Novel magnetic suspension bearingless motor stator, magnetic suspension motor and centrifugal pump

Abstract

The utility model belongs to the technical field of magnetic suspension motors, and discloses a novel magnetic suspension bearingless motor stator, a magnetic suspension motor and a centrifugal pump, the novel magnetic suspension bearingless motor stator comprises a first magnet yoke group and an annular second magnet yoke vertically fixed on the first magnet yoke group, the first magnet yoke set is composed of a plurality of first magnet yokes which are arranged in the circumferential direction with the rotor installation position as the center and are longitudinally arranged, and the second magnet yoke is connected with all the first magnet yokes. Each first magnet yoke comprises an axial arm which is longitudinally arranged and a radial arm which extends from at least one end of the axial arm to the rotor mounting position in the radial direction, and a driving coil group which is used for driving the rotor to suspend and rotate is wound on a connecting part, which is positioned between two adjacent first magnet yokes, on the second magnet yoke. The novel magnetic suspension bearingless motor stator is simple and compact in structure, the number of used coils is reduced, the magnetic collection effect is good, the manufacturing cost is reduced, the space utilization rate is improved, the overall structure of a motor is more compact, and the size is smaller.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of magnetic suspension motor, especially to a novel magnetic suspension bearingless motor stator and magnetic suspension motor, centrifugal pump. BACKGROUND

[0002] At present, the magnetic suspension motor is widely applied in various fields such as semiconductor, health care, smart home and industrial automation and the like based on the advantages that there is no mechanical contact between the rotor and the stator, the noise and abrasion in operation are small, pollution is less, and operation efficiency and precision are high.

[0003] With the development of technology, the pursuit of more optimal performance of the magnetic suspension motor in various technical fields, the structure of the magnetic suspension motor tends to be complex, and the operation stability and control precision are gradually improved.

[0004] However, the stator of the current magnetic suspension motor is generally complex in structure, and the existing magnetic suspension motor stator, such as the magnetic suspension motor disclosed in CN112865609A, as shown in the drawings, in the stator assembly, the suspension coil and the driving coil are arranged in the second core (i.e. the magnetic yoke) of inverted L shape, the number of coils installed on the stator arranged in this way is large, the volume is large, and in order to reserve enough space for the coils, the stator volume is large, and the electromagnetic field utilization rate of the coils is low, and the magnetic collection effect is poor. Figure 1

[0005] Therefore, the prior art needs to be further improved. UTILITY MODEL CONTENTS

[0006] In view of the above problems, the utility model provides a novel magnetic suspension bearingless motor stator and magnetic suspension motor and centrifugal pump, the motor stator is not only compact in structure, but also has less number of coils used, high space utilization rate and good magnetic collection effect.

[0007] To solve the above problems, the application provides the following technical scheme:

[0008] A novel magnetic suspension bearingless motor stator comprises a first magnetic yoke group and a ring-shaped second magnetic yoke fixed vertically on the first magnetic yoke group, the first magnetic yoke group is composed of a plurality of first magnetic yokes arranged in a circumferential direction with a rotor mounting position as the center, and the second magnetic yoke is connected with all the first magnetic yokes, the first magnetic yoke comprises a longitudinally arranged axial arm and a radial arm extending radially from at least one end of the axial arm to the rotor mounting position, and a driving coil group for driving the rotor to float and rotate is wound on the connecting part between two adjacent first magnetic yokes on the second magnetic yoke.

[0009] ​In operation, the second yoke connecting part where the main magnetic circuit coil is located, the upper and lower parts of the first yoke on the left and right sides of each driving coil group, and the corresponding rotor teeth form two closed loops that are distributed vertically symmetrically. The two closed main magnetic circuits coincide in the same direction on the second yoke.

[0010] Optionally, in the magnetic levitation motor stator, the center of the annular second yoke is arranged to coincide with the center axis of the rotor in the rotor mounting position; and the second yoke is vertically connected to the middle part of the first yoke.

[0011] Optionally, in the magnetic levitation motor stator, the second yoke comprises a plurality of second annular laminations that are stacked in a stacking direction, and the stacking direction is arranged in the axial direction or the radial direction.

[0012] Optionally, in the magnetic levitation motor stator, each driving coil group is a coil that provides both a rotating magnetic field and a levitation magnetic field for the rotor.

[0013] Optionally, in the magnetic levitation motor stator, each driving coil group comprises 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.

