Rotor assembly and synchronous reluctance motor

Abstract

The utility model discloses a rotor assembly and a synchronous reluctance motor, the rotor assembly comprises first punching sheets and second punching sheets, at least one first punching sheet and at least one second punching sheet are alternately laminated, and the first punching sheet is provided with a first magnetic flux barrier; a first magnetic isolation bridge is formed between one end of the first magnetic flux barrier and the outer side edge, and a first opening is formed in the outer side edge at the other end; the second punching sheet is provided with a second magnetic flux barrier; a second magnetic isolation bridge is formed between one end of the second magnetic flux barrier and the outer side edge, and a second opening is formed in the outer side edge at the other end; the first magnetic flux barrier and the second magnetic flux barrier are aligned in the axial direction, and the first opening and the second magnetic isolation bridge are aligned in the axial direction. The first magnetic isolation bridge is aligned with the second opening in the axial direction. According to the utility model, the magnetic flux barriers of the first punching sheet and the second punching sheet both adopt the opening design, and the magnetic circuits at the positions are isolated by the openings, so that the magnetic leakage can be effectively reduced, and the Q-axis magnetic resistance can be increased, thereby improving the output torque of the motor and the working efficiency of the motor.

Description

TECHNICAL FIELD

[0001] The utility model relates to motor technical field, concretely relates to a rotor assembly and synchronous reluctance motor. BACKGROUND

[0002] In the related art, the rotor assembly often adopts the scheme of a magnetic isolation bridge and a multi-layer magnetic barrier structure. Due to the presence of the air gap magnetic barrier, the rotor magnetic circuit is divided into a high-permeability magnetic channel, i.e., a D-axis, and a low-permeability magnetic channel, i.e., a Q-axis. The magnetic isolation bridge connects the high-permeability magnetic channel to meet certain mechanical strength. When the permeability of the Q-axis is lower and the permeability of the D-axis is higher, the motor output torque capacity is stronger.

[0003] Due to the limitation of the high-speed stamping process on the minimum magnetic isolation bridge thickness of the stamping sheet, the width of the magnetic isolation bridge is easily too large, which increases the Q-axis permeability and reduces the D-axis permeability, thereby reducing the motor output torque. SUMMARY

[0004] The utility model aims at at least solves one of the technical problems existing in the prior art. To this end, the utility model provides a rotor assembly, which can improve the motor output torque and improve the motor working efficiency while ensuring the structural strength.

[0005] In a first aspect, the embodiments of the present application provide a rotor assembly, comprising:

[0006] The first stamping sheet has at least two first magnetic flux barriers arranged at intervals along the Q-axis direction; the first magnetic flux barrier includes a first part and a second part arranged on the two sides of the Q-axis, and a first magnetic isolation bridge is formed between the first part away from the Q-axis and the outer side edge of the first stamping sheet, and a first opening is formed on the outer side edge of the first stamping sheet by the end of the second part away from the Q-axis;

[0007] The second stamping sheet has at least two second magnetic flux barriers arranged at intervals along the Q-axis direction; the second magnetic flux barrier includes a third part and a fourth part arranged on the two sides of the Q-axis, and a second opening is formed on the outer side edge of the second stamping sheet by the end of the third part away from the Q-axis, and a second magnetic isolation bridge is formed between the fourth part away from the Q-axis and the outer side edge of the second stamping sheet;

[0008] At least one of the first stamping sheet and at least one of the second stamping sheet are alternately stacked and pressed, the first magnetic flux barrier and the second magnetic flux barrier are aligned along the axial direction, and the first opening and the second magnetic isolation bridge are aligned along the axial direction; the first magnetic isolation bridge and the second opening are aligned along the axial direction.

[0009] The rotor assembly has at least the following beneficial effects: the magnetic flux barriers of the first punching sheet and the second punching sheet are designed with openings, the magnetic circuit at the position is cut off by the openings, the magnetic leakage can be effectively reduced, the Q-axis magnetic resistance is increased, the motor output torque is improved, and the motor working efficiency is improved.

[0010] According to the first aspect, in a possible implementation, the first part and the fourth part are symmetrical about the Q-axis, and the second part and the third part are symmetrical about the Q-axis.

[0011] According to the first aspect, in a possible implementation, the number of the first punching sheet is consistent with that of the second punching sheet.

[0012] According to the first aspect, in a possible implementation, the rotor assembly further comprises a third punching sheet located at at least one end of the rotor assembly, the third punching sheet is laminated with the adjacent first punching sheet or second punching sheet, and the third punching sheet has a third magnetic flux barrier; a projection of the third magnetic flux barrier on the first punching sheet in the axial direction at least coincides with the first part, and a projection of the third magnetic flux barrier on the second punching sheet in the axial direction at least coincides with the fourth part.

[0013] According to the first aspect, in a possible implementation, the first magnetic flux barrier forms a magnetic flux guide channel on both sides in the direction of the Q-axis; at least two first magnetic flux barriers arranged at intervals in the direction of the Q-axis form a first magnetic barrier group, and at least two first magnetic flux barriers close to the rotor shaft center in the same first magnetic barrier group are provided with a connecting rib; the connecting rib connects the magnetic flux guide channels on both sides of the first magnetic flux barrier where the connecting rib is located.

[0014] According to the first aspect, in a possible implementation, the connecting rib is arranged in the direction of the Q-axis, and in two connecting ribs adjacent in the direction of the Q-axis, the width of the connecting rib close to the rotor shaft center is greater than the width of the connecting rib away from the rotor shaft center.

