Magnetic resistance type magnetic suspension motor

Abstract

The invention belongs to the technical field of magnetic suspension motors, and discloses a magnetic resistance type magnetic suspension motor which comprises a magnetic resistance type rotor and a stator. The stator comprises a first magnet yoke group and an annular second magnet yoke, wherein the first magnet yoke group is composed of a plurality of first magnet yokes which are arranged in the circumferential direction and longitudinally arranged with the reluctance type rotor as the center, and the annular second magnet yoke is vertically fixed to the first magnet yoke group and connected with all the first magnet yokes. A driving coil group for driving the rotor to suspend and rotate is wound on the part, between the two adjacent first magnet yokes, of the second magnet yoke; the rotor comprises a non-magnetic connecting shaft, a soft magnetic upper rotor and a soft magnetic lower rotor, wherein the soft magnetic upper rotor and the soft magnetic lower rotor are fixed at two ends of the connecting shaft. The upper rotor extends along the radial arm direction of the top of the radial stator to form upper rotor teeth, and the lower rotor forms lower rotor teeth along the radial arm direction of the bottom of the radial stator. The magnetic suspension motor is simple and compact in structure, low in manufacturing cost, high in magnetic field utilization rate and space utilization rate and smaller in overall size.

Description

Technical Field

[0001] The present invention relates to the technical field of magnetic levitation motors, and in particular, to a reluctance type magnetic levitation motor. Background Art

[0002] Due to the combination of the advantages of magnetic levitation technology and bearingless motors, magnetic levitation motors achieve non-contact, low-friction, and high-precision operation of the rotor, and thus are widely used in technical fields such as industrial automation, semiconductors, medical health, 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 to drive the rotor to rotate and levitate. The stator includes a plurality of longitudinally arranged yokes arranged around the rotor, so that the magnetic force lines respectively pass through the closed magnetic circuits formed by the longitudinally arranged multiple groups of symmetrically arranged yokes and the permanent magnets on the corresponding rotor to form a rotating torque and a levitation torque. The types of rotors include reluctance type, permanent magnet type, and composite rotors, etc.

[0004] However, in practical applications, the stators of current magnetic levitation motors generally have a relatively complex structure. In the existing magnetic levitation motor stators, such as in the magnetic levitation motor with the publication number CN112865609A, as Figure 1 shown, in the stator assembly, the suspension coils and the drive coils are both arranged on the inverted L-shaped second iron core (i.e., the yoke). With such a stator, the number of coils installed is large, the volume is huge, and in order to reserve enough space for the coils, the stator volume is large, and there are also problems of low utilization rate of the electromagnetic field of the coils and poor magnetic collection effect. At the same time, the commonly used permanent magnet rotors in existing motors are prone to demagnetization, have a short working life, a large eddy current effect, generate a lot of heat, and the motor cooling cost is high.

[0005] Therefore, the existing technology needs to be further improved. Summary of the Invention

[0006] In view of the above problems, the present invention provides a reluctance type magnetic levitation motor, which uses a stator with a more compact structure, fewer coils, and better magnetic collection effect in cooperation with an improved reluctance type rotor, not only has a higher space utilization rate and lower manufacturing cost of the motor, but also has no demagnetization problem, improving the working reliability of the motor.

[0007] To solve the above problems existing in the prior art, the present application provides the following technical solutions: A reluctance type magnetic levitation motor, comprising: a reluctance type rotor and a stator, the stator comprising: a first yoke group composed of a plurality of longitudinally arranged first yokes circumferentially arranged around the reluctance type rotor, and an annular second yoke vertically fixed on the first yoke group, the second yoke being connected to all the first yokes; drive coil groups for driving the rotor to levitate and rotate are wound on portions of the second yoke located between two adjacent first yokes; The rotor includes a non-magnetic connecting shaft and an upper rotor and a lower rotor fixed at both ends of the connecting shaft; the upper rotor extends along the radial direction of the radial arm at the top of the stator to form a plurality of upper rotor teeth evenly distributed circumferentially, and the lower rotor extends along the radial direction of the radial arm at the bottom of the stator to form a plurality of lower rotor teeth evenly distributed circumferentially, and the upper rotor and the lower rotor are made of soft magnetic materials.

