Novel permanent magnet rotor and magnetic suspension motor

Abstract

The utility model belongs to the technical field of magnetic suspension motors, and discloses a novel permanent magnet rotor and a magnetic suspension motor, and the novel permanent magnet rotor comprises a longitudinally arranged connecting shaft, and an upper permanent magnet rotor and a lower permanent magnet rotor which are vertically arranged at the two ends of the connecting shaft. The upper permanent magnet rotor is provided with a first annular Halbach array formed by at least two first magnet units in a surrounding mode, the lower permanent magnet rotor is provided with a second annular Halbach array formed by at least two second magnet units in a surrounding mode, and the connecting shaft is of a non-magnetic-conduction structure. The magnetic suspension motor comprises a stator and the novel permanent magnet rotor arranged at the central position of the stator. According to the novel permanent magnet rotor, the annular Halbach arrays are arranged on the upper permanent magnet rotor and the lower permanent magnet rotor, the magnetic field structure is optimized, the magnetic field utilization rate of the permanent magnet material is improved, the output torque of the motor can be increased, the cogging torque can be reduced, the torque fluctuation is reduced, and the operation stability and the operation efficiency of the motor can be improved.

Description

Technical Field

[0001] This utility model relates to the field of magnetic levitation motor technology, and in particular to a novel permanent magnet rotor and magnetic levitation motor. Background Technology

[0002] Magnetic levitation motors achieve rotor levitation in the air gap through the magnetic force between the stator and rotor, thus having the characteristics of no friction, no wear, and no need for lubrication, and are developed for high-speed and high-power applications.

[0003] Magnetic levitation motors are divided into bearing-type and bearingless types. Bearing-type magnetic levitation motors rely on a single electromagnetic bearing for levitation. Bearingless magnetic levitation motors, on the other hand, utilize stator windings and a permanent magnet rotor to achieve active levitation control, eliminating the need for additional magnetic bearings. Therefore, they have shorter rotor dimensions, higher critical speeds, and greater output power. Furthermore, because there is no mechanical contact between the rotor and stator, they experience less noise and wear during operation, less pollution, lower energy consumption, and higher operating efficiency and precision. Consequently, they are widely used in various fields, such as semiconductors, healthcare, smart homes, and industrial automation.

[0004] However, existing magnetic levitation bearingless motors suffer from problems such as difficulty in improving the torque and axial stiffness of the permanent magnet rotor, insufficient rotor stability at high speeds, and low magnetic field utilization.

[0005] Therefore, existing technologies need further improvement. Utility Model Content

[0006] To address the aforementioned problems, this utility model provides a novel permanent magnet rotor and magnetic levitation motor. The novel permanent magnet rotor achieves directional enhancement of the magnetic field on the outer circumferential surface near the stator end by setting an annular Hellbeck array on the upper and lower permanent magnet rotors, resulting in high magnetic field utilization and high operational stability of the rotor.

[0007] In a first aspect, this application provides a novel permanent magnet rotor, which includes an upper permanent magnet rotor, a lower permanent magnet rotor, and a connecting shaft connected between them, arranged coaxially. The upper permanent magnet rotor is provided with a first annular Heilbeck array surrounded by a plurality of first magnet units, and the lower permanent magnet rotor is provided with a second annular Heilbeck array surrounded by a plurality of second magnet units. The first magnet units and the second magnet units are each composed of three or more magnetic blocks arranged in different magnetization directions. The connecting shaft is a non-magnetic structure.

[0008] Optionally, in the novel permanent magnet rotor, the upper permanent magnet rotor and the lower permanent magnet rotor are coaxial and overlapping annular structures, and the magnetization directions of the magnets that coincide in the axial projection positions of the upper permanent magnet rotor and the lower permanent magnet rotor are the same or opposite.

[0009] Optionally, in the novel permanent magnet rotor, the first magnet unit is composed of magnetic block one, magnetic block two, magnetic block three and magnetic block four arranged in sequence. Magnetic block one is magnetized radially inward, magnetic block three is magnetized radially outward, magnetic block two is magnetized perpendicular to the magnetization direction of magnetic block one and points towards magnetic block three, and magnetic block four is magnetized perpendicular to the magnetization direction of the third magnetic block and points towards magnetic block three.

