CN111541331B

CN111541331B - Magnetic suspension motor and stator structure thereof

Info

Publication number: CN111541331B
Application number: CN202010455082.4A
Authority: CN
Inventors: 黄苏丹; 陈晨; 曹广忠; 符兴东; 杨晓生
Original assignee: Shenzhen University
Current assignee: Shenzhen University
Priority date: 2020-05-26
Filing date: 2020-05-26
Publication date: 2022-04-12
Anticipated expiration: 2040-05-26
Also published as: CN111541331A

Abstract

The embodiment of the invention discloses a magnetic suspension motor and a stator structure thereof. Wherein, this magnetic levitation motor's stator structure includes: a plurality of first multiphase coil units arranged in a first direction; wherein a total length of any one of the first poly-phase coil units occupied in the first direction is equal to the pole pitch; any one of the first multi-phase coil units includes a plurality of first single-phase coils arranged to be wound in a first direction; any one of the first single-phase coils comprises a plurality of first single-turn coils which are connected in series, and the plurality of first single-turn coils are arranged in at least one layer along the third direction; the first single-turn coil is in a figure with two straight edges extending along the second direction and arranged along the first direction; the first direction, the second direction and the third direction are perpendicular to each other. The technical scheme of the embodiment of the invention can reduce the influence of the coil skin effect, reduce the eddy current of the stator coil array, reduce the copper loss of the stator coil array, reduce the electromagnetic damping force of the stator coil array and improve the thrust density of the motor.

Description

Magnetic suspension motor and stator structure thereof

Technical Field

The invention relates to the technical field of motors, in particular to a magnetic suspension motor and a stator structure thereof.

Background

The magnetic suspension planar motor is a non-contact two-dimensional motion actuator which can realize accurate positioning in a larger stroke. A rotor secondary and a stator primary of the motor respectively adopt a magnet array and a coil array. After the coil is excited, the buoyancy in the vertical direction and the thrust in the horizontal direction can be provided for the rotor secondary. Because no additional mechanical supporting component and guide unit are adopted, the magnetic suspension planar motor can simultaneously realize translation and rotation in the stroke range. The stator coil array is a core component of the motor, and is required to have high electromagnetic thrust density, so that the high-speed operation of the magnetic suspension planar motor is realized.

The stator coil array of the existing moving magnet type magnetic suspension planar motor consists of single-stranded wires or copper bars, and the structure can ensure the fullness rate of stator slots; however, the permanent magnet moves in a magnetic field to cut the magnetic induction lines and is influenced by the skin effect, so that a single-stranded wire or a copper bar generates large eddy current and electromagnetic damping force, and the high-speed operation of the moving magnet type magnetic suspension planar motor is hindered.

Disclosure of Invention

The embodiment of the invention provides a magnetic suspension motor and a stator structure thereof, which can reduce the influence of coil skin effect, reduce the eddy current of a stator coil array, reduce the copper loss of the stator coil array, reduce the electromagnetic damping force of the stator coil array, improve the thrust density of the motor and further ensure the high-speed operation of a moving magnet type magnetic suspension planar motor.

In a first aspect, an embodiment of the present invention provides a stator structure of a magnetic levitation motor, including: a plurality of first multi-phase coil units;

the plurality of first multi-phase coil units are arranged along a first direction, and the total length occupied by any one first multi-phase coil unit in the first direction is equal to the pole pitch;

any one first multi-phase coil unit comprises a plurality of first single-phase coils which are arranged in a lap winding mode along a first direction;

any one first single-phase coil comprises a plurality of first single-turn coils which are connected in series, and the plurality of first single-turn coils are arranged in at least one layer along a third direction;

the first single-turn coil is in a figure with two straight edges extending along the second direction and arranged along the first direction; the first direction, the second direction and the third direction are perpendicular to each other.