[0014] Optionally, in the magnetic levitation motor stator, the axial arms of the first yoke each extend a radial arm at the upper and lower ends, forming a C-shaped structure. The upper and lower radial arms correspond to the upper and lower magnetic poles of the rotor, respectively, so as to form a closed magnetic circuit between the two adjacent rotor magnetic poles, the corresponding two adjacent first yokes, and the second yoke connecting part between the two first yokes.

[0015] Optionally, in the magnetic levitation motor stator, the upper end of the axial arm of the first yoke extends a radial arm for the position of the rotor magnetic pole, forming a L-shaped structure. The axial arm of the first yoke corresponds to the plane where the rotor teeth on the short axis of the rotor are located.

[0016] Optionally, the magnetic levitation motor stator further comprises a controller and a sensor connected to the controller for control, wherein the sensor is used to detect the radial and axial positions of the rotor, and the controller is used to regulate the current direction and size of the driving coil group.

[0017] Optionally, in the magnetic levitation motor stator, the second yoke is provided with a positioning slot hole for connecting the axial arm of the first yoke, and the second yoke is fixedly connected to the first yoke through the positioning slot hole.

[0018] In a second aspect, the application also provides a magnetic levitation motor, which is installed with the magnetic levitation motor stator described above.

[0019] In a third aspect, the application also provides a centrifugal pump, which is installed with the magnetic levitation motor described above.

[0020] The utility model has the advantages of the following:

[0021] 1. The motor stator has simple and compact structure, less number of coils used, good magnetic collection effect, and can greatly reduce the manufacturing cost and maintenance cost of the motor stator.

[0022] 2. The motor stator is provided with coils only on the horizontal annular second magnetic yoke, so that the height of the first magnetic yoke group can be reduced, the motor is set in a flattened manner, the space utilization of the motor is improved, the overall structure of the motor is more compact, and the motor is more miniaturized. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 It is an exploded schematic view of the structure of the prior art magnetic suspension bearingless motor stator.

[0024] Figure 2 It is a schematic view of the three-dimensional structure of the magnetic suspension bearingless motor stator of Example 1. The closed loop line with an arrow in the figure represents the main magnetic circuit.

[0025] Figure 3 It is a side view of the magnetic suspension bearingless motor stator of Example 1.

[0026] Figure 4 It is a schematic view of the three-dimensional structure of the motor using the stator of Example 1. The closed loop line with an arrow in the figure represents the main magnetic circuit.

[0027] Figure 5 It is a schematic view of the longitudinal cross-sectional structure of the motor using the stator structure of Example 1. The closed loop line with an arrow in the figure represents the main magnetic circuit.

[0028] Figure 6 It is a schematic view of the magnetic field line distribution of the top rotor layer and the bottom rotor layer of the magnetic suspension motor of Example 1. A is a top view of the upper rotor, and B is a top view of the lower rotor.

[0029] Figure 7 It is a schematic view of the three-dimensional structure of the rotor used in the motor of Example 1. DETAILED DESCRIPTION

[0030] 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.

[0031] 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.

[0032] Example 1

[0033] like Figures 2-3 As shown, this embodiment provides a magnetic levitation motor stator, which includes: a first magnetic yoke group and an annular second magnetic yoke 23 vertically fixed on the first magnetic yoke group. The first magnetic yoke group is composed of a plurality of first magnetic yokes 21 arranged longitudinally around the mover mounting position. 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 mover mounting position. A drive coil group 24 for driving the rotor to levitate and rotate is wound on the connecting part between two adjacent first magnetic yokes on the second magnetic yoke.

[0034] The second magnetic yoke 23 is connected to the axial arm of the first magnetic yoke perpendicularly; the center of the annular second magnetic yoke is arranged to coincide with the center axis of the rotor installation position.

[0035] In operation, the second magnetic yoke connecting part where the main magnetic circuit coil is located, the upper part / lower part of the first magnetic yoke on the left and right of each driving coil group, and the corresponding rotor teeth form two closed loops that are distributed symmetrically in the up-down direction. The two closed main magnetic circuits share the magnetic circuit in the part of the second magnetic yoke.

[0036] As Figure 4 shown, to facilitate the explanation of the working principle of the stator of the present embodiment, the present embodiment provides a motor applying the stator, and the present embodiment takes a reluctance type rotor as an example for illustration. The reluctance type rotor is composed 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 rotor and the lower rotor are made of soft magnetic material, and the upper rotor and the lower rotor are provided with corresponding rotor teeth.

