Composite rotor and magnetic suspension motor
By setting radial extensions and connecting magnets on the rotor of the magnetic levitation motor, the magnetic circuit is optimized, which solves the problem of insufficient rotor torque and axial stiffness, and achieves a significant improvement in torque and axial stiffness, thereby enhancing the motor's working performance and stability.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- PANTHER TECHNOLOGY (SHENZHEN) CO LTD
- Filing Date
- 2024-12-30
- Publication Date
- 2026-05-15
AI Technical Summary
Existing magnetic levitation reluctance motors suffer from low rotor torque and insufficient axial stiffness, which affects their operating efficiency and application range.
A composite rotor is designed by setting radial extensions and connecting magnets on the upper and lower rotors to form a structure with magnetic conductive material and radial magnetization, thereby optimizing the magnetic circuit and improving the rotor's torque and axial stiffness.
It significantly improves the torque and axial stiffness of the magnetic levitation motor, optimizes the magnetic field distribution, enhances the motor's working performance and stability, is applicable to various motor control methods, and improves the motor's working efficiency and reliability.
Smart Images
Figure CN224249457U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of reluctance motor technology, and in particular to a composite rotor and magnetic levitation motor. Background Technology
[0002] Magnetic levitation bearingless motors, due to the absence of mechanical contact between their rotor and stator, reduce noise and wear during operation, resulting in less pollution, lower energy consumption, and higher operating efficiency and precision. They are now widely used in various fields, such as semiconductors, healthcare, smart homes, and industrial automation.
[0003] However, although existing magnetic levitation reluctance motors have advantages such as no demagnetization, high reliability, and ultra-long service life, they generally suffer from low rotor torque, insufficient axial stiffness, and low motor operating efficiency, which greatly limits their application and affects customer satisfaction. Therefore, existing technologies need further improvement. Utility Model Content
[0004] To address the aforementioned problems, this invention provides a composite rotor and a magnetic levitation motor. This composite rotor has a simple structure, high reliability, and high rotor torque and axial stiffness, greatly improving the performance of the magnetic levitation motor it is used in.
[0005] To address the above problems, this application provides the following technical solution:
[0006] In a first aspect, this application provides a composite rotor, which includes a longitudinally arranged connecting shaft and an upper rotor and a lower rotor vertically arranged at both ends of the connecting shaft. The outer sides of the upper rotor and the lower rotor are respectively provided with a plurality of radially evenly distributed radial extensions. The main body of the upper rotor and the lower rotor is made of magnetic material, and a radially magnetized connecting magnet is embedded between adjacent radial extensions. The connecting shaft is made of non-magnetic material.
[0007] Optionally, the radial extension is a fan-shaped tooth structure, and the connecting magnet is a fan-ring structure. The connecting magnet of the fan-ring structure and the grooves of the adjacent radial extensions of the rotor are complementary in shape, forming a disk-shaped upper or lower rotor. The radial magnetization of the connecting magnet refers to the magnet pointing towards or away from the axis along the rotor's radial direction.
[0008] In one optional embodiment, in the composite rotor, the radial extension is made of magnetic material, the upper radial extension of the upper rotor and the lower radial extension of the lower rotor are arranged symmetrically and overlappingly, and the magnetization directions of the connecting magnets at corresponding positions on the upper and lower rotors are opposite.
[0009] Optionally, the radial extension and the upper / lower rotor are designed as a single unit, or the radial extension and the upper / lower rotor are fixedly connected.
[0010] In one optional embodiment, in the composite rotor, the radial extension is made of magnetic material, the upper radial extension of the upper rotor and the lower radial extension of the lower rotor are arranged symmetrically and their projections overlap, and the magnetization directions of the connecting magnets at corresponding positions on the upper and lower rotors are the same.
[0011] Specifically, the aforementioned mover is applicable to stators equipped with a horizontal intermediate annular magnetic yoke.
[0012] In one optional embodiment, in the composite rotor, the radial extension is made of magnetic material, the upper radial extension of the upper rotor and the lower radial extension of the lower rotor are staggered, and the magnetization direction of the connecting magnets at the corresponding positions on the upper and lower rotors is consistent.
[0013] Optionally, the upper radial extension of the upper rotor and the lower radial extension of the lower rotor are offset by 45°, and the specifications of the radial extensions and the connecting magnets are consistent.
