Rotor assembly and synchronous reluctance motor

Abstract

The rotor assembly comprises a rotor iron core, the rotor iron core is provided with a plurality of magnetic flux barrier groups, each magnetic flux barrier group comprises a plurality of magnetic flux barriers which are arranged at intervals along the Q-axis direction, and magnetic conduction channels are formed on two sides of the magnetic flux barriers along the Q-axis direction; in the same magnetic flux barrier group, at least two magnetic flux barriers close to the rotor axis of the rotor assembly are internally provided with connecting ribs, the connecting ribs are arranged along the Q axis, and the connecting ribs are connected with the magnetic conduction channels on the two sides of the magnetic flux barrier where the connecting ribs are located; and in the two adjacent connecting ribs along the Q-axis direction, the width of the connecting rib close to the rotor axis is greater than that of the connecting rib far away from the rotor axis. According to the utility model, the mechanical strength required by high-speed operation of the motor can be met, and enough torque output capability can be maintained at the same time.

Description

Technical Field

[0001] This utility model relates to the field of motor technology, specifically to a rotor assembly and a synchronous reluctance motor. Background Technology

[0002] In related technologies, rotor assemblies often employ multi-layer magnetic barrier structures, using circumferential magnetic bridges and radial connecting ribs to maintain the integrity and mechanical strength of the rotor core. The rotor magnetic circuit is divided into a high-permeability magnetic channel, i.e., the D-axis, and a low-permeability magnetic channel, i.e., the Q-axis. The circumferential magnetic bridge connects the high-permeability magnetic channels to meet certain mechanical strength requirements. The lower the permeability of the Q-axis and the higher the permeability of the D-axis, the stronger the motor's output torque capability.

[0003] When applied to a wider speed range, in order to ensure that the rotor strength meets the mechanical strength requirements at high speeds, existing technologies often adopt measures such as increasing the thickness of the magnetic isolation bridge or increasing the width of the connecting ribs. However, this will reduce the torque output capability of the motor and affect the motor performance. Utility Model Content

[0004] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the present invention proposes a rotor assembly that can adapt to greater forces borne on the inner side while maintaining the torque output capability of the motor.

[0005] This utility model also proposes a synchronous reluctance motor having the above-mentioned components.

[0006] In a first aspect, embodiments of this application provide a rotor assembly, the rotor assembly including a rotor core, the rotor core having multiple magnetic flux barrier groups, the multiple magnetic flux barrier groups being distributed circumferentially at intervals along the rotor core; each magnetic flux barrier group includes multiple magnetic flux barriers spaced apart along the Q-axis direction, the magnetic flux barriers forming magnetic conductive channels on both sides along the Q-axis direction; within the same magnetic flux barrier group, at least two magnetic flux barriers near the rotor axis are provided with connecting ribs, the connecting ribs being arranged along the Q-axis, the connecting ribs connecting the magnetic conductive channels on both sides of the magnetic flux barrier in which they are located; among two adjacent connecting ribs along the Q-axis direction, the width of the connecting rib near the rotor axis is greater than the width of the connecting rib away from the rotor axis.

[0007] The rotor assembly according to the embodiments of this utility model has at least the following beneficial effects: by providing connecting ribs within the magnetic flux barrier, especially using wider connecting ribs on the side closer to the rotor shaft center, it can adapt to the greater force borne on the inner side, effectively avoiding structural failure at high speeds. Furthermore, using narrower connecting ribs near the outer edge of the rotor assembly can maintain the low permeability of the Q-axis, thereby enhancing the torque output capability of the motor.

[0008] According to the first aspect, in one possible implementation, the width of the connecting rib near the outer edge of the rotor core is Lmin, where Lmin ≥ 0.5 mm; and / or;

[0009] The width of the connecting rib near the rotor shaft is Lmax, where Lmax ≤ 1.0 mm.

[0010] According to the first aspect, in one possible implementation, the outer diameter of the rotor core is R1, and the inner diameter of the rotor core is R2; the total width of the plurality of magnetic flux barriers in the same magnetic flux barrier group along the Q-axis direction is W; wherein, 0.5≤W / (R1-R2)≤0.55.

[0011] According to the first aspect, in one possible implementation, the plurality of magnetic flux barriers include a first magnetic flux barrier and at least two second magnetic flux barriers; the first magnetic flux barrier extends in a direction perpendicular to the Q-axis and is disposed near the outer edge of the rotor assembly; the second magnetic flux barrier is disposed between the first magnetic flux barrier and the rotor shaft, the second magnetic flux barrier including a first magnetic barrier portion and a second magnetic barrier portion, the first magnetic barrier portion extending in a direction perpendicular to the Q-axis and having the connecting rib disposed therein; the second magnetic barrier portion extending in a direction parallel to the D-axis on its side, the second magnetic barrier portion communicating with the first magnetic barrier portion at both ends and located radially outside the first magnetic barrier portion.

[0012] According to the first aspect, in one possible implementation, in the same magnetic flux barrier group, the widths of a plurality of first magnetic barrier portions decrease sequentially along the Q-axis away from the rotor axis, and the width of each first magnetic barrier portion is greater than the width of the first magnetic flux barrier.

