Stator tooth, iron core assembly, stator assembly, driving motor and vehicle
By setting a connection between the stator teeth singles, the problems of large cogging torque and high air gap harmonic content of the tangential magnetic field motor are solved, and the motor vibration noise and torque fluctuation are reduced, and the motor output torque is maintained.
Patent Information
- Application Number
- CN202421637970.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-10
- Publication Date
- 2025-07-11
- Estimated Expiration
- 2034-07-10
AI Technical Summary
Tangential magnetic field motors have problems such as large cogging torque, high air gap harmonic content and high vibration noise, especially when there is a large torque, and the defect that cannot be improved by not connecting adjacent electronic toothing units.
By providing a plurality of connecting parts between the stator teeth monomers, the connecting parts are arranged at a distance axially, and the size satisfies a<(a+b)*1/5, the size of the connecting parts is 0.6mm≤t≤1.5mm in the radial direction and 0.6mm≤a≤1.2mm in the axial direction, and a closed groove is formed to reduce the cogging torque and air gap harmonic content.
It effectively reduces motor vibration noise and cogging torque, reduces low-load torque pulsation, maintains the stability of motor output torque, and reduces motor vibration noise and torque fluctuations.
Smart Images
Figure CN223093548U_ABST
Abstract
Description
Technical Field
[0001] The present disclosure relates to the technical field of motors, and in particular, to a stator tooth, a core assembly, a stator assembly, a drive motor, and a vehicle. Background Art
[0002] A tangential field motor is a type of built-in motor, that is, the permanent magnets are built inside the rotor, and the permanent magnet distribution of the tangential field is such that the magnetization direction is along the tangential direction, so it is called a tangential field motor. The tangential field permanent magnet synchronous motor uses two permanent magnets to jointly provide magnetic flux for the magnetic circuit, so the tangential field motor has the advantages of high air-gap magnetic density and large output torque. However, inevitably, the tangential field motor also has its disadvantages. Due to the characteristics of the permanent magnet distribution of the tangential field motor, the cogging torque of the tangential field motor is large, the corresponding air-gap harmonic content is large, and the cogging pulsation is large, especially obvious at large torques, resulting in relatively large motor vibration and noise.
[0003] In the related art, there is no connection between adjacent stator tooth monomers. Although it has the advantage of large output torque, it cannot improve the problem of large cogging torque and relatively large vibration and noise. Summary of the Utility Model
[0004] The purpose of the present disclosure is to provide a stator tooth, a core assembly, a stator assembly, a drive motor, and a vehicle to at least partially solve the problems existing in the related art.
[0005] To achieve the above object, the present disclosure provides a stator tooth, including a plurality of stator tooth monomers arranged at intervals in the circumferential direction. Adjacent stator tooth monomers are connected by a plurality of connecting portions, and the plurality of connecting portions are arranged at intervals in the axial direction. The dimension a of the connecting portion in the axial direction and the distance b between the adjacent connecting portions in the axial direction satisfy: a < (a + b) * 1 / 5.
[0006] Optionally, the dimension t of the connecting portion in the radial direction satisfies: 0.6 mm ≤ t ≤ 1.5 mm.
[0007] Optionally, the dimension a of the connecting portion in the axial direction satisfies: 0.6 mm ≤ a ≤ 1.2 mm.
[0008] Optionally, the stator tooth monomer includes:
[0009] A boot portion, the boot portions of the plurality of stator tooth monomers surround to form a hollow cylindrical structure, and the inside of the cylindrical structure is used to install a rotor. Adjacent boot portions are connected by the connecting portions; and
[0010] A tooth portion, connected to the outer wall of the boot portion, for winding a stator winding.
[0011] According to a second aspect of the present disclosure, there is also provided an iron core assembly, including a stator yoke and the above-mentioned stator teeth, and the stator yoke is detachably sleeved coaxially outside the stator teeth.
[0012] Optionally, one of the tooth part and the stator yoke is provided with a protrusion, and the other is provided with a groove engaged with the protrusion.