[0037] The rotation principle of the rotor: as Figure 4 and Figure 6 shown, at a certain moment, the rotating coils on the two second magnetic yoke 23 connecting parts that are not radially symmetrical with the rotor teeth of the rotor are not energized at the same time, thereby exciting the magnetic lines of force to flow counterclockwise to the left side (or clockwise to the right side) along the upper part of the axial arm of the first magnetic yoke and at the same time along the lower part of the axial arm of the first magnetic yoke, and then flow to the radial arm, and then pass through the corresponding upper rotor teeth / lower rotor teeth of the radial arm in sequence and flow horizontally to the adjacent another rotor tooth, and then flow to the corresponding adjacent another first magnetic yoke and return to the second magnetic yoke, thereby forming two upper closed magnetic circuits that are distributed on the left and right sides, and at the same time forming a lower closed main magnetic circuit that is symmetrical to the upper closed magnetic circuit. Since the path of the magnetic circuit at the air gap is not the shortest distance, based on the shortest principle of the magnetic circuit, the rotor will rotate clockwise until the radial arm of the first magnetic yoke is aligned with the rotor teeth, so that the magnetic lines of force can be closed through the shortest distance. At this time, the rotating coils on the other pair of first magnetic yokes that are at a certain angle with the pair of first magnetic yokes work in the same way as described above, and again pull the rotor to continue to rotate clockwise, and the rotating coils in the corresponding positions in the stator are energized in sequence according to the above rule, thereby realizing the continuous rotation of the rotor.

[0038] In other cases, the rotating drive can also use two pairs of C-shaped magnetic yokes that are crossed at right angles at the same time to control the rotation according to the above rule, so as to enhance the rotating driving force.

[0039] Since the upper and lower closed magnetic circuits share the second magnetic ring where the coils are located, the flow directions of the symmetrically distributed magnetic circuits are consistent. In operation, by controlling a group of driving coil groups located in the part of the second magnetic ring, the upper and lower two groups of main magnetic circuits arranged symmetrically are controlled at the same time, thereby realizing the simultaneous regulation of the upper and lower parts of the rotor.

[0040] The principle of rotor levitation: such as Figure 5 As shown, the rotor levitation in this embodiment is mainly achieved by the attraction between the first magnetic yoke and the rotor. When the levitation coils on the second magnetic yoke on the stator are 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 relies on the reluctance principle of shortest path magnetic flux closure. When the rotor deviates radially, the levitation coils on the side with increased air gap in the stator will increase the current, increasing the attractive force on that side to correct the radial deviation. The adjustment of axial deviation is similar.

[0041] The arrangement of a set of coils on the annular second magnetic yoke of the stator not only reduces the number of coils and allows them to be positioned in the middle of the stator, facilitating a flattened and miniaturized stator design, but also enables the set of coils to control the two symmetrically arranged short magnetic circuits on the adjacent first magnetic yokes. This results in a shorter main magnetic circuit, lower magnetic reluctance, and ensures both magnetic field strength and torque. Furthermore, because the annular second magnetic yoke connects the independent adjacent first magnetic yokes, it effectively reduces magnetic leakage of the first magnetic yokes and improves magnetic field utilization.

[0042] 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 mover mounting position, respectively. The first magnetic yoke structure has a C-shaped structure.

[0043] 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.

[0044] 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.

[0045] In this embodiment, in order to facilitate the installation of the second magnetic yoke and its connection with the first magnetic yoke, and to ensure that the magnetic lines of force can be connected between the second magnetic yoke and the adjacent first magnetic yoke, the following settings are made: the second magnetic yoke 23 is provided with a positioning slot (not shown in the figure) through which the axial arm of the first magnetic yoke passes, and the second magnetic yoke and the first magnetic yoke are fixedly connected, for example by bonding, screwing, welding or riveting.

[0046] In other embodiments, the outer circumferential wall / inner circumferential wall of the second magnetic yoke is connected to the inner wall / outer wall of the axial arm of the first magnetic yoke by clamping and bonding, or other fixed connection.

[0047] The second magnetic yoke comprises a plurality of second annular laminations stacked in a stacking direction, and the first magnetic yoke comprises a plurality of first laminations stacked in the stacking direction. The laminations can be silicon steel sheets.

[0048] In this embodiment, the second magnetic yoke is composed of a plurality of second annular laminations stacked vertically. The first magnetic yoke is composed of a plurality of C-shaped first laminations stacked vertically.

[0049] In other embodiments, the second magnetic yoke is composed of a plurality of annular laminations concentrically arranged inside and outside.

[0050] In this embodiment, each drive coil group includes a suspension coil for providing a suspension magnetic field for the rotor and a rotation coil for providing a rotation magnetic field for the rotor. The suspension and rotation of the rotor can be independently controlled by controlling the suspension coil or the rotation coil, respectively, providing higher control flexibility.

