Outer-rotor permanent magnet motor

Abstract

The present invention relates to the technical field of motors, in particular to an outer-rotor permanent magnet motor, which includes a fixed base, a stator assembly, a rotor assembly and a rotating shaft assembly. The fixed base includes a fixed connection part and a rotating connection part; the stator assembly includes an inner ring body and a coil assembly arranged on the fixed connection part. The stator assembly includes an inner ring body and a plurality of winding columns arranged on the outer periphery of the inner ring body. A winding groove is provided between two adjacent winding columns; the coil assembly includes winding groups, and the winding groups are wound between two adjacent winding columns; the rotor assembly includes a rotor housing, and a magnetic ring assembly is arranged on the rotor housing facing the stator assembly, and the magnetic ring assembly is a Halbach array magnetic ring. By using the Halbach array magnetic ring as the magnetic ring assembly, the present invention can significantly enhance the magnetic field intensity of the motor, thereby improving the power density and efficiency of the motor.

Description

Technical Field

[0001] The present invention relates to the technical field of motors, and particularly to an outer-rotor permanent magnet motor. Background Art

[0002] An outer-rotor motor has an external rotor assembly, and a plurality of winding coils are included in the internal stator assembly. The rotor assembly can rotate in a magnetic field. Outer-rotor motors are commonly used in many different applications, including household appliances, industrial equipment, power tools, etc. They have advantages such as high efficiency, low noise, and small vibration.

[0003] In the prior art, Chinese Patent No. CN202121123558.0 discloses a direct drive motor, which includes a base, a stator assembly provided on the outer edge of the base, a rotating shaft assembly provided inside the base, and a rotor assembly connected to the rotating shaft assembly and covering the stator assembly. It has good stability when used in devices such as intelligent robots. However, due to limitations in the internal structure design, in actual use, the magnetic field strength of the motor is insufficient, affecting the power density and efficiency of the motor. Therefore, the existing motor structure can be further improved. Summary of the Invention

[0004] To solve the above problems, the present invention provides an outer-rotor permanent magnet motor that can improve the efficiency of the motor. By using a Halbach array magnetic ring as the magnetic ring assembly, the magnetic field strength of the motor can be significantly enhanced, thereby improving the power density and efficiency of the motor.

[0005] The technical solution adopted by the present invention is: an outer-rotor permanent magnet motor, including a fixed base, a stator assembly, a rotor assembly, and a rotating shaft assembly. The fixed base includes a fixed connection part and a rotating connection part; the stator assembly includes an inner ring body and a coil assembly provided on the fixed connection part. The stator assembly includes an inner ring body and a plurality of winding columns provided on the outer periphery of the inner ring body. A winding groove is provided between two adjacent winding columns; the coil assembly includes winding groups, and the winding groups are wound between two adjacent winding columns and form a winding unit with the two adjacent winding columns; the rotor assembly includes a rotor housing, and the rotor housing is provided with a magnetic ring assembly facing the stator assembly. The magnetic ring assembly is a Halbach array magnetic ring; the rotating shaft assembly is arranged inside the fixed base and connected to the rotor housing so that the rotor housing can drive the magnetic ring assembly to rotate around the stator assembly.

[0006] For further improvement of the above solution, a connection ring is provided on the fixed connection part. The connection ring is fixedly connected to the stator assembly. A limit ring is provided on one side of the connection ring, and the limit ring is used for installing and limiting the stator assembly.

[0007] A further improvement to the above solution is that a support step is provided on the side of the rotating connection part close to the fixed connection part, a rotor bearing is installed on the support step, an end cover is provided on the rotor housing, and the rotor housing is rotationally connected to the rotor bearing through the end cover.

[0008] A further improvement to the above solution is that the fixed connection part is provided with a first cavity, the rotating connection part is provided with a second cavity, and one end of the second cavity extends into the first cavity; a first electronic control board is arranged in the first cavity, the first electronic control board is provided with a driving module and a control module, the control module is used to control the driving module, and the driving module is used to drive the stator assembly and the rotor assembly to rotate in cooperation.

