A stator assembly and a hub motor

Abstract

The utility model relates to the technical field of electric motors for electric vehicles, and specifically discloses a stator assembly and a wheel hub motor, wherein an outer iron core is fixedly sleeved on the outer periphery of an inner iron core, the outer iron core is alternately provided with a plurality of first stator teeth and a plurality of first stator slots along the circumferential direction, the inner iron core is alternately provided with a plurality of second stator teeth and a plurality of second stator slots along the circumferential direction, the winding coil comprises a plurality of first winding coils and a plurality of second winding coils, the plurality of first winding coils are arranged in one-to-one correspondence with the plurality of first stator teeth, and the first winding coil is wound around the first stator teeth, the plurality of second winding coils are arranged in one-to-one correspondence with the plurality of second stator teeth, and the second winding coil is wound around the second stator teeth. The design of the inner and outer double-slot iron cores can allow the wheel hub motor to embed more coil conductors, increase the conductor cross-section and the number of turns, improve the motor power density, widen the motor magnetic circuit, reduce the motor loss, and achieve the purpose of increasing the power of the wheel hub motor.

Description

Technical Field

[0001] The utility model relates to the technical field of motors for electric vehicles, and in particular to a stator assembly and a hub motor. Background Art

[0002] With the development and popularization of transportation, electric two-wheeled vehicles are playing an increasingly important role in people's daily travel. At the same time, with the development of technology and the trend of electrification, electric two-wheeled vehicles will gradually replace traditional fuel motorcycles.

[0003] As the most commonly used drive motor for electric two-wheeled vehicles, the hub motor usually adopts a direct drive method of outer rotor plus stator in structure. Its power is directly output through the outer rotor. Its main function is to provide continuous and stable power for electric vehicles. It does not require any transmission system, and the driving force acts directly on the wheels. It has the characteristics of high driving efficiency, compact structure, and high reliability. However, the existing direct-drive hub motors for electric vehicles have limited adaptability to loads. Especially in large load and high torque situations, in order to maximize the climbing performance, that is, maximize the torque, it is necessary to put forward higher requirements on the operating power of the electric vehicle hub motor. Utility Model Content

[0004] The purpose of the utility model is to provide a stator assembly and a hub motor, which can embed more coil conductors and further improve the power of the hub motor of an electric vehicle.

[0005] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0006] In one aspect, the utility model provides a stator assembly, comprising:

[0007] A stator core, the stator core comprising an inner core and an outer core, the outer core being fixedly sleeved on the outer circumference of the inner core, the outer core being alternately provided with a plurality of first stator teeth and a plurality of first stator slots along a circumferential direction, and the inner core being alternately provided with a plurality of second stator teeth and a plurality of second stator slots along a circumferential direction;

[0008] The winding coil comprises a plurality of first winding coils and a plurality of second winding coils, the plurality of first winding coils are arranged in a one-to-one correspondence with the plurality of first stator teeth, and the first winding coils are wound around the first stator teeth, the plurality of second winding coils are arranged in a one-to-one correspondence with the plurality of second stator teeth, and the second winding coils are wound around the second stator teeth.

[0009] As a preferred technical solution of the above-mentioned stator assembly, two opposite and spaced-apart side walls of the first stator tooth are parallel to each other, and two opposite and spaced-apart side walls of the second stator tooth are parallel to each other.

[0010] As a preferred technical solution of the above-mentioned stator assembly, the first stator tooth is provided with a wire embedding channel, and the wire embedding channel passes through the first stator tooth and is connected to the second stator slot.

[0011] As a preferred technical solution for the above-mentioned stator assembly, a plurality of wire embedding openings are provided on the outer periphery of the outer iron core, and the plurality of wire embedding openings are arranged in one-to-one correspondence with the plurality of first stator slots, and the wire embedding openings are connected to the first stator slots, and the wire embedding openings are conical and are used to guide the first winding coil to be embedded in the first stator slot.

[0012] As a preferred technical solution of the above-mentioned stator assembly, the first stator slot and the second stator slot are both pear-shaped structures.

[0013] As a preferred technical solution of the above-mentioned stator assembly, a plurality of arc-shaped grooves are provided on the outer peripheral surface of the outer iron core, and the notch of the first stator slot is provided with a rounded corner.

[0014] As a preferred technical solution of the above-mentioned stator assembly, the end surface of the first stator tooth is provided with a plurality of slots, and the plurality of slots all penetrate the first stator tooth.

[0015] As a preferred technical solution of the above-mentioned stator assembly, the outer iron core has a first magnetic yoke, the inner iron core has a second magnetic yoke, and the width of the first magnetic yoke and the width of the second magnetic yoke are not less than half of the tooth width of the second stator tooth.

