Modular three-stator bearingless stator permanent magnet motor structure

Abstract

The utility model relates to a permanent magnet motor, in particular to a modularized three-stator bearingless stator permanent magnet motor structure. According to the motor, torque magnetic flux and suspension force magnetic flux are separated in space, the decoupling degree can be improved, and then the control difficulty is reduced. Comprising a stator assembly, a rotor assembly and a casing assembly. The stator assembly comprises a C-shaped stator, a C-shaped suspension stator assembly and a yoke-free stator assembly. The C-shaped stator and C-shaped suspension stator assembly comprises a plurality of C-shaped stator components, C-shaped suspension stator components and a C-shaped stator frame, and the C-shaped stator components and the C-shaped suspension stator components are evenly distributed along the circumferential inner wall of the C-shaped stator frame and connected together through the C-shaped stator frame. The yoke-free stator assembly comprises a yoke-free stator frame and a plurality of yoke-free stator components, and the plurality of yoke-free stator components are distributed at equal intervals along the circumferential inner wall of the yoke-free stator frame and are connected together through the yoke-free stator frame. And the yoke-free stator assembly is positioned inside the C-shaped stator and the C-shaped suspension stator assembly.

Description

Technical Field

[0001] The utility model relates to a permanent magnet motor, in particular to a modular three-stator bearingless stator permanent magnet motor structure. Background Art

[0002] In a traditional electric drive system, the rotor of a motor is usually supported by two mechanical bearings. Therefore, mechanical friction will be generated during the movement of the rotor. This mechanical friction not only increases the frictional resistance of the rotor, causes bearing wear, and shortens the bearing life, but also causes mechanical vibration and noise, affecting the stability of the system and the working environment. In addition, mechanical friction will also cause components to heat up, deteriorate the performance of lubricants, and further exacerbate the wear and aging of bearings. In severe cases, this will lead to uneven air gaps in the motor, winding heating, and temperature rise, thereby reducing the efficiency of the motor, increasing energy consumption, and shortening its service life. These problems not only increase the maintenance cost, but also may affect the reliability and safety of the entire system. Summary of the Invention

[0003] The utility model aims at the defects existing in the prior art and provides a modular three-stator bearingless stator permanent magnet motor structure.

[0004] To achieve the above object, the utility model adopts the following technical solutions, including:

[0005] A stator assembly, which includes a C-shaped stator, a C-shaped suspension stator assembly, and a yoke-less stator assembly.

[0006] A rotor assembly.

[0007] A housing assembly.

[0008] Among them, the C-shaped stator and the C-shaped suspension stator assembly include a plurality of C-shaped stator components, C-shaped suspension stator components, and a C-shaped stator frame. Among them, the number of C-shaped stator components is at least 3, that is, m or an integer multiple of m (m is an integer of 3 or more), and the number of C-shaped suspension stator components is at least 4, that is, 4 or an integer multiple of 4; the C-shaped stator components and the C-shaped suspension stator components are evenly distributed along the inner circumference of the C-shaped stator frame and are connected together through the C-shaped stator frame to form a first annular structure.

[0009] The yoke-less stator assembly includes a yoke-less stator frame and a plurality of yoke-less stator components. Among them, the number of yoke-less stator components is equal to the number of C-shaped stator components; the plurality of yoke-less stator components are equidistantly distributed along the inner circumference of the yoke-less stator frame and are connected together through the yoke-less stator frame to form a second annular structure.

[0010] The yoke-less stator assembly is located inside the C-shaped stator and the C-shaped suspension stator assembly, and their geometric centers coincide; a stator assembly is formed.

[0011] Furthermore, the C-shaped stator component includes:

[0012] C-shaped stator core: made of soft magnetic material.

[0013] C-shaped stator permanent magnet: embedded in the axial center position of the C-shaped stator core, and the two are closely attached; the C-shaped stator permanent magnet adopts axial magnetization method.

[0014] C-shaped stator winding: wound with enameled wire, wound around the C-shaped stator core, and isolated from the C-shaped stator core with insulating paper to ensure electrical insulation.

