Rotor punching sheet, rotor core and motor

Abstract

The invention discloses a rotor punching sheet, a rotor core and a motor, a plurality of first magnetic steel grooves are arranged along the circumferential direction of the rotor punching sheet at intervals, each first magnetic steel groove comprises a first groove and a second groove, the first groove is used for accommodating magnetic steel, at least one end of the first groove is connected with the second groove, the first groove comprises two first straight line segments which are oppositely arranged, and the first straight line segments and the second straight line segments are oppositely arranged. The second groove comprises a first arc section, a second linear section and a third linear section which are sequentially connected, the first arc section is connected with one end of one first linear section, and one end of the third linear section is connected with the other first linear section. The rotor punching sheet is provided with the first magnetic steel groove comprising the first groove and the second groove, and the second groove is arranged at the end part of the first groove, so that the magnetic leakage phenomenon during the operation of the motor can be obviously reduced, the efficiency is improved, the torque is increased, the iron loss can be reduced, and the service life is prolonged.

Description

Technical Field

[0001] The invention relates to the technical field of motors, in particular to a rotor punching sheet, a rotor core and a motor. Background Art

[0002] At present, the rotor punching sheets that are punched and stacked to form the rotor core generally use straight-line magnetic steel slots or V-shaped magnetic steel slots. The straight-line magnetic steel slots have a more serious magnetic leakage phenomenon, while the V-shaped magnetic steel slots have higher tooth torque and torque pulsation. Torque pulsation can cause motor vibration, produce abnormal noise, and reduce service life and efficiency. The common methods for reducing the harmonic back electromotive force / torque pulsation of the motor in the existing system are distributed winding and skewed slot and skewed pole technology. In the process of realizing the invention, the inventor found that there are at least the following problems in the prior art: the use of distributed windings is complicated, the copper wire loss is more, and the cost is increased; the use of stator skewed slots will cause the winding ends to become longer, the end effect will increase, the copper loss will increase, the motor efficiency will decrease, and the enameled wire cost will increase; the rotor segmented skewed poles are the same as the skewed slots in principle, which can reduce torque pulsation, but will increase the inter-pole leakage and make the motor process complicated; the conventional V-shaped rotor has a relatively large leakage, which leads to increased iron loss and reduced efficiency. Summary of the invention

[0003] The purpose of the present invention is to provide a rotor punching sheet, a rotor core and a motor, so as to reduce the occurrence of magnetic leakage, reduce iron loss and improve the efficiency of the motor.

[0004] In a first aspect, the present invention provides a rotor punching, wherein a plurality of first magnetic steel slots are arranged at intervals along the circumferential direction of the rotor punching, wherein the first magnetic steel slots include a first slot and a second slot, wherein the first slot is used to accommodate a magnetic steel, and at least one end of the first slot is connected to the second slot, wherein: The first groove includes two first straight line segments arranged opposite to each other, and the second groove includes a first arc segment, a second straight line segment and a third straight line segment connected in sequence, the first arc segment is connected to one end of one of the first straight line segments, and there is a preset angle between the first arc segment and the first straight line segment, and one end of the third straight line segment is connected to another first straight line segment.

[0005] A rotor punching as described above, wherein, optionally, a limiting portion is provided in the first magnetic steel slot, and the limiting portion is used to limit the movement of the magnetic steel in the first slot.

[0006] A rotor punching as described above, wherein, optionally, the limiting portion includes a first stopper and a second stopper, the first stopper is arranged between the first arc segment and the first straight line segment, the second stopper is arranged on the inner wall surface of the first groove, and the first stopper and the second stopper are respectively abutted against two ends of the magnetic steel.

[0007] A rotor punching as described above, wherein, optionally, a plurality of magnetic steel slot pairs are arranged at intervals along the circumference of the rotor punching, each magnetic steel slot pair is composed of the first magnetic steel slot and the second magnetic steel slot, the first magnetic steel slot and the second magnetic steel slot are arranged in a V-shaped structure, and the opening of the V-shaped structure faces the circumferential direction of the rotor punching.

