Surface-mounted permanent magnet rotor and permanent magnet motor

Abstract

The application discloses a surface type permanent magnet rotor and a permanent magnet motor. The surface type permanent magnet rotor comprises a rotating body, at least one permanent magnet assembly, at least one connecting piece and two limiting pieces. The permanent magnet assembly is sleeved on the rotating body. The connecting piece is arranged between the permanent magnet assembly and the rotating body and connected with the rotating body and the permanent magnet assembly respectively. The limiting piece comprises a limiting ring and multiple connecting parts. The two limiting rings are arranged at two ends of the rotating body and are detachably connected to the rotating body through the multiple connecting parts respectively. The two limiting rings are in abutment with the permanent magnet assembly and are used for limiting the permanent magnet assembly from being separated from the connecting piece or the rotating body. The application can effectively solve the problem that the permanent magnet positioning and installation are realized by using a dovetail groove assembly mode, resulting in the problems of magnetic leakage risk or installation difficulty.

Description

Technical Field

[0001] This invention relates to the field of permanent magnet motor rotor technology, specifically to a surface-mounted permanent magnet rotor and a permanent magnet motor. Background Technology

[0002] With the continuous development of technology, the field of motors will continue to develop towards higher speeds, lighter weights, and higher torque density.

[0003] Traditional permanent magnet motor rotors use a solid shaft structure, requiring a shaft extension at the drive end. A magnetic yoke made of silicon steel sheets is fitted onto the rotor shaft, and the yoke needs to be clamped and fixed in a certain way. This structure results in a large rotor weight and moment of inertia in low-speed permanent magnet direct drive motors, affecting the control accuracy of the motor. In addition, traditional surface-mount permanent magnet synchronous motors use dovetail grooves to machine the rotor yoke for positioning and installing permanent magnets. With this structure, if the dovetail groove is too deep, the inter-pole leakage flux of the motor will be relatively large, reducing the utilization rate of the permanent magnets; if the dovetail groove is too shallow, the installation of the permanent magnet blocks will be very difficult.

[0004] Therefore, there is an urgent need for a surface-mounted permanent magnet rotor and permanent magnet motor to overcome the problems of magnetic leakage or installation difficulties caused by the positioning and installation of permanent magnets through dovetail grooves in the existing technology. Summary of the Invention

[0005] The purpose of this invention is to overcome the above-mentioned technical deficiencies and propose a surface-mounted permanent magnet rotor and permanent magnet motor to solve the technical problems of magnetic leakage risk or installation difficulties caused by the use of dovetail groove assembly for positioning and installation of permanent magnets in the prior art.

[0006] To achieve the above-mentioned technical objectives, the present invention adopts the following technical solution: In a first aspect, the present invention provides a surface-mounted permanent magnet rotor, comprising: Rotating body; At least one permanent magnet component, the permanent magnet component being sleeved on the rotating body; At least one connector is disposed between the permanent magnet assembly and the rotating body, and is connected to both the rotating body and the permanent magnet assembly; and Two limiting components are provided, each including a limiting ring and multiple connecting parts. The two limiting rings are respectively disposed at both ends of the rotating body and are detachably connected to the rotating body via the multiple connecting parts. Both limiting rings abut against the permanent magnet assembly to limit the separation of the permanent magnet assembly relative to the connecting parts or the rotating body.

[0007] In some embodiments, the rotating body includes a rotating shaft and a rotating bracket, the rotating bracket being fixedly sleeved on the rotating shaft, and the rotating bracket being hollow.

[0008] In some embodiments, there are multiple connectors, which are spaced apart along the circumferential direction of the rotating bracket and are detachably connected to the rotating bracket.

[0009] In some embodiments, the permanent magnet assembly includes a plurality of magnetic pole pieces, which are arranged sequentially along the circumferential direction of the rotating bracket and abut against each other. The magnetic pole pieces are bonded to the connector, and the magnetic poles of two adjacent magnetic pole pieces are arranged oppositely. The plurality of magnetic pole pieces are sinusoidally magnetized along the circumferential direction of the rotating bracket.

