Hybrid winding motor

Abstract

The invention discloses a hybrid winding motor, which comprises a shell and a stator, the stator comprises a stator iron core and two groups of three-phase windings wound on the stator iron core, each phase winding comprises two coil rings arranged at adjacent magnetic pole positions, each coil ring comprises P coil groups uniformly distributed along the circumferential direction, and P is the number of pole pairs; each coil assembly comprises two supporting legs which are bent in opposite directions in the circumferential direction, the supporting legs of the P coil assemblies are sequentially connected in series in the circumferential direction to form the coil ring, and the end supporting leg of at least one coil ring is a power source supporting leg used for being connected with a power source; and in the two groups of three-phase windings, the power supply supporting feet of the two phase windings positioned on the adjacent slot positions in the circumferential direction are arranged at an interval of 180 degrees in the circumferential direction. The device has the advantages of being reasonable in structural design, few in hairpin type, low in cost, beneficial to reducing the assembling difficulty, improving the assembling efficiency and the assembling quality and the like.

Description

Technical Field

[0001] The invention relates to the technical field of flat wire motors, and in particular to a hybrid winding motor. Background Art

[0002] In recent years, miniaturization and high speed have become the main development trends of new energy electric vehicle motors. Compared with traditional permanent magnet motors, flat wire motors have the characteristics of high copper full rate in their windings, which can greatly improve the torque density and power density of the motors. The winding ends of flat wire motors are relatively short, which can further improve the utilization rate of vehicle space. The larger contact area between the wires effectively enhances the heat dissipation capacity of the motor. Therefore, flat wire motors have good application prospects in new energy electric vehicles.

[0003] Compared with three-phase motors, six-phase motors can offset specific order harmonics, reduce torque pulsation, and improve motor NVH performance; as the number of motor phases increases, the motor fault tolerance is enhanced and the working reliability is higher. The winding structure in the prior art requires a variety of special shapes and conductors with a variety of long spans or short spans to achieve cross-connection between hairpin conductor layers, resulting in a wide variety of hairpin conductors, increasing assembly difficulty and cost. Summary of the invention

[0004] In view of the above-mentioned deficiencies of the prior art, the technical problem to be solved by the present invention is: how to provide a hybrid winding motor with reasonable structural design, fewer types of card issuance, low cost, which is conducive to reducing assembly difficulty and improving assembly efficiency and assembly quality.

[0005] In order to solve the above technical problems, the present invention adopts the following technical solutions: A hybrid winding motor comprises a housing and a stator, wherein the stator comprises a stator core and two groups of three-phase windings wound on the stator core, wherein each phase of the phase winding comprises two coil rings arranged at adjacent magnetic pole positions, wherein the coil ring comprises P coil groups evenly distributed along the circumferential direction, where P is the number of pole pairs; the coil group comprises two legs deflected and bent in opposite directions in the circumferential direction, wherein the legs of the P coil groups are sequentially connected in series along the circumferential direction to form the coil ring, and an end leg of at least one of the coil rings is a power leg for connecting a power supply; in the two groups of the three-phase windings, the power legs of the two phase windings located at adjacent circumferential slots are arranged 180° apart in the circumferential direction.

[0006] The two sets of phase windings formed by the above structure make the electrical angle between each phase differ by 60 degrees. It can be operated with either single winding or double winding. The motor has a wider high-efficiency area, and the heat generation of the whole machine is greatly reduced, which makes the harmonic component lower and the noise reduced. Moreover, each coil ring is composed of a uniformly distributed coil group. The type of hairpin in the coil group directly determines the type of hairpin used in the entire winding, thereby avoiding special-shaped hairpins, with fewer types of hairpins and lower production costs, which is conducive to reducing assembly difficulty, improving assembly efficiency and assembly quality.

[0007] Furthermore, the coil group includes a first hairpin and a second hairpin with the same pitch arranged at the same magnetic pole position, the first hairpin and the second hairpin both include a hairpin body that is bent in a U-shape as a whole, the hairpin body includes two leg portions arranged parallel to each other and a head connected to one end of the two leg portions, and the other end of the two leg portions is a connecting section; the two connecting sections of the first hairpin deflect and bend in the clockwise or counterclockwise direction of the phase winding, the two connecting sections of the second hairpin deflect and bend in the counterclockwise or clockwise direction of the phase winding, the connecting sections on the first hairpin and the second hairpin that are deflected in opposite directions form the supporting feet, and the other two connecting sections are connected in series to form the coil group.

