>, <FIG>, <FIG>, and <FIG>, the stator assembly <NUM> according to the embodiment of the present disclosure includes a stator core <NUM> and a stator winding <NUM>.

Specifically, the stator core <NUM> is cylindrical, and multiple stator slots exist on the stator core <NUM>. The stator slots are formed on an inner peripheral wall of the stator core <NUM>, and run through the stator core <NUM> axially (for example, in the top-down direction shown in <FIG>, <FIG>, <FIG>, <FIG>, <FIG>, <FIG>, and <FIG>). The multiple stator slots are spaced out in a circumferential direction of the stator core <NUM>, and a depth direction of the stator core is the same as a radial direction of the stator core.

In an embodiment, a rotor of a three-phase motor includes eight magnetic poles. Correspondingly, the total number of stator slots disposed on the stator core <NUM> is <NUM>.

The stator winding <NUM> includes multiple conductor segments <NUM>. Each conductor segment <NUM> includes an intra-slot part disposed in a stator slot of the stator core <NUM>, and a first end and a second end that are disposed outside the stator core <NUM>. The intra-slot part is connected between the first end and the second end, and the second ends of the multiple conductor segments <NUM> form a welding end <NUM>.

As shown in <FIG>, each conductor segment <NUM> includes an intra-slot part (such as a first intra-slot part <NUM> and a second intra-slot part <NUM> described below) and a bend part. The intra-slot part is disposed in a stator slot, and the bend part is connected to the intra-slot part. After the intra-slot part runs through the stator slot, an end of the intra-slot part (for example, an upper end of the intra-slot part shown in <FIG>) exceeds the stator core <NUM>. The end of the intra-slot part (for example, the upper end of the intra-slot part shown in <FIG>) forms a welding end <NUM> of the stator winding <NUM>.

Specifically, all lead-out lines <NUM> of each phase of the stator winding <NUM> are located on the welding end <NUM>. That is, all lead-out lines <NUM> of each phase of the stator winding <NUM> are led out of the welding end <NUM>. Generally, an axial height of the welding end <NUM> is relatively great. By making the lead-out lines <NUM> located at the welding end <NUM>, the technical solution in the present disclosure simplifies the structure and makes full use of the height space of the welding end <NUM>, thereby being beneficial to optimization of the overall height size of the stator assembly <NUM> and facilitating connection between each lead-out line <NUM> and a wiring terminal of an external circuit.

By making the lead-out lines <NUM> be located at the welding end <NUM>, the stator assembly <NUM> according to the embodiment of the present disclosure simplifies the structure and makes full use of the height space of the welding end <NUM>, thereby being beneficial to optimization of the overall size of the stator assembly <NUM> and facilitating connection between each lead-out line <NUM> and the wiring terminal of the external circuit.

According to the invention, all star point lines <NUM> of each phase of the stator winding <NUM> are located at the welding end <NUM>. Further, the star point lines <NUM> of each phase of the stator winding <NUM> are a part of the welding end <NUM>. Further, the stator assembly <NUM> further includes a neutral line <NUM>. The neutral line <NUM> is connected to the star point lines <NUM> of each phase of the stator winding. In other words, each of the star point lines <NUM> of each phase is connected to the neutral line <NUM>. In this way, a junction between the star point line <NUM> of each phase and the neutral line <NUM> occupies only a small space, and a connection manner is simpler.

Preferably, the neutral line <NUM> is an integrally molded part.

A specific embodiment of the stator assembly <NUM> of the present disclosure is described below.

As shown in <FIG> and <FIG>, the stator assembly <NUM> in this embodiment is used in a three-phase motor. The stator winding <NUM> of the three-phase motor is a three-phase winding and includes a U-phase winding, a V-phase winding, and a W-phase winding. The number of parallel branches in each phase-specific winding is <NUM>. That is, two branches are connected in parallel. Of course, the number of parallel branches of each phase-specific winding may also be <NUM>, <NUM>, <NUM>, or <NUM> or more. The following description only uses an example in which the number of parallel branches of each phase-specific winding is <NUM>. After reading the following technical solution, a person skilled in the art apparently can understand other technical solutions in which the number of parallel branches of each phase-specific winding is <NUM>, <NUM>, <NUM>, or <NUM>. Therefore, such other technical solutions are omitted herein.

When the three-phase winding adopts a Y-shaped connection (that is, a star connection), one end of each line in each phase-specific winding is a lead-out line <NUM> and the other end is a star point line <NUM>. That is, the stator winding <NUM> has a total of six lead-out lines <NUM> and six star point lines <NUM>. The lead-out lines <NUM> are used for electrical connection with an external circuit, and the star point lines <NUM> are connected together through a neutral line <NUM>.

Specifically, as shown in <FIG>, the six lead-out lines <NUM> of the three-phase winding are: a first U-phase lead-out line 25a, a second U-phase lead-out line 25b, a first V-phase lead-out line 25c, a second V-phase lead-out line 25d, a first W-phase lead-out line 25e, and a second W-phase lead-out line 25f. The six star point lines <NUM> of the three-phase winding are: a first U-phase star point line 24a, a second U-phase star point line 24b, a first V-phase star point line 24c, a second V-phase star point line 24d, a first W-phase star point line 24e, and a second W-phase star point line 24f.

Further, each of the six star point lines <NUM> is connected to the neutral line <NUM>. That is, each star point line <NUM> in each phase is connected to the neutral line <NUM>.

In the related art, the neutral line includes a UV connection line that connects a neutral point connection part of a U-phase winding and a neutral point connection part of a V-phase winding, and includes a VW connection line that connects a neutral point connection part of a V-phase winding and a neutral point connection part of a W-phase winding. The neutral line in the above technology uses two U-shaped lines to connect every two of the three connection parts. In this way, the welding part in the middle is thicker and occupies more space, and welding performance is hardly securable. Therefore, in the embodiment of the present disclosure, the axial and radial space of the stator assembly <NUM> occupied by the connection part between the neutral line <NUM> and the star point line <NUM> can be reduced, thereby making the structure more compact, simplifying the connection manner, and facilitating mass production.

