Rotor and electric motor comprising same
The rotor design with offset flux barrier structures and increased contact area addresses the loosening issue, ensuring stable high-speed operation by enhancing the binding force between laminations and permanent magnetic material.
Patent Information
- Authority / Receiving Office
- WO · WO
- Patent Type
- Applications
- Current Assignee / Owner
- SCHAEFFLER TECHNOLOGIES AG & CO KG
- Filing Date
- 2025-12-04
- Publication Date
- 2026-07-23
AI Technical Summary
The existing permanent magnet synchronous motors suffer from loosening between rotor laminations and permanent magnetic materials during high-speed operation, leading to instability and reduced mechanical strength, which affects the motor's performance.
A rotor design comprising stacked first and second lamination sets with offset flux barrier structures and protrusions or recesses that increase the contact area between the permanent magnetic material and laminations, enhancing the binding force against centrifugal forces.
The design ensures stable high-speed operation of the rotor for extended periods by increasing the mechanical strength and binding force between the laminations and permanent magnetic material.
Smart Images
Figure EP2025085501_23072026_PF_FP_ABST
Abstract
Description
[0001] Rotor and electric motor comprising same
[0002] Technical Field
[0003] The present invention relates to the technical field of electric motors, in particular to a rotor and an electric motor comprising the rotor.
[0004] Background Art
[0005] As new energy vehicles develop, ever higher requirements are being placed on the performance of the drive motor. Permanent magnet synchronous motors are being used ever more widely on account of their advantages such as high efficiency, good dynamic response and low noise.
[0006] In permanent magnet synchronous motors in the prior art, the rotor is typically formed by pressing laminations. Each lamination is provided with a through-hole, so that after pressing, the through-holes can be connected so as to jointly define a through-slot. A magnetism-assisting material (such as a permanent magnetic material) can then be inserted in the through-slot by injection moulding. The state of contact between the rotor lamination and the injection-moulded magnetismassisting material will affect the mechanical strength and maximum rotation speed of the rotor during operation. In a known rotor structure in the prior art, loosening occurs very easily between the rotor lamination and the permanent magnetic material during operation, especially high-speed rotation of the rotor. Stable operation of the rotor at high speed for a long period of time is thus not possible, so the overall performance of the permanent magnet synchronous motor is adversely affected.
[0007] Summary of the Invention
[0008] An objective of the present invention is to solve at least one of the abovementioned problems in the prior art and / or other problems.
[0009] To achieve this objective, according to one aspect of the present invention, it provides a rotor, comprising at least one first lamination set and at least one second lamination set stacked on each other, the first lamination set being formed bystacking at least one first-type lamination, and the second lamination set being formed by stacking at least one second-type lamination; the first-type lamination has multiple first flux barrier structures spaced apart in a circumferential direction thereof, each first flux barrier structure comprising multiple first flux barrier layers spaced apart from one another in a radial direction, and each first flux barrier layer comprising multiple first flux bridges and multiple first voids bridge-connected to each other by means of the multiple first flux bridges; the second-type lamination has multiple second flux barrier structures spaced apart in a circumferential direction thereof, each second flux barrier structure comprising multiple second flux barrier layers spaced apart from one another in a radial direction, and each second flux barrier layer comprising multiple second flux bridges and multiple second voids bridge-connected to each other by means of the multiple second flux bridges; wherein, when the at least one first lamination set and the at least one second lamination set are stacked on each other, the first voids in the first lamination set are aligned with the corresponding second voids in the second lamination set to form flux barrier slots of the rotor; wherein each first flux barrier layer is provided with a first structure in at least one first void, the first structure extending in such a way as to deviate from a main body extension direction of at least one edge defining the first void; each second flux barrier layer is provided with a second structure in at least one second void, the second structure extending in such a way as to deviate from a main body extension direction of at least one edge defining the second void; and the flux barrier slot provided with the first structure and the second structure in the rotor is filled with a permanent magnetic material; wherein, when the at least one first lamination set and the at least one second lamination set are stacked on each other, the first structure in each first flux barrier layer in the first lamination set is offset with respect to the second structure in the second flux barrier layer, aligned with the first flux barrier layer, in the second lamination set.