[0014] Optionally, each rotor has four radial extensions and four connecting magnets of the same specifications. The specifications of the radial extensions and connecting magnets are consistent.
[0015] In one optional embodiment of the composite rotor, the radial extension is a radially magnetized magnet, and the magnetization direction of the radial extension and the adjacent connecting magnet is opposite; the upper radial extension of the upper rotor and the lower radial extension of the lower rotor are arranged symmetrically and overlappingly in projection, and the magnetization direction of the connecting magnets at corresponding positions on the upper rotor and the lower rotor is opposite.
[0016] Specifically, the aforementioned mover is applicable to stators without a horizontal intermediate annular magnetic yoke, or to intermediate annular connecting plates with non-magnetic materials.
[0017] Optionally, in the composite rotor, the radial extension and the connecting magnet are permanent magnets with the same shape.
[0018] In one optional embodiment, in the composite rotor, the radial extension is a radially magnetized magnet, the magnetization direction of the radial extension and the adjacent connecting magnet are opposite, the upper radial extension of the upper rotor and the lower radial extension of the lower rotor are arranged symmetrically and their projections overlap, and the magnetization direction of the connecting magnets at the corresponding positions on the upper rotor and the lower rotor is the same.
[0019] Specifically, the aforementioned mover is applicable to stators with a horizontally positioned annular magnetic yoke. The magnetic circuit consists of two separate, radially symmetrical layers.
[0020] Optionally, in the composite rotor, the connecting shaft is cylindrical and made of non-magnetic materials such as stainless steel, aluminum, or copper.
[0021] Optionally, in the composite rotor, the upper end of the connecting shaft is fixedly connected to the lower end face of the upper rotor, and the lower end of the connecting shaft is fixedly connected to the upper end face of the lower rotor; the connecting shaft is a hollow tubular structure with a through hole in the middle; the main bodies of the upper rotor and the lower rotor are circular, and a central hole aligned with the through hole of the connecting shaft is provided along the center of the upper rotor and the lower rotor.
[0022] Alternatively, the connecting shaft is a hollow tubular structure with a through hole in the middle. The upper and lower ends of the connecting shaft are respectively provided with a first insertion part, and the upper rotor and the lower rotor are provided with a second insertion part at the center position to be inserted and engaged with the first insertion part; the first insertion part and the second insertion part are also bonded together.
[0023] Optionally, the first plug portion is a plug, and the second plug portion is a socket that engages with the plug.
[0024] Optionally, the radial extension and the extension magnet are connected by one or more of the following methods: bonding, insertion, ultrasonic welding, snap-fitting, etc.
[0025] Secondly, this application also provides a magnetic levitation motor, which is equipped with a stator and the aforementioned composite rotor.
[0026] This utility model has the following beneficial effects:
[0027] 1. The above-mentioned composite rotor has a simple structure. By cooperating with the connecting magnet and the radial extension, the magnetic field strength is improved, the magnetic circuit is optimized, and the rotor's torque and axial stiffness are increased, giving it better working performance.
[0028] 2. The composite rotor has many variations. By cleverly setting the positions of the permanent magnets on the upper and lower rotors, the magnetic circuit and magnetic field distribution are optimized, improving the working efficiency and stability of the rotor. It can be applied to a variety of different motors, and the control methods are diverse. The appropriate scheme can be selected as needed to optimize the working performance of the motor. Attached Figure Description
[0029] Figure 1 This is a three-dimensional structural schematic diagram of the composite rotor in Example 1;
[0030] Figure 2 This is a top view schematic diagram of the composite rotor in Example 1;
[0031] Figure 3 This is a three-dimensional structural diagram of the magnetic levitation motor in Example 1;
[0032] Figure 4 This is a schematic diagram of the AA cross-sectional structure of a magnetic levitation motor according to one embodiment of Example 1; the lines with arrows represent magnetic field lines;
[0033] Figure 5 This is a schematic diagram of the AA cross-sectional structure of the magnetic levitation motor in another embodiment of Example 1;
[0034] Figure 6 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 motor in Example 1.