[0008] Optionally, the center of the annular second yoke is set to coincide with the rotor central axis of the rotor mounting position, and the second yoke is vertically connected to the middle position of the axial arm of the first yoke.

[0009] In an optional embodiment, in the reluctance type magnetic levitation motor, the upper rotor teeth of the upper rotor and the lower rotor teeth of the lower rotor are symmetric up and down and overlap in projection.

[0010] In another optional embodiment, the upper rotor teeth of the upper rotor and the lower rotor teeth of the lower rotor are symmetric up and down and are arranged in a staggered manner.

[0011] Optionally, in the reluctance type magnetic levitation motor, each drive coil group includes a suspension coil for the rotor suspension magnetic field and a rotation coil for providing a rotation magnetic field for the rotor.

[0012] In another optional embodiment, each drive coil group is a coil that simultaneously provides a rotation magnetic field and a suspension magnetic field for the rotor.

[0013] Optionally, in the reluctance type magnetic levitation motor, the second yoke includes a plurality of second annular laminations stacked on top of each other in the stacking direction, and the stacking direction is set axially or radially.

[0014] Optionally, the second yoke is formed by stacking a plurality of second annular laminations on top of each other. The first yoke is formed by stacking a plurality of C-shaped first laminations front and back. In other embodiments, the second yoke is formed by stacking a plurality of annular laminations arranged concentrically inside and outside.

[0015] Optionally, in a reluctance type magnetic levitation motor, radial arms extend from the upper and lower ends of the axial arm of the first yoke, forming a C-shaped structure.

[0016] Optionally, in another reluctance type magnetic levitation motor, a positioning slot hole for connecting the axial arm of the first yoke is provided on the second yoke, and the second yoke is fixedly connected to the first yoke through the positioning slot hole.

[0017] Alternatively, the outer peripheral side wall / inner peripheral side wall of the second yoke is clamped and bonded with the inner side wall / outer side wall of the axial arm of the first yoke, or fixed connection is carried out in other ways.

[0018] Optionally, in the reluctance type magnetic levitation motor, 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 provided 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; Alternatively, the connecting shaft is a hollow tubular structure with a through hole provided in the middle, and first insertion portions are respectively provided at the upper and lower ends of the connecting shaft, and second insertion portions for insertion and cooperation with the first insertion portions are provided at the central positions of the upper rotor and the lower rotor; the first insertion portion and the second insertion portion are also adhesively cooperated.

[0019] Optionally, the reluctance type magnetic levitation motor further includes: a controller and a sensor that is controlled and connected to the controller, 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 magnitude of the drive coil group.

[0020] The present invention has the following beneficial effects: 1. The reluctance rotor structure adopted by this motor is simple and convenient to use. It does not require the use of permanent magnet materials, greatly reducing the rotor manufacturing cost. There will be no demagnetization problem, high reliability, long working life, less eddy current, less heat generation, and less motor cooling cost.

[0021] 2. The stator structure adopted by the reluctance type magnetic levitation motor is simple and compact, with a small number of coils used, good magnetic collection effect, and can greatly reduce the manufacturing cost and maintenance cost of the motor stator.

[0022] 3. Through the mutual cooperation of the above-mentioned reluctance type rotor and stator, not only the manufacturing cost of the motor is effectively reduced, the problems of easy demagnetization and large eddy current effect are avoided, but also the magnetic field utilization rate is improved, the overall motor is flattened, the space utilization rate of the motor is improved, the overall structure of the motor is more compact, and the volume is more miniaturized. Description of the Drawings

[0023] Figure 1 It is an exploded structural schematic diagram of the stator of a magnetic levitation bearingless motor in the prior art; Figure 2 It is a three-dimensional structural schematic diagram of the magnetic levitation bearingless motor in Embodiment 1; the closed-loop route with arrows in the figure represents the main magnetic path; Figure 3 Isometric view of the stator of the magnetic levitation bearingless motor of Embodiment 1; Figure 4 Side view of the stator of the magnetic levitation bearingless motor of Embodiment 1; Figure 5 Schematic longitudinal sectional structure diagram of the motor applying the stator structure of Embodiment 1; The closed-loop route with arrows in the figure represents the main magnetic circuit; Figure 6 Schematic diagram of the magnetic field line distribution from the top view angle of the upper rotor layer and the lower rotor layer of the magnetic levitation motor of Embodiment 1; A is the top view of the upper rotor, and B is the top view of the lower rotor; Figure 7 Isometric structure diagram of the rotor adopted in the motor of Embodiment 1; Figure 8 Schematic sectional structure diagram of the reluctance rotor of Embodiment 1; A is the reluctance rotor of one embodiment; B is the reluctance rotor of another embodiment. Detailed implementation manners