[0010] According to an embodiment of the present invention, each first flux barrier layer forms an arch shape or arc shape which is arched away from an outer peripheral edge of the first-type lamination toward the center of the first-type lamination, and / or each second flux barrier layer forms an arch shape or arc shape which is arched away from an outer peripheral edge of the second-type lamination toward the center of the second-type lamination.According to an embodiment of the present invention, the first structure comprises at least one first protrusion projecting into the first void from a first edge of the first void and / or at least one second protrusion projecting into the first void from a second edge of the first void, the first edge and second edge of the first void being opposite each other.
[0011] According to an embodiment of the present invention, the second structure comprises at least one third protrusion projecting into the second void from a first edge of the second void and / or at least one fourth protrusion projecting into the second void from a second edge of the second void, the first edge and second edge of the second void being opposite each other, wherein the first protrusion and the third protrusion are offset with respect to each other, and the second protrusion and the fourth protrusion are offset with respect to each other.
[0012] According to an embodiment of the present invention, the first structure comprises at least one first recess sunk into lamination material surrounding the first void from a first edge of the first void and / or at least one second recess sunk into lamination material surrounding the first void from a second edge of the first void, the first edge and second edge of the first void being opposite each other.
[0013] According to an embodiment of the present invention, the second structure comprises at least one third recess sunk into lamination material surrounding the second void from a first edge of the second void and / or at least one fourth recess sunk into lamination material surrounding the second void from a second edge of the second void, the first edge and second edge of the second void being opposite each other, wherein the first recess and the third recess are offset with respect to each other, and the second recess and the fourth recess are offset with respect to each other.
[0014] According to an embodiment of the present invention, the multiple first voids comprised in each first flux barrier layer are distributed symmetrically with respect to a first central axis of the first flux barrier layer, wherein one first void is arranged on the first central axis; and two first voids directly adjacent to the first void arranged on the first central axis are each provided with the first structure; the multiple second voids comprised in each second flux barrier layer are distributed symmetrically withrespect to a second central axis of the second flux barrier layer, wherein one second void is arranged on the second central axis; and two second voids directly adjacent to the second void arranged on the second central axis are each provided with the second structure.
[0015] According to an embodiment of the present invention, the first flux barrier structure comprises three first flux barrier layers spaced apart from one another in a radial direction; the three first flux barrier layers are respectively defined as a first outside flux barrier layer, a first middle flux barrier layer and a first inside flux barrier layer, from the outside to the inside in a radial direction of the first-type lamination; the first voids in the first outside flux barrier layer, the first middle flux barrier layer and the first inside flux barrier layer that are close to the outer peripheral edge of the first-type lamination are respectively defined as first outer layer extremity voids, first middle layer extremity voids and first inner layer extremity voids; each extremity void has two void edges extending transversely with respect to an approximate extension direction of the corresponding first flux barrier layer, the two void edges comprising an outer void edge closer to the outer peripheral edge of the first-type lamination and an inner void edge further away from this outer peripheral edge, wherein distances from midpoints of the respective inner void edges of the first outer layer extremity void, the first middle layer extremity void and the first inner layer extremity void among the three extremity voids on either side of the first central axis to the center of the first-type lamination are respectively L1 , L2 and L3, wherein L3 < L1 < L2; the second flux barrier structure comprises three second flux barrier layers spaced apart from one another in a radial direction, and extremity voids in the second flux barrier layers are configured in the same manner as the extremity voids in the first flux barrier layers.
[0016] According to an embodiment of the present invention, the rotor is formed of only one first lamination set and only one second lamination set which are stacked one on top of another; or formed of multiple first lamination sets and multiple second lamination sets which are stacked alternately.
[0017] According to another aspect of the present invention, it provides an electric motor, comprising the rotor described above.The rotor according to the present invention is formed by stacking the first-type lamination and the second-type lamination, and the first and second structures offset with respect to one another that are provided in the flux barrier layers of the laminations of different types increase the surface of contact between the permanent magnetic material filling the flux barrier slots that are formed and the rotor laminations, increasing the resistance of the permanent magnetic material to centrifugal force, and thereby increasing the force binding the first lamination set and the second lamination set to the permanent magnetic material, to ensure that the rotor is able to operate stably at high speed for a long period of time.