[0016] On the other hand, the utility model also provides a hub motor, including the stator assembly of any of the above schemes, the hub motor also includes a rotor assembly and a motor shaft, the inner iron core is fixedly sleeved on the motor shaft, and the rotor assembly is sleeved on the outer periphery of the outer iron core.

[0017] As a preferred technical solution of the above-mentioned hub motor, the hub motor also includes a permanent magnet, the rotor assembly includes a rim and a magnetic ring, the magnetic ring is fixedly sleeved on the outer periphery of the permanent magnet and connected to the inner wall of the rim, and the permanent magnet is spaced and sleeved on the outer periphery of the outer iron core.

[0018] The beneficial effects of the utility model are:

[0019] The utility model provides a stator assembly and a hub motor. The stator assembly comprises a stator core and a winding coil. The stator core comprises an inner core and an outer core. The outer core is fixedly sleeved on the outer circumference of the inner core. The outer core is alternately provided with a plurality of first stator teeth and a plurality of first stator slots along a circumferential direction. The inner core is alternately provided with a plurality of second stator teeth and a plurality of second stator slots along a circumferential direction. The winding coil comprises a plurality of first winding coils and a plurality of second winding coils. The plurality of first winding coils are arranged in one-to-one correspondence with the plurality of first stator teeth, and the first winding coils are wound around the first stator teeth. The plurality of second winding coils are arranged in one-to-one correspondence with the plurality of second stator teeth, and the second winding coils are wound around the second stator teeth. Such a setting, using the design of inner and outer double-slot iron core, can embed more coil conductors in the hub motor, increase the conductor cross-section and number of turns, improve the motor power density, widen the motor magnetic circuit, reduce motor losses, and achieve the purpose of increasing the power of the hub motor. In addition, with the increase in the cross-section of the hub motor conductor, the motor operating efficiency and temperature rise characteristics will be significantly improved. At the same time, because the winding coil has a tightening effect, the strength of the outer circle of the stator assembly is also stronger, reducing the unbalanced magnetic pull on one side of the motor, improving the NVH characteristics of the motor, and reducing the vibration response frequency of the motor. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 A schematic diagram of the structure of the hub motor provided by the utility model;

[0021] Figure 2 An exploded diagram of the hub motor provided by the utility model;

[0022] Figure 3 A schematic diagram of the structure of the stator core provided by the utility model;

[0023] Figure 4 A partial structural schematic diagram of the stator core provided by the utility model;

[0024] Figure 5 This is a partial structural schematic diagram of the stator assembly provided by the utility model.

[0025] in:

[0026] 1. stator core; 101. inner core; 102. outer core;

[0027] 2. first stator tooth; 3. first stator slot; 4. second stator tooth; 5. second stator slot; 6. first winding coil; 7. second winding coil; 8. wire embedding channel; 9. wire embedding opening; 10. arc-shaped groove; 11. slot hole; 12. first magnetic yoke; 13. second magnetic yoke;

[0028] 14. rotor assembly; 141. wheel rim; 142. magnetic guide ring;

[0029] 15. Permanent magnet; 16. Valve hole. DETAILED DESCRIPTION

[0030] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention.

[0031] In the description of the present invention, it should be noted that the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance. Among them, the terms "first position" and "second position" are two different positions.

[0032] Unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", and "fixed" should be understood in a broad sense, for example, it can be a fixed connection or a detachable connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this utility model can be understood according to specific circumstances.

[0033] Unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include the first feature being in direct contact with the second feature, or may include the first feature being in contact with the second feature through another feature between them instead of being in direct contact. Moreover, a first feature being "above", "above" and "above" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes the first feature being directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0034] The technical solution of the utility model is further explained below with reference to the accompanying drawings and through specific implementation methods.

[0035] like Figures 1 to 5As shown, this embodiment provides a stator assembly, which includes: a stator core 1 and a winding coil, the stator core 1 includes an inner core 101 and an outer core 102, the outer core 102 is fixedly sleeved on the outer circumference of the inner core 101, the outer core 102 is alternately provided with a plurality of first stator teeth 2 and a plurality of first stator slots 3 along the circumferential direction, the inner core 101 is alternately provided with a plurality of second stator teeth 4 and a plurality of second stator slots 5 along the circumferential direction, the winding coil includes a plurality of first winding coils 6 and a plurality of second winding coils 7, the plurality of first winding coils 6 are arranged in a one-to-one correspondence with the plurality of first stator teeth 2, and the first winding coils 6 are wound around the first stator teeth 2, the plurality of second winding coils 7 are arranged in a one-to-one correspondence with the plurality of second stator teeth 4, and the second winding coils 7 are wound around the second stator teeth 4. Such a configuration, using the design of inner and outer double-slot iron core, can allow the wheel hub motor to embed more coil conductors, increase the conductor cross-section and number of turns, improve the motor power density, widen the motor magnetic circuit, reduce motor losses, and achieve the purpose of increasing the power of the wheel hub motor. With the increase in the cross-section of the wheel hub motor conductor, the motor operating efficiency and temperature rise characteristics will be significantly improved. At the same time, because the winding coil has a tightening effect, the strength of the outer circle of this stator assembly is also stronger, reducing the unbalanced magnetic pull of the motor on one side, improving the motor NVH characteristics, and reducing the vibration response frequency of the motor. It should be noted that in other embodiments, in order to further embed more coil conductors, the stator core 1 can also be set to three or more layers according to actual needs, and no further restrictions are made here.