[0024] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without making creative efforts fall within the protection scope of the present invention. It should be noted that when an element is expressed as "fixed to" another element, it can be directly on the other element, or there can be one or more intermediate elements therebetween. When an element is expressed as "connected to" another element, it can be directly connected to the other element, or there can be one or more intermediate elements therebetween. The terms "vertical", "horizontal", "left", "right", "up", "down", "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 invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the present invention. In addition, the terms "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0025] Unless otherwise defined, all technical and scientific terms used in this specification have the same meaning as commonly understood by those skilled in the technical field to which this invention belongs. The terms used in this specification in the description of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used in this specification includes any and all combinations of one or more of the related listed items. In addition, the technical features involved in different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0026] Embodiment 1 As Figure 2 、 5 and shown in 6, this embodiment provides a reluctance-type magnetic levitation motor, which includes: a reluctance-type rotor 1 and a stator 2. The stator includes: a first yoke group composed of a plurality of longitudinally arranged first yokes 21 circumferentially arranged with the reluctance-type rotor as the center, and an annular second yoke 23 vertically fixed on the first yoke group. The second yoke is connected to all the first yokes; a drive coil group 24 for driving the rotor to levitate and rotate is wound on the part of the second yoke located between two adjacent first yokes.

[0027] Rotor structure In this motor, as Figure 7 shown, the rotor is a reluctance-type rotor, which includes 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 extends along the radial arm direction of the top of the stator in the radial direction to form a plurality of circumferentially uniformly distributed upper rotor teeth 111, and the lower rotor extends along the radial arm direction of the bottom of the stator in the radial direction to form a plurality of circumferentially uniformly distributed lower rotor teeth 131. The upper rotor and the lower rotor are made of soft magnetic materials.

[0028] The connecting shaft is made of non-magnetic materials, such as plastics, aluminum alloys, copper alloys, nickel alloys or stainless steels, etc. In this embodiment, the connecting shaft is a hollow or solid cylinder. This is because the main magnetic circuits for the suspension and rotation of the rotor do not need to be closed through this connecting piece.

[0029] The number and shape specifications of the upper rotor teeth 111 and the lower rotor teeth are the same. The upper rotor and the lower rotor are made of soft magnetic materials, such as pure iron low-carbon steel, soft ferrite, iron aluminum alloy, etc. Specifically, the shapes and specifications of the upper rotor and the lower rotor are set to be the same.

[0030] As Figure 8In the rotor connection method shown in A, the connecting shaft is a hollow tubular structure with a through hole 121 provided in the middle; the upper end of the connecting shaft is fixedly connected to the lower end surface of the upper rotor, and the lower end of the connecting shaft is fixedly connected to the upper end surface of the lower rotor; the main bodies of the upper rotor and the lower rotor are circular, and a central hole 14 that runs through and aligns with the through hole of the connecting shaft is provided along the center of the upper rotor and the lower rotor. The upper rotor, the lower rotor and the connecting shaft can be fixedly connected by means such as bonding, ultrasonic welding, and clamping.

[0031] As Figure 8 In another rotor connection method shown in B, the connecting shaft is a hollow tubular structure with a through hole 121 provided in the middle, and first plug-in parts 142 are respectively provided at the upper and lower ends of the connecting shaft. Second plug-in parts for plug-in cooperation with the first plug-in parts are provided at the central positions of the upper rotor and the lower rotor. On this basis, for strengthening the connection, the first plug-in part and the second plug-in part are also adhesively cooperated or other fixedly connected. Optionally, the first plug-in part is a plug, and the second plug-in part is a jack for clamping with the plug. The installation of this plug-in connection method can be pre-installed by plugging, and then the connection strength between the upper and lower rotors and the connecting shaft is strengthened by other means. The installation accuracy is higher, and the problem of possible eccentric error between the upper and lower rotors and the connecting shaft that may exist in the installation process of the rotor in Embodiment 1 is avoided.