[0018] Brief Description of the Drawings
[0019] The features and advantages of the present invention will be clearly understood by means of the following detailed description provided with reference to the drawings. It should be understood that the drawings listed below are merely schematic and not necessarily drawn to scale, so should not be regarded as limiting the present invention, wherein:
[0020] Fig. 1 shows a sectional schematic drawing of an electric motor comprising a rotor according to embodiments of the present invention.
[0021] Fig. 2 shows an exploded drawing of laminations of the rotor shown in Fig. 1, combined in a first way.
[0022] Fig. 3 shows an exploded drawing of a first lamination set of the rotor shown in Fig. 2.
[0023] Fig. 4 shows an exploded drawing of laminations of the rotor shown in Fig. 1, combined in a second way.
[0024] Fig. 5 shows an exploded drawing of laminations of the rotor shown in Fig. 1, combined in a third way.
[0025] Fig. 6 shows a schematic drawing of a first-type lamination of a rotor according to an embodiment of the present invention, wherein a first protrusion and a second protrusion are provided in a flux barrier structure of the first-type lamination.Fig. 7 shows a schematic drawing of a second-type lamination of a rotor according to an embodiment of the present invention, wherein a third protrusion and a fourth protrusion are provided in a flux barrier structure of the second-type lamination.
[0026] Fig. 8 shows a schematic drawing of a first-type lamination of a rotor according to another embodiment of the present invention, wherein a first recess and a second recess are provided in a flux barrier structure of the first-type lamination.
[0027] Fig. 9 shows a schematic drawing of a second-type lamination of a rotor according to another embodiment of the present invention, wherein a third recess and a fourth recess are provided in a flux barrier structure of the second-type lamination.
[0028] Detailed Description of the Invention
[0029] Embodiments of the present invention are described below with reference to the drawings. Many specific details are expounded in the following description so that those skilled in the art can understand and realize the present invention more comprehensively. However, it is obvious to those skilled in the art that the invention can be realized without some of these specific details. In addition, it should be understood that the present invention is not limited to the specific embodiments described. On the contrary, consideration may be given to the use of any combination of the following various features and key elements to implement the present invention, regardless of whether they relate to different embodiments. Therefore, the following aspects, features, embodiments and advantages merely serve an explanatory purpose, and should not be regarded as key elements or definitions of the claims, unless explicitly stated in the claims.
[0030] Hereinafter, terms such as “first” and “second" are used to describe elements of the present application; these terms are only used for distinguishing various elements, rather than for imposing a restriction on the nature, order or number of these elements. The terms “comprise” and “have” are used to express the meaning of being included in an open way, and mean that other key elements / constituents may also be present in addition to the key elements / constituents listed.Fig. 1 shows a schematic drawing of an electric motor, which comprises a rotor according to an embodiment of the present invention. As shown in Fig. 1 , the electric motor may comprise a rotor assembly and a stator assembly. The rotor assembly may comprise a rotor 100, the rotor 100 having multiple flux barrier slot sets spaced apart in a circumferential direction thereof. Each flux barrier slot set may comprise multiple flux barrier slots 101 spaced apart in a radial direction of the rotor 100. These flux barrier slots 101 substantially form an arch shape or arc shape which is arched away from an outer peripheral edge of the rotor 100 toward the center of the rotor. These flux barrier slots 101 may be a single, whole arc-shaped void, or be formed of multiple arc-shaped voids spaced apart. The stator assembly may comprise a stator core 200 and stator windings 300. The stator core 200 is arranged at an outer periphery of the rotor 100, and provided with multiple stator slots at equal intervals in a circumferential direction thereof. The stator windings 300 are installed in corresponding stator slots.
[0031] The rotor according to embodiments of the present invention may comprise at least one first lamination set 1 and at least one second lamination set 2, which are stacked on each other. Each first lamination set 1 may be formed by stacking at least one first-type lamination 3. Each second lamination set 2 may be formed by stacking at least one second-type lamination 4.