[0013] According to the first aspect, in one possible implementation, the width of the first magnetic barrier portion near the rotor shaft center is W1, and the distance between the second magnetic barrier portion away from the Q axis and the D axis on its side is M1, where 0.7 ≤ 2*M1 / W1 ≤ 0.8; and / or,

[0014] The width of the first magnetic flux barrier is W. n The width of the magnetically conductive channel located on the side of the first magnetic flux barrier facing the rotor shaft is M. n 0.9≤M n / W n ≤1.0; and / or,

[0015] The width of the first magnetic barrier portion of the second magnetic flux barrier adjacent to the first magnetic flux barrier is W. n-1 The width of the magnetically conductive channel located on the side of the second magnetic flux barrier facing the rotor shaft is M. n-10.6≤M n-1 / W n-1 ≤0.7.

[0016] According to the first aspect, in one possible implementation, magnetic isolation bridges are formed between the two ends of the magnetic flux barrier and the outer edge of the rotor core. Among the plurality of magnetic isolation bridges located between the Q axis and the adjacent D axis, at least the thickness of the magnetic isolation bridge adjacent to the D axis is greater than the thickness of the magnetic isolation bridge adjacent to the Q axis.

[0017] According to the first aspect, in one possible implementation, the magnetic flux barrier includes a magnetic barrier slot that extends through the rotor core along its axial direction.

[0018] According to the first aspect, in one possible implementation, the magnetic flux barrier further includes a magnetic shielding element filled within the magnetic barrier groove.

[0019] According to the first aspect, in one possible implementation, the magnetic barrier groove includes a main groove body and a limiting groove, the limiting groove being disposed on the side wall of the main groove body so that the magnetic shielding member and the magnetic conductive channel on the side where the limiting groove is located are mutually engaged.

[0020] According to the first aspect, in one possible implementation, a portion of the main groove is parallel to the D-axis, and the limiting groove is formed on the opposite side walls of the portion of the main groove parallel to the D-axis.

[0021] According to the first aspect, in one possible implementation, the limiting grooves located on both sides of the same magnetic channel are misaligned.

[0022] Secondly, embodiments of this application also provide a synchronous reluctance motor, the synchronous reluctance motor including the rotor assembly described in the first aspect.

[0023] The synchronous reluctance motor according to the embodiments of the present invention has at least the following beneficial effects: by applying the above-mentioned rotor assembly, the mechanical strength required for the motor to run at high speed can be met, and it has sufficient torque output capability.

[0024] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0025] The present invention will be further described below with reference to the accompanying drawings and embodiments, wherein:

[0026] Figure 1 This is a schematic diagram of the rotor assembly in one embodiment of the present invention;

[0027] Figure 2This is a schematic diagram of the rotor core structure according to an embodiment of the present invention;

[0028] Figure 3 This is a simulation diagram showing the strength of the rotor core with equal-width connecting ribs according to this utility model.

[0029] Figure 4 for Figure 3 A magnified view of the area of ​​maximum stress.

[0030] Figure 5 This is a simulation diagram of the strength of the rotor core in one embodiment of the present invention;

[0031] Figure 6 for Figure 5 A magnified view of the area of ​​maximum stress.

[0032] Figure 7 This is a comparison diagram of the output torque waveforms of the rotor core and the rotor core with equal-width connecting ribs in one embodiment of this utility model;

[0033] Figure 8 This is an enlarged schematic diagram of the structure of a magnetic flux barrier group in one embodiment of the present invention;

[0034] Figure 9 for Figure 8 The diagram shows the structural dimensions.

[0035] Figure 10 This is a schematic diagram of the structure of a rotor core assembled from rotor laminations according to an embodiment of the present invention;

[0036] Figure 11 This is an enlarged schematic diagram of the structure of a magnetic flux barrier group in another embodiment of the present invention;

[0037] Figure 12 This is a schematic diagram of the structure of the magnetic barrier groove filled with a magnetic shielding component in another embodiment of the present invention;

[0038] Figure 13 This is an enlarged schematic diagram of the structure of a magnetic flux barrier group with limiting grooves of different shapes in another embodiment of the present invention;

[0039] Figure 14 This is a schematic diagram of the synchronous slot reluctance motor in an embodiment of this utility model.

[0040] Figure label:

[0041] 100, Rotor assembly; 100a, Rotor lamination; 110, Rotor core; 120, Magnetic flux barrier group; 120a, First magnetic flux barrier; 120b, Second magnetic flux barrier; 121, First magnetic barrier section; 122, Second magnetic barrier section; 123, Magnetic barrier slot; 1231, Main slot body; 1232, Limiting slot; 124, Magnetic shielding component; 130, Magnetic guiding channel; 140, Connecting rib; 150, Magnetic shielding bridge; 150a, First magnetic shielding bridge; 150b, Second magnetic shielding bridge; 160, Shaft hole; 161, Injection groove; 170, Rotor shaft; 180, Filling section; O1, Rotor shaft center; 1000, Synchronous reluctance motor; 200, Stator assembly. Detailed Implementation

[0042] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0043] In the description of this utility model, it should be understood that the directional descriptions, such as up, down, front, back, left, right, etc., indicate the directional or positional relationship based on the directional or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this 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. Therefore, they should not be construed as limitations on this utility model.

