High performance motor rotor core

Abstract

The application discloses a high-performance motor rotor core, comprising rotor laminations, wherein a plurality of magnetic steel slot groups are arranged on the rotor laminations in a circumferential direction; the application has simple structure and reasonable design; stress reduction structures with central symmetry characteristics are arranged to effectively guide and release main radial stress in the magnetic bridge area, optimize stress distribution, avoid fatigue cracks caused by local stress concentration, improve fatigue life and structural safety margin of the magnetic bridge, and improve NVH performance, reduce electromagnetic harmonics, and improve stability and quietness of motor operation; in addition, the overall magnetic steel slot layout is optimized to realize reasonable reduction of material use and lightweight design of the rotor core, and improve power density and dynamic response capability under the premise of guaranteeing electromagnetic performance.

Description

Technical Field

[0001] This invention relates to the field of motor technology, specifically to a high-performance motor rotor core. Background Technology

[0002] With the rapid development of the new energy vehicle industry, drive motors, as core components, face higher performance requirements, especially in terms of high speed, high power density, and low noise and vibration. The rotor, as the component in the motor that bears the greatest centrifugal force, directly affects the motor's safe operation due to its mechanical strength. Under high-speed operating conditions, the rotor core is highly susceptible to severe centrifugal loads. If its structural design fails to adequately adapt to these conditions, fatigue cracks or even fractures are highly likely. Therefore, improving the strength and stability of the rotor core structure has become a key focus of the industry.

[0003] In existing technologies, high-strength lamination materials are often used to enhance structural performance. While effective, this often leads to increased costs and may affect the electromagnetic performance of the motor, thereby reducing power output and efficiency. In contrast, optimizing the lamination structure design to achieve stress dispersion and strength enhancement is a more economical and efficient solution. Summary of the Invention

[0004] The purpose of this invention is to provide a high-performance motor rotor core to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a high-performance motor rotor core, comprising multiple rotor laminations, wherein multiple magnetic slot groups are arranged circumferentially on the rotor laminations;

[0006] The magnetic steel trough assembly includes:

[0007] At least one pair of V-shaped magnet slots, the V-shaped magnet slots being formed on the rotor laminations;

[0008] A shaped magnetic steel slot is provided, with at least one pair of V-shaped magnetic steel slots being provided between them. The V-shaped magnetic steel slots and the shaped magnetic steel slots are centrally symmetrically distributed. A magnetic isolation bridge is formed on one side of the shaped magnetic steel slot facing the adjacent V-shaped magnetic steel slot. The shaped magnetic steel slot has a bottom edge in the direction of the center of the rotor lamination. The main radial center line of the magnetic isolation bridge is perpendicular to the bottom edge line of the shaped magnetic steel slot.

[0009] A stress-reducing structure is provided at both ends of the shaped magnetic steel groove in a centrally symmetrical manner. It can be connected to or separated from the magnetic steel groove and is used to reduce the stress concentration in the main radial direction at the magnetic isolation bridge.

[0010] Preferably, the stress reduction structure includes:

[0011] The main groove is located on one side of the bottom edge of the shaped magnetic steel groove;

[0012] A secondary groove is formed between the main groove and the shaped magnet groove, and is used to connect the main groove and the shaped magnet groove.

[0013] Preferably, the main groove has a protrusion facing the center line of the shaped magnetic steel groove.

[0014] Preferably, the secondary groove is disposed toward the side of the V-shaped magnet groove and is arranged symmetrically with respect to the side of the V-shaped magnet groove along the center line of the main radial magnetic bridge.

[0015] Preferably, a first boss is provided at the connection between the shaped magnetic steel groove and the secondary groove, and the width of the first boss is ≥0.5mm.

[0016] Preferably, the stress-reducing structure is an unloading groove, the edge contour of which is collinear or tangent to the extension lines of the two ends of the shaped magnetic groove.

[0017] Preferably, a second protrusion is provided at the intersection of the edge lines and the bottom line at both ends of the shaped magnetic steel groove.

[0018] Preferably, the distance between the island-shaped unloading groove and the center line of the monolithic magnet groove is greater than or equal to the distance between the center line of the monolithic magnet groove and the second boss.

[0019] Preferably, the distance between the ends of the V-shaped magnet groove and the island-shaped unloading groove closest to the center of the iron core along the center line of the V-shaped magnet groove is greater than or equal to zero.

[0020] Preferably, the distance between the extension lines formed by the two end edge lines of the shaped magnetic steel groove towards the center of the iron core and the center line of the shaped magnetic steel groove is smaller than the distance between its original edge line body and the center line.

