Motor phase winding structure and stator assembly

Abstract

The utility model discloses a motor phase winding structure and a stator assembly, the motor phase winding structure comprises at least one branch circuit, each branch circuit is formed by connecting at least one group of coil rings located in the same annular area, each group of coil rings comprises two coil rings which are arranged in a staggered manner at the position of one magnetic pole in the circumferential direction, the coil ring comprises P single coils which are uniformly distributed along the circumferential direction; each single coil comprises two supporting feet which are bent in opposite directions in the circumferential direction, the supporting feet are sequentially connected in series in the circumferential direction to form a coil ring, and the supporting feet located at the two ends of the coil ring form connecting feet; and in the group of coil rings positioned on the innermost layer or the outermost layer on the same branch, the connecting pin positioned on the innermost layer or the outermost layer on one coil ring is reversely deflected and bent, and is welded and connected with the connecting pin positioned on the innermost layer or the outermost layer on the other coil ring side by side. The motor phase winding structure and the stator assembly have the advantages of being reasonable in structural design, few in hairpin type, low in cost, beneficial to reducing assembly difficulty, improving assembly efficiency and assembly quality and the like.

Description

Technical Field

[0001] The utility model relates to the technical field of motors, and particularly relates to a phase winding structure of a motor and a stator assembly. Background Art

[0002] A motor is a device that converts electrical energy into mechanical energy according to the principle of electromagnetic induction, and can be used as a power source or a power generation device for various electrical appliances such as household appliances, and various machines such as electric vehicles and electric cars. Motors can be divided into DC motors and AC motors according to the type of their working power supply, and AC motors can be further divided into single-phase motors and polyphase motors. A motor includes a stator and a rotor, and windings are arranged in the stator core slots of the stator. The existing motor winding forms are wave windings and lap windings. For a segmented hairpin winding motor using flat copper wires or copper wires with a rectangular cross-section, using a lap winding will cause too many bridging conductors between the lap coils, increasing the usage of ineffective copper. Therefore, this type of motor usually uses a wave winding.

[0003] The prior art usually adopts a multi-layer wave winding. This winding structure requires various special shapes and conductors with various long spans or short spans to achieve the bridging between the hairpin conductor layers, resulting in a large variety of hairpin conductors, increasing the assembly difficulty and cost. Summary of the Utility Model

[0004] Aiming at the deficiencies of the above-mentioned prior art, the technical problem to be solved by the utility model is: how to provide a motor phase winding structure and a stator assembly with reasonable structural design, few hairpin types, low cost, which is beneficial to reducing the assembly difficulty, improving the assembly efficiency and assembly quality.

[0005] To solve the above technical problems, the utility model adopts the following technical solutions:

[0006] A motor phase winding structure includes at least one branch. The feature is that each branch is formed by connecting at least one group of coil rings located in the same annular region. Each group of the coil rings includes two coil rings arranged with a circumferential misalignment of one pole position. The coil ring includes P monomer coils evenly distributed along the circumference, where P is the number of pole pairs; each monomer coil includes two legs that are bent and turned in opposite circumferential directions. The legs of the P monomer coils are sequentially connected in series along the circumference to form the coil ring, and the legs located at both ends of the coil ring form connection legs; in a group of the coil rings located in the innermost or outermost layer on the same branch, the connection leg located at the innermost or outermost side of one coil ring is bent and turned in the reverse direction and is welded side by side to the connection leg located at the innermost or outermost side of the other coil ring.

[0007] In the above structure, the innermost or outermost connecting leg on a coil loop is reversely deflected and bent to the connecting leg of another coil loop and welded side by side, so that the two can be connected in series without additional jumpers. In the assembled state, only the connecting leg that needs to be reversely bent needs to be deflected outwards by one layer and then reversely bent, which is convenient for subsequent automated welding operations, thereby improving the assembly efficiency and assembly quality.

[0008] Further, at least two layers of the coil loops are arranged side by side in the radial direction, and any one of the coil loops is welded and connected to the coil loop at the corresponding magnetic pole position on the adjacent layer through the connecting legs arranged side by side in the radial direction. The connecting legs are located at the Nth layer and the (N + 1)th layer of the winding, and N is an even number.

[0009] In this way, the coil loops of adjacent two layers are welded and connected through the connecting legs at the Nth layer and the (N + 1)th layer of the winding, so that the series connection of the coil loops of adjacent two layers can be realized without jumpers.