[0013] Optionally, both the protrusion and the groove are configured as V-shaped structures.
[0014] Optionally, both the protrusion and the groove are configured as T-shaped structures. Among them, the protrusion includes a first section and a second section, and the first section is arranged farther from the boot part than the second section.
[0015] Optionally, the width c1 of the second section and the width c2 of the first section satisfy: c2 - c1 > 2 mm.
[0016] Optionally, the width c1 of the second section and the width c3 of the tooth part satisfy: c3 - c1 > 2 mm.
[0017] Optionally, the dimension c4 of the first section in the radial direction < c5 * 1 / 2, where c5 is the distance between the position of the stator yoke in contact with the tooth part and the outer wall of the stator yoke.
[0018] According to a third aspect of the present disclosure, there is also provided a stator assembly, including the above-mentioned iron core assembly and a stator winding wound on the individual stator teeth.
[0019] According to a fourth aspect of the present disclosure, there is also provided a drive motor, including the above-mentioned stator assembly.
[0020] According to a fifth aspect of the present disclosure, there is also provided a vehicle, including the above-mentioned drive motor.
[0021] Through the above technical solutions, a plurality of individual stator teeth are connected into a whole through a plurality of spaced connection parts. Since the output torque cannot be lost too much, there are certain requirements for the interval size between the connecting ribs, and the optimal way should satisfy a < (a + b) * 1 / 5. In this way, while ensuring that the output torque of the motor will not be greatly reduced, the cogging torque of the motor, the harmonic content of the air gap and the torque ripple under light load can be reduced as much as possible, effectively reducing the motor vibration noise.
[0022] Other features and advantages of the present disclosure will be described in detail in the subsequent specific implementation part. Brief Description of the Drawings
[0023] The accompanying drawings are used to provide a further understanding of the present disclosure and constitute a part of the specification. Together with the following specific embodiments, they are used to explain the present disclosure, but do not constitute a limitation to the present disclosure. In the accompanying drawings:
[0024] Figure 1 is a schematic structural diagram of a stator tooth provided by an exemplary embodiment of the present disclosure;
[0025] Figure 2 is a schematic distribution diagram of a plurality of connecting portions between adjacent stator tooth monomers in the stator tooth provided by an exemplary embodiment of the present disclosure;
[0026] Figure 3 is a cross-sectional view of a stator tooth provided by an exemplary embodiment of the present disclosure;
[0027] Figure 4 is a schematic structural diagram of a stator yoke in a core assembly provided by an exemplary embodiment of the present disclosure;
[0028] Figure 5 is a cross-section of a core assembly provided by an exemplary embodiment of the present disclosure Figure 1 ;
[0029] Figure 6 is Figure 5 a partial enlarged view of A in
[0030] Figure 7 is a cross-section of a core assembly provided by an exemplary embodiment of the present disclosure Figure 2 ;
[0031] Figure 8 is a line chart comparison of the torque-torque fluctuation percentage between a driving motor in the prior art and a driving motor provided by an exemplary embodiment of the present disclosure.
[0032] Description of Reference Numerals
[0033] 1 Stator tooth 11 Stator tooth monomer
[0034] 111 Boot portion 112 Tooth portion
[0035] 12 Connecting portion 2 Stator yoke
[0036] 3 Protrusion 31 First section
[0037] 32 Second section 4 Groove
[0038] 5 Stator slot Specific Embodiments
[0039] The following provides a detailed description of the specific embodiments of the present disclosure in conjunction with the accompanying drawings. It should be understood that the specific embodiments described herein are only used to illustrate and explain the present disclosure and are not used to limit the present disclosure.
[0040] In the present disclosure, unless otherwise stated, "inner" and "outer" refer to the contour of the corresponding component itself. In the present disclosure, when the following description relates to the drawings, unless otherwise indicated, the same numerals in different drawings represent the same or similar elements.