[0035] Figure 7 This is a schematic diagram of the AA cross-sectional structure of the magnetic levitation motor in Example 2; the lines with arrows represent magnetic field lines;
[0036] Figure 8 This is a schematic diagram of the magnetic field lines distribution at a top-view angle for the upper and lower rotor layers of the magnetic levitation motor in Example 2.
[0037] Figure 9 This is a three-dimensional structural schematic diagram of the composite rotor in Example 3;
[0038] Figure 10 This is a schematic diagram of the magnetic field lines distribution at a top view angle of the upper rotor layer and the lower rotor layer of the magnetic levitation motor in Example 3.
[0039] Figure 11 This is a schematic diagram of the AA cross-sectional structure of the magnetic levitation motor in Example 3; the lines with arrows represent magnetic field lines;
[0040] Figure 12 This is a three-dimensional structural diagram of the magnetic levitation motor in Example 4;
[0041] Figure 13 This is a three-dimensional structural schematic diagram of the composite rotor in Example 4;
[0042] Figure 14 This is a schematic diagram of the magnetic field lines distribution at a top-view angle for the upper and lower rotor layers of the magnetic levitation motor in Example 4.
[0043] Figure 15 This is a schematic diagram of the AA cross-sectional structure of the magnetic levitation motor in Example 4; the lines with arrows represent magnetic field lines;
[0044] Figure 16 This is a three-dimensional structural diagram of the magnetic levitation motor in Example 5;
[0045] Figure 17 This is a schematic diagram of the AA cross-sectional structure of the magnetic levitation motor in Example 5; the lines with arrows represent magnetic field lines;
[0046] Figure 18 This is a schematic diagram of the magnetic field lines distribution at a top-view angle for the upper and lower rotor layers of the magnetic levitation motor in Example 5.
[0047] In the above figures, A is a top view of the upper rotor and B is a top view of the lower rotor. Detailed Implementation
[0048] 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 protection scope of the present utility model.
[0049] 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 between them. 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 between them. The terms "vertical," "horizontal," "left," "right," "upper," "lower," "inner," "outer," and "bottom," etc., used in this specification to indicate orientation or positional relationships are based on the orientation or positional relationships shown in the accompanying drawings and are only for the convenience of describing the present invention and simplifying the description, and do not 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 invention. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance.
[0050] 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.
[0051] Example 1
[0052] This embodiment provides a composite rotor, such as Figures 1-6 As shown, it includes a longitudinally arranged connecting shaft 12 and an upper rotor 11 and a lower rotor 13 vertically arranged at both ends of the connecting shaft. The upper rotor and the lower rotor are coaxial with the connecting shaft.
[0053] The connecting shaft is made of a non-magnetic material, such as plastic, aluminum alloy, copper alloy, or stainless steel. In this embodiment, the connecting shaft is a hollow or solid cylinder. This is because the rotor's levitation and rotation main magnetic circuits do not need to be closed through this connecting component.
[0054] The upper and lower rotor bodies are made of magnetically conductive material. The upper rotor extends radially outward along the body to form multiple circumferentially evenly distributed upper radial extensions 111, and the lower rotor extends radially outward to form multiple circumferentially evenly distributed lower radial extensions 131. The upper and lower radial extensions have the same specifications, and the radial extensions are made of magnetically conductive material.
[0055] In this embodiment, each rotor has four radial extensions and four connecting magnets of the same specifications. The specifications of the radial extensions and connecting magnets are consistent. In other embodiments, the number of radial extensions and connecting magnets on the upper and lower rotors can be reasonably adjusted, and are not limited to this embodiment.
[0056] In this embodiment, the radial extension and the upper / lower rotor body are designed as a single unit, or the radial extension and the upper / lower rotor body are fixedly connected by various existing methods.
[0057] To improve the rotor's torque and axial stiffness, radially magnetized connecting magnets 15 are fixedly embedded between adjacent radial extensions. The radial magnetization of the connecting magnets 15 means that they are directed towards or away from the rotor's axis along the rotor's radial direction. The connecting magnets on the upper rotor have the same polarity, and the connecting magnets on the lower rotor have the same polarity.
[0058] The connecting magnets (permanent magnets) embedded in the adjacent radial extensions of the rotor can provide an additional excitation magnetic field, enhancing the torque of the motor; in addition, the connecting magnets can provide a basic magnetic field, giving the rotor polarity, which can attract magnetic materials, and with the principle of minimum magnetic reluctance, the axial stiffness is further improved.
