Electric machine rotor and permanent magnet electric machine

Abstract

The application provides a motor rotor and a permanent magnet motor. The motor rotor comprises a rotor bushing (2), a permanent magnet (3) and an adjusting block (4), the rotor bushing (2) comprises a circumferential part (25) and a stop protruding ring (27) arranged at a first end of the circumferential part (25), a second end of the circumferential part (25) is provided with the adjusting block (4), a side of the stop protruding ring (27) facing the adjusting block (4) is provided with an elastic structure, the permanent magnet (3) is arranged at an outer periphery of the circumferential part (25) and located between the elastic structure and the adjusting block (4), and the adjusting block (4) can adjust the axial position of the permanent magnet (3). According to the motor rotor, the axial position of the permanent magnet of the motor rotor can be effectively adjusted, the circumferential dislocation of the permanent magnet is avoided, and the operation stability of the motor is improved.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of electric machines, in particular to an electric machine rotor and a permanent magnet electric machine. BACKGROUND

[0002] A permanent magnet electric machine rotor and electric machine are disclosed in the related art, a plurality of dovetail grooves are arranged on the outer surface of the rotor core, the cross section of the permanent magnet is matched with the dovetail groove, the permanent magnet is embedded and fixed in the dovetail groove, a sleeve is arranged outside, the sleeve and the rotor are filled with epoxy resin, and the sleeve is formed through high-temperature baking.

[0003] High-speed surface-mounted permanent magnet electric machines have high strength requirements for the electric machine rotor, and the prior art scheme usually adopts the mode of adding a rotor sheath outside, the scheme is complex in electric machine manufacturing process, the installation precision of the permanent magnet of the rotor is extremely high for high-precision electric machines such as electric spindles, and due to the error of the permanent magnet itself and the installation error, the permanent magnet is misaligned during electric machine manufacturing, which seriously affects the output torque of the electric machine and reduces the running stability of the electric machine. SUMMARY

[0004] Therefore, the technical problem to be solved by the application is to provide an electric machine rotor and a permanent magnet electric machine, which can effectively adjust the axial position of the permanent magnet of the electric machine rotor, avoid the circumferential misalignment of the permanent magnet, and improve the running stability of the electric machine.

[0005] In order to solve the above problems, the application provides an electric machine rotor, which comprises a rotor bushing, permanent magnets and adjusting blocks, the rotor bushing comprises a circumferential part and a stop protruding ring arranged at the first end of the circumferential part, the second end of the circumferential part is provided with the adjusting blocks, the side of the stop protruding ring facing the adjusting blocks is provided with an elastic structure, the permanent magnets are arranged on the outer periphery of the circumferential part and located between the elastic structure and the adjusting blocks, and the adjusting blocks can adjust the axial position of the permanent magnets.

[0006] Preferably, the adjusting blocks are a plurality of adjusting blocks, and each adjusting block can adjust the axial position of two adjacent permanent magnets.

[0007] Preferably, the adjusting blocks are fixedly connected to the rotor bushing through adjusting screws, the adjusting blocks have adjusting surfaces matched with the end surfaces of the permanent magnets, the adjusting surfaces on the same adjusting block are located on the same plane, and when the adjusting blocks are pressed against the second ends of the permanent magnets through the adjusting surfaces, the first ends of the permanent magnets are elastically pressed and matched with the elastic structure.

[0008] Preferably, a plurality of end clamping tables are arranged on the side of the stop protruding ring facing the adjusting blocks in the circumferential direction, the first limiting clamping grooves are formed between the end clamping tables and the circumferential part, the elastic structure is arranged between two adjacent end clamping tables, and the first ends of the permanent magnets are arranged in the first limiting clamping grooves and limited by the first limiting clamping grooves.

[0009] Preferably, a limiting boss is arranged on the circumferential part, the limiting boss extends along the axial direction of the circumferential part, the limiting boss is arranged between two adjacent permanent magnets and limits the circumferential direction of the two adjacent permanent magnets.

[0010] Preferably, the first end of the limiting boss is fixedly connected with the end clamping boss, and the adjusting block is connected to the second end of the limiting boss, and the adjusting block can adjust the axial spacing between the adjusting block and the limiting boss.

[0011] Preferably, the side of the adjusting block facing the limiting boss is provided with a limiting protrusion, and the circumferential sides of the limiting protrusion are respectively provided with a second limiting clamping groove, and the second end of the permanent magnet is limited in the second limiting clamping groove.