[0009] A further improvement to the above solution is that a second electronic control board is arranged in the second cavity, an encoder is arranged on the side of the second electronic control board facing the rotating shaft assembly, an induction magnetic ring is installed at one end of the rotating shaft assembly facing the encoder, and the encoder and the induction magnetic ring cooperate to sense the rotation of the rotating shaft assembly.

[0010] A further improvement to the above solution is that a wire routing groove is provided on one side of the second cavity, one end of the wire routing groove communicates with the first cavity, the second electronic control board is provided with a connecting wire, and the connecting wire is connected to the first electronic control board through the wire routing groove. The encoder is used to transmit the data of the cooperation with the induction magnetic ring to sense the rotation of the rotating shaft assembly to the control module.

[0011] A further improvement to the above solution is that the rotating shaft assembly includes a first bearing and a second bearing installed in the second cavity and a rotating shaft rotatably connected to the first bearing and the second bearing, and one end of the rotating shaft is fixedly connected to the rotor housing.

[0012] A further improvement to the above solution is that the winding groups include a phase A winding, a phase B winding, and a phase C winding, and the phase A winding, the phase B winding, and the phase C winding are all arranged on the winding column.

[0013] A further improvement to the above solution is that the phase A winding includes a plurality of phase A winding branches, the phase B winding includes a plurality of phase B winding branches, and the phase C winding includes a plurality of phase C winding branches; the phase A winding branches, the phase B winding branches, and the phase C winding branches are sequentially wound along the radial direction of the winding column until the position of the stop block.

[0014] A further improvement to the above solution is that a plurality of the phase A winding branches are connected in parallel to form the phase A winding.

[0015] A further improvement to the above solution is that a plurality of the phase B winding branches are connected in parallel to form the phase B winding.

[0016] A further improvement to the above solution is that multiple said C-phase winding branches are connected in parallel to form a C-phase winding.

[0017] A further improvement to the above solution is that an inner diameter of the rotor housing is provided with a rotor mounting platform, and the magnetic ring assembly is arranged on the rotor mounting platform. The magnetic ring assembly is composed of multiple magnetic pole pairs, each magnetic pole pair is composed of multiple magnetic steel bodies, the angle of the magnetization direction of each magnetic steel body is different, and the magnetization angle between each magnetic pole pair and the first magnetic steel body of the adjacent magnetic pole pair forms 360°.

[0018] A further improvement to the above solution is that the rotor mounting platform is provided with a magnetic steel mounting platform and a magnetic steel mounting groove. The magnetic steel mounting platform and the magnetic steel mounting groove are arranged at intervals on the rotor mounting platform and are continuously arranged on the rotor mounting platform. The magnetic steel body includes a first magnetic steel and a second magnetic steel. The first magnetic steel and the second magnetic steel are arranged at intervals. The first magnetic steel is arranged on the magnetic steel mounting platform, and the second magnetic steel is arranged on the magnetic steel mounting groove.

[0019] A further improvement to the above solution is that there are 19 magnetic pole pairs, and the 19 magnetic pole pairs are connected to form an annular magnetic ring assembly; each magnetic pole pair is provided with 6 magnetic steel bodies, and the magnetization angle between each magnet increases by 60°.

[0020] A further improvement to the above solution is that there are 19 magnetic pole pairs, and the 19 magnetic pole pairs are connected to form an annular magnetic ring assembly; each magnetic pole pair is provided with 4 magnetic steel bodies, and the magnetization angle between each magnet increases by 90°.

[0021] The beneficial effects of the present invention are as follows:

[0022] Compared with traditional motors, the present invention adopts an outer rotor motor, which can improve the efficiency of the motor. By using a Halbach array magnetic ring as the magnetic ring assembly, the magnetic field intensity of the motor can be significantly enhanced, thereby improving the power density and efficiency of the motor. At the same time, this solution also adopts a design of winding columns and winding grooves, so that the coil components can be arranged more closely together, further improving the efficiency of the motor. Since the rotor housing and the magnetic ring assembly are connected by a rotating shaft assembly, the rotor assembly can rotate stably within the fixed base, avoiding failures caused by vibration and friction. In addition, this solution also adopts a design of a fixed connection part and a rotating connection part, so that the motor can maintain stable performance under different working conditions. Due to the adoption of the design of winding columns and winding grooves, the coil components can be more evenly distributed inside the motor, thereby reducing the noise of the motor. At the same time, the stable rotation of the rotor assembly can also reduce the generation of noise.