[0010] In some embodiments, at least one first connecting hole is provided on the circumferential sidewall of the rotating bracket. The connector includes a connecting plate and at least one first fastening connection portion. The connecting plate has a first through hole opposite to the first connecting hole. The first through hole has a large diameter section and a small diameter section. The small diameter section of the first through hole is disposed close to the rotating bracket relative to its large diameter section. The first fastening connection portion has a large diameter portion and a small diameter portion. The small diameter section of the first fastening connection portion passes through the large diameter section and the small diameter section of the first through hole and is detachably connected to the first connecting hole. The large diameter portion of the first fastening connection portion is built into the large diameter section of the first through hole.

[0011] In some embodiments, the magnetic pole component includes a plurality of rotor cores, which are arranged along the circumferential direction of the rotating bracket. The cross-section of the rotor core is arc-shaped, and two adjacent rotor cores are fitted together and bonded to each other. Two rotor cores located on both sides are respectively bonded to the connecting plate.

[0012] In some embodiments, there are multiple permanent magnet components, which are arranged adjacent to each other along the axial direction of the rotating shaft and abut against each other. The next adjacent permanent magnet component is offset by a preset angle relative to the previous adjacent permanent magnet component in the circumferential direction.

[0013] In some embodiments, the end of the rotating bracket is provided with a plurality of second connecting holes along its circumferential direction, and the limiting ring is provided with a second through hole opposite to the second connecting holes. The second through hole has a large diameter section and a small diameter section. The small diameter section of the second through hole is disposed close to the rotating bracket relative to its large diameter section. The connecting part has a large diameter section and a small diameter section. The small diameter section of the connecting part passes through the large diameter section and the small diameter section of the second through hole and is detachably connected to the second connecting hole. The large diameter section of the connecting part is built into the large diameter section of the second through hole.

[0014] In some embodiments, the limiting ring has an annular groove, and the bottom inner wall of the annular groove has a plurality of threaded holes. The plurality of threaded holes are distributed at guide intervals along the annular groove. The limiting member also includes a plurality of second fastening connection portions. The second fastening connection portions have a large diameter portion and a small diameter portion. The small diameter section of the second fastening connection portion is threadedly connected to the threaded hole and abuts against the rotor core.

[0015] In a second aspect, the present invention provides a permanent magnet motor, comprising: a surface-mounted permanent magnet rotor as described in any one of the above-mentioned embodiments.

[0016] Compared with the prior art, the beneficial effects of the surface-mount permanent magnet rotor and permanent magnet motor provided by the present invention include: at least one permanent magnet component is sleeved on the rotating body, a connector is disposed between the permanent magnet component and the rotating body and is connected to the rotating body and the permanent magnet component respectively, two limiting rings are disposed at both ends of the rotating body and are detachably connected to the rotating body through the connecting part, and both limiting rings abut against the permanent magnet component to limit the separation of the permanent magnet component from the connector or the rotating body. Compared to existing technologies, this invention connects the rotating body to the permanent magnet assembly by setting at least one connector on the circumferential surface of the rotating body. Simultaneously, two limiting rings are set at each end of the rotating body, detachably connected to the rotating body and abutting against the permanent magnet assembly to confine the permanent magnet assembly between the two rings, thus enhancing the connection strength between the permanent magnet assembly and the rotating body. This allows for the installation and positioning of the permanent magnet and the rotating body. The design is not only simple but also eliminates the need for slotting and assembly, solving the technical problems of magnetic leakage risk or installation difficulties caused by the use of dovetail groove assembly in existing technologies for permanent magnet positioning and installation. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of a surface-mounted permanent magnet rotor provided in an embodiment of the present invention; Figure 2 This is a schematic diagram of a surface permanent magnet rotor provided in one embodiment of the present invention from another perspective; Figure 3 This is a schematic diagram of a permanent magnet assembly connected to multiple connectors according to an embodiment of the present invention; Figure 4 This is a schematic diagram of the structure of a permanent magnet component array provided in an embodiment of the present invention; Figure 5 This is a schematic diagram of the structure of a permanent magnet component array provided in another embodiment of the present invention.