[0015] Furthermore, the C-shaped floating stator component includes:

[0016] C-shaped floating stator core: made of soft magnetic material.

[0017] C-shaped floating stator winding: wound with enameled wire, wound outside the C-shaped floating stator core, and isolated from the C-shaped floating stator core with insulating paper.

[0018] Furthermore, the yoke-less stator component includes:

[0019] Yoke-less stator core: made of soft magnetic material.

[0020] Yoke-less stator permanent magnet: embedded in the axial center of the yoke-less stator core, and the two are closely attached.

[0021] Yoke-less stator winding: wound with enameled wire, wound outside the yoke-less stator core, and isolated from the yoke-less stator core with insulating paper.

[0022] Furthermore, the C-shaped stator frame is made of non-magnetic material, and is used to support and fix the C-shaped stator component and the C-shaped floating stator component; during assembly, 8 C-shaped stator components and 8 C-shaped floating stator components are evenly distributed along the circumference and connected together through the C-shaped stator frame to form an annular structure, ensuring the symmetry and stability of the structure.

[0023] Furthermore, the number of yoke-less stator components is equal to the number of C-shaped stator components. Radially, the C-shaped stator components and the yoke-less stator components are alternately and equally angularly distributed along the circumference (i.e., their positions are staggered) and assembled into a stator assembly.

[0024] Furthermore, the yoke-less stator frame is processed from non-magnetic material.

[0025] Furthermore, the rotor assembly is located inside the stator assembly and maintains a certain air gap with the stator assembly to facilitate the rotational movement of the rotor.

[0026] Furthermore, the rotor assembly includes a C-shaped rotor core, a C-shaped rotor frame, and a rotating shaft. The C-shaped rotor core and the C-shaped rotor frame are fixed by the rotating shaft to form the rotating part of the motor.

[0027] Furthermore, the housing assembly is used to protect and fix the entire motor structure. The housing assembly includes an end cover, a housing, a base, and a junction box. Among them, the housing, the base, and the junction box are integrally cast. The housing is provided with a spigot and a screw interface to fix the end cover.

[0028] The beneficial effects of the present invention compared with the prior art.

[0029] Both the stator and the rotor of the present invention adopt modularization, which is simple to manufacture and convenient to assemble, reducing the weight and manufacturing cost of the motor.

[0030] The present invention eliminates the motor bearings and has a series of advantages such as no contact, no wear, and maintenance-free.

[0031] The motor of the present invention separates the torque magnetic flux and the suspension force magnetic flux in space, which can improve the decoupling degree and thus reduce the control difficulty.

[0032] The motor of the present invention eliminates the winding ends, which can reduce the copper consumption and copper loss of the motor and improve the operating efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] The following further describes the present invention in conjunction with the drawings and specific embodiments. The protection scope of the present invention is not limited to the description of the following content.

[0034] Figure 1 It is the overall structure diagram of the motor of the present invention.

[0035] Figure 2 It is the disassembled diagram of the overall structure of the motor of the present invention.

[0036] Figure 3 It is the overall structure diagram of the stator assembly of the motor of the present invention.

[0037] Figure 4 It is the overall structure diagram of the yoke-free stator assembly of the motor of the present invention.

[0038] Figure 5 It is the overall structure diagram of the C-shaped stator and the C-shaped suspension stator assembly of the motor of the present invention.

[0039] Figure 6 It is the disassembled diagram of the overall structure of the stator assembly of the motor of the present invention.

[0040] Figure 7 It is the structure diagram of a single C-shaped stator component of the motor of the present invention.

[0041] Figure 8It is a structural diagram of a single C-type suspended stator component of the motor of the present utility model.

[0042] Figure 9 It is a structural diagram of a single yokeless stator component of the motor of the present utility model.

[0043] Figure 10 It is a structural diagram of a single C-type stator core of the motor of the present utility model.

[0044] Figure 11 It is a structural diagram of a single C-type suspended stator core of the motor of the present utility model.