[0032] In an exemplary stacking arrangement, Fig. 2 shows three first lamination sets 1 and four second lamination sets 2 stacked alternately on each other to form the rotor; each first lamination set 1 for example comprises ten first-type laminations 3 as shown in Fig. 3, and each corresponding second lamination set 2 may also comprise multiple second-type laminations 4. Unlike the embodiment in Figs. 2 and 3, the first lamination set 1 and the second lamination set 2 in Fig. 4 are respectively formed of only one first-type lamination 3 and only one second-type lamination 4; thus, the first lamination set 1 formed of the single first-type lamination and the second lamination set 2 formed of the single second-type lamination are stacked alternately with each other to form the rotor.
[0033] Furthermore, Fig. 5 shows another exemplary stacking arrangement, wherein the rotor comprises only one first lamination set 1 and only one second lamination set 2, wherein the first lamination set 1 is formed by stacking multiple first-typelaminations 3, and the second lamination set 2 is formed by stacking multiple second-type laminations 4. Of course, other stacking arrangements are also possible, as long as they are able to realize the function to be realized herein.
[0034] The specific structure of each type of lamination will now be explained with reference to Figs. 6 - 9.
[0035] Fig. 6 shows the specific structure of the first-type lamination 3 of a rotor according to a first embodiment of the present invention. As shown in Fig. 6, the first-type lamination 3 has multiple first flux barrier structures spaced apart in a circumferential direction. Each first flux barrier structure may comprise multiple first flux barrier layers 31 spaced apart from one another in a radial direction of the first-type lamination 3. Each first flux barrier layer 31 may comprise multiple first flux bridges 32 and multiple first voids 33. The multiple first flux bridges 32 and multiple first voids 33 are spaced apart from one another, such that two adjacent first voids 33 can be bridge-connected to each other by a first flux bridge 32. Each first void 33 has at least one edge capable of defining the first void 33; the number of edges depends on the shape of the first void 33. For example, the first void 33 in Fig. 6 is substantially quadrilateral, and thus has four edges, each edge being defined with an edge main body extension direction, this direction being set to be an approximate extension direction of a main portion (i.e. ignoring protruding or recessed structural features in local regions) of the edge. For example, as shown in Fig. 6, the approximate extension direction of an edge A of one of the first voids is direction B shown in Fig. 6.
[0036] Each first flux barrier layer 31 is provided with a first structure in at least one first void 33, the first structure extending in such a way as to deviate from the main body extension direction of at least one edge defining the first void. That is to say, the first structure may deviate toward the inside of the first void 33 and / or the outside of the first void 33, relative to the main body extension direction of the edge on which it is located.
[0037] In this embodiment, the first-type lamination 3 has eight first flux barrier structures spaced apart in the circumferential direction; of course, four, six or ten, etc. could also be provided, depending on actual needs. Each first flux barrier structure hasthree first flux barrier layers 31 , spaced apart from one another in a radial direction of the first-type lamination 3.
[0038] Optionally, each first flux barrier layer 31 on the first-type lamination 3 forms an arch shape or arc shape which is arched away from an outer peripheral edge of the first-type lamination 3 toward the center 0 of the first-type lamination 3. Preferably, each first flux barrier structure or first flux barrier layer has a first central axis X extending in a radial direction of the first-type lamination, and forms a symmetric structure with respect to the first central axis X.
[0039] Each first flux barrier layer 31 may comprise multiple, for example six first flux bridges 32, and multiple, for example five first voids 33. These five first voids 33 are distributed symmetrically with respect to the first central axis X; the first void 33 located in the middle of the first flux barrier layer 31 is arranged on the first central axis and has a small area; the two first voids 33 located at two ends of the first flux barrier layer 31 are also relatively small in area; the remaining two first voids 33 (i.e. the two first voids 33 located at two sides of the middle first void 33) are substantially in the form of long arcs and larger in area.