Further, the stator structure of the magnetic levitation motor further comprises: a plurality of second multi-phase coil units;

wherein the plurality of second poly-phase coil units are arranged along a second direction, and the total length occupied by any second poly-phase coil unit in the second direction is equal to the pole pitch;

any one second multi-phase coil unit comprises a plurality of second single-phase coils which are arranged in a lap winding mode along the second direction;

any one second single-phase coil comprises a plurality of second single-turn coils which are connected in series, and the plurality of second single-turn coils are arranged in at least one layer along the third direction;

the second single-turn coil is in a pattern with two straight sides extending along the first direction and arranged along the second direction.

Furthermore, the stator structure of the magnetic suspension motor also comprises a first base and a second base which are arranged along the third direction, wherein the first base is provided with a plurality of first grooves which are arranged along the first direction and extend along the second direction, and different first single-phase coils are positioned in different first grooves; the second base is provided with a plurality of second grooves which are arranged along the second direction and extend along the first direction, and different second single-phase coils are positioned in different second grooves.

Furthermore, the stator structure of the magnetic suspension motor also comprises a printed circuit board, wherein the printed circuit board comprises a plurality of conductive layers and insulating layers which are alternately stacked and arranged along a third direction; the conductive layer is patterned to form a plurality of first poly-phase coil units and a plurality of second poly-phase coil units.

Further, the first and second poly-phase coil units are located on different conductive layers.

Furthermore, in any first single-phase coil, two straight edges of any first single-turn coil are positioned on the same conductive layer, and the first single-turn coils positioned on different conductive layers are electrically connected through a through hole penetrating through at least one insulating layer; in any second single-phase coil, two straight sides of any second single-turn coil are positioned on the same conductive layer, and the second single-turn coils positioned on different conductive layers are electrically connected through a through hole penetrating through at least one insulating layer.

Further, the first multi-phase coil unit is a flexible coil; the second multi-phase coil unit is a flexible coil.

Furthermore, the stator structure of the magnetic suspension motor also comprises a first current driving module and a second current driving module, wherein two ends of a plurality of first single-turn coils in any first single-phase coil after being connected in series are electrically connected with the first current driving module; and two ends of a plurality of second single-turn coils in any second single-phase coil after being connected in series are electrically connected with the second current driving module.

In a second aspect, an embodiment of the present invention further provides a magnetic levitation motor, including: the rotor structure and the stator structure of the magnetic suspension motor provided by any embodiment of the invention,

the rotor structure comprises at least one magnet array.

Further, the rotor structure is a one-dimensional halbach magnet array.

In the technical scheme of the embodiment of the invention, the stator structure of the magnetic suspension motor comprises: a plurality of first multi-phase coil units; the plurality of first multi-phase coil units are arranged along a first direction, and the total length occupied by any one first multi-phase coil unit in the first direction is equal to the pole pitch; any one first multi-phase coil unit comprises a plurality of first single-phase coils which are arranged in a lap winding mode along a first direction; any one first single-phase coil comprises a plurality of first single-turn coils which are connected in series, and the plurality of first single-turn coils are arranged in at least one layer along a third direction; the first single-turn coil is in a figure with two straight edges extending along the second direction and arranged along the first direction; the first direction, the second direction and the third direction are mutually perpendicular, so that the influence of the coil skin effect can be reduced, the eddy current of the stator coil array is reduced, the copper loss of the stator coil array is reduced, the electromagnetic damping force of the stator coil array is reduced, the thrust density of the motor is improved, and the high-speed operation of the moving magnet type magnetic suspension planar motor is further ensured.

Drawings

Fig. 1 is a schematic top view of a stator structure of a magnetic levitation motor according to an embodiment of the present invention;

