Low leakage magnetic spoke type rotor structure and permanent magnet synchronous motor

Abstract

The utility model relates to the technical field of permanent magnet motor, concretely relates to a kind of low magnetic flux leakage spoke type rotor structure and permanent magnet synchronous motor, including rotor magnetic pole, permanent magnet and non-magnetic support;The rotor magnetic pole is connected in split, the number of rotor magnetic pole is multiple, multiple the rotor magnetic pole is set apart between the axis circumference of non-magnetic support, the permanent magnet is arranged between two adjacent rotor magnetic poles;Traditional spoke whole piece structure is decomposed into rotor magnetic pole and non-magnetic support split structure, they can be split and assembled between, while also can make rotor magnetic pole and non-magnetic support can use different materials, effectively suppress the generation of leakage while increasing motor air gap magnetic density by tangential excitation, improve the utilization of magnetic steel and motor power density.

Description

Technical Field

[0001] This utility model relates to the field of permanent magnet motor technology, specifically to a low-leakage magnetic spoke rotor structure and a permanent magnet synchronous motor. Background Technology

[0002] Permanent magnet synchronous motors are widely used in aerospace and servo drive applications due to their high efficiency and high power density.

[0003] According to the working principle of permanent magnet synchronous motor, its high efficiency and high power density are due to the excitation of the rotor permanent magnet. In order to further improve the power density of the motor, the amplitude of the fundamental radial air gap magnetic flux density is increased by changing the rotor topology.

[0004] Compared to the built-in "-" rotor topology, the spoke rotor, due to its tangential excitation, generates magnetic flux of the same magnetic pole from two adjacent permanent magnets, which can produce a larger air gap magnetic flux density and has a "magnetic concentration" effect, thus being widely used in servo drives and other applications.

[0005] The tangential excitation of the Spoke rotor gives it a "magnetic focusing" effect, but the magnet section near the shaft will generate a large same-pole leakage flux. The traditional Spoke rotor lamination is a single piece structure. In order to reduce the same-pole leakage flux, magnetic isolation holes are opened at the bottom of the magnet near the shaft and between the magnets. The generation of leakage flux is suppressed by increasing the magnetic density of the magnetic isolation bridge formed between the magnetic isolation holes.

[0006] However, considering the mechanical strength of the rotor, the thickness of the magnetic isolation bridge cannot be too thin. Increasing its thickness will cause a large amount of magnetic flux to pass through the magnetic isolation bridge, resulting in leakage flux, low magnet utilization, and reduced power density. Utility Model Content

[0007] The purpose of this invention is to provide a low-leakage spoke rotor structure and a permanent magnet synchronous motor, thereby solving the technical problem of leakage flux in current spoke rotors.

[0008] The solution of this utility model to the above-mentioned technical problems is as follows: A low-leakage magnetic spoke rotor structure includes rotor poles, permanent magnets, and a non-magnetic support. The rotor magnetic poles are separately connected to the non-magnetic support. There are multiple rotor magnetic poles, which are arranged circumferentially around the axis of the non-magnetic support. The permanent magnet is arranged between two adjacent rotor magnetic poles.

[0009] Further specifying, the rotor magnetic pole includes multiple magnetic pole laminations, which are stacked in layers.

[0010] Further, one end of the rotor magnetic pole is provided with a boss, and multiple grooves are provided on the non-magnetic support. The multiple grooves are circumferentially spaced around the axis of the non-magnetic support, and the grooves are provided one-to-one with the rotor magnetic poles. The boss extends to the corresponding groove and cooperates with the groove. The end face of the rotor magnetic pole contacts the corresponding end face of the non-magnetic support.

[0011] Further, one end of the rotor magnetic pole is provided with multiple protrusions, and the multiple protrusions are spaced apart along the circumferential direction of the corresponding end face of the rotor magnetic pole.

[0012] Furthermore, the groove is a dovetail groove.

[0013] Further defined, the surface of the non-magnetic support is provided with multiple contact surfaces, the rotor magnetic poles and the permanent magnets are in contact with the corresponding contact surfaces, and the groove is located between two adjacent contact surfaces.

[0014] Furthermore, the non-magnetic support is sleeved on the outside of the rotor magnetic pole.

[0015] A permanent magnet synchronous motor includes a low-leakage, spoke-type rotor structure as described above.

[0016] Furthermore, the rotor magnetic poles are located inside the non-magnetic support.

[0017] A permanent magnet synchronous motor includes a low-leakage, spoke-type rotor structure as described above.