[0010] The second magnet unit is composed of magnetic blocks five, six, seven and eight arranged in sequence. Magnetic block five is magnetized radially inward, magnetic block seven is magnetized radially outward, magnetic block six is ​​magnetized perpendicular to the magnetization direction of magnetic block five and points towards magnetic block seven, and magnetic block eight is magnetized perpendicular to the magnetization direction of magnetic block seven and points towards magnetic block seven.

[0011] Radial magnetization refers to magnetization that occurs along the rotor's radial direction, either towards or away from the shaft center.

[0012] Based on the above, in the novel permanent magnet rotor, the adjacent magnetic blocks in the four magnetic blocks of the first magnet unit have complementary structures, and all magnetic blocks are spliced ​​together to form a first annular Halebeck array; the adjacent magnetic blocks in the four magnetic blocks of the second magnet unit have complementary structures, and all magnetic blocks are spliced ​​together to form a second annular Halebeck array.

[0013] Optionally, in the novel permanent magnet rotor, in the first magnet unit, the structures of magnet 1, magnet 2, magnet 3 and magnet 4 are different from each other, or two of magnet 1, magnet 2, magnet 3 and magnet 4 have the same structure; in the second magnet unit, the structures of magnet 5, magnet 6, magnet 7 and magnet 8 are different from each other, or two of magnet 1, magnet 2, magnet 3 and magnet 4 have the same structure.

[0014] In the first optional embodiment, in the novel permanent magnet rotor, each magnetic block of the first magnet unit and the second magnet unit is a quasi-triangular prism, and the inner or outer side of the quasi-triangular prism facing the rotor axis is an arc surface.

[0015] In an optional second embodiment, in the novel permanent magnet rotor, each magnetic block of the first magnet unit and the second magnet unit is a fan-shaped ring column.

[0016] In the optional third embodiment, the magnetic blocks one and three of the first magnet unit have the same structure, which is an inverted parabola or a petal-like shape with the opening facing inward. The adjacent magnetic blocks one and three are connected on both sides and arranged in a ring to form a flower-shaped inner ring of the ring array. Magnetic blocks two and four fill the gaps between adjacent magnetic blocks one and three, and together form a ring-shaped Heilbeck array. The structure of the second magnet unit is the same as that of the first magnet unit.

[0017] Optionally, in the novel permanent magnet rotor, the first magnet and the second magnet on the upper permanent magnet rotor and the lower permanent magnet rotor are arranged in overlapping or staggered positions.

[0018] Secondly, this application also provides a magnetic levitation motor, which includes: a stator and a novel permanent magnet rotor disposed at the center of the stator.

[0019] Optionally, in the magnetic levitation motor, the stator includes a plurality of longitudinally arranged C-shaped first magnetic yokes that are annularly distributed around the outer periphery of the rotor. A coil for driving the rotor to levitate and rotate is wound around the middle of the first magnetic yoke. An annular second magnetic yoke is horizontally arranged at the middle position of the stator. The first magnetic yoke and the second magnetic yoke are perpendicularly connected.

[0020] This utility model has the following beneficial effects:

[0021] 1. The novel permanent magnet rotor provided by this utility model has an ingenious structural design. By setting an annular Halebeck array on the upper and lower permanent magnet rotors, the magnetic field on the outer peripheral surface of the rotor near the stator end is directionally strengthened, the magnetic field of the rotor is optimized, and the magnetic field utilization rate of the permanent magnet material is improved. This not only increases the output torque of the motor, but also reduces the cogging torque, thereby reducing torque fluctuation and helping to improve the smoothness and efficiency of the motor operation.

[0022] 2. In the permanent magnet rotor, the annular Heilbeck array permanent magnet array, due to its unique magnetic field distribution, can eliminate the need for the magnetic back plate in motors that traditionally use multi-pole magnet rotors, and does not rely on the magnetic conductivity of the connecting shaft. Therefore, while ensuring the stability of the rotor structure, the thickness and specifications of the connecting shaft can be reduced to the greatest extent, thereby achieving rotor weight reduction, reducing rotor inertia, and improving the motor's rapid response capability. Attached Figure Description

[0023] Figure 1 This is a three-dimensional structural schematic diagram of the novel permanent magnet rotor of Example 1;

[0024] Figure 2 This is a top view of the novel permanent magnet rotor of Example 1; the arrows in the figure indicate the magnetization direction.

[0025] Figure 3 This is a schematic diagram of the overall structure of the magnetic levitation motor in Example 1;

[0026] Figure 4 This is a longitudinal cross-sectional view of the magnetic levitation motor in Example 1; the lines with arrows represent magnetic field lines.

