Disc type motor rotor and disc type motor

Abstract

The utility model relates to the technical field of motors, and discloses a disc type motor rotor and a disc type motor. The disc type motor comprises a stator and a disc type motor rotor, the disc type motor rotor comprises a plurality of permanent magnet assemblies and a plurality of magnetic conductive blocks, the permanent magnet assemblies and the magnetic conductive blocks are alternately arranged in the circumferential direction, the permanent magnet assemblies are magnetized in the tangential direction, and the magnetic poles of the adjacent permanent magnet assemblies are opposite; p is the number of magnetic pole pairs of the disc type motor, A is a constant, and A is larger than or equal to 15% and smaller than or equal to 20%. According to the disc type motor rotor provided by the utility model, the size of the permanent magnet assembly is reasonably set, so that the disc type motor has relatively high reluctance torque.

Description

Technical Field

[0001] The utility model relates to the technical field of motors, in particular to a disc motor rotor and a disc motor. Background Art

[0002] The disc motor has the advantages of compact structure, high power density and torque density, high acceleration and response speed, etc., and is widely used in the fields of automobiles, industrial automation, etc.

[0003] The disc motor includes a stator and a rotor. The stator includes a stator core and a stator winding. After the stator winding is energized, it can generate axial magnetic lines of force. The rotor includes a magnetic conductor permanent magnet assembly, and the magnetic conductors and the permanent magnet assembly are arranged alternately in the circumferential direction. In some existing solutions, the permanent magnet assembly is magnetized tangentially, and in cooperation with the axial magnetic lines of force, the disc motor has both a permanent magnet torque and a reluctance torque. Therefore, when the maximum torque of the disc motor is the same, the amount of the permanent magnet assembly can be saved, which can not only reduce the cost of the disc motor, but also improve the high-speed performance of the disc motor. The higher the reluctance torque, the better the effect of reducing the cost and improving the high-speed performance of the disc motor. However, how to make the disc motor have a higher reluctance torque is still an urgent problem to be solved. Summary of the Utility Model

[0004] An object of the utility model is to provide a disc motor rotor, which enables the disc motor to have a higher reluctance torque by reasonably setting the size of the permanent magnet assembly.

[0005] To achieve the above object, the utility model adopts the following technical solutions:

[0006] The disc motor rotor includes:

[0007] A plurality of permanent magnet assemblies and a plurality of magnetic conductor blocks, the permanent magnet assemblies and the magnetic conductor blocks are arranged alternately in the circumferential direction, the permanent magnet assemblies are magnetized tangentially, and the magnetic poles of adjacent permanent magnet assemblies are opposite;

[0008] The central angle corresponding to the width of the midpoint of the permanent magnet assembly in the radial direction is α, Where:

[0009] P is the number of pole pairs of the disc motor, A is a constant, and 15% ≤ A ≤ 20%.

[0010] As an optional solution, the size of the permanent magnet assembly in the first direction is D, the first direction is parallel to the axial direction, the maximum size of the permanent magnet assembly in the second direction is B, the second direction is perpendicular to the axial direction and the radial direction respectively, and the ratio of the size D to the size B is 0.8-1.2.

[0011] As an optional solution, the permanent magnet assembly includes one permanent magnet; or

[0012] The permanent magnet assembly includes a plurality of permanent magnets and a plurality of magnetic conduction members, and the permanent magnets and the magnetic conduction members are alternately arranged in the circumferential direction.

[0013] As an alternative solution, it includes:

[0014] A back plate, made of non-magnetic conduction material, and a plurality of slots are arranged at intervals along its circumferential direction;

[0015] A plurality of magnetic conduction blocks, each magnetic conduction block is inserted into the slot in the radial direction and is axially limited with the back plate, and a limiting groove is formed between adjacent magnetic conduction blocks;

[0016] A plurality of permanent magnet assemblies, each permanent magnet assembly is inserted into the limiting groove in the radial direction, so that the groove wall of the limiting groove axially presses the corresponding permanent magnet assembly against the back plate.

[0017] As an alternative solution, the back plate includes a plate body and an annular stop rib, a plurality of the slots are all arranged on the plate body, the annular stop rib is erected on one side of the plate body, and the inner circumferential surface of the permanent magnet assembly and the inner circumferential surface of the magnetic conduction block are both abutted against the annular stop rib;

[0018] The disc motor rotor further includes a retaining ring, the retaining ring is made of non-magnetic conduction material, the retaining ring surrounds the outer periphery of the back plate, and the outer circumferential surface of the magnetic conduction block and the outer circumferential surface of the permanent magnet assembly are both abutted against the retaining ring.

[0019] As an alternative solution, it includes:

[0020] A back plate, made of non-magnetic conduction material;

[0021] A plurality of magnetic conduction blocks, installed on the same side of the back plate, the plurality of magnetic conduction blocks are arranged at intervals in the circumferential direction, and a limiting groove is formed between adjacent magnetic conduction blocks;

[0022] A plurality of permanent magnet assemblies, each permanent magnet assembly is inserted into one of the limiting grooves in the radial direction, and the groove wall of the limiting groove axially presses the corresponding permanent magnet assembly against the back plate.

[0023] As an alternative solution, it further includes:

[0024] A pressing plate, made of non-magnetic conduction material, the pressing plate is connected to the back plate, and the inner circumferential surface of the magnetic conduction block and the inner circumferential surface of the permanent magnet assembly are both abutted against the pressing plate; and / or

[0025] A retaining ring, made of non-magnetic conduction material, the retaining ring surrounds the outer periphery of the back plate, and the outer circumferential surface of the magnetic conduction block and the outer circumferential surface of the permanent magnet assembly are both abutted against the retaining ring.