FIG. 2 is a schematic cross-sectional view along AA' of FIG. 1;

fig. 3 is a schematic structural diagram of a first single-phase coil according to an embodiment of the present invention;

fig. 4 is a schematic top view of a stator structure of a magnetic levitation motor according to another embodiment of the present invention;

fig. 5 is a schematic cross-sectional view of a stator structure of a magnetic levitation motor according to an embodiment of the present invention, taken along direction AA' in fig. 4;

fig. 6 is a schematic structural diagram of a stator structure of a magnetic levitation motor according to another embodiment of the present invention;

fig. 7 is a schematic structural diagram of a second single-phase coil according to an embodiment of the present invention;

fig. 8 is a schematic structural diagram of a first base according to an embodiment of the present invention;

fig. 9 is a schematic structural diagram of a second base according to an embodiment of the present invention;

fig. 10 is a schematic cross-sectional view of a stator structure of a magnetic levitation motor according to another embodiment of the present invention;

fig. 11 is a schematic cross-sectional view illustrating a stator structure of a magnetic levitation motor according to another embodiment of the present invention;

fig. 12 is a schematic structural diagram of a magnetic levitation motor according to an embodiment of the present invention;

fig. 13 is a schematic view of a partial cross-sectional structure along the direction BB' in fig. 12.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.

The embodiment of the invention provides a stator structure of a magnetic suspension motor. Fig. 1 is a schematic top view of a stator structure of a magnetic levitation motor according to an embodiment of the present invention. FIG. 2 is a schematic cross-sectional view along AA' of FIG. 1. Fig. 3 is a schematic structural diagram of a first single-phase coil according to an embodiment of the present invention. As shown in fig. 1 to 3, the stator structure 2 of the magnetic levitation motor includes: a plurality of first polyphase coil units 10.

Wherein a plurality of first poly-phase coil units 10 are arranged along a first direction x, and the total length occupied by any one of the first poly-phase coil units in the first direction x is equal to a pole pitch λ; any one of the first multiphase coil units 10 includes a plurality of first single-phase coils 11, and the plurality of first single-phase coils 11 are arranged in a lap winding manner along the first direction x; any one of the first single-phase coils 11 includes a plurality of first single-turn coils 111, the plurality of first single-turn coils 111 are connected in series, and the plurality of first single-turn coils 111 are arranged in at least one layer along the third direction z; the first single-turn coil 111 is in a pattern with two straight sides 1111 extending along the second direction y and arranged along the first direction x; the first direction x, the second direction y and the third direction z are perpendicular to each other.

All the first multi-phase coil units 10 have the same number of phases. The number of phases of the first multi-phase coil unit 10 may be three, four, six, etc., and may be set according to needs, which is not limited in the embodiment of the present invention. The number of the first multi-phase coil units 10 may be set according to the stroke size, which is not limited in the embodiment of the present invention. Fig. 1 and 2 exemplarily show a case where the number of phases of the first multi-phase coil unit 10 is three. Fig. 2 exemplarily shows a case where the first single-phase coil 11 includes 6 first single-turn coils 111 arranged in six layers in the third direction z, each layer having one first single-turn coil 111. Fig. 3 exemplarily shows a case where the first single-phase coil 11 includes three first single-turn coils 111 arranged in three layers in the third direction z, each layer having one first single-turn coil 111. The first direction may be direction x or direction y. The second direction may be direction x or direction y. Fig. 1 exemplarily shows a case where the first direction is a direction x and the second direction is a direction y. The first single turn coil 111 may be flat. The plurality of first poly-phase coil units 10 do not overlap in the first direction x. The two straight sides 1111 of any first single turn coil 111 occupy a layer in the third direction z, the thickness of one layer being equal to the thickness of the cross section of the first single turn coil 111 in the third direction z. Any one of the first single-phase coils 11 may have one or more first single-turn coils 111 per layer, and the number of the first single-turn coils 111 per layer may be equal. In any of the first single-phase coils 11, the plurality of first single-turn coils 111 located in the same layer may be formed in a spiral coil shape, or the plurality of first single-turn coils 111 located in the same layer may be arranged in a lap-wound manner. The plurality of first single-phase coils 11 in any one of the first multi-phase coil units 10 are arranged in a winding manner at equal intervals along the first direction x. The first single-phase coil 11 may be a multi-turn continuous coil. After the coil array of the stator structure is excited, the vertical buoyancy and the horizontal thrust can be provided for the magnet array of the rotor structure, so that the magnet array of the rotor structure can move.

