Magnetic suspension motor stator, magnetic suspension motor and centrifugal pump

Abstract

The utility model belongs to the technical field of magnetic suspension motors, and discloses a magnetic suspension motor stator, a magnetic suspension motor and a centrifugal pump. The magnetic suspension motor stator comprises a first magnet yoke group and an annular second magnet yoke, wherein the first magnet yoke group consists of a plurality of first magnet yokes which are circumferentially arranged by taking a rotor mounting position as a center and are longitudinally arranged; the annular second magnet yoke is fixedly arranged on the first magnet yoke group; the second magnet yoke is connected with all the first magnet yokes; the first magnet yoke comprises an axial arm which is longitudinally arranged and a radial arm which radially extends from at least one end of the axial arm to the rotor mounting position, and a first driving coil group which is used for driving the rotor to suspend and rotate is wound on the axial arm of the first magnet yoke. The magnetic suspension motor stator is simple in structure, convenient to use, good in magnetic collection effect, capable of greatly improving the magnetic field utilization rate of the motor and improving the operation stability and torque of the rotor, wide in application range and capable of being matched with different types of rotors to work.

Description

Technical Field

[0001] This utility model relates to the field of magnetic levitation motor technology, and in particular to a magnetic levitation motor stator, a magnetic levitation motor, and a centrifugal pump. Background Technology

[0002] Magnetic levitation motors combine the advantages of magnetic levitation technology and bearingless motors, achieving contactless, low-friction, and high-precision rotor operation. As a result, they are widely used in fields such as industrial automation, semiconductors, medical and health care, and smart homes.

[0003] The working principle of a magnetic levitation bearingless motor is based on the magnetic force provided by the energized stator windings, which drives the rotor to rotate and levitate. The stator includes multiple longitudinally arranged magnetic yokes surrounding the rotor, so that the magnetic lines of force pass through the closed magnetic circuits formed by the multiple symmetrically arranged magnetic yokes and the corresponding permanent magnets on the rotor, generating rotational torque and levitation torque. The rotor types include reluctance type, permanent magnet type, and composite type rotors.

[0004] However, in practical applications, the stators of the existing magnetic levitation motors mentioned above, based on their traditional structural design, generally suffer from problems such as high magnetic leakage, poor magnetic collection effect, and low utilization of the spatial magnetic field.

[0005] Therefore, the existing technology needs further improvement. Utility Model Content

[0006] To address the aforementioned problems, this utility model provides a magnetic levitation motor stator. This magnetic levitation motor stator has a simple structure, is easy to use, and has a good magnetization effect, which can greatly improve the magnetic field utilization rate of the motor and improve the rotor's running stability and torque.

[0007] To address the above problems, this application provides the following technical solution:

[0008] A magnetic levitation motor stator includes: a first magnetic yoke group consisting of a plurality of longitudinally arranged first magnetic yokes circumferentially arranged around a rotor mounting position, and an annular second magnetic yoke fixedly disposed on the first magnetic yoke group, wherein the second magnetic yoke is connected to all the first magnetic yokes.

[0009] The first magnetic yoke includes a longitudinally arranged axial arm and a radial arm extending radially from at least one end of the axial arm toward the rotor mounting position. A first drive coil group for driving the rotor to levitate and rotate is wound on the axial arm of the first magnetic yoke.

[0010] Optionally, in the stator of the magnetic levitation motor, the second magnetic yoke 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 rotor central axis of the rotor mounting position.

[0011] Based on the above, in the stator of the magnetic levitation motor, the second magnetic yoke is vertically connected to the middle position of the first magnetic yoke.

[0012] In one alternative embodiment, radial arms extend from the upper and lower ends of the axial arm of the first magnetic yoke.

[0013] The aforementioned first magnetic yoke has a C-shaped structure, with the upper and lower radial arms corresponding to the upper and lower magnetic poles of the long-shaft rotor, respectively, thereby forming a closed-loop magnetic circuit between two adjacent or non-adjacent long-shaft rotor magnetic poles, the corresponding first magnetic yoke, and the second magnetic yoke connecting part between these two first magnetic yokes.

[0014] In an alternative embodiment, the upper end of the first axial arm of the yoke extends a radial arm relative to the rotor pole position.

[0015] The first magnetic yoke has an inverted L-shaped structure. The stator with this first magnetic yoke is suitable for mating with a short-shaft rotor, and the axial arm of the first magnetic yoke corresponds to the plane where the rotor teeth on the short-shaft rotor are located.

