High torque motor
By combining a V-shaped mounting slot and two layers of magnets on the rotor, the problems of low torque and high heat generation caused by amorphous alloy materials are solved, achieving efficient and stable motor performance.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-11-29
- Publication Date
- 2026-03-13
AI Technical Summary
Existing motors use amorphous alloy materials, resulting in low saturation magnetic induction and low core stacking coefficient, which leads to a significant decrease in torque. Furthermore, copper losses increase under medium to high torque conditions, causing severe motor overheating.
The rotor is equipped with multiple independent V-shaped mounting slots, combined with inner and outer layers of magnets, to optimize the magnetic flow direction and air gap magnetic density. It uses an amorphous stator and a high-strength silicon steel rotor. By adjusting the size and position of the magnets, the ratio of reluctance torque to permanent magnet torque is optimized, thereby reducing copper loss and iron loss.
It improves the motor's output torque capability, reduces current-generated heat, enhances the motor's working efficiency and heat dissipation capacity, and improves the overall performance of the motor.
Smart Images
Figure CN121663855A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of motor technology, and in particular to a high-torque motor. Background Technology
[0002] In related technologies, existing motors generally use amorphous alloy materials to replace traditional silicon steel in pursuit of efficiency. However, amorphous iron cores have low saturation magnetic induction, low iron core stacking coefficient, and short effective magnetic flux path, resulting in a significant decrease in motor torque. Furthermore, due to their low torque output characteristics, copper losses will be significantly increased under medium to high torque conditions, which will cause serious heat generation problems during long-term continuous operation of the motor, leaving room for improvement. Summary of the Invention
[0003] The present invention aims to at least solve one of the technical problems existing in the prior art. Therefore, one object of the present invention is to provide a high-torque motor that has high operating efficiency and good working performance.
[0004] A high-torque motor according to an embodiment of the present invention includes: a stator having a plurality of slots arranged at intervals along its circumference for mounting wires; a rotor rotatably disposed on the outer periphery of the stator having a plurality of mounting slots arranged at intervals along its circumference for mounting first magnets, the mounting slots including: two independent and spaced slots, each slot having a first end disposed away from the stator and the first ends of the two slots being close to each other, and a second end of each slot being disposed close to the stator and the second ends of the two slots being far apart; and a plurality of second magnets disposed on the inner periphery of the rotor and arranged at intervals along the circumference of the rotor.
[0005] According to embodiments of the present invention, a high-torque motor is provided on the rotor with multiple mounting slots, each mounting slot including two independent slots that can form a V-shaped structure, with the opening of the V-shaped structure facing the stator side. This allows the mounting slots to have a better magnetic focusing effect, adjust the magnetic circuit flow direction, and optimize the reluctance torque. By providing multiple second magnets on the inner circumference of the rotor, the air gap magnetic flux density can be increased, thereby improving the output torque capability of the high-torque motor. This optimizes the copper loss of the high-torque motor when using an amorphous stator, increases the torque of the high-torque motor, reduces the current of the high-torque motor under the same torque to reduce the heat generation of the conductors, improves the working efficiency of the high-torque motor, enhances the heat dissipation capacity of the high-torque motor, and improves the working effect of the high-torque motor.
[0006] According to some embodiments of the present invention, the second magnet is arc-shaped, the magnetization direction of each second magnet extends radially along the rotor, and the magnetization directions of two adjacent second magnets are respectively directed towards the inner and outer sides of the stator radially along the rotor.
[0007] According to some embodiments of the present invention, along the circumference of the rotor, the circumference of the inner circumference of the rotor is L, and the total length of the plurality of second magnets is L1, satisfying: 0.7≤L1 / L≤0.9.
[0008] According to some embodiments of the present invention, along the circumferential direction of the rotor, the length of each second magnet is l1, and the length of each first magnet is L2, satisfying: 2L2 <l1。
[0009] According to some embodiments of the present invention, the minimum interval length between the two slots along the circumferential direction of the rotor is L3, which satisfies: 0.6mm≤L3≤2mm.