[0045] Figure 12 It is a structural diagram of a single yokeless stator core of the motor of the present utility model.

[0046] Figure 13 It is a structural diagram of the motor winding of the present utility model.

[0047] Figure 14 It is a structural diagram of the permanent magnet of the motor of the present utility model.

[0048] Figure 15 It is a structural diagram of the overall rotor assembly of the motor of the present utility model.

[0049] Figure 16 It is an exploded view of the overall structure of the rotor assembly of the motor of the present utility model.

[0050] Figure 17 It is a structural diagram of a single rotor of the motor of the present utility model.

[0051] In the figure, 1. C-type stator core, 2. C-type stator winding, 3. C-type stator permanent magnet, 4. C-type suspended stator core, 5. C-type suspended stator winding, 6. C-type stator frame, 7. yokeless stator core, 8. yokeless stator winding, 9. yokeless stator permanent magnet, 10. yokeless stator frame, 11 and 12 are air gaps, 13. C-type rotor core, 14. C-type rotor frame, 15. rotating shaft, 16. end cover, 17. housing, 18. base, 19. junction box. Specific embodiments

[0052] To make the objectives, technical solutions, and beneficial effects of the embodiments of the present utility model clearer, the following will clearly and completely describe the technical solutions in the embodiments of the present utility model with reference to the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are some, but not all, of the embodiments of the present utility model.

[0053] Based on the modular three-stator bearingless stator permanent magnet motor of the present utility model, the following content will be described with the number of phases m being 4. In this embodiment, the axial direction is the direction of the center line of the motor rotating shaft, and the radial direction is the straight line direction along the diameter, that is, the straight line direction perpendicular to the axial direction.

[0054] As Figure 1-17 shown, the structure of the modular three-stator bearingless stator permanent magnet motor includes the modular three-stator bearingless stator permanent magnet motor body; the modular three-stator bearingless stator permanent magnet motor body includes a stator assembly, a rotor assembly, and a housing assembly.

[0055] The stator assembly includes a C-shaped stator and a C-shaped suspension stator assembly, and a yoke-less stator assembly. Among them, the C-shaped stator and the C-shaped suspension stator assembly include a C-shaped stator core 1, a C-shaped stator winding 2, a C-shaped stator permanent magnet 3, a C-shaped suspension stator core 4, a C-shaped suspension stator winding 5, and a C-shaped stator frame 6; the yoke-less stator assembly includes a yoke-less stator core 7, a yoke-less stator winding 8, a yoke-less stator permanent magnet 9, and a yoke-less stator frame 10.

[0056] In Embodiment 1, the C-shaped stator core 1, the C-shaped suspension stator core 4, and the yoke-less stator core 7 are made of soft magnetic materials, and their upper arcs are processed by mechanical machining. The C-shaped stator winding 2, the C-shaped suspension stator winding 5, and the yoke-less stator winding 8 are wound with enameled wires. The C-shaped stator frame 6 and the yoke-less stator frame 10 are processed with non-magnetic materials.

[0057] The C-shaped stator permanent magnet 3 is placed in the center of the C-shaped stator core 1 in the axial direction, and the yoke-less stator permanent magnet 9 is placed in the center of the yoke-less stator core 7 in the axial direction and is closely attached to the permanent magnet. The C-shaped stator permanent magnet 3 and the yoke-less stator permanent magnet 9 adopt the axial magnetization method.

[0058] In Embodiment 2, insulating paper and the C-shaped stator winding 2 are wound around the C-shaped stator core 1 and the C-shaped stator permanent magnet 3, with the insulating paper inside and the C-shaped stator winding 2 outside. This is a single C-shaped stator component. Similarly, insulating paper and the C-shaped suspension stator winding 5 are wound around the C-shaped suspension stator core 4, with the insulating paper inside and the C-shaped suspension stator winding 5 outside. This is a single C-shaped suspension stator component. Eight C-shaped stator components and eight C-shaped suspension stator components are assembled with the C-shaped stator frame 6 to form the C-shaped stator and the C-shaped suspension stator assembly.