[0026] As an alternative solution, it includes:

[0027] A back plate made of non-magnetic conductive material;

[0028] A plurality of magnetic conductive blocks and a plurality of permanent magnet assemblies, which are arranged on the same side of the back plate and alternately arranged along the circumferential direction of the back plate. First grooves and second grooves are respectively arranged on the surfaces of the magnetic conductive blocks and the permanent magnet assemblies facing each other, and the first grooves and the second grooves enclose and form a positioning groove extending radially;

[0029] A plurality of connecting pieces, each of which is correspondingly inserted into one of the positioning grooves and fixedly connected to the back plate.

[0030] Another object of the present utility model is to provide a disc motor, which has a high reluctance torque by setting the above-mentioned disc motor torque, and has low manufacturing cost and good high-speed performance when the total output torque is certain.

[0031] To achieve this purpose, the present utility model adopts the following technical solutions:

[0032] A disc motor, including a stator and the above-mentioned disc motor rotor, and the stator and the disc motor rotor are arranged circumferentially.

[0033] As an alternative solution, the pole-slot matching of the stator is N slots and N poles, where N is a positive integer.

[0034] The beneficial effects of the present utility model are:

[0035] The disc motor rotor of the present utility model includes a plurality of alternately arranged permanent magnet assemblies and magnetic conductive blocks, and the permanent magnet assemblies are magnetized tangentially, so that a reluctance torque can be generated when the disc motor operates. By setting the central angle α corresponding to the circumference at the midpoint of the permanent magnet assembly along the radial direction to be, And 15% ≤ A ≤ 20%, the disc motor rotor and the stator can have a high reluctance torque after being matched.

[0036] The disc motor of the present utility model has a high reluctance torque by setting the above-mentioned disc motor torque, and has low manufacturing cost and good high-speed performance when the total output torque is certain. Description of the Drawings

[0037] Figure 1 It is a schematic structural diagram of the disc motor provided in Embodiment 1 of the present utility model;

[0038] Figure 2 It is a front view of the disc motor rotor provided in Embodiment 1 of the present utility model;

[0039] Figure 3It is an exploded view of a disc-type motor rotor provided in the first embodiment of the present utility model;

[0040] Figure 4 It is a schematic structural diagram of a back plate provided in the first embodiment of the present utility model;

[0041] Figure 5 It is a schematic structural diagram of a magnetic conduction block provided in the first embodiment of the present utility model;

[0042] Figure 6 It is a front view of a disc-type motor rotor provided in the second embodiment of the present utility model;

[0043] Figure 7 It is an exploded view of a disc-type motor rotor provided in the second embodiment of the present utility model from one perspective;

[0044] Figure 8 It is an exploded view of a disc-type motor rotor provided in the second embodiment of the present utility model from another perspective;

[0045] Figure 9 It is a front view of a disc-type motor rotor provided in the third embodiment of the present utility model;

[0046] Figure 10 It is an exploded view of a disc-type motor rotor provided in the third embodiment of the present utility model;

[0047] Figure 11 It is Figure 10 the enlarged view of part A in

[0048] In the figure:

[0049] 10. Disc-type motor rotor; 11. Back plate; 110. Limiting groove; 111. Plate body; 112. Annular stop rib; 113. Slot; 114. Main body plate; 115. Inner ring limiting plate; 1151. First threaded hole; 116. Outer ring limiting plate; 1161. Second threaded hole; 117. Second dovetail groove; 118. Central hole; 12. Magnetic conduction block; 121. First limiting plate; 1211. First side; 1212. Second side; 122. Connecting plate; 123. Second limiting plate; 124. First groove; 125. First dovetail groove; 126. First side wall; 127. Second side wall; 128. Second pressing inclined surface; 13. Permanent magnet assembly; 131. Second groove; 14. Retaining ring; 15. Pressing plate; 151. Contact surface; 152. First pressing inclined surface; 16. Connecting piece; 17. Positioning groove; 18. Inserting piece;

[0050] 20. Stator;

[0051] 30. Output shaft. Specific embodiments

[0052] The present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It can be understood that the specific embodiments described herein are only used to explain the present utility model, rather than limiting the present utility model. In addition, it should be noted that for the convenience of description, only the parts related to the present utility model rather than all the structures are shown in the drawings.

[0053] In the description of the present utility model, unless otherwise clearly defined and limited, the terms "connected", "connected to", and "fixed" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, and can be the communication inside two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific situations.

[0054] In the present utility model, unless otherwise clearly defined and limited, the first feature being "above" or "below" the second feature may include the direct contact between the first and second features, or may include the situation where the first and second features are not in direct contact but in contact through other features therebetween. Moreover, the first feature being "above", "above and to the right", and "on the top" of the second feature includes that the first feature is directly above and obliquely above the second feature, or simply means that the horizontal height of the first feature is higher than that of the second feature. The first feature being "below", "below and to the left", and "underneath" the second feature includes that the first feature is directly below and obliquely below the second feature, or simply means that the horizontal height of the first feature is lower than that of the second feature.

[0055] In the description of this embodiment, the orientation or positional relationships such as "above", "below", "right", etc. are based on the orientation or positional relationship shown in the drawings. It is only for the convenience of description and simplifying the operation, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus cannot be understood as a limitation to the present utility model. In addition, the terms "first" and "second" are only used for distinction in description and have no special meanings.

[0056] Embodiment 1

[0057] This embodiment provides a disc-type motor rotor and a disc-type motor. As Figure 1 shown, the disc-type motor includes a disc-type motor rotor 10, a stator 20, and an output shaft 30. The stator 20 and the disc-type motor rotor 10 are arranged axially (i.e., the X direction in the figure), and the output shaft 30 is connected to the rotor. When the motor operates, after the stator 20 is energized, a magnetic field is generated, and the disc-type motor rotor 10 drives the output shaft 30 to rotate under the action of the magnetic field.