[0015] According to the first aspect, in a possible implementation, the width of the connecting rib close to the outer edge of the rotor assembly is L min , L min ≥0.5mm; and / or;

[0016] The width of the connecting rib close to the rotor shaft center is L max , L max ≤1.0mm.

[0017] According to the first aspect, in a possible implementation manner, an outer diameter of the first punching sheet is R1, and an inner diameter of the first punching sheet is R2; a total thickness of the first flux barriers in the first magnetic barrier group along the Q-axis direction is W;

[0018] wherein 0.5≤W / (R1-R2)≤0.55.

[0019] According to the first aspect, in a possible implementation manner, in the same first magnetic barrier group, the plurality of first flux barriers comprise a first magnetic barrier slot and at least two second magnetic barrier slots.

[0020] The first magnetic barrier slot extends along a direction perpendicular to the Q-axis, and the first magnetic barrier slot is arranged close to an outer side edge of the rotor assembly.

[0021] The second magnetic barrier slot is arranged between the first magnetic barrier slot and a rotor shaft center of the rotor assembly, and the second magnetic barrier slot comprises a first slot body and a second slot body. The first slot body extends along a direction perpendicular to the Q-axis, and the first slot body is internally provided with the connecting rib. The second slot body extends along a direction parallel to a D-axis of the side on which the second slot body is located, and the second slot body is in communication with the first slot body at both ends of the first slot body and is located radially outward of the first slot body.

[0022] According to the first aspect, in a possible implementation manner, in the same first magnetic barrier group, widths of the plurality of first slot bodies sequentially decrease along a direction of the Q-axis away from the rotor shaft center, and the width of each first slot body is greater than the width of the first magnetic barrier slot.

[0023] According to the first aspect, in a possible implementation manner, a width of the first slot body close to the rotor shaft center is W1, a distance between the second slot body close to the D-axis and the D-axis of the side on which the second slot body is located is M1, and 0.7≤2*M1 / W1≤0.8; and / or,

[0024] A width of the first magnetic barrier slot is Wn, a width of the magnetic flux channel located on a side of the first magnetic barrier slot facing the rotor shaft center is Mn, and 0.9≤Mn / Wn≤1.0; and / or,

[0025] A width of the first slot body of the second magnetic barrier slot adjacent to the first magnetic barrier slot is Wn-1, and a width of the magnetic flux channel located on a side of the second magnetic barrier slot facing the rotor shaft center is Mn-1, and 0.6≤Mn-1 / Wn-1≤0.7.

[0026] According to the first aspect, in a possible implementation manner, among the plurality of first magnetic isolation bridges located between the Q-axis and the adjacent D-axis, a thickness of the first magnetic isolation bridge adjacent to the D-axis is greater than a thickness of the first magnetic isolation bridge adjacent to the Q-axis.

[0027] According to the first aspect, in a possible implementation manner, at least the first magnetic barrier slot is filled with a magnetic isolation piece.

[0028] According to the first aspect, in a possible implementation manner, the first magnetic barrier slot further comprises a limiting slot formed on opposite side walls of the second slot body, so that the magnetic isolation piece and the magnetic conduction channel on the side where the limiting slot is located are mutually embedded.

[0029] According to the second aspect, the embodiment of the present application further provides a synchronous reluctance motor, wherein the synchronous reluctance motor comprises the rotor assembly of the first aspect.

[0030] According to the synchronous reluctance motor provided by the embodiment of the present application, at least the following beneficial effects are achieved: by applying the above rotor assembly, the output torque of the synchronous reluctance motor and the motor working efficiency are improved while the structural strength is ensured

[0031] The additional aspects and advantages of the present application will be partially given in the following description, partially will become obvious from the following description, or will be understood through the practice of the present application. BRIEF DESCRIPTION OF DRAWINGS

[0032] The present application will be further described below in combination with the drawings and embodiments, wherein:

[0033] Figure 1 FIG. 1 is a structural schematic view of a rotor assembly in an embodiment of the present application;

[0034] Figure 2 FIG. 2 is a structural comparison schematic view of a first punching sheet and a second punching sheet in an embodiment of the present application;

[0035] Figure 3 FIG. 3 is a structural schematic view of a first punching sheet in an embodiment of the present application;

[0036] Figure 4 FIG. 4 is a size structural schematic view of a first punching sheet in an embodiment of the present application;

[0037] Figure 5 FIG. 5 is a comparison diagram of output torque waveforms in the present application scheme and a traditional scheme;

[0038] Figure 6 FIG. 6 is a comparison diagram of rated power in the present application scheme and a traditional scheme.

[0039] LIST OF REFERENCE NUMERALS

[0040] 100, rotor assembly; 110, first lamination; 111, first flux barrier; 111a, first flux barrier slot; 111b, second flux barrier slot; 1111, first slot body; 1112, second slot body; 112, first flux barrier bridge; 113, first opening; 114, flux guiding channel; 116, connecting web; 120, second lamination; 121, second flux barrier; 122, second flux barrier bridge; 123, second opening; 130, third lamination; 131, third flux barrier; 132, third flux barrier bridge. DETAILED DESCRIPTION

[0041] Embodiments of the present application are described below in detail with reference to the accompanying drawings, wherein the same or similar components are denoted by the same or similar reference numerals throughout the drawings. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to explain the present application, and should not be understood as limiting the present application.

[0042] In the description of the present application, it should be understood that, in relation to the orientation description, for example, the orientation or position relationship indicated by up, down, front, back, left, right, etc. is based on the orientation or position relationship shown in the drawings, and is only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as limiting the present application in that the indicated device or component must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present application.