[0008] A rotor punching as described above, wherein, optionally, a width of the first slot of the first magnetic steel slot is different from a width of the second magnetic steel slot.

[0009] A rotor punching as described above, wherein, optionally, a width of the first slot of the first magnetic steel slot is smaller than a width of the second magnetic steel slot.

[0010] A rotor punching as described above, wherein, optionally, a plurality of weight-reducing holes are provided on the rotor punching.

[0011] A rotor punching as described above, wherein, optionally, an assembly hole is provided at the center of the rotor punching.

[0012] In a second aspect, the present invention provides a rotor core formed by stacking the aforementioned rotor punching sheets.

[0013] In a third aspect, the present invention provides a motor, comprising the aforementioned rotor core.

[0014] Compared with the prior art, the technical solution provided by the present invention has at least the following beneficial effects: The present invention arranges a first magnetic steel slot including a first slot and a second slot on the rotor punching sheet, and the second slot is arranged at the end of the first slot, which can significantly reduce the leakage magnetic phenomenon when the motor is running, thereby improving efficiency and increasing torque, while reducing iron loss and extending service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 is a schematic structural diagram of a first magnetic steel slot provided by one embodiment of the present invention; Figure 2 is a structural schematic diagram of a first magnetic steel slot provided by another embodiment of the present invention; Figure 3 It is a partial structural schematic diagram of a rotor punching provided by one embodiment of the present invention; Figure 4 is a schematic diagram of a partial structure of a rotor punching provided by another embodiment of the present invention; Figure 5 The simulation of the present invention Figure 1 ; Figure 6 The simulation of the present invention Figure 2; Figure 7 The simulation of the present invention Figure 3 ; Figure 8 The simulation of the present invention Figure 4 ; Fig. 9 The simulation of the present invention Figure 5 ; Fig.10 The simulation of the present invention Figure 6 ; Fig.11 The simulation of the present invention Figure 7 ; Fig.12 The simulation of the present invention Figure 8 .

[0016] Description of reference numerals: 10- rotor punching, 11- weight reduction hole, 12- assembly hole; 20-first magnetic steel slot, 21-first slot, 211-first straight segment, 22-second slot, 221-first arc segment, 222-second straight segment, 223-third straight segment, 23-limiting portion, 231-first stopper, 232-second stopper; 30- second magnetic steel slot; 40-Magnetic steel. DETAILED DESCRIPTION

[0017] The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, but should not be construed as limiting the present invention.

[0018] First, refer to Figures 1 to 3 As shown, the present invention provides a rotor punching 10, a plurality of first magnetic steel slots 20 are arranged at intervals along the circumference of the rotor punching 10, the first magnetic steel slots 20 include a first slot 21 and a second slot 22, the first slot 21 is used to accommodate the magnetic steel 40, and the second slot 22 is connected to at least one end of the first slot 21. In the embodiment provided by the present application, the second slot 22 is a functional slot or an auxiliary slot, and the functional slot or the auxiliary slot is arranged at the end of the first slot 21, so that when the motor is running, the magnetic leakage phenomenon can be significantly reduced, thereby improving the working efficiency of the motor, which is conducive to reducing vibration and noise problems and improving the performance of the motor.

[0019] In a feasible implementation, the first slot 21 includes two first straight segments 211 arranged opposite to each other, and the second slot 22 includes a first arc segment 221, a second straight segment 222 and a third straight segment 223 connected in sequence, the first arc segment 221 is connected to one end of one of the first straight segments 211, and one end of the third straight segment 223 is connected to another first straight segment 211, thereby forming a closed first magnetic steel slot 20, the magnetic steel 40 is accommodated between the two straight segments, and the first arc segment 221, the second straight segment 222 and the third straight segment 223 enclose to form a second slot 22 with a function of reducing magnetic leakage. Figure 1 As shown, the opening of the first arc segment 221 is away from the direction of the second groove 22, referring to Figure 2 As shown, the opening of the first arc segment 221 faces the direction of the second slot 22. No matter which direction the opening of the first arc segment 221 faces, there is a preset angle between the first arc segment 221 and the first straight segment 211, that is, the connection between the first arc segment 221 and the first straight segment 211 has a certain angle, so that the second slot 22 can have a variety of irregular shapes. Different from the regular "I"-shaped rotor punching 10 in the prior art, the magnetic steel slot with functional slot or auxiliary slot in the present application has the advantages of reducing the occurrence of magnetic leakage and improving output torque while realizing the basic functions. At the same time, it can reduce iron loss, which is beneficial to extend the service life, protect the equipment from damage, reduce safety hazards, and reduce electromagnetic radiation pollution.