[0012] Preferably, the two sides of the limiting boss are respectively provided with a magnetic enhancement part, the magnetic enhancement part decreases in height along the direction away from the limiting boss, the adjacent magnetic enhancement parts are arranged at intervals, the circumferential sides of the permanent magnet are provided with a thinning part matched with the structure of the magnetic enhancement part, the thinning part is matched with the surface of the magnetic enhancement part, and the inner circumferential surface of the permanent magnet is matched with the circumferential part.

[0013] Preferably, the magnetic enhancement part is in a wedge-shaped structure with an arc-shaped outer surface.

[0014] Preferably, the two sides of the limiting protrusion are respectively provided with a magnetic enhancement part, the magnetic enhancement part decreases in height along the direction away from the limiting protrusion, and the second limiting clamping groove is formed between the magnetic enhancement part and the limiting protrusion.

[0015] Preferably, the adjusting block is provided with an adjusting hole, the adjusting hole is provided with an adjusting screw, the second end of the limiting boss is provided with a fastening hole, the adjusting screw is installed in the fastening hole, the adjusting block has an adjusting surface matched with the end surface of the permanent magnet, the adjusting surfaces on the same adjusting block are located on the same plane, and when the adjusting block is pressed against the second end of the permanent magnet through the adjusting surface, the first end of the permanent magnet is elastically pressed and matched with the elastic structure.

[0016] Preferably, the adjusting hole is located between the two magnetic enhancement parts on the same adjusting block.

[0017] Preferably, the elastic structure is an elastic sheet.

[0018] According to another aspect of the present application, a permanent magnet motor is provided, comprising a motor rotor, which is the motor rotor described above.

[0019] The motor rotor provided by the application comprises a rotor bushing, permanent magnets and an adjusting block. The rotor bushing comprises a circumferential part and a stop protruding ring arranged at the first end of the circumferential part. The second end of the circumferential part is provided with the adjusting block. The side of the stop protruding ring facing the adjusting block is provided with an elastic structure. The permanent magnets are arranged at the outer periphery of the circumferential part and between the elastic structure and the adjusting block. The adjusting block can adjust the axial position of the permanent magnets. The elastic structure is arranged between the stop protruding ring of the rotor bushing and the end face of the permanent magnet, so that the elastic contact is formed between the two. The adjusting block is arranged at the second end of the rotor bushing to adjust the axial position of the permanent magnet. The elastic structure can make the permanent magnet abut against the adjusting surface of the adjusting block, so that the axial position of each permanent magnet is ensured by the adjusting surface of the adjusting block. Due to the elastic deformation performance of the elastic structure, the axial position of the permanent magnet can be adjusted according to the stress condition. Therefore, the end face of the permanent magnet can always be attached to the adjusting surface of the adjusting block, the reliability of the axial position adjustment of the permanent magnet is realized, the circumferential dislocation of the permanent magnet is effectively avoided, and the operation stability of the motor is improved. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 The structure schematic diagram of the motor rotor of one embodiment of the application is shown in the figure.

[0021] Figure 2 The exploded structure schematic diagram of the motor rotor of one embodiment of the application is shown in the figure.

[0022] Figure 3 The three-dimensional structure schematic diagram of the rotor bushing of the motor rotor of one embodiment of the application is shown in the figure.

[0023] Figure 4 The structure schematic diagram of the rotor bushing of the motor rotor of one embodiment of the application is shown in the figure.

[0024] Figure 5 The structure schematic diagram of the permanent magnet of the motor rotor of one embodiment of the application is shown in the figure.

[0025] Figure 6 The structure schematic diagram of the elastic sheet of the motor rotor of one embodiment of the application is shown in the figure.

[0026] Figure 7 The three-dimensional structure schematic diagram of the adjusting block of the motor rotor of one embodiment of the application is shown in the figure.

[0027] Figure 8 The three-dimensional structure schematic diagram of the adjusting block of the motor rotor of one embodiment of the application is shown in the figure.

[0028] Figure 9 The magnetic field distribution schematic diagram of the motor rotor in the related art is shown in the figure.

[0029] Figure 10 The magnetic field distribution schematic diagram of the motor rotor of the embodiment of the application is shown in the figure.