[0043] In the description of the present application, the meaning of several is more than one, the meaning of multiple is more than two, greater than, less than, more than, etc. are understood as not including the number, above, below, etc. are understood as including the number. If it is described as first, second, etc., it is only for the purpose of distinguishing technical features, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features or the sequence of indicated technical features.

[0044] In the description of the present application, unless otherwise explicitly limited, the words such as setting, installing, connecting, etc. should be interpreted broadly, and the person skilled in the art can reasonably determine the specific meaning of the above words in the present application in combination with the specific content of the technical solution.

[0045] In the description of the present application, the description of the terms "one embodiment", "some embodiments", "exemplary embodiment", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in combination with the embodiment or example are included in at least one embodiment or example of the present application. In the present specification, the exemplary description of the above terms does not necessarily mean the same embodiment or example. Moreover, the described specific features, structures, materials or characteristics can be combined in any one or more embodiments or examples in a suitable manner.

[0046] The synchronous reluctance motor is a kind of motor whose rotor does not need to be excited by a magnetic field, follows the principle of minimum reluctance, and uses a special rotor design to generate a reluctance torque to drive the motor to run. Compared with the induction motor, the synchronous reluctance motor has higher power density and efficiency, a wider constant power speed range, and simple process. Compared with the permanent magnet synchronous motor, the synchronous reluctance motor does not need a permanent magnet, has low cost, does not need to consider demagnetization risk, has high reliability, and has strong environmental adaptability in application scenarios. Therefore, the synchronous reluctance motor is widely used in compressors, household appliances, electric vehicles and many other fields.

[0047] In the related art, the rotor assembly often adopts a multi-layer magnetic barrier structure, and the circumferential magnetic isolation bridge and the radial connecting rib are used 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., a D-axis, and a low-permeability magnetic channel, i.e., a Q-axis. The circumferential magnetic isolation bridge connects the high-permeability magnetic channel to meet a certain mechanical strength. When the permeability of the Q-axis is lower and the permeability of the D-axis is higher, the motor output torque capacity is stronger. Since the high-speed stamping process has a certain limitation on the minimum magnetic isolation bridge thickness of the stamping sheet, it is easy to make the magnetic isolation bridge width too large, increase the Q-axis permeability and reduce the D-axis permeability, thereby reducing the motor output torque.

[0048] Based on this, the application provides a rotor assembly. The rotor assembly is formed by axially stacking a plurality of rotor stamping sheets. As shown in Figure 1 and Figure 2 The plurality of rotor stamping sheets can include a first stamping sheet 110 and a second stamping sheet 120. The rotor assembly 100 can be formed by alternately stacking N1 first stamping sheets 110 and N2 second stamping sheets 120, where N1 and N2 are positive integers, and N1 and N2 can be equal or not equal, which is not limited in the application.

[0049] The first punch sheet 110 has a plurality of first magnetic barrier groups distributed along the axial direction, and each first magnetic barrier group includes at least two first magnetic flux barriers 111 arranged along the Q-axis direction; the first magnetic flux barrier 111 includes a first part and a second part arranged on the two sides of the Q-axis, and the first part and the second part are not two completely separated parts, but only for the purpose of illustrating that the first magnetic barrier 111 has a partial structure on the two sides of the Q-axis. The end of the first part away from the Q-axis and the outer side edge of the first punch sheet 110 form a first magnetic isolation bridge 112, and the end of the second part away from the Q-axis forms a first opening 113 on the outer side edge of the first punch sheet 110; the second punch sheet 120 has a plurality of second magnetic barrier groups distributed along the axial direction, and each second magnetic barrier group includes at least two second magnetic flux barriers 121 arranged along the Q-axis direction; the second magnetic flux barrier 121 includes a third part and a fourth part arranged on the two sides of the Q-axis, and the third part and the fourth part are not two completely separated parts, but only for the purpose of illustrating that the second magnetic barrier 121 has a partial structure on the two sides of the Q-axis. The end of the third part away from the Q-axis forms a second opening 123 on the outer side edge of the second punch sheet 120, and the end of the fourth part away from the Q-axis forms a second magnetic isolation bridge 122 between the outer side edge of the second punch sheet 120; under the same pole, the first magnetic flux barrier 111 and the second magnetic flux barrier 121 are aligned along the axial direction, and the first opening 113 and the second magnetic isolation bridge 122 are aligned along the axial direction; the first magnetic isolation bridge 112 and the second opening 123 are aligned along the axial direction.

[0050] In the embodiment, the magnetic flux barriers of the first punch sheet 110 and the second punch sheet 120 are designed with openings, which can effectively reduce magnetic leakage and increase the Q-axis magnetic resistance, thereby improving the motor output torque and the motor working efficiency. Moreover, the first opening 113 of the first punch sheet 110 and the second opening 123 of the second punch sheet 120 are arranged in axial misalignment, the stress of the magnetic flux channel 114 on the two sides of the first opening 113 of the first punch sheet 110 can be transmitted to the second magnetic isolation bridge 122 of the second punch sheet 120, and the stress of the magnetic flux channel 114 on the two sides of the second opening 123 of the second punch sheet 120 can be transmitted to the first magnetic isolation bridge 112 of the first punch sheet 110, thereby ensuring the structural strength and avoiding deformation of the first punch sheet 110 and the second punch sheet 120 caused by centrifugal force during high-speed rotation.