[0059] In Embodiment 3, insulating paper and the yoke-less stator winding 8 are wound around the yoke-less stator core 7 and the permanent magnet 9, with the insulating paper inside and the yoke-less stator winding 8 outside. This is a single yoke-less stator component. The same number of yoke-less stator components are assembled with the yoke-less stator frame 10 to form the yoke-less stator assembly. The geometric centers of the C-shaped stator and the C-shaped suspension stator assembly and the yoke-less stator assembly coincide, and the C-shaped suspension stator components and the yoke-less stator components are assembled along the same circumferential angle in the radial direction to form the stator assembly.

[0060] Embodiment 4. The rotor assembly includes a C-shaped rotor core 13, a C-shaped rotor frame 14, and a rotating shaft 15. The C-shaped rotor core 13 is made of soft magnetic material, and its upper arc is machined by mechanical processing. The C-shaped rotor frame 14 can be processed with non-magnetic conductive material. The rotating shaft 15 is also made of non-magnetic conductive material. In order to prevent the C-shaped rotor 13 from detaching from the C-shaped rotor frame 14 during high-speed operation of the motor, necessary protection measures need to be taken on the rotor. The C-shaped stator and the C-shaped suspended stator assembly cooperate with the C-shaped rotor assembly to form an air gap 11, and the yoke-less stator assembly and the C-shaped rotor assembly cooperate to form an air gap 12.

[0061] Embodiment 5. The rotor assembly includes a C-shaped rotor core 13, a C-shaped rotor frame 14, and a rotating shaft 15. The C-shaped rotor core 13 is made of soft magnetic material, and its upper arc is machined by mechanical processing. The C-shaped rotor frame 14 can be processed with non-magnetic conductive material. The rotating shaft 15 is also made of non-magnetic conductive material. In order to prevent the C-shaped rotor core 13 from detaching from the C-shaped rotor frame 14 during high-speed operation of the motor, necessary protection measures need to be taken on the rotor. The C-shaped rotor core 13 and the C-shaped rotor frame 14 are fixed by the rotating shaft to form the rotating part of the motor.

[0062] Embodiment 6. The motor housing assembly includes end covers 16, a housing 17, a machine base 18, and a junction box 19. Among them, the housing 17, the machine base 18, and the junction box 19 are integrally cast. The housing 17 is provided with a spigot and screw interfaces to fix the end covers 16. There are two motor end covers 16 in total, both of which are provided with spigots and are fixed on both sides of the housing 17 through the spigots and screws.

[0063] The outgoing ends of the C-shaped stator winding 2, the C-shaped suspended stator winding 5, and the yoke-less stator winding 8 are led out through the stator frames 6 and 10 and gathered in the junction box 19. When leading the windings to the junction box 19, necessary winding protection and insulation measures need to be taken to prevent winding damage and leakage.

[0064] Both the stator and rotor of the modular three-stator bearingless permanent magnet motor of the present utility model adopt modularization, which is simple to manufacture and convenient to assemble, reducing the manufacturing cost of the motor; the present utility model eliminates the motor bearings, and it has advantages such as no wear, maintenance-free, and no need for lubrication that ordinary motors do not have; at the same time, the C-shaped stator components and the yoke-less stator components of the motor are alternately distributed at equal angles along the circumference (i.e., their positions are staggered), that is, the C-shaped stator and the yoke-less stator are staggered in space, which can reduce the interval in time of the excitation electromagnetic torque of adjacent two phases of the traditional stator permanent magnet motor, reduce the torque ripple of the motor, and at the same time, there is only core loss on the rotor, no copper loss and permanent magnet eddy current loss, which can reduce the difficulty of motor rotor heat dissipation and improve the operation stability of the motor. Compared with the traditional motor, the winding ends are eliminated, which can reduce the copper consumption and improve the operation efficiency of the motor.

[0065] The above is only one embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present utility model, such as changing this embodiment to a polyphase multi-pole permanent magnet motor, changing the shape and thickness of the rotor, changing the cooperation angle of the three stators, changing the shape and placement position of the permanent magnet, and canceling the suspended stator and changing it to a double-stator permanent magnet motor, etc. shall all be included within the protection scope of the present utility model.