By configuring the integrally formed neutral line <NUM> and connecting the star point lines <NUM> of each phase to the neutral line <NUM>, the stator assembly <NUM> according to the embodiment of the present disclosure achieves the neutral line in the related art in which the neutral line uses two U-shaped lines to connect every two of three connection parts of the star point lines, thereby simplifying the connection structure of the star point line <NUM> and the neutral line <NUM>, decreasing welding parts, and reducing the occupied axial and radial space of the stator assembly <NUM>, making the structure compact, minimizing the space occupied by a casing and an end cover of the motor, and meeting miniaturization requirements of the motor.

In some embodiments, a cross section of the conductor segment <NUM>, which is perpendicular to a length direction thereof, is non-circular. Preferably, the shape of the cross section of the conductor segment <NUM> is rectangular. The cross section of the conductor segment <NUM>, which is perpendicular to the length direction thereof, is rectangular, so as to increase a full-slot ratio of coils in the stator slot. In other words, by configuring rectangular cross section of the conductor segment <NUM>, more conductor segments <NUM> can be arranged in the stator slot of the same volume, so that the multiple conductor segments <NUM> in the stator slot are arranged more compactly. Of course, the cross section of the conductor segment <NUM>, which is perpendicular to the length direction thereof, may also be another shape such as a trapezoid.

In some embodiments, the conductor segment <NUM> may be a U-shaped conductor segment. The U-shaped conductor segment includes a first intra-slot part <NUM> and a second intra-slot part <NUM> that are disposed in the stator slot. The first end of the conductor segment <NUM> is a U-shaped bend part <NUM> that connects one end of the first intra-slot part <NUM> and one end of the second intra-slot part <NUM>. The U-shaped bend part <NUM> in each U-shaped conductor segment forms a hairpin end <NUM> of the stator winding, and the other end of the first intra-slot part <NUM> and the other end of the second intra-slot part <NUM> extend to form a welding end <NUM> of the stator winding.

Specifically, as shown in <FIG>, the U-shaped conductor segment <NUM> includes a U-shaped bend part <NUM>, a first intra-slot part <NUM>, and a second intra-slot part <NUM>. The first intra-slot part <NUM> and the second intra-slot part <NUM> are both disposed in the stator slot, and are connected to the U-shaped bend part <NUM>. After the first intra-slot part <NUM> and the second intra-slot part <NUM> run through the stator slot, the ends thereof exceed the stator core <NUM>. For example, as shown in <FIG>, a lower end of the first intra-slot part <NUM> and a lower end of the second intra-slot part <NUM> are both connected to the U-shaped bend part <NUM>, and an upper end of the first intra-slot part <NUM> and an upper end of the second intra-slot part <NUM> both run through the stator slot, and protrude out of the axial end of the stator core <NUM> (for example, the upper end of the stator core <NUM> shown in <FIG>) to facilitate connection of multiple conductor segments <NUM>.

The U-shaped bend part <NUM> in the multiple conductor segments <NUM> is located at a hairpin end <NUM> of the stator winding <NUM>, and the other ends of the first intra-slot part <NUM> and the second intra-slot part <NUM> extend to form a welding end <NUM> of the stator winding <NUM>. For clarity in the present disclosure, it is assumed that, in the drawing, the welding end <NUM> is located at the upper end, and the hairpin end <NUM> is located at the lower end.

Specifically, the neutral line <NUM> surrounds the welding end <NUM> of the stator winding <NUM> in a circumferential direction of the stator winding, thereby reducing a distance between the star point line <NUM> and the neutral line <NUM> and facilitating connection between the neutral line <NUM> and the star point line <NUM> of the welding end <NUM>.

In an example not enclosed by the claims, the star point lines <NUM> of each phase of the stator winding are directly connected through the neutral line <NUM>. That is, all the star point lines <NUM> are directly connected to the neutral line <NUM>, and the multiple star point lines <NUM> are connected together by being connected to the neutral line <NUM>, rather than indirectly connected to the neutral line <NUM> through an intermediate transition connector (such as a connection block <NUM> described below). In short, by using the neutral line <NUM>, all the star point lines <NUM> in the stator winding are connected together directly In this way, the connection is convenient, simple, and quick. For example, each star point line <NUM> in each phase-specific winding in the stator winding <NUM> is directly welded to the neutral line <NUM>.

When each phase includes multiple star point lines <NUM>, the multiple star point lines <NUM> in each phase may be separately connected to the neutral line <NUM>.

In addition, the multiple star point lines <NUM> in each phase may also be combined and connected together and then connected to the neutral line. Specifically, the multiple star point lines <NUM> in each phase may be directly welded, or welded through a connection bar. For example, the terminals of the multiple star point lines <NUM> in each phase extend upward vertically, the terminals of the multiple star point lines <NUM> in each phase are welded and connected together, and then welded to the neutral line <NUM>.

In some examples, the star point lines <NUM> of each phase of the stator winding <NUM> are in surface contact with and welded to the neutral line <NUM>. This improves connection efficiency and connection reliability. Here, the surface contact between the star point lines <NUM> and the neutral line <NUM> means that a surface at one side of a star point line <NUM> fits and contacts a surface at one side of the neutral line <NUM> to increase a contact area between the star point line <NUM> and the neutral line <NUM> and improve welding reliability. For example, the surface of each star point line <NUM> at the side facing the neutral line <NUM> fits and contacts the surface of the neutral line <NUM> at the side facing the star point line <NUM>, and then welded and connected together.

In some examples, as shown in <FIG>, the terminal of each star point line <NUM> of each phase of the stator winding <NUM> extends outward in an axial direction of the stator core (for example, in an upward direction shown in <FIG>), and forms an axial protrusion <NUM>. The neutral line <NUM> is connected to each axial protrusion <NUM>.

Specifically, the axial protrusion <NUM> exceeds the end of the welding end <NUM> by a preset distance. The preset distance is greater than or equal to a length of the neutral line <NUM> in an axial direction of the stator core <NUM> (for example, in the top-down direction shown in the drawing). Preferably, the preset distance is greater than the length of the neutral line <NUM> in the axial direction of the stator core <NUM>. Here, the length of the neutral line <NUM> in the axial direction of the stator core <NUM> means a height size of the neutral line <NUM> in the axial direction of the stator core <NUM>.