[0016] Optionally, in the stator of the magnetic levitation motor, the second magnetic yoke is provided with a positioning hole through which the axial arm of the first magnetic yoke passes, and the second magnetic yoke and the first magnetic yoke are fixedly connected.

[0017] Optionally, in the stator of the magnetic levitation motor, the second magnetic yoke comprises a plurality of second annular laminations stacked together along a stacking direction, wherein the stacking direction is axial or radial.

[0018] In one alternative embodiment, each first drive coil group is a coil that simultaneously provides a rotating magnetic field and a levitation magnetic field to the rotor, and the first drive coil group is disposed above and / or below the second magnetic yoke.

[0019] In an optional second embodiment, each first drive coil group includes a levitation coil for levitation magnetic field of rotor and a rotating coil for providing rotation magnetic field of rotor.

[0020] Based on the above, optionally, each group of first drive coils is positioned above and / or below the second magnetic yoke, or the levitation coil and rotating coil of each group of drive coils are positioned at one of the locations above or below the second magnetic yoke.

[0021] Optionally, in the stator of the magnetic levitation motor, a second drive coil group for driving the rotor to levitate and rotate is wound on the portion of the second magnetic yoke located between two adjacent first magnetic yokes (i.e., the connecting portion).

[0022] Based on the above, the second drive coil group includes a levitation coil that provides a levitation magnetic field for the rotor and a rotating coil that provides a rotating magnetic field for the rotor.

[0023] Secondly, this application also provides a magnetic levitation motor, which is equipped with the aforementioned magnetic levitation motor stator.

[0024] Thirdly, this application also provides a centrifugal pump equipped with the aforementioned magnetic levitation motor.

[0025] This utility model has the following beneficial effects:

[0026] 1. The stator of the magnetic levitation motor provided by this utility model uses a ring-shaped second magnetic yoke to connect the independent first magnetic yokes that are distributed in a ring. This allows the leakage magnetic field of each first magnetic yoke to be fully utilized through the connected ring-shaped magnetic yoke, thereby improving the magnetic collection effect of the stator, increasing the utilization rate of the magnetic field, and thus improving the working efficiency of the rotor. Furthermore, when the rotor rotates from one first magnetic yoke to another, the magnetic field of the second magnetic yoke plays a higher transition role, allowing the magnetic field in the transition to be supplemented, and the rotor to transition more smoothly and evenly during rotation.

[0027] 2. The stator is symmetrically distributed vertically with the second magnetic yoke as the center of symmetry. Therefore, during operation, the stator contains symmetrically distributed closed-loop main magnetic circuits. These two main magnetic circuits are controlled by two sets of first drive coils distributed vertically, respectively, thus achieving independent control of the upper and lower parts of the rotor. This not only allows adjustment of the rotor's vertical axial and radial offset but also facilitates precise adjustment of the rotor's tilt angle. It transforms the rotor tilt angle and suspension control from passive to active control, significantly improving the rotor's operational stability. Due to the high stability of the rotor driven by this stator, the rotor torque can be significantly increased. The stator of this application can increase the rotor torque by at least 10%.

[0028] 3. The stator of the magnetic levitation motor can achieve multi-dimensional control through the cooperation of the first drive coil group and the second drive coil group, making the rotor control more flexible and variable, and effectively improving control accuracy and stability.

[0029] 4. The magnetic levitation motor stator described in this application has a wide range of applications and can be used with various types of rotors, such as reluctance rotors, permanent magnet rotors, and composite rotors. Attached Figure Description

[0030] Figure 1 This is a three-dimensional structural diagram of the stator structure in Example 1;

[0031] Figure 2 This is a three-dimensional structural diagram of the motor with the stator structure of Example 1, where the closed loop with arrows represents the main magnetic circuit;

[0032] Figure 3This is a longitudinal cross-sectional view of the motor with the stator structure of Example 1; the closed loop with arrows in the figure represents the main magnetic circuit.

[0033] Figure 4 This is a schematic diagram of the longitudinal cross-sectional structure of the stator structure and its application in Example 2; the closed loop with arrows in the figure represents the main magnetic circuit. Figure 4 A, Figure 4 B and Figure 4 C represents a schematic diagram of three different implementations of the stator in Example 2;

[0034] Figure 5 This is a schematic diagram of the longitudinal cross-sectional structure of the stator structure of Example 3 and its application; the closed loop with arrows in the figure represents the main magnetic circuit.