[0041] Referring to Figures 1 to 8 , the present disclosure provides a stator tooth 1, which may include a plurality of stator tooth monomers 11 arranged at intervals in the circumferential direction. Adjacent stator tooth monomers 11 are connected by a plurality of connecting portions 12 to connect the plurality of stator tooth monomers 11 into a whole, thereby forming the stator tooth 1. The plurality of connecting portions 12 are arranged at intervals in the axial direction. In an embodiment of the present disclosure, the plurality of connecting portions 12 are evenly distributed between adjacent stator tooth monomers 11. The dimension a of the connecting portion 12 in the axial direction and the distance b between the connecting portions 12 adjacent in the axial direction satisfy: a < (a + b) * 1 / 5. Wherein, a cannot be too large. Although a larger a will reduce the cogging torque and optimize the cogging ripple of the motor, and can greatly reduce the vibration and noise of the motor, it will cause a significant decrease in the output torque of the motor, and the performance cannot meet the requirements. Therefore, the optimal method should satisfy a < (a + b) * 1 / 5 and b > (a + b) * 4 / 5. Specifically, through actual analysis, the output torque of the motor after connecting adjacent stator tooth monomers 11 with the connecting portion 12 is 77% of the output torque of the motor without using the connecting portion 12. According to the above optimal method, the motor output torque loss = (1 / 5 * 77% + 4 / 5 * 1) / 1, that is, the maximum motor torque loss is about 4.8%. For a tangential magnetic field motor, since two permanent magnets jointly provide magnetic flux for the magnetic circuit, the tangential magnetic field permanent magnet motor can improve other performances by losing 4.8% of the output torque.
[0042] Through the above technical solution, a plurality of stator tooth monomers are connected into a whole by a plurality of spaced connecting portions. Since the output torque cannot be lost too much, there are certain requirements for the interval dimension between the connecting ribs. The optimal method should satisfy a < (a + b) * 1 / 5. In this way, while ensuring that the output torque of the motor will not be significantly reduced, the cogging torque of the motor, the harmonic content of the air gap, and the torque ripple under light load can be reduced as much as possible, effectively reducing the vibration and noise of the motor.
[0043] In an exemplary embodiment of the present disclosure, referring to Figure 6, the dimension t of the connecting portion 12 in the radial direction satisfies: 0.6 mm ≤ t ≤ 1.5 mm. While meeting the structural strength, t should be as small as possible. When t is too small, the structural strength is not satisfied; when t is too large, although the cogging torque of the motor and the cogging ripple of the small load can be reduced to a great extent, the output torque of the motor will also be greatly reduced. In the embodiments of the present disclosure, t satisfies: 0.6 mm ≤ t ≤ 1.5 mm, and specifically can be 0.8 mm, 1 mm, 1.2 mm. It can not only meet the structural strength characteristics of the motor, but also, while ensuring that the output torque of the motor will not be greatly reduced, reduce the cogging torque of the motor and the torque ripple of the small load as much as possible, effectively reducing the vibration and noise of the motor.
[0044] Further, the dimension a of the connecting portion 12 in the axial direction can satisfy: 0.6 mm ≤ a ≤ 1.2 mm, and specifically can be 0.8 mm, 1 mm. Through the above settings, the cogging torque and the harmonic content of the air gap of the motor can be reduced, and at the same time, the vibration and noise of the motor are also reduced.
[0045] Among them, referring to Figure 1 , Figure 5 , the stator tooth unit 11 can include a boot portion 111 and a tooth portion 112. Among them, the boot portions 111 of multiple stator tooth units 11 surround to form a hollow cylindrical structure, and the inside of the cylindrical structure is used to install the rotor, and adjacent boot portions 111 are connected by a connecting portion 12; the tooth portion 112 is connected to the outer wall of the boot portion 111 and is used to wind the stator winding. Specifically, the tooth portion 112 is radially protruded and arranged on the outer wall of the boot portion 111.