[0032] In this embodiment, the upper rotor teeth 111 of the upper rotor and the lower rotor teeth 111 of the lower rotor are symmetrically arranged up and down and overlap in projection.

[0033] As Figure 2 、 5 As shown in 6, when this reluctance rotor is assembled with the stator of this embodiment into a magnetic levitation motor, the upper rotor teeth and the lower rotor teeth are respectively substantially in a plane with the upper and lower radial arms of the first magnetic yoke of the corresponding stator. There is an air gap between the upper rotor teeth of the upper rotor and the upper radial arm of the first magnetic yoke, and there is an air gap between the lower rotor teeth of the lower rotor and the lower radial arm of the first magnetic yoke.

[0034] The structure of the above reluctance rotor is simple, does not use any permanent magnet materials, greatly reduces the manufacturing cost of the rotor, also avoids the demagnetization problem caused by permanent magnet materials, has higher reliability, less eddy current, less heat generation, and less motor cooling cost.

[0035] Stator structure In this embodiment, as Figures 3 - 4 shown, the stator includes the aforementioned first magnetic yoke group and an annular second magnetic yoke 23 vertically fixed on the first magnetic yoke group. The drive coil group 24 is arranged on the connecting part between two adjacent first magnetic yokes on the second magnetic yoke. 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 installation position.

[0036] During operation, two closed loops that are symmetrically distributed radially up and down are formed between the second yoke connection part where the main magnetic path coil is located, the upper / lower part of the first yoke on the left and right sides of each drive coil group, and the corresponding rotor teeth. The upper and lower closed main magnetic paths share a magnetic path in part of the second yoke.

[0037] In this embodiment, the first yoke includes an axially arranged axial arm 21a and radial arms 21b that extend radially from the upper and lower ends of the axial arm to the rotor mounting position respectively. The structure of the first yoke is in a similar C-shaped structure.

[0038] Specifically, in this embodiment, the number of the first yokes is 8, and the number of rotor magnetic poles cooperating with them is 2, 4, or 6, etc.; in other embodiments, the number of the first yokes can also be 6, 10, or more, and the number of rotor teeth of the rotor can be 2, 4, or 8.

[0039] In the switched reluctance motor: LCM(N s , N r ) = q * N r , LCM(N s , N r ) > N s > N r q, where q = N s / 2, LCM is the least common multiple, N s is the number of yokes, and N r is the number of rotor teeth.

[0040] In this embodiment, for the convenience of installing the second yoke and connecting it to the first yoke to ensure that magnetic lines of force can be connected between the second yoke and the adjacent first yoke, the following settings are made: a positioning slot hole (not shown in the figure) for the axial arm of the first yoke to penetrate is provided on the second yoke 23, and the second yoke and the first yoke are fixedly connected, such as by bonding, screwing, welding, or riveting and other fixed connection methods.

[0041] In other embodiments, the outer peripheral side wall / inner peripheral side wall of the second yoke is clamped and bonded with the inner side wall / outer side wall of the axial arm of the first yoke, or fixed connection is carried out in other ways.

[0042] The second yoke includes a plurality of second annular laminations that are laminated with each other along the lamination direction. The lamination direction is axially or radially arranged, and the first yoke is composed of a plurality of first laminations laminated along the lamination direction. The laminations can be made of silicon steel sheets.

[0043] In this embodiment, the second yoke is formed by a plurality of second annular laminations laminated up and down. The first yoke is formed by a plurality of C-shaped first laminations laminated front and back.

[0044] In other embodiments, the second yoke is formed by laminating a plurality of concentrically arranged annular laminations.

[0045] In this embodiment, each driving coil group includes a suspension coil for the suspension magnetic field of the rotor and a rotation coil for providing a rotating 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, with higher control flexibility.

[0046] In other embodiments, each driving coil group is a coil that simultaneously provides a rotating magnetic field and a suspension magnetic field for the rotor. At this time, a single coil provides a rotating magnetic field and a suspension magnetic field for the permanent magnet rotor. The structure with only one coil is simpler, but has higher requirements for the control system.