[0008] Furthermore, the two leg portions of the first hairpin are respectively located at the second and third layers in the radial direction of the phase winding, and the two leg portions of the second hairpin are respectively located at the first and fourth layers in the radial direction of the phase winding.

[0009] Furthermore, the coil group also includes a third hairpin arranged side by side with the first hairpin, and the pitches of the first hairpin, the second hairpin and the third hairpin are the same; the third hairpin includes a hairpin body bent in a U-shape, the hairpin body includes two leg portions arranged parallel to each other and a head connected to one end of the two leg portions, the other ends of the two leg portions are bent toward the middle in the width direction of the hairpin body to form a connecting section, and the two connecting sections of the third hairpin are respectively welded to two connecting sections close to each other on the two hairpin conductors.

[0010] Furthermore, the two legs of the first hairpin and the third hairpin are respectively located at the Nth and N+1th layers in the radial direction of the phase winding, where N is an even number, and the two legs of the second hairpin are respectively located at the innermost and outermost layers in the radial direction of the phase winding.

[0011] Furthermore, the pitch of the card issuing body is Y or Y-1, where Y is the pole pitch.

[0012] A stator assembly comprises a stator core and the hybrid winding motor as described above, wherein the hybrid winding motor is mounted on the stator core.

[0013] In summary, the hybrid winding motor of the present invention has the advantages of reasonable structural design, fewer types of card issuance, low cost, and is conducive to reducing assembly difficulty and improving assembly efficiency and assembly quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic diagram of the overall structure of this embodiment.

[0015] Figure 2 This is a schematic diagram of the overall structure of the second hairpin with a portion hidden in this embodiment.

[0016] Figure 3 for Figure 2 Schematic diagram of the partial top view structure.

[0017] Figure 4 It is a schematic diagram of the structure of the phase windings on two adjacent slots.

[0018] Figure 5 and Figure 6 Schematic diagram of the overall structure of the coil ring. DETAILED DESCRIPTION

[0019] The present invention is further described in detail below in conjunction with embodiments.

[0020] When implementing: Figure 1 to Figure 6 As shown, a hybrid winding motor includes a stator assembly, wherein the stator assembly includes a stator core 1 and two sets of three-phase windings, wherein the stator core 1 includes a main body which is generally cylindrical, and a plurality of stator core slots which are radially open inward are circumferentially arranged on the inner ring of the stator core 1, wherein the lower end of the stator core slot is an insertion side (or crown side), and the upper end is a connection side.

[0021] In this embodiment, each phase winding 2 includes two coil rings 3 arranged at adjacent magnetic pole positions, and the coil ring 3 includes P coil groups 4 uniformly distributed along the circumferential direction, where P is the number of pole pairs; in this embodiment, the number of pole pairs P=8, and the coil group 4 includes two legs that are bent in opposite directions in the circumferential direction, and the legs of the P coil groups 4 are connected in series in sequence along the circumferential direction to form the coil ring 3, and at least one end leg of the coil ring 3 is a power leg for connecting a power supply; in the two groups of the three-phase windings, the power legs of the two phase windings 2 located at adjacent slots in the circumferential direction are arranged 180° apart in the circumferential direction, such as Figure 4 shown.

[0022] In this embodiment, Figure 5 and Figure 6As shown, the coil group 4 includes a first hairpin 5, a second hairpin 6 and a third hairpin 7 which are arranged at the same magnetic pole position and have the same pitch. The first hairpin 5, the second hairpin 6 and the third hairpin 7 all include a hairpin body which is bent in a U shape as a whole. The hairpin body includes two leg parts which are arranged parallel to each other and a head connected to one end of the two leg parts, and the other end of the two leg parts is a connecting section.

[0023] Seen from the connection side, the two connection sections of the first hairpin 5 are deflected and bent in the counterclockwise direction of the phase winding 2, and the two connection sections of the second hairpin 6 are deflected and bent in the clockwise direction of the phase winding 2; the two connection sections of the third hairpin 7 are deflected and bent toward the middle in the width direction of the hairpin body, and are respectively welded and connected to the connection sections on the first hairpin 5 and the second hairpin 6 that are deflected toward the middle of the hairpin active part, to form the coil group 4.

[0024] In this embodiment, the pitch and pole pitch of the first hairpin 5, the second hairpin 6 and the third hairpin 7 are all 6, the two leg portions of the first hairpin 5 and the third hairpin 7 are respectively located at the Nth layer and the N+1th layer in the radial direction of the phase winding 2, N is an even number, and the two leg portions of the second hairpin 6 are respectively located at the innermost layer and the outermost layer in the radial direction of the phase winding 2. In this embodiment, the two leg portions of the first hairpin 5 are located at the 2nd and 3rd layers of the phase winding 2, the two leg portions of the third hairpin 7 are located at the 4th and 5th layers of the phase winding 2, and the two leg portions of the second hairpin 6 are located at the 1st and 6th layers of the phase winding 2.