[0010] Further, Q groups of the coil loops are arranged on Q adjacent slot positions in the circumferential direction. In any group of the innermost or outermost coil loops on the same branch, the innermost or outermost connecting leg on one of the coil loops is reversely deflected and bent and welded side by side with the innermost or outermost connecting leg on another coil loop in the same group.

[0011] Further, the single coil includes a hairpin conductor. The hairpin conductor includes a hairpin main body bent in an overall U shape. The hairpin main body includes two leg portions arranged in parallel with each other and a head connected to one ends of the two leg portions. The other ends of the two leg portions are deflected and bent in opposite directions along the width direction of the hairpin main body to form the leg feet.

[0012] Further, the single coil includes two hairpin conductors arranged side by side in the thickness direction. The hairpin conductor includes a hairpin main body bent in an overall U shape. The hairpin main body includes two leg portions arranged in parallel with each other and a head connected to one ends of the two leg portions. The other ends of the two leg portions are connecting segments. The connecting segments on the two hairpin conductors are deflected and bent in opposite directions in the width direction of the hairpin main body. Among them, the two connecting segments are close to each other and welded and connected, and the other two connecting segments are deflected in opposite directions to form the leg feet.

[0013] Further, the monomer coil further includes an O-shaped conductor arranged side by side with the hairpin conductor in the thickness direction. The O-shaped conductor includes a hairpin body bent in a U shape. The hairpin body includes two leg portions arranged parallel to each other and a head portion connected to one ends of the two leg portions. The other ends of the two leg portions deflect towards the middle in the width direction of the hairpin body to form connecting segments. The two connecting segments of the O-shaped conductor are respectively welded and connected to two adjacent connecting segments on the two hairpin conductors.

[0014] Further, the pitch of the hairpin conductor is a full pitch.

[0015] Further, Q is an integer greater than 1. One of the connecting feet located on the outermost or innermost side in the Q-1 groups of coil rings adjacent in the circumferential direction is reversely deflected and bent, and is welded and arranged side by side with the connecting foot on another group of coil rings in an adjacent slot in the circumferential direction.

[0016] In this way, Q groups of coil rings can be connected in series into a branch without the need to additionally arrange jumpers.

[0017] A stator assembly, characterized by comprising a stator core and the motor phase winding structure as described above, and the motor phase winding structure is installed on the stator core.

[0018] In summary, the motor phase winding structure and the stator assembly of the present invention both have the advantages of reasonable structural design, few types of hairpins, low cost, being beneficial to reducing the assembly difficulty, and improving the assembly efficiency and assembly quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the overall structure of Embodiment 1.

[0020] Figure 2 It is a schematic diagram of the structure of a group of coil rings in Embodiment 1.

[0021] Figure 3 and Figure 4 is Figure 2 a schematic diagram of the structure of two coil rings in

[0022] Figure 5 It is a schematic diagram of the structure of a group of coil rings arranged concentrically in two layers.

[0023] Figure 6 It is a schematic diagram of the structure of the phase winding in Embodiment 1.

[0024] Figure 7 is Figure 6 a schematic diagram of the connection of two groups of coil rings in the outer layer in

[0025] Figure 8 It is a schematic diagram of Embodiment 2.

[0026] Figure 9 It is a schematic enlarged structure diagram at the circled part in Embodiment 2.

[0027] Figures 10 to 12 It is a schematic structure diagram of the hairpin conductor in Embodiment 3. Specific Embodiments

[0028] The following further elaborates on the present utility model in conjunction with embodiments.

[0029] Embodiment 1: A motor, as Figure 1 shown, includes a stator assembly. The stator assembly includes a stator core 1 and three-phase phase windings 2 mounted on the stator core 1. The stator core 1 includes a main body that is integrally cylindrical. Along the circumferential direction of the inner circle of the stator core 8, a plurality of stator core slots opening radially inward are provided. The lower end of the stator core slot is the insertion side (or crown side), and the upper end is the connection side.