[0047] Working principle of the motor Rotation principle of the rotor: As Figure 4 and Figure 6 shown, at a certain moment, the rotation coils on the connecting parts of the two second yokes 23 that are radially symmetric to the rotor teeth of the rotor are simultaneously energized. The magnetic force lines excited thereby flow counterclockwise to the left (or clockwise to the right), respectively, upward along the upper part of the axial arm of the first yoke and simultaneously downward along the lower part of the axial arm of the first yoke to the radial arm, then successively pass through the upper rotor teeth / lower rotor teeth corresponding to the radial arm and flow horizontally to an adjacent rotor tooth, the corresponding adjacent first yoke, and return to the second yoke, thus forming two upper closed magnetic circuits distributed left and right, and at the same time forming a lower closed main magnetic circuit symmetric to the upper closed magnetic circuit. Since the path of this magnetic circuit at the air gap is not the shortest distance, based on the principle of the shortest magnetic path, the rotor will rotate clockwise until the radial arm of the first yoke is aligned with the rotor teeth, so that the magnetic force lines can be closed through the shortest distance. At this time, the rotation coils on another pair of first yokes that form a certain angle with this pair of first yokes work in the same way as above, and pull the rotor to continue rotating clockwise. By energizing the rotation coils at the corresponding positions in the stator in sequence according to the above rules, the continuous rotation of the rotor is realized. Thus, it can be seen that the suspension and rotation of the reluctance rotor are both realized based on the reluctance principle of the shortest path of magnetic flux closure.

[0048] In other cases, the rotational drive can also be controlled by using two pairs of cross-shaped C-type yokes simultaneously according to the above rules to enhance the rotational driving force.

[0049] Since the upper and lower closed magnetic circuits share the second magnetic ring where the coil is located, the flow directions of the magnetically symmetric upper and lower magnetic circuits are the same. During operation, by controlling a group of driving coil groups located in the second magnetic ring part, the upper and lower two groups of main magnetic circuits symmetrically arranged are simultaneously controlled, thereby realizing the simultaneous regulation of the upper and lower parts of the rotor.

[0050] Suspension principle of the rotor: AsFigure 5 As shown, the suspension of the rotor in this embodiment is mainly achieved by generating a suction force between the first yoke and the rotor. When the suspension coils on the second yoke of the stator are energized and the current magnitude is adjusted so that the pulling force (magnetic resistance torque) axially applied to the rotor is equal, the rotor can achieve radial centering suspension. Thus, it can be seen that the axial suspension of the rotor in this embodiment is achieved by relying on the magnetic resistance principle of the shortest magnetic flux path closure. When the rotor undergoes a radial offset, the suspension coils on the side with an increased air gap of the stator will increase the current, causing the attractive force on this side to increase to correct the radial offset of the rotor.

[0051] Based on the arrangement of a set of coils on the annular second yoke of the above-mentioned stator, not only the number of coils is reduced, and the coil layout is in the middle of the stator, facilitating the flat design and miniaturization of the stator volume; moreover, this design enables the above-mentioned set of coils to control the upper and lower two symmetrically arranged short magnetic paths on two adjacent first yokes, not only making the main magnetic path shorter and the magnetic resistance smaller, but also ensuring the magnetic field strength and torque. In addition, since the annular second yoke magnetically connects the adjacent first yokes that are independent of each other, the magnetic leakage of the first yoke is effectively reduced, and the magnetic field utilization rate is improved.

[0052] In this embodiment, the stator further includes a housing, and the above-mentioned first yoke and second yoke are arranged inside the housing and fixedly connected to the housing.

[0053] The stator further includes: a controller and a sensor that is control-connected to the controller. 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 magnitude of the drive coil group. Other structures (such as sensors, etc.) arranged inside the stator refer to the prior art and are omitted here.

[0054] Embodiment 2 This embodiment provides a reluctance type magnetic suspension motor, which includes the stator described in Embodiment 1 and a reluctance type rotor.