[0027] Figure 5 This is a schematic diagram of the magnetic field lines distribution at a top view angle for the upper rotor layer and the lower rotor layer of the magnetic levitation motor in Example 1.

[0028] Figure 6 This is a top view of the novel permanent magnet rotor of Example 2; the arrows in the figure indicate the magnetization direction.

[0029] Figure 7 This is a perspective view of a motor using the novel permanent magnet rotor of Example 2; the connecting shaft portion is omitted in the figure.

[0030] Figure 8 This is a schematic cross-sectional view of the rotor in Example 1;

[0031] Figure 9 This is a schematic diagram of another cross-sectional structure of the rotor in Example 1;

[0032] Figure 10 This is a top view schematic diagram of the novel permanent magnet rotor in Example 3;

[0033] Figure 11 This is a three-dimensional structural diagram of the motor in Example 3. Detailed Implementation

[0034] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present utility model. It should be noted that when an element is described as being "fixed to" another element, it can be directly on the other element, or one or more intermediate elements may exist therebetween. When an element is described as being "connected" to another element, it can be directly connected to the other element, or one or more intermediate elements may exist therebetween. The terms "vertical," "horizontal," "left," "right," "upper," "lower," "inner," "outer," "bottom," etc., used in this specification indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present utility model. In addition, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0035] Unless otherwise defined, all technical and scientific terms used in this specification have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to limit the invention. The term "and / or" as used in this specification includes any and all combinations of one or more of the associated listed items. Furthermore, technical features involved in the different embodiments of this invention described below may be combined with each other as long as they do not conflict with each other.

[0036] Example 1

[0037] like Figures 1-2 As shown, this embodiment provides a novel permanent magnet rotor, which includes an upper permanent magnet rotor 11 and a lower permanent magnet rotor 13 arranged coaxially, and a connecting shaft 12 connecting the two. The upper permanent magnet rotor is provided with a first annular Hellbeck array surrounded by a plurality of first magnet units 11a, and the lower permanent magnet rotor is provided with a second annular Hellbeck array surrounded by a plurality of second magnet units 13a. The connecting shaft is a non-magnetic cylindrical structure.

[0038] The arrangement of the aforementioned annular Heilbeck array of rotors concentrates the magnetic lines of force on the outer peripheral surface of the upper permanent magnet rotor / lower permanent magnet rotor near the stator. That is, the magnetic field of the upper permanent magnet rotor 11 and the lower permanent magnet rotor 13 near the outer peripheral surface of the stator is strengthened, thereby greatly improving the magnetic field utilization rate, thereby increasing the output torque of the motor, reducing cogging torque, thereby reducing torque fluctuation, and achieving the effect of improving the smoothness and efficiency of motor operation.

[0039] In the permanent magnet rotor, the annular Heilbeck array permanent magnet array, due to its unique magnetic field distribution, can eliminate the need for the magnetic back plate in motors that traditionally use multi-pole permanent magnet rotors, and does not rely on the magnetic conductivity of the connecting shaft. Therefore, while ensuring the stability of the rotor structure, the thickness and specifications of the connecting shaft can be reduced to the greatest extent, thereby achieving rotor lightweighting, reducing rotor inertia, and improving the motor's rapid response capability.

[0040] The upper permanent magnet rotor and the lower permanent magnet rotor are coaxial and overlapping circular ring structures.

[0041] The first magnet unit 11a and the second magnet unit 13a are each composed of three or more magnet blocks arranged in different magnetization directions.

[0042] In this embodiment, the first magnet unit 11a is composed of four magnetic blocks arranged sequentially: magnetic block one, magnetic block two, magnetic block three, and magnetic block four. Magnetic block one is magnetized radially inwards, magnetic block three is magnetized radially outwards, magnetic block two is magnetized perpendicular to the magnetization direction of magnetic block one and points towards magnetic block three, and magnetic block four is magnetized perpendicular to the magnetization direction of the third magnetic block and points towards magnetic block three. Adjacent magnetic blocks in the four magnetic blocks of the first magnet unit have complementary structures, and all magnetic blocks are assembled to form a first annular Halebeck array. Radial magnetization refers to magnetization along the rotor radius towards or away from the axis.