Specifically, the neutral line <NUM> is welded to a radial outer surface of the axial protrusion <NUM>. This simplifies the structure, facilitates welding, and reduces the occupation space in the radial direction.

Specifically, as shown in <FIG>, in the top-down direction shown in <FIG>, the terminal of the star point line <NUM> extends upward and an upper end face thereof is higher than an upper end face of the welding end <NUM>. A distance between the upper end face of the star point line <NUM> and the upper end face of the welding end <NUM> is not less than the height of the neutral line <NUM> in the top-down direction. In this way, when the end of the star point line <NUM> is in-out opposite to and connected to the neutral line <NUM> in the radial direction of the stator core <NUM>, the outermost line on the welding end <NUM> can be spaced apart from the neutral line <NUM> in the axial direction of the stator core <NUM> to avoid interference.

Here, it should be noted that the neutral line <NUM> may be welded at the end of the terminal of the star point line <NUM>, or may be connected to a middle part of the terminal, which does not make much difference in the electrical connection effect.

As shown in <FIG>, the star point lines <NUM> of each phase of the stator winding are located at a sub-outermost layer in the radial direction of the stator winding. That is, the star point lines <NUM> are located at a sub-outermost layer of the stator winding <NUM> in the radial direction of the stator core <NUM>.

Here, it should be noted that the lead-out position of the star point lines <NUM> and the lead-out position of the lead-out lines <NUM> depend on the winding manner of the stator winding <NUM>. The specific winding manner used by the stator assembly <NUM> in this embodiment will be described in detail below. After the stator assembly <NUM> according to this embodiment of the present disclosure finally completes winding by using the following winding manner, the star point lines <NUM> of each phase are located at the sub-outermost layer of the stator winding <NUM>, the lead-out lines <NUM> of each phase are located at the outermost layer of the stator winding <NUM>. When other winding manners are applied, the star point lines of each phase may be located at the outermost layer of the stator winding.

In some examples, as shown in <FIG>, the terminal of each star point line <NUM> of each phase of the stator winding <NUM> may extend outward in a radial direction of the stator core <NUM> and bend at a preset angle to form a radial protrusion <NUM>. The neutral line <NUM> is connected to each radial protrusion <NUM>. This makes it convenient for the neutral line <NUM> to dodge, in the radial direction of the stator core <NUM>, the outermost line on the welding end <NUM> to avoid interference.

When each phase includes multiple star point lines <NUM>, all the terminals of the multiple star point lines <NUM> in each phase may extend outward in the radial direction of the stator core <NUM>, and bend at a preset angle, and may be welded to neutral line <NUM> after being welded together and connected. This makes it convenient for the neutral line <NUM> to dodge, in the radial direction of the stator core <NUM>, the outermost line on the welding end <NUM> of the stator winding to avoid interference.

Specifically, the radial protrusions <NUM> exceed the outermost layer of the stator winding by a preset distance, and the preset distance is greater than or equal to a length of the neutral line in the radial direction of the stator core. Preferably, the preset distance is greater than the length of the neutral line in the radial direction of the stator core. Here, the length of the neutral line in the radial direction of the stator core means a thickness size of the neutral line in the radial direction of the stator core.

Specifically, the neutral line is welded to a radial outer surface of the radial protrusion <NUM>. This simplifies the structure, facilitates welding, and reduces the occupation space in the axial direction.

The neutral line <NUM> is further described below with reference to accompanying drawings.

In some embodiments, as shown in <FIG> and <FIG>, the neutral line <NUM> may form an arc segment shape. In this case, the arc segment-shaped neutral line <NUM> may be substantially parallel to a circumferential direction of the stator core <NUM> to facilitate connection between the neutral line <NUM> and multiple star point lines <NUM> that are spaced out in a circumferential direction of the stator core <NUM>.

Further, as shown in <FIG>, a cross section of the neutral line <NUM> is circular or rectangular, and a cross section of the neutral line <NUM>, which is perpendicular to the length direction thereof, may be circular; and the cross section of the neutral line <NUM>, which is perpendicular to the length direction thereof, may also be rectangular, as shown in <FIG>. Of course, the present disclosure is not limited to this, and the cross section of the neutral line <NUM>, which is perpendicular to the length direction thereof, may also be oblate, polygonal, or of other shapes.

As shown in <FIG>, in some examples not covered by the invention, the neutral line <NUM> may include an arc-shaped connector <NUM> and multiple antennae <NUM>. The antennae <NUM> are each connected to the star point lines <NUM> of each phase of the stator winding, and the arc-shaped connector <NUM> connects the multiple antennae <NUM>. Therefore, interference between the arc-shaped connector <NUM> and the outermost winding at the welding end <NUM> can be avoided.

Further, a gap exists radially between the arc-shaped connector <NUM> and the outermost layer of the stator winding. Therefore, interference between the arc-shaped connector <NUM> and a radial outermost winding at the welding end <NUM> can be further avoided.

The neutral line <NUM> may include multiple antennae <NUM> that are in one-to-one correspondence to the star point lines <NUM>, so that each antenna <NUM> is connected to one corresponding star point line <NUM>. For example, when the motor includes three phases and each phase-specific winding includes two parallel branches, a winding coil has six star point lines <NUM>. In this case, the neutral line <NUM> applied to the stator assembly <NUM> has six antennae <NUM>, as shown in <FIG>. When the motor includes three phases and each phase-specific winding has one parallel branch, a winding coil has three star point lines <NUM>. In this case, three antennae <NUM> may be configured on the neutral line applied to the stator assembly <NUM>, as shown in <FIG>.

As shown in <FIG>, each antenna <NUM> may include a first connection segment <NUM>, a second connection segment <NUM>, and a bend segment <NUM>. The bend segment <NUM> is connected between the first connection segment <NUM> and the second connection segment <NUM>, the first connection segment <NUM> is connected to the arc-shaped connector <NUM>, and the second connection segment <NUM> is welded to the terminal of the star point line <NUM>.

Specifically, the first connection segment <NUM> and the second connection segment <NUM> smoothly transition through the bend segment <NUM>.

