Modular three-stator bearingless stator permanent magnet motor structure

Abstract

The invention relates to a permanent magnet motor, in particular to a modular three-stator bearingless stator permanent magnet motor structure. According to the motor, the torque magnetic flux and the 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 invention relates to a permanent magnet motor, and in particular to a modular three-stator bearingless stator permanent magnet motor structure. Background Art

[0002] In traditional electric traction systems, the rotor of the 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 friction 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 cause the components to heat up, making the lubricant performance worse, further aggravating the wear and aging of the bearings. In severe cases, this will cause uneven air gaps in the motor, heating of the windings, and increased temperatures, thereby reducing the efficiency of the motor, increasing energy consumption, and shortening its service life. These problems not only increase maintenance costs, but may also affect the reliability and safety of the entire system. Summary of the invention

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

[0004] To achieve the above object, the present invention adopts the following technical solutions, including:

[0005] The stator assembly includes a C-type stator, a C-type suspended stator assembly, and a yokeless stator assembly.

[0006] Rotor assembly.

[0007] Casing assembly.

[0008] The C-type stator and C-type suspended stator assembly include a plurality of C-type stator components, a C-type suspended stator component, and a C-type stator frame, wherein the number of C-type stator components is at least 3, that is, m or an integer multiple of m (m is an integer of 3 or greater), and the number of C-type suspended stator components is at least 4, that is, 4 or an integer multiple of 4; the C-type stator components and the C-type suspended stator components are evenly distributed along the circumferential inner wall of the C-type stator frame (6), and are connected together through the C-type stator frame to form a ring structure.

[0009] The yokeless stator assembly includes a yokeless stator frame and multiple yokeless stator components, wherein the number of the yokeless stator components is equal to the number of C-type stator components; the multiple yokeless stator components are equidistantly distributed along the circumferential inner wall of the yokeless stator frame, and are connected together through the yokeless stator frame to form an annular structure 2.

[0010] 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.

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

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

[0013] C-type stator permanent magnet: embedded in the axial center of the C-type stator core, and the two fit tightly; the C-type stator permanent magnet adopts axial magnetization.

[0014] C-type stator winding: Made of enameled wire, it is wound around the C-type stator core (1) and is isolated from the C-type stator core by insulating paper to ensure electrical insulation.

[0015] Furthermore, the C-type suspension stator component comprises:

[0016] C-type suspended stator core: made of soft magnetic material.

[0017] C-type suspension stator winding: Made of enameled wire, wound around the C-type suspension stator core (4), and isolated from the C-type suspension stator core by insulating paper.

[0018] Furthermore, the yokeless stator component comprises:

[0019] Yokeless stator core: made of soft magnetic material.

[0020] The yokeless stator permanent magnet is embedded in the axial center of the yokeless stator core (7), and the two are tightly fitted.

[0021] Yokeless stator winding: made of enameled wire, wound around the outside of the yokeless stator core (7), and isolated from the yokeless stator core by 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 suspended stator component; during assembly, 8 C-shaped stator components and 8 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, ensuring the symmetry and stability of the structure.

[0023] Furthermore, the number of yokeless stator components is equal to the number of C-type stator components. In the radial direction, the C-type stator components and the yokeless stator components are alternately distributed at equal angles along the circumference (ie, their positions are staggered) and assembled into a stator assembly.

[0024] Furthermore, the yokeless stator frame is made of non-magnetic conductive material.

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

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

[0027] Furthermore, the casing 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 cast as one piece. The casing is provided with a stopper and a screw interface to fix the end cover.

[0028] Compared with the prior art, the present invention has beneficial effects.

[0029] The stator and rotor of the present invention are modularized, simple to manufacture, convenient to assemble, and reduce the weight and manufacturing cost of the motor.

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

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

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

[0033] The present invention is further described below in conjunction with the accompanying drawings and specific implementation methods. The protection scope of the present invention is not limited to the following description.

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

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

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

[0037] Figure 4 It is an overall structural diagram of the yokeless stator assembly of the motor of the present invention.

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

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

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

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

[0042] Fig. 9 It is a structural diagram of a single yokeless stator component of the motor of the present invention.

[0043] Fig.10 It is a structural diagram of a single C-shaped stator core of the motor of the present invention.

[0044] Fig.11 It is a structural diagram of a single C-shaped suspended stator core of the motor of the present invention.

[0045] Fig.12 It is a structural diagram of a single yokeless stator core of the motor of the present invention.

[0046] Fig.13 It is a structural diagram of the motor winding of the present invention.

[0047] Fig.14 It is a structural diagram of the permanent magnet of the motor of the present invention.

[0048] Fig.15 It is the overall structural diagram of the motor rotor assembly of the present invention.

[0049] Fig.16 It is a disassembled diagram of the overall structure of the motor rotor assembly of the present invention.

[0050] Fig.17 It is a structural diagram of a single rotor of the motor of the present invention.

[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, 12 are air gaps, 13, C-type rotor core, 14, C-type rotor frame, 15, rotating shaft, 16, end cover, 17, casing, 18, base, 19, junction box. DETAILED DESCRIPTION

[0052] In order to make the purpose, technical scheme and beneficial effects of the embodiments of the present invention clearer, the technical scheme in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments.

[0053] Based on the modular three-stator bearingless stator permanent magnet motor of the present invention, the following content is described with the phase number m being 4. The axial direction in this embodiment is the direction of the motor shaft centerline, and the radial direction is the straight line direction along the diameter, that is, the straight line direction perpendicular to the axial direction.

[0054] like Figure 1-17As shown, the modular three-stator bearingless stator permanent magnet motor structure includes a 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 casing assembly.