Compared with the mode that the conducting wire with the larger cross section is wound into the single-turn coil, the influence of the coil skin effect can be reduced, the eddy current of the stator coil array is reduced, the copper loss of the stator coil array is reduced, the electromagnetic damping force of the stator coil array is reduced, and the stator slot filling rate can be ensured. First single-phase coil 11 can be wound into a plurality of first single-turn coils 111 connected in series through a lead wire with a small cross section, and compared with a mode that a plurality of single-turn coils are connected in parallel, a large thrust can be obtained only by inputting a small current to the first single-phase coil, so that the thrust density of the motor is improved, and high-speed operation of the moving magnet type magnetic suspension planar motor is further ensured.

In the technical solution of this embodiment, the stator structure of the magnetic levitation motor includes: a plurality of first multi-phase coil units; the plurality of first multi-phase coil units are arranged along a first direction, and the total length occupied by any one first multi-phase coil unit in the first direction is equal to the pole pitch; any one first multi-phase coil unit comprises a plurality of first single-phase coils which are arranged in a lap winding mode along a first direction; any one first single-phase coil comprises a plurality of first single-turn coils which are connected in series, and the plurality of first single-turn coils are arranged in at least one layer along a third direction; the first single-turn coil is in a figure with two straight edges extending along the second direction and arranged along the first direction; the first direction, the second direction and the third direction are mutually perpendicular, so that the influence of the coil skin effect can be reduced, the eddy current of the stator coil array is reduced, the copper loss of the stator coil array is reduced, the electromagnetic damping force of the stator coil array is reduced, the thrust density of the motor is improved, and the high-speed operation of the moving magnet type magnetic suspension planar motor is further ensured.

Fig. 4 is a schematic top view of a stator structure of a magnetic levitation motor according to another embodiment of the present invention. Fig. 5 is a schematic cross-sectional view of a stator structure of a magnetic levitation motor according to an embodiment of the present invention, taken along the direction AA' in fig. 4. Fig. 4 and 5 exemplarily show the case where the number of phases of the first multi-phase coil unit 10 is four. Fig. 4 exemplarily shows a case where the first single-phase coil 11 includes 2 first single-turn coils 111 arranged in layers each having 2 first single-turn coils 111 in the third direction z. Fig. 5 exemplarily shows a case where the first single-phase coil 11 includes 12 first single-turn coils 111 arranged in six layers in the third direction z, each layer having 2 first single-turn coils 111. The number of layers of the first single-phase coil 11 and the number of the first single-turn coils 111 in each layer may be set as required, which is not limited in the embodiment of the present invention. Fig. 4 exemplarily shows a case where a plurality of first single-turn coils 111 located in the same layer are arranged one on another in any of the first single-phase coils 11. Note that the top view of each layer structure corresponding to fig. 5 is the same as or similar to the structure of fig. 4.

The embodiment of the invention provides a stator structure of a magnetic suspension motor. Fig. 6 is a schematic structural diagram of a stator structure of another magnetic levitation motor according to an embodiment of the present invention. Fig. 7 is a schematic structural diagram of a second single-phase coil according to an embodiment of the present invention. On the basis of the above-mentioned embodiment, the stator structure 2 of the magnetic levitation motor further includes: a plurality of second poly-phase coil units 20.

Wherein the plurality of second poly-phase coil units 20 are arranged along the second direction y, and a total length occupied by any one of the second poly-phase coil units 20 in the second direction y is equal to the pole pitch λ; any one of the second multi-phase coil units 20 includes a plurality of second single-phase coils 21, which are arranged to be wound one upon another in the second direction y; any one of the second single-phase coils 21 includes a plurality of second single-turn coils 211, the plurality of second single-turn coils 211 are connected in series, and the plurality of second single-turn coils 211 are arranged in at least one layer along the third direction z; the second single-turn coil 211 has a pattern with two straight sides 2111 extending in the first direction x and arranged in the second direction y.