Optionally, as shown in <FIG>, the antenna <NUM> extends out of an upper surface of the arc-shaped connector <NUM>, and both the first connection segment <NUM> and the second connection segment <NUM> extend upward. That is, the first connection segment <NUM> is connected to the upper surface of the arc-shaped connector <NUM> and extends upward, the bend segment <NUM> is connected to an upper end of the first connection segment <NUM>, and a lower end of the second connection segment <NUM> is connected to the bend segment <NUM>.

In addition, the first connection segment <NUM> of the antenna <NUM> may also extend inward from a radial inner surface of the arc-shaped connector <NUM>, and the second connection segment <NUM> extends upward and is welded to the star point line <NUM> that extends outward (upward) in an axial direction of the stator core <NUM>. For example, the first connection segment <NUM> is connected to the inner surface of the arc-shaped connector <NUM> and extends radially inward, the second connection segment <NUM> extends vertically upward, and the bend segment <NUM> is connected between the horizontal first connection segment <NUM> and the vertical second connection segment <NUM>. In this case, the antennae <NUM> are substantially L-shaped.

Of course, the present disclosure is not limited to this. As shown in <FIG>, the antennae <NUM> may also form a shape of a straight line segment, and the antennae <NUM> may extend inward from the radial inner surface of the arc-shaped connector <NUM>, and the antennae <NUM> are welded to the terminal of the star point line <NUM>. Further, the antennae <NUM> may be welded to an outward bent terminal of the star point line <NUM>.

Specifically, as shown in <FIG>, the star point lines <NUM> of each phase of the stator winding are located at the sub-outermost layer in the radial direction of the stator winding.

Here, it should be noted that when the neutral line <NUM> has antennae <NUM>, at least a part of the antennae <NUM> extends radially inward. In this way, by welding the inward extending antennae <NUM> to the terminal of the star point line <NUM>, it is convenient to space the arc-shaped connector <NUM> apart from the outermost winding of the welding end <NUM> to avoid interference. For example, when the neutral line <NUM> has antennae <NUM>, after the antennae <NUM> on the neutral line <NUM> are connected to the star point lines <NUM>, there is an avoidance space <NUM> between two adjacent corresponding antennae <NUM>. The avoidance space <NUM> is suitable for accommodating the outermost layer of the stator winding located between the star point lines <NUM> of two adjacent phases.

According to the invention, the neutral line <NUM> is indirectly connected to the star point line <NUM>. Specifically, as shown in <FIG>, the star point lines <NUM> of each phase of the stator winding are indirectly connected to the neutral line <NUM> through at least one connection block <NUM>. Still as shown in <FIG>, when each phase includes multiple star point lines, the combined multiple star point lines in each phase are indirectly connected to the neutral line through at least one connection block.

Of course, each star point line of each phase is indirectly connected to the neutral line through at least one connection block.

Referring to <FIG>, multiple connection blocks <NUM> may exist, and the multiple connection blocks <NUM> are connected between the star point line <NUM> and the neutral line <NUM> in a one-to-one correspondence manner. By setting a connection block <NUM> for indirect connecting, the size of a single welding point can be reduced, applicability to one or more (parallel branches in each phase-specific winding) is achieved, the structure is stable, and it is convenient to replace the connection block <NUM>. When each phase includes multiple star point lines, there may be multiple connection blocks that correspond to the multi-phase windings one to one, and the multiple connection blocks are connected one to one to the combined and connected star point lines in each phase.

Alternatively, there may be multiple connection blocks that are connected one to one to the star point lines in each phase.

Specifically, the star point lines <NUM> are in surface contact with and welded to the connection blocks <NUM>, and the neutral line <NUM> is in surface contact with and welded to the connection blocks <NUM>.

The connection blocks <NUM> are further described below with reference to <FIG>.

In some examples, as shown in <FIG>, two opposite surfaces of a connection block <NUM> are connected to the star point line <NUM> and the neutral line <NUM> respectively. Preferably, the two opposite surfaces of the connection block <NUM> are parallel. In this way, the structure is simplified, the implementation is easy, and less space is occupied. Here, when the star point line <NUM>, the connection block <NUM>, and the neutral line <NUM> are in-out opposite to each other in the radial direction of the stator core <NUM>, the radial inner surface and the radial outer surface of the connection block <NUM> are connected to the star point line <NUM> and the neutral line <NUM> respectively. When the star point line <NUM>, the connection block <NUM>, and the neutral line <NUM> are top-down opposed to each other in the axial direction of the stator core <NUM>, the upper surface and the lower surface of the connection block <NUM> are connected to the star point line <NUM> and the neutral line <NUM> respectively.

Specifically, as shown in <FIG>, terminals of the star point lines of each phase of the stator winding <NUM> extend in the axial direction of the stator core <NUM>, a radial inner surface of each connection block <NUM> is welded to a radial outer surface of the terminals of the star point lines <NUM>, and the radial outer surface of the connection block <NUM> is welded to the neutral line <NUM>.

When each phase includes multiple star point lines, the radial inner surface of each connection block may be welded to the radial outer surface of the terminal of any one of the multiple combined star point lines, and the radial outer surface of the connection block <NUM> is welded to the neutral line <NUM>.

Alternatively, the radial inner surface of each connection block may be welded to the radial outer surface of the terminal of each star point line of each phase, and the radial outer surface of the connection block <NUM> may be welded to the neutral line <NUM>.

Specifically, the terminal of each star point line <NUM> of each phase of the stator winding <NUM> may extend outward in the radial direction of the stator core <NUM> and bend at a preset angle to form a radial protrusion <NUM>. The connection block is connected to the radial protrusion.

Specifically, in the axial direction of the stator core, the height of the connection block is not greater than the height of the terminal of the star point line. For example, as shown in <FIG>, an upper end surface of the connection block is not higher than an upper end surface of the terminal of the star point line. This facilitates connection between the connection block and the star point line, and avoids occupation of additional space.

Specifically, in the axial direction of the stator core <NUM> (for example, the top-down direction shown in <FIG>), the distance of the connection block <NUM> is less than or equal to the distance of the neutral line <NUM>. Here, the distance of the connection block in the axial direction of the stator core means the height or size of the connection block in the axial direction of the stator core; and the distance of the neutral line means the height or size of the neutral line in the axial direction of the stator core. For example, neither end of the connection block <NUM> in the axial direction of the stator core <NUM> exceeds either end of the neutral line <NUM> in the axial direction of the stator core <NUM>.