[0036] In this embodiment, the number of the first stator slots 3 and the number of the second stator slots 5 are both 48. Of course, in other embodiments, the number of slots corresponding to the stator core 1 can also be set according to actual needs. For example, the number of slots can be set to 36, 45, 54, 63 or 72, which is not further limited here.

[0037] Optionally, in order to reduce the resistance and magnetic resistance of the stator core 1, thereby improving the motor efficiency and reducing vibration noise, the two opposite and spaced side walls of the first stator tooth 2 are parallel to each other, and the two opposite and spaced side walls of the second stator tooth 4 are parallel to each other.

[0038] Optionally, see Figure 4 As shown, in order to make the second winding coil 7 more easily embedded in the second stator slot 5 and wound around the second stator tooth 4 without affecting the uniform and smooth operation of the magnetic circuit, the first stator tooth 2 is provided with a wire embedding channel 8, which passes through the first stator tooth 2 and communicates with the second stator slot 5. Further, the center line of the wire embedding channel 8 coincides with the center line of the first stator tooth 2.

[0039] Optionally, a plurality of wire embedding openings 9 are provided on the outer circumference of the outer iron core 102, and the plurality of wire embedding openings 9 are arranged one by one corresponding to the plurality of first stator slots 3, and the wire embedding openings 9 are connected to the first stator slots 3, and the wire embedding openings 9 are tapered and used to guide the first winding coil 6 to be embedded in the first stator slots 3. Such an arrangement enables the wire embedding openings 9 to have an inclined guiding surface, which can make it easier for the first winding coil 6 to be embedded in the first stator slots 3. It should be noted that after the installation and embedding are completed, the first winding coil 6 spans over the wire embedding channel 8, and does not affect the second winding coil 7.

[0040] Optionally, in order to effectively improve the filling degree of the corresponding first winding coil 6 and the second winding coil 7, the first stator slot 3 and the second stator slot 5 are both pear-shaped structures.

[0041] Optionally, a plurality of arc-shaped grooves 10 are provided on the outer circumference of the outer core 102, and the notch of the first stator slot 3 is provided with a rounded corner. Further, the number of the arc-shaped grooves 10 is two, and they are symmetrically arranged on both sides of the wire-inserting channel 8. Specifically, the radius of the rounded corner is 1 mm. With such an arrangement, when the magnetic field passes through the notch during actual operation of the motor, the cogging torque and torque fluctuation can be greatly weakened, the motor vibration and noise can be alleviated, and the motor salient polarity can be improved.

[0042] Optionally, the end surface of the first stator tooth 2 is provided with a plurality of slots 11, and the plurality of slots 11 all penetrate the first stator tooth 2. Further, the number of slots 11 is two, and they are symmetrically arranged on both sides of the wire insertion channel 8. In this way, the slots 11 can further reduce the cogging torque, and combined with the arc-shaped groove 10 and the rounded corners of the slot, the hub motor can achieve good torque stability and low noise characteristics even at high torque density.

[0043] In this embodiment, the slot shape of the first stator slot 3 is consistent with the slot shape of the second stator slot 5. At the same time, the first stator teeth 2, the first stator slot 3, the second stator teeth 4 and the second stator slot 5 are alternately arranged up and down and are evenly arranged.

[0044] Furthermore, the outer core 102 has a first magnetic yoke 12, the inner core 101 has a second magnetic yoke 13, and the width of the first magnetic yoke 12 and the width of the second magnetic yoke 13 are not less than half of the width of the second stator tooth 4. This arrangement makes the magnetic circuit of the motor more uniform and smooth, and is accompanied by a suitable magnetic flux density, avoiding the situation where the magnetic circuit is saturated due to excessive magnetic flux density, and the magnetic circuit is widened, the magnetic circuit is better, and the iron loss is lower, and the motor efficiency is effectively improved.