[0018] Explanation of reference numerals in the attached figures: Rotating body 100; rotating shaft 110; rotating bracket 120; permanent magnet assembly 200; magnetic pole piece 210; rotor core 211; connector 300; connecting plate 310; first fastening connection part 320; limiting piece 400; limiting ring 410; connecting part 420; second fastening connection part 430. Detailed Implementation

[0019] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0020] To address the technical problem of magnetic leakage risk or installation difficulties caused by using dovetail groove assembly for permanent magnet positioning and installation, this invention provides a surface-mounted permanent magnet rotor and permanent magnet motor. It achieves connection between the rotating body 100 and the permanent magnet assembly 200 by providing at least one connector 300 on the circumferential surface of the rotating body 100. Simultaneously, two limiting rings 410 are respectively provided at both ends of the rotating body 100. These two limiting rings 410 are detachably connected to the rotating body 100 and abut against the permanent magnet assembly 200, thereby limiting the permanent magnet assembly 200 between the two limiting rings 410 and improving the connection strength between it and the rotating body 100. This allows for the installation and positioning of the permanent magnet and the rotating body 100, resulting in a simple structure that eliminates the need for grooving and assembly.

[0021] Please see Figure 1 , Figure 2 This is a schematic diagram of a surface-mount permanent magnet rotor and a permanent magnet motor according to an embodiment of the present invention. The surface-mount permanent magnet rotor includes: a rotating body 100, at least one permanent magnet component 200, at least one connector 300, and two limiting components 400. The permanent magnet component 200 is sleeved on the rotating body 100. The connector 300 is disposed between the permanent magnet component 200 and the rotating body 100 and is connected to the rotating body 100 and the permanent magnet component 200 respectively. The limiting component 400 includes a limiting ring 410 and a plurality of connecting parts 420. The two limiting rings 410 are respectively disposed at both ends of the rotating body 100 and are detachably connected to the rotating body 100 through the plurality of connecting parts 420. Both limiting rings 410 abut against the permanent magnet component 200 to limit the separation of the permanent magnet component 200 from the connector 300 or the rotating body 100.

[0022] In this device, compared with the prior art, at least one connector 300 is provided on the circumferential surface of the rotating body 100 to achieve the connection between the rotating body 100 and the permanent magnet assembly 200. At the same time, two limiting rings 410 are respectively provided at both ends of the rotating body 100. The two limiting rings 410 are detachably connected to the rotating body 100 and abut against the permanent magnet assembly 200 to limit the permanent magnet assembly 200 between the two limiting rings 410, thereby improving the connection strength between it and the rotating body 100. This allows for the installation and positioning of the permanent magnet and the rotating body 100. The structure is not only simple, but also eliminates the need for slotting and assembly. It can solve the technical problems of leakage risk or installation difficulties caused by the use of dovetail groove assembly in the prior art for positioning and installing permanent magnets.

[0023] Furthermore, the permanent magnet component 200 here is a common and readily available permanent magnet on the market, which will not be described in detail here.

[0024] In some embodiments, the limiting ring 410 is a commercially available and readily procurable insulating material, which will not be described in detail here.

[0025] In this embodiment, as Figure 1 , Figure 2 As shown, the rotating body 100 includes a rotating shaft 110 and a rotating bracket 120. The rotating bracket 120 is fixedly sleeved on the rotating shaft 110 and is hollow.

[0026] By setting up a rotating bracket 120 for connecting and installing permanent magnets, and by making the rotating bracket 120 hollow, the total mass of the rotor can be effectively reduced.

[0027] Furthermore, the rotating bracket 120 and the rotating shaft 110 are connected by welding.

[0028] In some embodiments, the rotating bracket 120 and the rotating shaft 110 are an integral structure.

