Integrated rotor iron core combining rotor punching sheet and rotating shaft through plastic coating

Abstract

The utility model belongs to the technical field of motors, and particularly relates to an integrated rotor iron core combining rotor punching sheets and a rotating shaft through plastic coating, which comprises a rotating shaft and laminated rotor punching sheets, the rotor punching sheets comprise a plurality of iron core splicing blocks, and the plurality of iron core splicing blocks are arranged along the circumference of the axis of the rotating shaft at intervals. A magnetic groove used for installing a magnetic shoe is formed between every two adjacent iron core splicing blocks, plastic-coated parts are formed among the rotor punching sheets, the magnetic shoes and the rotating shaft, anti-shrinkage grooves are formed in the upper end face and the lower end face of each plastic-coated part respectively, and the anti-shrinkage grooves are located between the rotating shaft and the rotor punching sheets. The rotor punching sheet, the rotating shaft and the magnetic shoe are tightly connected into a whole through plastic coating, parts and steps for assembly are reduced, magnetic flux leakage can be reduced, the effect of improving the performance of the motor is achieved, through the design of the anti-shrinkage grooves, the conditions of shrinkage, cracking and the like after plastic coating can be effectively prevented, the yield is improved, and the production cost is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of motors, in particular to an integrated rotor core which combines rotor punchings and a rotating shaft by plastic coating. Background Art

[0002] To meet the current needs of household appliances, motors are developing towards high power density. Permanent magnet synchronous motors are widely used in the field of household appliances due to their high efficiency, high power density, and fast response.

[0003] In order to achieve the characteristic of high power density and ensure structural strength in manufacturing while facilitating production, the widely used combination of punching sheets and magnetic tiles is: the magnetic tiles are inserted into the rotor core stacked with punching sheets in an internal manner to achieve better motor performance. However, the existing rotor structure is composed of a variety of components, and the production process and steps are too complicated, which is not conducive to large-scale automated production. Therefore, the structure needs to be further improved. Utility Model Content

[0004] The purpose of the utility model is to provide an integrated rotor core which combines rotor punchings and a rotating shaft by plastic coating, and solves the problem of complex structure of the existing one by plastic coating.

[0005] The purpose of the present utility model is achieved as follows: an integrated rotor core that combines rotor punchings and a rotating shaft by plastic coating, comprising a rotating shaft and stacked rotor punchings, the rotor punchings comprising a plurality of core pieces, the plurality of core pieces being spaced circumferentially along the axis of the rotating shaft, a magnetic groove for mounting magnetic tiles being formed between every two adjacent core pieces, a plastic coating being formed between the rotor punchings, the magnetic tiles and the rotating shaft, anti-shrinkage grooves being respectively provided on the upper and lower end surfaces of the plastic coating, the anti-shrinkage grooves being located between the rotating shaft and the rotor punchings.

[0006] Preferably, a side wall 1 is formed on one side of the anti-shrinkage groove, and a material thickness of 1-4 mm is provided between the side wall 1 and the rotating shaft.

[0007] Preferably, a second side wall is formed on the other side of the anti-shrinkage groove, and a material thickness of 1-4 mm is provided between the second side wall and the magnetic tile.

[0008] Preferably, a material thickness of 1-4 mm is provided between the upper and lower anti-shrinkage grooves.

[0009] Preferably, a material-saving hole is provided in the core block, and buckle grooves are provided on both sides of the material-saving hole.

[0010] Preferably, an arc portion is formed at one end of the core block, and a first magnet support portion is formed on both sides of the arc portion; the other end of the core block is formed at an acute angle portion, and a second magnet support portion is formed on both sides of the acute angle portion.

[0011] Preferably, a thermal break bridge is provided between the rotating shaft and the rotor punching sheet.

[0012] Compared with the prior art, the present invention has the following outstanding and beneficial technical effects:

[0013] The utility model fills the plastic coating material between each rotor punching sheet and the rotating shaft, and tightly connects the rotor punching sheet, the rotating shaft and the magnetic tile into one body through the plastic coating, thereby reducing the number of parts and steps for assembly, reducing magnetic leakage, and achieving the effect of improving the performance of the motor. Moreover, the design of the anti-shrinkage groove can effectively prevent shrinkage, cracking and the like after plastic coating, thereby improving the yield rate and reducing production costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic diagram of the three-dimensional structure of the utility model.

[0015] Figure 2 It is a schematic diagram of the top structure of the utility model.

[0016] Figure 3 for Figure 2 Schematic diagram of the cross-sectional structure at AA in the middle.

[0017] Figure 4 This is a schematic diagram of the structure of the utility model when it is not plastic-wrapped.

[0018] Figure 5 Schematic diagram of the structure of the core block.

[0019] Figure markings: 1-rotating shaft; 2-rotor punching sheet; 3-iron core block; 4-magnetic tile; 5-magnetic slot; 6-molded part; 7-anti-shrinkage slot; 8-side wall one; 9-side wall two; 10-material-saving hole; 11-buckle slot; 12-arc-shaped part; 13-magnet support part one; 14-acute angle part; 15-magnet support part two; 16-broken bridge. DETAILED DESCRIPTION

[0020] The specific implementation of the present invention is further described in detail below with reference to the accompanying drawings.