[0051] The rotor assembly is applied to a synchronous reluctance motor, as shown in Figure 5 The rotor assembly can significantly improve the output torque. The average output torque of the traditional scheme is 0.804 NM, and the average output torque of the scheme of the present application is 0.883 NM, and the torque density is increased by 9.83%. As shown in Figure 6 The rotor assembly can significantly improve the rated efficiency. The rated efficiency of the traditional scheme is 51.5%, and the rated efficiency of the scheme of the present application is 53.9%, and the efficiency is increased by 4.66%.

[0052] In this application, the magnetic flux barrier 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 material. The magnetic flux barrier can form magnetic reluctance on the Q-axis magnetic circuit, thereby reducing the permeability of the Q-axis.

[0053] In some embodiments, the first and fourth parts are symmetrical about the Q-axis, and the second and third parts are symmetrical about the Q-axis. The second lamination 120 can be formed by rotating the first lamination 110 180° along any Q-axis. This means that in actual production, only one type of lamination needs to be manufactured; during assembly, different flux barrier configurations can be achieved simply by changing the assembly direction of the laminations, which improves assembly efficiency and production flexibility. Since only one type of lamination is needed, this design simplifies the production process and reduces inventory management costs.

[0054] Of course, in other embodiments, the first stamp 110 and the second stamp 120 are also manufactured separately, and snap points are formed on the first stamp 110 and the second stamp 120, so that two adjacent first stamps 110, two adjacent second stamps 120, or adjacent first stamps 110 and second stamps 120 can be directly connected by snap points when they are stacked together.

[0055] In some embodiments, the number of first laminations 110 and second laminations 120 is the same for the entire rotor assembly 100, thereby making the distribution of first laminations 110 and second laminations 120 in the rotor assembly 100 more uniform, which helps the rotor assembly 100 maintain force balance during rotational speed and reduces vibration and noise.

[0056] The same number of first lamination 110 and second lamination 120 can optimize the magnetic field distribution on both sides of the Q axis and avoid the uneven distribution of the first magnetic isolation bridge 112 and the second magnetic isolation bridge 122, which would lead to an increase in magnetic leakage on the side with more magnetic isolation bridges.

[0057] In some embodiments, the plurality of rotor laminations include a first lamination 110, a second lamination 120, and a third lamination 130, with N1 first laminations 110 and N2 second laminations 120 alternately stacked. The third lamination 130 can be stacked with either the first lamination 110 located at an end or the second lamination 120 located at an end. The third lamination 130 has a third magnetic flux barrier 131; the axial projection of the third magnetic flux barrier 131 onto the first lamination 110 at least coincides with a first portion, and the axial projection of the third magnetic flux barrier 131 onto the second lamination 120 at least coincides with a fourth portion. That is, the third magnetic flux barrier 131 is a closed magnetic flux barrier, and a third magnetic isolation bridge 132 is formed between both ends of the third magnetic flux barrier 131 and the outer edge of the third lamination 130. Since the outer edge of the third lamination 130 does not have an opening structure, it can provide sufficient mechanical support force for the openings of adjacent first laminations 110 or second laminations 120.

[0058] It should be noted that the third lamination 130 may be provided at only one end of the rotor assembly 100, or the third lamination 130 may be provided at both ends; or multiple third laminations 130 may be evenly distributed along the axial direction in the rotor assembly 100; the number of third laminations 130 located at the ends may be 1, 2, 3 or even more, and this application does not limit this.

[0059] As previously explained, the second lamination 120 can be formed by rotating the first lamination 110 180° along the Q-axis. The following explanation uses the shape of the first lamination 110 as an example. Please refer to [reference needed]. Figure 3 and Figure 4 .

[0060] The first lamination 110 includes multiple first magnetic barrier groups, which should be evenly distributed. Each first magnetic barrier group includes multiple first magnetic flux barriers 111. The multiple first magnetic flux barriers 111 in the same first magnetic barrier group are spaced apart along the Q-axis direction. The first magnetic flux barriers 111 form magnetically conductive channels 114 on both sides along the Q-axis direction. That is, the part of the first lamination 110 corresponding to the part between two adjacent first magnetic flux barriers 111 is the magnetically conductive channel 114. The first lamination 110 is made of a magnetically conductive material, such as silicon steel, so that it has high permeability along the extension direction of the magnetically conductive channel 114. The arrangement of multiple first magnetic flux barriers 111 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.

[0061] Within the same first magnetic barrier group, at least two first magnetic flux barriers 111 near the rotor shaft center O1 are provided with connecting ribs 116. The connecting ribs 116 connect the magnetic conductive channels 114 on both sides of the first magnetic flux barrier 111 where they are located. The connecting ribs 116 can improve the mechanical strength of the entire first lamination 110.

[0062] The connecting ribs 116 are arranged along the Q-axis. In two adjacent connecting ribs 116 along the Q-axis, the width of the connecting rib 116 closer to the rotor shaft center O1 is greater than the width of the connecting rib 116 farther from the rotor shaft center O1. For ease of description, the side closer to the rotor shaft center O1 is defined as the inner side, and the side closer to the outer edge of the rotor assembly 100 is defined as the outer side. This application, by providing the connecting ribs 116 within the first magnetic flux barrier 111, particularly using wider connecting ribs 116 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 116 on the outer side can maintain the low permeability of the Q-axis, thereby enhancing the motor's torque output capability.

