High-performance motor rotor core

Abstract

The invention discloses a high-performance motor rotor core which comprises a rotor punching sheet, and a plurality of magnetic steel groove groups are distributed on the rotor punching sheet along the circumferential direction of the rotor punching sheet. The magnetic isolation bridge is simple in structure and reasonable in design, by arranging the stress reduction structure with the centrosymmetric characteristic, the main radial stress is effectively guided and released in a magnetic isolation bridge area, stress distribution is optimized, fatigue cracks caused by local stress concentration are avoided, the fatigue life of the magnetic isolation bridge is prolonged, the structural safety margin is improved, and the service life of the magnetic isolation bridge is prolonged. An unloading structure composed of the main grooves and the auxiliary grooves is compact in structure and easy to machine, the NVH performance is improved, electromagnetic harmonic waves are reduced, the stability and the silence of motor operation are improved, meanwhile, the overall magnetic steel groove layout is structurally optimized, reasonable reduction of used materials and lightweight design of the rotor iron core are achieved, and the cost is reduced. And the power density and the dynamic response capability are improved on the premise of ensuring the electromagnetic performance.

Description

Technical Field

[0001] The present invention relates to the technical field of motors, and in particular to a high-performance motor rotor core. Background Art

[0002] With the rapid development of the new energy vehicle industry, drive motors, as core components, are facing higher performance requirements, particularly in terms of high speed, high power density, and low noise and vibration. As the component in the motor that bears the greatest centrifugal force, the rotor's mechanical strength is directly related to its safe operation. Under high-speed operating conditions, the rotor core is extremely susceptible to severe centrifugal loads. If its structural design is not adequately adapted to these conditions, fatigue cracks and even fracture are highly likely to occur. Therefore, improving the strength and stability of the rotor core structure has become a key focus of the industry.

[0003] Existing technologies often use high-strength stamping materials to enhance structural performance. While effective, this often leads to increased costs and can affect the motor's electromagnetic performance, thereby reducing power output and efficiency. In contrast, optimizing the stamping structure design to achieve stress dispersion and improve strength is a more cost-effective solution. Summary of the Invention

[0004] The object of the present invention is to provide a high-performance motor rotor core to solve the problems raised in the above background technology.

[0005] To achieve the above object, the present invention provides the following technical solution: a high-performance motor rotor core, comprising a plurality of rotor punchings, wherein a plurality of magnetic steel slot groups are arranged on the rotor punchings along the circumference thereof;

[0006] The magnetic steel slot group includes:

[0007] at least one pair of V-shaped magnetic steel slots, wherein the V-shaped magnetic steel slots are formed on the rotor punchings;

[0008] A one-shaped magnetic steel slot, wherein the one-shaped magnetic steel slot is provided between at least one pair of the V-shaped magnetic steel slots, the V-shaped magnetic steel slots and the one-shaped magnetic steel slots are centrally symmetrically distributed, the one-shaped magnetic steel slots form a magnetic isolation bridge on one side facing the adjacent V-shaped magnetic steel slots, the one-shaped magnetic steel slots are provided with a bottom edge in the direction of the center of the rotor punching, and the main radial centerline of the magnetic isolation bridge is perpendicular to the bottom edge line of the one-shaped magnetic steel slots;

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

[0010] Preferably, the stress reduction structure comprises:

[0011] A main slot, the main slot being opened on one side of the bottom edge of the one-shaped magnetic steel slot;

[0012] A secondary slot is provided between the main slot and the one-shaped magnetic steel slot, and is used to connect the main slot with the one-shaped magnetic steel slot.

[0013] Preferably, the main slot is provided with a protrusion facing the center line of the first-shaped magnetic steel slot.

[0014] Preferably, the auxiliary grooves are arranged toward the side of the V-shaped magnetic steel groove and are symmetrically arranged along the center line of the main radial magnetic isolation bridge relative to the side of the V-shaped magnetic steel groove.

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

[0016] Preferably, the stress reduction structure is a unloading groove, the edge contour of which is collinear or tangent to the extension lines of the two end sides of the one-shaped magnetic steel groove.

[0017] Preferably, a second boss is provided at the intersection of the side lines at both ends of the magnetic steel slot and the bottom line.

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

[0019] Preferably, the distance between the ends of the V-shaped magnetic steel slot and the island-shaped unloading slot, which are respectively closest to the center of the iron core, along the center line direction of the single-shaped magnetic steel slot is greater than or equal to zero.

[0020] Preferably, the distance between the extension line formed by the side lines of both ends of the one-shaped magnetic steel slot toward the center of the iron core and the center line of the one-shaped magnetic steel slot is smaller than the distance between its original side line body and the center line.