[0059] In this embodiment, as Figure 1 As shown, the radial extension has a fan-shaped tooth structure, and the connecting magnet 15 has a fan-ring structure. The grooves of the connecting magnet and the adjacent radial extension of the rotor are complementary in shape, forming a disk-shaped upper or lower rotor. In other embodiments, the shapes of the radial extension and the connecting magnet may also have other variations, and are not limited to the figures of this embodiment.
[0060] In other embodiments, the outer diameter of the connecting magnet of the fan ring is smaller than the outer diameter of the radial extension, and the fan ring magnet is recessed in the upper or lower rotor. Alternatively, in other embodiments, the thickness of the connecting magnet of the fan ring is smaller than the radial extension, and both have a surface located on the same horizontal plane. These embodiments are all variations of this embodiment and are all within the protection scope of this application.
[0061] In this embodiment, the upper radial extension 111 of the upper rotor and the lower radial extension 131 of the lower rotor are arranged symmetrically and overlappingly in projection. The magnetization directions of the two connecting magnets 15 that overlap in projection on the upper and lower rotors are opposite.
[0062] Based on the above configuration, during operation, the main magnetic circuit flows between the radial extension of the upper / lower rotor and the adjacent connecting magnets, and then completes the closed loop through the longitudinally arranged magnetic yoke of the corresponding stator.
[0063] For ease of understanding, this embodiment also provides a magnetic levitation motor, which includes the rotor described in this embodiment and a stator 2 disposed around the rotor. The stator includes a plurality of C-shaped first magnetic yokes 21 arranged in a ring around the outer periphery of the rotor, and a coil 22 for driving the rotor to levitate and rotate is wound around the middle of the C-shaped first magnetic yokes. In this embodiment, the coil includes a levitation drive coil and a rotation drive coil. The upper and lower ends of the C-shaped first magnetic yokes respectively extend radial arms in a radial direction.
[0064] A ring-shaped second back plate 23, made of non-magnetic material, can be horizontally fixed in the middle of the first magnetic yoke assembly of the stator. Alternatively, the second back plate 23 can be omitted.
[0065] The upper rotor 11 and the radial arm of the first magnetic yoke are basically in the same plane, and the lower rotor 13 and the lower radial arm of the C-shaped magnetic yoke are basically in the same plane.
[0066] Since the connecting shaft of the composite rotor in this embodiment is made of non-magnetic material, during operation, the main magnetic circuit does not pass through the connecting shaft. Instead, it flows through the upper radial arm of a C-shaped first magnetic yoke of the stator, the radial extension of the adjacent upper rotor, the adjacent connecting magnet, and the radial arm of another first magnetic yoke near the connecting magnet. Then, it flows downward along the longitudinal magnetic yoke axis to the radial extension of the lower rotor, the adjacent connecting magnet, and finally through the lower radial arm of the corresponding other first magnetic yoke, thus completing the closed loop of the main magnetic circuit.
[0067] The upper and lower rotors and the connecting shaft are fixedly connected. Optionally, the upper end of the connecting shaft is fixedly connected to the lower end face of the upper rotor, and the lower end of the connecting shaft is fixedly connected to the upper end face of the lower rotor. The connecting shaft is a hollow tubular structure. The main bodies of the upper and lower rotors are circular, and a central hole aligned with the through hole of the connecting shaft is provided along the center of the upper and lower rotors.
[0068] In other embodiments, the connecting shaft is a hollow tubular structure, with a first insertion portion at each of its upper and lower ends, and a second insertion portion at the center of the upper and lower rotors that engages with the first insertion portions; the first and second insertion portions are also bonded together. Specifically, the first insertion portion is a plug, and the second insertion portion is a socket that engages with the plug.
[0069] Optionally, the radial extension and the connecting magnet are fixedly connected by one or more of the following methods: bonding, insertion, ultrasonic welding, and snap-fitting.