[0040] Continuing to refer to Fig. 6, each first void 33 may comprise a first edge and a second edge which are arc-shaped and arranged opposite one another; the first structure may comprise at least one first protrusion 34 and / or at least one second protrusion 35. The first protrusion 34 projects into the first void 33 from the first edge of the first void 33; the second protrusion 35 projects into the first void 33 from the second edge of the first void 33. Typically, the first void provided with the protrusion structure may be filled with a permanent magnetic material. The protrusion structures can greatly increase the binding force of the permanent magnetic material in the void. In the specific embodiment shown in Fig. 6, the remaining two first voids 33 of larger area may be filled with a permanent magnetic material; thus, the first structures may be provided in these two first voids 33. Of course, of a permanent magnetic material is provided in another void, it is also feasible to provide the first structure in the corresponding other first void, in order to increase the binding force of the permanent magnetic material.
[0041] Fig. 7 shows the specific structure of the second-type lamination 4, which can bematched with the first-type lamination 3 shown in Fig. 6, of the rotor according to the first embodiment of the present invention. As shown in Fig. 7, the second-type lamination 4 has eight second flux barrier structures spaced apart in the circumferential direction. Each second flux barrier structure may comprise three second flux barrier layers 41 spaced apart from one another in a radial direction of the second-type lamination 4. Each second flux barrier layer 41 on the second-type lamination 4 forms an arch shape or arc shape which is arched away from an outer peripheral edge of the second-type lamination 4 toward the center O' of the second-type lamination 4. Each second flux barrier structure or each second flux barrier layer has a second central axis X' extending in a radial direction of the second-type lamination, and forms a symmetric structure with respect to the second central axis.
[0042] Each second flux barrier layer 41 may comprise multiple, for example six second flux bridges 42, and multiple, for example five second voids 43. These five second voids 43 are distributed symmetrically with respect to the second central axis X', and the structure of the second flux barrier layer 41 is essentially the same as the structure of the first flux barrier layer 31 , so that when the first-type lamination 3 and the second-type lamination 4 are stacked, the second flux bridges 42 coincide with the first flux bridges 32, and the second voids 43 coincide with the first voids 33, to form the flux barrier slots 101 of the rotor 100 shown in Fig. 1. Furthermore, second structures may be provided in the two second voids 43 corresponding to the two first voids 33 provided with the first structures.
[0043] Continuing to refer to Fig. 7, these two second voids 43 (i.e. the two second voids 43 located at two sides of the middle second void 43) may each comprise a first edge and a second edge, which are both arc-shaped and arranged opposite one another. Each second structure may comprise at least one third protrusion 44 and / or at least one fourth protrusion 45. The third protrusion 44 projects into the second void 43 from the first edge of the second void 43; the fourth protrusion 45 projects into the second void 43 from the second edge of the second void 43.
[0044] Optionally, the third protrusion 44 of the second void 43 and the first protrusion 34 of the first void 33 are offset with respect to one another, and the fourth protrusion 45 of the second void 43 and the second protrusion 35 of the first void 33 are offset with respect to one another, so that when the first-type lamination 3 and the second-type lamination 4 are stacked, the protrusions extend into the flux barrier slot alternately. Thus, once the permanent magnetic material has been injection-moulded in the flux barrier slot, the protrusions can increase the area of contact between the permanent magnetic material and the rotor lamination, increasing the resistance to centrifugal force, and thereby improving the binding force between the rotor lamination and the injection-moulded material during high-speed rotation and at high temperatures to the greatest extent possible, such that the rotor has greater mechanical strength and is able to operate stably at a high rotation speed for a long period of time.
[0045] Figs. 8 and 9 further show the first-type lamination 3 and the second-type lamination 4, which can be matched for use, of a rotor according to a second embodiment of the present invention. The configuration of the first flux barrier layers 31 , the first flux bridges 32 and the first voids 33 of the first-type lamination 3 shown in Fig. 8 is the same as the configuration in the first-type lamination 3 shown in Fig. 6, and is not described again here. The difference is that the first structure comprises at least one first recess 36 and / or at least one second recess 37, arranged in the two first voids 33 of larger area, for example. The first recess 36 is sunk into the lamination material surrounding the first void 33 from the first edge of the first void 33; the second recess 37 is sunk into the lamination material surrounding the first void 33 from the second edge of the first void 33.
