Motor stator and axial flux motor

Abstract

The utility model discloses a motor stator and an axial magnetic flux motor, and relates to the technical field of motor equipment, the motor stator and the axial magnetic flux motor comprise a stator iron core and a stator winding, the stator iron core comprises a plurality of iron cores, the plurality of iron cores are annularly arranged, and an interval is arranged between two adjacent iron cores; the stator winding is wound on each iron core, the stator winding comprises a plurality of layers of three-phase hairpin coils, each three-phase hairpin coil is composed of three single-phase hairpin coils which are connected in parallel, the single-phase hairpin coils of each layer of three-phase hairpin coils are connected in series in a one-to-one correspondence mode, and each single-phase hairpin coil of each layer of three-phase hairpin coils is of an integrated structure. The one-way hairpin coil of the motor stator disclosed by the utility model is of an integrated structure which is pre-assembled and molded, and can be braided into a three-phase hairpin coil before winding, and the three-phase hairpin coil can be directly wound on the stator iron core during assembly, so that the welding operation after the stator winding is assembled on the stator iron core is reduced, and the production efficiency is improved. The assembling difficulty is reduced, and the assembling efficiency can be effectively improved.

Description

Technical Field

[0001] The utility model relates to the technical field of motor equipment, and more specifically, to a motor stator and an axial flux motor. Background Art

[0002] The primary difference between flat-wire motors and round-wire motors lies in the copper wire forming method. The flat-wire design helps improve the motor's slot fill factor, meaning more copper wire can be packed into the same space, generating a stronger magnetic field and increasing power density. Therefore, in the long term, flat-wire motors are considered the future of drive motors. Traditional stator winding assembly requires inserting all the flat wires into the stator slots and then soldering them individually, a complex process.

[0003] Therefore, how to reduce the complexity and difficulty of stator winding assembly to improve assembly efficiency has become a technical problem that needs to be urgently solved by those skilled in the art. Utility Model Content

[0004] In view of this, an object of the present invention is to provide a motor stator to improve the assembly efficiency of the stator winding.

[0005] Another object of the present invention is to provide an axial flux motor including the above-mentioned motor stator.

[0006] To achieve the above objectives, the present invention provides the following technical solutions:

[0007] A motor stator, comprising:

[0008] The stator core comprises a plurality of iron cores arranged in a ring shape, with a gap provided between two adjacent iron cores;

[0009] The stator winding is wound on each of the iron cores, and the stator winding includes multiple layers of three-phase hairpin coils. Each of the three-phase hairpin coils is composed of three parallel single-phase hairpin coils, and the single-phase hairpin coils of each layer of the three-phase hairpin coils are connected in series one by one, and each of the single-phase hairpin coils is an integrated structure.

[0010] Optionally, in the above-mentioned motor stator, the single-phase hairpin coil is an integrated structure formed by sequentially connecting a plurality of hairpin units, and the hairpin units include:

[0011] The middle section is used to be wound around the inner ring of the iron core and is provided with an arc-shaped protrusion for avoiding the adjacent single-phase hairpin coil;

[0012] The edge section consists of two sections and is used to be wound around the outer ring of the iron core and connected to the adjacent single-phase hairpin coil;

[0013] The connecting section consists of two sections and is connected one-to-one between the middle section and the edge section. The connecting section is used to be wound between two adjacent iron cores. The middle section, the edge section and the connecting section are an integrated structure.

[0014] Optionally, in the above-mentioned motor stator, a connection protrusion for connecting to an adjacent single-phase hairpin coil is provided at one end of the edge segment away from the connection segment.

[0015] Optionally, in the above-mentioned motor stator, the three single-phase hairpin coils of the three-phase hairpin coil are wound alternately with each other.

[0016] Optionally, in the above-mentioned motor stator, the single-phase hairpin coil is an integrated structure prepared by bending a copper wire; and / or,

[0017] The single-phase hairpin coil is made of flat wire.

[0018] Optionally, in the above-mentioned motor stator, the single-phase hairpin coils of two adjacent layers of the three-phase hairpin coils are connected by welding.

[0019] Optionally, in the above-mentioned motor stator, the single-phase hairpin coils of two adjacent layers of the three-phase hairpin coils are directly connected or connected in series via a first hairpin connecting line; and / or,

[0020] The end of the three-phase hairpin coil is connected to the power supply through a second hairpin connecting line.