[0070] like Figures 5-6 As shown, the working principle of the magnetic levitation motor is as follows:
[0071] Rotational working principle:
[0072] At a certain moment, the rotating coils of the two C-shaped first magnetic yokes, which are not radially symmetrical with respect to the radial extension of the rotor, are simultaneously energized, generating magnetic lines of force that flow axially upwards or downwards simultaneously. These magnetic lines of force pass through the first magnetic yoke, the radial extension of the upper rotor, the adjacent connecting magnet, and the radial arm of the adjacent first magnetic yoke, then flow axially downwards to the radial extension of the lower rotor and the adjacent connecting magnet, finally returning to the initial first magnetic yoke, completing the closed loop of the main magnetic circuit and forming two closed magnetic circuits distributed to the left and right. Since the path of this magnetic circuit at the air gap is not the shortest distance, the rotor will rotate counterclockwise to allow the magnetic lines of force to close through the shortest distance. When the pair of C-shaped first magnetic yokes aligns with the radial extension of the rotor they are pulling, the rotating coils on the other pair of C-shaped first magnetic yokes, which are 90° apart from the first pair, operate in the same manner as described above, pulling the rotor to rotate counterclockwise again. This pattern of energizing the rotating coils sequentially achieves continuous rotor rotation. Meanwhile, the rotation drive can also be controlled by using two pairs of C-shaped magnetic yokes that cross each other, in accordance with the above principles, to enhance the rotation drive force.
[0073] Suspension working principle:
[0074] like Figure 5 As shown, when all the suspension coils on the C-shaped yoke are energized and the current is adjusted to make the axial tension (magnetic drag torque) on the rotor equal, the rotor can achieve radially centered suspension. During the rotor's suspension process, its two radial degrees of freedom are active suspension, while the other three degrees of freedom are passive suspension. The active suspension mechanism of the rotor is achieved by adjusting the Maxwell forces around the rotor, increasing the resultant Maxwell force at the point where the air gap widens to suppress radial offset. For example, at a certain moment, when the rotor deviates radially, the suspension coil on the side with the widened air gap will increase the current, increasing the attractive force on that side to correct the radial offset.
[0075] In this embodiment, connecting magnets are embedded between the radial extensions of the original reluctance rotor. The connecting magnets provide an additional magnetic field to the rotor, which superimposes the magnetic field on top of the original electromagnetic field of the stator coil. This not only significantly increases the magnetic field strength, but also makes the improved main magnetic path shorter and the magnetic reluctance smaller, thus significantly improving the rotor's torque and axial stiffness.
[0076] Example 2
[0077] like Figures 7-8 As shown, this embodiment provides a composite rotor, which includes a longitudinally arranged connecting shaft 12 and an upper rotor 11 and a lower rotor 13 vertically arranged at both ends of the connecting shaft. The upper and lower rotors are coaxial with the connecting shaft. The connecting shaft is made of a non-magnetic material.
[0078] The upper and lower rotor bodies are made of magnetically conductive material. The upper rotor extends radially outward along the body to form multiple circumferentially evenly distributed upper radial extensions 111, and the lower rotor extends radially outward to form multiple circumferentially evenly distributed lower radial extensions 131. The upper and lower radial extensions have the same specifications, and the radial extensions are made of magnetically conductive material.
[0079] In this embodiment, the upper radial extension 111 of the upper rotor and the lower radial extension 131 of the lower rotor are arranged symmetrically and their projections overlap. The polarities of the connecting magnets on the upper rotor are the same, and the polarities of the connecting magnets on the lower rotor are the same.
[0080] The difference from Embodiment 1 is that the magnetization direction of the connecting magnets 15 at corresponding positions on the upper and lower rotors is the same. When the rotor configured in this way is matched with the stator with the annular second magnetic yoke described below, the main magnetic circuit can be further optimized.
[0081] To illustrate the working principle, this embodiment provides a magnetic levitation motor (see...). Figure 3 The stator used in this embodiment is a first magnetic yoke group consisting of a plurality of first magnetic yokes 21 arranged in a circle around the mover and a ring-shaped second magnetic yoke 23 fixedly arranged on the first magnetic yoke group. The second magnetic yoke is fixedly connected to all the first magnetic yokes.
[0082] In this embodiment, the first magnetic yoke includes a longitudinally arranged axial arm 21a and radial arms 21b extending radially from the upper and lower ends of the axial arm toward the rotor mounting position. The first magnetic yoke structure is similar to a C-shape, and a drive coil group 22 for driving the rotor to levitate and rotate is wound on the axial arm of the first magnetic yoke.