[0010] According to some embodiments of the present invention, the included angle between the two grooves on the side closer to the stator is α1, satisfying: α1>110°.
[0011] According to some embodiments of the present invention, each of the slots includes: a first slot for mounting the second magnet, one end of the first slot being the first end of the slot; and a second slot, one end of the second slot being connected to the other end of the first slot, and the other end of the second slot being the second end of the slot.
[0012] In some embodiments, the included angle between the first groove and the second groove on the side closer to the stator is α2, satisfying: α2>90°.
[0013] In some embodiments, the width dimension of the second groove along the radial direction of the rotor gradually increases or decreases in the direction near the second end.
[0014] According to some embodiments of the present invention, the rotor is further provided with a plurality of air holes arranged at intervals along its circumference, and along the radial direction of the rotor, the plurality of air holes are located between a plurality of second magnets and a plurality of first magnets; wherein, the thickness of each air hole is T, and the width of each air hole is W, satisfying: 0.5mm≤T≤1mm, 0.8mm≤W≤1.5mm.
[0015] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description
[0016] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which: Figure 1 This is a partial structural schematic diagram of a high-torque motor according to some embodiments of the present invention; Figure 2This is a partial structural schematic diagram of a high-torque motor according to other embodiments of the present invention; Figure 3 This is a partial structural schematic diagram of a high-torque motor according to some embodiments of the present invention; Figure 4 This is a dimensional schematic diagram of the internal structure of a high-torque motor according to some embodiments of the present invention.
[0017] Figure label: High torque motor 100, Stator 10, cable tray 11, Rotor 20, mounting slot 21, slot body 211, first slot body 2111, second slot body 2112, air hole 22. Wire 30, first magnet 40, second magnet 50. Detailed Implementation
[0018] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.
[0019] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential," etc., indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings and are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. Furthermore, features defined with "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, unless otherwise stated, "a plurality of" means two or more.
[0020] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.
[0021] The following is for reference. Figures 1-4 A high-torque motor 100 according to an embodiment of the present invention is described.
[0022] like Figures 1-4 As shown, the high-torque motor 100 according to an embodiment of the present invention includes: a stator 10, a rotor 20, and a plurality of second magnets 50. The stator 10 may be provided with a plurality of wire slots 11 arranged at intervals along its circumference. The wire slots 11 are used to install wires 30, which can be round wires or flat wires. The rotor 20 is rotatably disposed on the outer circumference of the stator 10. The rotor 20 may be provided with a plurality of mounting slots 21 arranged at intervals along its circumference for installing first magnets 40 (such as magnets or permanent magnets). This allows the first magnets 40 to drive the rotor 20 to rotate relative to the stator 10 when the wires 30 are energized, thus ensuring the normal operation of the high-torque motor 100.
[0023] Multiple second magnets 50 (such as magnets or permanent magnets) can be arranged on the inner circumference of the rotor 20, and the multiple second magnets 50 can be arranged at intervals along the circumference of the rotor 20, which can improve the air gap magnetic flux density and improve the output torque capability of the high torque motor 100. The mounting slot 21 can include two independent slots 211, which can be arranged opposite to each other. The first end of each slot 211 can be arranged away from the stator 10, and the first ends of the two slots 211 are close to each other.
[0024] The second end of each slot 211 can be set close to the stator 10, and the second ends of the two slots 211 are far apart, that is, the two slots 211 cooperate to form a V-shaped structure of the mounting slot 21, and the opening of the V-shaped structure faces the stator 10 side, so that the mounting slot 21 can have a better magnetic concentration effect, can adjust the magnetic circuit flow direction, can optimize the magnetic reluctance torque, and the two slots 211 can be arranged at intervals to form a magnetic isolation bridge structure, which can ensure the structural strength of the rotor 20.