Wherein the number of phases of all the second multi-phase coil units 20 is the same. The number of phases of the second multi-phase coil unit 20 is the same as the number of phases of the first multi-phase coil unit 10. The number of the second multi-phase coil units 20 may be set according to the stroke size, which is not limited in the embodiment of the present invention. Fig. 6 exemplarily shows a case where the number of phases of the second multi-phase coil unit 20 is four. Fig. 7 exemplarily shows a case where the second single-phase coil 21 is two second single-turn coils 211 arranged in two layers in the third direction z, each layer having one second single-turn coil 211. The plurality of second poly-phase coil units 20 do not overlap in the second direction y. The two straight sides 2111 of any second single turn coil 211 may occupy a layer in the third direction z, the thickness of one layer being equal to the thickness of the cross-section of the second single turn coil 211 in the third direction z. Any one of the second single-phase coils 21 may have one or more second single-turn coils 211 per layer, and the number of second single-turn coils 211 per layer may be equal. The plurality of second single-turn coils 211 located at the same layer in any one of the second single-phase coils 21 may be formed in a spiral coil shape, or the plurality of second single-turn coils 211 located at the same layer may be arranged to be wound one on another. The plurality of second single-phase coils of any one of the second multi-phase coil units 20 are arranged in the second direction y with equal intervals. The second single-phase coil 21 may be a multi-turn continuous coil.

The second single-phase coil 21 can be wound into a plurality of second single-turn coils 211 connected in series through the conducting wire with the smaller cross section, and compared with a mode that the conducting wire with the larger cross section is wound into the single-turn coil, the influence of the coil skin effect can be reduced, the eddy current of the stator coil array is reduced, the copper loss of the stator coil array is reduced, the electromagnetic damping force of the stator coil array is reduced, and the stator slot filling rate can be ensured. The second single-phase coil 21 can be wound into a plurality of second single-turn coils 211 which are connected in series through a lead wire with a small cross section, and compared with a mode that a plurality of single-turn coils are connected in parallel, the second single-phase coil only needs to input small current, so that large thrust can be obtained, the thrust density of the motor is improved, and high-speed operation of the moving magnet type magnetic suspension planar motor is further ensured.

The embodiment of the invention provides a stator structure of a magnetic suspension motor. Fig. 8 is a schematic structural diagram of a first base according to an embodiment of the present invention. On the basis of the above embodiment, the stator structure of the magnetic levitation motor further includes a first base 30, wherein the first base 30 is provided with a plurality of first grooves 31 arranged along the first direction x and extending along the second direction y, and different first single-phase coils 11 are located in different first grooves 31.

Here, each of the first single-phase coils 11 may be sequentially wound on the first base 30 to fix the coil array on the first base 30. In any of the first single-phase coils 11, different first single-turn coils 111 located in the same layer may be located in different first grooves 31. For example, referring to fig. 2, 3 and 8, taking the number of phases of the first multi-phase coil unit 10 as three phases as an example, a conducting wire such as an enameled wire or a copper wire may pass through the first groove 31-1 and then enter the fourth first groove 31-4, which is each first single-turn coil, and then enter the first groove 31-1, then enter the fourth first groove 31-4, then enter the first groove 31-1, and then enter the fourth first groove 31-4, so as to form a first single-phase coil including three first single-turn coils. The second first groove 31-2 and the fifth first groove 31-5 are used to wind another first single-phase coil, and the third first groove 31-3 and the sixth first groove 31-6 are used to wind another first single-phase coil, so that the first groove 31-1 to the first groove 31-6 correspond to one first multi-phase coil unit 10 having three phases. The cross-sectional area of the wire may be circular or rectangular, etc. A gap exists between two adjacent first single-turn coils in the first single-phase coil 11 in the third direction Z to improve the heat dissipation capability. At least one side wall of the first groove can be provided with a plurality of first protruding parts at intervals so as to conveniently fix the preset gap between every two adjacent first single-turn coils. The current carrying capacity of the coil can be increased by changing the thickness of the first single-turn coil or adopting a thick wire method, so that the operation of the moving magnet type magnetic suspension planar motor under large current is realized.

