Iron core structure for separating rotor punching sheet from axis by magnetic shield

Abstract

The utility model belongs to the technical field of motors, and particularly relates to an iron core structure for separating a rotor punching sheet from an axis by a magnetic shield, which comprises a laminated rotor punching sheet, a laminated rotor axis and a magnetic shield, the rotor punching sheet comprises a plurality of iron core splicing blocks, and one end of each iron core splicing block far away from the rotor axis is provided with a support part I; the periphery of the rotor axis is provided with a magnetic isolation sleeve, the periphery of the magnetic isolation sleeve is provided with a supporting part II, and the supporting part I and the supporting part II are respectively located at the two ends of the permanent magnet groove so as to support the permanent magnet. The structural strength of connection among all parts is improved, the local magnetic leakage phenomenon is reduced, and through the interval design of the broken bridges between the rotor punching sheets and the rotor rotating shaft, the air gaps at the positions are increased, so that closed magnetic circuits cannot be formed among all the rotor punching sheets, the excellent magnetic isolation effect is ensured, the local magnetic leakage phenomenon is avoided or weakened, and the service life of the rotor is prolonged. The heat loss is reduced, and the motor performance is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of motors, in particular to an iron core structure that separates a rotor punching sheet from an axis with a magnetic isolation sleeve. Background Technique

[0002] To meet the current needs of household appliances, motors are developing towards high power density. Due to its characteristics such as high efficiency, high power density, and fast response, permanent magnet synchronous motors are widely used in the field of household appliances.

[0003] In order to achieve the characteristic of high power density and ensure structural strength in production and manufacturing and facilitate production, the currently widely used form of cooperation between punching sheets and permanent magnets is: in the built-in type, the permanent magnets are inserted into the rotor iron core stacked by punching sheets to achieve better motor performance. Structurally, a separated structure of the rotor iron core axis and the iron core punching sheet is adopted, and the permanent magnets are inserted into the permanent magnet slots of the rotor body stacked by punching sheets, that is, the iron core punching sheets of the rotor iron core are not directly connected to each other, but by filling a plastic-coated material between the punching sheets of each rotor iron core and the rotor iron core axis, the punching sheets of the rotor iron core, the rotor iron core axis, and the permanent magnets are plastically coated and connected into one body. The separated structure of the rotor iron core axis and the iron core punching sheet can reduce magnetic leakage and achieve the effect of improving motor performance.

[0004] Since it is necessary to hold the permanent magnets, a support part for holding the permanent magnets needs to be reserved on the punching sheet structure. This part of the support part inevitably increases the generation of magnetic leakage, so this structure needs to be further improved. Content of the Utility Model

[0005] The purpose of the utility model is to provide an iron core structure that separates a rotor punching sheet from an axis with a magnetic isolation sleeve, and solves the problem of excessive magnetic leakage through the magnetic isolation sleeve.

[0006] The purpose of the utility model is realized in this way: an iron core structure that separates a rotor punching sheet from an axis with a magnetic isolation sleeve, including stacked rotor punching sheets, a stacked rotor axis, and a magnetic isolation sleeve. The rotor punching sheet includes several iron core segments, and the several iron core segments are arranged at intervals in the circumferential direction of the rotor axis. A permanent magnet slot for installing a permanent magnet is formed between every two adjacent iron core segments. A first support part is formed at one end of the iron core segment away from the rotor axis. The magnetic isolation sleeve is installed on the outer periphery of the rotor axis, and a second support part is formed on the outer periphery of the magnetic isolation sleeve. The first support part and the second support part are respectively located at both ends of the permanent magnet slot to support the permanent magnet.

[0007] Preferably, a plastic-coated part is formed on the outer periphery of the permanent magnet and the rotor punching sheet.

[0008] Preferably, several buckling grooves two are opened in the rotor axis, and a connection strengthening part is formed on the outer periphery of the rotor axis.

[0009] Preferably, the iron core segments are triangular.

[0010] Preferably, a material-saving hole is formed in the iron core segment.

[0011] Preferably, two first fastening grooves are formed in the iron core segment, and the two first fastening grooves are respectively located on both sides of the material-saving hole.

[0012] Preferably, the magnetic isolation sleeve is in a hollow cylindrical shape.

[0013] The prominent and beneficial technical effects of the present utility model compared with the prior art are as follows:

[0014] In the present utility model, the magnetic isolation sleeve is sleeved on the outer periphery of the rotor axis to position the permanent magnet by the outer periphery of the magnetic isolation sleeve, improve the structural strength of the connection between components and reduce the generation of local magnetic leakage. Moreover, through the interval design of the broken bridge between the rotor punching sheet and the rotor shaft, the air gap at this place is increased, so that a closed magnetic circuit cannot be formed between the rotor punching sheets, ensuring an excellent magnetic isolation effect, avoiding or weakening the generation of local magnetic leakage, reducing heat loss, lowering the temperature of the motor, and improving the performance of the motor. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 is a schematic structural view of the present utility model Figure 1 .

[0016] Figure 2 is a schematic structural view of the present utility model Figure 2 .

[0017] Figure 3 is a schematic structural view of the iron core segment and the rotor axis.

[0018] Figure 4 is a schematic structural view of the magnetic isolation sleeve and the rotor axis Figure 1 .

[0019] Figure 5 is a schematic structural view of the magnetic isolation sleeve and the rotor axis Figure 2 .