[0055] In this embodiment, the difference between the reluctance type rotor and that in Embodiment 1 is as follows: The upper rotor teeth 111 of the upper rotor and the lower rotor teeth 111 of the lower rotor are symmetrically arranged up and down and are offset. Preferably, the offset angle between the upper rotor teeth 111 of the upper rotor and the corresponding lower rotor teeth 111 of the lower rotor is 45°. The main magnetic path distribution of this scheme is equivalent to that of the main magnetic path with the upper and lower rotors overlapping, and both form a magnetic path closed loop along the path with the minimum magnetic resistance. This way of offsetting the upper and lower rotors can make the transition of the rotor smoother during rotation and the torque ripple smaller.

[0056] Other settings of the motor in this embodiment refer to Embodiment 1, and its working principle also refers to Embodiment 1.

[0057] The device embodiments described above are merely illustrative. The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed to multiple network units. Some or all of the modules can be selected according to actual needs to achieve the purpose of the solution of this embodiment. It can be understood that for those of ordinary skill in the art, equivalent substitutions or changes can be made according to the technical solution of the present invention and the concept of the present invention, and all such changes or substitutions should fall within the protection scope of the appended claims of the present invention.

Claims

1. A reluctance type magnetic levitation motor, characterized in that: include: A reluctance type rotor (1) and a stator (2), the stator comprising: a first magnetic yoke group consisting of a plurality of first magnetic yokes (21) arranged longitudinally and circumferentially with the reluctance type rotor as the center, and an annular second magnetic yoke (23) vertically fixed to the first magnetic yoke group, the second magnetic yoke being connected to all the first magnetic yokes; a driving coil group (24) for driving the rotor to suspend and rotate is wound around a portion of the second magnetic yoke located between two adjacent first magnetic yokes; The rotor comprises 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 extends in the direction of a radial arm at the top of a radial stator to form a plurality of upper rotor teeth (111) evenly distributed in the circumferential direction, and the lower rotor extends in the direction of a radial arm at the bottom of a radial stator to form a plurality of lower rotor teeth (131) evenly distributed in the circumferential direction; the upper rotor and the lower rotor are made of soft magnetic material.

2. The reluctance type magnetic levitation motor according to claim 1, characterized in that: The upper rotor teeth (111) of the upper rotor and the lower rotor teeth (111) of the lower rotor are vertically symmetrical and are arranged with overlapping projections.

3. The reluctance type magnetic levitation motor according to claim 1, characterized in that: The upper rotor teeth (111) of the upper rotor and the lower rotor teeth (111) of the lower rotor are vertically symmetrical and staggered.

4. The reluctance type magnetic levitation motor according to claim 1, characterized in that: Each driving coil group includes a suspension coil for providing a rotor suspension magnetic field and a rotating coil for providing a rotating magnetic field for the rotor.

5. The reluctance type magnetic levitation motor according to claim 1, characterized in that: Each driving coil group is a coil that provides a rotating magnetic field and a suspension magnetic field for the rotor at the same time.

6. The reluctance type magnetic levitation motor according to claim 1, characterized in that: The second magnetic yoke comprises a plurality of second annular laminations which are stacked one on another along a stacking direction, and the stacking direction is axial or radial.

7. The reluctance type magnetic levitation motor according to claim 1, characterized in that: The upper and lower ends of the axial arm of the first magnetic yoke extend radial arms respectively, forming a C-shaped structure.

8. The reluctance type magnetic levitation motor according to claim 1, characterized in that: The second magnetic yoke is provided with a positioning slot hole for connecting the axial arm of the first magnetic yoke, and the second magnetic yoke is fixedly connected to the first magnetic yoke through the positioning slot hole.

9. The reluctance type magnetic levitation motor according to claim 1, characterized in that: The connecting shaft is a hollow tubular structure, the upper end of the connecting shaft is fixedly connected to the lower end surface of the upper rotor, and the lower end of the connecting shaft is fixedly connected to the upper end surface of the lower rotor; the main bodies of the upper rotor and the lower rotor are circular, and a center hole (14) aligned with the through hole of the connecting shaft is provided along the center of the upper rotor and the lower rotor; or, the upper and lower ends of the connecting shaft are respectively provided with a first plug-in portion, and the central position of the upper rotor and the lower rotor is provided with a second plug-in portion that is plug-matched with the first plug-in portion, and the first plug-in portion and the second plug-in portion are also bonded together.

10. The reluctance type magnetic levitation motor according to claim 1, characterized in that: Also 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 adjust the current direction and magnitude of the driving coil group.

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