[0023] The stator assembly adopts a distributed winding. The distributed winding design can optimize the magnetic field distribution of the motor, improve the magnetic flux efficiency, thereby reducing the internal losses of the motor and enhancing the working efficiency of the motor. For a concentrated winding motor, a distributed winding motor has a smaller resistance. Therefore, it can reach full speed faster during startup, reducing the current fluctuation and torque fluctuation during startup and improving the startup performance of the motor. The distributed winding design can make the working current of the motor in phase with the voltage, improve the power factor, reduce the reactive power loss, and help reduce the operating cost of the motor. The distributed winding design can make the motor operate more smoothly and improve the operating quality of the motor. Winding the distributed winding in multiple times can solve the problem of too long winding ends and improve the power volume and density. Description of the Drawings

[0024] Figure 1 is a three-dimensional schematic diagram of the outer-rotor permanent magnet motor of the present invention;

[0025] Figure 2 is Figure 1 the front view schematic diagram of the outer-rotor permanent magnet motor;

[0026] Figure 3 is Figure 2 the cross-sectional view taken along A-A in

[0027] Figure 4 is Figure 2 the cross-sectional view taken along B-B in

[0028] Figure 5 is Figure 1 the explosion schematic diagram of the outer-rotor permanent magnet motor;

[0029] Figure 6 is Figure 1 the three-dimensional structure schematic diagram of the outer-rotor permanent magnet motor;

[0030] Figure 7 is Figure 1 the structure schematic diagram of the stator assembly of the outer-rotor permanent magnet motor;

[0031] Figure 8 is Figure 1 the structure schematic diagram of the rotor assembly of the outer-rotor permanent magnet motor;

[0032] Figure 9 is the structure schematic diagram of an embodiment of the magnetic ring assembly of the present invention;

[0033] Figure 10 is Figure 9 the magnetization direction schematic diagram of the embodiment in

[0034] Figure 11 is the structure schematic diagram of another embodiment of the magnetic ring assembly of the present invention;

[0035] Figure 12 For Figure 11 Schematic diagram of the magnetization direction in the embodiment.

[0036] Explanation of reference numerals: fixed base 1, fixed connection part 11, connecting ring 111, limiting ring 112, first cavity 113, first electronic control board 114, driving module 1141, control module 1142, rotating connection part 12, support step 121, rotor bearing 122, second cavity 123, wire routing groove 1231, second electronic control board 124, encoder 1241, induction magnetic ring 1242, stator assembly 2, inner ring body 21, coil assembly 22, winding column 23, phase A winding 231, phase B winding 232, phase C winding 233, winding groove 24, rotor assembly 3, rotor housing 31, end cover 311, rotor mounting table 312, magnet mounting table 3121, magnet mounting groove 3122, magnetic ring assembly 32, magnet body 321, first magnet 3211, second magnet 3212, rotating shaft assembly 4, first bearing 41, second bearing 42, rotating shaft 43. Detailed implementation manners

[0037] To facilitate the understanding of the present invention, the present invention will be described more comprehensively below with reference to the relevant drawings. The preferred embodiments of the present invention are shown in the drawings. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, these embodiments are provided to make the understanding of the disclosure of the present invention more thorough and comprehensive.

[0038] It should be noted that when an element is referred to as "fixed to" another element, it can be directly on the other element or there may also be an intermediate element. When an element is considered to be "connected" to another element, it can be directly connected to the other element or there may be an intermediate element at the same time.