[0044] In the description of this utility model, "several" means one or more, "multiple" means two or more, "greater than," "less than," and "exceeding" are understood to exclude the stated number, while "above," "below," and "within" are understood to include the stated number. The use of "first" and "second" in the description is merely for distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or implicitly indicating the order of the indicated technical features.

[0045] In the description of this utility model, unless otherwise explicitly defined, terms such as "setting," "installation," and "connection" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this utility model in conjunction with the specific content of the technical solution.

[0046] In the description of this utility model, the terms "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of this utility model. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0047] Synchronous reluctance motors (SRRMs) are motors that operate without an excitation magnetic field. Following the principle of minimum reluctance, they utilize a special rotor design to generate reluctance torque, which drives the motor. Compared to induction motors, SRRMs offer higher power density and efficiency, a wider constant power speed range, and simpler manufacturing processes. Compared to permanent magnet synchronous motors (PMSMs), SRRMs eliminate the need for permanent magnets, resulting in lower costs, no demagnetization risk, higher reliability, and greater adaptability to various application environments. Therefore, SRRMs are widely used in compressors, home appliances, and electric vehicles, among other fields.

[0048] In related technologies, rotor assemblies often employ a multi-layered magnetic barrier structure. Circumferential magnetic bridges and radial connecting ribs maintain the integrity and mechanical strength of the rotor core. The rotor magnetic circuit is divided into a high-permeability magnetic channel (D-axis) and a low-permeability magnetic channel (Q-axis). The circumferential magnetic bridge connects the high-permeability magnetic channels to meet certain mechanical strength requirements. The lower the permeability of the Q-axis and the higher the permeability of the D-axis, the stronger the motor's output torque capability. When applied over a wide speed range, to ensure the rotor strength meets the mechanical strength requirements at high speeds, existing technologies often increase the thickness of the magnetic bridges or the width of the connecting ribs. However, this reduces the motor's torque output capability and affects motor performance.

[0049] Based on this, this application proposes a rotor assembly, such as Figure 1 and Figure 2 As shown, the rotor assembly 100 includes a rotor core 110, which has multiple flux barrier groups that are spaced apart along the axial direction of the rotor core 110 with the rotor shaft center O1 as the center. The multiple flux barrier groups should be evenly distributed.

[0050] Each flux barrier group includes multiple flux barriers 120. The multiple flux barriers 120 in the same flux barrier group are spaced apart along the Q-axis direction. The flux barriers 120 form magnetic channels 130 on both sides along the Q-axis direction. That is, the part of the rotor core 110 corresponding to the structure between two adjacent flux barriers 120 is the magnetic channel 130. The rotor core 110 is made of a magnetic material, such as silicon steel, so that it has high permeability along the extension direction of the magnetic channel 130. The arrangement of multiple flux barriers 120 along the Q-axis direction can increase the magnetic resistance in the Q-axis direction and reduce the magnetic permeability in the Q-axis direction, thereby controlling the distribution of the magnetic field and optimizing the difference in magnetic properties between the D-axis and the Q-axis.

[0051] Within the same flux barrier group, at least two flux barriers 120 near the rotor shaft center O1 are provided with connecting ribs 140. The connecting ribs 140 are arranged along the Q-axis and connect the magnetic channels 130 on both sides of the flux barrier 120. Of the two adjacent connecting ribs 140 along the Q-axis, the width of the connecting rib 140 near the rotor shaft center O1 is greater than the width of the connecting rib 140 away from the rotor shaft center O1. For ease of description, the side near the rotor shaft center O1 is defined as the inner side, and the side near the outer edge of the rotor assembly 100 is defined as the outer side. This application, by providing connecting ribs 140 within the flux barriers 120, particularly using wider connecting ribs 140 on the inner side, can accommodate the greater forces borne on the inner side, effectively preventing structural failure at high speeds. Furthermore, using narrower connecting ribs 140 on the outer side can maintain the low permeability of the Q-axis, thereby enhancing the torque output capability of the motor.

[0052] The rotor assembly 100 in this embodiment is applied to a synchronous reluctance motor for simulation, such as... Figures 3 to 6 As shown, Figure 3 This is a simulation diagram illustrating the strength of the rotor core with equal-width connecting ribs according to this utility model. Figure 4 for Figure 3 A magnified schematic diagram of the maximum stress point in the rotor assembly with equal-width connecting ribs shows that the maximum stress point is located near the magnetic bridge on the D-axis, with a maximum stress of 3.371e+08, which is close to the yield strength of the rotor core material 110. Figure 5 This is a simulation diagram of the strength of the rotor core in one embodiment of this utility model. Figure 6 for Figure 5 A magnified schematic diagram of the local area of ​​maximum stress shows that the location of maximum stress remains unchanged, but the maximum stress has decreased to 2.838e+08, a reduction of 16.02%. According to... Figure 7As can be seen from the comparison of the output torque waveforms, the maximum torque of the rotor assembly with equal-width connecting ribs is 0.86 to 0.87, and the minimum torque is 0.81 to 0.82. The maximum torque of the rotor assembly using this embodiment is 0.90 to 0.91, and the minimum torque is 0.83 to 0.84. The rotor assembly 100 provided in this embodiment can improve the overall output torque by 3.1%.