Optionally, on the basis of the above embodiment, fig. 9 is a schematic structural diagram of a second base according to an embodiment of the present invention, the stator structure of the magnetic levitation motor further includes a second base 40, the second base is provided with a plurality of second grooves 41 arranged along the second direction y and extending along the first direction x, and different second single-phase coils 21 are located in different second grooves 41.

Wherein, the second base 40 and the first base 30 can have the same or similar structure. Alternatively, the first and

second bases

30 and 40 may be arranged in line in the third direction z. Each of the second single-phase coils 21 may be sequentially wound on the second base 40 to fix the coil array on the second base 40. In any of the second single-phase coils 21, a different second single-turn coil 211 located in the same layer may be located in a different second groove 41.

For example, as shown in fig. 6, 7 and 9, taking the number of phases of the second multi-phase coil unit 20 as four phases as an example, the conducting wires such as enameled wires and copper wires may pass through the first second groove 41-1 and then enter the fifth groove 41-5, which is a second single-turn coil, and then enter the first second groove 41-1 and then enter the fifth groove 41-5, so as to form the second single-phase coil 21 including two second single-turn coils. The second groove 41-2 and the sixth second groove 41-6 are used to wind yet another second single-phase coil, the third second groove 41-3 and the seventh second groove 41-7 are used to wind yet another second single-phase coil, and the fourth second groove 41-4 and the eighth second groove 41-8 are used to wind yet another second single-phase coil, so that the second groove 41-1 to the second groove 41-8 correspond to one second multi-phase coil unit 20 having four phases. A gap exists between the second single-turn coils 211 of adjacent layers in the second single-phase coil 21 in the third direction Z to improve heat dissipation capability. At least one side wall of the second groove is provided with a plurality of second protruding parts at intervals so as to conveniently fix the second single-turn coils of each adjacent layer to form a preset gap. The current carrying capacity of the coil can be increased by changing the thickness of the second single-turn coil or adopting a thick wire method, so that the operation of the moving magnet type magnetic suspension planar motor under large current is realized.

It should be noted that, each first multi-phase coil unit 10 may be sequentially wound on the first base 30, each second multi-phase coil unit 20 may be sequentially wound on the second base 40, and then the first base 30 and the second base 40 may be arranged along the third direction z to complete the assembly of the entire stator structure.

Alternatively, the first multi-phase coil unit 10 is a flexible coil, which is conveniently wound on the first base 30. Each turn of coil of the first single-phase coil is of a flat, thin and soft structure and is tightly connected, so that the single-phase coil has the advantages of simple structure and convenience in installation, and the energy consumption and cost of the motor are reduced. Alternatively, the second multi-phase coil unit 20 is a flexible coil, which is conveniently wound on the second base 40. Each turn of the second single-phase coil is of a flat, thin and soft structure and is tightly connected, so that the motor has the advantages of simple structure and convenience in installation, and the energy consumption and the cost of the motor are reduced.

The embodiment of the invention provides a stator structure of a magnetic suspension motor. Fig. 10 is a schematic cross-sectional view of a stator structure of a magnetic levitation motor according to another embodiment of the present invention. Fig. 11 is a schematic cross-sectional structure view of a stator structure of a magnetic levitation motor according to another embodiment of the present invention. On the basis of the above embodiment, the stator structure of the magnetic levitation motor further includes a printed circuit board, and the printed circuit board may include a plurality of conductive layers 51 and insulating layers 52 alternately stacked and arranged along the third direction z; the conductive layer 51 is patterned to form a plurality of first and second poly-

phase coil units

10 and 20.

The larger the number of layers of first single-phase coil 11, the larger the number of layers of second single-phase coil 21, and the larger the number of conductive layers 51. FIG. 10 is a schematic view of a cross-section along the AA' direction in FIG. 6. Fig. 11 is a schematic cross-sectional view along the direction CC' in fig. 6. Fig. 10 and 11 exemplarily show that the number of phases of the first multi-phase coil unit 10 is four, and the first single-phase coil 11 includes three first single-turn coils arranged in three layers in the third direction z, each layer having one first single-turn coil 111; the number of phases of the second multi-phase coil unit 20 is four, and the second single-phase coil 21 includes three second single-turn coils arranged in three layers in the third direction z, each layer having one second single-turn coil 211. The two straight sides 1111 of the first single-turn coil 111 located at different layers in any one of the first single-phase coils 11 are formed in different conductive layers 51. The two straight sides 2111 of the second single-turn coil 211 located in different layers in any of the second single-phase coils 21 are formed in different conductive layers 51.