[0063] Each first magnetic barrier group typically includes 3 to 5 magnetic flux barriers, but may also include a larger number of first magnetic flux barriers 111; this application does not limit this. In this embodiment, each first magnetic barrier group includes 4 first magnetic flux barriers 111 as an example. The 4 first magnetic flux barriers 111 are defined as magnetic flux barriers A1, A2, A3, and A4 respectively along the direction from the rotor axis O1 to the outer edge. Connecting ribs 116 can be provided in magnetic flux barriers A1 and A2, or in magnetic flux barriers A1, A2, A3, and A4.

[0064] In other words, all first magnetic flux barriers 111 in this application may be provided with connecting ribs 116, or only some of the first magnetic flux barriers 111 may be provided with connecting ribs 116. It should be noted that when only some of the first magnetic flux barriers 111 are provided with connecting ribs 116, the first magnetic flux barriers 111 with connecting ribs 116 are located on the inner side, and the first magnetic flux barriers 111 without connecting ribs 116 are located on the outer side.

[0065] Among them, the width of the connecting rib 116 near the outer edge is L. min L min ≥0.5mm; This ensures that the connecting rib 116 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 116 prevents deformation or damage to the rotor assembly 100 after prolonged operation. The width of the connecting rib 116 near the rotor shaft center O1 is L. max L max ≤1.0mm. Maintain the magnetic barrier effect and avoid excessively wide connecting ribs 116 that would significantly increase the permeability in the Q-axis direction. Also, avoid situations where excessively wide connecting ribs 116 become the main path for magnetic flux, leading to a reduction in the magnetic barrier effect and affecting the motor's torque output capability.

[0066] In this embodiment, the width of the connecting rib 116 is kept within a reasonable size range so that the connecting rib 116 provides a certain structural strength without significantly increasing the magnetic permeability of the Q axis, thereby maintaining the torque output capability of the motor.

[0067] Each first magnetic barrier group includes magnetic flux barriers A1, A2, A3, and A4. A1 Connecting ribs 116 are provided in magnetic flux barriers A1, A2, and A3. The width of the connecting rib 116 in magnetic flux barrier A1 is L1, the width of the connecting rib 116 in magnetic flux barrier A2 is L2, and the width of the connecting rib 116 in magnetic 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.

[0068] The width design of the connecting rib 116 in the first lamination 110 needs to strike a balance between mechanical strength and electromagnetic performance. This is achieved by setting a reasonable L... min and L max By adjusting the values ​​and optimizing the design in conjunction with specific application scenarios and performance requirements, the torque output capability, efficiency, and stability of the motor can be significantly improved.

[0069] In some embodiments, such as Figure 3 and Figure 4 As shown, the total width of the first magnetic barrier group should be 0.5 to 0.55 times the radial thickness of the rotor core, providing sufficient magnetic flux blocking area to optimize the magnetic field distribution, while ensuring that the first lamination 110 has sufficient mechanical strength. Specifically, a suitable width of the first magnetic flux barrier 111 can impede magnetic flux more in the Q-axis direction, effectively reducing the permeability in the Q-axis direction; at the same time, the first lamination 110 can retain sufficient solid structure to give it sufficient mechanical strength to withstand various mechanical stresses during motor operation. Furthermore, the retained solid structure can form a magnetic channel 114, 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.

[0070] Specifically, the first lamination 110 is an overall annular structure, with an outer diameter of R1 and an inner diameter of R2. Therefore, the radial iron thickness of the first lamination 110 is R1-R2. Along the Q-axis away from the rotor axis O1, the widths of the multiple first magnetic flux barriers 111 within the same first magnetic barrier group are W1, W2, ..., W... n-1 W n The width of the first magnetic flux barrier 111 is its dimension along the Q-axis. The total width of multiple first magnetic flux barriers 111 within the same first magnetic flux barrier group along the Q-axis is W. Furthermore, 0.5 ≤ W / (R1-R2) ≤ 0.55.

[0071] Multiple first magnetic flux barriers 111 in the same first magnetic flux barrier group can be divided into magnetic flux barrier a and magnetic flux barrier b according to the shape of the magnetic flux barrier. A first magnetic flux barrier group may include one magnetic flux barrier a and at least two magnetic flux barriers b. In one embodiment, the first magnetic flux barrier group includes one magnetic flux barrier a and three magnetic flux barriers b.

[0072] A magnetic flux barrier a extending in a direction perpendicular to the Q-axis can effectively block the flow of magnetic flux in the Q-axis direction. The magnetic flux barrier a is located near the outer edge and does not have connecting ribs 116 inside, which can prevent the formation of a continuous channel in the Q-axis direction on the first lamination 110. The magnetic flux barrier b is located between the magnetic flux barrier a and the rotor shaft O1. The magnetic flux barrier b includes a first magnetic barrier part and a second magnetic barrier part. The first magnetic barrier part extends in a direction perpendicular to the Q-axis. Similar to the magnetic flux barrier a, the first magnetic barrier part can separate multiple magnetic conductive channels 114 perpendicular to the Q-axis together with the magnetic flux barrier a. The first magnetic barrier part has connecting ribs 116 inside, which can enhance the structural strength. The second magnetic barrier part extends in a direction parallel to the D-axis on its side. The second magnetic barrier part is connected to the first magnetic barrier part at both ends and is located radially outside the first magnetic barrier part. The second magnetic barrier part is parallel to the D-axis, which helps to guide the flow of magnetic flux in the D-axis direction, thereby further optimizing the electromagnetic performance of the motor.