[0039] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the technical field to which the present invention belongs. The terms used in the specification of the present invention herein are only for the purpose of describing specific embodiments and are not intended to limit the present invention. As Figures 1 to 12As shown in the figure, in an embodiment of the present invention, an outer-rotor permanent magnet motor is involved, which includes a fixed base 1, a stator assembly 2, a rotor assembly 3, and a shaft assembly 4. The fixed base 1 includes a fixed connection portion 11 and a rotating connection portion 12; the stator assembly 2 includes an inner ring body 21 and a coil assembly 22 arranged on the fixed connection portion 11. The stator assembly 2 includes an inner ring body 21 and a plurality of winding columns 23 arranged on the outer periphery of the inner ring body 21. A winding groove 24 is arranged between two adjacent winding columns 23; the coil assembly 22 includes winding groups, and the winding groups are wound between two adjacent winding columns 23 and form a winding unit with the two adjacent winding columns 23; the rotor assembly 3 includes a rotor housing 31, and a magnetic ring assembly 32 is arranged on the rotor housing 31 facing the stator assembly 2, and the magnetic ring assembly 32 is a Halbach array magnetic ring; the shaft assembly 4 is arranged in the fixed base 1 and connected to the rotor housing 31 so that the rotor housing 31 can drive the magnetic ring assembly 32 to rotate around the stator assembly 2. The outer-rotor motor adopted in this embodiment can improve the efficiency of the motor. By using the Halbach array magnetic ring as the magnetic ring assembly 32, the magnetic field intensity of the motor can be significantly enhanced, thereby improving the power density and efficiency of the motor. At the same time, this solution also adopts the design of the winding columns 23 and the winding grooves 24, so that the coil assembly 22 can be arranged more closely together, further improving the efficiency of the motor. Since the rotor housing 31 and the magnetic ring assembly 32 are connected by the shaft assembly 4, the rotor assembly 3 can rotate stably in the fixed base 1, avoiding failures caused by vibration and friction. In addition, this solution also adopts the design of the fixed connection portion 11 and the rotating connection portion 12, so that the motor can maintain stable performance in different working states. Due to the adoption of the design of the winding columns 23 and the winding grooves 24, the coil assembly 22 can be more evenly distributed inside the motor, thereby reducing the noise of the motor. At the same time, the stable rotation of the rotor assembly 3 can also reduce the generation of noise.

[0040] In the above embodiment, the stator assembly 2 adopts a distributed winding. The distributed winding design can optimize the magnetic field distribution of the motor, improve the magnetic flux efficiency, thereby reducing the losses inside the motor and improving the working efficiency of the motor. For a concentrated winding motor, a distributed winding motor has a smaller resistance, so it can reach full speed faster during startup, reducing the current fluctuation and torque fluctuation during startup and improving the startup performance of the motor. The distributed winding design can make the working current of the motor in phase with the voltage, improve the power factor, reduce the reactive power loss, and help reduce the operating cost of the motor. The distributed winding design can make the motor run more smoothly and improve the operating quality of the motor. The distributed winding is wound in multiple times, which can solve the problem of too long winding ends and can improve the power volume and density.

[0041] The fixed connection part 11 is provided with a connection ring 111, the connection ring 111 is fixedly connected to the stator assembly 2, one side of the connection ring 111 is provided with a limit ring 112, and the limit ring 112 is used for installing and limiting the stator assembly 2. In this embodiment, the stator assembly 2 is installed through the cooperation of the connection ring 111 and the limit ring 112, so that the stator assembly 2 is fixed on the outer periphery of the fixed connection part 11 to ensure the structural stability.

[0042] On one side of the rotating connection part 12 close to the fixed connection part 11, there is a support step 121, a rotor bearing 122 is installed on the support step 121, the rotor housing 31 is provided with an end cover 311, and the rotor housing 31 is rotatably connected to the rotor bearing 122 through the end cover 311. In this embodiment, the stability and balance of the rotor housing 31 during rotation are ensured through the cooperation of the rotor bearing 122 and the end cover 311. In different embodiments, the end cover 311 can be used as an output connection part, suitable for end-face outer-rotor output. The rotor housing 31 can also be used as an output connection part, such as connecting the skeleton to form a robot joint, or used as a hub motor.