[0053] Each flux barrier group typically includes 3 to 5 flux barriers 120, but may also include more flux barriers 120; this application does not limit this. This embodiment uses 4 flux barriers 120 per flux barrier group as an example for illustration. Figure 3 and Figure 4 As shown, the four magnetic flux barriers 120 are defined as A1, A2, A3, and A4 respectively along the direction from the rotor axis O1 to the outer edge. Connecting ribs 140 can be set in magnetic flux barriers A1 and A2, or in magnetic flux barriers A1, A2, and A3, or in magnetic flux barriers A1, A2, A3, and A4.

[0054] In other words, all magnetic flux barriers 120 in this application may be provided with connecting ribs 140, or only some of the magnetic flux barriers 120 may be provided with connecting ribs 140. It should be noted that when only some of the magnetic flux barriers 120 are provided with connecting ribs 140, the magnetic flux barriers 120 with connecting ribs 140 are located on the inner side, and the magnetic flux barriers 120 without connecting ribs 140 are located on the outer side.

[0055] The width of the connecting rib 140 near the outer edge of the rotor core 110 is Lmin, where Lmin ≥ 0.5 mm. This ensures that the connecting rib 140 provides sufficient structural strength to resist the centrifugal force and mechanical stress generated by the rotor during high-speed rotation. Insufficient mechanical strength of the connecting rib 140 prevents deformation or damage to the rotor assembly 100 after prolonged operation. The width of the connecting rib 140 near the rotor shaft center O1 is Lmax, where Lmax ≤ 1.0 mm. This maintains the magnetic barrier effect and prevents the connecting rib 140 from becoming too wide, which would significantly increase the permeability in the Q-axis direction. It also prevents the connecting rib 140 from becoming the main path for magnetic flux, thus reducing the magnetic barrier effect and affecting the motor's torque output capability.

[0056] In this embodiment, the width of the connecting rib 140 is kept within a reasonable size range so that the connecting rib 140 provides a certain structural strength without significantly increasing the magnetic permeability of the Q axis, thereby maintaining the torque output capability of the motor.

[0057] like Figure 8 and Figure 9As shown, each flux barrier group includes flux barriers A1, A2, A3, and A4. Connecting ribs 140 are provided within flux barriers A1, A2, and A3. The width of the connecting rib 140 in flux barrier A1 is L1, the width of the connecting rib 140 in flux barrier A2 is L2, and the width of the connecting rib 140 in flux barrier A3 is L3. Therefore, 0.5mm ≤ L3 < L2 < L1 ≤ 1.0mm. In a preferred embodiment, L1 + L3 = 2 * L2, for example, L1 = 0.7mm, L2 = 0.6mm, and L3 = 0.5mm.

[0058] The width design of the connecting rib 140 in the rotor assembly 100 needs to strike a balance between mechanical strength and electromagnetic performance. By setting reasonable Lmin and Lmax values ​​and optimizing the design in combination with specific application scenarios and performance requirements, the torque output capability, efficiency, and stability of the motor can be significantly improved.

[0059] In some embodiments, such as Figure 8 and Figure 9 As shown, the total width of a flux barrier group should be 0.5 to 0.55 times the radial thickness of the rotor core 110, providing sufficient flux blocking area to optimize the magnetic field distribution while ensuring that the rotor core 110 has sufficient mechanical strength. Specifically, a suitable width of the flux barrier 120 can impede the magnetic flux more in the Q-axis direction, effectively reducing the permeability in the Q-axis direction; at the same time, the rotor core 110 can retain sufficient solid structure to provide sufficient mechanical strength to withstand various mechanical stresses during motor operation. Furthermore, the retained solid structure can form a magnetic channel 130, increasing the high permeability region in the D-axis direction. This design helps generate greater electromagnetic torque during motor operation, improving the motor's torque output capability under different operating conditions.

[0060] Specifically, the rotor core 110 has an overall annular structure, with an outer diameter of R1 and an inner diameter of R2. Therefore, the radial thickness of the rotor core 110 is R1-R2. Along the Q-axis away from the rotor axis O1, the widths of the multiple flux barriers 120 within the same flux barrier group are W1, W2, ..., W... n-1 W n The width of the magnetic flux barrier 120 is its dimension along the Q-axis. The total width of multiple magnetic flux barriers 120 within the same magnetic flux barrier group along the Q-axis is W. Furthermore, 0.5 ≤ W / (R1-R2) ≤ 0.55.

[0061] Based on the shape of the flux barrier 120, multiple flux barriers 120 in the same flux barrier group can be divided into a first flux barrier 120a and a second flux barrier 120b. A flux barrier group may include one first flux barrier 120a and at least two second flux barriers 120b. Figure 8 and Figure 9 As shown, in one embodiment, the flux barrier group includes a first flux barrier 120a and three second flux barriers 120b.