[0046] The configuration of the second flux barrier layers 41 , the second flux bridges 42 and the second voids 43 of the second-type lamination 4 shown in Fig. 9 is the same as the configuration of the second-type lamination 4 shown in Fig. 7, and is not described again here. The difference is that the second structure comprises at least one third recess 46 and / or at least one fourth recess 47, arranged in the two second voids 43 of larger area, for example. The third recess 46 is sunk into the lamination material surrounding the second void 43 from the first edge of the second void 43; the fourth recess 47 is sunk into the lamination material surrounding the second void 43 from the second edge of the second void 43.
[0047] The third recess 46 of the second void 43 and the first recess 36 of the first void 33 are offset with respect to one another, and the fourth recess 47 of the second void 43 and the second recess 37 of the first void 33 are offset with respect to oneanother, so that when the first-type lamination 3 and the second-type lamination 4 are stacked, the recesses are sunk into the lamination material around the flux barrier slot alternately. Similarly, once the permanent magnetic material has been injection-moulded in the flux barrier slot, the recess structures can increase the area of contact between the permanent magnetic material and the lamination, increasing the resistance to centrifugal force, and thereby improving the binding force between the lamination and the injection-moulded material during high-speed rotation and at high temperatures to the greatest extent possible, such that the rotor has greater mechanical strength and is able to operate stably at a high rotation speed for a long period of time.
[0048] The embodiments above only show the case where the first structure and the second structure each only comprise a structure of a single type; for example, the first structure or second structure comprises solely protrusions or recesses. Of course, other possible embodiments are also feasible, as long as these structures can increase the area of contact between the lamination material and the permanent magnetic material filling the corresponding voids, and thereby increase the binding force of the permanent magnetic material. For example, in other embodiments, when the first structure of the first-type lamination 3 comprises a protrusion, the second structure of the second-type lamination 4 may comprise a recess. Thus, the protrusion of the first structure and the recess of the second structure may also be aligned or offset.
[0049] Still referring to Figs. 8 and 9, the three first flux barrier layers 31 of the first flux barrier structure from the outside to the inside in a radial direction of the first-type lamination 3 are respectively defined as a first outside flux barrier layer, a first middle flux barrier layer and a first inside flux barrier layer. The first voids 33 of the first outside flux barrier layer, the first middle flux barrier layer and the first inside flux barrier layer close to the outer peripheral edge of the first-type lamination 3 are respectively defined as first outer layer extremity voids, first middle layer extremity voids and first inner layer extremity voids. Each extremity void has two void edges extending substantially transversely with respect to an approximate extension direction of the corresponding first flux barrier layer 31 (i.e. an extension direction of a main body portion of the first flux barrier layer), comprising an outer void edge closer to the outer peripheral edge of the first-type lamination and an inner void edgefurther away from this outer peripheral edge. The distances from the midpoints of the respective inner void edges of the first outer layer extremity void, the first middle layer extremity void and the first inner layer extremity void among the three extremity voids on either side of the first central axis X to the center 0 of the first-type lamination 3 are respectively L1, L2 and L3. In an advantageous design, these distance values may be designed such that L3 < L1 < L2, so as to achieve optimal electromagnetic performance.
[0050] Correspondingly, the three second flux barrier layers 41 of the second flux barrier structure shown in Fig. 9 from the outside to the inside in a radial direction of the second-type lamination 4 are respectively defined as a second outside flux barrier layer, a second middle flux barrier layer and a second inside flux barrier layer. The second voids 43 of the second outside flux barrier layer, the second middle flux barrier layer and the second inside flux barrier layer close to the outer peripheral edge of the second-type lamination 4 are respectively defined as second outer layer extremity voids, second middle layer extremity voids and second inner layer extremity voids. Each extremity void in the second flux barrier structure has two void edges extending transversely with respect to an approximate extension direction of the corresponding second flux barrier layer 41 (i.e. an extension direction of a main body portion of the second flux barrier layer), comprising an outer void edge closer to the outer peripheral edge of the second-type lamination and an inner void edge further away from this outer peripheral edge. The distances from the midpoints of the respective inner void edges of the second outer layer extremity void, the second middle layer extremity void and the second inner layer extremity void among the three extremity voids on either side of the second central axis to the center O' of the second-type lamination 4 are respectively L1, L2 and L3. Likewise, these distance values may be designed such that L3 < L1 < L2.