[0029] In some embodiments, the rotating bracket 120 and the rotating shaft 110 are made of high-strength carbon fiber material. Compared with non-magnetic metal materials, carbon fiber material has a higher strength-to-weight ratio and does not generate high-frequency eddy current losses. The use of carbon fiber material is a conventional feature known to those skilled in the art and will not be described in detail here.

[0030] In one embodiment, such as Figure 2 As shown, there are multiple connectors 300, which are spaced apart along the circumferential direction of the rotating bracket 120 and are detachably connected to the rotating bracket 120.

[0031] By arranging multiple connectors 300 at intervals along the outer circumferential wall of the rotating bracket 120, the connection strength between the permanent magnet assembly 200 and the rotating bracket 120 can be improved.

[0032] Furthermore, the quantity and size of the connectors 300 here are selected reasonably according to the specific application scenario, and will not be elaborated here.

[0033] In one embodiment, such as Figure 1 , Figure 3 As shown, the permanent magnet assembly 200 includes multiple magnetic pole pieces 210. The multiple magnetic pole pieces 210 are arranged sequentially along the circumferential direction of the rotating bracket 120 and abut against each other. The magnetic pole pieces 210 are bonded to the connector 300, and the magnetic poles of two adjacent magnetic pole pieces 210 are arranged oppositely. The multiple magnetic pole pieces 210 are sinusoidally magnetized along the circumferential direction of the rotating bracket 120.

[0034] By setting magnetic pole pieces 210 arranged sequentially along the circumference and with opposite magnetic poles, the requirements for high air gap magnetic flux density and low distortion rate can be met.

[0035] Furthermore, the multiple magnetic pole pieces 210 here are sinusoidally magnetized along the circumferential direction of the rotating support 120, which can directly sinusoidize the air gap magnetic flux density waveform and simultaneously meet the requirements of high air gap magnetic flux density and low distortion rate.

[0036] Furthermore, in some embodiments, the plurality of magnetic poles 210 are sinusoidally magnetized.

[0037] In one embodiment, such as Figure 2 As shown, at least one first connecting hole is provided on the circumferential sidewall of the rotating bracket 120. The connector 300 includes a connecting plate 310 and at least one first fastening connection part 320. The connecting plate 310 has a first through hole opposite to the first connecting hole. The first through hole has a large diameter section and a small diameter section. The small diameter section of the first through hole is disposed close to the rotating bracket 120 relative to its large diameter section. The first fastening connection part 320 has a large diameter section and a small diameter section. The small diameter section of the first fastening connection part 320 passes through the large diameter section and the small diameter section of the first through hole and is detachably connected to the first connecting hole. The large diameter section of the first fastening connection part 320 is built into the large diameter section of the first through hole.

[0038] The connecting plate 310 forms a detachable connection with the rotating bracket 120 through at least one first fastening connection part 320, and the large diameter part and small diameter part of the first fastening connection part 320 cooperate with the large diameter section and small diameter section of the first through hole, so that the first fastening connection part 320 can be hidden to avoid interference.

[0039] Furthermore, the connecting plate 310 here forms a rotor yoke for connecting the magnetic pole piece 210, and is used to fix and install the permanent magnet.

[0040] In addition, in some embodiments, the small-diameter section of the first fastening connection 320 has external threads, and the circumferential inner wall of the first connecting hole is provided with external threads, which can realize threaded connection, which will not be described in detail here.

[0041] In one embodiment, such as Figures 3 to 5 As shown, the magnetic pole piece 210 includes multiple rotor cores 211, which are arranged along the circumferential direction of the rotating support 120. The cross-section of the rotor core 211 is arc-shaped, and two adjacent rotor cores 211 are attached to each other and bonded to each other. Two rotor cores 211 located on both sides are bonded to the connecting plate 310 respectively.

[0042] By setting multiple rotor cells, not only can the fit between two adjacent magnetic pole pieces 210 be improved, thereby enhancing the connection strength, but the permanent magnet can also be magnetized almost sinusoidally to meet the requirements of high air gap magnetic density and low distortion rate.