Alternatively, the first and second

polyphase coil units

10, 20 are located on different conductive layers 51. Fig. 10 and 11 exemplarily show that a plurality of first multiphase coil units 10 (i.e., Y-coil arrays) are formed on the lower three-layered conductive layer 51, and a plurality of second multiphase coil units 20 (i.e., X-coil arrays) are formed on the upper three-layered conductive layer 51.

Optionally, in any first single-phase coil 11, two straight edges of any first single-turn coil 111 are located on the same conductive layer 51, and the first single-turn coils 111 located on different conductive layers are electrically connected through a via penetrating through at least one insulating layer 52, so as to implement series connection of multiple first single-turn coils, thereby forming the first single-phase coil 11.

Optionally, in any second single-phase coil 21, two straight edges of any second single-turn coil 211 are located on the same conductive layer 51, and second single-turn coils 211 located on different conductive layers are electrically connected through a via penetrating through at least one insulating layer 52, so as to implement series connection of multiple second single-turn coils, thereby forming the second single-phase coil 21.

Optionally, on the basis of the above embodiment, fig. 12 is a schematic structural diagram of a magnetic levitation motor according to an embodiment of the present invention, and as described in conjunction with fig. 3, fig. 7, and fig. 12, the stator structure of the magnetic levitation motor further includes a first current driving module 60 and a second current driving module 70, where two ends of each of the first single-phase coils 11 after the first single-turn coils 111 are connected in series are electrically connected to the first current driving module 60; both ends of the plurality of second single-turn coils 211 in any one of the second single-phase coils 21 after being connected in series are electrically connected to the second current driving module 70.

The first multiphase current driving module 60 may input symmetrical multiphase currents to the first multiphase coil unit. The second current driving module 70 may input symmetrical multi-phase currents to the second multi-phase coil unit. The first multiphase current drive module 60 may include a control circuit and a bridge switch circuit. The second current driving module 70 may include a control circuit and a bridge switching circuit. The bridge switching circuit may include a plurality of switching tubes, and the switching tubes may include at least one of: a MOSFET (Metal-Oxide-Semiconductor Field-Effect Transistor), an IGBT (Insulated Gate Bipolar Transistor), and the like.

The embodiment of the invention provides a magnetic suspension motor. On the basis of the above-described embodiment, with continued reference to fig. 12, the magnetic levitation motor includes: the rotor structure 1 and the stator structure of the magnetic suspension motor provided by any embodiment of the invention.

Wherein the mover structure 1 comprises at least one magnet array. Alternatively, based on the above embodiment, with continuing reference to fig. 10, the mover structure 1 is a one-dimensional halbach magnet array, and may include 4 magnet arrays, specifically, Y1 array, X2 array, Y3 array, and X4 array. Fig. 13 can be a schematic partial cross-sectional structure along the direction BB' in fig. 12. (F)_x1，F_z1)、(F_y2，F_z2)、(F_x3，F_z3) And (F)_y4，F_z4) Thrust and levitation forces experienced by the Y1 array, the X2 array, the Y3 array, and the X4 array, respectively. Fig. 13 exemplarily shows that the number of phases of the second multi-phase coil unit 20 is four, and the second single-phase coil unit includes four turns of a second single-turn coil, including a phase, B phase, C phase and D phase, respectively, wherein the current directions of two straight sides (e.g., a + and a-) of the second single-turn coil extending in the second direction and arranged in the first direction are opposite, and the sign "+" may indicate that the current direction is inward, and the sign "-" may indicate that the current direction is outward. In the second multiphase coil unit 20, a + and a-located in the same layer correspond to a second single-turn coil, B + and B-located in the same layer correspond to a second single-turn coil, C + and C-located in the same layer correspond to a second single-turn coil, and D + and D-located in the same layer correspond to a second single-turn coil. The pole pitch λ is equal to the length occupied by the magnetic period of the magnet array.