[0051] Referring to Figs. 1 and 6 - 9, the rotor flux barrier slots 101 provided with the first structures and the second structures are filled with a permanent magnetic material. The permanent magnetic material may be formed by mixing a plastic with magnetic particles, and is packed into the flux barrier slots by injection moulding, wherein the magnetic particles may be SmFeN (samarium iron nitride) or NdFeB or a mixture of multiple other permanent magnet alloys. The interior of the flux barrier slots 101 formed by stacking of the corresponding extremity voids close to the outer peripheraledges of the first-type lamination 3 and the second-type lamination 4 may act as air gaps, or may be filled with an insulating material by direct injection moulding, or insertion after shaping. The interior of the flux barrier slots 101 formed by stacking of the middle first voids 33 and second voids 43 may be filled with a permanent magnetic material or an insulating material depending on actual needs, or may act as air gaps.
[0052] As described above, the rotor according to the present invention is formed by stacking the first-type lamination 3 and the second-type lamination 4, and the first and second structures offset with respect to one another that are provided in the laminations of different types increase the surface of contact between the permanent magnetic material filling the flux barrier slots that are formed and the rotor laminations, increasing the resistance of the permanent magnetic material to centrifugal force, and thereby increasing the force binding the first lamination set 1 and the second lamination set 2 to the permanent magnetic material, to ensure that the rotor, or the electric motor comprising the rotor, is able to operate stably at high speed for a long period of time.
[0053] A person skilled in the art could make various amendments and changes to the embodiments disclosed above without departing from the scope or spirit of the present invention. Based on the implementation of the present invention disclosed herein, other embodiments of the present invention will be obvious to a person skilled in the art. This specification and the examples disclosed therein should be regarded as being merely illustrative; the true scope of the present invention is designated by the appended claims and their equivalents.
Claims
Claims1. A rotor, comprising at least one first lamination set (1) and at least one second lamination set (2) stacked on each other, the first lamination set being formed by stacking at least one first-type lamination (3), and the second lamination set being formed by stacking at least one second-type lamination (4), wherein the first-type lamination (3) has multiple first flux barrier structures spaced apart in a circumferential direction thereof, each first flux barrier structure comprising multiple first flux barrier layers (31) spaced apart from one another in a radial direction, and each first flux barrier layer comprising multiple first flux bridges (32) and multiple first voids (33) bridge-connected to each other by means of the multiple first flux bridges;the second-type lamination (4) has multiple second flux barrier structures spaced apart in a circumferential direction thereof, each second flux barrier structure comprising multiple second flux barrier layers (41) spaced apart from one another in a radial direction, and each second flux barrier layer comprising multiple second flux bridges (42) and multiple second voids (43) bridge-connected to each other by means of the multiple second flux bridges;wherein, when the at least one first lamination set (1) and the at least one second lamination set (2) are stacked on each other, the first voids in the first lamination set are aligned with the corresponding second voids in the second lamination set to form flux barrier slots of the rotor;wherein each first flux barrier layer (31 ) is provided with a first structure in at least one first void (33), the first structure extending in such a way as to deviate from a main body extension direction of at least one edge defining the first void; each second flux barrier layer (41) is provided with a second structure in at least one second void (43), the second structure extending in such a way as to deviate from a main body extension direction of at least one edge defining the second void; and the flux barrier slot provided with the first structure and the second structure in the rotor is filled with a permanent magnetic material;wherein, when the at least one first lamination set (1) and the at least one second lamination set (2) are stacked on each other, the first structure in each first flux barrier layer (31 ) in the first lamination set is offset with respect to the second structure in the second flux barrier layer (41) in the second lamination set that is aligned with the first flux barrier layer.