[0051] In other embodiments, each drive coil group is a coil that provides both a rotation magnetic field and a suspension magnetic field for the rotor. In this case, a single coil provides both a rotation magnetic field and a suspension magnetic field for the permanent magnet rotor. The structure using only one coil is simpler, but requires a higher control system.

[0052] In this embodiment, only the above-mentioned reluctance-type rotor is used as an example for principle explanation, and the application range of the stator is not limited to this. The stator of the present application can be applied to various types of rotors, such as reluctance-type rotors, permanent magnet-type rotors, and composite-type rotors.

[0053] In this embodiment, the stator further includes a housing, and the first magnetic yoke and the second magnetic yoke are arranged inside the housing and fixedly connected to the housing. Other structures (such as sensors) arranged inside the stator are described in the prior art and are omitted here.

[0054] The motor further includes a controller and a sensor connected to the controller for control, wherein the sensor is used to detect the radial and axial positions of the rotor, and the controller is used to regulate the current direction and size of the drive coil group. Other structures of the motor are described in the prior art and are not described here.

[0055] In addition, the present embodiment also provides a magnetic levitation motor, which installs the magnetic levitation motor stator of the present embodiment, and the rotor used is any existing rotor, not limited to the reluctance rotor of the present embodiment.

[0056] The embodiment also provides a centrifugal pump, which is installed with the magnetic suspension motor of the aforementioned embodiment.

[0057] The device embodiments described above are only illustrative, wherein the units described as separate components can or can not be physically separated, and the components displayed as units can or can not be physical units, i.e., can be located in one place or can be distributed to multiple network units. Part or all of the modules can be selected to achieve the purpose of the embodiment scheme according to actual needs. It can be understood that, for those skilled in the art, equivalent replacement or change can be made according to the technical scheme of the utility model and the utility model concept, and all these changes or replacements shall belong to the protection scope of the claims attached to the utility model.

Claims

1. A novel magnetic levitation bearingless motor stator, characterized by, The application relates to a novel magnetic suspension bearingless motor stator. The first magnetic yoke group is composed of a plurality of longitudinally arranged first magnetic yokes (21) arranged in a circle with the mover mounting position as the center, and a ring-shaped second magnetic yoke (23) is fixed perpendicularly on the first magnetic yoke group, the second magnetic yoke is connected with all the first magnetic yokes, and the center of the ring-shaped second magnetic yoke is arranged to coincide with the mover center axis of the mover mounting position; the first magnetic yoke comprises longitudinally arranged axial arms (21a) and radially extending radial arms (21b) from at least one end of the axial arms to the mover mounting position, and the second magnetic yoke is wound with a driving coil group (24) for driving the rotor to suspend and rotate on the connecting part between two adjacent first magnetic yokes.

2. A novel magnetic levitation bearingless motor stator according to claim 1, characterized in that, Each driving coil group comprises a suspension coil for providing a suspension magnetic field for the rotor and a rotating coil for providing a rotating magnetic field for the rotor.

3. A novel magnetic levitation bearingless motor stator according to claim 1, characterized in that, Each driving coil group is a coil for providing a rotating magnetic field and a suspension magnetic field for the rotor.

4. A novel magnetic levitation bearingless motor stator according to claim 1, characterized in that, The second magnetic yoke is perpendicularly connected to the middle part of the axial arms of the first magnetic yokes.

5. A novel magnetic levitation bearingless motor stator according to claim 4, characterized in that, The second magnetic yoke is composed of a plurality of second ring-shaped laminations arranged in a stacking direction, and the stacking direction is axially or radially arranged.

6. A novel magnetic levitation bearingless motor stator according to claim 5, characterized in that, The upper and lower ends of the axial arms of the first magnetic yokes respectively extend out radial arms (21b) to form a C-shaped structure; or the upper end of the axial arms of the first magnetic yokes extends out a radial arm (21b) to form an inverted L-shaped structure.

7. A novel magnetic levitation bearingless motor stator according to claim 1, characterized in that, The second magnetic yoke is provided with a positioning slot hole for connecting the axial arms of the first magnetic yokes, and the second magnetic yoke is fixedly connected with the first magnetic yokes through the positioning slot hole.

8. A novel magnetic levitation bearingless motor stator according to claim 1, characterized in that, The application further relates to a controller and a sensor connected with the controller for detecting the radial and axial positions of the rotor, and the controller is used for regulating the current direction and size of the driving coil group. The novel magnetic suspension bearingless motor stator is installed.

9. A magnetic levitation motor, characterized by, The magnetic suspension motor is installed.

10. A centrifugal pump characterized by ​

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