[0062] A first magnetic flux barrier 120a extending in a direction perpendicular to the Q-axis can effectively block magnetic flux flow along the Q-axis. The first magnetic flux barrier 120a is located near the outer edge of the rotor assembly 100 and does not have connecting ribs 140, thus preventing the formation of a continuous channel along the Q-axis on the rotor core 110. A second magnetic flux barrier 120b is disposed between the first magnetic flux barrier 120a and the rotor shaft O1. The second magnetic flux barrier 120b includes a first magnetic barrier portion 121 and a second magnetic barrier portion 122. The first magnetic barrier portion 121 extends in a direction perpendicular to the Q-axis. Similar to the first magnetic flux barrier 120a, part 121 can, together with the first magnetic flux barrier 120a, separate multiple magnetically conductive channels 130 perpendicular to the Q-axis. The first magnetic barrier part 121 is provided with connecting ribs 140, which can enhance the structural strength. The second magnetic barrier part 122 extends along the D-axis parallel to its side. The second magnetic barrier part 122 is connected to the first magnetic barrier part 121 at both ends and is located radially outside the first magnetic barrier part 121. The second magnetic barrier part 122 is parallel to the D-axis, which helps to guide the magnetic flux to flow along the D-axis direction, thereby further optimizing the electromagnetic performance of the motor.

[0063] In other embodiments, the first magnetic flux barrier 120a may have a similar structure to the second magnetic flux barrier 120b, that is, the first magnetic flux barrier 120a may also include a first magnetic barrier portion 121 and a second magnetic barrier portion 122, but the first magnetic flux barrier 120a does not have a connecting rib 140; the first magnetic flux barrier 120a may extend in a direction perpendicular to the Q axis and the connecting rib 140 may be provided in the first magnetic flux expansion; even multiple magnetic flux barriers 120 in the magnetic flux barrier group may not have a first magnetic flux barrier 120a and may be composed entirely of second magnetic flux barriers 120b; this application does not limit this.

[0064] The width of the first magnetic flux barrier 120a is W n Along the Q-axis away from the rotor axis O1, the width of the second magnetic flux barrier 120b is W1 to W... n-1 Among them, W1 to W nThe magnetic flux barriers 120 are arranged in a decreasing order. That is, in the same magnetic flux barrier group, along the Q-axis direction, the width of the magnetic flux barrier 120 near the rotor shaft center O1 is greater than the width of the magnetic flux barrier 120 near the outer edge of the rotor core 110. The main function of the magnetic flux barriers 120 is to form obstacles in the magnetic circuit, causing uneven distribution of magnetic flux in the rotor, thereby generating reluctance torque. When the width of the magnetic flux barrier 120 near the rotor shaft center O1 is larger, the magnetic reluctance in that region will increase accordingly, which helps to generate a larger reluctance torque during motor operation.

[0065] When the magnetic flux barrier 120 is divided into a first magnetic flux barrier 120a and a second magnetic flux barrier 120b, the width of each first magnetic flux barrier portion 121 is greater than the width of the first magnetic flux barrier 120a; and among two adjacent first magnetic flux barrier portions 121 along the Q-axis direction, the width of the outer first magnetic flux barrier portion 121 is smaller than the width of the inner first magnetic flux barrier portion 121.

[0066] The width ratio of the magnetic flux barrier 120 to the inner magnetic channel 130 affects torque performance. By controlling the width ratio of the magnetic flux barrier 120 to the inner magnetic channel 130 when designing the rotor assembly 100, sufficient magnetic resistance can be formed in the Q-axis direction while reducing torque pulsation and improving the output torque of the motor.

[0067] In one embodiment, the distance between the second magnetic barrier 122, which is away from the Q-axis, and the D-axis on its side is M1. The widths of the plurality of magnetically conductive channels 130 formed between the second magnetic flux barrier 120b, which is close to the rotor shaft center O1, and the first magnetic flux barrier 120a are M2, ..., M1, respectively. n-1 M n The magnetic channel 130 is arranged with a uniform width along its extension path, that is, the width of the magnetic channel 130 located on the side of the first magnetic flux barrier 120a facing the rotor shaft center O1 is M. n ,0.7≤2*M1 / W1≤0.8, 0.6≤M2 / W2≤0.7, 0.6≤M n-1 / W n-1 ≤0.7, 0.9≤M n / W n ≤1.0.

[0068] It is important to note that the specific value of the width ratio between the aforementioned magnetic flux barrier 120 and its inner magnetic channel 130 is not absolute, but needs to be adjusted according to the specific design goals, operating environment, and performance requirements of the motor. In actual design, the optimal width ratio combination may need to be determined through simulation analysis, experimental verification, and other methods.

[0069] In a specific example of this application, the magnetic flux barrier group includes one first magnetic flux barrier 120a and three second magnetic flux barriers 120b, i.e., n=4, W1=4.7, M1=1.7, then 2*M1 / W1=0.72; W2=4.3, M2=3, M2 / W2=0.70; W3=3.8, M3=2.5, M3 / W3=0.66; W4=3, M4=2.7, M4 / W4=0.90.

[0070] Each magnetic flux barrier 120 has a magnetic isolation bridge 150 formed between its two ends and the outer edge of the rotor core 110. Among the magnetic isolation bridges 150 formed between the ends of multiple magnetic flux barriers 120 and the outer edge of the rotor core 110 in the same magnetic flux barrier group, at least the thickness of the magnetic isolation bridge 150 adjacent to the D-axis is greater than the thickness of the magnetic isolation bridge 150 adjacent to the Q-axis. This application specifically increases the width of the magnetic isolation bridge 150 near the D-axis to match the stress magnitude of each magnetic isolation bridge 150, thereby meeting the rotor's mechanical strength requirements.