The magnetic suspension motor provided by the embodiment of the present invention includes the stator structure in the above embodiment, so the magnetic suspension motor provided by the embodiment of the present invention also has the beneficial effects described in the above embodiment, and details are not described herein again.

It is to be noted that the foregoing is only illustrative of the preferred embodiments of the present invention and the technical principles employed. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious modifications, rearrangements, combinations and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.

Claims

1. A stator structure of a magnetic levitation motor, comprising: a plurality of first multi-phase coil units;

wherein the plurality of first poly-phase coil units are arranged along a first direction, and the total length occupied by any one of the first poly-phase coil units in the first direction is equal to a pole pitch;

any one of the first multi-phase coil units includes a plurality of first single-phase coils that are arranged to be wound in the first direction;

any one of the first single-phase coils comprises a plurality of first single-turn coils which are connected in series, and the plurality of first single-turn coils are arranged in at least one layer along a third direction;

the first single-turn coil is in a figure with two straight edges extending along a second direction and arranged along the first direction; the first direction, the second direction and the third direction are perpendicular to each other;

the stator structure of the magnetic suspension motor further comprises a first current driving module; and two ends of a plurality of first single-turn coils in any first single-phase coil after being connected in series are electrically connected with the first current driving module.

2. The stator structure of a magnetic levitation motor as recited in claim 1, further comprising: a plurality of second multi-phase coil units;

wherein the plurality of second poly-phase coil units are arranged along a second direction, and a total length occupied by any one of the second poly-phase coil units in the second direction is equal to a pole pitch;

any one of the second multi-phase coil units includes a plurality of second single-phase coils that are arranged to be wound in the second direction;

any one of the second single-phase coils comprises a plurality of second single-turn coils which are connected in series, and the plurality of second single-turn coils are arranged in at least one layer along a third direction;

3. The stator structure of a magnetic levitation motor as recited in claim 2, further comprising a first base and a second base arranged in the third direction, wherein the first base is provided with a plurality of first grooves arranged in the first direction and extending in the second direction, and different first single-phase coils are located in different first grooves; the second base is provided with a plurality of second grooves which are arranged along the second direction and extend along the first direction, and different second single-phase coils are positioned in different second grooves.

4. The stator structure of a magnetic levitation motor as recited in claim 2, further comprising a printed circuit board comprising a plurality of layers of conductive and insulating layers alternately stacked and arranged in the third direction; the conductive layer is patterned to form the plurality of first poly-phase coil units and the plurality of second poly-phase coil units.

5. The stator structure of a magnetic levitation motor as recited in claim 4, wherein the first and second poly-phase coil units are located on different conductive layers.

6. The stator structure of a magnetic levitation motor as recited in claim 4, wherein in any one of the first single-phase coils, two straight sides of any one of the first single-turn coils are located on the same conductive layer, and the first single-turn coils located on different conductive layers are electrically connected through a via penetrating through at least one insulating layer; in any one of the second single-phase coils, two straight sides of any one of the second single-turn coils are positioned on the same conductive layer, and the second single-turn coils positioned on different conductive layers are electrically connected through a through hole penetrating through at least one layer of the insulating layer.

7. The stator structure of a magnetic levitation motor as recited in claim 3, wherein the first multi-phase coil unit is a flexible coil; the second multi-phase coil unit is a flexible coil.

8. The stator structure of a magnetic levitation motor as recited in claim 2, further comprising a second current driving module, wherein both ends of the plurality of second single-turn coils of any one of the second single-phase coils connected in series are electrically connected to the second current driving module.

9. A magnetically levitated motor, comprising: mover structure and stator structure of a magnetic levitation motor as claimed in any of claims 1-8,

wherein the mover structure includes at least one magnet array.

10. The magnetic levitation motor as recited in claim 9, wherein the mover structure is a one-dimensional halbach magnet array.