[0035] Figure 6 This is a schematic diagram of the rotor structure;

[0036] Figure 7 This is a three-dimensional structural diagram of the stator structure in Example 4;

[0037] Figure 8 This is a three-dimensional structural diagram of the motor with the stator structure of Example 4. Detailed Implementation

[0038] 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.

[0039] 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.

[0040] Example 1

[0041] like Figure 1 As shown, this embodiment provides a magnetic levitation motor stator, which includes: a first magnetic yoke group composed of a plurality of first magnetic yokes 21 arranged circumferentially around the rotor mounting position and arranged in a longitudinal direction, and an annular second magnetic yoke 23 fixedly disposed on the first magnetic yoke group, wherein the second magnetic yoke is connected to all the first magnetic yokes.

[0042] 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 rotor central axis of the rotor mounting position.

[0043] 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.

[0044] In other embodiments, the position of the second magnetic yoke 23 can be set slightly above or below the middle of the axial arm of the first magnetic yoke, and can be adjusted as needed. These variations are all within the scope of protection of this application. This solution can mitigate the adverse effects of rotor center of gravity shift caused by load, such as rotor tilting. This is because the magnetic circuit at the offset end of the second magnetic yoke is shorter, the magnetic resistance is lower, and the relative output force is larger, which can effectively balance the effects of center of gravity shift.

[0045] 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 C-shaped, and a first drive coil group 22 for driving the rotor to levitate and rotate is wound on the axial arm of the first magnetic yoke.

[0046] The stator employing the aforementioned C-shaped first magnetic yoke is suitable for use with a long-shaft rotor. The upper and lower radial arms of the first magnetic yoke correspond to the upper and lower rotor teeth of the long-shaft rotor, respectively, thereby forming a closed-loop magnetic circuit between the rotor teeth of two adjacent or non-adjacent long-shaft rotors, the corresponding first magnetic yoke, and the second magnetic yoke portion located between these two first magnetic yokes.

[0047] Specifically, in this embodiment, the number of first magnetic yokes is 8, and the number of rotor magnetic poles that cooperate with them is 2, 4, or 6, etc.; in other embodiments, the number of first magnetic yokes can also be 6, 10 or more, and the number of rotor teeth of the rotor can be 2, 4 or 8; 2 or 4.

[0048] In this embodiment, to facilitate the installation of the second magnetic yoke and its connection with the first magnetic yoke, and to ensure that magnetic lines of force can be connected between the second magnetic yoke and the adjacent first magnetic yoke, the following settings are made:

[0049] The second magnetic yoke 23 is provided with a positioning hole (not shown in the figure) through which the axial arm of the first magnetic yoke passes. The second magnetic yoke and the first magnetic yoke are fixedly connected, for example by bonding, screwing, welding or riveting.

[0050] The second magnetic yoke comprises a plurality of second annular laminations stacked together along a stacking direction, which can be axial or radial. The annular laminations may be made of silicon steel sheets.

[0051] In this embodiment, the second magnetic yoke is composed of multiple second annular laminates stacked one on top of the other. The first magnetic yoke is composed of multiple C-shaped first laminates stacked one on top of the other.

[0052] In other embodiments, the second magnetic yoke is formed by stacking multiple concentric annular laminations.

[0053] like Figure 1 As shown, in this embodiment, a first driving coil group 22 is respectively provided above the second magnetic yoke and below the second magnetic yoke.

[0054] like Figure 2 As shown, each first drive coil group includes a levitation coil 22a that provides a levitation magnetic field for the rotor and a rotating coil 22b that provides a rotating magnetic field for the rotor. This method uses more coils but places lower demands on the control system. The levitation and rotation of the rotor can be independently controlled by controlling either the levitation coil or the rotating coil, resulting in greater control flexibility.

[0055] In other variations, each first drive coil group is a single coil that simultaneously provides both a rotating magnetic field and a levitation magnetic field to the rotor. In this case, a single coil provides both the rotating and levitation magnetic fields to the permanent magnet rotor. While this single-coil structure is simpler, it places higher demands on the control system.

[0056] Traditional longitudinally arranged magnetic yokes (or coil cores) are set up independently. During operation, in addition to the closed main magnetic circuit formed between the energized magnetic yoke and the corresponding rotor magnetic pole, the magnetic yoke also releases unused magnetic lines of force in the side directions other than the main magnetic circuit direction, resulting in a large leakage magnetic field and a problem of low magnetic field utilization.