[0071] like Figures 2 to 9 As shown, the magnetic isolation bridge 150 formed between the end of the first magnetic flux barrier 120a and the outer edge of the rotor core 110 is the first magnetic isolation bridge 150a; the magnetic isolation bridge 150 formed between the end of the second magnetic barrier portion 122 away from the first magnetic barrier portion 121 and the outer edge of the rotor core 110 is the second magnetic isolation bridge 150b; the width of the first magnetic isolation bridge 150a is B. n Along the Q-axis away from the rotor axis O1, the widths of the second magnetic isolation bridges 150b corresponding to the multiple second magnetic flux barriers 120b are B1, B2, ..., B, respectively. n-1 In the first magnetic isolation bridge 150a and multiple second magnetic isolation bridges 150b located between the Q-axis and the adjacent D-axis, B1≥B2≥…≥B n-1 ≥B n And B1 > B n .

[0072] In a specific example of this application, B1 = 1, B2 = 1, B3 = 0.8, and B4 = 0.8.

[0073] In other embodiments, among the multiple magnetic isolation bridges 150 formed between the ends of the multiple magnetic flux barriers 120 in the same magnetic flux barrier group and the outer edge of the rotor core 110, the width of the magnetic isolation bridge 150 increases in the direction away from the Q axis.

[0074] It is important to note that the width of the magnetic isolation bridge 150 not only affects the mechanical strength of the rotor core 110, but the ratio of the width of the magnetic isolation bridge 150 to the width of the second magnetic barrier section 122 also affects the leakage flux of the rotor core 110, thus affecting the torque output capability. By controlling the ratio of the width of the magnetic isolation bridge 150 to the width of its corresponding second magnetic barrier section 122 during rotor design, the output torque can be maximized while meeting the rotor's mechanical strength requirements.

[0075] In one embodiment, within the same flux barrier group, along the Q-axis away from the rotor axis O1, the widths of the second magnetic barrier portions 122 of the plurality of second flux barriers 120b are H1, H2, ..., H, respectively. n-1 0.4≤B1 / H1≤0.5, 0.4≤B2 / H2≤0.5, 0.3≤B n-1 / H n-1 ≤0.4, and B n-1 =B n .

[0076] The specific value of the ratio between the width of the aforementioned magnetic isolation bridge 150 and the width of its corresponding first magnetic flux barrier 120a or second magnetic barrier section 122 is not absolute, but needs to be adjusted according to the specific design goals, working environment, and performance requirements of the motor. In a specific embodiment, n = 4, H1 = 2, B1 / H1 = 0.5; H2 = 2.4, B2 / H2 = 0.42; H3 = 2.1, B3 / H3 = 0.38.

[0077] In this application, the flux barrier 120 can be an air gap magnetic barrier or made of a non-magnetic material. The permeability of air and non-magnetic materials in the air gap magnetic barrier is much lower than that of the rotor core 110 material. The flux barrier 120 can form magnetic resistance on the Q-axis magnetic circuit, thereby reducing the permeability of the Q-axis.

[0078] In the first example of the above embodiments, as Figure 2 As shown, the magnetic flux barrier 120 adopts an air gap magnetic barrier, that is, the magnetic flux barrier 120 may include a magnetic barrier groove 123. The magnetic barrier groove 123 penetrates the entire rotor core 110 along the axial direction of the rotor core 110 to form an air gap magnetic barrier. Different magnetic guiding channels 130 are separated by the special structural shape and position of the magnetic barrier groove 123, thereby guiding the magnetic flux to flow along a predetermined path.

[0079] The design of the air gap magnetic barrier is relatively simple, requiring no additional non-magnetic materials. The magnetic barrier slots 123 are formed simply by machining the rotor core 110, making it easy to implement. For example, as... Figure 10As shown, the rotor core 110 is formed by stacking multiple rotor laminations 100a axially, and the cross-sectional shape of the rotor laminations 100a is consistent with the cross-sectional shape of the rotor core 110. Therefore, only the shape of the stamping die needs to be adjusted, i.e., the empty slots required for one-time forming. When multiple rotor laminations 100a are stacked axially to form the rotor core 110, the empty slots of the multiple rotor laminations 100a are aligned to form a magnetic barrier slot 123 that runs through the entire rotor core 110.

[0080] The edges of the magnetic barrier groove 123 can be chamfered to reduce stress concentration at the edges and improve the overall mechanical strength of the rotor core 110. Specifically, the apex of each magnetic barrier groove 123 can be rounded, and the ends of the magnetic barrier groove 123 can be arc segments concentric with the outer edge of the rotor core 110.

[0081] In the second example of the above embodiments, such as Figure 1 , Figure 11 and Figure 12 As shown, the magnetic flux barrier 120 is made of a non-magnetic material. Specifically, the rotor core 110 also has an axially penetrating magnetic barrier groove 123. The difference between the second example and the first example is that the magnetic flux barrier 120 further includes a magnetic isolation element 124, which fills the magnetic barrier groove 123. The magnetic isolation element 124 is a solid structure and can also block the direct propagation path of magnetic flux at the magnetic barrier groove 123, thereby increasing the magnetic resistance along the Q-axis and guiding the magnetic flux to flow along a predetermined path.

