CN-114189078-B - Rotor core, manufacturing method thereof, rotor structure, motor and electrical equipment

Abstract

The invention provides a rotor core and a manufacturing method thereof, a rotor structure, a motor and electrical equipment, wherein the rotor core comprises at least two first punching sheets, at least two first punching sheets are distributed along the axial direction of the rotor core, two adjacent first punching sheets are connected, any one first punching sheet comprises at least two punching sheet units, at least two punching sheet units are distributed at intervals along the circumferential direction of the rotor core, a first interval is arranged between the two adjacent punching sheet units, any one punching sheet unit comprises at least two first magnetic conduction parts, at least two first magnetic conduction parts are distributed at intervals along the circumferential direction of the rotor core, a second interval is arranged between the two adjacent first magnetic conduction parts, a first connecting part is connected with the two adjacent first magnetic conduction parts through the first connecting part, and in the axial direction of the rotor core, the first interval of one first punching sheet is communicated with the second interval of the other first punching sheet, and the two opposite first magnetic conduction parts are connected.

Inventors

• Qu huan
• LI WENRUI
• ZHU ZIQIANG
• WU YUEHONG
• GAN LEI
• LI JUNLONG
• ZHOU YIHENG

Assignees

• 淮安威灵电机制造有限公司
• 美的威灵电机技术（上海）有限公司

Dates

Publication Date

20260508

Application Date

20211217

Claims (17)

1. 1. A rotor core, comprising: The rotor core comprises at least two first punching sheets, wherein the at least two first punching sheets are distributed along the axial direction of the rotor core, two adjacent first punching sheets are connected, any one of the first punching sheets comprises at least two punching sheet units, the at least two punching sheet units are distributed at intervals along the circumferential direction of the rotor core, a first interval is arranged between two adjacent punching sheet units, and any one of the punching sheet units comprises: At least two first magnetic conduction parts which are distributed at intervals in the circumferential direction of the rotor core, and a second interval is arranged between two adjacent first magnetic conduction parts; The first connecting parts are connected with two adjacent first magnetic conduction parts through the first connecting parts; wherein, in the axial direction of the rotor core, in two adjacent first punching sheets, the first interval of one first punching sheet is communicated with the second interval of the other first punching sheet, and two opposite first magnetic conduction parts are connected; The rotor core further includes: At least one second punching sheet connected to end portions of the at least two first punching sheets in an axial direction of the rotor core; the second punched sheet comprises: At least two second magnetic conduction parts are respectively connected with the at least two first magnetic conduction parts, and a third interval is arranged between two adjacent second magnetic conduction parts in the circumferential direction of the rotor core; the second connecting part is connected between two adjacent second magnetic conduction parts; the third interval of the second punching sheet is respectively connected with the first interval and the second interval of the first punching sheet; The rotor core further includes: And the magnet grooves are positioned between the two adjacent first magnetic conduction parts and are used for accommodating permanent magnets, and each magnet groove comprises a first interval, a second interval and a third interval which are communicated.
2. 2. The rotor core as recited in claim 1, wherein, One of the first connecting parts is connected between two adjacent first magnetic conductive parts, or At least two first connecting parts are connected between two adjacent first magnetic conduction parts.
3. 3. The rotor core as recited in claim 1, wherein, The at least two second magnetic conduction parts and the second connecting part are of an integrated structure.
4. 4. A rotor structure, comprising: A rotor core according to any one of claims 1 to 3.
5. 5. The rotor structure of claim 4, further comprising: the permanent magnets are arranged in the magnet grooves of the rotor core, and the polarities of two adjacent permanent magnets are opposite.
6. 6. The rotor structure of claim 5, wherein the rotor core further comprises: the first limiting part is arranged at the end part of the first magnetic conduction part and used for limiting the permanent magnet.
7. 7. The rotor structure according to any one of claim 4 to 6, wherein, The rotor core is of an annular structure; The rotor structure further comprises a rotating shaft, and the rotating shaft penetrates through the rotor core and is connected with the rotor core.
8. 8. The rotor structure of claim 7, wherein the rotor structure comprises a plurality of rotor segments, The rotating shaft comprises a second limiting part, and the second limiting part protrudes out of the rotating shaft in the radial direction; the inner wall of the magnet groove of the rotor core is provided with a third limiting part, and at least one part of the second limiting part extends into the magnet groove and is connected with the second limiting part.
9. 9. The rotor structure of claim 8, wherein the third limiting portion is a limiting groove, and the second limiting portion includes: The extension part protrudes out of the radial arrangement of the rotating shaft, and the end part of the extension part stretches into the magnet groove; and the limiting protrusion is arranged at the end part of the extension part and is connected with the limiting groove.
10. 10. An electric machine, comprising: A stator structure; a rotor structure as claimed in any one of claims 4 to 9.
11. 11. The electric machine of claim 10, wherein the stator structure comprises: Stator teeth, wherein stator grooves are formed between two adjacent stator teeth; the winding is wound on the stator teeth and is positioned in the stator slot; wherein the number of magnet slots Nr of the rotor structure, the number of stator slots Ns, and the pole pair number Pa of the windings satisfy pa= -Nr/2±ns.
12. 12. An electrical device, comprising: an electrical machine as claimed in claim 10 or 11.
13. 13. A manufacturing method of a rotor core for manufacturing the rotor core according to any one of claims 1 to 3, characterized by comprising: And stamping at least two first stamping sheets in a divided manner, wherein in the process of stamping two adjacent stamping sheets, the second interval of the first stamping sheets subjected to the second stamping is communicated with the first interval of the first stamping sheets subjected to the first stamping.
14. 14. The method of manufacturing a rotor core as recited in claim 13, wherein, And in the process of punching at least two first punching sheets in a plurality of times, the first punching sheet punched for the second time rotates by a preset angle compared with the first punching sheet punched for the first time.
15. 15. The method of manufacturing a rotor core as recited in claim 14, wherein, The preset angle is (2 Xk-1) multiplied by 360/Npm, wherein k is an integer, and Npm is the pole number of the rotor core.
16. 16. The method for manufacturing a rotor core according to any one of claims 13 to 15, wherein, And stamping one or at least two stamping units at a time in the process of stamping the first stamping.
17. 17. The method of manufacturing a rotor core according to any one of claims 13 to 15, characterized by further comprising: Stamping a portion of the second punched sheet before stamping at least two of the first punched sheets in multiple passes, and And stamping a part of the second punched pieces after stamping at least two first punched pieces in a plurality of times.