[0073] In other embodiments, the magnetic flux barrier a can have a structure similar to that of the magnetic flux barrier b, that is, the magnetic flux barrier a can also include a first magnetic barrier portion and a second magnetic barrier portion, but the magnetic flux barrier a does not have a connecting rib 116; the magnetic flux barrier a can extend in a direction perpendicular to the Q axis and the connecting rib 116 can be provided in the first magnetic flux expansion; even multiple magnetic flux barriers in the first magnetic barrier group can not have magnetic flux barrier a and can be composed entirely of magnetic flux barrier b; this application does not limit this.

[0074] It should be noted that both ends of the magnetic flux barrier a are closed, while one end of the magnetic flux barrier b is closed and the other end is open. The following description takes the first magnetic flux barrier 111 as an air gap magnetic barrier as an example. Then, the magnetic flux barrier a is the first magnetic barrier groove 111a, the magnetic flux barrier b is the second magnetic barrier groove 111b, the first magnetic barrier part is the first groove 1111, and the second magnetic barrier part is the second groove 1112.

[0075] The width of the first magnetic barrier groove 111a is W n Along the Q-axis away from the rotor shaft center O1, the width of the second magnetic barrier slot 111b is W1 to W... n-1 Among them, W1 to W nThe first and second magnetic barrier slots 111a and 111b are arranged in a decreasing order. Specifically, in the same first magnetic barrier group, the width of each first slot 1111 is greater than the width of the first magnetic barrier slot 111a; and in two adjacent first slots 1111 along the Q-axis, the width of the outer slot 1111 is smaller than the width of the inner slot 1111. The main function of the first and second magnetic barrier slots 111a and 111b 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 first slot 1111 near the rotor shaft center O1 is larger, the reluctance in that region will increase accordingly, which helps to generate a larger reluctance torque during motor operation.

[0076] The width ratio of the first magnetic flux barrier 111 to the inner magnetic conductive channel 114 affects torque performance. By controlling the width ratio of the first magnetic flux barrier 111 to the inner magnetic conductive channel 114 when designing the first lamination 110, sufficient magnetic resistance can be formed in the Q-axis direction while reducing torque pulsation and improving the output torque of the motor.

[0077] In one embodiment, the distance between the second groove 1112, 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 114 formed between the second magnetic barrier groove 111b, which is close to the rotor shaft center O1, and the first magnetic barrier groove 111a are M2, ..., M1, respectively. n-1 M n The magnetic channel 114 is arranged with a uniform width along its extension path, that is, the width of the magnetic channel 114 located on the side of the first magnetic barrier groove 111a 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.

[0078] It should be noted that the specific value of the width ratio between the first magnetic flux barrier 111 and its inner magnetic channel 114 is not absolute, but needs to be adjusted according to the specific design goals, working environment, and performance requirements of the motor. In actual design, it may be necessary to determine the optimal width ratio combination through simulation analysis, experimental verification, and other means.

[0079] In a specific example of this application, the first magnetic barrier group includes one first magnetic barrier slot 111a and three second magnetic barrier slots 111b, 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.

[0080] A first magnetic barrier bridge 112 is formed between the two ends of the first magnetic barrier groove 111a and the outer edge. One end of the second magnetic barrier groove 111b has an opening on the outer edge, and the other end forms a first magnetic barrier bridge 112 with the outer edge. Among the multiple first magnetic flux barriers 111 in the same first magnetic barrier group, at least the thickness of the first magnetic barrier bridge 112 adjacent to the D-axis is greater than the thickness of the first magnetic barrier bridge 112 adjacent to the Q-axis. This application specifically increases the width of the first magnetic barrier bridge 112 near the D-axis to match the stress magnitude of each first magnetic barrier bridge 112, thereby meeting the mechanical strength requirements of the first lamination 110.

[0081] In the same first magnetic barrier group, among the first magnetic flux barriers 111 whose ends and outer edges form first magnetic isolation bridges 112, along the direction away from the rotor axis O1 along the Q axis, the widths of the multiple first magnetic isolation bridges 112 are B1, B2, ..., B... n-1 B n Among the multiple first magnetic isolation bridges 112 located between the Q-axis and the adjacent D-axis, B1≥B2≥…≥B n-1 ≥B n And B1 > B n .

[0082] In a specific example of this application, B1 = 1, B2 = 1, B3 = 0.8, and B4 = 0.8.

[0083] In other embodiments, among the first magnetic flux barriers 111 in the same first magnetic barrier group, the width of the first magnetic flux barrier 112 formed between the end and the outer edge increases along the direction away from the Q axis.

[0084] It is important to note that the width of the first magnetic isolation bridge 112 not only affects the mechanical strength of the first lamination 110, but the ratio of the width of the first magnetic isolation bridge 112 to the width of the second slot 1112 also affects the leakage flux of the first lamination 110, thus affecting the torque output capability. By controlling the ratio of the width of the first magnetic isolation bridge 112 to the width of its corresponding second slot 1112 when designing the first lamination 110, the output torque can be maximized while meeting the mechanical strength requirements.

[0085] In one embodiment, within the same first magnetic barrier group, along the direction away from the rotor axis O1 along the Q axis, the widths of the second groove bodies 1112 of the plurality of second magnetic barrier grooves 111b 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 =Bn .

[0086] The specific value of the ratio between the width of the first magnetic bridge 112 and the width of the second groove 1112 of the corresponding second magnetic barrier groove 111b 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.

[0087] When the first magnetic flux barrier 111 adopts an air gap magnetic barrier, different magnetic conduction channels 114 are separated by the special structural shape and position of the first magnetic barrier groove 111a and the second magnetic barrier groove 111b, thereby guiding the magnetic flux to flow along a predetermined path.