[0043] Furthermore, such as Figure 4 , Figure 5 As shown, the magnetization direction of the i-th permanent magnet can be calculated and determined by the following formula: , Where p represents the number of pole pairs; + and - correspond to the outer rotor and inner rotor structures, respectively; θ represents the angle between the center line of the i-th permanent magnet and θ, which should satisfy:

[0044] Where l represents the number of rotor cores 211 in each magnetic pole piece 210.

[0045] Furthermore, the more rotor cores 211 there are in each magnetic pole piece 210, the closer it is to sinusoidal magnetization, which will not be elaborated here.

[0046] In one embodiment, such as Figure 1 As shown, there are multiple permanent magnet components 200. The multiple permanent magnet components 200 are arranged adjacent to each other along the axial direction of the rotating shaft 110 and abut against each other. The next adjacent permanent magnet component 200 is offset by a preset angle relative to the previous adjacent permanent magnet component 200 in the circumferential direction.

[0047] Multiple permanent magnet components 200 are arranged adjacent to each other along the axial direction of the rotating shaft 110, which can increase the connection strength between the permanent magnet and the rotating support 120.

[0048] Furthermore, the next adjacent permanent magnet component 200 can be offset by a preset angle relative to the previous adjacent permanent magnet component 200 in the circumferential direction to achieve a slanted stage, which has a better effect on tooth harmonics and tooth cogging torque reduction, and can meet the requirements of high air gap magnetic density and low distortion rate.

[0049] Furthermore, in some embodiments, the offset angle can be reasonably selected according to the specific use case and situation, which will not be elaborated here.

[0050] In some embodiments, multiple connecting plates 310 along the axial direction of the rotating shaft 110 are also biased in conjunction with the permanent magnet, thereby improving the connection strength between the permanent magnet assembly 200 and the rotating bracket 120.

[0051] In this embodiment, as Figure 1 , Figure 2 As shown, the end of the rotating bracket 120 is provided with a plurality of second connecting holes along its circumference. The limiting ring 410 is provided with a second through hole relative to the second connecting holes. The second through hole has a large diameter section and a small diameter section. The small diameter section of the second through hole is positioned close to the rotating bracket 120 relative to its large diameter section. The connecting part 420 has a large diameter section and a small diameter section. The small diameter section of the connecting part 420 passes through the large diameter section and the small diameter section of the second through hole and is detachably connected to the second connecting hole. The large diameter section of the connecting part 420 is built into the large diameter section of the second through hole.

[0052] By providing multiple connecting parts 420 in the circumferential direction of the limiting ring 410, a detachable connection between the limiting ring 410 and the end of the rotating bracket 120 is achieved, which facilitates installation and maintenance.

[0053] Furthermore, by having the large-diameter portion and the small-diameter portion of the second fastening connection 430 cooperate with the large-diameter section and the small-diameter section of the second through hole, the second fastening connection 430 can be concealed to avoid interference.

[0054] Furthermore, in some embodiments, the number and distribution of the connecting parts 420 can be reasonably selected according to the specific application scenario, which will not be elaborated here.

[0055] In one embodiment, such as Figure 1 , Figure 2 As shown, the limiting ring 410 has an annular groove, and the bottom inner wall of the annular groove has multiple threaded holes. The multiple threaded holes are distributed at guide intervals along the annular groove. The limiting member 400 also includes multiple second fastening connection parts 430. The second fastening connection part 430 has a large diameter part and a small diameter part. The small diameter section of the second fastening connection part 430 is threaded to the threaded hole and abuts against the rotor core 211.

[0056] By setting multiple fastening connection parts 420 threaded connection limit rings 410, pressure can be applied to the permanent magnet assembly 200 along the axial direction of the rotating shaft 110, thereby improving the connection stability of the permanent magnet assembly 200 to the rotating bracket 120.

[0057] Furthermore, by creating annular grooves, interference can be avoided and the aesthetics can be improved.

[0058] The present invention also provides a permanent magnet motor, comprising: a surface permanent magnet rotor.