[0058] In this embodiment, the disc motor includes a stator 20 and two disc motor rotors 10. The two disc motor rotors 10 are respectively arranged on both sides of the stator 20. The output shaft 30 penetrates through the stator 20 and is respectively connected to the two disc motor rotors 10 at both ends. In some embodiments, the disc motor includes one disc motor rotor 10 and two stators 20. The two stators 20 are respectively arranged on both sides of the disc motor rotor 10. In other embodiments, the disc motor may also include only one disc motor rotor 10 and one stator 20.

[0059] As Figure 2 shown, the disc motor rotor 10 includes a plurality of magnetic conduction blocks 12 and a plurality of permanent magnet assemblies 13. The magnetic conduction blocks 12 and the permanent magnet assemblies 13 are arranged alternately in the circumferential direction. The adjacent magnetic conduction blocks 12 and the permanent magnet assemblies 13 are in contact with each other. The permanent magnet assemblies 13 are magnetized tangentially, and the magnetic pole directions of the adjacent permanent magnet assemblies 13 are opposite. Therefore, in cooperation with the magnetic force lines in the axial direction of the stator 20, the disc motor has both a permanent magnet torque and a reluctance torque. When the maximum torque of the disc motor is the same, the amount of permanent magnets can be saved, which can not only reduce the cost of the disc motor, but also improve the high-speed performance of the disc motor. Optionally, the magnetic conduction blocks 12 can be made of materials with good magnetic conduction performance such as silicon steel sheets, SMC materials, steel, iron, amorphous alloys, etc. Optionally, in some embodiments, the permanent magnet assembly 13 includes one permanent magnet. In some embodiments, the permanent magnet assembly 13 includes a plurality of permanent magnets and a plurality of magnetic conductors. The magnetic pole directions of the plurality of permanent magnets are the same, and the permanent magnets and the magnetic conductors are arranged alternately in the circumferential direction to form an integral permanent magnet assembly 13.

[0060] Preferably, the pole-slot combination of the stator 20 is 9N slots and 2N poles, where N is a positive integer. By setting the stator 20 to the above-mentioned pole-slot combination, the disc motor can have a higher reluctance torque, thereby further reducing the manufacturing cost of the disc motor and improving the high-speed performance of the disc motor. Optionally, N can be 1, 2, 3, 4, and the corresponding pole-slot combinations are 9 slots and 2 poles, 18 slots and 4 poles, 27 slots and 6 poles, 36 slots and 8 poles. Of course, the value of N can also be 5 or larger, which is not specifically limited here. It should be noted that the stator 20 can obtain the above-mentioned pole-slot combination by selecting an appropriate winding method, and the corresponding winding method is the prior art and will not be elaborated here.

[0061] Preferably, the central angle corresponding to the circumference at the midpoint of the permanent magnet assembly 13 in the radial direction is α, where P is the number of pole pairs of the disc motor, and A is a constant, 15% ≤ A ≤ 20%. By setting the parameters of the permanent magnet assembly 13 within the above range, the disc motor has a higher reluctance torque, and thus when the total output torque is constant, the manufacturing cost and high-speed performance of the disc motor can be reduced. On the contrary, when the manufacturing costs are the same, the disc motor can have a higher output torque.

[0062] Preferably, the dimension of the permanent magnet assembly 13 in the first direction is D, the first direction is parallel to the axial direction, the maximum dimension of the permanent magnet assembly 13 in the second direction is B, the second direction is perpendicular to the axial direction and the radial direction respectively, and the ratio of the dimension D to the dimension B is 0.8 - 1.2. By setting the parameters of the permanent magnet assembly 13 within the above range, the reluctance torque of the disc motor can be further improved, thereby reducing the manufacturing cost of the disc motor and improving the high-speed performance of the disc motor. It should be noted that the permanent magnet assembly 13 is circumferentially

[0063] In this embodiment, the permanent magnet assembly 13 has a cylindrical structure, the height of the cylindrical structure is parallel to the radial direction, and the cross-section is perpendicular to the radial direction. In some embodiments, the cross-section of the cylindrical structure is rectangular, and the dimensions D and B are respectively the two side lengths of the rectangle. In some embodiments, the cross-section of the cylindrical structure is trapezoidal, the dimension D is the height of the trapezoid, and the dimension B is the lower base of the trapezoid.

[0064] Since the permanent magnet assembly 13 is tangentially magnetized and the permanent magnet assembly 13 is disposed close to the magnetic conduction block 12, it is necessary to ensure that adjacent magnetic conduction blocks 12 cannot be connected by magnetic conduction materials, otherwise it will cause a short circuit of the permanent magnet assembly 13. In the prior art, connection structures are usually provided for each permanent magnet and magnetic conductor one by one, resulting in a complex structure of the disc motor rotor and low assembly efficiency.

[0065] As Figures 2 - 4 shown, the disc motor rotor 10 further includes a back plate 11, and the back plate 11 is made of non-magnetic conductive material. The back plate 11 is generally in a ring structure, and a plurality of slots 113 are provided at intervals along the circumferential direction of the back plate 11, and the slots 113 penetrate radially to the outer circumferential surface of the back plate 11. Each magnetic conduction block 12 is inserted into the slot 113 along the radial direction and is axially limited with the back plate 11, and a limiting groove 110 is formed between adjacent magnetic conduction blocks 12. Each permanent magnet assembly 13 is inserted into the limiting groove 110 along the radial direction, so that the groove wall of the limiting groove 110 presses the corresponding permanent magnet assembly 13 against the back plate 11 along the axial direction.