[0088] The design of the air gap magnetic barrier is relatively simple, does not require additional non-magnetic materials, and can be formed by stamping in one step.

[0089] For ease of description, the first magnetic barrier slot 111a and the second magnetic barrier slot 111b are collectively referred to as magnetic barrier slots. The edges of the magnetic barrier slots can be chamfered to reduce stress concentration at the edges and improve the overall mechanical strength of the rotor core. Specifically, the apex corners of each magnetic barrier slot can be rounded, and one end of the magnetic barrier slot can be set as an arc segment concentric with the outer edge of the rotor core.

[0090] The magnetic flux barrier can also be made of non-magnetic material. Specifically, when the first lamination 110 has an axially penetrating magnetic barrier groove, a magnetic shielding element is filled in the magnetic barrier groove. The magnetic shielding element is a solid structure, which can also block the direct propagation path of magnetic flux at the magnetic barrier groove, thereby increasing the magnetic resistance along the Q axis and guiding the magnetic flux to flow along a predetermined path.

[0091] Magnetic shielding components are made of non-magnetic materials, such as plastics, ceramics, or polymer composites. These materials have very low magnetic permeability, thus effectively blocking magnetic fields.

[0092] The magnetic shielding component can be connected to the inner wall of the magnetic barrier groove 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, but also helps to improve the overall structural strength of the rotor assembly 100.

[0093] The magnetic shielding component can be formed by injection molding. The injection molding material can be PBT (polybutylene terephthalate), PBT+glass fiber (glass fiber reinforced polybutylene terephthalate), PA (polyamide), etc. The magnetic shielding component is connected to the first lamination 110 to form a whole by injection molding, thereby improving the overall structural strength of the rotor assembly 100 and avoiding the problem of breakage caused by the large stress of the magnetic bridge under centrifugal force when the rotor assembly 100 rotates at high speed.

[0094] Based on the above example, limiting grooves can be formed on the opposite side walls of the second groove 1112. The magnetic shielding component corresponding to the limiting groove has toothed protrusions, which are fitted into the limiting grooves one-to-one. The main function of the limiting groove is to make the magnetic shielding component fit into the magnetic channel 114 on the side where the limiting groove is located, thereby increasing the connection strength and stability between the magnetic shielding component and the first lamination 110, and making the magnetic shielding component less likely to fall off or loosen when the rotor assembly 100 rotates at high speed.

[0095] Furthermore, since the first groove 1111 is perpendicular to the Q-axis, when the rotor assembly 100 rotates at high speed, the magnetic channel 114 has sufficient strength to support and limit the magnetic shielding component within the first groove 1111. The second groove 1112 is parallel to the D-axis, and limiting grooves are formed on the opposite side walls of the second groove 1112. Because the portion of the magnetic shielding component located within the second groove 1112 is parallel to the D-axis, when the rotor assembly 100 rotates at high speed, the magnetic shielding component is subjected to centrifugal force, tending to squeeze the magnetic bridge or detach. By providing limiting grooves on the side walls of the second groove 1112, the deformation and displacement of the magnetic shielding component along the D-axis direction can be limited, thereby avoiding squeezing the magnetic bridge, allowing for a smaller width of the magnetic bridge, reducing magnetic leakage, and preventing the magnetic shielding component from detaching.

[0096] In a preferred embodiment, the limiting grooves located on both sides of the same magnetic channel 114 are staggered. The staggered limiting grooves can avoid the formation of continuous slits, thereby reducing the risk of saturation of the magnetic channel 114, helping to maintain high permeability along the D-axis direction, and ensuring the magnetic flux efficiency of the motor.

[0097] Specifically, the shape of the limiting slot can be regular or irregular, such as arc, rectangle, or dovetail. Without causing rotor core saturation or affecting motor performance, the more limiting slots there are and the larger their area, the higher the mechanical strength of the rotor assembly 100.

[0098] The rotor assembly 100 also includes a rotor shaft. A first lamination 110 has a shaft hole. When the first lamination 110 and the second lamination 120 are stacked, the shaft holes of the first lamination 110 and the second lamination 120 are aligned to allow the rotor shaft to pass through. By injection molding a filling portion within the shaft hole, the rotor shaft can be securely connected to the first lamination 110 and the second lamination 120 to form a single integral structure. This connection method not only simplifies the assembly process but also improves the overall rigidity and durability of the rotor assembly 100.

[0099] The first lamination 110 has multiple injection grooves designed on the edge of the shaft hole. During the injection molding process, the filling part fills these injection grooves and forms radial protrusions after cooling and solidification. These radial protrusions fit tightly with the injection grooves, increasing the contact area between the rotor shaft and the first lamination 110 and the second lamination 120, thereby improving the efficiency of torque transmission.

[0100] like Figure 2 As shown, the structure of the second lamination 120 is symmetrical to the structure of the first lamination 110 about the Q-axis. For ease of description, the third lamination 130 can be divided into two half-regions, one half of which is completely identical to the part of the first lamination 110 corresponding to the first magnetic isolation bridge 112, and the two half-regions of the third lamination 130 are symmetrical about the Q-axis. Therefore, given the description of the structure of the first lamination 110, the structures of the second lamination 120 and the third lamination 130 can be clearly understood, and will not be described in detail here.

[0101] Furthermore, this application also proposes a synchronous reluctance motor, which 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 of this utility model embodiment has the same technical effects as the rotor assembly 100 in the above embodiments, and will not be repeated here.

[0102] Synchronous reluctance motors typically also include stator assemblies, motor housings, and other components, which will not be described in detail in this application.

