Stator for hub motor, hub motor and electric two-wheeled vehicle

Abstract

A stator for a hub motor comprises a stator support and a coil wound on the stator support, the stator support comprises a supporting part and a plurality of stator teeth arranged on the periphery of the supporting part, and each stator tooth comprises a tooth part and a shoe part movably arranged on the tooth part; the tooth part and the supporting part are of an integrally-formed structure, and the coil is wound around the tooth part. The utility model also provides a hub motor using the stator and an electric two-wheeled vehicle using the hub motor. Compared with the prior art, the winding process of the stator is simpler, the efficiency is higher, and the stator support has higher structural strength.

Description

Technical Field

[0001] This utility model belongs to the field of stator technology, specifically relating to a stator for a hub motor, a hub motor using the stator, and an electric two-wheeled vehicle using the hub motor. Background Technology

[0002] Flat wire motors are smaller in size, use less material, and are cheaper for the same power output. Alternatively, they can increase slot fill factor and power density for the same volume. This is of great significance for enterprises to reduce costs and meet the high power requirements of motors.

[0003] Because the winding process of copper wire in flat wire motors is more complex than that in round wire motors, the stator support of some existing flat wire motors is formed by splicing multiple individual units. This type of stator suffers from several drawbacks. First, because the entire stator structure is composed of multiple spliced ​​units, its structural stability is poor, and it is prone to loosening. Second, the splicing process requires winding and splicing each unit individually, which is cumbersome, slow, and inefficient. Furthermore, to further secure the stator support, a fixing structure is needed, which not only makes the overall structure more complex but also increases costs.

[0004] For example, the double-flat wire winding stator device disclosed in application number 202110438996.4 has a stator support formed by splicing several splicing pieces end to end in a circumferential shape. Specifically, the curved ends of the splicing pieces are provided with slots and inserts, and adjacent splicing pieces are spliced ​​and fixed by the slots and inserts. Since the stator support is composed of multiple splicing pieces, splicing and winding need to be done one by one, which is cumbersome, inefficient, and the structure after splicing has low strength, is not reliable, has poor stability, and is prone to loosening. If a fixing structure is needed to further fix the stator structure, a fixing structure is required, which will make the overall structure more complex and increase the cost.

[0005] For example, in the large-square flat wire hub motor disclosed in application number 202210945374.5, the structure on the stator bracket used for winding is also made of splicing blocks, which still has the problems of low assembly efficiency, low structural strength after splicing, and easy loosening. Utility Model Content

[0006] The purpose of this invention is to overcome the shortcomings of the prior art and provide a stator for hub motors.

[0007] To achieve the above objectives, this utility model discloses a stator for a hub motor, comprising a stator support and a coil wound on the stator support. The stator support includes a support portion and a plurality of stator teeth disposed on the outer periphery of the support portion. The stator teeth include tooth portions and shoe portions movably disposed on the tooth portions. The coil is wound on the tooth portions.

[0008] Preferably, one of the teeth and the boot is provided with a slot, and the other is provided with a locking block that engages with the slot.

[0009] Preferably, one end of the tooth is connected to the support portion, and the other end of the tooth is engaged with the boot portion.

[0010] Preferably, the two sides of the toothed part along the circumferential direction are engaged with limiting blocks, and the two limiting blocks on the toothed part form the boot part.

[0011] Preferably, one end of the tooth is connected to the support, and the other end of the tooth is provided with two prefabricated boots; a winding groove is formed between two adjacent teeth, and the two prefabricated boots are bent toward the two adjacent winding grooves to form the boots.

[0012] Preferably, the two prefabricated boot parts are arranged in a circumferential direction, and a stop groove is formed between the two prefabricated boot parts after bending, and a stop block is provided in the stop groove.

[0013] Preferably, the ratio of the maximum width of the stop groove to the maximum width of the tooth is 0.3 to 0.8.

[0014] Preferably, the two sidewalls of the two pre-set boot sections are provided with grooves at their roots.

[0015] Before bending, the two side walls of the two pre-set boot parts and the end face of the teeth form a triangular space.

[0016] This utility model also provides a hub motor using the stator described above for hub motors, the specific solution of which is as follows:

[0017] A hub motor includes a stator and a rotor rotatable relative to the stator, said stator being any of the stators described above for a hub motor.

[0018] This utility model also provides an electric two-wheeled vehicle using the above-mentioned hub motor, the specific solution of which is as follows:

[0019] An electric two-wheeled vehicle includes a frame, a battery pack mounted on the frame, a front wheel mounted on the frame, and a rear wheel mounted on the frame. The rear wheel includes a hub motor and a tire mounted on the hub motor. The hub motor is any of the hub motors described above.