As shown in <FIG>, the connection block <NUM> forms a cuboid shape, and both the cross section of the neutral line <NUM> and the cross section of the terminal of the star point line <NUM> are square. The radial inner surface and the radial outer surface of the connection block <NUM> fit and are welded to the star point line <NUM> and the neutral line <NUM> respectively. The upper surface of the connection block <NUM> is flush with the upper surface of the terminal of the star point line <NUM> and the upper surface of the neutral line <NUM>, and the lower surface of the connection block <NUM> is flush with the lower surface of the neutral line <NUM>.

Specifically, in the radial direction of the stator core <NUM>, the cross-sectional area of the connection block <NUM> connected to all star point lines in each phase is greater than or equal to a sum of cross-sectional areas of all star point lines <NUM> in each phase. For example, when there is only one star point line in a phase-specific winding, the cross-sectional area of the connection block <NUM> in the radial direction is not less than the cross-sectional area of the star point line <NUM>. When there are two parallel branches in a phase-specific winding, the cross-sectional area of the connection block <NUM> in the radial direction is not less than the sum of the cross-sectional areas of the two star point lines <NUM> in this phase. When there are three parallel branches in a phase-specific winding, the cross-sectional area of the connection block <NUM> in the radial direction is not less than the sum of the cross-sectional areas of the three star point lines <NUM> in this phase, so as to meet requirements of electrical connection between the connection block and the star point line. Specifically, according to a calculation formula of resistance, the resistance of a conductor is inversely proportional to the cross-sectional area of the conductor. Therefore, because the cross-sectional area of the connection block <NUM> is greater than or equal to the sum of the cross-sectional areas of the star point lines <NUM> in each phase in a direction perpendicular to the length direction thereof, and the resistance of a unit length of the connection block <NUM> is less than or equal to the resistance of a unit length of each star point line <NUM> in each phase, heat generated per unit length of the connection block <NUM> is less than or equal to heat generated per unit length of each star point line <NUM>, thereby avoiding the problem of local overheat of the connection block <NUM>.

In some examples, as shown in <FIG>, an accommodation space <NUM> may exist in the connection block <NUM>, and the neutral line <NUM> runs through and is accommodated in the accommodation space <NUM>, thereby reducing the occupied space. In addition, during operation of a motor, vibration may occur to different degrees. The vibration tends to cause detaching of the welding part between the neutral line and the star point line. Therefore, the neutral line <NUM> runs through and is accommodated in the accommodation space <NUM>, so that the connection between the neutral line and the accommodation space is more stable to prevent easy detaching of the neutral line. Optionally, the accommodation space <NUM> may form an arc shape, a U shape, or a polygon.

Specifically, as shown in <FIG>, the terminal of the star point line <NUM> extends in the axial direction of the stator core (for example, in the top-down direction shown in <FIG>). The connection block <NUM> is constructed as a U shape, and the connection block <NUM> may include an inner leg <NUM> and an outer leg <NUM>. The inner leg <NUM> takes on a long strip shape that extends vertically away from the stator core <NUM> and in the axial direction of the stator core <NUM>. The outer leg <NUM> also takes on a long strip shape that extends vertically away from the stator core <NUM> and in the axial direction of the stator core <NUM>. The inner leg <NUM> and the outer leg <NUM> are spaced out in the radial direction of the stator core <NUM>. In the radial direction of the stator core, the inner leg <NUM> is located inside the outer leg <NUM>. The inner leg <NUM> is welded to the terminal of the star point line <NUM>, and the neutral line <NUM> is welded between the inner leg <NUM> and the outer leg <NUM>.

As shown in <FIG>, when each phase includes multiple star point lines, the inner leg may be welded to the terminal of any of the multiple combined star point lines in each phase, and the neutral line is welded between the inner leg and the outer leg.

Alternatively, the inner leg may be welded to the terminal of each star point line of each phase, and the neutral line is welded between the inner leg and the outer leg.

Optionally, the neutral line <NUM> may be welded to the radial inner surface of the outer leg <NUM>, and the neutral line <NUM> is spaced apart from a U-shaped bottom wall <NUM> connected to the bottom of the outer leg <NUM> and the inner leg <NUM>. Of course, the present disclosure is not limited to this, and the neutral line <NUM> may also be welded to a U-shaped bottom wall <NUM> connected to the bottom of the outer leg <NUM> and the inner leg <NUM>. That is, the neutral line <NUM> may also be welded to the U-shaped bottom wall <NUM>, where the U-shaped bottom wall <NUM> is connected to the bottom of the outer leg <NUM> and the inner leg <NUM>.

Further, as shown in <FIG>, the top of the accommodation space <NUM> is open, so that the neutral line <NUM> can extend into the accommodation space <NUM> from top downward, and the assembling is convenient. Preferably, a top surface of the neutral line <NUM> is flush with a top surface of the connection block <NUM> to reduce the occupied space.

In some examples, the neutral line <NUM> is an arc-shaped line segment with a rectangular cross-section, and the neutral line <NUM> of the arc-shaped line segment is concentric with the stator core <NUM>. This leads to uniform radial distances between neutral line <NUM> and multiple star point lines <NUM> that are spaced out circumferentially, and facilitates connection between the neutral line <NUM> and each star point line <NUM>.

Further, a width of the neutral line <NUM> in the radial direction of the stator core <NUM> is less than a height of the neutral line <NUM> in the axial direction of the stator core <NUM>, thereby reducing the space occupied in the radial direction and facilitating connection.

In some embodiments of the present disclosure, after the neutral line <NUM> is connected to the star point line <NUM>, an avoidance space <NUM> is defined between the neutral line <NUM> and the welding end <NUM>. The avoidance space <NUM> is adapted to accommodate the outermost layer of the stator winding located between the star point lines <NUM> of two adjacent phases. For example, as shown in <FIG>, the neutral line <NUM> has multiple inward extending antennae <NUM>. Each antenna <NUM> is welded to a corresponding star point line <NUM>. After the antenna <NUM> on the neutral line <NUM> is connected to the star point line <NUM>, an avoidance space <NUM> exists between corresponding antennae <NUM> of the two adjacent phases, and the outermost layer of the stator winding between the star point lines <NUM> of the two adjacent phases can be accommodated in the avoidance space <NUM> to avoid interference between the winding and the neutral line <NUM>.