[0021] Optionally, in the above-mentioned motor stator, the pitches of the single-phase hairpin coils include 5, 7 and 6.

[0022] Optionally, in the above-mentioned motor stator, the edges of the iron core are chamfered.

[0023] An axial flux motor comprises the motor stator described above.

[0024] The motor stator provided by the present invention includes a stator core and a stator winding. The stator core includes a plurality of cores, which are arranged in a ring shape, and a gap is set between two adjacent cores. The stator winding is wound on each core. The stator winding includes multiple layers of three-phase hairpin coils. Each three-phase hairpin coil is composed of three parallel single-phase hairpin coils. The single-phase hairpin coils of each layer of three-phase hairpin coils are connected in series one by one. The single-phase hairpin coils of each layer of three-phase hairpin coils are all integrated structures. During assembly, the single-phase hairpin coils are first pre-assembled and formed, and then assembled into three-phase hairpin coils. The three-phase hairpin coils are then installed on the core. After the three-phase hairpin coils are wound on the core, the single-phase hairpin coils in each three-phase hairpin coil are connected in series one by one to complete the assembly of the motor stator.

[0025] Compared with the existing technology, the one-way hairpin coil of the motor stator provided by the utility model is a pre-assembled integrated structure, and can be compiled into a three-phase hairpin coil before winding. During assembly, the three-phase hairpin coil can be directly wound on the stator core, reducing the welding operation after the stator winding is assembled on the stator core, reducing the assembly difficulty, and can effectively improve the assembly efficiency.

[0026] The axial flux motor provided by the present invention includes the above-mentioned motor stator, so it also has the above-mentioned structure and beneficial effects. Other structures refer to the existing technology and are not described here in detail. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0028] Figure 1 The winding of the stator winding disclosed in the embodiment of the utility model Figure 1 ;

[0029] Figure 2 The winding of the stator winding disclosed in the embodiment of the utility model Figure 2 ;

[0030] Figure 3 The winding of the stator winding disclosed in the embodiment of the utility model Figure 3 ;

[0031] Figure 4 This is a schematic structural diagram of the iron core disclosed in an embodiment of the present utility model;

[0032] Figure 5 This is a schematic diagram of the overall structure of the stator core disclosed in an embodiment of the present utility model;

[0033] Figure 6 This is a schematic structural diagram of a card issuing unit disclosed in an embodiment of the present utility model;

[0034] Figure 7 This is a schematic structural diagram of a single-phase hairpin coil disclosed in an embodiment of the present utility model;

[0035] Figure 8 This is a schematic structural diagram of a three-phase hairpin coil disclosed in an embodiment of the present utility model;

[0036] Figure 9 This is a partial enlarged view of the three-phase hairpin coil disclosed in the embodiment of the present utility model;

[0037] Figure 10 The present invention discloses a schematic structural diagram of a motor stator according to an embodiment of the present invention.

[0038] Among them, 10 is the iron core, 11 is the stator plate;

[0039] 20 is a three-phase hairpin coil, 20a is the first hairpin coil, 20b is the second hairpin coil, 20c is the third hairpin coil, 21 is the first hairpin connecting wire, and 22 is the second hairpin connecting wire;

[0040] 200 is a hairpin unit, 210 is a middle section, 211 is an arc-shaped protrusion, 220 is a connecting section, 230 is an edge section, and 231 is a connecting protrusion. DETAILED DESCRIPTION

[0041] The core of the utility model is to disclose a motor stator to improve the assembly efficiency of the stator winding.

[0042] Another core of the present invention is to disclose an axial flux motor including the above-mentioned motor stator.

[0043] The following embodiments are described with reference to the accompanying drawings. The embodiments described below do not limit the scope of the utility model as set forth in the claims. Furthermore, the entire contents of the components described in the following embodiments are not necessarily required to provide the solutions described in the claims. It should be noted that, for ease of description, only the portions relevant to the utility model are shown in the accompanying drawings. The embodiments and features of the embodiments of the present utility model may be combined with one another unless there is a conflict.

[0044] Combine Figures 1-10 The motor stator disclosed in the present invention includes a stator core and a stator winding. The stator core includes a plurality of iron cores 10, which are arranged in a ring shape, and a gap is provided between two adjacent iron cores 10; the stator winding is wound on each iron core 10, and the stator winding includes a multi-layer three-phase hairpin coil 20, each of which is composed of three parallel single-phase hairpin coils, and the single-phase hairpin coils of each layer of the three-phase hairpin coil 20 are connected in series one by one, and each single-phase hairpin coil of each layer of the three-phase hairpin coil 20 is an integrated structure.