[0020] In order to improve the stability of the magnetic steel 40 installed in the first slot 21, refer to Figure 1 as well as Figure 2 As shown, a limiting portion 23 is provided in the first magnetic steel slot 20, and the limiting portion 23 is used to limit the movement of the magnetic steel 40 in the first slot 21. Preferably, the limiting portion 23 includes a first stopper 231 and a second stopper 232, the first stopper 231 is provided between the first arc segment 221 and the first straight segment 211, and the second stopper 232 is provided on the inner wall surface of the first slot 21. When the magnetic steel 40 is installed in the first slot 21, the two ends of the magnetic steel 40 are respectively against the first stopper 231 and the second stopper 232, thereby limiting the movement of the magnetic steel 40 along the axial direction of the first slot 21.

[0021] Reference Figure 4As shown, in the embodiment provided by the present invention, a plurality of magnetic steel slot pairs are arranged at intervals along the circumferential direction of the rotor punching 10, and each magnetic steel slot pair is composed of a first magnetic steel slot 20 and a second magnetic steel slot 30. The first magnetic steel slot 20 is the magnetic steel slot with a functional slot or an auxiliary slot as mentioned above, and the structure of the second magnetic steel slot 30 is different from that of the first magnetic steel slot 20. The first magnetic steel slot 20 and the second magnetic steel slot 30 are arranged in a V-shaped structure, and the opening of the V-shaped structure faces the circumferential direction of the rotor punching 10. The rotor punching 10 composed of the magnetic steel slot pairs with a V-shaped structure is formed by stacking. Due to the different structures of the first magnetic steel slot 20 and the second magnetic steel slot 30, the first magnetic steel slot 20 and the second magnetic steel slot 30 form an asymmetric V-shaped structure, which can effectively reduce the occurrence of magnetic leakage, and can weaken the harmonic electromotive force and improve the air gap magnetic density.

[0022] In order to further reduce the occurrence of magnetic leakage, the width of the first slot 21 of the first magnetic steel slot 20 is different from the width of the second magnetic steel slot 30, that is, the width of the first slot 21 is different from the width of the second magnetic steel slot 30, and there is a width difference. When the motor is running, the occurrence of magnetic leakage can be further reduced. Preferably, the width of the first slot 21 of the first magnetic steel slot 20 is smaller than the width of the second magnetic steel slot 30, which can make the difference between the d-axis and q-axis inductances large, have sufficient magnetic resistance torque, improve the torque output capacity of the motor, and also reduce iron loss and improve motor efficiency. At the same time, it can also reduce torque pulsation, reduce vibration and noise during motor operation, and improve the service life of the motor, providing a strong guarantee for the reliable operation and long-term use of the motor.

[0023] In order to achieve lightweight and improve the NVH performance of the motor, a plurality of weight-reducing holes 11 are provided on the rotor punching 10. The plurality of weight-reducing holes 11 are arranged at intervals along the circumferential direction of the rotor punching 10. The plurality of weight-reducing holes 11 are provided to reduce the weight of the rotor punching 10, thereby reducing the weight of the rotor, saving materials, reducing the moment of inertia, and achieving the purpose of smooth operation.

[0024] Furthermore, after the rotor punchings 10 are stacked, they need to be connected to the rotating shaft to form a rotor, so an assembly hole 12 is provided at the center of the rotor punching 10, and the assembly hole 12 is used to connect to the rotating shaft. When multiple rotor punchings 10 are stacked, all the assembly holes 12 are coaxial.