[0030] Reference signs are indicated as:

[0031] 1, elastic sheet; 2, rotor bushing; 21, end clamping table; 22, limiting boss; 23, magnet enhancement part; 24, fastening hole; 25, circumferential part; 26, first limiting clamping groove; 27, stop protruding ring; 3, permanent magnet; 31, thinning part; 4, adjusting block; 41, second limiting clamping groove; 42, adjusting hole; 43, limiting protrusion; 5, adjusting screw. DETAILED DESCRIPTION

[0032] For reference Figures 1 to 8 As shown in the drawings, according to the embodiment of the present application, the motor rotor comprises a rotor bushing 2, a permanent magnet 3 and an adjusting block 4, the rotor bushing 2 comprises a circumferential part 25 and a stop protruding ring 27 arranged at the first end of the circumferential part 25, the second end of the circumferential part 25 is provided with the adjusting block 4, the side of the stop protruding ring 27 facing the adjusting block 4 is provided with an elastic structure, the permanent magnet 3 is arranged at the outer periphery of the circumferential part 25 and located between the elastic structure and the adjusting block 4, and the adjusting block 4 can adjust the axial position of the permanent magnet 3.

[0033] The motor rotor sets the elastic structure between the stop protruding ring 27 of the rotor bushing 2 and the end face of the permanent magnet 3, so that the elastic contact is formed between the two, and sets the adjusting block 4 at the second end of the rotor bushing 2 to adjust the axial position of the permanent magnet 3, which can utilize the elastic structure to make the permanent magnet 3 abut on the adjusting surface of the adjusting block 4, so as to ensure the axial position of each permanent magnet 3 through the adjusting surface of the adjusting block 4, and since the elastic deformation performance of the elastic structure can be changed according to the stress condition, the end face of the permanent magnet 3 can be ensured to always adhere to the adjusting surface of the adjusting block 4, the reliability of the axial position adjustment of the permanent magnet 3 is realized, the circumferential dislocation of the permanent magnet 3 is effectively avoided, and the motor operation stability is improved.

[0034] In one embodiment, the adjusting blocks 4 are multiple, each of which is capable of adjusting the axial position of two adjacent permanent magnets 3. In this embodiment, the permanent magnets 3 are arranged on the outer surface of the circumferential part 25 of the rotor sleeve 2, the first end face of the permanent magnet 3 is arranged between the end face of the stop protruding ring 27 of the rotor sleeve 2 and the elastic structure, the second end of the permanent magnet 3 is arranged with the adjusting block 4, and the permanent magnet 3 is fixed through the adjusting screw 5. At the same time, the thickness of the elastic structure can change according to the stress condition, so the axial position of the permanent magnet 3 can be continuously adjusted through the adjusting screw, so that the axial position of each permanent magnet 3 can be conveniently and uniformly adjusted. Since one adjusting block 4 can adjust two adjacent permanent magnets 3, similarly, one adjusting block 4 is arranged on the two sides of one permanent magnet 3, so as long as the axial position of one permanent magnet 3 is determined, the axial position of the adjusting blocks 4 on the two sides of the permanent magnet 3 is also determined, and the axial position of the other permanent magnets 3 adjacent to the permanent magnet 3 can also be adjusted uniformly through the adjusting surfaces of the two adjusting blocks 4, so that the axial positions of the permanent magnet 3 and the two permanent magnets 3 on the two sides are consistent. In this way, the axial position of the first adjusted permanent magnet 3 can be taken as a reference, the axial positions of two permanent magnets 3 can be adjusted through one adjusting block 4, and the axial positions of the other permanent magnets 3 can be sequentially adjusted to be consistent with the axial position of the first permanent magnet 3, so that the axial position of the permanent magnet 3 can be quickly adjusted, the axial error caused by the machining and assembly of the motor can be effectively compensated, the adjusting efficiency is high, the adjusting effect is good, the axial positions of the permanent magnets 3 of the motor can be effectively ensured to be consistent, and the performance of the motor is effectively improved, and the operation stability of the motor is improved.

[0035] In one of the embodiments, the adjusting block 4 can also be an integral ring structure, which can be sleeved on the circumferential part 25, so that the adjusting surfaces of the adjusting blocks 4 are consistent, the axial positions of the permanent magnets 3 can be adjusted through the adjusting block 4, and the axial positions of the permanent magnets 3 can be effectively ensured to be consistent.