[0025] The stator 10 can be made of amorphous material. For example, the core of the stator 10 can be made of amorphous laminated stamping and bonding, which can reduce iron loss during the operation of the high torque motor 100 and improve the working efficiency of the high torque motor 100 under different working conditions. The rotor 20 can be made of high-strength silicon steel material, which can ensure the reliability of the rotor 20 at high speed. Since the rotor 20 contains two layers of magnets (the first magnet 40 and the second magnet 50 mentioned above), the magnetic flux can be generated by the combined action of the two layers of magnets.
[0026] Therefore, based on reducing the iron loss of the high-torque motor 100 to improve its working efficiency, the copper loss of the high-torque motor 100 using the amorphous stator 10 can be optimized, thereby increasing the torque of the high-torque motor 100. This compensates for the low torque capability caused by the low saturation magnetic induction and low superposition factor of the amorphous stator, as well as the problem of increased copper loss at medium and high torque. It can also reduce the current of the high-torque motor 100 under the same torque to reduce the heat generation of the conductor 30, and improve the heat dissipation capacity of the high-torque motor 100, thus improving the working effect of the high-torque motor 100.
[0027] According to an embodiment of the present invention, the high-torque motor 100, by providing a plurality of mounting slots 21 on the rotor 20, and each mounting slot 21 including two independent slot bodies 211 that can form a V-shaped structure, with the opening of the V-shaped structure facing the stator 10, allows the mounting slots 21 to have a better magnetic focusing effect, and can adjust the magnetic circuit flow direction, thereby optimizing the reluctance torque. By providing a plurality of second magnets 50 on the inner circumference of the rotor 20, the air gap magnetic flux density can be increased, thereby improving the output torque capability of the high-torque motor 100. This optimizes the copper loss of the high-torque motor 100 when using the amorphous stator 10, increases the torque of the high-torque motor 100, and reduces the current of the high-torque motor 100 under the same torque to reduce the heat generation of the conductor 30, thereby improving the working efficiency of the high-torque motor 100 and enhancing the heat dissipation capacity of the high-torque motor 100, thus improving the working effect of the high-torque motor 100.
[0028] like Figure 1 As shown, according to some embodiments of the present invention, the second magnet 50 can be arc-shaped, so that the second magnet 50 can fit more closely with the inner circumference of the rotor 20, which can improve the fixing effect of the second magnet 50. The magnetization direction of each second magnet 50 can extend radially along the rotor 20, and the magnetization direction of two adjacent second magnets 50 can be radially towards the inner and outer sides of the stator 10 respectively. The multiple second magnets 50 can be symmetrically arranged around the rotation axis of the rotor 20, and the multiple second magnets 50 can be alternately distributed along NSNS within the entire high torque motor 100, which can ensure the normal operation of the high torque motor 100.
[0029] like Figure 1 and Figure 4As shown, according to some embodiments of the present invention, each second magnet 50 extends along the periodic boundary along the circumference of the rotor 20. The length of the periodic boundary can be l, the circumference of the inner circumference of the rotor 20 can be L, and the circumference of the inner circumference of the rotor 20 is an integer multiple of the length of the periodic boundary. The length of each second magnet 50 can be l1, and the total length of the plurality of second magnets 50 can be L1, and the total length of the plurality of second magnets 50 is an integer multiple of the length of each second magnet 50. The ratio of the length of each second magnet 50 to the length of the periodic boundary is equal to the ratio of the total length of the plurality of second magnets 50 to the circumference of the inner circumference of the rotor 20, i.e., l1 / l = L1 / L.
[0030] If the ratio of the length of each second magnet 50 to the length of the periodic boundary is too large, the length of the second magnet 50 will be too long and require too much material, increasing the cost. If the ratio of the length of each second magnet 50 to the length of the periodic boundary is too small, the torque of the high-torque motor 100 will be too small. Therefore, L1 / L can be limited to the range between 0.7 and 0.9, that is, 0.7≤l1 / l≤0.9. For example, l1 / l can be any one of 0.7, 0.8 and 0.9 or any range between two of them. This can increase the torque of the high-torque motor 100 and control the cost of the high-torque motor 100. At the same time, it can provide a higher and more stable air gap magnetic flux density, reduce the leakage flux of the first magnet 40 entering the air gap through the iron core of the rotor 20, enhance the main magnetic flux jointly generated by the first magnet 40 and the second magnet 50, and enhance the magnetic field energy.