In some embodiments of the present disclosure, a span of the neutral line in a circumferential direction of the stator core is greater than or equal to a maximum span of the star point lines of each phase in the circumferential direction, so as to ensure that the neutral line is long enough to connect the star point lines of each phase. For example, as shown in <FIG>, the length of the neutral line in the circumferential direction of the stator core is not less than a distance between two star point lines in the circumferential direction of the stator core, where two star point lines are spaced farthest apart in the star point lines of three phases. That is, the span of the neutral line in the circumferential direction is greater than or equal to the span of the star point lines of three phases in the circumferential direction, so that the neutral line can be connected to the star point lines of three phases.

Optionally, a cross-sectional area of the neutral line is greater than or equal to a cross-sectional area of the star point line of each phase.

Specifically, the cross-sectional area of the neutral line in a direction perpendicular to the length direction thereof is greater than or equal to the cross-sectional area of the star point line in a direction perpendicular to the length direction thereof.

In some embodiments of the present disclosure, the cross-sectional area of the neutral line <NUM> in the radial direction of the stator core is greater than or equal to the sum of the cross-sectional areas of all star point lines <NUM> in each phase. Specifically, when the number of winding parallel branches of the stator winding <NUM> is <NUM>, the cross-sectional area of the neutral line <NUM> is greater than or equal to the cross-sectional area of the star point line <NUM>; when the number of winding parallel branches of the stator winding <NUM> is <NUM>, the cross-sectional area of the neutral line <NUM> is greater than or equal to the sum of the cross-sectional areas of the two branches, so as to meet requirements of electrical connection between the neutral line <NUM> and the star point line <NUM>. Specifically, according to a calculation formula of resistance, the resistance of a conductor is inversely proportional to the cross-sectional area of the conductor. Therefore, because the cross-sectional area of the neutral line <NUM> is greater than or equal to the sum of the cross-sectional areas of the star point lines <NUM> in each phase in a direction perpendicular to the length direction thereof, and the resistance of a unit length of the neutral line <NUM> is less than or equal to the resistance of a unit length of each star point line <NUM> in each phase, heat generated per unit length of the neutral line <NUM> is less than or equal to heat generated per unit length of each star point line <NUM>, thereby avoiding the problem of local overheat of the neutral line <NUM>.

In some embodiments of the present disclosure, the neutral line <NUM> may be a flat line with a rectangular cross-section. Further, in an extension direction of the neutral line <NUM>, the cross-sectional areas thereof are the same.

In some embodiments of the present disclosure, the neutral line <NUM> may be a crimped copper bar. The neutral line <NUM> may also be a copper wire with a circular cross-section. Of course, in some embodiments of the present disclosure, the neutral line <NUM> may also be a scattered line.

Preferably, the material of the neutral line <NUM> may be the same as that of the conductor segment <NUM>, so as to improve reliability of the connection between the neutral line <NUM> and the star point line <NUM>.

In some embodiments of the present disclosure, as shown in <FIG>, the multiple star point lines <NUM> in each phase are combined and connected before being connected to the neutral line <NUM>. Optionally, the multiple star point lines <NUM> in each phase may be directly welded, or welded through a connection bar.

For example, as shown in <FIG>, the number of parallel branches of each phase-specific winding is <NUM>. During the process of connecting the neutral line <NUM>, two star point lines <NUM> in the same phase may be welded together first, and then one of the star point lines <NUM> is welded to the connection block <NUM>, and the connection block <NUM> is welded to the neutral line <NUM>.

In some embodiments of the present disclosure, as shown in <FIG>, the number of winding parallel branches of the stator winding <NUM> is at least one, and each star point line <NUM> of each phase is separately connected to the neutral line <NUM>.

According to some embodiments of the present disclosure, the terminals of the lead-out lines <NUM> in each phase are connected. Optionally, the multiple lead-out lines <NUM> in each phase may be directly welded, or welded through a connection bar. Nevertheless, the present disclosure is not limited to this. The terminals of the multiple lead-out lines <NUM> in each phase may be disconnected. For example, the terminals of the multiple lead-out lines <NUM> in each phase are arranged in parallel.

Further, the terminals of the lead-out lines <NUM> in each phase are directly connected to a wiring terminal of an external circuit. This not only simplifies the structure, but also saves a connection structure between the terminals of the lead-out lines <NUM> and the wiring terminal of the external circuit, and achieves simplicity and reliability.

Optionally, as shown in <FIG>, <FIG>, <FIG>, <FIG>, <FIG>, <FIG>, and <FIG>, the lead-out lines <NUM> are located at the outermost layer in the radial direction, and the terminals of the lead-out lines <NUM> extend horizontally away from the central axis of the stator core <NUM>. In other words, the terminals of the lead-out lines <NUM> extend outward in the radial direction of the stator core <NUM>. This not only simplifies the structure, but also facilitates connection between the lead-out lines <NUM> and an external circuit.

Referring to <FIG>, a motor <NUM> according to an embodiment in the second aspect of the present disclosure includes a stator assembly <NUM> according to an embodiment in the first aspect of the present disclosure.

The structures and operations of other components such as a rotor of the motor <NUM> according to the embodiment of the present disclosure are well known to those skilled in the art, and are omitted herein.

The motor <NUM> according to the embodiment of the present disclosure improves overall performance of the motor <NUM> by setting the stator assembly <NUM> according to an embodiment in the first aspect of the present disclosure.

Referring to <FIG>, a vehicle <NUM> according to a third aspect of the present disclosure includes a motor <NUM> according to an embodiment of the second aspect of the present disclosure.

The vehicle <NUM> according to the embodiment of the present disclosure improves overall performance of the vehicle <NUM> by setting the motor <NUM> according to an embodiment in the second aspect of the present disclosure.