[0021] like Figure 1-5As shown, an integrated rotor core that combines rotor punchings and a rotating shaft by plastic coating includes a rotating shaft 1 and stacked rotor punchings 2. The rotor punchings 2 include a plurality of core segments 3. The plurality of core segments 3 are arranged at intervals along the axial center circumference of the rotating shaft 1. A magnetic slot 5 for installing a magnetic tile 4 is formed between every two adjacent core segments 3. A plastic coating 6 is formed between the rotor punchings 2, the magnetic tiles 4 and the rotating shaft 1. Compared with the prior art, the rotor shaft is removed, which not only ensures a stable connection in terms of strength, but also saves the use of shaft punching material, saves costs, and is beneficial to large-scale automated production. Anti-shrinkage grooves 7 are respectively provided on the upper and lower end surfaces of the plastic coating 6, and the anti-shrinkage grooves 7 are located between the rotating shaft 1 and the rotor punchings 2.

[0022] The utility model fills the plastic coating material between each rotor punching sheet and the rotating shaft, and tightly connects the rotor punching sheet, the rotating shaft and the magnetic tile into one body through the plastic coating, thereby reducing the number of parts and steps for assembly, reducing magnetic leakage, and achieving the effect of improving the performance of the motor. Moreover, the design of the anti-shrinkage groove can effectively prevent shrinkage, cracking and the like after plastic coating, thereby improving the yield rate and reducing production costs.

[0023] A side wall 8 is formed on one side of the anti-shrinkage groove 7, and a material thickness of 1-4 mm is set between the side wall 8 and the rotating shaft 1, thereby effectively preventing the occurrence of shrinkage, cracking, etc. after plastic coating.

[0024] A second side wall 9 is formed on the other side of the anti-shrinkage groove 7 , and a material thickness of 1-4 mm is provided between the second side wall 9 and the magnetic tile 4 , thereby effectively preventing shrinkage, cracking, etc. from occurring after plastic coating.

[0025] A material thickness of 1-4 mm is provided between the upper and lower anti-shrinkage grooves 7, thereby effectively preventing shrinkage, cracking and the like from occurring after plastic coating.

[0026] A material-saving hole 10 is provided in the core block 3, thereby reducing the cost of raw materials and lightening the weight of the rotor. Buckle grooves 11 are provided on both sides of the material-saving hole 10, so that the rotor punchings are riveted and fastened together.

[0027] An arc-shaped portion 12 is formed at one end of the core block 3, and magnet support portions 13 are formed on both sides of the arc-shaped portion 12. An acute-angled portion 14 is formed at the other end of the core block 3, and magnet support portions 15 are formed on both sides of the acute-angled portion 14. The magnetic groove 5 is formed between the magnet support portion 13 and the magnet support portion 15 to limit and fix the magnetic tile 4.

[0028] A thermal break bridge 16 is provided between the rotating shaft 1 and the rotor punching 2, and the air gap there is enlarged by filling with plastic parts, so that a closed magnetic circuit cannot be formed between the rotor punchings, thereby ensuring an excellent magnetic isolation effect, avoiding or weakening the occurrence of local magnetic leakage, reducing heat loss, lowering the temperature of the motor, and improving the motor performance.

[0029] 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 illustrative of the principles of 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 are intended to fall within the scope of the present invention. The scope of protection claimed in this invention is defined by the appended claims and their equivalents.

Claims

1. An integrated rotor core combining rotor punchings and a rotating shaft by plastic coating, characterized in that: The invention comprises a rotating shaft (1) and a stacked rotor sheet (2). The rotor sheet (2) comprises a plurality of iron core segments (3). The plurality of iron core segments (3) are arranged at intervals along the axis of the rotating shaft (1). A magnetic groove (5) for mounting a magnetic tile (4) is formed between every two adjacent iron core segments (3). A plastic coating (6) is formed between the rotor sheet (2), the magnetic tile (4) and the rotating shaft (1). The upper and lower end surfaces of the plastic coating (6) are respectively provided with anti-shrinkage grooves (7). The anti-shrinkage grooves (7) are located between the rotating shaft (1) and the rotor sheet (2).

2. The integrated rotor core comprising rotor punchings and a rotating shaft bonded together by plastic overmolding according to claim 1, characterized in that: A side wall 1 (8) is formed on one side of the anti-shrinkage groove (7), and a material thickness of 1-4 mm is provided between the side wall 1 (8) and the rotating shaft (1).

3. The integrated rotor core comprising a rotor punching and a rotating shaft bonded by plastic overmolding according to claim 1 or 2, characterized in that: A second side wall (9) is formed on the other side of the anti-shrinkage groove (7), and a material thickness of 1-4 mm is provided between the second side wall (9) and the magnetic tile (4).

4. The integrated rotor core comprising rotor punchings and a rotating shaft bonded together by plastic overmolding according to claim 3, characterized in that: A material thickness of 1-4 mm is provided between the upper and lower anti-shrinkage grooves (7).

5. The integrated rotor core comprising rotor punchings and a rotating shaft bonded together by plastic overmolding according to claim 1, wherein: A material-saving hole (10) is provided in the core block (3), and buckle grooves (11) are respectively provided on both sides of the material-saving hole (10).

6. The integrated rotor core comprising rotor punchings and a rotating shaft bonded together by plastic overmolding according to claim 1, characterized in that: One end of the core block (3) is formed with an arc portion (12), and two sides of the arc portion (12) are respectively formed with a first magnet support portion (13); the other end of the core block (3) is formed with an acute angle portion (14), and two sides of the acute angle portion (14) are respectively formed with a second magnet support portion (15).

7. The integrated rotor core comprising rotor punchings and a rotating shaft bonded together by plastic overmolding according to claim 1, characterized in that: A broken bridge (16) is provided between the rotating shaft (1) and the rotor punching sheet (2).

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