[0036] In one embodiment, the adjusting block 4 is fixedly connected to the rotor sleeve 2 through the adjusting screw 5, the adjusting block 4 has an adjusting surface matched with the end face of the permanent magnet 3, the adjusting surfaces on the same adjusting block 4 are located on the same plane, and the first end of the permanent magnet 3 is elastically and tightly matched with the elastic structure when the adjusting block 4 is tightly pressed on the second end of the permanent magnet 3. In this embodiment, the elastic performance of the elastic structure can ensure that the permanent magnet 3 is effectively matched with the adjusting surface of the adjusting block 4, and the effectiveness of the axial position adjustment of the permanent magnet 3 by the adjusting block 4 is ensured.

[0037] In one embodiment, the stop protruding ring 27 is circumferentially provided with a plurality of end clamping tables 21 on one side of the adjusting block 4, and the first limiting clamping groove 26 is formed between the end clamping table 21 and the circumferential part 25. The elastic structure is arranged between the two adjacent end clamping tables 21, and the first end of the permanent magnet 3 is arranged in the first limiting clamping groove 26 and limited by the first limiting clamping groove 26. In this embodiment, the end clamping table 21 is T-shaped structure, the inner side of which is consistent with the outer side curvature of the permanent magnet 3, which can effectively limit the permanent magnet 3 in the radial direction and ensure the stability of the installation position of the permanent magnet 3.

[0038] In one embodiment, the circumferential part 25 is provided with a limiting boss 22, which extends in the axial direction of the circumferential part 25. The limiting boss 22 is arranged between the two adjacent permanent magnets 3 and limits the two adjacent permanent magnets 3 in the circumferential direction. In this embodiment, the number of limiting bosses 22 is multiple, and the multiple limiting bosses 22 are uniformly spaced along the circumferential direction of the circumferential part 25 and separate and limit the two adjacent permanent magnets 3, effectively preventing the relative movement of the permanent magnets 3 in the circumferential position.

[0039] In one embodiment, the first end of the limiting boss 22 is fixedly connected with the end clamping table 21, and the adjusting block 4 is connected to the second end of the limiting boss 22. The adjusting block 4 can adjust the axial spacing between the adjusting block 4 and the limiting boss 22. In this embodiment, the adjusting block 4 cooperates with the limiting boss 22 to adjust the axial position of the permanent magnet 3. Since the adjusting block 4 is installed on the limiting boss 22, and the limiting boss 22 is located between the two adjacent permanent magnets 3, the position of the adjusting block 4 is more matched with the position of the permanent magnet 3, which makes it more convenient to adjust the axial position of the permanent magnet 3. Moreover, the structure of the adjusting block 4 can be designed more compactly, and the structure of the adjusting block 4 can be concentrated in the position matched with the permanent magnet 3, thereby reducing the volume of the adjusting block 4.

[0040] In one embodiment, the adjusting block 4 is provided with a limiting protrusion 43 on the side facing the limiting boss 22. The circumferential two sides of the limiting protrusion 43 are respectively provided with a second limiting clamping groove 41, and the second end of the permanent magnet 3 is limited in the second limiting clamping groove 41. In this embodiment, the first limiting clamping groove 26 and the second limiting clamping groove 41 cooperate with each other to limit the permanent magnet 3 from both axial ends, which can improve the effectiveness of the circumferential and radial limitation of the permanent magnet 3, ensure that the permanent magnet 3 does not fall off during high-speed rotation of the rotor, and improve the structural stability and reliability of the permanent magnet 3.

[0041] In one embodiment, magnetizing portions 23 are respectively provided on both sides of the limiting boss 22. The height of the magnetizing portions 23 decreases along the direction away from the limiting boss 22, and adjacent magnetizing portions 23 are spaced apart. Thinning portions 31 adapted to the structure of the magnetizing portions 23 are provided on both circumferential sides of the permanent magnet 3. The thinning portions 31 are in contact with the surface of the magnetizing portions 23, and the inner circumferential surface of the permanent magnet 3 is in contact with the circumferential portion 25. In this embodiment, the surface shape of the thinning portion 31 is consistent with the surface shape of the magnetizing portion 23, so that the thinning portion 31 and the magnetizing portion 23 can be completely in contact, thereby ensuring that the magnetic lines of force of the permanent magnet 3 can pass smoothly through the magnetizing portion 23 and improve the magnetic circuit efficiency.