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

[0056] Embodiment 1, C-type stator core 1, C-type suspension stator core 4, yokeless stator core 7 are made of soft magnetic material, and the upper curvature is processed by mechanical processing. C-type stator winding 2, C-type suspension stator winding 5, yokeless stator winding 8 are wound by enameled wire. C-type stator frame 6 and yokeless stator frame 10 are processed by non-magnetic material.

[0057] A C-type stator permanent magnet 3 is placed in the axial center of the C-type stator core 1, and a yokeless stator permanent magnet 9 is placed in the axial center of the yokeless stator core 7 and fits tightly with the permanent magnets. The C-type stator permanent magnet 3 and the yokeless stator permanent magnet 9 are magnetized axially.

[0058] Embodiment 2, the C-type stator core 1 and the C-type stator permanent magnet 3 are wound with insulating paper and C-type stator winding 2, with the insulating paper inside and the C-type stator winding 2 outside. This is a single C-type stator component. Similarly, the C-type suspended stator core 4 is wound with insulating paper and C-type suspended stator winding 5, with the insulating paper inside and the C-type suspended stator winding 5 outside. This is a single C-type suspended stator component. 8 C-type stator components, 8 C-type suspended stator components and the C-type stator frame 6 are assembled into a C-type stator and a C-type suspended stator assembly.

[0059] Embodiment 3, the yokeless stator core 7 and the permanent magnet 9 are wound with insulating paper and a yokeless stator winding 8, with the insulating paper inside and the yokeless stator winding 8 outside. This is a single yokeless stator component. The same number of yokeless stator components are assembled into a yokeless stator assembly in conjunction with a yokeless stator frame 10. The geometric centers of the C-type stator, the C-type suspended stator assembly, and the yokeless stator assembly coincide, and the C-type suspended stator component and the yokeless stator component are assembled into a stator assembly at the same circumferential angle in the radial direction.

[0060] Embodiment 4, the rotor assembly includes a C-type rotor core 13, a C-type rotor frame 14, and a rotating shaft 15. The C-type rotor core 13 is made of soft magnetic material, and its upper curvature is machined by mechanical processing. The C-type rotor frame 14 can be processed by non-magnetic material. The rotating shaft 15 is also made of non-magnetic material. In order to prevent the C-type rotor 13 from detaching from the C-type rotor frame 14 when the motor runs at high speed, necessary protective measures must be taken on the rotor. The C-type stator and the C-type suspended stator assembly cooperate with the C-type rotor assembly to form an air gap 11, and the yokeless stator assembly and the C-type rotor assembly cooperate to form an air gap 12.

[0061] Embodiment 5, the rotor assembly includes a C-type rotor core 13, a C-type rotor frame 14, and a rotating shaft 15. The C-type rotor core 13 is made of soft magnetic material, and its upper curvature is machined by mechanical processing. The C-type rotor frame 14 can be machined with non-magnetic material. The rotating shaft 15 is also made of non-magnetic material. In order to prevent the C-type rotor core 13 from detaching from the C-type rotor frame 14 when the motor runs at high speed, necessary protective measures must be taken on the rotor. The C-type rotor core 13 and the C-type rotor frame 14 are fixed by the rotating shaft to form the rotating part of the motor.

[0062] Embodiment 6: The housing assembly of the motor includes an end cover 16, a housing 17, a base 18, and a terminal box 19, wherein the housing 17, the base 18, and the terminal box 19 are integrally cast, and a stopper and a screw interface are provided on the housing 17 to fix the end cover 16. There are two motor end covers 16, both of which are provided with stoppers and fixed to both sides of the housing 17 by stoppers and screws.

[0063] The outgoing wire ends of the C-type stator winding 2, the C-type suspension stator winding 5, and the yokeless stator winding 8 are led out through the stator frames 6 and 10 and assembled in the junction box 19. When the windings are led out to the junction box 19, necessary winding protection and insulation measures must be taken to prevent winding damage and leakage.

[0064] The stator and rotor of the modular three-stator bearingless stator permanent magnet motor of the present invention are modularized, simple to manufacture, easy to assemble, and reduce the cost of the motor; the present invention cancels the motor bearing, which has the advantages of no wear, maintenance-free, no lubrication, etc. that ordinary motors do not have; at the same time, the motor C-type stator component and the yokeless stator component are alternately distributed along the circumference at equal angles (that is, the positions are staggered with each other), that is, the C-type stator and the yokeless stator are staggered in space, which can reduce the time interval of the electromagnetic torque excited by the adjacent two phases of the traditional stator permanent magnet motor, and can reduce the motor torque pulsation. At the same time, there is only core loss on the rotor, and there is no copper loss and permanent magnet eddy current loss, which can reduce the difficulty of heat dissipation of the motor rotor and improve the running stability of the motor. Compared with the traditional motor, the winding end is cancelled, which can reduce the amount of copper and improve the running efficiency of the motor.

[0065] The above description is only one embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention, such as changing the present embodiment to a multi-phase multi-pole permanent magnet motor, changing the rotor shape and thickness, changing the three stator matching angles, changing the permanent magnet shape and placement position, and canceling the suspended stator and changing it to a double-stator permanent magnet motor, etc., should be included in the protection scope of the present invention.

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-type rotor core (13), a C-type rotor frame (14), and a rotating shaft (15). The C-type rotor core (13) and the C-type rotor frame (14) are fixed by 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.

10. The motor structure according to claim 1, characterized in that: When the motor has a 4-phase 8 / 6-pole structure, the number of C-type stator components and C-type suspension stator components is equal to 8; the C-type stator components and C-type suspension stator components are alternately and evenly spaced along the inner circumferential wall of the C-type stator frame (6).

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