[0031] like Figure 1 and Figure 4 As shown, according to some embodiments of the present invention, the length of each second magnet 50 along the circumference of the rotor 20 can be l1, and the length of each first magnet 40 can be L2. Along the radial direction of the rotor 20, each second magnet 50 corresponds to a mounting slot 21. If the lengths of the two first magnets 40 are greater than or equal to the length of the second magnet 50, the length of the first magnet 40 is too long and requires too much material, increasing costs. Furthermore, the excess length of the first magnet 40 has limited effect. Therefore, the lengths of the two first magnets 40 can be limited to a range smaller than that of the second magnet 50, reducing the length of the first magnet 40 and lowering costs. It also allows for full utilization of the opposing portions of the first magnets 40 and second magnets 50, resulting in a better magnetizing effect and increasing the torque of the high-torque motor 100.
[0032] like Figure 1 and Figure 4As shown, according to some embodiments of the present invention, along the circumference of the rotor 20, the minimum interval length (the length of the aforementioned magnetic bridge structure) between the two slots 211 of each mounting slot 21 can be L3. If the minimum interval length between the two slots 211 is too small, the structural strength of the rotor 20 will be low. If the minimum interval length between the two slots 211 is too large, the magnetic focusing effect of the mounting slot 21 will be affected, resulting in a lower output torque of the entire high-torque motor 100. Therefore, the minimum interval length between the two slots 211 can be limited to between 0.6 mm and 2 mm. For example, L3 can be any one of 0.6 mm, 1 mm, 1.4 mm, 1.8 mm, and 2 mm, or any value between any two. This can improve the structural strength of the rotor 20, improve the magnetic focusing effect of the mounting slot 21, and improve the torque of the high-torque motor 100.
[0033] like Figure 1 and Figure 4 As shown, according to some embodiments of the present invention, the included angle between the two slots 211 on the side near the stator 10 can be α1. If the included angle between the two slots 211 on the side near the stator 10 is too small, the portion of the first magnet 40 and the second magnet 50 corresponding to the radial position of the rotor 20 will be smaller, and the magnetizing effect of the mounting slot 21 will be affected, resulting in a lower output torque of the entire high torque motor 100. Therefore, the included angle between the two slots 211 on the side near the stator 10 can be limited to a range greater than 110°, which can increase the portion of the first magnet 40 and the second magnet 50 corresponding to the radial position of the rotor 20, improve the magnetizing effect of the mounting slot 21, and increase the torque of the high torque motor 100.
[0034] like Figure 1 and Figure 4 As shown, according to some embodiments of the present invention, each slot 211 may include a first slot 2111 and a second slot 2112. The first slot 2111 may be used to mount the second magnet 50. The included angle between the two first slots 2111 of each mounting slot 21 on the side near the stator 10 may be α1. By limiting α1 to a range greater than 110°, the portion of the first magnet 40 and the second magnet 50 corresponding to the radial position of the rotor 20 can be increased, and the magnetizing effect of the mounting slot 21 can be improved, thereby increasing the torque of the high torque motor 100.
[0035] One end of the first groove 2111 can be the first end of the groove 211, and one end of the second groove 2112 is connected to the other end of the first groove 2111. The other end of the second groove 2112 can be the second end of the groove 211, so that the two grooves 211 can cooperate to make the entire mounting groove 21 roughly form a V-shaped structure. The opening of the V-shaped structure faces the stator 10 side, so that the mounting groove 21 can have a better magnetic focusing effect, can adjust the magnetic circuit flow direction, and can optimize the magnetic reluctance torque.