[0042] See also Figure 9 and Figure 10 As shown, Figure 9 The diagram shows the magnetic field distribution of a motor rotor using conventional permanent magnets. It can be seen that the magnetic flux density between the permanent magnet 3 and the rotor bushing 2 continuously increases from the center of the permanent magnet 3 towards both sides, leading to magnetic field saturation at both ends of the permanent magnet 3, and consequently causing a decrease in the motor's output torque. The magnetic field distribution diagram of the motor rotor using the embodiment of this application is shown below. Figure 10 As shown, due to the presence of the magnetizing part 23 and the thinning treatment of the position on the permanent magnet 3 that cooperates with the magnetizing part 23, the distance between the inner arc of the permanent magnet 3 and the rotor bushing 2 increases continuously from the center to both sides. Therefore, the magnetic field distribution in the circumferential direction of the motor rotor is more uniform, effectively eliminating the phenomenon of local magnetic field saturation and improving the output capacity of the motor.

[0043] In one embodiment, the magnetizing part 23 has a wedge-shaped structure with an arc-shaped outer surface. The surface shape of the thinning part 31 of the permanent magnet 3 matches the wedge-shaped structure of the magnetizing part 23 to form an arc-shaped mating surface, which can make the magnetic field change of the motor smoother and the air gap magnetic field more uniform, effectively improving the magnetic performance of the motor.

[0044] In one embodiment, magnetizing portions 23 are respectively provided on both sides of the limiting protrusion 43. The height of the magnetizing portions 23 decreases along the direction away from the limiting protrusion 43. A second limiting groove 41 is formed between the magnetizing portions 23 and the limiting protrusion 43, so that the structure of the adjusting block 4 can cooperate with the structure of the magnetizing portions 23 to form a more comprehensive and effective limiting of the permanent magnet 3, and also make the utilization efficiency of the permanent magnet 3 higher.

[0045] In one embodiment, the adjusting block 4 is provided with an adjusting hole 42, and an adjusting screw 5 is provided in the adjusting hole 42. The second end of the limiting boss 22 is provided with a fastening hole 24, and the adjusting screw 5 is installed in the fastening hole 24. The adjusting block 4 has an adjusting surface that cooperates with the end face of the permanent magnet 3. The adjusting surfaces on the same adjusting block 4 are located on the same plane. When the adjusting block 4 is pressed against the second end of the permanent magnet 3 through the adjusting surface, the first end of the permanent magnet 3 is elastically pressed and cooperated with the elastic structure.

[0046] In one embodiment, the adjusting hole 42 is located between the two magnetic enhancement portions 23 on the same adjusting block 4. In this embodiment, the adjusting hole 42 is located between the two magnetic enhancement portions 23, and the thickness of the limiting protrusion 43 at this position is the thickest, so the structural strength is the best. By arranging the adjusting hole 42 at this position, the structural influence of the adjusting hole 42 on the adjusting block 4 can be reduced, so that the adjusting block 4 still has good structural strength after the adjusting hole 42 is arranged.

[0047] In one embodiment, the elastic structure is an elastic sheet 1. In this embodiment, the outer arc of the elastic sheet 1 is a circular arc, and the inner arc is a three-segment circular arc, which is consistent with the inner arc of the permanent magnet 3. The thickness of the elastic sheet 1 is uniform, so when it is extruded by the permanent magnet 3, it can exert uniform elastic force on each position of the permanent magnet 3, ensuring that each position of the permanent magnet 3 is uniformly stressed, and can form a surface fit with the adjusting surface of the adjusting block 4, thereby more effectively ensuring the effectiveness of the axial position adjustment of the permanent magnet 3.

[0048] In other embodiments, the elastic sheet 1 can also be a corrugated sheet structure.

[0049] According to the embodiments of the present application, the permanent magnet motor includes a motor rotor, which is the motor rotor described above.

[0050] It is easy for those skilled in the art to understand that the above advantageous modes can be freely combined and superimposed without conflict.

[0051] The above is only a preferred embodiment of the present application, and is not intended to limit the present application. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present application shall be included in the protection scope of the present application. The above is only a preferred embodiment of the present application, and it should be pointed out that, for ordinary skilled in the art, without departing from the technical principles of the present application, a number of improvements and modifications can be made, and these improvements and modifications should be regarded as the protection scope of the present application.