[0018] The beneficial effects of this utility model are as follows: This invention decomposes the traditional monolithic spoke structure into a separate structure of rotor magnetic poles and non-magnetic support. The two can be disassembled and assembled, and the rotor magnetic poles and non-magnetic support can be made of different materials. While increasing the air gap magnetic density of the motor through tangential excitation, it effectively suppresses the generation of leakage magnetic field, improves the utilization rate of magnets and the power density of the motor. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the rotor magnetic pole structure of this utility model; Figure 2 This is a front view of the magnetic pole lamination of this utility model; Figure 3 This is a structural diagram of the non-magnetic support of Embodiment 1 of this utility model; Figure 4 This is a side view of Embodiment 1 of the present invention when the low leakage magnetic spoke rotor is an inner rotor; Figure 5 This is a side view of Embodiment 2 of the present invention when the low leakage magnetic spoke rotor is an external rotor.

[0020] In the figure, 10-rotor magnetic pole; 11-magnetic pole lamination; 12-bore; 13-outer edge; 20-permanent magnet; 30-non-magnetic support; 31-center hole; 32-groove. Detailed Implementation

[0021] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0022] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0023] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0024] In the description of the embodiments of this utility model, it should be noted that if terms such as "upper," "lower," "horizontal," or "inner" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the utility model product is in use, they are only for the convenience of describing the utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the utility model. Furthermore, terms such as "first" and "second" are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0025] Example 1 refer to Figures 1-5 This utility model provides a low-leakage magnetic spoke type rotor structure, including rotor magnetic poles 10, permanent magnets 20 and non-magnetic support 30.

[0026] Specifically, the rotor pole 10 is made of a high-permeability material, while the non-permeable support 30 is made of a non-permeable material. The two abandon the existing integrated structure and adopt a separate structure, which makes it easier to distinguish the materials. The non-permeable support 30 is an integrated structure, which can effectively avoid the generation of same-pole leakage magnetic field. While using the "magnetic focusing" effect generated by tangential excitation, it effectively suppresses the generation of leakage magnetic field and further improves the power density of the motor.

[0027] The rotor magnetic poles 10 are multiple, and the multiple rotor magnetic poles 10 are arranged circumferentially around the axis of the non-magnetic support 30. A permanent magnet 20 is arranged between two adjacent rotor magnetic poles 10. The excitation direction of the permanent magnet 20 is tangential. In order to reduce the eddy current loss of the permanent magnet 20, the permanent magnet 20 can be divided into blocks along the radial and axial directions.

[0028] The rotor pole 10 is preferably formed by stacking and pressing multiple pole laminations 11. Adjacent pole laminations 11 are connected by snap-fit ​​or by bonding. The material of the pole laminations 11 can be silicon steel sheets.

[0029] Preferably, a boss 12 is provided at one end of the rotor magnetic pole 10, and a plurality of grooves 32 are formed on the surface of the non-magnetic support 30. The thickness direction of the grooves 32 extends along the radial direction of the non-magnetic support 30, and the length direction of the grooves 32 extends along the axial direction of the non-magnetic support 30. The plurality of grooves 32 are circumferentially spaced around the axial direction of the non-magnetic support 30. The grooves 32 are arranged one-to-one with the rotor magnetic pole 10, so that the boss 12 on each rotor magnetic pole 10 can be connected to the non-magnetic support 30 through the corresponding groove 32, and at the same time, the rotor magnetic pole 10 and the non-magnetic support 30 are in contact.

[0030] Specifically, the groove 32 is preferably a dovetail groove to ensure a stable and reliable connection with the rotor magnetic pole 10.

[0031] Optionally, in order to ensure the reliability of the connection between the rotor magnetic pole 10 and the non-magnetic support 30, the rotor magnetic pole 10 is provided with a plurality of protrusions 12. The plurality of protrusions 12 are spaced apart along the circumferential direction of the corresponding end face of the rotor magnetic pole 10. The number of corresponding grooves 32 is the same as the number of protrusions 12, and the grooves 32 and protrusions 12 are provided in a one-to-one correspondence.

[0032] Among them, the non-magnetic support 30 has multiple contact surfaces on the end face of the groove 32 for contacting the corresponding end faces of the rotor magnetic pole 10 and the permanent magnet 20. At this time, the groove 32 is located between two adjacent contact surfaces.

[0033] To further explain, an outer edge 13 is provided on both opposite sides of the other end of the rotor magnetic pole 10. The length of the outer edge 13 is set along the length direction of the rotor magnetic pole 10, and the width of the outer edge 13 extends along the array direction of the rotor magnetic pole 10 to contact the end of the permanent magnet 20. The permanent magnet 20 is located between the non-magnetic support 30 and the outer edge 13.

[0034] Through finite element analysis and comparison with existing spoke-type rotors, the low-leakage magnetic flux spoke-type rotor provided in this embodiment can effectively avoid the generation of same-pole leakage flux. By comparing back EMF, radial air gap magnetic flux density, and torque, it was found that the back EMF and radial air gap magnetic flux density of the spoke-type rotor structure proposed in this patent are higher than those of traditional rotor topologies, and the output torque is greater under the same current, further illustrating that the rotor topology proposed in this utility model has a greater torque density.