[0083] The second magnetic yoke 23 is vertically connected to the axial arm of the first magnetic yoke; the center of the annular second magnetic yoke is set to coincide with the central axis of the mover at the mover mounting position. In this embodiment, the second magnetic yoke 23 is further vertically connected to the middle of the axial arm of the first magnetic yoke, so that the stator is arranged symmetrically about the second magnetic yoke as the central axis.
[0084] like Figure 7 and 8 As shown, the main magnetic circuit is divided into two separate layers, upper and lower, and is radially symmetrical.
[0085] Since the stator in this embodiment is symmetrically distributed vertically with the second magnetic yoke as the center of symmetry, there are closed-loop main magnetic circuits symmetrically distributed vertically in the stator during operation. These two main magnetic circuits are controlled by two sets of drive coil groups 22 distributed vertically, 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.
[0086] The working principle is explained below using the upper half of the main magnetic circuit of the stator as an example. The lower half of the main magnetic circuit is symmetrically arranged with the upper half, so it is omitted here.
[0087] Working principle of rotor rotation
[0088] like Figure 6 As shown, at a certain moment, the rotating coils on the two first magnetic yokes 21 that are not radially symmetrical with respect to the radial extension of the rotor 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 one first magnetic yoke, the corresponding radial extension of the upper rotor, the adjacent connecting magnet, and flow to the other first magnetic yoke, and then close through the second magnetic yoke section between the two first magnetic yokes, forming two shorter closed main magnetic circuits distributed left and right on the upper part of the stator. Other operating principles are the same as in Embodiment 1.
[0089] 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 be achieved using rotors with staggered radial extensions for the upper and lower rotors, where the magnetic circuits flow in the same direction within the transverse yoke, thus enabling 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.
[0090] Working principle of rotor suspension
[0091] like Figure 3 As 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 so that the axial tension (magnetic drag torque) on the rotor is equal, the rotor can achieve radially centered levitation.
[0092] At a certain moment, when the top of the rotor experiences radial displacement, the suspension coil on the side with increased air gap in the upper part of the stator will increase the current, thereby increasing the attractive force on that side to correct the radial displacement of the rotor top. Similarly, when the bottom of the rotor experiences radial displacement, the suspension coil on the side with increased air gap in the lower part of the stator will increase the current, thereby increasing the attractive force on that side to correct the radial displacement of the rotor bottom.
[0093] Compared with Embodiment 1, the rotor in this embodiment can independently adjust the radial offset of the upper or lower part of the rotor by controlling the coil current of the first magnetic yoke in the stator. This not only improves the controllability of the rotor's radial horizontal offset and vertical axial position offset, but also realizes the adjustment of the rotor's tilt angle, changing it from the original passive control to active control, thereby greatly improving the stability of the rotor during high-speed operation.
[0094] With significantly improved rotor stability, the stator can carry a larger operating current during operation, thus significantly increasing rotor torque. The stator of this application can increase rotor torque by at least 10%.
[0095] Furthermore, compared to Embodiment 1, the main magnetic circuit formed by the rotor and stator in this embodiment is shorter, the magnetic reluctance is lower, the magnetic field strength is greater, and the rotor torque and axial stiffness are greater.
[0096] Example 3
[0097] This embodiment provides a composite rotor, which differs from that of Embodiment 2 in that:
[0098] like Figure 9 As shown, the radial extension of the rotor is made of magnetic material, the upper radial extension 111 of the upper rotor and the lower radial extension 131 of the lower rotor are staggered, and the magnetization direction of the connecting magnets 15 corresponding to the positions on the upper and lower rotors is the same.
[0099] In this embodiment, the upper radial extension 111 of the upper rotor and the lower radial extension 131 of the lower rotor are offset by 45°, and the specifications of the radial extensions and the connecting magnets are consistent. Since there are a total of 8 magnetic poles on the rotor, each at a 45° angle, the 45° offset results in opposite polarities.
[0100] This staggered arrangement of the upper and lower rotors allows for a smoother transition during rotor rotation and reduces torque fluctuations. The main magnetic circuit distribution in this scheme is comparable to that of a rotor with overlapping upper and lower main magnetic circuits.