[0066] For the disc motor rotor 10 of this embodiment, the magnetic conduction block 12 can achieve axial limitation with the back plate 11 by being inserted and matched with the slot 113 on the back plate 11, and the permanent magnet assembly 13 can be axially pressed against the back plate 11 through the limiting groove 110 formed by adjacent magnetic conduction blocks 12, that is, the magnetic conduction block 12 itself constitutes an axial constraint structure for the permanent magnet assembly 13, thereby simplifying the overall connection structure of the disc motor rotor 10 and having high assembly efficiency. And the back plate 11 is made of non-magnetic conductive material, so the problem of magnetic circuit short circuit between adjacent permanent magnet assemblies 13 can be avoided.

[0067] In this embodiment, the back plate 11 is preferably made of a high-strength non-magnetic material to prevent the back plate 11 from deforming during the operation of the motor. Optionally, the back plate 11 can be made of materials such as titanium alloy, aluminum alloy, glass fiber, carbon fiber, etc.

[0068] To axially fix the magnetic conduction block 12 and the permanent magnet assembly 13, as Figure 3 and 4 shown, the back plate 11 includes a plate body 111 and an annular stop rib 112. A plurality of slots 113 are provided on the plate body 111. The annular stop rib 112 is erected on one side of the plate body 111. The inner circumferential surface of the permanent magnet assembly 13 and the inner circumferential surface of the magnetic conduction block 12 are both abutted against the annular stop rib 112, so as to realize the limit of the permanent magnet assembly 13 and the magnetic conduction block 12 at the radially inner end. The disc-type motor rotor 10 further includes a retaining ring 14, which is also made of a non-magnetic material. The retaining ring 14 surrounds the outer circumference of the back plate 11. The outer circumferential surface of the magnetic conduction block 12 and the outer circumferential surface of the permanent magnet assembly 13 are both abutted against the retaining ring 14, so as to realize the limit of the magnetic conduction block 12 and the permanent magnet assembly 13 at the radially outer end. That is to say, through the structure of the back plate 11 itself and the retaining ring 14, the radial limits of the magnetic conduction block 12 and the permanent magnet assembly 13 can be realized. In summary, the magnetic conduction block 12, the permanent magnet assembly 13, the back plate 11 and the retaining ring 14 can be fixedly installed only by mechanical cooperation, without the need for additional fasteners or glue, which can not only improve the convenience of assembling the disc-type motor rotor 10, but also improve the assembly efficiency. In this embodiment, the annular stop rib 112 and the plate body 111 can be integrally formed or formed by connecting two components, which is not limited herein. As Figure 4 shown, a central hole 118 is also provided on the plate body 111. The central hole 118 is coaxially arranged with the annular stop rib 112, and the central hole 118 is used for installing the output shaft 30.

[0069] Optionally, the retaining ring 14 can be made of materials such as titanium alloy, aluminum alloy, glass fiber, carbon fiber, etc. Preferably, the retaining ring 14 provides a radial clamping force on the magnetic conduction block 12 and the permanent magnet assembly 13. Therefore, when the motor rotates, this radial clamping force can balance the centrifugal forces of the magnetic conduction block 12 and the permanent magnet assembly 13, prevent the magnetic conduction block 12 or the permanent magnet assembly 13 from being thrown out during rotation, ensure the stable positions of the permanent magnet assembly 13 and the magnetic conduction block 12, and further enable the disc-type motor rotor 10 to adapt to higher-speed rotation. In some embodiments, the radial clamping force provided by the retaining ring 14 on the magnetic conduction block 12 is greater than the centrifugal force it receives at the highest rotational speed of the rotor, and the radial clamping force provided by the retaining ring 14 on the permanent magnet assembly 13 is greater than the centrifugal force it receives when rotating at the highest rotational speed of the rotor.

[0070] In this embodiment, the retaining ring 14 is made of carbon fiber material. Based on this, the retaining ring 14 can be installed on the back plate 11 in one of the following ways: first, the carbon fiber impregnated with the matrix material (which can be epoxy resin) is wound layer by layer to the periphery of the intermediate component (a component composed of the back plate 11, multiple magnetic blocks 12 and multiple permanent magnet components 13) with a preset tension force, and then heated and cured to form after the winding is completed. Second, the retaining ring 14 is directly formed first, and then the retaining ring 14 and the intermediate component are cold-installed in a liquid nitrogen environment, so as to ensure that after returning to normal temperature, the retaining ring 14 and the intermediate component are matched in an interference fit manner, so that the retaining ring 14 can provide sufficient radial clamping force to the magnetic blocks 12 and the permanent magnet components 13.

[0071] like Figures 3 - 5 As shown, both ends of the slot 113 along the axial direction pass through the back plate 11, and the magnetic block 12 includes a first limit plate 121, a connecting plate 122 and a second limit plate 123. The first limit plate 121 and the second limit plate 123 are arranged opposite to each other, and the connecting plate 122 is connected between the first limit plate 121 and the second limit plate 123. The connecting plate 122 is inserted into the slot 113, and the first limit plate 121 and the second limit plate 123 are respectively abutted against the two sides of the back plate 11, and a limit groove 110 is formed between the first limit plates 121 of adjacent magnetic blocks 12. The magnetic block 12 forms an "I"-shaped structure. On the one hand, the magnetic block 12 can achieve axial limitation after cooperating with the back plate 11; on the other hand, the first limiting plate 121 and the second limiting plate 123 can support both sides of the back plate 11, thereby reducing the risk of deformation of the back plate 11; on the other hand, the setting of the second limiting plate 123 is equivalent to adding a counterweight to the side of the back plate 11 away from the permanent magnet assembly 13. Therefore, during the high-speed rotation of the motor, the back plate 11 can be prevented from bending and deforming toward the side away from the permanent magnet assembly 13, thereby ensuring the position accuracy of the permanent magnet assembly 13 and improving the service life of the rotor.