[0045] During assembly, each single-phase hairpin coil is pre-assembled and formed, and then assembled into a three-phase hairpin coil 20, and then the three-phase hairpin coil 20 is installed on the iron core 10. After each three-phase hairpin coil 20 is wound on the iron core 10, each single-phase hairpin coil in each three-phase hairpin coil 20 is matched one by one and connected in series to complete the assembly of the motor stator.

[0046] Compared with the prior art process of inserting all the flat wires into the stator slots and then bending them for welding, the one-way hairpin coil in the motor stator disclosed in the embodiment of the utility model is a pre-assembled integrated structure, and can be compiled into a three-phase hairpin coil 20 before winding. During assembly, the three-phase hairpin coil 20 can be directly wound on the stator core, reducing the welding operation after the stator winding is assembled on the stator core, reducing the assembly difficulty, and effectively improving the assembly efficiency.

[0047] Combine Figure 7-Figure 9 Each layer of three-phase hairpin coils 20 is woven from three single-phase hairpin coils. Each single-phase hairpin coil has a starting end and an ending end. Three-phase hairpin coils 20 have three starting ends and three ending ends. The ends of the single-phase hairpin coils in two adjacent layers of three-phase hairpin coils 20 are connected in a one-to-one correspondence. "Adjacent" here refers to axial proximity along the annular structure formed by the stator core.

[0048] Take the stator winding including four layers of three-phase hairpin coils 20 as an example for explanation. Figure 1-Figure 3 This is the winding diagram of the corresponding stator winding. It should be noted that the four layers in the figure are only examples and cannot be used as a limitation. The circles in the figure represent the connection points of different single-phase hairpin coils.

[0049] Among them, the numerical labels in the figure indicate that the stator core is provided with 48 stator slots, and the single-phase hairpin coils of the three-phase hairpin coils 20 in different layers are connected in series to form three parallel lines of the first hairpin coil 20a, the second hairpin coil 20b and the third hairpin coil 20c. The head ends of the three lines are respectively led out and the tail ends are connected to the same wiring point.

[0050] Taking the winding path of the first hairpin coil 20a around the stator core as an example, Figure 3 The specific winding route is 39-34-27-22-15-10-3-45, and its pitches include 5, 7 and 6. During the process of winding one circle of the stator core, the pitches 7 and 5 alternate. When the first circle of the first hairpin coil 20a is completed and the second circle is wound, a transition is made through pitch 6. After the transition is completed, the second circle continues to use the alternating pitches 7 and 5. This setting can reduce the mutual interference between single-phase hairpin coils and improve the slot fill rate.

[0051] The above pitches are only examples and are not intended to be limiting. Those skilled in the art can reasonably select and match different pitches according to actual needs.

[0052] Figure 4 and Figure 5FIG. 0 is a schematic structural diagram of the iron core 10 and the stator iron core. The iron core 10 is disposed on the stator plate 11, and the stator plate 11 is made of a non-metallic composite material. The stator iron core is the stator iron core of an axial-flux motor in the prior art, and specifically can be a multi-segment open-slot iron core. Combining Figure 4 around the iron core 10 are provided with chamfers and insulated, and the wire coil can be closely attached to the edge of the iron core 10. The main purpose of the illustration is to facilitate the reader to understand the structure of the stator iron core, and the present utility model does not specifically modify the structure of the stator iron core.

[0053] Combining Figure 6 and Figure 7 in an embodiment, the single-phase hairpin coil is an integral structure formed by sequentially connecting a plurality of hairpin monomers 200. The plurality of hairpin monomers 200 can be welded and connected into an integral structure. The hairpin monomer 200 includes a middle segment 210, an edge segment 230 and a connecting segment 22, the middle segment 210 is used for winding around the inner circle of the iron core 10, and an arc-shaped protrusion 211 for avoiding adjacent (here "adjacent" indicates the adjacency caused by the staggered winding paths of each single-phase hairpin coil in the stator winding) single-phase hairpin coils is provided on the middle segment 210; the edge segment 230 is in two segments, which are used for winding around the outer circle of the iron core 10, and a connecting protrusion 231 for connecting with the adjacent single-phase hairpin coil is provided; the connecting segment 22 is in two segments and is respectively connected between the middle segment 210 and the edge segment 230, and is used for winding in the gap between two adjacent iron cores 10. The middle segment 210, the edge segment 230 and the connecting segment 22 are of an integral structure, which is generally in the shape of a "ji" character and can be integrally formed.