[0043] The second magnet unit 13a is composed of magnet blocks five, six, seven, and eight arranged sequentially. Magnet block five is magnetized radially inwards, magnet block seven is magnetized radially outwards, magnet block six is ​​magnetized perpendicular to the magnetization direction of magnet block five and points towards magnet block seven, and magnet block eight is magnetized perpendicular to the magnetization direction of magnet block seven and points towards magnet block seven. Adjacent magnet blocks in the four magnet blocks of the second magnet unit have complementary structures, and all magnet blocks are joined together to form a second ring-shaped Hellbeck array.

[0044] In other embodiments, the number of magnetic blocks constituting the first magnet unit is not limited to the four in this embodiment, but can also be set to three, five or more.

[0045] In this embodiment, magnetic block one and magnetic block three have the same structure, and magnetic block two and magnetic block four have the same structure; correspondingly, magnetic block five and magnetic block seven have the same structure, and magnetic block six and magnetic block eight have the same structure.

[0046] In other embodiments, the structures of magnetic block 1, magnetic block 2, magnetic block 3 and magnetic block 4 are all different, and in the second magnet unit, the structures of magnetic block 5, magnetic block 6, magnetic block 7 and magnetic block 8 are all different.

[0047] In this embodiment, the upper permanent magnet rotor and the lower permanent magnet rotor are coaxial and overlapping circular ring structures. Each magnetic block of the first magnet unit and the second magnet unit is a triangular prism-like surface, and the inner or outer side of the triangular prism-like surface facing the rotor axis is an arc surface.

[0048] In other embodiments, the shapes of adjacent magnetic blocks may also vary. These variations are all within the scope of protection of this application.

[0049] like Figure 8As shown, to achieve a stable connection between the connecting shaft and the upper and lower permanent magnet rotors, the following configuration is implemented: the connecting shaft is a hollow tubular structure with a through hole 121 in the middle. First insertion portions 142 are respectively provided at the upper and lower ends of the connecting shaft. Second insertion portions, which engage with the first insertion portions, are provided at the center of both the upper and lower permanent magnet rotors. Furthermore, to strengthen the connection, the first and second insertion portions are also bonded together or otherwise fixedly connected.

[0050] Optionally, the first connector is a plug, and the second connector is a socket that snaps into the plug. This plug-in connection method allows for pre-installation via plugging, followed by strengthening the connection between the upper and lower permanent magnet rotors and the connecting shaft through other methods. This results in higher installation precision and avoids the potential eccentricity error between the upper and lower permanent magnet rotors and the connecting shaft that may occur during the installation of the rotor in Embodiment 1.

[0051] like Figure 9 As shown, in other embodiments of the permanent magnet rotor, the upper end of the connecting shaft is fixedly connected to the lower end face of the upper permanent magnet rotor, and the lower end of the connecting shaft is fixedly connected to the upper end face of the lower permanent magnet rotor; the connecting shaft is a hollow tubular structure with a through hole 121 in the middle; the main bodies of the upper and lower permanent magnet rotors are circular, and a central hole 141 aligned with the through hole of the connecting shaft is provided along the center of the upper and lower permanent magnet rotors.

[0052] The upper permanent magnet rotor, lower permanent magnet rotor, and connecting shaft are fixedly connected by one or more methods, such as bonding or ultrasonic welding. Optionally, in the novel permanent magnet rotor, adjacent magnetic blocks are directly bonded together for fixed connection.

[0053] like Figures 3-5 As shown, this embodiment also provides a magnetic levitation motor, which includes: a stator and a novel permanent magnet rotor disposed at the center of the stator. The novel permanent magnet rotor adopts the structure of Embodiment 1.

[0054] The stator includes multiple longitudinally arranged first magnetic yokes 21 arranged in a ring around the outer periphery of the rotor. A coil group 22 for driving the rotor to levitate and rotate is wound around the middle of the first magnetic yoke. A ring-shaped second magnetic yoke 23 is horizontally arranged at the middle of the stator. The first magnetic yokes and the second magnetic yokes are perpendicularly connected. The first magnetic yoke 21 includes: a longitudinally arranged axial arm and radial arms located at both ends of the axial arm that extend horizontally in the direction of the upward permanent magnet rotor or the downward permanent magnet rotor, respectively.

[0055] In this embodiment, each coil group includes a levitation coil for providing a levitation magnetic field to the rotor and a rotating coil for providing a rotating magnetic field to the rotor. A set of coil groups 22 is wound on the axial arm of each first yoke, positioned above and below the second yoke. The levitation and rotation of the rotor can be independently controlled by controlling either the levitation coil or the rotating coil, providing greater control flexibility.