Claims

1. A motor rotor, characterized in that, The device includes a rotor bushing (2), a permanent magnet (3), and an adjusting block (4). The rotor bushing (2) includes a circumferential portion (25) and a stop ring (27) disposed at the first end of the circumferential portion (25). An adjusting block (4) is disposed at the second end of the circumferential portion (25). An elastic structure is disposed on the side of the stop ring (27) facing the adjusting block (4). The permanent magnet (3) is disposed on the outer periphery of the circumferential portion (25) and located between the elastic structure and the adjusting block (4). The adjusting block (4) can adjust the axial position of the permanent magnet (3). There are multiple adjustment blocks (4), and each adjustment block (4) can adjust the axial position of two adjacent permanent magnets (3); The adjusting block (4) is fixedly connected to the rotor bushing (2) by adjusting screws (5). The adjusting block (4) has an adjusting surface that matches the end face of the permanent magnet (3). The adjusting surfaces on the same adjusting block (4) are located on the same plane. When the adjusting block (4) is pressed against the second end of the permanent magnet (3) by the adjusting surface, the first end of the permanent magnet (3) is elastically pressed against the elastic structure. The stop ring (27) has a plurality of end plates (21) arranged circumferentially on the side facing the adjusting block (4). The end plates (21) and the circumferential part (25) form a first limiting groove (26). The elastic structure is arranged between two adjacent end plates (21). The first end of the permanent magnet (3) is arranged in the first limiting groove (26) and is limited by the first limiting groove (26).

2. The motor rotor according to claim 1, characterized in that, A limiting boss (22) is provided on the circumferential portion (25). The limiting boss (22) extends along the axial direction of the circumferential portion (25). The limiting boss (22) is disposed between two adjacent permanent magnets (3) and circumferentially limits the two adjacent permanent magnets (3).

3. The motor rotor according to claim 2, characterized in that, The first end of the limiting boss (22) is fixedly connected to the end plate (21), and the adjusting block (4) is connected to the second end of the limiting boss (22). The adjusting block (4) can adjust the axial distance between the adjusting block (4) and the limiting boss (22).

4. The motor rotor according to claim 3, characterized in that, The adjusting block (4) is provided with a limiting protrusion (43) on the side facing the limiting protrusion (22). The limiting protrusion (43) is provided with a second limiting slot (41) on both sides of its circumference. The second end of the permanent magnet (3) is limited in the second limiting slot (41).

5. The motor rotor according to claim 2, characterized in that, The limiting boss (22) is provided with magnetizing parts (23) on both sides. The height of the magnetizing parts (23) decreases along the direction away from the limiting boss (22). The adjacent magnetizing parts (23) are spaced apart. The permanent magnet (3) is provided with thinning parts (31) on both sides of the circumference that are adapted to the structure of the magnetizing parts (23). The thinning parts (31) are in contact with the surface of the magnetizing parts (23). The inner circumferential surface of the permanent magnet (3) is in contact with the circumferential part (25).

6. The motor rotor according to claim 5, characterized in that, The magnetizing part (23) has a wedge-shaped structure with an arc-shaped outer surface.

7. The motor rotor according to claim 4, characterized in that, A magnetizing part (23) is provided on both sides of the limiting protrusion (43). The height of the magnetizing part (23) decreases along the direction away from the limiting protrusion (43). The second limiting groove (41) is formed between the magnetizing part (23) and the limiting protrusion (43).

8. The motor rotor according to claim 7, characterized in that, The adjusting block (4) is provided with an adjusting hole (42), and an adjusting screw (5) is provided in the adjusting hole (42). The second end of the limiting boss (22) is provided with a fastening hole (24). The adjusting screw (5) is installed in the fastening hole (24). The adjusting block (4) has an adjusting surface that cooperates with the end face of the permanent magnet (3). The adjusting surfaces on the same adjusting block (4) are located on the same plane. When the adjusting block (4) is pressed against the second end of the permanent magnet (3) through the adjusting surface, the first end of the permanent magnet (3) is elastically pressed against the elastic structure.

9. The motor rotor according to claim 8, characterized in that, The adjustment hole (42) is located between the two magnetizing parts (23) on the same adjustment block (4).

10. The motor rotor according to claim 1, characterized in that, The elastic structure is an elastic sheet (1).

11. A permanent magnet motor, comprising a motor rotor, characterized in that, The motor rotor is the motor rotor according to any one of claims 1 to 10.

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