[0043] The fixed connection part 11 is provided with a first cavity 113, the rotating connection part 12 is provided with a second cavity 123, and one end of the second cavity 123 extends into the first cavity 113; a first electronic control board 114 is arranged in the first cavity 113, the first electronic control board 114 is provided with a drive module 1141 and a control module 1142, the control module 1142 is used to control the drive module 1141, and the drive module 1141 is used to drive the stator assembly 2 and the rotor assembly 3 to rotate in cooperation. In this embodiment, the drive and control modules 1142 are integrated inside the motor. The drive-control integrated motor integrates the drive and control functions, which can optimize the performance and efficiency of the motor. On the one hand, by adjusting parameters such as current, voltage, and speed in real time, more precise control can be achieved, thereby improving the operation accuracy and stability of the motor. The drive-control integrated motor can reduce the need for an external controller, thereby reducing production costs. On the second hand, the integrated control function can accelerate the response speed of the motor and improve the dynamic performance of the system. This helps to improve the dynamic response and acceleration performance of the motor, so as to meet higher application scenarios. On the third hand, through the integrated control function, the drive-control integrated motor can achieve more intelligent safety protection and fault diagnosis functions. This helps to improve the reliability and safety of the system and reduce the risk of failure.

[0044] A second electronic control board 124 is disposed in the second cavity 123. An encoder 1241 is disposed on one side of the second electronic control board 124 facing the rotating shaft assembly 4. An induction magnetic ring 1242 is installed at one end of the rotating shaft assembly 4 facing the encoder 1241. The encoder 1241 and the induction magnetic ring 1242 cooperate to sense the rotation of the rotating shaft assembly 4. In this embodiment, by providing the second electronic control board 124 and having the cooperation of the encoder 1241 and the induction magnetic ring 1242 to sense the rotation of the motor, specifically, the rotation of the rotating shaft assembly 4 is sensed.

[0045] Specifically, a wire routing groove 1231 is provided on one side of the second cavity 123. One end of the wire routing groove 1231 communicates with the first cavity 113. The second electronic control board 124 is provided with a connecting wire, and the connecting wire is connected to the first electronic control board 114 through the wire routing groove 1231. The encoder 1241 is configured to transmit the data sensed by cooperating with the induction magnetic ring 1242 to sense the rotation of the rotating shaft assembly 4 to the control module 1142. In this embodiment, the wire routing groove 1231 is provided for the routing of the connecting wire, so as to facilitate the connection and data transmission of the two electronic control boards.

[0046] The rotating shaft assembly 4 includes a first bearing 41 and a second bearing 42 installed in the second cavity 123 and a rotating shaft 43 rotatably connected to the first bearing 41 and the second bearing 42. One end of the rotating shaft 43 is fixedly connected to the rotor housing 31. In this embodiment, the two bearings are used to fix the rotating shaft 43 to ensure stability during rotation.

[0047] Refer to Figure 7 As shown, the winding groups include a phase A winding 231, a phase B winding 232, and a phase C winding 233. The phase A winding 231, the phase B winding 232, and the phase C winding 233 are all disposed on the winding column 23.

[0048] The phase A winding 231 includes a plurality of phase A winding branches. The phase B winding 232 includes a plurality of phase B winding branches. The phase C winding 233 includes a plurality of phase C winding branches. The phase A winding branches, the phase B winding branches, and the phase C winding branches are sequentially wound along the radial direction of the winding column 23 until the position of the stopper. The plurality of phase A winding branches are connected in parallel with each other to form the phase A winding 231. The plurality of phase B winding branches are connected in parallel with each other to form the phase B winding 232. The plurality of phase C winding branches are connected in parallel with each other to form the phase C winding 233. In this embodiment, the distributed winding can be wound in multiple times to solve the problem of too long winding ends and can improve the power volume density.

[0049] In the above embodiment:

[0050] The phase A winding 231 is divided into a plurality of branches A1, A2,..., An;

[0051] The B-phase winding 232 is divided into multiple branches B1, B2, …, Bn;

[0052] The C-phase winding 233 is divided into multiple branches C1, C2, …, Cn;

[0053] Wind the windings of branches A1, B1, and C1 around the iron core in sequence;

[0054] Wind the windings of branches A2, B2, and C2 around the iron core in sequence;

[0055] The multiple A-phase winding branches are connected in parallel to form the A-phase winding 231. The multiple B-phase winding branches are connected in parallel to form the B-phase winding 232. The multiple C-phase winding branches are connected in parallel to form the C-phase winding 233. In this embodiment:

[0056] Wind the windings of branches An, Bn, and Cn around the iron core in sequence;

[0057] Branches A1, A2, …, An are connected in parallel to form the A-phase winding 231;

[0058] Branches B1, B2, …, Bn are connected in parallel to form the B-phase winding 232;

[0059] Branches C1, C2, …, Cn are connected in parallel to form the C-phase winding 233.