Referring to <FIG>, the following describes a winding method of a stator winding in a stator assembly according to an embodiment of the present invention using an example in which the stator assembly in the embodiment of the present disclosure is applied to an <NUM>-pole <NUM>-slot <NUM>-phase motor. That is, the number of stator slots is z = <NUM>, and the number of phases is m = <NUM>, where three phases include U phase, V phase, and W phase; and the number of poles is 2p = <NUM> (that is, the number of pole pairs is <NUM>), and each of the three phases includes two lines.

As shown in <FIG>, in a stator winding <NUM> of a stator assembly <NUM>, each pitch between a first intra-slot part <NUM> and a second intra-slot part <NUM> of a U-shaped conductor segment <NUM> is y stator slots, where y is an integer and y = z/2p. For an <NUM>-pole <NUM>-slot stator assembly <NUM>, y = <NUM>. That is, the first intra-slot part <NUM> is spaced apart from the second intra-slot part <NUM> of each U-shaped conductor segment <NUM> by <NUM> stator slots.

In the following description, the present disclosure is described by using an example in which each stator slot <NUM> includes <NUM> layers. The <NUM> slot layers include layers a, b, c, d, e, and f arranged in sequence. In each stator slot <NUM>, the innermost layer in the radial direction of the stator core <NUM> is layer a, and the outermost layer is layer f. Explanation of the slot layers: Specifically, after the stator winding is inserted into the stator slot <NUM>, multiple layers formed by the stator winding exist in the stator slot. In some embodiments of the present invention, the slot layers include layers a, b, c d, e, and f arranged in sequence. In each stator slot <NUM>, the innermost layer in the radial direction of the stator core <NUM> is layer a, and the outermost layer is layer f.

In the stator assembly shown in <FIG>, each star point line is spaced apart from the lead-out line of the U phase by <NUM> stator slots, and two lines of each phase are spaced out by <NUM> stator slot in the circumferential direction; adjacent corresponding star point lines in the U phase, the V phase, and the W phase are spaced out by <NUM> stator slots in the circumferential direction; and adjacent corresponding lead-out lines in the U phase, the V phase, and the W phase are spaced out by <NUM> stator slots in the circumferential direction.

More specifically, as shown in <FIG> and <FIG>, the first lead-out line U1A of the U phase is spaced apart from the second lead-out line U2A of the U phase by <NUM> stator slot, and the first lead-out line V1A of the V phase is spaced apart from the second lead-out line V2A of the V phase by <NUM> stator slot; and the first lead-out line W1A of the W phase is spaced apart from the second lead-out line W2A of the W phase by <NUM> stator slot.

As shown in <FIG> and <FIG>, the first lead-out line U1A of the U phase is spaced apart from the first star point line U1B of the U phase by <NUM> stator slots, and the second lead-out line U2A of the U phase is spaced apart from the second star point line U2B of the U phase by <NUM> stator slots. Similarly, the lead-out line V1A of the V phase is spaced apart from the star point line V1B of the V phase by <NUM> stator slots, and the lead-out line V2A of the V phase is spaced apart from the star point line V2B of the V phase by <NUM> stator slots; the lead-out line W1A of the W phase is spaced apart from the star point line W1B of the W phase by <NUM> stator slots, and the lead-out line W2A of the W phase is spaced apart from the star point line W2B of the W phase by <NUM> stator slots.

Further, the adjacent corresponding star point lines in the U phase, V phase, and W phase are spaced out by <NUM> stator slots in the circumferential direction. Specifically, using the first line as an example, the first star point line U1B of the U phase, the first star point line V1B of the V phase, and the first star point line W1B of the W phase are spaced out by <NUM> slots at intervals in the circumferential direction. For example, as shown in <FIG>, U1B is led out of layer e of slot <NUM>, V1B is led out of layer e of slot <NUM>, and W1B is led out of layer e of slot <NUM>. Similarly, the second lines U2B, V2B, and W2B are led out of layer e of slot <NUM>, layer e of slot <NUM>, and layer e of slot <NUM> respectively, and are spaced out by <NUM> stator slots at intervals.

Correspondingly, the adjacent corresponding lead-out lines in the U phase, V phase, and W phase are spaced out by <NUM> stator slots in the circumferential direction. Specifically, using the first line as an example, the first lead-out line U1A of the U phase, the first lead-out line V1A of the V phase, and the first lead-out line W1A of the W phase are spaced out by <NUM> slots at intervals in the circumferential direction. For example, as shown in <FIG>, U1A is led in from layer f of slot <NUM>, V1A is led in from layer f of slot <NUM>, and W1A is led in from layer f of slot <NUM>. Similarly, the second lines U2A, V2A, and W2A are led in from layer f of slot <NUM>, layer f of slot <NUM>, and layer f of slot <NUM> respectively, and are spaced out by <NUM> stator slots at intervals.

The winding coil structure may be wound by using the following winding method. As shown in <FIG> and <FIG>, using the first line of the U phase as an example, the winding route is as follows:
1f→43f→1e→7d→13c→19b→25a→19a→13b→7c→1d→43e→37f→31f→<NUM>7e→43d→1c→7b→13a→7a→1b→43c→37d→31e→25f→19f→25e→31d→37c→43b→1a→ 43a→37b→31c→25d→19e→13f→7f→13e→19d→25c→31b→37a→31a→25b→19c→13d→ 7e.

When winding is performed by using the above coil winding method, multiple first U-shaped conductor segments <NUM>, multiple second U-shaped conductor segments <NUM>, multiple third U-shaped conductor segments <NUM>, and multiple fourth U-shaped conductor segments <NUM> are applied. Still using the first line of the U phase as an example, referring to <FIG> and the above winding route, the winding is specifically as follows: The lead-out line U1A is led into the radial outermost slot layer 1f of the first slot (initial slot) on the welding end, and is connected to the first intra-slot part of the first U-shaped conductor segment <NUM>. The first U-shaped conductor segment <NUM> spans <NUM> stator slots on the same layer in the reverse direction to reach 43f, where the forward direction is a rotation direction of the motor rotor, and the reverse direction is a reverse direction of the rotation direction of the motor rotor.