Claims

1. Modular three-stator bearingless stator permanent magnet motor structure, characterized in that: include: A stator assembly, the stator assembly comprising a C-type stator, a C-type suspended stator assembly, and a yokeless stator assembly; Rotor assembly; Casing (17) assembly; The C-type stator and C-type suspension stator assembly comprises a plurality of C-type stator components, a C-type suspension stator component, and a C-type stator frame, wherein there are at least three C-type stator components and at least four C-type suspension stator components; the C-type stator components and the C-type suspension stator components are evenly distributed along the inner circumferential wall of the C-type stator frame (6), and are connected together through the C-type stator frame (6) to form an annular structure. The yokeless stator assembly comprises a yokeless stator frame and a plurality of yokeless stator components, wherein the number of the yokeless stator components is the same as the number of the C-type stator components; the plurality of yokeless stator components are equidistantly distributed along the inner circumferential wall of the yokeless stator frame and are connected together through the yokeless stator frame (10) to form a second annular structure; The yokeless stator assembly is located inside the C-type stator and the C-type suspended stator assembly, and the geometric centers of the two coincide with each other, thereby forming a stator assembly.

2. The motor structure according to claim 1, characterized in that: The C-shaped stator component comprises: C-type stator core (1): made of soft magnetic material; The C-shaped stator permanent magnet (3) is embedded in the axial center of the C-shaped stator core (1), and the two are tightly fitted; the C-shaped stator permanent magnet (3) adopts an axial magnetization method; The C-type stator winding (2) is made of enameled wire and is wound around the C-type stator core (1). The C-type stator core (1) is isolated from the C-type stator core (1) by insulating paper to ensure electrical insulation.

3. The motor structure according to claim 1, characterized in that: The C-type suspension stator component comprises: C-type suspended stator core (4): made of soft magnetic material; The C-type suspension stator winding (5) is made of enameled wire, wound around the outside of the C-type suspension stator core (4), and isolated from the C-type suspension stator core (4) by insulating paper.

4. The motor structure according to claim 1, characterized in that: The yokeless stator component comprises: Yokeless stator core (7): made of soft magnetic material; The yokeless stator permanent magnet (9) is embedded in the axial center of the yokeless stator core (7), and the two are closely fitted; The yokeless stator winding (8) is made of enameled wire, wound around the outside of the yokeless stator core (7), and isolated from the yokeless stator core (7) by insulating paper.

5. The motor structure according to claim 1, characterized in that: The C-shaped stator frame (6) is made of non-magnetic material and is used to support and fix the C-shaped stator component and the C-shaped suspended stator component; during assembly, the eight C-shaped stator components and the eight C-shaped suspended stator components are evenly distributed along the circumference and connected together through the C-shaped stator frame to form a ring structure, thereby ensuring the symmetry and stability of the structure.

6. The motor structure according to claim 1, characterized in that: In the radial direction, the C-shaped stator components and the yokeless stator components are alternately distributed at equal angles along the circumference and assembled into a stator assembly.

7. The motor structure according to claim 1, characterized in that: The yokeless stator frame (10) is made of non-magnetic conductive material.

8. The motor structure according to claim 1, characterized in that: The rotor assembly is located inside the stator assembly, and a certain air gap is maintained between the rotor and the stator assembly to facilitate the rotational movement of the rotor; The rotor assembly comprises a C-shaped rotor core (13), a C-shaped rotor frame (14), and a rotating shaft (15). The C-shaped rotor core (13) and the C-shaped rotor frame (14) are fixed via the rotating shaft to form the rotating part of the motor.

9. The motor structure according to claim 1, characterized in that: The casing (17) assembly is used to protect and fix the entire motor structure. The casing (17) assembly includes an end cover, a casing, a base, and a junction box. The casing, the base, and the junction box are integrally cast. A stopper and a screw interface are provided on the casing to fix the end cover.

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