[0021] Compared with the prior art, the beneficial effects of the present invention are:

[0022] This high-performance motor rotor core, through the design of a stress-reducing structure with central symmetry, such as ear-shaped or island-shaped unloading slots, effectively guides and releases the principal radial stress in the magnetic bridge region, optimizes stress distribution, and avoids fatigue cracks caused by localized stress concentration, thereby significantly improving the fatigue life and structural safety margin of the magnetic bridge. The unloading structure composed of the main and auxiliary slots is not only compact and easy to manufacture, but also improves NVH performance, reduces electromagnetic harmonics, and enhances the smoothness and quietness of motor operation. Simultaneously, the overall magnet slot layout has been structurally optimized, achieving reasonable material reduction and a lightweight rotor core design. While ensuring electromagnetic performance, it improves power density and dynamic response capabilities, meeting the demands of high-performance, high-dynamic operating conditions in applications such as new energy vehicles. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the structure of the first embodiment of the present invention;

[0024] Figure 2 This is an enlarged view of point A in the present invention;

[0025] Figure 3 This is a schematic diagram of the structure of the second embodiment of the present invention;

[0026] Figure 4 This is an enlarged view of section B of the present invention;

[0027] Figure 5 This is a schematic diagram of the prior art structure of the present invention.

[0028] In the figure: 1. Rotor lamination; 2. Magnet slot assembly; 201. V-shaped magnet slot; 202. I-shaped magnet slot; 203. Magnetic bridge; 2021. Bottom edge; 204. Stress reduction structure; 2041. Main slot; 2042. Secondary slot; 3. Protrusion; 4. First boss; 5. Unloading slot; 6. Second boss. Detailed Implementation

[0029] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0030] In the description of this invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0031] In the description of this patent, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "setting" should be interpreted broadly. For example, they can refer to a fixed connection or setting, a detachable connection or setting, or an integrated connection or setting. Those skilled in the art can understand the specific meaning of the above terms in this patent according to the specific circumstances.

[0032] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a number" means two or more, unless otherwise explicitly specified.

[0033] Example 1

[0034] Please see Figure 1-2 As shown, the present invention provides a high-performance motor rotor core technical solution: a high-performance motor rotor core, comprising multiple rotor laminations 1, wherein multiple magnetic slot groups 2 are distributed along the circumference of the rotor laminations 1;

[0035] The magnet slot assembly 2 includes a shaped magnet slot 202, at least one pair of V-shaped magnet slots 201, and a stress reduction structure 204. The V-shaped magnet slots 201 are formed on the rotor lamination 1, and the shaped magnet slots 202 are formed between at least one pair of V-shaped magnet slots 201. The V-shaped magnet slots 201 and the shaped magnet slots 202 are centrally symmetrically distributed. The shaped magnet slots 202 form a magnetic isolation bridge 203 on one side facing the adjacent V-shaped magnet slots 201. The shaped magnet slots 202 have a bottom edge 2021 in the direction of the center of the rotor lamination 1. The main radial center line of the magnetic isolation bridge 203 is perpendicular to the bottom edge line 2021 of the shaped magnet slots 202. The stress reduction structure 204 is centrally symmetrically arranged at both ends of the shaped magnet slots 202. It can be connected to or separated from the magnet slot assembly 2 and is used to reduce the stress concentration in the main radial direction at the magnetic isolation bridge 203.

[0036] It should be noted that the aforementioned main radial centerline refers to the baseline that is perpendicular to the center position of the magnetic bridge 203 and parallel to the surface of the rotor lamination 1.

[0037] In this embodiment, the stress reduction structure 204 includes a main groove 2041 and a secondary groove 2042. The main groove 2041 is formed on one side of the bottom edge 2021 of the shaped magnetic steel groove 202. The secondary groove 2042 is formed between the main groove 2041 and the shaped magnetic steel groove 202 to connect the main groove 2041 and the shaped magnetic steel groove 202. The width a of the secondary groove 2042 is ≥0.7mm.

[0038] The main channel 2041 is provided with a protrusion 3 facing the center line of the shaped magnetic steel channel 202.

[0039] The secondary groove 2042 is arranged facing the side of the V-shaped magnetic groove 201 and is symmetrically arranged along the center line of the magnetic isolation bridge 203 in the main radial direction relative to the side of the V-shaped magnetic groove 201.

[0040] A first boss 4 is provided at the connection between the shaped magnetic steel groove 202 and the auxiliary groove 2042, and the width b of the first boss 4 is ≥ 0.5mm.

[0041] In this embodiment, the stress reduction structure 204 can be further designed in the shape of an ear.

[0042] When the rotor lamination 1 of the ear-shaped stress reduction structure 204 is stamped, for the one-shaped magnetic steel groove 202, two small punches can be used to punch out two small ears on both sides and one punch can be used to punch out the rest.

[0043] Through the above technical solution, the ear-shaped stress reduction structure 204 is set in a centrally symmetrical manner at both ends of the magnetic bridge 203. The unloading structure formed by its main groove 2041 and secondary groove 2042 can effectively guide and alleviate the main radial stress in the area of ​​the magnetic bridge 203 during motor operation, making the stress distribution more uniform and avoiding fatigue cracks caused by local stress concentration.