[0030] In this embodiment, as Figures 2 to 4 shown, the number of slots per pole per phase Q = 2, and the number of pole pairs P = 4. Each branch of the phase winding 2 is formed by connecting a set of coil rings 3 located in the same annular region. Each set of the coil rings 3 includes two coil rings 4 arranged with a circumferential displacement of one pole position. The coil ring 4 includes 4 monomer coils 5 evenly distributed along the circumferential direction; the monomer coil 5 includes two legs 6 that are bent and turned in opposite circumferential directions. The legs 6 of the 4 monomer coils 5 are sequentially connected in series along the circumferential direction to form the coil ring 4, and the legs 4 at both ends of the coil ring 4 form connection legs 7; in the outermost set of the coil rings 3 on the same branch, one of the coil rings 4 ( Figure 2 shown by the solid line in Figure 3 and Figure 2 shown by the solid line in Figure 4 ), the outermost connection leg 7 on it is offset outward by one layer and reversely bent and turned to be welded side by side with the outermost connection leg 7 on another coil ring 4 ( Figure 2 In, the 1 connection leg 7 marked by the solid line is reversely bent and turned to the outside of the connection leg 7 marked by the dotted line, and is welded side by side with the connection leg 7 marked by the dotted line after being side by side.

[0031] In this embodiment, the monomer coil 5 includes a hairpin conductor. The hairpin conductor includes a hairpin main body that is integrally U-shaped bent. The hairpin main body includes two leg parts 51 arranged in parallel with each other and a head 52 connected to one end of the two leg parts 51. The other ends of the two leg parts 51 are bent and turned in opposite directions along the width direction of the hairpin main body to form the legs 6. The pitch of the hairpin conductor is a full pitch.

[0032] AsFigure 5 As shown, the coil ring group 3 is arranged in two layers side by side in the radial direction. Any one of the coil rings 4 is welded and connected to the coil ring 4 at the corresponding magnetic pole position on the adjacent layer through the radially side-by-side connecting legs 7. The connecting legs 7 are located at the Nth layer and the (N + 1)th layer of the winding, and N is an even number. In this embodiment, each stator core slot has 4 leg portions, and the connecting legs are located at the 2nd layer and the 3rd layer of the winding.

[0033] Specifically, since Q = 2, that is, the coil ring group 3 is arranged in 2 groups at two adjacent slot positions in the circumferential direction, as Figure 6 shown. In this embodiment, the coil rings on the upper two slot positions are respectively connected to form a branch, forming a two-branch phase winding. In any one of the outermost coil ring groups 3 on the same branch, the connecting leg 7 on the outer side of one coil ring 4 is reversely deflected and bent, and is welded side by side to the outermost connecting leg 7 on another coil ring 4 in the same group. As Figure 7 shown. On the two outermost coil ring groups 3, each has a connecting leg 7 on the outer side that is reversely deflected and bent, and is welded side by side to the outermost connecting leg 7 on another coil ring 4 in the same group.

[0034] In this embodiment, the innermost or outermost connecting leg of a coil ring is reversely deflected and bent to the connecting leg of another coil ring and welded side by side, so that the two can be connected in series without additional jumpers. In the assembled state, only the connecting leg that needs to be reversely bent needs to be deflected outward by one layer and then reversely bent, which is convenient for subsequent automated welding operations, thereby improving the assembly efficiency and improving the assembly quality.

[0035] Embodiment 2: The main difference from Embodiment 1 is that this embodiment has one branch. The specific structure is based on Embodiment 1 with Q = 2. The innermost connecting leg in one of the circumferentially adjacent coil ring groups 3 is reversely deflected and bent, and is welded side by side to the connecting leg on another coil ring 4 in a circumferentially adjacent slot position. As Figure 8 and Figure 9 shown, the connecting leg 73 is reversely deflected and bent to the position 72 side by side with the connecting leg 71. In this way, the 2 groups of coil rings can be connected in series to form a branch without the need to additionally set jumpers.

[0036] Embodiment 3: The main difference between this embodiment and Embodiment 1 lies in the different structures of the monomer coils. Specifically, the monomer coil includes two hairpin conductors arranged side by side in the thickness direction. The hairpin conductor includes a hairpin body integrally bent in a U shape. The hairpin body includes two leg portions 51 arranged parallel to each other and a head portion 52 connected to one end of the two leg portions 51. The other ends of the two leg portions 51 are connection segments 53. The connection segments 53 on the two hairpin conductors are deflected and bent in opposite directions in the width direction of the hairpin body, as Figure 10 and Figure 11 shown, where the two connection segments 53 are close to each other and welded together, and the other two connection segments 53 are deflected in opposite directions to form the legs.