[0021] Compared with the prior art, the present invention has the following beneficial effects:

[0022] This high-performance motor rotor core, by setting a stress reduction structure with central symmetry characteristics, such as ear-shaped unloading grooves or island-shaped unloading grooves, realizes the effective guidance and release of the main radial stress in the magnetic isolation bridge area, optimizes the stress distribution, and avoids fatigue cracks caused by local stress concentration, thereby significantly improving the fatigue life and structural safety margin of the magnetic isolation bridge. The unloading structure composed of the main slot and the auxiliary slot is not only compact and easy to process, but also improves the NVH performance, reduces electromagnetic harmonics, and improves the smoothness and quietness of the motor operation. At the same time, the overall magnetic steel slot layout has been structurally optimized to achieve a reasonable reduction in material use and a lightweight design of the rotor core. The power density and dynamic response capability are improved under the premise of ensuring electromagnetic performance, meeting the requirements of high-performance and high-dynamic operating conditions in applications such as new energy vehicles. BRIEF DESCRIPTION OF THE DRAWINGS

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

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

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

[0026] Figure 4 It is an enlarged view of point B of the present invention;

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

[0028] In the figure: 1. Rotor punching sheet; 2. Magnetic steel slot group; 201. V-shaped magnetic steel slot; 202. I-shaped magnetic steel slot; 203. Magnetic isolation bridge; 2021. Bottom edge; 204. Stress reduction structure; 2041. Main slot; 2042. Auxiliary slot; 3. Protrusion; 4. First boss; 5. Unloading slot; 6. Second boss. DETAILED DESCRIPTION

[0029] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0030] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like to indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0031] In the description of this patent, it should be noted that, unless otherwise expressly specified or limited, the terms "installed," "connected," and "disposed" should be understood broadly. For example, they can refer to fixed connection or disposition, detachable connection or disposition, or integrated connection or disposition. Those skilled in the art will understand the specific meanings of the above terms in this patent based on 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 the technical features being referred to. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of such features. In the description of the present invention, "several" means two or more, unless otherwise specifically defined.

[0033] Example 1

[0034] See also Figure 1-2 As shown, the present invention provides a technical solution for a high-performance motor rotor core: a high-performance motor rotor core, comprising a plurality of rotor punchings 1, on which a plurality of magnetic steel slot groups 2 are distributed along the circumference;

[0035] The magnetic steel slot group 2 includes a single-shaped magnetic steel slot 202, at least a pair of V-shaped magnetic steel slots 201 and a stress reduction structure 204. The V-shaped magnetic steel slot 201 is opened on the rotor punching 1. A single-shaped magnetic steel slot 202 is opened between at least a pair of V-shaped magnetic steel slots 201. The V-shaped magnetic steel slot 201 and the single-shaped magnetic steel slot 202 are distributed in a centrally symmetrical manner. The single-shaped magnetic steel slot 202 forms a magnetic isolation bridge 203 on one side facing the adjacent V-shaped magnetic steel slot 201. The single-shaped magnetic steel slot 202 is provided with a bottom edge 2021 in the direction of the center of the rotor punching 1. The main radial center line of the magnetic isolation bridge 203 is perpendicular to the bottom edge line 2021 of the single-shaped magnetic steel slot 202. The stress reduction structure 204 is arranged at both ends of the single-shaped magnetic steel slot 202 in a centrally symmetrical manner. It can be connected to or separated from the magnetic steel slot group 2 to reduce the stress concentration in the main radial direction at the magnetic isolation bridge 203.

[0036] It should be noted that the main radial center line refers to a reference line that is perpendicular to the center position of the magnetic isolation bridge 203 and parallel to the surface of the rotor punching 1 where it is located.

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

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

[0039] The auxiliary grooves 2042 are disposed toward the side of the V-shaped magnetic steel groove 201 and are symmetrically arranged along the center line of the main radial magnetic isolation bridge 203 relative to the side of the V-shaped magnetic steel groove 201 .

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

[0041] In this embodiment, the stress reduction structure 204 may be further designed to be ear-shaped.

[0042] When the rotor punching sheet 1 of the ear-shaped stress reduction structure 204 is punched, for a single-shaped magnetic steel slot 202 , two small ears on both sides can be punched out by two small punches respectively, and the remaining portion can be punched out by one punch.

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

[0044] Compared with existing technologies such as Figure 5 Compared with the traditional slot structure shown in FIG, the present invention disperses the structural stress while maintaining the compactness of the magnetic steel slot structure, thereby improving the fatigue life and structural safety margin of the magnetic isolation bridge 203, thereby improving 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 harshness) during the operation of the motor.

[0046] Structural optimization also achieves a reasonable reduction and lightweight design of the core material, 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 working conditions.

[0047] Example 2

[0048] like Figure 3 、 Figure 4 As shown, this embodiment is improved on the basis of embodiment 1, and the difference is that the stress reduction structure 204 is a unloading groove 5, and its edge contour is collinear or tangent to the extension line of the two end sides of the magnetic steel groove 202.