[0044] Compared to existing technologies, such as Figure 5 Compared with the conventional slot structure shown, the present invention maintains the compactness of the magnetic steel slot structure, disperses structural stress, improves the fatigue life and structural safety margin of the magnetic bridge 203, and thus improves the power density and output torque of the motor.

[0045] In addition, the symmetrical design of the ear-shaped stress reduction structure 204 helps to make the electromagnetic field distribution more balanced, effectively reducing the electromagnetic harmonic content and improving the NVH performance (noise, vibration and acoustic roughness) during motor operation.

[0046] Structural optimization also enables reasonable reduction and lightweight design of core materials, thereby reducing the overall weight of the rotor core without sacrificing performance, improving the dynamic response capability of the motor, and meeting the application requirements of high performance and high dynamic conditions.

[0047] Example 2

[0048] like Figure 3 , Figure 4 As shown, this embodiment is an improvement on embodiment 1. The difference is that the stress reduction structure 204 is an unloading groove 5, and its edge contour is collinear or tangent to the extension lines of the two ends of the shaped magnetic groove 202.

[0049] In this embodiment, the unloading slot 5 is shaped like an island.

[0050] A second protrusion 6 is provided at the intersection of the two end edges of the magnetic steel groove 202 and the bottom edge 2021.

[0051] The distance d between the island-shaped unloading groove 5 and the center line of the shaped magnetic steel groove 202 is greater than or equal to the distance c between the center line of the shaped magnetic steel groove 202 and the second boss 6 (d≥0.5c).

[0052] The distance between the ends of the V-shaped magnetic steel groove 201 and the island-shaped unloading groove 5 closest to the center of the iron core along the center line of the V-shaped magnetic steel groove 202 is greater than or equal to zero (e≥0).

[0053] The distance g between the extension lines formed by the two end edge lines of the shaped magnetic steel groove 202 towards the center of the iron core and the center line of the shaped magnetic steel groove 202 is less than the distance f between its original edge line body and the center line (g≤f).

[0054] The solutions and methods proposed in this invention are applicable to motor rotor laminations of any thickness, and to any rotor core, rotor core assembly, motor rotor, motor, and powertrain, vehicle, or equipment using the rotor laminations.

[0055] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely preferred examples and are not intended to limit the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. A high-performance motor rotor core, characterized in that: The device includes multiple rotor laminations, each lamination having multiple sets of magnet slots distributed circumferentially. Each magnet slot set includes: at least one pair of V-shaped magnet slots on the rotor laminations; a single-shaped magnet slot between the at least one pair of V-shaped magnet slots, the V-shaped and single-shaped magnet slots being centrally symmetrically distributed, each single-shaped magnet slot forming a magnetic bridge on one side facing the adjacent V-shaped magnet slot, the single-shaped magnet slot having a bottom edge at the center of the rotor lamination, and the main radial centerline of the magnetic bridge being perpendicular to the bottom edge of the single-shaped magnet slot; and a stress-reducing structure centrally symmetrically located at both ends of the single-shaped magnet slot, which can be connected to or separated from the magnet slots to reduce stress concentration in the main radial direction at the magnetic bridge. The stress reduction structure includes: a main groove, which is formed on one side of the bottom edge of the shaped magnet groove; and a secondary groove, which is formed between the main groove and the shaped magnet groove, for connecting the main groove and the shaped magnet groove. The main groove is provided with a protrusion facing the center line of the shaped magnetic steel groove; The secondary groove is positioned facing the side of the V-shaped magnet groove and is arranged symmetrically with respect to the side of the V-shaped magnet groove along the center line of the main radial magnetic bridge. The connection between the shaped magnetic steel groove and the auxiliary groove is provided with a first protrusion, and the width of the first protrusion is ≥0.5mm.

2. The high-performance motor rotor core according to claim 1, characterized in that: The stress reduction structure is replaced by an unloading groove, the edge contour of which is collinear or tangent to the extension lines of the two ends of the shaped magnetic groove. A second protrusion is provided at the intersection of the edge lines and the bottom line at both ends of the shaped magnetic steel groove; The distance between the unloading groove and the center line of the mono-shaped magnetic steel groove is greater than or equal to the distance between the center line of the mono-shaped magnetic steel groove and the second boss; The distance between the ends of the V-shaped magnetic steel groove and the unloading groove closest to the center of the iron core along the center line of the V-shaped magnetic steel groove is greater than or equal to zero. The distance between the extended lines formed by the two end edge lines of the shaped magnetic steel groove towards the center of the iron core and the center line of the shaped magnetic steel groove is smaller than the distance between its original edge body and the center line.

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