[0072] It is understandable that the thickness, width, shape and other parameters of the second limiting plate 123 can be flexibly set according to the required counterweight weight, and are not specifically limited here.

[0073] In order to enable the groove wall of the limiting groove 110 to press the corresponding permanent magnet assembly 13 against the back plate 11 along the axial direction, as shown in FIG. Figure 3As shown in the figure, on both sides of the first limiting plate 121 in the circumferential direction, a first side surface 1211 and a second side surface 1212 are respectively provided. The first side surface 1211, the second side surface 1212 of the adjacent first limiting plate 121, and the back plate 11 enclose a limiting groove 110. The cross-section of the permanent magnet assembly 13 has the same shape and size as the cross-section of the limiting groove 110. At least one of the first side surface 1211 and the second side surface 1212 is an inclined surface. Therefore, along the axial direction and away from the back plate 11, the dimension of the limiting groove 110 in the circumferential direction gradually decreases, so that the first side surface 1211 and / or the second side surface 1212 can axially press the permanent magnet assembly 13 against the back plate 11.

[0074] In this embodiment, the first side surfaces 1211 and the second side surfaces 1212 of two adjacent first limiting plates 121 are opposite to each other and are both inclined surfaces. At this time, the cross-section of the limiting groove 110 is trapezoidal, and both ends of the permanent magnet assembly 13 in the circumferential direction are pressed by the first side surface 1211 and the second side surface 1212 respectively, ensuring that the permanent magnet assembly 13 is firmly installed and uniformly stressed. In other embodiments, only the first side surface 1211 or the second side surface 1212 that encloses the limiting groove 110 can be set as an inclined surface. At this time, the cross-section of the limiting groove 110 is a right trapezoid.

[0075] Embodiment Two

[0076] This embodiment provides a disc-type motor rotor 10, and the main difference from the disc-type motor rotor 10 in Embodiment One lies in the specific connection methods of structures such as the permanent magnet assembly 13, the magnetic conduction block 12, and the back plate 11, which are as follows:

[0077] In this regard, as Figures 6 - 8 shown, the disc-type motor rotor 10 further includes a back plate 11 made of non-magnetic conductive material. A plurality of magnetic conduction blocks 12 are installed on the same side of the back plate 11. The plurality of magnetic conduction blocks 12 are arranged at intervals in the circumferential direction, and a limiting groove 110 is formed between adjacent magnetic conduction blocks 12. Each permanent magnet assembly 13 is inserted into a limiting groove 110 in the radial direction, and the groove wall of the limiting groove 110 axially presses the corresponding permanent magnet against the back plate 11. For the disc-type motor rotor 10 in this embodiment, the magnetic conduction block 12 itself constitutes an axial constraint structure for the permanent magnet assembly 13, which can simplify the overall connection structure of the disc-type motor rotor 10, and has high assembly efficiency. Moreover, since the back plate 11 is made of non-magnetic conductive material, the problem of magnetic circuit short circuit between adjacent permanent magnet assemblies 13 can be avoided. By adopting the above disc-type motor rotor 10, the disc-type motor in this embodiment has a simple structure and is convenient to assemble.

[0078] In this embodiment, the back plate 11 is preferably made of a high-strength non-magnetic material to prevent the back plate 11 from deforming during the operation of the motor. Optionally, the back plate 11 can be made of materials such as titanium alloy, aluminum alloy, glass fiber, carbon fiber, etc. In some embodiments, the magnetic conduction blocks 12 can be fixed on the back plate 11 by means of bonding, fastener connection, etc.

[0079] In some embodiments, such as Figure 7 and Figure 8 shown, on the sides of the magnetic conduction blocks 12 and the back plate 11 facing each other, a first dovetail groove 125 and a second dovetail groove 117 are respectively provided. The disc-type motor rotor 10 further includes a plug-in member 18. The two ends of the plug-in member 18 along the axial direction are respectively inserted into the first dovetail groove 125 and the second dovetail groove 117. Through the cooperation of the plug-in member 18 with the first dovetail groove 125 and the second dovetail groove 117 respectively, the magnetic conduction blocks 12 can be axially limited to the back plate 11, which is not only convenient for assembly, but also ensures the installation position accuracy of each magnetic conduction block 12, and further can ensure the installation position accuracy of each permanent magnet assembly 13. It should be noted that the circumferential dimension of the notch end of the first dovetail groove 125 is smaller than the circumferential dimension of the bottom end of the groove. The circumferential dimension of the notch end of the second dovetail groove 117 is smaller than the circumferential dimension of the bottom end of the groove. In addition, a central hole 118 is also provided on the back plate 11, and this central hole 118 is used for installing the output shaft 30.

[0080] Such as Figure 7 shown, the two sides of the magnetic conduction block 12 along the circumferential direction have a first side wall 126 and a second side wall 127. The first side wall 126, the second side wall 127 of the adjacent magnetic conduction block 12 and the back plate 11 enclose a limiting groove 110. The cross-section of the permanent magnet assembly 13 has the same shape and size as the cross-section of the limiting groove 110. At least one of the relatively arranged first side wall 126 and second side wall 127 is an inclined surface. Therefore, along the axial direction and away from the back plate 11, the circumferential dimension of the limiting groove 110 gradually decreases, so that the first side wall 126 and / or the second side wall 127 can axially press the permanent magnet assembly 13 against the back plate 11.