[0057] In the stator of this application, since the annular second magnetic yoke connects the independent first magnetic yokes that are distributed in annularly, during operation, the leakage magnetic field to the side of the originally independent first magnetic yokes can be fully utilized by forming other magnetic circuits through the connected annular magnetic yokes, thereby improving the magnetic collection effect of the stator, increasing the utilization rate of the magnetic field, and thus improving the working efficiency of the rotor.

[0058] Based on this, since the stator of 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 first 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.

[0059] like Figure 2 and Figure 3 As shown, this embodiment also provides a motor that uses the stator described above and a long-shaft reluctance rotor in cooperation. The rotor consists of a non-magnetic connecting shaft 12 and an upper rotor 11 and a lower rotor 13 fixed at both ends of the connecting shaft. The upper and lower rotors are made of soft magnetic material and have corresponding rotor teeth.

[0060] The following explanation of the working principle uses the main magnetic circuit of the upper half of the stator as an example. The main magnetic circuit of the lower half of the stator is symmetrically arranged with the upper half, so it is omitted here.

[0061] The working principle of the stator in this embodiment is as follows:

[0062] Working principle of rotor rotation:

[0063] like Figure 2 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, and magnetic lines of force are excited to flow upward (or downward) axially. The main magnetic lines of force pass through one first magnetic yoke, the corresponding upper rotor tooth, and flow horizontally to the other rotor tooth of the upper rotor, the other first magnetic yoke, and close at the second magnetic yoke between the two first magnetic yokes, forming two upper 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 clockwise so that the magnetic lines of force can close through the shortest distance. When the pair of first magnetic yokes aligns with the upper rotor tooth of the rotor it pulls, the rotating coils on the other pair of first magnetic yokes set at a 90° angle to the pair of first magnetic yokes work in the same way as above, and pull the rotor to rotate clockwise again. The rotating coils at the corresponding positions in the stator are energized in sequence according to the above pattern, thereby realizing the continuous rotation of the rotor.

[0064] In other cases, 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 rules, to enhance the rotation drive force.

[0065] The lower half of the stator coil operates in the same way as described above, as long as the direction of the main magnetic circuit flowing through the shared second magnetic circuit in both the upper and lower halves of the stator is consistent (e.g., Figure 3 As shown in the diagram, the coordinated operation of the upper and lower magnetic circuits can be achieved. By coordinating the control of the rotating coils in the upper and lower halves of the stator, the rotational torque of the rotor can be increased, thereby improving the stability and accuracy of the rotor.

[0066] Working principle of rotor suspension:

[0067] like Figure 3 As shown, the rotor levitation in this embodiment is mainly achieved by the attraction 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 (magnetic reluctance torque) on the rotor equal, the rotor can achieve radially centered levitation. Therefore, the axial levitation of the rotor in this embodiment is achieved by relying on the reluctance principle of shortest path magnetic flux closure.

[0068] 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.

[0069] Therefore, this application can independently adjust the radial offset of the upper or lower part of the rotor, thereby not only improving the controllability of the radial horizontal offset and the vertical axial position offset of the rotor, but also realizing the control of the rotor's tilt angle, turning it from the original passive control to active control, thereby greatly improving the stability of the rotor during high-speed operation.

[0070] 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%.

[0071] Figure 2 and Figure 3 Only the main magnetic circuit is shown in the figure; other secondary magnetic circuits are omitted.

[0072] In this embodiment, only the above-described reluctance rotor is used as an example for principle explanation; the application scope of this stator is not limited to this. The stator of this application can be applied to various types of rotors, such as reluctance rotors, permanent magnet rotors, and composite rotors.

[0073] In this embodiment, the stator further includes a housing, and the first and second magnetic yokes are disposed inside the housing and fixedly connected to the housing.

[0074] The stator further 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.

[0075] For other internal structures of the stator, please refer to the prior art.

[0076] Example 2

[0077] like Figure 4 As shown, this embodiment provides a magnetic levitation motor, which differs from Embodiment 1 in that: only one first drive coil group 22 is wound on each first magnetic yoke 21, and this first drive coil group 22 is located above or below the second magnetic yoke.