[0035] Example 2 refer to Figure 4 This embodiment provides a permanent magnet synchronous motor, including the low leakage magnetic spoke rotor structure described in Embodiment 1, wherein the low leakage magnetic spoke rotor is an inner rotor, and at this time, the rotor magnetic poles 10 are all in contact with the outer surface of the non-magnetic support 30. At this time, the groove 32 is opened on the outer surface of the non-magnetic support 30, and the contact surface is also located on the outer surface of the non-magnetic support 30.

[0036] The boss 12 is located at the bottom of the rotor magnetic pole 10. The rotor magnetic pole 10 is located on the ground on both sides of the boss 12 and is in contact with the corresponding plane. The outer edge 13 is located on both sides of the top of the rotor magnetic pole 10 and extends to the top of the permanent magnet 20.

[0037] The top of the magnetic pole lamination 11 can be trimmed, arc-shaped, or have auxiliary slots opened according to the performance requirements of the motor.

[0038] Example 3 refer to Figure 5 This embodiment provides a permanent magnet synchronous motor, including the low leakage magnetic spoke rotor structure described in Embodiment 1, wherein the low leakage magnetic spoke rotor is an outer rotor, and the non-magnetic support 30 has a central hole 31 along its axial direction. The central hole 31 is coaxially arranged with the non-magnetic support 30, and the non-magnetic support 30 is sleeved on the outside of the rotor magnetic pole 10.

[0039] The top end face of the rotor magnetic pole 10 is in contact with the inner wall of the central hole 31, and the contact surface is located on the inner surface of the central hole 31. The boss 12 is provided on the top of the rotor magnetic pole 10, and the outer edge 13 is provided on both sides of the bottom of the rotor magnetic pole 10. The bottom surface of the rotor magnetic pole 10 faces the center of the non-magnetic support 30. The groove 32 is opened on the inner surface of the central hole 31.

[0040] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. It will be apparent to those skilled in the art that this utility model is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or basic characteristics of this utility model. Therefore, the embodiments should be considered exemplary and non-limiting in all respects. The scope of this utility model is defined by the appended claims rather than the foregoing description, and thus all variations falling within the meaning and scope of equivalents of the claims are intended to be included within this utility model. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0041] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can be appropriately combined to form other embodiments that can be understood by those skilled in the art. The above content is only for illustrating the technical concept of this utility model and should not be used to limit the scope of protection of this utility model. Any modifications made to the technical solutions based on the technical concept proposed by this utility model shall fall within the scope of protection of the claims of this utility model.

[0042] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model.

Claims

1. A low-leakage-magnetic-speaker rotor structure, characterized in that, Includes rotor magnetic poles (10), permanent magnets (20), and non-magnetic support (30); The rotor magnetic pole (10) is separately connected to the non-magnetic support (30). There are multiple rotor magnetic poles (10), and the multiple rotor magnetic poles (10) are arranged circumferentially around the axis of the non-magnetic support (30). The permanent magnet (20) is arranged between two adjacent rotor magnetic poles (10).

2. The low leakage flux spoke-type rotor structure according to claim 1, characterized in that, The rotor magnetic pole (10) includes a plurality of magnetic pole laminations (11), which are stacked together.

3. The low leakage flux spoke-type rotor structure according to claim 1, characterized in that, One end of the rotor magnetic pole (10) is provided with a boss (12), and a plurality of grooves (32) are provided on the non-magnetic support (30). The plurality of grooves (32) are arranged circumferentially around the axis of the non-magnetic support (30). The grooves (32) are arranged one-to-one with the rotor magnetic pole (10). The boss (12) extends to the corresponding groove (32) and cooperates with the groove (32). The end face of the rotor magnetic pole (10) contacts the corresponding end face of the non-magnetic support (30).

4. The low leakage flux spoke-type rotor structure according to claim 3, characterized in that, The rotor magnetic pole (10) has a plurality of protrusions (12) at one end, and the plurality of protrusions (12) are spaced apart along the circumferential direction of the corresponding end face of the rotor magnetic pole (10).

5. The low leakage flux spoke-type rotor structure according to claim 3, characterized in that, The groove (32) is a dovetail groove.

6. The low leakage flux spoke-type rotor structure according to claim 3, characterized in that, The surface of the non-magnetic support (30) is provided with multiple contact surfaces, and the rotor magnetic pole (10) and the permanent magnet (20) are in contact with the corresponding contact surfaces. The groove (32) is located between two adjacent contact surfaces.

7. The low leakage flux spoke-type rotor structure according to any one of claims 1 to 6, characterized in that, The non-magnetic support (30) is sleeved on the outside of the rotor magnetic pole (10).

8. The low leakage flux spoke-type rotor structure according to any one of claims 1 to 6, characterized in that, The rotor magnetic pole (10) is located inside the non-magnetic support (30).

9. A permanent magnet synchronous motor, characterized in that, Includes the low-leakage magnetic spoke rotor structure as described in claim 7.

10. A permanent magnet synchronous motor, characterized in that, Includes the low-leakage magnetic spoke rotor structure as described in claim 8.

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