[0054] In some other embodiments, the single-phase hairpin coil is an integral structure formed by bending one or more flat wires, and this structure can effectively reduce the number of solder joints and reduce the assembly difficulty.

[0055] Combining Figure 7 and Figure 8 the three single-phase hairpin coils of a single three-phase hairpin coil 20 are wound in a staggered manner, so that each three-phase hairpin coil 20 can be pre-assembled into a whole, and at the same time it is convenient for wiring between the single-phase hairpin coils after being assembled onto the stator iron core.

[0056] Combining Figure 1 and Figure 8 the single-phase hairpin coils of adjacent two layers of three-phase hairpin coils 20 are welded and connected in a one-to-one correspondence. During the process of sequentially placing each three-phase hairpin coil 20 onto the stator iron core, mechanical fixation and welding of each three-phase hairpin coil 20 are carried out in sequence. Or, after all the three-phase hairpin coils 20 are placed onto the stator iron core, welding of all the three-phase hairpin coils 20 is carried out finally.

[0057] As Figure 1As shown in the figure, the circles represent welding points. The single-phase hairpin coils of two adjacent layers of three-phase hairpin coils 20 can be directly connected or connected in series via the first hairpin connection line 21; the ends of the three-phase hairpin coils 20 are connected to the power supply via the second hairpin connection line 22.

[0058] The axial flux motor disclosed in the present invention includes the above-mentioned motor stator, so it also has the above-mentioned structure and beneficial effects. Other structures refer to the existing technology and are not described here in detail.

[0059] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Specific technical means in some embodiments may be incorporated in part or in whole into another embodiment, unless expressly excluded by another embodiment. Therefore, the present invention will not be limited to the embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A motor stator, characterized in that: include: The stator core comprises a plurality of iron cores (10) arranged in a ring shape, with a gap provided between two adjacent iron cores (10); A stator winding is wound on each of the iron cores (10), and the stator winding includes multiple layers of three-phase clipping coils (20). Each of the three-phase clipping coils (20) is composed of three parallel single-phase clipping coils, and the single-phase clipping coils of each layer of the three-phase clipping coils (20) are connected in series one by one, and each of the single-phase clipping coils is an integrated structure.

2. The motor stator according to claim 1, characterized in that: The single-phase hairpin coil is an integrated structure formed by sequentially connecting a plurality of hairpin monomers (200), and the hairpin monomers (200) include: The middle section (210) is used for winding around the inner ring of the iron core (10), and is provided with an arc-shaped protrusion (211) for avoiding adjacent single-phase hairpin coils; The edge segment (230) is composed of two segments and is used to be wound around the outer ring of the iron core (10) and connected to the adjacent single-phase hairpin coil; The connecting section (220) is composed of two sections and is connected one-to-one between the middle section (210) and the edge section (230). The connecting section (220) is used to be wound between two adjacent iron cores (10). The middle section (210), the edge section (230) and the connecting section (220) are an integrated structure.

3. The motor stator according to claim 2, characterized in that: One end of the edge segment (230) away from the connecting segment (220) is provided with a connecting protrusion (231) for connecting to an adjacent single-phase hairpin coil.

4. The motor stator according to claim 1, characterized in that: The three single-phase hairpin coils of the three-phase hairpin coil (20) are wound in an interlaced manner.

5. The motor stator according to claim 1, characterized in that: The single-phase hairpin coil is an integrated structure prepared by bending a copper wire; and / or, The single-phase hairpin coil is made of flat wire.

6. The motor stator according to claim 1, characterized in that: The single-phase hairpin coils of two adjacent layers of the three-phase hairpin coils (20) are connected by welding.

7. The motor stator according to claim 1, characterized in that: The single-phase hairpin coils of the three-phase hairpin coils (20) of two adjacent layers are directly connected or connected in series via a first hairpin connection line (21); and / or, The end of the three-phase hairpin coil (20) is connected to a power source via a second hairpin connection line (22).

8. The motor stator according to claim 1, characterized in that: The pitches of the single-phase hairpin coils include 5, 7 and 6.

9. The motor stator according to claim 1, characterized in that: The edges of the iron core (10) are chamfered.

10. An axial flux motor, characterized in that: The motor comprises the stator according to any one of claims 1 to 9.

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