[0056] In this embodiment, the first magnet and the second magnet on the upper permanent magnet rotor 11 and the lower permanent magnet rotor 13 are arranged in an overlapping manner and have the same magnetization direction. The first magnet unit / second magnet unit of the upper permanent magnet rotor / lower permanent magnet rotor in a Helbeck array, the corresponding first yoke, and the second yoke portion connecting the two first yokes form a connected closed-loop magnetic circuit.

[0057] Because the stator in this embodiment is symmetrically distributed vertically with the second magnetic yoke as the center of symmetry, during operation, there are vertically symmetrical closed-loop main magnetic circuits in the stator. These two main magnetic circuits are controlled by two sets of drive coil groups 22 distributed vertically, respectively, thereby realizing separate control of the rotation and levitation torque of the upper and lower parts of the rotor, improving the controllability and stability of the rotor. The magnetic circuit directions of the two main magnetic circuits are consistent on the shared annular second magnetic yoke.

[0058] Rotation principle: such as Figure 5 As shown, at a certain moment, the rotating coils on the two first magnetic yokes 21 that are not radially symmetrical with the rotor magnetic blocks are simultaneously energized, exciting magnetic lines of force that flow upward (or downward) axially at the same time. The main magnetic lines of force pass through a first magnetic yoke, multiple magnetic blocks of the first magnetic unit of the upper permanent magnet rotor / the second magnetic unit of the lower permanent magnet rotor (forming an outward-opening U-shaped magnetic circuit), the first magnetic yoke corresponding to the other end of the U-shaped magnetic circuit, and the second magnetic yoke connecting part located between the two first magnetic yokes to form a closed-loop magnetic circuit, forming two shorter closed main magnetic circuits distributed left and right on the upper part of the stator.

[0059] During levitation, opposite currents are applied to each pair of rotating coils, causing the magnetic circuit to close through the transverse arm of the second yoke, resulting in symmetrical alignment of the upper and lower double-layered magnetic paths. This control method can also utilize a structure with staggered upper and lower rotor teeth, where the flow direction of the upper and lower magnetic circuits within the transverse yoke is the same, thus achieving coordinated operation of the upper and lower magnetic circuits. By coordinating the control of the rotating coils in the upper and lower halves of the stator, the rotor's rotational torque can be increased, improving its stability and accuracy.

[0060] Suspension principle: such as Figure 4As shown, the rotor levitation in this embodiment is mainly achieved by generating magnetic force between the first magnetic yoke and the rotor. When each levitation coil on the first magnetic yoke on the stator is energized and the current is adjusted to make the axial tension on the rotor equal, the rotor can achieve radially centered levitation. When the bottom of the rotor deviates radially, the levitation coil on the side with increased air gap at the bottom of the stator will increase the current, thereby increasing the attractive force on that side to correct the radial deviation of the rotor bottom.

[0061] In other embodiments, the first and second magnets on the upper permanent magnet rotor 11 and the lower permanent magnet rotor 13, located on the same main magnetic circuit, are vertically offset but have the same magnetization direction. For example, the corresponding first and second magnets on the upper permanent magnet rotor 11 and the lower permanent magnet rotor 13 are vertically offset by 45°. This vertically offset rotor arrangement allows for a smoother transition during rotor rotation and reduces torque fluctuations. The main magnetic circuit distribution in this scheme is essentially the same as that of a main magnetic circuit where the rotors overlap vertically and have the same magnetization direction.

[0062] In other embodiments, the magnets of the upper and lower permanent magnet rotors, whose axial projection positions coincide, are magnetized in opposite directions. This rotor can be assembled with a stator equipped with or without a ring-shaped second yoke.

[0063] In this case, the main magnetic circuit distribution in the motor differs from that in this embodiment. Specifically, when the rotating coils of the two radially symmetrical C-shaped first magnetic yokes are simultaneously energized, two sets of longitudinally distributed main magnetic lines of force are simultaneously excited. Each set of main magnetic lines of force passes through the upper radial arm of the first magnetic yoke A, multiple first magnets of the upper rotor (forming a U-shaped magnetic circuit), and then flows into the upper radial arm of the adjacent first magnetic yoke B. It then flows axially downward to its lower radial arm, multiple second magnets of its corresponding lower rotor (forming a U-shaped magnetic circuit), and finally flows back to the initial first magnetic yoke A, completing the closed loop of the main magnetic circuit and forming two larger closed magnetic circuits distributed to the left and right. Its levitation and rotation working principle is basically similar to that in this embodiment, and will not be described again.