[0081] In this embodiment, the first side wall 126 of the magnetic conduction block 12 is opposite to the second side wall 127 of its adjacent magnetic conduction block 12, and both are inclined surfaces. At this time, the cross-section of the limiting groove 110 is trapezoidal, and the two ends of the permanent magnet assembly 13 along the circumferential direction are respectively pressed by the first side wall 126 and the second side wall 127, ensuring that the permanent magnet assembly 13 is firmly installed and uniformly stressed. In other embodiments, only the first side wall 126 or the second side wall 127 enclosing the limiting groove 110 can be set as an inclined surface. At this time, the cross-section of the limiting groove 110 is a right trapezoid.

[0082] In other embodiments (not shown), the magnetic conduction block 12 has a first side wall 126 and a second side wall 127 on both circumferential sides. The first side wall 126, the second side wall 127 of the adjacent magnetic conduction block 12, and the back plate 11 enclose a limiting groove 110. The cross-section of the permanent magnet assembly 13 has the same shape and size as the cross-section of the limiting groove 110. At least one of the oppositely arranged first side wall 126 and second side wall 127 is in concave-convex fit with the corresponding permanent magnet assembly 13. This method can better limit the permanent magnet assembly 13 axially, but it will correspondingly increase the processing difficulty of the permanent magnet assembly 13 and the magnetic conduction block 12.

[0083] To axially fix the magnetic conduction block 12 and the permanent magnet assembly 13, as Figures 6 - 8 shown, the disc motor rotor 10 further includes a pressing plate 15 and a retaining ring 14. The pressing plate 15 is made of non-magnetic conductive material and is connected to the back plate 11. The inner circumferential surface of the magnetic conduction block 12 and the inner circumferential surface of the permanent magnet assembly 13 are in contact with the pressing plate 15. The retaining ring 14 is also made of non-magnetic conductive material. The retaining ring 14 surrounds the outer periphery of the back plate 11. The outer circumferential surface of the magnetic conduction block 12 and the outer circumferential surface of the permanent magnet assembly 13 are both in contact with the retaining ring 14, so as to limit the outer ends of the magnetic conduction block 12 and the permanent magnet assembly 13 in the radial direction. That is to say, through the pressing plate 15 and the retaining ring 14, the magnetic conduction block 12 and the permanent magnet assembly 13 can be limited in the radial direction.

[0084] Optionally, the pressing plate 15 is bonded to or connected to the back plate 11 by fasteners. The pressing plate 15 is made of materials such as titanium alloy, aluminum alloy, glass fiber, and carbon fiber. In this embodiment, the pressing plate 15 is generally annular, and the hole in the center of the pressing plate 15 is used to avoid the output shaft 30.

[0085] During the high-speed rotation of the disc motor, the inner ends of the magnetic conduction block 12 and the permanent magnet assembly 13 in the radial direction are prone to the problem of warping.

[0086] In this regard, as Figure 7 and Figure 8 shown, the outer circumferential surface of the pressing plate 15 includes a plurality of abutting surfaces 151 and a plurality of first pressing inclined surfaces 152. The abutting surfaces 151 and the first pressing inclined surfaces 152 are arranged alternately. The inner circumferential surface of the permanent magnet assembly 13 abuts against the abutting surfaces 151. The inner circumferential surface of the magnetic conduction block 12 is configured as a second pressing inclined surface 128. The first pressing inclined surface 152 abuts against the second pressing inclined surface 128, so that the pressing plate 15 axially presses the magnetic conduction block 12 against the back plate 11. The first pressing inclined surface 152 on the pressing plate 15 presses against the second pressing inclined surface 128 of the magnetic conduction block 12, which can prevent the inner end of the magnetic conduction block 12 in the radial direction from warping during the high-speed rotation of the motor. Since the first side wall 126 and the second side wall 127 of the magnetic conduction block 12 axially press the permanent magnet assembly 13, the inner ring of the permanent magnet assembly 13 in the radial direction is not prone to the above-mentioned warping problem either.

[0087] In this embodiment, the material, forming method, etc. of the retaining ring 14 are the same as those of the retaining ring 14 in the first embodiment, and will not be elaborated here.

[0088] Embodiment Three

[0089] This embodiment provides a disc motor rotor 10. The main difference between it and the disc motor rotor 10 in the first embodiment lies in the specific connection methods of structures such as the permanent magnet assembly 13, the magnetic conduction block 12, and the back plate 11, which are as follows:

[0090] As Figures 9 - 11 shown, the disc motor rotor 10 further includes a back plate 11 and a plurality of connecting pieces 16. Among them, the back plate 11 is made of non-magnetic material, and a plurality of magnetic conduction blocks 12 and a plurality of permanent magnet assemblies 13 are arranged on the same side of the back plate 11. First grooves 124 and second grooves 131 are respectively arranged on the opposite surfaces of the magnetic conduction block 12 and the permanent magnet assembly 13, and the first grooves 124 and the second grooves 131 enclose a positioning groove 17 extending in the radial direction. Each connecting piece 16 is correspondingly inserted and matched with a positioning groove 17 and is fixedly connected to the back plate 11.

[0091] In the disc motor rotor 10 of this embodiment, a plurality of magnetic conduction blocks 12 and a plurality of permanent magnet assemblies 13 are alternately arranged along the circumferential direction of the back plate 11, and the back plate 11 is made of non-magnetic material, so magnetic circuit short - circuit between adjacent permanent magnet assemblies 13 can be avoided; the first grooves 124 and the second grooves 131 on the opposite surfaces of the magnetic conduction block 12 and the permanent magnet assembly 13 enclose a positioning groove 17, and the connecting piece 16 is fixedly connected to the back plate 11 and is inserted and matched with the positioning groove 17. Therefore, the connecting piece 16 can both axially limit the corresponding magnetic conduction block 12 and circumferentially limit the corresponding permanent magnet assembly 13, thereby simplifying the connection structure of the disc motor rotor 10 and improving the assembly efficiency of the disc motor rotor 10.