Description

Rotor core, manufacturing method thereof, rotor structure, motor and electrical equipment Technical Field The invention relates to the technical field of motor rotors, in particular to a rotor core, a manufacturing method thereof, a rotor structure, a motor and electrical equipment. Background In the related art, a part of rotor core is integrally stamped, so that the utilization rate of core materials is low, and waste exists. In the related art, a part of the rotor core is in the form of a split block, but the additional air gap generated and the rigidity of the rotor are insufficient, resulting in deterioration of the electromagnetic performance and vibration noise of the motor. Disclosure of Invention The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, a first aspect of the present invention provides a rotor core. A second aspect of the present invention provides a rotor structure. A third aspect of the invention provides an electric machine. A fourth aspect of the present invention provides an electrical device. A fifth aspect of the present invention provides a method of manufacturing a rotor core. The first aspect of the invention provides a rotor core, which comprises at least two first punching sheets, wherein the at least two first punching sheets are distributed along the axial direction of the rotor core, the adjacent two first punching sheets are connected, any one first punching sheet comprises at least two punching sheet units, the at least two punching sheet units are distributed at intervals along the circumferential direction of the rotor core, a first interval is arranged between the adjacent two punching sheet units, any one punching sheet unit comprises at least two first magnetic conduction parts, the at least two first magnetic conduction parts are distributed at intervals along the circumferential direction of the rotor core, a second interval is arranged between the adjacent two first magnetic conduction parts, and a first connecting part is connected with the adjacent two first magnetic conduction parts through the first connecting part, wherein in the axial direction of the rotor core, the first interval of one first punching sheet is communicated with the second interval of the other first punching sheet, and the opposite two first magnetic conduction parts are connected. The rotor core provided by the invention comprises at least two first punching sheets. At least two first punching sheets are distributed along the axial direction of the rotor core, and two adjacent first punching sheets are connected. Furthermore, any one of the first punches comprises at least two punch units. At least two punching units are distributed at intervals along the circumferential direction of the rotor core, and a first interval is reserved between every two adjacent punching units in the circumferential direction of the rotor core. Further, any one of the punching units comprises at least two first magnetic conductive parts and a first connecting part. The rotor comprises a rotor core, at least two first magnetic conduction parts, a second magnetic conduction part and a first magnetic conduction part, wherein the at least two first magnetic conduction parts are distributed at intervals in the circumferential direction of the rotor core and form an annular structure, and a second interval is arranged between every two adjacent first magnetic conduction parts in the circumferential direction of the rotor core. In addition, be provided with first connecting portion between two adjacent first magnetic conduction portions, first connecting portion is located the second interval and is connected in two adjacent first magnetic conduction portions. Further, in the axial direction of the rotor core, in the adjacent two first punched pieces, the first space of one first punched piece is communicated with the second space of the other first punched piece, and the opposite two first magnetic conduction portions in the two first punched pieces are connected. That is, the adjacent two first punched sheets are distributed in a staggered manner in the circumferential direction of the rotor core, so that one first punched sheet rotates by a certain angle compared with the other first punched sheet, and further, the two connected punched sheet units in the one first punched sheet are connected through the punched sheet units in the other first punched sheet. In particular, in the rotor core provided by the invention, the first intervals and the second intervals are distributed in a staggered manner in the axial direction of the rotor core, so that on one hand, the connection of two adjacent punching sheet units on the same first punching sheet can be ensured, and on the other hand, the motor applying the rotor core is ensured to have lower magnetic leakage and higher torque density. Therefore, under the same motor volume, the motor applying the rotor c