[0045] This embodiment also provides a hub motor, including the stator assembly in the above solution, the hub motor also includes a rotor assembly 14 and a motor shaft, the inner iron core 101 is fixedly sleeved on the motor shaft, and the rotor assembly 14 is sleeved on the outer periphery of the outer iron core 102. Further, the inner wall of the inner iron core 101 is provided with a limiting groove, and when the motor shaft is sleeved and installed, the limiting groove can limit and fix the inner iron core 101 to stop rotation.

[0046] Optionally, the hub motor further includes a permanent magnet 15, the rotor assembly 14 includes a rim 141 and a magnetic ring 142, the magnetic ring 142 is fixedly sleeved on the outer periphery of the permanent magnet 15 and connected to the inner wall of the rim 141, the inner wall of the rim 141 is provided with a valve hole 16, and the permanent magnet 15 is sleeved on the outer periphery of the outer core 102 at intervals. In this embodiment, the permanent magnet 15 is composed of 52 pieces of magnet steel arranged evenly, but illustratively, according to the different slot number settings, the magnet steel can be set to the corresponding number of poles (pieces), and no further limitation is made here.

[0047] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the implementation methods of the present invention. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all implementation methods here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included in the protection scope of the claims of the present invention.

Claims

1. A stator assembly, characterized in that: include: A stator core (1), the stator core (1) comprising an inner core (101) and an outer core (102), the outer core (102) being fixedly sleeved on the outer circumference of the inner core (101), the outer core (102) being provided with a plurality of first stator teeth (2) and a plurality of first stator slots (3) alternately along a circumferential direction, and the inner core (101) being provided with a plurality of second stator teeth (4) and a plurality of second stator slots (5) alternately along a circumferential direction; A winding coil, wherein the winding coil comprises a plurality of first winding coils (6) and a plurality of second winding coils (7), wherein the plurality of first winding coils (6) are arranged in a one-to-one correspondence with the plurality of first stator teeth (2), and the first winding coils (6) are wound around the first stator teeth (2), and the plurality of second winding coils (7) are arranged in a one-to-one correspondence with the plurality of second stator teeth (4), and the second winding coils (7) are wound around the second stator teeth (4).

2. The stator assembly according to claim 1, characterized in that: The two side walls of the first stator tooth (2) that are opposite and spaced apart are parallel to each other, and the two side walls of the second stator tooth (4) that are opposite and spaced apart are parallel to each other.

3. The stator assembly according to claim 1, characterized in that: The first stator tooth (2) is provided with a wire embedding channel (8), and the wire embedding channel (8) passes through the first stator tooth (2) and is connected to the second stator slot (5).

4. The stator assembly according to claim 1, characterized in that: The outer circumference of the outer iron core (102) is provided with a plurality of wire embedding openings (9), the plurality of wire embedding openings (9) are arranged in one-to-one correspondence with the plurality of first stator slots (3), and the wire embedding openings (9) are connected to the first stator slots (3), the wire embedding openings (9) are tapered, and are used to guide the first winding coil (6) to be embedded in the first stator slot (3).

5. The stator assembly according to any one of claims 1 to 4, characterized in that: The first stator slot (3) and the second stator slot (5) are both pear-shaped structures.

6. The stator assembly according to any one of claims 1 to 4, characterized in that: A plurality of arc-shaped grooves (10) are provided on the outer peripheral surface of the outer iron core (102), and the slot opening of the first stator slot (3) is provided with a rounded corner.

7. The stator assembly according to claim 6, characterized in that: The end surface of the first stator tooth (2) is provided with a plurality of slot holes (11), and the plurality of slot holes (11) all penetrate the first stator tooth (2).

8. The stator assembly according to any one of claims 1 to 4, characterized in that: The outer iron core (102) has a first magnetic yoke (12), and the inner iron core (101) has a second magnetic yoke (13). The width of the first magnetic yoke (12) and the width of the second magnetic yoke (13) are both not less than half of the tooth width of the second stator tooth (4).

9. A hub motor, characterized in that: The invention comprises the stator assembly as claimed in any one of claims 1 to 8, wherein the hub motor further comprises a rotor assembly (14) and a motor shaft, wherein the inner iron core (101) is fixedly sleeved on the motor shaft, and the rotor assembly (14) is sleeved on the outer periphery of the outer iron core (102).

10. The wheel hub motor according to claim 9, characterized in that: The hub motor also includes a permanent magnet (15), and the rotor assembly (14) includes a rim (141) and a magnetic ring (142). The magnetic ring (142) is fixedly mounted on the outer periphery of the permanent magnet (15) and connected to the inner wall of the rim (141). The permanent magnet (15) is spaced apart and mounted on the outer periphery of the outer iron core (102).

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