[0092] In this embodiment, the back plate 11 is preferably made of high - strength non - magnetic material to prevent the back plate 11 from deforming during the operation of the motor. Optionally, the back plate 11 can be made of materials such as titanium alloy, aluminum alloy, glass fiber, carbon fiber, etc.

[0093] Preferably, the connecting piece 16 is made of magnetic material to avoid the connecting piece 16 affecting the magnetic field line distribution of the permanent magnet assembly 13. Specifically, the connecting piece 16 can be made of materials with good magnetic conductivity such as silicon steel, SMC material, steel, iron, amorphous alloy, etc.

[0094] In this embodiment, the first groove 124 extends along the radial direction of the disc-type motor rotor 10, and the second groove 131 also extends along the radial direction of the disc-type motor rotor 10. Therefore, the positioning groove 17 formed by the first groove 124 and the second groove 131 also extends along the radial direction of the disc-type motor rotor 10. Further, the extending trajectory of the positioning groove 17 is a straight line. Correspondingly, the connecting member 16 is a rod, and both ends of the rod are respectively connected to the back plate 11. Such a setting can reduce the assembly difficulty of the connecting member 16. Optionally, the cross-section of the positioning groove 17 is circular. Correspondingly, the cross-section of the connecting member 16 is circular. Therefore, when installing the connecting member 16, it is not necessary to adjust the orientation, which can further improve the convenience of assembly.

[0095] As Figure 10 shown, the back plate 11 includes a main body plate 114, an inner ring limiting plate 115, and an outer ring limiting plate 116. A plurality of magnetic conduction blocks 12 and a plurality of permanent magnet assemblies 13 are all arranged on one side of the main body plate 114. The inner ring limiting plate 115 stands on one side of the main body plate 114. The inner circumferential surfaces of the respective magnetic conduction blocks 12 and the inner circumferential surfaces of the respective permanent magnet assemblies 13 are all in contact with the inner ring limiting plate 115. The outer ring limiting plate 116 stands on one side of the main body plate 114 and is coaxially arranged outside the inner ring limiting plate 115. The outer circumferential surfaces of the respective magnetic conduction blocks 12 and the outer circumferential surfaces of the plurality of permanent magnet assemblies 13 are all in contact with the outer ring limiting plate 116. The inner ring limiting plate 115 can limit the inner ends in the radial direction of the respective magnetic conduction blocks 12 and the permanent magnet assemblies 13, and the outer ring limiting plate 116 can limit the outer ends in the radial direction of the respective magnetic conduction blocks 12 and the permanent magnet assemblies 13. That is to say, the back plate 11 plays a role of radially limiting the permanent magnet assembly 13 and the magnetic conduction block 12 in this application, without the need to additionally increase components, further simplifying the structure of the disc-type motor rotor 10 and further improving the assembly efficiency of the disc-type motor rotor 10.

[0096] In this embodiment, the main body plate 114 is of an annular structure, and the central hole 118 of the main body plate 114 is used for installing the output shaft 30. The inner ring limiting plate 115 is arranged in the middle region along the radial direction of the back plate 11, and the outer ring limiting plate 116 is arranged at the outer edge of the back plate 11. Optionally, the main body plate 114, the inner ring limiting plate 115, and the outer ring limiting plate 116 can be integrally formed, or can be a split structure and connected together by means of welding, fasteners connection, etc.

[0097] As Figure 10 and Figure 11As shown, a plurality of first threaded holes 1151 are provided along the circumferential direction of the inner ring limiting plate 115. The inner end of the connecting member 16 in the radial direction is provided with an external thread, and the inner end of the connecting member 16 in the radial direction is threadedly connected to the first threaded hole 1151. A plurality of second threaded holes 1161 are provided along the circumferential direction of the outer ring limiting plate 116. The outer end of the connecting member 16 in the radial direction is provided with an external thread, and the outer end of the connecting member 16 in the radial direction is threadedly connected to the second threaded hole 1161. When assembling the disc motor rotor 10, first, a plurality of permanent magnet assemblies 13 and a plurality of magnetic conduction blocks 12 are alternately placed between the inner ring limiting plate 115 and the outer ring limiting plate 116. Then, the connecting member 16 is rotated and inserted into the second threaded hole 1161, the corresponding positioning groove 17, and the corresponding first threaded hole 1151 in sequence along the radial direction until the inner end of the connecting member 16 is threadedly connected to the first threaded hole 1151 on the inner ring limiting plate 115. At this time, the outer end of the connecting member 16 is just threadedly connected to the second threaded hole 1161 on the outer ring limiting plate 116.

[0098] It should be noted that to ensure the smooth installation of the connecting member 16, the aperture of the first threaded hole 1151 is not greater than the aperture of the second threaded hole 1161. The diameter of the part of the connecting member 16 where the external thread is provided at the inner end in the radial direction is not greater than the diameter of the middle part of the connecting member 16, and the diameter of the middle part of the connecting member 16 is not greater than the diameter of the part where the external thread is provided at the outer end of the connecting member 16 in the radial direction.