[0103] 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, include: The first lamination has at least two first magnetic flux barriers spaced apart along the Q-axis direction; the first magnetic flux barrier includes a first part and a second part disposed on both sides of the Q-axis, the end of the first part away from the Q-axis forming a first magnetic isolation bridge between it and the outer edge of the first lamination, and the end of the second part away from the Q-axis forming a first opening on the outer edge of the first lamination. The second lamination has at least two second magnetic flux barriers spaced apart along the Q-axis direction; the second magnetic flux barriers include a third part and a fourth part respectively disposed on both sides of the Q-axis, the end of the third part away from the Q-axis forming a second opening on the outer edge of the second lamination, and the end of the fourth part away from the Q-axis forming a second magnetic isolation bridge between the outer edge of the second lamination and the outer edge of the second lamination. At least one first lamination and at least one second lamination are alternately stacked, the first magnetic flux barrier and the second magnetic flux barrier are aligned axially, and the first opening and the second magnetic isolation bridge are aligned axially; the first magnetic isolation bridge and the second opening are aligned axially.

2. The rotor assembly according to claim 1, characterized in that, The first part and the fourth part are symmetrical about the Q-axis, and the second part and the third part are symmetrical about the Q-axis.

3. The rotor assembly according to claim 1 or 2, characterized in that, The number of the first lamination and the number of the second lamination are the same.

4. The rotor assembly according to claim 1 or 2, characterized in that, The rotor assembly further includes a third lamination located at at least one end of the rotor assembly, the third lamination being stacked with an adjacent first lamination or second lamination, and the third lamination having a third magnetic flux barrier; The projection of the third magnetic flux barrier along the axial direction onto the first lamination coincides at least with the first part, and the projection of the third magnetic flux barrier along the axial direction onto the second lamination coincides at least with the fourth part.

5. The rotor assembly according to claim 1, characterized in that, The first magnetic flux barrier forms magnetic conductive channels on both sides along the Q-axis direction; at least two first magnetic flux barriers spaced apart along the Q-axis direction form a first magnetic barrier group. In the same first magnetic barrier group, at least two first magnetic flux barriers close to the rotor shaft of the rotor assembly are provided with connecting ribs, and the connecting ribs connect the magnetic conductive channels on both sides of the first magnetic flux barrier where they are located.

6. The rotor assembly according to claim 5, characterized in that, The connecting ribs are arranged along the Q-axis direction. Among two adjacent connecting ribs along the Q-axis direction, the width of the connecting rib closer to the rotor shaft center is greater than the width of the connecting rib farther away from the rotor shaft center.

7. The rotor assembly according to claim 5, characterized in that, The width of the connecting rib near the outer edge of the rotor assembly is L. min L min ≥0.5mm; and / or; The width of the connecting rib near the rotor shaft center is L. max L max ≤1.0mm.

8. The rotor assembly according to claim 5, characterized in that, The outer diameter of the first lamination is R1, and the inner diameter of the first lamination is R2; the total thickness of the first magnetic flux barrier in the first magnetic barrier group along the Q-axis is W. Wherein, 0.5≤W / (R1-R2)≤0.

55.

9. The rotor assembly according to claim 5, characterized in that, In the same first magnetic barrier group, multiple first magnetic flux barriers include a first magnetic barrier slot and at least two second magnetic barrier slots; The first magnetic barrier groove extends in a direction perpendicular to the Q-axis and is located near the outer edge of the rotor assembly. The second magnetic barrier groove is disposed between the first magnetic barrier groove and the rotor shaft of the rotor assembly. The second magnetic barrier groove includes a first groove body and a second groove body. The first groove body extends in a direction perpendicular to the Q axis and is provided with the connecting rib. The second groove body extends in a direction parallel to the D axis on its side. The second groove body communicates with the first groove body at both ends and is located radially outside the first groove body.

10. The rotor assembly according to claim 9, characterized in that, In the same first magnetic barrier group, the width of multiple first slots decreases sequentially along the Q-axis away from the rotor axis, and the width of each first slot is greater than the width of the first magnetic barrier slot.

11. The rotor assembly according to claim 9, characterized in that, The width of the first slot near the rotor shaft center is W1, and the distance between the second slot near the D-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 barrier groove is W n The width of the magnetically conductive channel located on the side of the first magnetic barrier groove facing the rotor shaft is M. n 0.9≤M n / W n ≤1.0; and / or, The width of the first groove body of the second magnetic barrier groove adjacent to the first magnetic barrier groove is W. n-1 The width of the magnetic channel located on the side of the second magnetic barrier groove facing the rotor shaft is M. n-1 0.6≤M n-1 / W n-1 ≤0.

7.

12. The rotor assembly according to claim 9, characterized in that, Among the multiple first magnetic isolation bridges located between the Q-axis and the adjacent D-axis, at least the thickness of the first magnetic isolation bridge adjacent to the D-axis is greater than the thickness of the first magnetic isolation bridge adjacent to the Q-axis.

13. The rotor assembly according to any one of claims 9 to 12, characterized in that, At least the first magnetic barrier groove is filled with a magnetic shielding component.

14. The rotor assembly according to claim 13, characterized in that, The first magnetic barrier groove also includes a limiting groove, which is formed on the opposite side walls of the second groove body so that the magnetic shielding member and the magnetic channel on the side where the limiting groove is located can be fitted together.

15. A synchronous reluctance motor, characterized in that, Includes the rotor assembly as described in any one of claims 1 to 14.

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