[0101] Figure 10 The distribution of magnetic field lines in the upper and lower rotors is shown. Figure 11 This shows the distribution of magnetic field lines in the longitudinal section of the motor. The levitation and rotation principles of its rotor are the same as in Example 2, and will not be repeated here.
[0102] Example 4
[0103] This embodiment provides a composite rotor, which differs from Embodiment 1 in that:
[0104] like Figure 13As shown, in the composite rotor, the radial extension is a radially magnetized magnet, and the magnetization directions of the radial extension and the adjacent connecting magnet are opposite. Magnetic lines of force from the longitudinally arranged first yoke of the stator flow circumferentially between the radial extension and the adjacent connecting magnet along the rotor. Preferably, the radial extension and the connecting magnet are permanent magnets of the same shape.
[0105] The magnetization directions of the connecting magnets 15 at the corresponding positions on the upper and lower rotors are opposite; other settings are as described in Example 1.
[0106] The upper radial extension 111 of the upper rotor and the lower radial extension 131 of the lower rotor are arranged symmetrically and overlappingly in projection, or the two are arranged in an alternating manner.
[0107] In this embodiment, the mover is suitable for stators without a horizontal intermediate annular magnetic yoke or for intermediate annular connecting plates made of non-magnetic materials.
[0108] For ease of understanding, this embodiment also provides a magnetic levitation motor, which includes the rotor described in this embodiment and a stator 2 disposed around the rotor. The stator structure can be referred to in Embodiment 1. In other embodiments, the stator of the motor may omit the intermediate annular magnetic yoke structure.
[0109] Figure 14 The distribution of magnetic field lines in the upper and lower rotors is shown. Figure 5 The diagram shows the distribution of magnetic field lines in the longitudinal section of the motor. The levitation and rotation principles of its rotor are the same as in Example 1, and will not be repeated here.
[0110] Compared with the rotor of Embodiment 1, the rotor of this embodiment has radial extensions with opposite magnetization directions and connecting magnets alternately arranged, which not only greatly improves the magnetic field strength of the rotor and increases the magnetic field density per unit area, but also significantly reduces the magnetic reluctance, improves the magnetic induction intensity of the rotor, and significantly improves the torque and axial stiffness of the rotor.
[0111] Example 5
[0112] This embodiment provides a composite rotor, which differs from that of Embodiment 2 in that:
[0113] like Figure 13 As shown, in the composite rotor of this embodiment, the radial extension is a radially magnetized magnet, and the magnetization direction of the radial extension and the adjacent connecting magnet are opposite, so that the magnetic lines of force from the first magnetic yoke arranged longitudinally from the stator flow along the circumference of the rotor between the radial extension and the adjacent connecting magnet.
[0114] In this embodiment, the magnetization direction of the connecting magnets 15 at the corresponding positions on the upper and lower rotors is the same, and other settings are as described in Embodiment 3.
[0115] The upper radial extension 111 of the upper rotor and the lower radial extension 131 of the lower rotor are arranged symmetrically and overlappingly in projection, or the two are arranged in an alternating manner.
[0116] In this embodiment, the mover is suitable for a stator with a horizontal intermediate annular magnetic yoke.
[0117] For ease of understanding, this embodiment also provides a magnetic levitation motor, such as... Figure 16 The motor comprises the rotor described in this embodiment and a stator 2 disposed around the rotor. The stator includes a first magnetic yoke group consisting of a plurality of first magnetic yokes 21 arranged longitudinally in a circle around the rotor, and an annular second magnetic yoke 23 fixedly disposed on the first magnetic yoke group. The second magnetic yoke is fixedly connected to all the first magnetic yokes. For a specific description of the stator structure, please refer to Embodiment 2.
[0118] Figure 18 The distribution of magnetic field lines in the upper and lower rotors is shown. Figure 17 This shows the distribution of magnetic field lines in the longitudinal section of the motor. The levitation and rotation principles of its rotor are the same as in Example 2, and will not be repeated here.
[0119] Compared with the rotor of Embodiment 2, the rotor of this embodiment has radial extensions with opposite magnetization directions and connecting magnets arranged alternately, with the magnetization directions of the connecting magnets 15 corresponding to the positions on the upper and lower rotors being consistent. This not only significantly improves the magnetic field strength of the rotor and the magnetic field density per unit area, but also shortens the main magnetic circuit, which can significantly improve the rotor's torque and axial stiffness. Furthermore, since there are two independently controllable closed-loop main magnetic circuits symmetrically distributed in the stator and mover, independent control of the rotation and levitation torque of the upper and lower parts of the rotor can be achieved, improving the rotor's stability and torque.