[0025] In the above structure, the first hairpin 5 and the third hairpin 7 have the same pitch, and the two leg portions are located on two adjacent layers (2nd and 3rd layers or 4th and 5th layers) of the phase winding 2, so that the first hairpin 5 and the third hairpin 7 can be formed by the same mold, and the assembled first hairpin 5 and the third hairpin 7 form a concentric ring in the stator core, such as Figure 2 and Figure 3 As shown, the second issuing card 6 is arranged outside the first issuing card 5 and the second issuing card 6 .

[0026] Specifically, in the same phase winding 2, the two end legs on the coil ring 3 are respectively a power leg for connecting to a power source and a star leg for connecting to a star point. The power legs and the star legs on the two coil rings 3 are both located in the same radial direction, and the two power legs are located on two adjacent layers and are connected to power terminals (not shown in the figure); the two star legs are located on the inner and outer sides of the two power legs, respectively. The star legs on the same three-phase winding are connected by welding through star terminals 8.

[0027] The two sets of three-phase windings in this embodiment make the electrical angles of each phase differ by 60 degrees, and can be operated with either a single winding or a double winding. The motor has a wider high-efficiency area, and the heat generated by the whole machine is greatly reduced, so that the harmonic components are lower and the noise is reduced. Moreover, each coil ring 3 is composed of a uniformly distributed coil group 4. The type of hairpin in the coil group 4 directly determines the type of hairpin used in the entire winding, so that special-shaped hairpins can be avoided, the types of hairpins are fewer, and the production cost is lower, which is conducive to reducing the difficulty of assembly and improving assembly efficiency and assembly quality.

[0028] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A hybrid winding motor, comprising a housing and a stator, wherein the stator comprises a stator core and two sets of three-phase windings wound on the stator core, characterized in that: Each phase winding includes two coil rings arranged at adjacent magnetic pole positions, and the coil ring includes P coil groups evenly distributed along the circumferential direction, where P is the number of pole pairs; the coil group includes two legs that are deflected and bent in opposite directions in the circumferential direction, and the legs of the P coil groups are connected in series in sequence along the circumferential direction to form the coil ring, and the end legs of at least one of the coil rings are power legs for connecting to a power supply; in the two groups of three-phase windings, the power legs of the two phase windings located at adjacent slots in the circumferential direction are arranged 180° apart in the circumferential direction.

2. The hybrid winding motor according to claim 1, characterized in that: The coil group includes a first hairpin and a second hairpin with the same pitch arranged at the same magnetic pole position, the first hairpin and the second hairpin both include 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, and the other ends of the two leg parts are connecting sections; the two connecting sections of the first hairpin deflect and bend in the clockwise or counterclockwise direction of the phase winding, the two connecting sections of the second hairpin deflect and bend in the counterclockwise or clockwise direction of the phase winding, the connecting sections on the first hairpin and the second hairpin that are deflected in opposite directions form the supporting feet, and the other two connecting sections are connected in series to form the coil group.

3. The hybrid winding motor according to claim 2, characterized in that: The two legs of the first hairpin are respectively located at the second and third layers in the radial direction of the phase winding, and the two legs of the second hairpin are respectively located at the first and fourth layers in the radial direction of the phase winding.

4. The hybrid winding motor according to claim 2, characterized in that: The coil group also includes a third hairpin arranged side by side with the first hairpin, and the pitches of the first hairpin, the second hairpin and the third hairpin are the same; the third hairpin 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 bent toward the middle in the width direction of the hairpin body to form a connecting section, and the two connecting sections of the third hairpin are respectively welded to two connecting sections close to each other on the two hairpin conductors.

5. The hybrid winding motor according to claim 4, characterized in that: At least two third hair clips are arranged side by side in the radial direction of the phase winding, and the first hair clips and the third hair clips are connected in series in sequence.

6. The hybrid winding motor according to claim 4, characterized in that: The two legs of the first hairpin and the third hairpin are respectively located at the Nth and N+1th layers in the radial direction of the phase winding, where N is an even number, and the two legs of the second hairpin are respectively located at the innermost and outermost layers in the radial direction of the phase winding.

7. The hybrid winding motor according to any one of claims 2 to 6, characterized in that: The pitch of the card issuing body is Y or Y-1, where Y is the pole pitch.

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