[0060] Refer to Figure 8 As shown, the inner diameter of the rotor housing 31 is provided with a rotor mounting platform 312, and the magnetic ring assembly 32 is arranged on the rotor mounting platform 312. The magnetic ring assembly 32 is composed of multiple magnetic pole pairs. Each magnetic pole pair is composed of multiple magnetic steel bodies 321. The angle of the magnetization direction of each magnetic steel body 321 is different. The magnetization angle of the first magnetic steel body 321 of each magnetic pole pair and the adjacent magnetic pole pair forms 360°. In this embodiment, by setting the magnetic steel mounting platform and magnetic steel mounting groove on the rotor housing 31, the precise positioning and orderly arrangement of the magnetic steel assembly are realized, and the stability and consistency of the magnetization structure are improved. At the same time, the continuously arranged magnetic steel assemblies on the rotor mounting platform 312 make the magnetic field distribution more uniform and improve the magnetization efficiency. The magnetic ring assembly 32 is composed of multiple magnetic pole pairs. The angle of the magnetization direction of each magnetic steel body 321 is different, which enables the magnetic field to form a complex and orderly three-dimensional structure in space. The magnetization angle of the first magnetic steel body 321 of each magnetic pole pair forms 360°, enabling the entire magnetization structure to achieve an all-round and dead-angle-free magnetization effect. This can not only improve the magnetization effect but also effectively reduce the dead zone of the magnetic field and improve the performance and efficiency of the equipment.

[0061] In addition, the present invention improves the magnetization efficiency of the motor. By providing a rotor mounting table 312 on the inner diameter of the rotor housing 31 and arranging a magnet mounting table and a magnet mounting groove on the rotor mounting table 312, the magnet ring assembly 32 can be accurately positioned and fixed on the rotor mounting table 312. This structure ensures a tight fit between the magnet assembly and the rotor, increases the magnetic flux, and thus enhances the magnetization effect of the motor.

[0062] In the above embodiment, the toroidal Halbach magnet adopts the design of a toroidal magnet, enabling the magnetic field to be concentrated and focused throughout the toroidal structure. Compared with ordinary magnets, the toroidal magnet can generate a magnetic field with a higher intensity.

[0063] In the above embodiment, the toroidal structure of the toroidal Halbach magnet allows the magnetic field to loop in a closed toroidal path, thereby reducing the space occupied by the magnet. This makes the toroidal magnet more convenient to install and use in some applications.

[0064] In the above embodiment, due to the special design structure of the toroidal Halbach magnet, the distribution of the magnetic field in the toroidal path is relatively uniform. This means that when using the toroidal magnet, the change in the magnetic field intensity is relatively small, which is beneficial to improving the stability of the magnetic field.

[0065] In the above embodiment, the design of the toroidal Halbach magnet can generate a multi-polar magnetic field, enabling a more complex magnetic field configuration to be achieved in specific application scenarios. This provides greater flexibility and operability for experiments and applications with some special requirements.

[0066] A magnet mounting table 3121 and a magnet mounting groove 3122 are provided on the rotor mounting table 312. The magnet mounting table 3121 and the magnet mounting groove 3122 are arranged at intervals on the rotor mounting table 312 and are continuously arranged on the rotor mounting table 312. The magnet body 321 includes a first magnet 3211 and a second magnet 3212. The first magnet 3211 and the second magnet 3212 are arranged at intervals. The first magnet 3211 is arranged on the magnet mounting table 3121, and the second magnet 3212 is arranged in the magnet mounting groove 3122. In this embodiment, the first magnet 3211 and the second magnet 3212 are spaced apart and are separately installed through the magnet mounting groove 3122, which is convenient for installation and the assembly process does not interfere with each other.