[0082] The magnetic shielding element 124 is made of a non-magnetic material, such as plastic, ceramic, or polymer composite material. These materials have very low magnetic permeability, thus effectively blocking magnetic fields.

[0083] The magnetic shielding component 124 can be connected to the inner wall of the magnetic barrier groove 123 by bonding, embedding, or other means to form an integral structure. This connection method not only ensures the stability and reliability of the magnetic shielding component 124, but also helps to improve the overall structural strength of the rotor assembly 100.

[0084] The magnetic shielding component 124 can be formed by injection molding. The injection molding material can be PBT (polybutylene terephthalate), PBT+glass fiber (glass fiber reinforced polybutylene terephthalate), PA6 (polyamide 6), etc. The magnetic shielding component 124 is connected to the rotor lamination 100a to form a whole through injection molding, thereby improving the overall structural strength of the rotor core 110 and avoiding the problem of breakage caused by the large stress of the magnetic bridge 150 under centrifugal force when the rotor core 110 rotates at high speed.

[0085] Based on the second example above, such as Figure 11As shown, the magnetic barrier groove 123 may include a main groove body 1231 and a limiting groove 1232. The limiting groove 1232 is provided on the side wall of the main groove body 1231. The magnetic shielding member 124 corresponding to the limiting groove 1232 has toothed protrusions, which are fitted into the limiting groove 1232 in a one-to-one correspondence. The main function of the limiting groove 1232 is to make the magnetic shielding member 124 fit into the magnetic channel 130 on the side where the limiting groove 1232 is located, thereby increasing the connection strength and stability between the magnetic shielding member 124 and the rotor core 110, and making the magnetic shielding member 124 less likely to fall off or loosen when the rotor assembly 100 rotates at high speed.

[0086] Furthermore, the portion of the main groove 1231 corresponding to the first magnetic barrier 121 is the first groove, and the portion corresponding to the second magnetic barrier 122 is the second groove. Since the first groove is perpendicular to the Q-axis, when the rotor assembly 100 rotates at high speed, the magnetic channel 130 has sufficient strength to support and limit the magnetic shielding member 124 within the groove 1232. The second groove is parallel to the D-axis, and the limiting groove 1232 can be formed on the opposite side walls of the second groove. Since the portion of the magnetic shielding member 124 located within the second groove is parallel to the D-axis, when the rotor assembly 100 rotates at high speed, the magnetic shielding member 124 is subjected to centrifugal force and tends to compress the magnetic bridge 150. By providing the limiting groove 1232 on the side wall of the second groove, the deformation and displacement of the magnetic shielding member 124 along the D-axis direction can be limited, thereby avoiding compression of the magnetic bridge 150, which allows for a smaller width of the magnetic bridge 150 and reduces magnetic leakage.

[0087] In a preferred embodiment, the limiting grooves 1232 located on both sides of the same magnetic channel 130 are staggered. The staggered limiting grooves 1232 can avoid the formation of continuous slits, thereby reducing the risk of saturation of the magnetic channel 130, helping to maintain high permeability along the D-axis direction, and ensuring the magnetic flux efficiency of the motor.

[0088] Specifically, such as Figure 11 and Figure 13 As shown, the limiting grooves 1232 can be regular or irregular shapes such as arc, rectangle, or dovetail groove. Without causing rotor core 110 saturation and affecting motor performance, the more limiting grooves 1232 there are and the larger their area, the higher the mechanical strength of the rotor assembly 100.

[0089] The rotor core 110 can be formed by stacking multiple rotor laminations axially, and the cross-sectional shape of the rotor laminations is consistent with the cross-sectional shape of the rotor core 110.

[0090] When the magnetic shielding component 124 and the rotor core 110 are injection molded into an integral structure, the first end of the magnetic flux barrier 120 is spaced apart from the outer edge of the rotor core 110, thereby forming a magnetic bridge 150 on the portion of the rotor core 110 between the outer edge and the first end of the magnetic flux barrier 120; the second end of the magnetic flux barrier 120 forms an opening at the outer edge of the rotor core 110. The open magnetic flux barrier 120 further reduces magnetic leakage. Along the circumference of the rotor core 110, the openings and magnetic bridges 150 are alternately arranged. This layout maintains the continuity of the rotor core 110 while effectively reducing magnetic leakage through the openings, preventing structural weakening due to excessive openings.

[0091] like Figure 1 , Figure 11 and Figure 12 As shown, the rotor assembly 100 also includes a rotor shaft 170, and the rotor core 110 has a shaft hole 160, within which the rotor shaft 170 is disposed. By injection molding a filling portion 180 within the shaft hole 160, the rotor shaft 170 and the rotor core 110 can be securely connected together to form an integral structure. This connection method not only simplifies the assembly process but also improves the overall rigidity and durability of the rotor assembly 100.

[0092] The rotor core 110 has multiple injection grooves 161 designed on the edge of the shaft hole 160. During the injection molding process, the filling part 180 fills these injection grooves 161 and forms radial protrusions after cooling and solidification. These radial protrusions fit tightly with the injection grooves 161, increasing the contact area between the rotor shaft 170 and the rotor core 110, thereby improving the efficiency of torque transmission.