[0078] In one implementation, such as Figure 4 A and Figure 4 As shown in Figure B, each of the first drive coil groups 22 includes a levitation coil 22a that provides a levitation magnetic field for the rotor and a rotating coil 22b that provides a rotating magnetic field for the rotor. This method uses more coils but places lower demands on the control system. The levitation and rotation of the rotor can be independently controlled by controlling either the levitation coil or the rotating coil, resulting in greater control flexibility.

[0079] In another implementation, such as Figure 4 As shown in Figure C, the first drive coil group 22 is a coil that simultaneously provides both a rotating magnetic field and a levitation magnetic field to the rotor. In this configuration, the rotating magnetic field and levitation magnetic field provided by the stator to the rotor are adjusted simultaneously by controlling this coil on the first yoke. This configuration simplifies the coil setup and reduces the cost of using the coil, but it places higher demands on the stator control system.

[0080] For other structural configurations of the motor in this embodiment, please refer to Embodiment 1. Since the first drive coil group 22 in this embodiment is only located in the upper or lower half of the stator, its main magnetic circuit is only distributed in the upper or lower half. The working principle of the stator driving the rotor to rotate and levitate is described in Embodiment 1.

[0081] In this embodiment, only the above-described reluctance rotor is used as an example for principle explanation; the application scope of this stator is not limited to this. The stator of this application can be applied to various types of rotors, such as reluctance rotors, permanent magnet rotors, and composite rotors.

[0082] Example 3

[0083] This embodiment provides a magnetic levitation motor, which differs from Embodiment 1 in that the levitation coil 22a and the rotating coil 22b of each set of drive coils are respectively located above and below the second magnetic yoke.

[0084] like Figure 5 As shown, in this embodiment, a levitation coil 22a is disposed above the second magnetic yoke of each first magnetic yoke, and a rotating coil 22b is disposed below the second magnetic yoke of each first magnetic yoke. In other cases, the positions of the levitation coil 22a and the rotating coil 22b are reversed.

[0085] The rotor's levitation is controlled by a levitation coil located above the second yoke, and its rotation is controlled by a rotating coil located below the second yoke. This configuration reduces the difficulty of controlling the rotor's levitation and rotation.

[0086] For other structural configurations of the motor in this embodiment, please refer to Embodiment 1. Since the levitation coil 22a and the rotating coil 22b of the first drive coil group in this embodiment are respectively located in the upper half and lower half of the stator, the levitation main magnetic circuit and the rotating main magnetic circuit are respectively distributed in the upper half or lower half of the stator. The working principle of the stator driving the rotor to rotate and levitate is also referred to Embodiment 1.

[0087] In this embodiment, only the above-described reluctance rotor is used as an example for principle explanation; the application scope of this stator is not limited to this. The stator of this application can be applied to various types of rotors, such as reluctance rotors, permanent magnet rotors, and composite rotors.

[0088] Example 4

[0089] like Figure 7 As shown, this embodiment provides a stator for a magnetic levitation motor, comprising: a first magnetic yoke group consisting of a plurality of longitudinally arranged first magnetic yokes 21 arranged circumferentially around a rotor mounting position; and an annular second magnetic yoke 23 fixedly mounted on the first magnetic yoke group, the second magnetic yoke being connected to all the first magnetic yokes. The second magnetic yoke 23 is vertically connected to the middle of the axial arm of the first magnetic yoke. The center of the annular second magnetic yoke is set to coincide with the rotor central axis of the rotor mounting position.

[0090] 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 towards the rotor mounting position. The first magnetic yoke structure has a C-shaped appearance, and a first drive coil group 22 for driving the rotor to levitate and rotate is wound around the axial arm of the first magnetic yoke. In this embodiment, each first drive coil group includes a levitation coil for providing a levitation magnetic field for the rotor and a rotating coil for providing a rotational magnetic field for the rotor.

[0091] Based on this, a second drive coil group 24 for assisting in driving the rotor to levitate and rotate is wound on the portion of the second magnetic yoke 23 located between two adjacent first magnetic yokes 21 (i.e., the connecting portion).

[0092] During operation, the first drive coil group 22 wound on the axial arm of the first magnetic yoke provides the main driving force for the levitation and suspension of the rotor, while the second drive coil group 24 set on the second magnetic yoke 23 plays an auxiliary adjustment role according to the state of the rotor, in order to improve the control accuracy and stability of the rotor.

[0093] To explain the working principle of this stator, such as Figure 8 As shown, this embodiment provides a motor, which includes a stator of this embodiment and a reluctance rotor (with the same structure as in embodiment 1), which will be described as an example.