[0064] The motor, through the cooperation of the stator with the permanent magnet rotor and the ring-shaped second magnetic yoke, optimizes the main magnetic circuit. On the one hand, the main magnetic circuit is shorter, and on the other hand, a closed-loop main magnetic circuit with symmetrical upper and lower distribution exists in the motor. By controlling these two main magnetic circuits through two sets of drive coil groups, independent control of the upper and lower parts of the rotor can be achieved. This facilitates precise control of the rotor's axial position offset, radial offset, and tilt angle, and transforms the rotor tilt angle and suspension control from passive control to active control, thereby significantly improving the stability of rotor operation.

[0065] The stator of the motor also includes a controller and a sensor connected to the controller. The sensor is used to detect the radial and axial position and attitude of the rotor, and the controller is used to regulate the current direction and magnitude of the first drive coil group and the second drive coil group.

[0066] For other internal structures of the motor, please refer to the prior art.

[0067] Example 2

[0068] like Figure 6 As shown, this embodiment provides another novel permanent magnet rotor 1, which includes a longitudinally arranged connecting shaft and an upper permanent magnet rotor 11 and a lower permanent magnet rotor 13 vertically arranged at both ends of the connecting shaft. The upper permanent magnet rotor is provided with a first annular Hellbeck array surrounded by a plurality of first magnet units 11a, and the lower permanent magnet rotor is provided with a second annular Hellbeck array surrounded by a plurality of second magnet units 13a. The connecting shaft is a non-magnetic cylindrical structure.

[0069] The difference from Embodiment 1 is that in this embodiment, each magnetic block of the first magnet unit and the second magnet unit is a fan-shaped ring column.

[0070] like Figure 7 As shown, this embodiment also provides a magnetic levitation motor that uses the above-mentioned permanent magnet rotor, and the specific configuration of its stator is as described in Embodiment 1.

[0071] The levitation and rotation principles of the motor in this embodiment are the same as those in Embodiment 1, and will not be repeated here.

[0072] Example 3

[0073] like Figure 10 As shown, this embodiment provides another novel permanent magnet rotor 1, which includes a longitudinally arranged connecting shaft and an upper permanent magnet rotor 11 and a lower permanent magnet rotor 13 vertically arranged at both ends of the connecting shaft. The upper permanent magnet rotor is provided with a first annular Hellbeck array surrounded by a plurality of first magnet units 11a, and the lower permanent magnet rotor is provided with a second annular Hellbeck array surrounded by a plurality of second magnet units 13a. The connecting shaft is a non-magnetic cylindrical structure.

[0074] The difference from Example 1 is as follows: Figure 10 As shown, in this embodiment, the magnetic blocks 1 and 3 of the first magnet unit have the same structure, which is an inverted parabola or a petal-like shape with the opening facing inward. The adjacent magnetic blocks 1 and 3 are connected on both sides and arranged in a ring to form a flower-shaped inner ring of the ring array. Magnetic blocks 2 and 4 fill the gaps between the adjacent magnetic blocks 1 and 3, and together form a ring-shaped Heilbeck array. The structure of the second magnet unit is the same as that of the first magnet unit.

[0075] The above arrangement concentrates the magnetic field lines on the side of the upper permanent magnet rotor / lower permanent magnet rotor near the outer peripheral surface of the stator, thereby strengthening the magnetic field of the upper permanent magnet rotor 11 and the lower permanent magnet rotor 13 near the outer peripheral surface of the stator.

[0076] like Figure 11 As shown, this embodiment also provides a magnetic levitation motor using the permanent magnet rotor described in this embodiment, and the specific configuration of its stator is as described in Embodiment 1.

[0077] The levitation and rotation principles of the motor in this embodiment are the same as those in Embodiment 1, and will not be repeated here.

[0078] In other embodiments, the shape of the magnetic block is not limited to that shown in the accompanying drawings of this embodiment, and there are various other shape variations. The upper permanent magnet rotor and the lower permanent magnet rotor can be composed of two or more different shaped magnetic blocks arranged in a Halebeck array.