[0093] In addition, this application also proposes a synchronous reluctance motor, such as Figure 14 As shown, the synchronous reluctance motor 1000 includes the rotor assembly 100 as described above. Thanks to the improvements to the rotor assembly 100 in the above embodiments, the synchronous reluctance motor 1000 of this utility model has the same technical effects as the rotor assembly 100 in the above embodiments, which will not be repeated here.

[0094] The synchronous reluctance motor 1000 typically also includes components such as a stator assembly 200 and a motor housing, which will not be described in detail in this application.

[0095] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present invention. Furthermore, the embodiments of the present invention and the features thereof can be combined with each other unless otherwise specified.

Claims

1. A rotor assembly, characterized in that, The rotor core includes a rotor core having multiple magnetic flux barrier groups, which are distributed circumferentially along the rotor core. Each magnetic flux barrier group includes multiple magnetic flux barriers spaced apart along the Q-axis, and the magnetic flux barriers form magnetic conductive channels on both sides along the Q-axis. Within the same magnetic flux barrier group, at least two magnetic flux barriers near the rotor axis of the rotor assembly are provided with connecting ribs. The connecting ribs are arranged along the Q-axis and connect the magnetic conductive channels on both sides of the magnetic flux barrier where they are located. Among two adjacent connecting ribs along the Q-axis, the width of the connecting rib closer to the rotor axis is greater than the width of the connecting rib farther from the rotor axis.

2. The rotor assembly according to claim 1, characterized in that, The width of the connecting rib near the outer edge of the rotor core is Lmin, where Lmin ≥ 0.5 mm; and / or; The width of the connecting rib near the rotor shaft is Lmax, where Lmax ≤ 1.0 mm.

3. The rotor assembly according to claim 1, characterized in that, The outer diameter of the rotor core is R1, and the inner diameter of the rotor core is R2; the total width of multiple magnetic flux barriers in the same magnetic flux barrier group along the Q-axis is W; Wherein, 0.5≤W / (R1-R2)≤0.

55.

4. The rotor assembly according to claim 1, characterized in that, In the same magnetic flux barrier group, the plurality of magnetic flux barriers include a first magnetic flux barrier and at least two second magnetic flux barriers; The first magnetic flux barrier extends in a direction perpendicular to the Q-axis and is disposed near the outer edge of the rotor assembly; The second magnetic flux barrier is disposed between the first magnetic flux barrier and the rotor shaft. The second magnetic flux barrier includes a first magnetic barrier portion and a second magnetic barrier portion. The first magnetic barrier portion extends in a direction perpendicular to the Q axis and is provided with the connecting rib. The second magnetic barrier portion extends in a direction parallel to the D axis on its side. The second magnetic barrier portion communicates with the first magnetic barrier portion at both ends and is located radially outside the first magnetic barrier portion.

5. The rotor assembly according to claim 4, characterized in that, In the same magnetic flux barrier group, the width of multiple first magnetic barrier sections decreases sequentially along the Q-axis away from the rotor axis, and the width of each first magnetic barrier section is greater than the width of the first magnetic flux barrier.

6. The rotor assembly according to claim 4, characterized in that, The width of the first magnetic barrier portion near the rotor shaft center is W1, and the distance between the second magnetic barrier portion away from the Q axis and the D axis on its side is M1, where 0.7 ≤ 2*M1 / W1 ≤ 0.8 and / or The width of the first magnetic flux barrier is W. n The width of the magnetically conductive channel located on the side of the first magnetic flux barrier facing the rotor shaft is M. n 0.9≤M n / W n ≤1.0; and / or, The width of the first magnetic barrier portion of the second magnetic flux barrier adjacent to the first magnetic flux barrier is W. n-1 The width of the magnetically conductive channel located on the side of the second magnetic flux barrier facing the rotor shaft is M. n-1 0.6≤M n-1 / W n-1 ≤0.

7.

7. The rotor assembly according to claim 1, characterized in that, The magnetic flux barrier forms a magnetic isolation bridge between its two ends and the outer edge of the rotor core. Among the multiple magnetic isolation bridges located between the Q axis and the adjacent D axis, at least the magnetic isolation bridge adjacent to the D axis has a thickness greater than the magnetic isolation bridge adjacent to the Q axis.

8. The rotor assembly according to claim 1, characterized in that, The magnetic flux barrier includes a magnetic barrier groove that extends through the rotor core along its axial direction.

9. The rotor assembly according to claim 8, characterized in that, The magnetic flux barrier also includes a magnetic shielding component filled within the magnetic barrier groove.

10. The rotor assembly according to claim 9, characterized in that, The magnetic barrier groove includes a main groove body and a limiting groove. The limiting groove is disposed on the side wall of the main groove body so that the magnetic shielding component and the magnetic guiding channel on the side where the limiting groove is located can be interlocked.

11. The rotor assembly according to claim 10, characterized in that, A portion of the main groove is parallel to the D-axis, and the limiting groove is formed on the opposite side walls of the portion of the main groove parallel to the D-axis.

12. The rotor assembly according to claim 10, characterized in that, The limiting grooves located on both sides of the same magnetic channel are misaligned.

13. A synchronous reluctance motor, characterized in that, Includes the rotor assembly as described in any one of claims 1 to 12.

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