[0099] In other embodiments (not shown), a plurality of first mounting holes are provided along the circumferential direction of the inner ring limiting plate 115. The inner end of the connecting member 16 in the radial direction is inserted into the first mounting hole and bonded to the inner wall of the first mounting hole; a plurality of second mounting holes are provided along the circumferential direction of the outer ring limiting plate 116. The outer end of the connecting member 16 in the radial direction is inserted into the second mounting hole and bonded to the inner wall of the second mounting hole.

[0100] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, rather than limitations on the implementation manners of the present invention. For those of ordinary skill in the art, according to the idea of the present invention, there will be changes in the specific implementation manners and application scopes. The content of this specification should not be construed as a limitation on the present invention. Any modifications, equivalent replacements, and improvements made within the spirit and principle of the present invention shall be included within the protection scope of the claims of the present invention.

Claims

1. A disc-type motor rotor, characterized in that: include: A plurality of permanent magnet assemblies (13) and a plurality of magnetic conductive blocks (12), wherein the permanent magnet assemblies (13) and the magnetic conductive blocks (12) are alternately arranged in the circumferential direction, the permanent magnet assemblies (13) are tangentially magnetized, and the magnetic poles of adjacent permanent magnet assemblies (13) are opposite; The central angle of the circle subtended by the midpoint of the permanent magnet assembly (13) in the radial direction is α. in: P is the number of magnetic poles of the disc motor, A is a constant, 15%≤A≤20%.

2. The disc motor rotor according to claim 1, characterized in that: The dimension of the permanent magnet assembly (13) in a first direction is D, the first direction is parallel to the axial direction, the maximum dimension of the permanent magnet assembly (13) in a second direction is B, the second direction is perpendicular to the axial direction and the radial direction respectively, and the ratio of the dimension D to the dimension B is 0.8-1.

2.

3. The disc motor rotor according to claim 1, characterized in that: The permanent magnet assembly (13) comprises a permanent magnet; or The permanent magnet assembly (13) comprises a plurality of permanent magnets and a plurality of magnetic conductive parts, wherein the permanent magnets and the magnetic conductive parts are alternately arranged along the circumferential direction.

4. The disc motor rotor according to any one of claims 1 to 3, characterized in that: include: A back plate (11) is made of a non-magnetic material, and the back plate (11) is provided with a plurality of slots (113) spaced apart along its circumference; A plurality of magnetic conductive blocks (12), each of the magnetic conductive blocks (12) being inserted into the slot (113) in the radial direction and being mutually limited in the axial direction with the back plate (11), and a limiting groove (110) being formed between adjacent magnetic conductive blocks (12); A plurality of permanent magnet components (13), each of the permanent magnet components (13) being inserted into the limiting groove (110) in the radial direction, so that the groove wall of the limiting groove (110) presses the corresponding permanent magnet component (13) against the back plate (11) in the axial direction.

5. The disc motor rotor according to claim 4, characterized in that: The back plate (11) comprises a plate body (111) and an annular stop rib (112); a plurality of the slots (113) are arranged on the plate body (111); the annular stop rib (112) is vertically arranged on one side of the plate body (111); the inner circumferential surface of the permanent magnet assembly (13) and the inner circumferential surface of the magnetic conductive block (12) are both against the annular stop rib (112); The disc motor rotor also includes a retaining ring (14), which is made of a non-magnetic material. The retaining ring (14) surrounds the outer circumference of the back plate (11), and the outer circumferential surface of the magnetic conductive block (12) and the outer circumferential surface of the permanent magnet assembly (13) both abut against the retaining ring (14).

6. The disc motor rotor according to any one of claims 1 to 3, characterized in that: include: A back plate (11) made of a non-magnetic material; A plurality of magnetic conductive blocks (12) are installed on the same side of the back plate (11), the plurality of magnetic conductive blocks (12) are arranged at intervals along the circumferential direction, and limiting grooves (110) are formed between adjacent magnetic conductive blocks (12); A plurality of permanent magnet components (13), each of the permanent magnet components (13) being inserted into a limiting groove (110) in the radial direction, and the groove wall of the limiting groove (110) pressing the corresponding permanent magnet component (13) against the back plate (11) in the axial direction.

7. The disc motor rotor according to claim 6, characterized in that: Also includes: A pressure plate (15) is made of a non-magnetic material, the pressure plate (15) is connected to the back plate (11), and the inner ring surface of the magnetic conductive block (12) and the inner ring surface of the permanent magnet assembly (13) are evenly abutted against the pressure plate (15); and / or The retaining ring (14) is made of a non-magnetic material. The retaining ring (14) surrounds the outer circumference of the back plate (11). The outer circumferential surface of the magnetic conductive block (12) and the outer circumferential surface of the permanent magnet assembly (13) are both against the retaining ring (14).

8. The disc motor rotor according to claim 1, characterized in that: include: A back plate (11) made of a non-magnetic material; A plurality of magnetic conductive blocks (12) and a plurality of permanent magnet assemblies (13) are arranged on the same side of a back plate (11) and are alternately arranged along the circumference of the back plate (11); a first groove (124) and a second groove (131) are respectively arranged on surfaces of the magnetic conductive blocks (12) and the permanent magnet assemblies (13) facing each other; the first groove (124) and the second groove (131) are arranged to form a positioning groove (17) extending in the radial direction; A plurality of connecting members (16), each of the connecting members (16) is correspondingly inserted into one of the positioning grooves (17) and fixedly connected to the back plate (11).

9. A disc motor, characterized in that: It comprises a stator (20) and a disc-type motor rotor as claimed in any one of claims 1 to 8, wherein the stator (20) and the disc-type motor rotor are arranged in a circumferential direction.

10. The disk motor according to claim 9, characterized in that: The pole slots of the stator (20) are matched to form 9N slots and 2N poles, wherein N is a positive integer.

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