[0036] It is understandable that the first magnet 40 may not completely fill the first slot 2111, and the extended second slot 2112 contains air as a magnetic barrier, which can adjust the magnetic reluctance. The magnetic barrier and the aforementioned V-shaped structure together constitute a magnetic circuit, which can change the difference between the quadrature and direct axes inductance, improve the saliency ratio, optimize the reluctance torque and permanent magnet torque, and optimize the proportion of permanent magnet torque. Based on ensuring the performance of the high torque motor 100, the amount of magnets used can be reduced to lower the cost, and the iron loss and copper loss of the high torque motor 100 can be reduced, thereby improving the working efficiency and performance of the high torque motor 100.
[0037] like Figure 1 and Figure 4 As shown, in some embodiments, the included angle between the first groove 2111 and the second groove 2112 near the stator 10 can be α2. The second groove 2112 contains air to optimize the direction of the magnetic field lines. If the included angle between the first groove 2111 and the second groove 2112 near the stator 10 is too small, the optimization effect of the magnetic field line direction will be poor. Therefore, the included angle between the first groove 2111 and the second groove 2112 near the stator 10 can be limited to a range greater than 90°, which is convenient for arrangement and can improve the optimization effect of the magnetic field line direction. It can optimize the reluctance torque, and by adjusting its length and shape at the beginning of the design, it can guide the direction of the magnetic field lines, optimize the air gap magnetic field, and optimize the reluctance torque.
[0038] like Figure 1 and Figure 2 As shown, in some embodiments, the width of the second groove 2112 along the radial direction of the rotor 20 can gradually increase or decrease in the direction near the second end. That is, by adjusting its length and shape at the beginning of the design, the direction of the magnetic field lines can be guided, the air gap magnetic field can be optimized, and the magnetic barrier and the above-mentioned V-shaped structure together constitute the magnetic circuit, which can change the difference between the quadrature and direct axes inductance, improve the saliency ratio, optimize the reluctance torque, optimize the proportion of permanent magnet torque, and reduce the amount of magnets used. This can reduce the iron loss and copper loss of the high torque motor 100, and improve the working efficiency and working effect of the high torque motor 100.
[0039] like Figure 1 and Figure 3As shown, according to some embodiments of the present invention, the rotor 20 may also be provided with a plurality of air holes 22 arranged at intervals along its circumference, and along the radial direction of the rotor 20, the plurality of air holes 22 may be located between a plurality of second magnets 50 and a plurality of first magnets 40, which can reduce the electromagnetic force of the amorphous high torque motor 100 and improve the NVH (noise, vibration and harshness) performance of the high torque motor 100. The thickness of each air hole 22 along the radial direction of the rotor 20 may be T, and the width of each air hole 22 along the circumference of the rotor 20 may be W.
[0040] If the thickness or width of each pore 22 is too small, the pore 22 will have no practical function. If the thickness or width of each pore 22 is too large, it will affect the electromagnetic force and torque of the amorphous high torque motor 100. Therefore, the thickness of each pore 22 can be limited to the range between 0.5mm and 1mm, and the width of each pore 22 can be limited to the range between 0.8mm and 1.5mm. For example, T can be any one of 0.5mm, 0.7mm, 0.9mm and 1mm or any value between any two, and W can be any one of 0.8mm, 1mm, 1.2mm, 1.4mm and 1.5mm or any value between any two. This can achieve the adjustment of the air gap magnetic flux density, improve the magnetic field harmonics, improve the NVH performance of the high torque motor 100, and ensure the electromagnetic force and torque of the amorphous high torque motor 100.
[0041] In this application, an outer rotor 20 is provided outside the amorphous stator 10, and a hybrid magnetic circuit consisting of a V-shaped first magnet 40 and a surface-mounted second magnet 50 is provided on the outer rotor 20. By adjusting the size and placement of the first magnet 40 and the second magnet 50, higher magnetic field energy can be provided, the reluctance torque ratio can be optimized, the amount of magnets used can be reduced, the problem of insufficient torque capacity of the amorphous iron core can be improved, the current of the high torque motor 100 under the same torque can be reduced, the copper loss of the amorphous high torque motor 100 can be optimized, and the heat dissipation problem of the high torque motor 100 can be improved.