[0037] The monomer coil further includes an O-shaped conductor arranged side by side with the hairpin conductor in the thickness direction. The O-shaped conductor includes a hairpin body bent in a U shape. The hairpin body includes two leg portions 51 arranged parallel to each other and a head portion 52 connected to one end of the two leg portions. The other ends of the two leg portions 51 are deflected towards the middle in the width direction of the hairpin body to complete the formation of the connection segments 53, as Figure 12 shown. The two connection segments of the O-shaped conductor are respectively welded to the two connection segments close to each other on the two hairpin conductors.

[0038] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, and improvements made within the spirit and principles of the present invention shall be included in the protection scope of the present invention.

Claims

1. A motor phase winding structure, comprising at least one branch, characterized in that: Each branch is formed by connecting at least one group of coil ring groups located in the same annular area, each group of the coil ring groups includes two coil rings arranged with one magnetic pole position offset in the circumferential direction, and the coil ring includes P single coils evenly distributed in the circumferential direction, P is the number of pole pairs; the single coil includes two legs deflected and bent in opposite directions in the circumferential direction, the legs of the P single coils are connected in series in sequence along the circumferential direction to form the coil ring, and the legs located at both ends of the coil ring form connecting legs; in a group of the coil ring groups located in the innermost or outermost layer on the same branch, the innermost or outermost connecting leg on one of the coil rings is deflected and bent in the opposite direction, and is welded side by side with the innermost or outermost connecting leg on the other coil ring.

2. The motor phase winding structure according to claim 1, characterized in that: The coil ring group is radially arranged in at least two layers side by side, and any coil ring is welded to the coil ring at the corresponding magnetic pole position on the adjacent layer through radially parallel connecting pins, and the connecting pins are located at the Nth layer and the N+1th layer of the winding, where N is an even number.

3. The motor phase winding structure according to claim 1 or 2, characterized in that: The coil ring group is provided with Q groups on Q adjacent slots in the circumferential direction. In any group of the coil ring groups located in the innermost or outermost layer on the same branch, the innermost or outermost connecting pin on one of the coil rings is deflected and bent in the opposite direction, and is welded side by side with the innermost or outermost connecting pin on another coil ring in the same group.

4. The motor phase winding structure according to claim 3, characterized in that: The single coil includes a hairpin conductor, which includes a hairpin body that is bent in a U-shape as a whole. The hairpin body includes two legs arranged parallel to each other and a head connected to one end of the two legs. The other ends of the two legs are bent in opposite directions along the width direction of the hairpin body to form the legs.

5. The motor phase winding structure according to claim 3, characterized in that: The single coil includes two hairpin conductors arranged side by side in the thickness direction, the hairpin conductor includes a hairpin body that is bent in a U-shape as a whole, the hairpin body includes two leg parts arranged parallel to each other and a head connected to one end of the two leg parts, the other ends of the two leg parts are connecting sections, and the connecting sections on the two hairpin conductors are bent in opposite directions in the width direction of the hairpin body, wherein two connecting sections are close to each other and welded together, and the other two connecting sections are deflected in opposite directions to form the supporting feet.

6. The motor phase winding structure according to claim 5, characterized in that: The single coil also includes an O-shaped conductor arranged side by side with the hairpin conductor in the thickness direction, the O-shaped conductor includes a hairpin body bent in a U shape, the hairpin body includes two leg parts arranged parallel to each other and a head connected to one end of the two leg parts, the other ends of the two leg parts are deflected toward the middle in the width direction of the hairpin body to form a connecting section, and the two connecting sections of the O-shaped conductor are respectively welded to two connecting sections close to each other on the two hairpin conductors.

7. The motor phase winding structure according to any one of claims 4 to 6, characterized in that: The pitch of the hairpin conductor is an integral pitch.

8. The motor phase winding structure according to claim 3, characterized in that: Q is an integer greater than 1, and a connecting foot located at the outermost or innermost side of the circumferentially adjacent Q-1 group of coil rings is reversely deflected and bent, and is welded side by side with a connecting foot on another group of coil rings in a circumferentially adjacent slot.

9. A stator assembly, characterized in that: The invention comprises a stator core and a motor phase winding structure according to any one of claims 1 to 8, wherein the motor phase winding structure is mounted on the stator core.

Images