[0020] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0021] The stator of this invention features a boot-shaped part that is movably mounted on the teeth. When the stator needs to be wound with flat wire, the flat wire can be wound into a coil first, then the coil can be placed on the teeth. Finally, the boot-shaped part is placed on the teeth, abutting against the coil, thereby fixing the coil onto the teeth. By movably mounting the boot-shaped part on the teeth, the flat wire can be wound into a coil first and then placed on the teeth, eliminating the need to wind the flat wire individually on each tooth. This simplifies the winding process and increases efficiency.

[0022] The support and the teeth are integrally molded, which improves the structural strength of the stator support and avoids the problems of insufficient overall structural strength and loosening that occur in existing stator structures which are spliced ​​together from splice blocks. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the stator structure used in the hub motor in Example 1;

[0024] Figure 2 for Figure 1 A partial schematic diagram of the stator teeth;

[0025] Figure 3 A partial schematic diagram of a stator tooth with a different slot and block structure;

[0026] Figure 4 A partial schematic diagram of a stator tooth with a different slot and block structure;

[0027] Figure 5 This is a schematic diagram of another stator structure in Example 1 (excluding coils);

[0028] Figure 6 for Figure 5 A partial schematic diagram of the stator teeth;

[0029] Figure 7 This is a schematic diagram of another stator structure before bending in Example 1 (excluding coils);

[0030] Figure 8 for Figure 7 A partial schematic diagram of the stator teeth;

[0031] Figure 9 for Figure 7 A schematic diagram of the stator structure after bending;

[0032] Figure 10 for Figure 9 A partial schematic diagram of the stator teeth;

[0033] Stator support 1;

[0034] Support part 2;

[0035] Stator tooth 3; tooth part 31; shoe part 32; limit block 321; prefabricated shoe part 322; stop groove 323; stop block 324; groove 325; slot 33; block 34;

[0036] Winding groove 4;

[0037] Coil 5. Detailed Implementation

[0038] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, the utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0039] Example 1

[0040] A stator for a hub motor, see [link / reference] Figures 1-10 The system includes a stator support 1 and a coil 5 wound on the stator support 1. The stator support 1 includes a support portion 2 and multiple stator teeth 3 located on the outer periphery of the support portion 2. The specific number of stator teeth 3 can be set according to actual needs. Each stator tooth 3 includes a tooth portion 31 and a shoe portion 32 movably disposed on the tooth portion 31. The tooth portion 31 and the support portion 2 are integrally formed. The coil 5 is wound on the tooth portion 31 and abuts against the shoe portion 32. Preferably, the coil is a flat wire coil, which is particularly advantageous for winding flat wire coils in this embodiment. When the stator support 1 is composed of multiple stacked silicon steel sheets, the tooth portion 31 and the support portion 2 on a single silicon steel sheet are integrally formed. In the aforementioned stator, since the shoe part 32 is movably mounted on the tooth part 31, when the stator needs to be wound with flat wire, the flat wire can first be wound into a coil 5, then the coil 5 can be placed on the tooth part 31, and finally the shoe part 32 is set on the tooth part 31, with the shoe part 32 abutting against the coil 5, thereby fixing the coil 5 on the tooth part 31. By movably mounting the shoe part 32 on the tooth part 31, the flat wire can be wound into a coil first and then placed on the tooth part 31, eliminating the need to wind the flat wire individually on each tooth part 31, making the winding process simpler and more efficient. The support part 2 and the stator tooth 3 are integrally formed structures, which improves the structural strength of the stator support 1 and avoids the problems of insufficient overall structural strength and easy loosening caused by the existing stator structure being spliced ​​from spliced ​​blocks.

[0041] In this design, one of the toothed portion 31 and the boot portion 32 is provided with a slot 33, and the other is provided with a locking block 34 that engages with the slot 33. When assembling the boot portion 32, the boot portion 32 is fixed to the toothed portion 31 through the engagement of the slot 33 and the locking block 34, thereby abutting the coil 5. The above-mentioned locking structure is simple and easy to assemble.

[0042] In this embodiment, specifically, see [link to specific examples]. Figures 1-2One end of the toothed part 31 is connected to the support part 2, and the other end of the toothed part 31 is provided with the aforementioned slot 33. The boot part 32 is provided with the aforementioned locking block 34. The locking block 34 of the boot part 32 is locked in the slot 33, thereby fixing it to the toothed part 31.

[0043] The shapes of the card slot 33 and the card block 34 can be set as needed, such as... Figures 2-4 Three structures are provided.

[0044] In other alternative implementations, see Figures 5-6 The toothed portion 31 has two limiting blocks 321 engaged on its two circumferential sides, forming a boot portion 32. When the coil 5 is fitted onto the toothed portion 31, the two limiting blocks 321 are engaged on the two sides of the toothed portion 31 to hold the coil 5 in place. The first type of boot portion 32 structure is directly located at the end of the toothed portion 31, and it can only accommodate toothed portions 31 of a certain width. Otherwise, if the width of the boot portion 32 is too small, it cannot hold the coil 5 in place; or if the width of the boot portion 32 is too large, it is prone to interference with adjacent boot portions 32. In the boot portion 32 structure of this embodiment, since the boot portion 32 consists of limiting blocks 321 respectively located on the two side walls of the toothed portion 31, the coil 5 can be fixed as long as the two side walls of the toothed portion 31 are engaged with the limiting blocks 321. Compared to this first type of boot portion 32 structure, this structure is more suitable for toothed portions 31 with a wider range of widths.