[0067] Refer to Figures 9 to 12 As shown, 19 magnetic pole pairs are provided, and the 19 magnetic pole pairs are connected to form an annular magnet ring assembly 32; compared with a conventional motor, the power density is large. Due to the superposition of the parallel magnetic field and the radial magnetic field after the decomposition of the Halbach magnet ring, the magnetic field intensity on the other side is greatly increased, which can effectively reduce the volume of the motor and improve the power density of the motor.

[0068] In traditional permanent magnet motors, due to the inevitable presence of harmonics in the air-gap magnetic field, skewing is generally adopted in the stator and rotor structures to weaken its influence. In the magnetic ring assembly 32 motor, since the sinusoidal distribution degree of the air-gap magnetic field is relatively high and the harmonic content is small, skewing of the stator and rotor is not required.

[0069] The rotor can use non-ferromagnetic materials. Since the unilateral magnetic field distribution generated by the self-shielding effect of the magnets in the magnetic ring assembly 32 no longer requires the rotor to use magnetic materials to provide a path for it, this not only provides a larger selection space for rotor material selection, but also enables the system to have a lower moment of inertia and better rapid response performance.

[0070] The utilization rate of permanent magnets is high. Due to the result of the magnet magnetization in different directions in the magnetic ring assembly 32, the operating point of its permanent magnets is relatively high, generally exceeding 0.9, which improves the utilization rate of permanent magnets.

[0071] Concentrated windings can be used. In traditional permanent magnet motors, distributed windings are often used to weaken the influence of harmonic magnetomotive force. In the Halbach array motor, due to its relatively high sinusoidal distribution degree of the magnetic field, the influence of the harmonic magnetic field is small.

[0072] Refer to Figures 9 to 10 As shown, in one embodiment, each of the magnetic pole pairs is provided with 6 magnetic steel bodies 321, and the magnetization angle between each magnet increases by 60°. In this embodiment, the angle θ between the nth magnet and the central axis is θ = (n - 1) * 60°. Compared with conventional motors, the power density is large. Due to the superposition of the parallel magnetic field and the radial magnetic field after the decomposition of the Halbach magnetic ring, the magnetic field strength on the other side is greatly improved. For example, the magnetization direction of the first magnet is θ = 0°, the second is θ = 60°, the third is θ = 120°, the fourth is θ = 180°, the fifth is θ = 240°, and the sixth is θ = 300°.

[0073] Refer to Figures 11 to 12 As shown, in one embodiment, each of the magnetic pole pairs is provided with 4 magnetic steel bodies 321, and the magnetization angle between each magnet increases by 90°. In this embodiment, the angle θ between the nth magnet and the central axis is θ = (n - 1) * 90°. Compared with conventional motors, the power density is large. Due to the superposition of the parallel magnetic field and the radial magnetic field after the decomposition of the Halbach magnetic ring, the magnetic field strength on the other side is greatly improved. For example, the magnetization direction of the first magnet is θ = 0°, the second is θ = 90°, the third is θ = 180°, and the fourth is θ = 270°.

[0074] The above embodiments merely illustrate several implementation manners of the present invention. The description thereof is relatively specific and detailed, but it should not be construed as a limitation to the scope of the patent of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present invention, several variations and improvements can still be made, and these all fall within the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the appended claims.