[0059] Furthermore, a permanent magnet motor is assembled by assembling the stator and the surface-mounted permanent magnet rotor, which is a conventional setup known to those skilled in the art and will not be described in detail here.

[0060] Furthermore, the surface-mount permanent magnet rotor designed in this application can directly sinusoidalize the air gap magnetic flux density waveform, which can simultaneously meet the requirements of high air gap magnetic flux density and low distortion rate; the above structure can easily achieve skewed stage, effectively reducing motor tooth harmonics and torque pulsation; the above structure is simple, the process is concise, and the rotor assembly is easy to engineer.

[0061] To better understand this invention, the following is combined with... Figures 1 to 5 The technical solution of the present invention will be described in detail below: At least one permanent magnet component 200 is sleeved on the rotating body 100. A connector 300 is disposed between the permanent magnet component 200 and the rotating body 100 and is connected to the rotating body 100 and the permanent magnet component 200 respectively. Two limiting rings 410 are disposed at both ends of the rotating body 100 and are detachably connected to the rotating body 100 via multiple connecting parts 420. Both limiting rings 410 abut against the permanent magnet component 200 to limit the separation of the permanent magnet component 200 from the connector 300 or the rotating body 100. Compared with the existing technology, by setting at least one connector 300 on the circumferential surface of the rotating body 100, the connection between the rotating body 100 and the permanent magnet assembly 200 is realized. At the same time, two limiting rings 410 are respectively set at both ends of the rotating body 100. The two limiting rings 410 are detachably connected to the rotating body 100 and abut against the permanent magnet assembly 200 to limit the permanent magnet assembly 200 between the two limiting rings 410, thereby improving the connection strength between it and the rotating body 100. This can realize the installation and positioning between the permanent magnet and the rotating body 100. It is not only simple in structure, but also does not require grooving and assembly.

[0062] In the specific working process of this invention, during use, the connecting plate 310 is first detachably connected to the circumferential sidewall of the rotating bracket 120 through at least one first fastening connection part 320. Then, the sinusoidally magnetized rotor cores 211 are sequentially attached and bonded to each other, and the two rotor cores 211 located at the ends of the magnetic pole pieces 210 are bonded to the two connecting plates 310 respectively. Then, multiple magnetic pole pieces 210 with opposite magnetic properties are arranged sequentially, and adjacent magnetic pole pieces 210 are bonded together. Finally, the limiting rings 410 are detachably connected to the ends of the rotating bracket 120 through the connecting parts 420, so that the limiting rings 410 abut against the multiple permanent magnet components 200. At the same time, the multiple axially distributed permanent magnet components 200 are abutted together by the second fastening connection part 430 to improve the connection stability.

[0063] Furthermore, the permanent magnet assembly 200 is arranged along the axial direction of the rotating shaft 110 and the next adjacent permanent magnet assembly 200 is offset by a preset angle relative to the previous adjacent permanent magnet assembly 200 in the circumferential direction. The offset can form a skewed pole, which not only has a better tooth harmonic and tooth cogging torque reduction effect, but also meets the requirements of high air gap magnetic density and low distortion rate.

[0064] Furthermore, the surface-mount permanent magnet rotor designed in this application can directly sinusoidalize the air gap magnetic flux density waveform, which can simultaneously meet the requirements of high air gap magnetic flux density and low distortion rate; the above structure can easily achieve skewed stage, effectively reducing motor tooth harmonics and torque pulsation; the above structure is simple, the process is concise, and the rotor assembly is easy to engineer.

[0065] This application, through the aforementioned structure, can solve the technical problem in the prior art where the use of dovetail groove assembly for positioning and installing permanent magnets leads to the risk of magnetic leakage or installation difficulties.

[0066] The specific embodiments of the present invention described above do not constitute a limitation on the scope of protection of the present invention. Any other corresponding changes and modifications made in accordance with the technical concept of the present invention should be included within the scope of protection of the claims of the present invention.