[0079] The device embodiments described above are merely illustrative. The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the modules can be selected to achieve the purpose of this embodiment according to actual needs.

[0080] It is understood that those skilled in the art can make equivalent substitutions or changes based on the technical solution and concept of this utility model, and all such substitutions or changes should fall within the protection scope of the appended claims.

Claims

1. A novel permanent magnet rotor, characterized in that, The device includes an upper permanent magnet rotor (11) and a lower permanent magnet rotor (13) arranged coaxially, and a connecting shaft (12) connecting the two. The upper permanent magnet rotor is provided with a first annular Heilbeck array in which at least two first magnet units (11a) are arranged in a ring, and the lower permanent magnet rotor is provided with a second annular Heilbeck array in which at least two second magnet units (13a) are arranged in a ring. The first magnet unit (11a) and the second magnet unit (13a) are each composed of three or more magnetic blocks arranged in different magnetization directions. The connecting shaft is a non-magnetic structure.

2. The novel permanent magnet rotor according to claim 1, characterized in that, The upper permanent magnet rotor and the lower permanent magnet rotor are coaxial and overlapping circular ring structures. The magnetization directions of the magnets that coincide in the axial projection position of the upper permanent magnet rotor and the lower permanent magnet rotor are the same or opposite.

3. The novel permanent magnet rotor according to claim 1, characterized in that, The first magnet unit (11a) is composed of magnet block one, magnet block two, magnet block three and magnet block four arranged in sequence. Magnet block one is magnetized radially inward, magnet block three is magnetized radially outward, magnet block two is magnetized perpendicular to the magnetization direction of magnet block one and points towards magnet block three, and magnet block four is magnetized perpendicular to the magnetization direction of the third magnet block and points towards magnet block three. The second magnet unit (13a) is composed of magnetic blocks five, six, seven and eight arranged in sequence. Magnetic block five is magnetized radially inward, magnetic block seven is magnetized radially outward, magnetic block six is ​​magnetized perpendicular to the magnetization direction of magnetic block five and points towards magnetic block seven, and magnetic block eight is magnetized perpendicular to the magnetization direction of magnetic block seven and points towards magnetic block seven.

4. The novel permanent magnet rotor according to claim 3, characterized in that, In the first magnet unit, the adjacent magnetic blocks of the four magnetic blocks have complementary structures, and all magnetic blocks are spliced ​​together to form a first ring-shaped Hellbeck array; in the second magnet unit, the adjacent magnetic blocks of the four magnetic blocks have complementary structures, and all magnetic blocks are spliced ​​together to form a second ring-shaped Hellbeck array.

5. The novel permanent magnet rotor according to claim 4, characterized in that, In the first magnet unit, the structures of magnet 1, magnet 2, magnet 3, and magnet 4 are all different, or two of the structures of magnet 1, magnet 2, magnet 3, and magnet 4 are the same; in the second magnet unit, the structures of magnet 5, magnet 6, magnet 7, and magnet 8 are all different, or two of the structures of magnet 5, magnet 6, magnet 7, and magnet 8 are the same.

6. The novel permanent magnet rotor according to claim 4, characterized in that, Each magnetic block of the first magnet unit and the second magnet unit is a triangular prism-like structure, and the inner or outer surface of the triangular prism-like structure facing the rotor shaft is an arc surface.

7. The novel permanent magnet rotor according to claim 4, characterized in that, Each magnetic block in the first magnet unit and the second magnet unit is a fan-shaped ring column.

8. The novel permanent magnet rotor according to claim 4, characterized in that, The magnetic blocks 1 and 3 of the first magnet unit have the same structure, which is an inverted parabola or a petal-like shape with the opening facing inward. The adjacent magnetic blocks 1 and 3 are connected on both sides and arranged in a ring to form a flower-shaped inner ring of the ring array. Magnetic blocks 2 and 4 fill the gaps between adjacent magnetic blocks 1 and 3, and together they form a ring-shaped Heilbeck array. The structure of the second magnet unit is the same as that of the first magnet unit.

9. The novel permanent magnet rotor according to claim 2, characterized in that, The first magnet unit and the second magnet unit on the upper permanent magnet rotor (11) and the lower permanent magnet rotor (13) are arranged in overlapping or misaligned positions.

10. A magnetic levitation motor, characterized in that, include: The stator and the novel permanent magnet rotor as described in claim 1, which is located at the center of the stator.

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