Claims

1. An outer-rotor permanent magnet motor, characterized in that: including a fixed base, the fixed base including a fixed connection part and a rotating connection part; a stator assembly, the stator assembly including an inner ring body and a coil assembly disposed on the fixed connection part, the stator assembly including the inner ring body and a plurality of winding posts disposed on the outer periphery of the inner ring body, a winding groove being provided between two adjacent winding posts; the coil assembly including winding groups, the winding groups being wound between two adjacent winding posts and forming a winding unit with the two adjacent winding posts; a rotor assembly, the rotor assembly including a rotor housing, the rotor housing being provided with a magnetic ring assembly facing the stator assembly, the magnetic ring assembly being a Halbach array magnetic ring; and a rotating shaft assembly, the rotating shaft assembly being disposed in the fixed base and connected to the rotor housing so that the rotor housing can drive the magnetic ring assembly to rotate around the stator assembly; the fixed connection part is provided with a first cavity, the rotating connection part is provided with a second cavity, one end of the second cavity extending to the first cavity; a first electronic control board is disposed in the first cavity, the first electronic control board being provided with a driving module and a control module, the control module being used to control the driving module, the driving module being used to drive the stator assembly and the rotor assembly to rotate in cooperation; a second electronic control board is disposed in the second cavity, an encoder being disposed on one side of the second electronic control board facing the rotating shaft assembly, an induction magnetic ring being mounted at one end of the rotating shaft assembly facing the encoder, the encoder cooperating with the induction magnetic ring to sense the rotation of the rotating shaft assembly; a wire routing groove is provided on one side of the second cavity, one end of the wire routing groove communicating with the first cavity, the second electronic control board being provided with a connecting wire, the connecting wire being connected to the first electronic control board through the wire routing groove, the encoder being used to transmit the data of cooperating with the induction magnetic ring to sense the rotation of the rotating shaft assembly to the control module; the rotating shaft assembly includes a first bearing and a second bearing mounted in the second cavity and a rotating shaft rotatably connected to the first bearing and the second bearing, one end of the rotating shaft being fixedly connected to the rotor housing; the winding groups include an A-phase winding, a B-phase winding and a C-phase winding, the A-phase winding, the B-phase winding and the C-phase winding all being disposed on the winding posts; the A-phase winding includes a plurality of A-phase winding branches, the B-phase winding includes a plurality of B-phase winding branches, the C-phase winding includes a plurality of C-phase winding branches; the A-phase winding branches, the B-phase winding branches and the C-phase winding branches are sequentially wound along the radial direction of the winding posts until the position of the stopper.

2. The outer-rotor permanent magnet motor according to claim 1, characterized in that: the fixed connection part is provided with a connection ring, the connection ring being fixedly connected to the stator assembly, a limiting ring being disposed on one side of the connection ring, the limiting ring being used for installing and limiting the stator assembly; a support step is disposed on one side of the rotating connection part close to the fixed connection part, a rotor bearing being mounted on the support step, the rotor housing being provided with an end cover, the rotor housing being rotatably connected to the rotor bearing through the end cover.

3. The outer-rotor permanent magnet motor according to claim 1, characterized in that: a plurality of the A-phase winding branches are connected in parallel with each other to form an A-phase winding; a plurality of the B-phase winding branches are connected in parallel with each other to form a B-phase winding; a plurality of the C-phase winding branches are connected in parallel with each other to form a C-phase winding.

4. The outer-rotor permanent magnet motor according to claim 1, characterized in that: The inner diameter of the rotor housing is provided with a rotor mounting table, and the magnetic ring assembly is arranged on the rotor mounting table. The magnetic ring assembly is composed of a plurality of magnetic pole pairs, each magnetic pole pair is composed of a plurality of magnetic steel bodies, the angles of the magnetization directions of each magnetic steel body are different, and the magnetization angle between each magnetic pole pair and the first magnetic steel body of the adjacent magnetic pole pair forms 360°.

5. The outer-rotor permanent magnet motor according to claim 4, characterized in that: The rotor mounting table is provided with a magnetic steel mounting table and a magnetic steel mounting groove. The magnetic steel mounting table and the magnetic steel mounting groove are arranged at intervals on the rotor mounting table and are continuously arranged on the rotor mounting table. The magnetic steel body includes a first magnetic steel and a second magnetic steel. The first magnetic steel and the second magnetic steel are arranged at intervals. The first magnetic steel is arranged on the magnetic steel mounting table, and the second magnetic steel is arranged in the magnetic steel mounting groove.

6. The outer-rotor permanent magnet motor according to claim 5, characterized in that: There are 19 magnetic pole pairs, and the 19 magnetic pole pairs are connected to each other to form an annular magnetic ring assembly; each magnetic pole pair is provided with 6 magnetic steel bodies, and the magnetization angle between each magnet increases by 60°.

7. The outer-rotor permanent magnet motor according to claim 5, characterized in that: There are 19 magnetic pole pairs, and the 19 magnetic pole pairs are connected to each other to form an annular magnetic ring assembly; each magnetic pole pair is provided with 4 magnetic steel bodies, and the magnetization angle between each magnet increases by 90°.

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