[0045] In other alternative implementations, see Figures 7-10 One end of the tooth 31 is connected to the support 2, and the other end of the tooth 31 is provided with two prefabricated shoe parts 322. A winding groove 4 is formed between two adjacent teeth 31. Before bending, the two prefabricated shoe parts 322 will not extend into the two adjacent winding grooves 4 to avoid affecting the assembly of the coil 5. After the coil 5 is fitted onto the tooth 31, the two prefabricated shoe parts 322 bend towards the two adjacent winding grooves 4 to hold the coil 5, forming the aforementioned shoe parts 32. In this embodiment, the shoe parts 32 are two prefabricated shoe parts 322 on the tooth 31, which increases the structural strength of the stator tooth 3. There will be no loosening problem between the tooth 31 and the shoe parts 32, thus improving the structural reliability.

[0046] Two prefabricated boot sections 322 are arranged circumferentially, and a stop groove 323 is formed between the two prefabricated boot sections 32 after bending. A stop block 324 is provided in the stop groove 323. The stop block 324 in the stop groove 323 can restrict the prefabricated boot section 322 from bending back, ensuring the coil fixing effect.

[0047] The ratio of the maximum width of the stop groove 323 to the maximum width of the tooth 31 is 0.3 to 0.8. This size ratio allows the two shoe parts 32 to be located in the stop groove before bending, thus avoiding interference with the coil 5.

[0048] The two pre-fabricated boot parts 32 have grooves 325 at the base of their opposite sidewalls. These grooves 325 facilitate bending of the pre-fabricated boot parts 322 and prevent cracks or breakage during bending. Before bending, the two opposite sidewalls of the two pre-fabricated boot parts 32 and the end face of the toothed part 31 form a triangular space. This prevents the two pre-fabricated boot parts 322 from touching each other before bending, as there is a certain space between them, which facilitates bending.

[0049] Example 2

[0050] A hub motor includes a stator and a rotor rotatable relative to the stator, the stator being the stator for a hub motor of Embodiment 1.

[0051] Example 3

[0052] An electric two-wheeled vehicle includes a frame, a battery pack mounted on the frame, a front wheel mounted on the frame, and a rear wheel mounted on the frame. The rear wheel includes a hub motor and a tire mounted on the hub motor. The hub motor is the hub motor of Embodiment 2.

[0053] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating this utility model, and are not intended to limit the implementation of this utility model. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.

Claims

1. A stator for a hub motor, comprising a stator support and coils wound on the stator support, characterized in that: The stator support includes a support portion and a plurality of stator teeth disposed on the outer periphery of the support portion. The stator teeth include tooth portions and shoe portions movably disposed on the tooth portions. The tooth portions and the support portion are integrally formed, and the coil is wound on the tooth portions.

2. The stator for a hub motor according to claim 1, characterized in that: One of the teeth and the boot part is provided with a slot, and the other is provided with a locking block that engages with the slot.

3. The stator for a hub motor according to claim 2, characterized in that: One end of the tooth is connected to the support part, and the other end of the tooth is engaged with the boot part.

4. The stator for a hub motor according to claim 2, characterized in that: Both sides of the toothed part along the circumferential direction are engaged with limiting blocks, and the two limiting blocks on the toothed part form the boot part.

5. The stator for a hub motor according to claim 1, characterized in that: One end of the tooth is connected to the support, and the other end of the tooth is provided with two prefabricated boots; a winding groove is formed between two adjacent teeth, and the two prefabricated boots are bent toward the two adjacent winding grooves to form the boots.

6. The stator for a hub motor according to claim 5, characterized in that: The two prefabricated boot parts are arranged in a circumferential direction, and a stop groove is formed between the two prefabricated boot parts after bending, and a stop block is provided in the stop groove.

7. The stator for a hub motor according to claim 6, characterized in that: The ratio of the maximum width of the stop groove to the maximum width of the tooth is 0.3 to 0.

8.

8. The stator for a hub motor according to claim 6, characterized in that: The two pre-set boot sections have grooves at the base of their opposite sidewalls. Before bending, the two side walls of the two pre-set boot parts and the end face of the teeth form a triangular space.

9. A hub motor, comprising a stator and a rotor rotatable relative to the stator, characterized in that: The stator is the stator for a hub motor as described in any one of claims 1-8.

10. An electric two-wheeled vehicle, comprising a frame, a battery pack mounted on the frame, a front wheel mounted on the frame, and a rear wheel mounted on the frame, the rear wheel comprising a hub motor and a tire mounted on the hub motor, characterized in that, The hub motor is the hub motor as described in claim 9.

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