[0025] In a second aspect, the present invention provides a rotor core formed by stacking the aforementioned rotor punchings 10. Whether the rotor core is formed by stacking rotor punchings 10 with a "I"-shaped structure or rotor punchings 10 with an asymmetric V-shaped structure, since both have the first magnetic steel slot 20 with a functional slot or an auxiliary slot, the rotor core has the characteristic of less magnetic leakage, thereby improving the performance of the rotor core.

[0026] Reference Figures 5 to 12As shown in the figure, it is a simulation diagram obtained by simulating the magnetic leakage phenomenon of the rotor core by using simulation software. The solid line in the figure is the magnetic leakage condition of the rotor core formed by stacking the rotor punchings 10 with the second slot 22 (functional slot or auxiliary slot), and the dotted line is the magnetic leakage condition of the rotor core formed by stacking the rotor punchings 10 without the second slot 22 (functional slot or auxiliary slot). It can be seen from the simulation diagram that the magnetic leakage phenomenon of the rotor core with the second slot 22 is significantly reduced compared with the magnetic leakage phenomenon of the rotor core without the second slot 22, and the output force is significantly increased.

[0027] In a third aspect, the present invention provides a motor, comprising the aforementioned rotor core. Since the rotor core is formed by stacking rotor sheets 10 having first magnetic steel slots 20, the NVH performance of the motor having the rotor core is greatly improved, and when the motor is running, magnetic leakage is reduced, iron loss is reduced, torque is increased, working efficiency is improved, and service life is extended.

[0028] The above describes in detail the structure, features and effects of the present invention based on the embodiments shown in the drawings. The above is only a preferred embodiment of the present invention, but the present invention is not limited to the scope of implementation shown in the drawings. Any changes made according to the concept of the present invention, or modifications to equivalent embodiments with equivalent changes, which still do not exceed the spirit covered by the description and drawings, should be within the protection scope of the present invention.

Claims

1. A rotor punching, characterized in that: A plurality of first magnetic steel slots are arranged at intervals along the circumferential direction of the rotor punching sheet, wherein the first magnetic steel slots include a first slot and a second slot, the first slot is used to accommodate the magnetic steel, and at least one end of the first slot is connected to the second slot, wherein: The first groove includes two first straight line segments arranged opposite to each other, and the second groove includes a first arc segment, a second straight line segment and a third straight line segment connected in sequence, the first arc segment is connected to one end of one of the first straight line segments, and there is a preset angle between the first arc segment and the first straight line segment, and one end of the third straight line segment is connected to another first straight line segment.

2. The rotor punching according to claim 1, characterized in that: A limiting portion is provided in the first magnetic steel slot, and the limiting portion is used to limit the movement of the magnetic steel in the first slot.

3. The rotor punching according to claim 2, characterized in that: The limiting portion includes a first stopper and a second stopper, wherein the first stopper is arranged between the first arc segment and the first straight segment, and the second stopper is arranged on the inner wall surface of the first groove, and the first stopper and the second stopper are respectively against two ends of the magnetic steel.

4. The rotor punching according to claim 1, characterized in that: A plurality of magnetic steel slot pairs are arranged at intervals along the circumference of the rotor punching sheet, each magnetic steel slot pair is composed of the first magnetic steel slot and the second magnetic steel slot, the first magnetic steel slot and the second magnetic steel slot are arranged in a V-shaped structure, and the opening of the V-shaped structure faces the circumferential direction of the rotor punching sheet.

5. The rotor punching according to claim 4, characterized in that: A width of the first groove of the first magnetic steel groove is different from a width of the second magnetic steel groove.

6. The rotor punching according to claim 5, characterized in that: A width of the first groove of the first magnetic steel groove is smaller than a width of the second magnetic steel groove.

7. The rotor punching according to claim 1, characterized in that: The rotor punching sheet is provided with a plurality of weight-reducing holes.

8. The rotor punching according to claim 1, characterized in that: An assembly hole is arranged at the center of the rotor punching sheet.

9. A rotor core, characterized in that: The rotor punchings described in any one of claims 1 to 8 are stacked together.

10. A motor, characterized in that: Comprising the rotor core as claimed in claim 9.

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