[0049] In this embodiment, the unloading groove 5 is in the shape of an island.

[0050] A second boss 6 is provided at the intersection of the two end sides of the first-shaped magnetic steel slot 202 and the bottom side 2021 .

[0051] The distance d between the island-shaped unloading groove 5 and the center line of the one-shaped magnetic steel groove 202 is greater than or equal to the distance c between the center line of the one-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 slot 201 and the island-shaped unloading slot 5 closest to the center of the core along the center line of the I-shaped magnetic steel slot 202 is greater than or equal to zero (e≥0).

[0053] The distance g between the extension line of the two end sides of the magnetic steel slot 202 toward the center of the core and the center line of the magnetic steel slot 202 is smaller than the distance f between the original side body and the center line (g≤f).

[0054] The solution and method proposed in the present invention are applicable to motor rotor punchings of any thickness, and are applicable to any rotor core, rotor core assembly, motor rotor, motor using the rotor punchings, and power assembly, vehicle, and equipment using the motor.

[0055] The above shows and describes 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 above embodiments and descriptions are merely preferred examples of the present invention and are not intended to limit the present invention. Various changes and improvements may be made to the present invention without departing from the spirit and scope of the present invention. Such changes and improvements fall within the scope of the present invention. The scope of protection claimed in the present invention is defined by the appended claims and their equivalents.

Claims

1. A high-performance motor rotor core, characterized by: The rotor punching comprises a plurality of rotor sheets, each of which is provided with a plurality of magnetic steel slot groups distributed along its circumference; The magnetic steel slot group includes: at least one pair of V-shaped magnetic steel slots, wherein the V-shaped magnetic steel slots are formed on the rotor punchings; A one-shaped magnetic steel slot, wherein the one-shaped magnetic steel slot is provided between at least one pair of the V-shaped magnetic steel slots, the V-shaped magnetic steel slots and the one-shaped magnetic steel slots are centrally symmetrically distributed, the one-shaped magnetic steel slots form a magnetic isolation bridge on one side facing the adjacent V-shaped magnetic steel slots, the one-shaped magnetic steel slots are provided with a bottom edge in the direction of the center of the rotor punching, and the main radial centerline of the magnetic isolation bridge is perpendicular to the bottom edge line of the one-shaped magnetic steel slots; A stress reduction structure is provided at both ends of the one-shaped magnetic steel slot in a centrally symmetrical manner. The stress reduction structure can be connected to or separated from the magnetic steel slot and is used to reduce stress concentration in the main radial direction at the magnetic isolation bridge.

2. A high-performance motor rotor core according to claim 1, characterized in that: The stress reduction structure comprises: A main slot, the main slot being opened on one side of the bottom edge of the one-shaped magnetic steel slot; A secondary slot is provided between the main slot and the one-shaped magnetic steel slot, and is used to connect the main slot with the one-shaped magnetic steel slot.

3. The high-performance motor rotor core according to claim 2, characterized in that: The main slot is provided with a protrusion facing the center line of the first-shaped magnetic steel slot.

4. The high-performance motor rotor core according to claim 2, characterized in that: The auxiliary grooves are arranged toward the side of the V-shaped magnetic steel groove and are symmetrically arranged along the center line of the main radial magnetic isolation bridge relative to the side of the V-shaped magnetic steel groove.

5. The high-performance motor rotor core according to claim 2, characterized in that: A first boss is provided at the connection between the first-shaped magnetic steel slot and the auxiliary slot, and the width of the first boss is ≥0.5mm.

6. The high-performance motor rotor core according to claim 1, characterized in that: The stress reduction structure is a unloading groove, and the edge contour of the unloading groove is collinear or tangent to the extension lines of the two end sides of the one-shaped magnetic steel groove.

7. The high-performance motor rotor core according to claim 6, characterized in that: A second boss is provided at the intersection of the side lines at both ends and the bottom line of the first-shaped magnetic steel slot.

8. The high-performance motor rotor core according to claim 7, characterized in that: The distance between the island-shaped unloading groove and the center line of the one-shaped magnetic steel groove is greater than or equal to the distance between the center line of the one-shaped magnetic steel groove and the second boss.

9. The high-performance motor rotor core according to claim 7, characterized in that: The distance between the ends of the V-shaped magnetic steel slot and the island-shaped unloading slot, which are respectively closest to the center of the iron core, along the center line direction of the single-shaped magnetic steel slot is greater than or equal to zero.

10. The high-performance motor rotor core according to claim 7, characterized in that: The distance between the extension lines formed by the two end sides of the magnetic steel slot toward the center of the iron core and the center line of the magnetic steel slot is smaller than the distance between its original side body and the center line.

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