[0046] Due to the cogging effect, there is a cogging torque between the stator and the rotor. Using this stator tooth 1 can make the cogging torque smaller. For the same motor scheme, the cogging torque of the motor without the connecting portion 12 is 133.9 mN·m, and the cogging torque of the motor with the connecting portion 12 is 118.1 mN·m. Using the stator tooth 1 of the present disclosure can reduce the cogging torque by 12%, and can greatly reduce the vibration and noise of the motor. Moreover, referring to Figure 8 and the following table, adding the connecting portion 12 will make the torque output of the motor smoother and reduce the torque ripple of the small load. The smaller the torque, the greater the proportion of the torque fluctuation decrease.
[0047] Comparison table of motor torque fluctuations between "with connecting portion - without connecting portion":
[0048]
[0049]
[0050] According to the second aspect of the present disclosure, referring to Figure 5, a core assembly is also provided. The core assembly may include a stator yoke 2 and the above-mentioned stator teeth 1. The stator yoke 2 is coaxially and detachably sleeved outside the stator teeth 1. A stator slot 5 is formed between the individual stator teeth 11 and the stator yoke 2. Since the adjacent individual stator teeth 11 are connected by a connecting portion 12, the stator slot 5 is a closed slot. If the stator teeth 1 and the stator yoke 2 are integrally formed, the ends of the tooth portion 112 close to and away from the stator yoke 2 are both fixed, and wire embedding or winding cannot be performed. Therefore, the stator teeth 1 and the stator yoke 2 are separately provided. First, wire is wound on the tooth portion 112, and then the stator teeth 1 are installed inside the stator yoke 2, which avoids affecting wire embedding or winding and can maximize the slot fill factor of the motor. The core assembly has all the beneficial effects of the above-mentioned stator teeth 1, which will not be elaborated here.
[0051] In some embodiments, one of the tooth portion 112 and the stator yoke 2 may be provided with a protrusion 3, and the other may be provided with a groove 4 that engages with the protrusion 3. A plurality of grooves 4 may be circumferentially and evenly spaced on the inner wall of the stator yoke 2 to cooperate with the protrusions 3 on the plurality of tooth portions 112. The stator yoke 2 and the stator teeth 1 are assembled together to form a core assembly through the cooperation of the protrusion 3 and the groove 4.
[0052] As an exemplary embodiment of the present disclosure, referring to Figure 1 , Figure 4 , both the protrusion 3 and the groove 4 may be configured as a V-shaped structure. The cooperation mode of the V-shaped protrusion and the V-shaped groove can make the assembly more convenient and easy to process.
[0053] As another exemplary embodiment of the present disclosure, referring to Figure 7 , both the protrusion 3 and the groove 4 may be configured as a T-shaped structure. Among them, the protrusion 3 may include a first section 31 and a second section 32. The first section 31 is disposed farther from the boot portion 111 than the second section 32. The cooperation of the T-shaped protrusion and the T-shaped groove can make the connection between the stator teeth 1 and the stator yoke 2 more stable, and avoid a large gap between the stator teeth 1 and the stator yoke 2 during operation.
[0054] The assembly method does not affect other performances of the motor.
[0055] Further, referring to Figure 7 , the width c1 of the second section 32 and the width c2 of the first section 31 may satisfy: c2 - c1 > 2 mm. The first section 31 can play a role in limiting the stator teeth 1, and the width c2 of the first section 31 is at least 2 mm larger than the width c1 of the second section 32.
[0056] Further, referring to Figure 7, the width c1 of the second segment 32 and the width c3 of the tooth portion 112 can satisfy: c3 - c1 > 2 mm. If the width c1 of the second segment 32 is too large, it will also cause the width c2 of the first segment 31 to be too large, affecting the structural strength.
[0057] Furthermore, referring to Figure 7 , in order that the assembly method does not affect other performances of the motor and to ensure the structural strength, the dimension c4 of the first segment 31 in the radial direction < c5 * 1 / 2, where c5 is the distance between the position of the stator yoke 2 in contact with the tooth portion 112 and the outer wall of the stator yoke 2.