[0020] Reference numerals: 1 - rotor punching sheet; 2 - rotor axis; 3 - magnetic isolation sleeve; 4 - iron core segment; 5 - permanent magnet; 6 - permanent magnet groove; 7 - first support part; 8 - plastic coating; 9 - second support part; 10 - second fastening groove;

[0021] 11 - connection strengthening part; 12 - material-saving hole; 13 - first fastening groove. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0022] The following further details the specific embodiments of the present utility model in conjunction with the drawings.

[0023] As Figures 1-5As shown in the figure, a core structure that separates the rotor punching from the axis with a magnetic isolation sleeve, including laminated rotor punchings 1, laminated rotor axles 2, and a magnetic isolation sleeve 3. The rotor punching 1 includes several core segments 4, and several core segments 4 are arranged at intervals along the circumferential direction of the rotor axle 2. A permanent magnet slot 6 for installing a permanent magnet 5 is formed between every two adjacent core segments 4. One end of the core segment 4 away from the rotor axle 2 is formed with a first support portion 7. A magnetic isolation sleeve 3 is installed on the outer periphery of the rotor axle 2, and a second support portion 9 is formed on the outer periphery of the magnetic isolation sleeve 3. The first support portion 7 and the second support portion 9 are respectively located at both ends of the permanent magnet slot 6 to support the permanent magnet 5.

[0024] In the utility model, the magnetic isolation sleeve is sleeved on the outer periphery of the rotor axle to position the permanent magnet at the outer periphery of the magnetic isolation sleeve, improve the structural strength of the connection between components and reduce the generation of local magnetic leakage. And through the interval design of the broken bridge between the rotor punching and the rotor shaft, the air gap at this place is increased, so that a closed magnetic circuit cannot be formed between the rotor punchings, ensuring excellent magnetic isolation effect, avoiding or weakening the generation of local magnetic leakage, reducing heat loss, lowering the temperature of the motor, and improving the performance of the motor.

[0025] A plastic coating 8 is formed on the outer periphery of the permanent magnet 5 and the rotor punching 1, and the core body and the plastic coating are integrally formed. Each component is tightly connected into one body through the PBT plastic coating forming process. Thimble holes are provided on the surface of the plastic coating for demoulding after plastic coating forming.

[0026] Several second fastening grooves 10 are formed in the rotor axle 2 to fixedly connect several laminated rotor axles 2. A connection strengthening portion 11 is formed on the outer periphery of the rotor axle 2. The connection strengthening portion 11 includes a boss or a groove, thereby strengthening the strength of the plastic coating and preventing the magnetic isolation sleeve from rotating circumferentially after being sleeved into the rotor axle 2.

[0027] The core segment 4 is triangular.

[0028] The core segment 4 is provided with a material-saving hole 12 on the premise of not affecting the magnetic performance, thereby reducing the overall weight.

[0029] Two first fastening grooves 13 are formed in the core segment 4, and the two first fastening grooves 13 are respectively located on both sides of the material-saving hole 12 for fixing several laminated core segments 4.

[0030] The magnetic isolation sleeve 3 is in the shape of a hollow cylinder.

[0031] The foregoing has shown and described the basic principles, main features, and advantages of the present utility model. Those skilled in the art should understand that the present utility model is not limited by the above embodiments. What is described in the above embodiments and the specification only illustrates the principles of the present utility model. Without departing from the spirit and scope of the present utility model, the present utility model will have various changes and improvements, and these changes and improvements all fall within the scope of the present utility model claimed. The scope of protection claimed for the present utility model is defined by the appended claims and their equivalents.

Claims

1. An iron core structure with a magnetic isolation sleeve separating the rotor punching and the shaft core, characterized in that: The invention comprises a stacked rotor sheet (1), a stacked rotor shaft (2) and a magnetic isolation sleeve (3). The rotor sheet (1) comprises a plurality of core blocks (4). The plurality of core blocks (4) are arranged at intervals along the circumferential direction of the rotor shaft (2). A permanent magnet slot (6) for mounting a permanent magnet (5) is formed between every two adjacent core blocks (4). A support part 1 (7) is formed at one end of the core block (4) away from the rotor shaft (2). A magnetic isolation sleeve (3) is mounted on the outer periphery of the rotor shaft (2). A support part 2 (9) is formed on the outer periphery of the magnetic isolation sleeve (3). The support part 1 (7) and the support part 2 (9) are respectively located at the two ends of the permanent magnet slot (6) to support the permanent magnet (5).

2. The core structure with a magnetic isolation sleeve separating the rotor punching and the shaft core according to claim 1, characterized in that: A plastic overmolding part (8) is formed on the outer periphery of the permanent magnet (5) and the rotor punching sheet (1).

3. The core structure with a magnetic isolation sleeve separating the rotor punching and the shaft core according to claim 1, characterized in that: A plurality of locking grooves (10) are provided in the rotor shaft (2), and a connection reinforcement portion (11) is formed on the outer periphery of the rotor shaft (2).

4. The core structure with a magnetic isolation sleeve separating the rotor punching and the shaft core according to claim 1, characterized in that: The iron core block (4) is triangular in shape.

5. The core structure with a magnetic isolation sleeve separating the rotor punching and the shaft core according to claim 1 or 4, characterized in that: A material-saving hole (12) is provided in the core block (4).

6. The core structure with a magnetic isolation sleeve separating the rotor punching and the shaft core according to claim 5, characterized in that: The core block (4) is provided with two buckling grooves (13), and the two buckling grooves (13) are respectively located on both sides of the material saving hole (12).

7. The core structure with a magnetic isolation sleeve separating the rotor punching and the shaft core according to claim 1, characterized in that: The magnetic isolation sleeve (3) is in the shape of a hollow cylinder.

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