Multiple second U-shaped conductor segments <NUM> span the stator slots in the forward direction and are connected in sequence, and each second U-shaped conductor segment <NUM> spans <NUM> stator slots. The slot layer of the second intra-slot part of each second U-shaped conductor segment <NUM> is more inward in the radial direction than the slot layer of the first intra-slot part by one layer until the second intra-slot part is located in the radially innermost slot layer. That is, one second U-shaped conductor segment <NUM> spans from 43f to 1e, a next second U-shaped conductor segment <NUM> spans from 1e to 7d, and so on, until reaching the radially innermost layer 25a of the <NUM>th slot.

One third U-shaped conductor segment <NUM> spans <NUM> stator slots on the same layer in the reverse direction to reach 19a.

Multiple fourth U-shaped conductor segments <NUM> span the stator slots in the reverse direction and are connected in sequence, and each fourth U-shaped conductor segment <NUM> spans <NUM> stator slots. The slot layer of the second intra-slot part of each fourth U-shaped conductor segment <NUM> is more outward in the radial direction than the slot layer of the first intra-slot part by one layer until the second intra-slot part is located in the radially outermost slot layer. That is, one fourth U-shaped conductor segment <NUM> spans from 19a to 13b, a next fourth U-shaped conductor segment <NUM> spans from 13b to 7c, and so on, until reaching the radially outermost layer 37f of the <NUM>th slot.

Then the foregoing settings are repeated by using the first U-shaped conductor segment <NUM>, the second U-shaped conductor segment <NUM>, the third U-shaped conductor segment <NUM>, and the fourth U-shaped conductor segment <NUM> until the second intra-slot part of a fourth U-shaped conductor segment <NUM> reaches an adjacent layer (that is, the sub-outermost slot layer 7e) of the radial outermost slot layer of the <NUM>th slot (end slot) and is connected to the star point line U1B of this line in this phase, where the <NUM>th slot (end slot) is spaced apart from the initial slot by <NUM> stator slots in the forward direction.

In some embodiments, for a stator assembly applicable to an <NUM>-pole <NUM>-slot <NUM>-phase motor, an initial stator assembly <NUM> may be processed into a two-line solution or a one-line solution.

When a user chooses a two-line solution, the first star point lines U1B, V1B, and W1B and the second star point lines U2B, V2B, and W2B of the U phase, the V phase, and the W phase bend outward, and are welded and connected through the neutral line <NUM>. As shown in <FIG>, finally, the first lead-out lines U1A, V1A, and W1A and the second lead-out lines U2A, V2A, and W2A of the U phase, the V phase, and the W phase are welded through a welding terminal before being connected to an external controller interface.

When the user chooses a one-line solution, the second lead-out lines U2A, V2A, and W2A of the U phase, the V phase, and the W phase are stretched and bent, and then welded to the first star point lines U1B, V1B, and W1B of the U phase, the V phase, and the W phase respectively. The second star point lines U2B, V2B, and W2B bend outward and are welded and connected through the neutral line <NUM>. Finally, the first lead-out lines U1A, V1A, and W1A of the U phase, the V phase, and the W phase are connected to the external controller interface after being welded together through a welding terminal.

Of course, depending on the number of stator slots, the number of poles, and the number of phases, the winding structure of each phase and each line varies.

For example, the number of stator slots is <NUM>, the number of poles is <NUM>, and the number of phases is <NUM>, the three phases U phase, V phase, and W phase are included, and each phase includes three lines (not shown in the drawing), where each star point line of the U phase is spaced apart from the lead-out line by <NUM> stator slots <NUM>, and every two of the three lines of the U phase are spaced out by <NUM> stator slot <NUM> in the circumferential direction; every two of the three lines of the V phase are spaced out by <NUM> stator slot <NUM> in the circumferential direction, every two of the three lines of the W phase are spaced out by <NUM> stator slot <NUM> in the circumferential direction, the corresponding star point lines of the U phase, the V phase, and the W phase are spaced out by <NUM> stator slots <NUM> in the circumferential direction, and the corresponding lead-out lines of the U phase, the V phase, and the W phase are spaced out by <NUM> stator slots <NUM> in the circumferential direction.

It is worth noting that, in some exemplary embodiments, at the welding end II of the coil winding, the star point lines of each line in any phase are located in the outermost layer in the radial direction, and the lead-out lines of each line in any phase are located in the sub-outermost layer in the radial direction. This facilitates the lead-in of the lead-out lines and the lead-out of the star point lines, and simplifies the structure of the entire coil winding.

In conclusion, based on the above winding method, the stator assembly <NUM> according to the embodiment of the present disclosure has welding points on only the welding end, and has no welding terminals on the hairpin end. The welding process is simple and convenient, the types of coils required for winding are few, and the devices required are few, so that it is easy to implement mass production. In addition, by using this winding method, the voltage difference of flat lines between adjacent slot layers in the same slot is smaller than that of the related art, thereby effectively reducing risks of motor insulation breakdown and achieving high reliability. In addition, it is easy to adjust the number of lines of the winding.

Claim 1:
A stator assembly (<NUM>), comprising:
a cylindrical stator core (<NUM>), wherein multiple stator slots spaced out along a circumferential direction of the stator core (<NUM>) exist on the stator core (<NUM>); and
a stator winding (<NUM>), wherein the stator winding (<NUM>) comprises multiple conductor segments (<NUM>), each of the conductor segments (<NUM>) comprises an intra-slot part (<NUM>, <NUM>) disposed in a stator slot of the stator core (<NUM>), a first end and a second end that are disposed outside the stator core (<NUM>), the intra-slot part (<NUM>, <NUM>) is connected between the first end and the second end, the second end of each of the multiple conductor segments (<NUM>) forms a welding end (<NUM>), and a lead-out line (<NUM>) from each phase of the stator winding (<NUM>) is located at the welding end (<NUM>),
wherein the stator winding (<NUM>) includes at least one phase, said at least one phase including a star point line (<NUM>), and wherein all star point lines (<NUM>) of each phase of the stator winding (<NUM>) are located at the welding end (<NUM>);
the stator assembly (<NUM>) further comprises a neutral line (<NUM>), and the neutral line (<NUM>) is connected to each of the star point lines (<NUM>),
wherein the neutral line (<NUM>) forms a shape of an arc segment; characterized in that
the star point lines (<NUM>) of the stator winding (<NUM>) are indirectly connected to the neutral line (<NUM>) through at least one connection block (<NUM>).