[0058] According to the third aspect of the present disclosure, there is also provided a stator assembly, which may include the above-mentioned iron core assembly and a stator winding wound around the stator tooth monomer 11. This stator assembly has all the beneficial effects of the above-mentioned iron core assembly, which will not be elaborated here.
[0059] According to the fourth aspect of the present disclosure, there is also provided a driving motor, which may include the above-mentioned stator assembly. This driving motor has all the beneficial effects of the above-mentioned stator assembly, which will not be elaborated here.
[0060] According to the fifth aspect of the present disclosure, there is also provided a vehicle, which may include the above-mentioned driving motor. This vehicle has all the beneficial effects of the above-mentioned driving motor, which will not be elaborated here.
[0061] The preferred embodiments of the present disclosure have been described in detail above with reference to the accompanying drawings. However, the present disclosure is not limited to the specific details in the above embodiments. Within the scope of the technical concept of the present disclosure, various simple modifications can be made to the technical solutions of the present disclosure, and these simple modifications all fall within the protection scope of the present disclosure.
[0062] In addition, it should be noted that, among the various specific technical features described in the above specific embodiments, they can be combined in any suitable manner without contradiction. To avoid unnecessary repetition, the present disclosure will not separately describe various possible combination methods.
[0063] In addition, any combination can be made between various different embodiments of the present disclosure, as long as it does not violate the idea of the present disclosure, it should also be regarded as the content disclosed by the present disclosure.
Claims
1. A stator tooth, characterized in that, It includes a plurality of stator tooth monomers arranged at circumferential intervals, and adjacent stator tooth monomers are connected by a plurality of connecting parts which are arranged at axial intervals. The dimension a of the connecting part in the axial direction and the distance b between the connecting parts adjacent in the axial direction satisfy: a < (a + b) * 1 / 5.
2. The stator tooth according to claim 1, wherein The dimension t of the connecting part in the radial direction satisfies: 0.6 mm ≤ t ≤ 1.5 mm.
3. The stator tooth according to claim 1, wherein The dimension a of the connecting part in the axial direction satisfies: 0.6 mm ≤ a ≤ 1.2 mm.
4. The stator tooth according to claim 1, characterized in that, The stator tooth monomer includes: a boot part, and the boot parts of a plurality of stator tooth monomers surround to form a hollow cylindrical structure. The inside of the cylindrical structure is used for installing a rotor, and adjacent boot parts are connected by the connecting parts; and a tooth part, which is connected to the outer wall of the boot part and is used for winding a stator winding.
5. A core assembly, characterized in that, It includes a stator yoke and the stator teeth according to any one of claims 1-4, and the stator yoke is detachably sleeved coaxially outside the stator teeth.
6. The iron core assembly according to claim 5, wherein, One of the tooth part and the stator yoke is provided with a protrusion, and the other is provided with a groove engaged with the protrusion.
7. The iron core assembly according to claim 6, wherein Both the protrusion and the groove are configured as V-shaped structures.
8. The iron core assembly according to claim 6, characterized in that, Both the protrusion and the groove are configured as T-shaped structures, wherein the protrusion includes a first section and a second section, and the first section is arranged farther from the boot part than the second section.
9. The iron core assembly according to claim 8, wherein, The width c1 of the second section and the width c2 of the first section satisfy: c2 - c1 > 2 mm.
10. The iron core assembly according to claim 8, characterized in that, The width c1 of the second section and the width c3 of the tooth part satisfy: c3 - c1 > 2 mm.
11. The iron core assembly according to claim 8, characterized in that, The dimension c4 of the first section in the radial direction < c5 * 1 / 2, where c5 is the distance between the position of the stator yoke in contact with the tooth part and the outer wall of the stator yoke.
12. A stator assembly, characterized in that, It includes a core assembly according to any one of claims 5-11, and a stator winding wound on the stator tooth monomers.
13. A drive motor, characterized in that, It includes the stator assembly according to claim 12.
14. A vehicle, characterized in that, It includes the drive motor according to claim 13.