2. The rotor as claimed in claim 1 , wherein each first flux barrier layer forms an arch shape or arc shape which is arched away from an outer peripheral edge of the first-type lamination (3) toward the center of the first-type lamination, and / or each second flux barrier layer forms an arch shape or arc shape which is arched away from an outer peripheral edge of the second-type lamination (4) toward the center of the second-type lamination.
3. The rotor as claimed in claim 2, wherein the first structure comprises at least one first protrusion (34) projecting into the first void from a first edge of the first void (33) and / or at least one second protrusion (35) projecting into the first void from a second edge of the first void, the first edge and second edge of the first void being opposite each other.
4. The rotor as claimed in claim 3, wherein the second structure comprises at least one third protrusion (44) projecting into the second void from a first edge of the second void (43) and / or at least one fourth protrusion (45) projecting into the second void from a second edge of the second void, the first edge and second edge of the second void being opposite each other, wherein the first protrusion and the third protrusion are offset with respect to each other, and the second protrusion and the fourth protrusion are offset with respect to each other.
5. The rotor as claimed in claim 2, wherein the first structure comprises at least one first recess (36) sunk into lamination material surrounding the first void from a first edge of the first void (33) and / or at least one second recess (37) sunk into lamination material surrounding the first void from a second edge of the first void, the first edge and second edge of the first void being opposite each other.
6. The rotor as claimed in claim 5, wherein the second structure comprises at least one third recess (46) sunk into lamination material surrounding the second void from a first edge of the second void (43) and / or at least one fourth recess (47) sunk into lamination material surrounding the second void from a second edge of the second void, the first edge and second edge of the second void being opposite each other, wherein the first recess and the third recess are offset with respect to each other, and the second recess and the fourth recess are offset with respect to each other.
7. The rotor as claimed in any one of claims 2 - 6, wherein the multiple first voids (33) comprised in each first flux barrier layer (31) are distributed symmetrically with respect to a first central axis (X) of the first flux barrier layer, wherein one first void is arranged on the first central axis; and two first voids directly adjacent to the first void arranged on the first central axis are each provided with the first structure;the multiple second voids (43) comprised in each second flux barrier layer (41) are distributed symmetrically with respect to a second central axis (X1) of the second flux barrier layer, wherein one second void is arranged on the second central axis; and two second voids directly adjacent to the second void arranged on the second central axis are each provided with the second structure.
8. The rotor as claimed in claim 7, wherein the first flux barrier structure comprises three first flux barrier layers (31) spaced apart from one another in a radial direction; the three first flux barrier layers are respectively defined as a first outside flux barrier layer, a first middle flux barrier layer and a first inside flux barrier layer, from the outside to the inside in a radial direction of the first-type lamination; the first voids in the first outside flux barrier layer, the first middle flux barrier layer and the first inside flux barrier layer that are close to the outer peripheral edge of the first-type lamination (3) are respectively defined as first outer layer extremity voids, first middle layer extremity voids and first inner layer extremity voids; each extremity void has two void edges extending transversely with respect to an approximate extension direction of the corresponding first flux barrier layer, the two void edges comprising an outer void edge closer to the outer peripheral edge of the first-type lamination and an inner void edge further away from this outer peripheral edge, wherein distances from midpoints of the respective inner void edges of the first outer layer extremity void, the first middle layer extremity void and the first inner layer extremity void among the three extremity voids on either side of the first central axis to the center of the first-type lamination are respectively L1 , L2 and L3, wherein L3 < L1 < L2;the second flux barrier structure comprises three second flux barrier layers (41 ) spaced apart from one another in a radial direction, and extremity voids in the second flux barrier layers are configured in the same manner as the extremity voids in the first flux barrier layers.
9. The rotor as claimed in any one of claims 1 - 6, wherein the rotor is formed17of only one first lamination set (1 ) and only one second lamination set (2) which are stacked one on top of another; or formed of multiple first lamination sets (1) and multiple second lamination sets (2) which are stacked alternately.
10. An electric motor, wherein the electric motor comprises the rotor as claimed in any one of claims 1 - 9.