[0094] The specific principle is as follows: Figure 8 As shown, the thick black arrow represents the magnetic circuit formed by the first driving coil on the first yoke, and the light gray arrow represents the magnetic circuit of the second driving coil. By adjusting the direction and magnitude of the current in the second driving coil, the magnetic field it generates can enhance or weaken the magnetic circuit of the first driving coil.

[0095] At a certain moment, if the rotor as a whole experiences radial displacement, in addition to adjusting the current of the first drive coil, the current of the second drive coil on the side with the larger stator air gap can be increased to make the auxiliary magnetic circuit generated by the second drive coil aligned with the magnetic circuit of the first drive coil, thereby strengthening the original magnetic field; thus increasing the attractive force on that side to correct the radial displacement of the rotor at that point.

[0096] Alternatively, the current in the second drive coil on the side with the smaller stator air gap can be reduced so that the auxiliary magnetic circuit generated by the second drive coil is opposite in direction to the magnetic circuit of the first drive coil, thereby reducing the original magnetic field at this point and causing the rotor to deflect radially at this point.

[0097] In another scenario, when the rotor as a whole experiences axial displacement (such as falling), the axial attraction of the stator on the rotor is increased by increasing the current of the corresponding second drive coil, causing the rotor to move upward, correcting its axial displacement, and improving its axial stiffness.

[0098] Other stator configurations in this embodiment can be found in Embodiment 1.

[0099] As can be seen, the motor in this embodiment has two different sets of drive coils, the stator has multiple adjustment methods, the rotor control is more flexible and versatile, the control dimensions are more numerous, and the rotor control accuracy and stability are higher.

[0100] 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.

[0101] 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 magnetic levitation motor stator, characterized in that, include: A first magnetic yoke group consists of a first magnetic yoke (21) arranged longitudinally around the rotor mounting position and a second magnetic yoke (23) fixed on the first magnetic yoke group. The second magnetic yoke is connected to all the first magnetic yokes. The first magnetic yoke includes a longitudinally arranged axial arm (21a) and a radial arm (21b) extending radially from at least one end of the axial arm toward the rotor mounting position. A first drive coil group (22) for driving the rotor to levitate and rotate is wound on the axial arm of the first magnetic yoke.

2. The magnetic levitation motor stator according to claim 1, characterized in that, 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 rotor center axis of the rotor mounting position.

3. The stator of the magnetic levitation motor according to claim 2, characterized in that, The second magnetic yoke is vertically connected to the middle of the first magnetic yoke.

4. The stator of the magnetic levitation motor according to claim 2, characterized in that, Radial arms (21b) extend from the upper and lower ends of the axial arm of the first magnetic yoke.

5. The stator of the magnetic levitation motor according to claim 1, characterized in that, Each first drive coil group is a coil that simultaneously provides a rotating magnetic field and a levitation magnetic field to the rotor, and the first drive coil group (22) is located above and / or below the second yoke.

6. The stator of the magnetic levitation motor according to claim 1, characterized in that, Each first drive coil group includes a levitation coil (22a) for levitation magnetic field for rotor and a rotating coil (22b) for providing rotating magnetic field for rotor.

7. The stator of the magnetic levitation motor according to claim 6, characterized in that, Each first drive coil group (22) is positioned above and / or below the second yoke, or the levitation coil (22a) and rotating coil (22b) of each drive coil group are positioned above or below the second yoke.

8. The stator of the magnetic levitation motor according to claim 4, characterized in that, A second drive coil group (24) is wound on the portion of the second yoke located between two adjacent first yokes to assist in driving the rotor to levitate and rotate.

9. The stator of the magnetic levitation motor according to claim 8, characterized in that, The second drive coil group (24) includes a levitation coil for levitation magnetic field of rotor and a rotating coil for providing rotation magnetic field of rotor.

10. The stator of the magnetic levitation motor according to claim 8, characterized in that, Also includes: The controller and sensors connected to the controller are used to detect the radial and axial positions of the rotor, and the controller is used to regulate the direction and magnitude of the current in the first drive coil group and the second drive coil group.

11. A magnetic levitation motor, characterized in that, It is equipped with a magnetic levitation motor stator as described in any one of claims 1 to 10.

12. A centrifugal pump, characterized in that, It is equipped with the magnetic levitation motor as described in claim 11.

Images