[0042] The structure of this application can be applied to drive motors or range extenders, and the high torque motor 100 can be protected by a sheath for the rotor 20 structure when matching ultra-high speed scenarios; the amorphous inner stator 10 core is not limited to using an amorphous stator 10 as a whole, but can also be a stator form combining amorphous and non-oriented silicon steel or oriented silicon steel; the surface-mounted second magnet 50 on the inner circumference of the outer rotor 20 can be a uniform arc segment or a non-uniform arc segment; the first magnet 40 and the second magnet 50 are not limited to a single magnet material, that is, the first magnet 40 and the second magnet 50 can be made of different materials respectively.
[0043] Other configurations and operations of the high-torque motor 100 according to embodiments of the present invention are known to those skilled in the art and will not be described in detail here. In the description of the present invention, "first feature" and "second feature" may include one or more of the features. The vertical, horizontal, and front-back directions are defined as shown in the figures.
[0044] In the description of this invention, unless otherwise expressly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features not in direct contact but through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature.
[0045] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.
[0046] Although embodiments of the invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.
Claims
1. A high-torque motor, characterized in that, include: The stator has multiple slots arranged at intervals along its circumference for installing wires; A rotor, rotatably disposed on the outer periphery of the stator, is provided with a plurality of mounting slots spaced apart along its circumference for mounting a first magnet, the mounting slots including: Two independent and spaced-apart tanks, each tank having a first end away from the stator and the first ends of the two tanks being close to each other, and each tank having a second end close to the stator and the second ends of the two tanks being far apart; A plurality of second magnets are disposed on the inner circumference of the rotor and arranged at intervals along the circumference of the rotor.
2. The high-torque motor according to claim 1, characterized in that, The second magnet is arc-shaped, and the magnetization direction of each second magnet extends radially along the rotor, and the magnetization directions of two adjacent second magnets are respectively directed towards the inner and outer sides of the stator radially along the rotor.
3. The high-torque motor according to claim 1, characterized in that, Along the circumferential direction of the rotor, the circumference of the inner circumference of the rotor is L, and the total length of the plurality of second magnets is L1, satisfying: 0.7≤L1 / L≤0.
9.
4. The high-torque motor according to claim 1, characterized in that, Along the circumferential direction of the rotor, the length of each second magnet is l1, and the length of each first magnet is L2, satisfying: 2L2< l1。 5. The high-torque motor according to claim 1, characterized in that, Along the circumferential direction of the rotor, the minimum interval length between the two slots is L3, satisfying: 0.6mm≤L3≤2mm.
6. The high-torque motor according to claim 1, characterized in that, The included angle between the two slots on the stator side is α1, satisfying: α1>110°。 7. The high-torque motor according to claim 1, characterized in that, Each of the aforementioned tanks includes: A first groove, the first groove being used to install the second magnet, one end of the first groove being the first end of the groove; The second tank has one end connected to the other end of the first tank, and the other end of the second tank is the second end of the tank.
8. The high-torque motor according to claim 7, characterized in that, The angle between the first groove and the second groove on the side closest to the stator is α2, satisfying: α2>90°。 9. The high-torque motor according to claim 7, characterized in that, The width of the second groove along the radial direction of the rotor gradually increases or decreases in the direction near the second end.
10. The high-torque motor according to claim 1, characterized in that, The rotor is also provided with a plurality of air holes arranged at intervals along its circumference, and along the radial direction of the rotor, the plurality of air holes are located between a plurality of second magnets and a plurality of first magnets; Wherein, the thickness of each pore is T, and the width of each pore is W, satisfying: 0.5mm≤T≤1mm, 0.8mm≤W≤1.5mm.