[0120] 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.
[0121] 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 composite rotor, characterized in that, It includes a longitudinally arranged connecting shaft (12) and an upper rotor (11) and a lower rotor (13) vertically arranged at both ends of the connecting shaft. The outer sides of the upper rotor and the lower rotor are respectively symmetrically arranged with multiple circumferentially evenly distributed radial extensions. The main body of the upper rotor and the lower rotor is made of magnetic material. A radially magnetized connecting magnet (15) is embedded between adjacent radial extensions. The polarity of the connecting magnets on the same horizontal plane is consistent. The connecting shaft is made of non-magnetic material.
2. The composite rotor according to claim 1, characterized in that, The radial extension is a fan-shaped tooth structure, and the connecting magnet is a fan-ring structure. The grooves of the connecting magnet and the adjacent radial extension of the rotor are complementary in shape, forming a disc-shaped upper or lower rotor.
3. The composite rotor according to claim 1, characterized in that, The radial extension is made of magnetic material. The upper radial extension (111) of the upper rotor and the lower radial extension (131) of the lower rotor are arranged symmetrically and overlappingly. The magnetization directions of the connecting magnets (15) at the corresponding positions on the upper and lower rotors are opposite.
4. The composite rotor according to claim 3, characterized in that, The radial extension and the upper / lower rotor are designed as a single unit, or the radial extension and the upper / lower rotor are fixedly connected.
5. The composite rotor according to claim 1, characterized in that, The radial extension is made of magnetic material. The upper radial extension (111) of the upper rotor and the lower radial extension (131) of the lower rotor are arranged symmetrically and overlappingly. The magnetization direction of the connecting magnets (15) at the corresponding positions on the upper and lower rotors is the same.
6. The composite rotor according to claim 1, characterized in that, The radial extension is made of magnetic material. The upper radial extension (111) of the upper rotor and the lower radial extension (131) of the lower rotor are staggered. The magnetization direction of the connecting magnet (15) at the corresponding position on the upper and lower rotors is the same.
7. The composite rotor according to claim 6, characterized in that, The upper radial extension (111) of the upper rotor and the lower radial extension (131) of the lower rotor are offset by 45°, and the specifications of the radial extensions and the connecting magnets are consistent.
8. The composite rotor according to claim 1, characterized in that, The radial extension is a radially magnetized magnet, and the magnetization direction of the radial extension and the adjacent connecting magnet is opposite; the upper radial extension (111) of the upper rotor and the lower radial extension (131) of the lower rotor are arranged symmetrically and overlappingly in projection, and the magnetization direction of the connecting magnet (15) corresponding to the upper rotor and the lower rotor is opposite.
9. The composite rotor according to claim 8, characterized in that, The radial extension and the connecting magnet are permanent magnets of the same shape.
10. The composite rotor according to claim 1, characterized in that, The radial extension is a radially magnetized magnet. The magnetization direction of the radial extension is opposite to that of the adjacent connecting magnet. The upper radial extension (111) of the upper rotor and the lower radial extension (131) of the lower rotor are arranged symmetrically and overlappingly. The magnetization direction of the connecting magnet (15) at the corresponding position on the upper and lower rotors is consistent.
11. The composite rotor according to any one of claims 1 to 10, characterized in that, The upper end of the connecting shaft is fixedly connected to the lower end face of the upper rotor, and the lower end of the connecting shaft is fixedly connected to the upper end face of the lower rotor; the main bodies of the upper rotor and the lower rotor are circular, and a central hole aligned with the through hole of the connecting shaft is provided along the center of the upper rotor and the lower rotor. Alternatively, the connecting shaft is a hollow tubular structure, with a first insertion part provided at the upper and lower ends of the connecting shaft, and a second insertion part provided at the center of the upper rotor and the lower rotor to engage with the first insertion part; the first insertion part and the second insertion part are also bonded together.
12. A magnetic levitation motor, characterized in that, It is equipped with a stator and a composite rotor as described in any one of claims 1 to 11.