Claims

1. A surface-mounted permanent magnet rotor, characterized in that, include: Rotating body; At least one permanent magnet component, the permanent magnet component being sleeved on the rotating body; At least one connector is disposed between the permanent magnet assembly and the rotating body, and is connected to both the rotating body and the permanent magnet assembly respectively; as well as Two limiting components are provided, each including a limiting ring and multiple connecting parts. The two limiting rings are respectively disposed at both ends of the rotating body and are detachably connected to the rotating body via the multiple connecting parts. Both limiting rings abut against the permanent magnet assembly to limit the separation of the permanent magnet assembly relative to the connecting parts or the rotating body.

2. The surface-mounted permanent magnet rotor according to claim 1, characterized in that, The rotating body includes a rotating shaft and a rotating bracket. The rotating bracket is fixedly sleeved on the rotating shaft and is hollow.

3. The surface-mounted permanent magnet rotor according to claim 2, characterized in that, The number of connectors is multiple, and the multiple connectors are spaced apart along the circumferential direction of the rotating bracket, and are detachably connected to the rotating bracket respectively.

4. The surface-mounted permanent magnet rotor according to claim 2, characterized in that, The permanent magnet assembly includes multiple magnetic pole pieces, which are arranged sequentially along the circumference of the rotating bracket and abut against each other. The magnetic pole pieces are bonded to the connecting piece, and the magnetic poles of two adjacent magnetic pole pieces are arranged in opposite directions. The multiple magnetic pole pieces are sinusoidally magnetized along the circumference of the rotating bracket.

5. The surface-mounted permanent magnet rotor according to claim 4, characterized in that, At least one first connecting hole is provided on the circumferential sidewall of the rotating bracket. The connecting member includes a connecting plate and at least one first fastening connecting part. The connecting plate has a first through hole opposite to the first connecting hole. The first through hole has a large diameter section and a small diameter section. The small diameter section of the first through hole is located close to the rotating bracket relative to its large diameter section. The first fastening connecting part has a large diameter section and a small diameter section. The small diameter section of the first fastening connecting part passes through the large diameter section and the small diameter section of the first through hole and is detachably connected to the first connecting hole. The large diameter section of the first fastening connecting part is built into the large diameter section of the first through hole.

6. The surface-mounted permanent magnet rotor according to claim 5, characterized in that, The magnetic pole component includes multiple rotor cores, which are arranged along the circumferential direction of the rotating bracket. The cross-section of each rotor core is arc-shaped, and adjacent rotor cores are attached to each other and bonded together. Two rotor cores located on both sides are bonded to the connecting plate respectively.

7. The surface-mounted permanent magnet rotor according to claim 6, characterized in that, The number of permanent magnet components is multiple, and the multiple permanent magnet components are arranged adjacent to each other along the axial direction of the rotating shaft and abut against each other. The next adjacent permanent magnet component is offset by a preset angle relative to the previous adjacent permanent magnet component in the circumferential direction.

8. The surface-mounted permanent magnet rotor according to claim 6, characterized in that, The rotating bracket has multiple second connecting holes along its circumference at its end. The limiting ring has a second through hole opposite to the second connecting hole. The second through hole has a large diameter section and a small diameter section. The small diameter section of the second through hole is positioned close to the rotating bracket relative to its large diameter section. The connecting part has a large diameter section and a small diameter section. The small diameter section of the connecting part passes through the large diameter section and the small diameter section of the second through hole and is detachably connected to the second connecting hole. The large diameter section of the connecting part is built into the large diameter section of the second through hole.

9. The surface-mounted permanent magnet rotor according to claim 8, characterized in that, The limiting ring has an annular groove, and the bottom inner wall of the annular groove has multiple threaded holes. The multiple threaded holes are distributed at guide intervals along the annular groove. The limiting member also includes multiple second fastening connection parts. The second fastening connection parts have a large diameter part and a small diameter part. The small diameter section of the second fastening connection part is threaded to the threaded hole and abuts against the rotor core.

10. A permanent magnet motor, characterized in that, include: The surface-mounted permanent magnet rotor as described in any one of claims 1 to 9.

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