Motor stator core and compressor

Abstract

The invention provides a motor stator core and a compressor, the stator core is cylindrical, the cylindrical stator core comprises a plurality of stacked first punching sheets, a heat dissipation flow channel is arranged between at least one group of adjacent first punching sheets, and the heat dissipation flow channel penetrates through the stator core along the radial direction. According to the invention, the heat dissipation area of the motor is increased, and the stator temperature rise is effectively reduced.

Description

Technical Field

[0001] The present invention relates to the field of compressors, and in particular to a motor stator core and a compressor. Background Art

[0002] During normal operation of the air-conditioning compressor motor, some energy will be lost in the form of heat, causing the temperature of the components to rise and forming a heat source.

[0003] As for the compressor motor stator, its heat sources are mainly the winding and the stator core. The winding is often the component with the highest temperature rise. Excessive temperature will cause the motor performance to decline, shorten its life, and even directly cause the motor to burn out.

[0004] As the power density of air-conditioning compressor motors continues to increase, the heat dissipation problem of the motors becomes more and more serious, especially in the windings in the stator slots. Due to the difficulty in heat dissipation, the stator temperature of the compressor motor can easily rise. Summary of the invention

[0005] In view of the problems in the prior art, an object of the present invention is to provide a motor stator core and a compressor with low temperature rise.

[0006] According to one aspect of the present invention, a motor stator core is provided, wherein the stator core is cylindrical in shape, the cylindrical stator core comprises a plurality of stacked first punching sheets, a heat dissipation channel is provided between at least one group of adjacent first punching sheets, and the heat dissipation channel penetrates the stator core in a radial direction.

[0007] Preferably, the heat dissipation channels located between one or more groups of adjacent first punching sheets evenly divide the stator core into multiple sections along the axial direction.

[0008] Preferably: a plurality of groups of spacers are embedded between at least one group of adjacent first punches, the plurality of groups of spacers are distributed along the circumferential direction of the first punches, the area of ​​the plurality of groups of spacers is smaller than that of the first punches, and the heat dissipation channel is formed by the non-overlapping areas of the plurality of groups of spacers and the first punches.

[0009] Preferably, each group of the spacers includes a plurality of stacked second punching sheets.

[0010] Preferably, a connection structure is provided on each of the first punching sheet and the second punching sheet, and the connection structure fixedly connects the stacked first punching sheets and the stacked second punching sheets.

[0011] Preferably, the stator core comprises a yoke portion and a tooth portion, and the spacer is arranged corresponding to the extending direction of the tooth portion.

[0012] Preferably, several groups of spacers are evenly distributed along the circumferential direction.

[0013] Preferably, the shortest distance between the outer edge of the spacer and the outer side surface of the yoke is no greater than 3 mm, and the shortest distance between the outer edge of the spacer and the inner side surface of the tooth is no greater than 3 mm.

[0014] Preferably, the thickness of each set of spacers is not less than 2 mm.

[0015] According to another aspect of the present invention, a compressor is provided, comprising the motor stator core according to the above.

[0016] The technical solution of the present invention provides a motor stator core and a compressor, which increase the heat dissipation area of ​​the motor and effectively reduce the temperature rise of the stator. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Other features, objectives and advantages of the present invention will become more apparent from a reading of the detailed description of non-limiting embodiments made with reference to the following accompanying drawings.

[0018] Figure 1 is a schematic diagram of the longitudinal section structure of the stator core of an embodiment of the present invention;

[0019] Figure 2 is a schematic cross-sectional structure diagram of a stator core according to an embodiment of the present invention;

[0020] Figure 3 is a schematic structural diagram of a second punching sheet according to an embodiment of the present invention;

[0021] Figure 4 Schematic diagram of the size structure of the stator core of an embodiment of the present invention;

[0022] Figure 5 It is a schematic cross-sectional structure diagram of a stator core assembled in a compressor according to an embodiment of the present invention.

[0023] Reference numerals

[0024] 1 Winding

[0025] 2 Stator core

[0026] 3 Heat dissipation channel

[0027] 4 First punch

[0028] 5 Spacers

[0029] 6 Second punch

[0030] 7 Punching connection structure

[0031] 8 First heat sink

[0032] 9 Housing DETAILED DESCRIPTION

[0033] Example embodiments will now be described more fully with reference to the accompanying drawings. However, example embodiments can be implemented in a variety of forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that the present invention will be comprehensive and complete and fully convey the concepts of the example embodiments to those skilled in the art. The same reference numerals in the figures represent the same or similar structures, and thus their repeated description will be omitted.

[0034] In an embodiment of the present invention, a motor stator core and a stator and a compressor having the same are provided.

[0035] like Figure 1 and Figure 2 As shown in FIG. , in an embodiment of the present invention, a motor is provided in the compressor.

[0036] The motor is provided with a stator and a rotor.

[0037] The stator is provided with a winding 1 and a stator core 2. The winding 1 is provided on the stator core 2.

[0038] The stator core 2 is cylindrical in shape. The cylindrical stator core 2 is hollowed out along the axial direction, and preferably has a shape similar to a hollow column.

[0039] Therefore, the surface of the stator core 2 includes a top surface, a bottom surface, an inner side surface, and an outer side surface.

[0040] The stator core 2 is cylindrical in shape and includes a plurality of stacked first punching sheets 4. A heat dissipation channel 3 is provided between at least one group of adjacent first punching sheets 4. The heat dissipation channel 3 passes through the stator core 2 in the radial direction.

[0041] The motor stator core and the compressor of the embodiment of the present invention open heat dissipation channels between the stacked punching sheets of the stator core, which can effectively increase the heat dissipation area of ​​the motor and significantly reduce the temperature rise of the stator.

[0042] And as Figure 1 As shown in , in the embodiment of the present invention, it is assumed that the shape of the stator core 2 is similar to a hollow cylinder with a height of L and inner and outer diameters of d2 and d1 respectively.

[0043] The effective heat dissipation surface of the motor in the prior art solution is the inner and outer diameters of the stator core 2 and the two core end faces, and its heat dissipation area is S1≈π / 4*(d1^2-d2^2)*2+π(d1+d2)*L.

[0044] In the embodiment of the present invention, N heat dissipation channels are added, and the heat dissipation area S2≈π / 4*(d1^2-d2^2)*(2+N)+π(d1+d2)*L.

[0045] Assume that the heat from loss is p and the heat transfer coefficient of the stator is k(W / (m 2 .K)). The stator temperature rise T1(K) of the prior art solution is T1=p / (k*S1), and the stator temperature rise T2(K) of the technical solution provided by the present invention is T2=p / (k*S2). Since S2>S1, T2<T1, the stator temperature rise can be effectively reduced by using the embodiment of the present invention, and as the number of heat dissipation channels increases, the effect of reducing the temperature rise is more obvious.

[0046] Furthermore, in the axial direction of the stator core 2, the heat dissipation channels 3 arranged between adjacent first punching sheets 4 form a group, and one or more groups of heat dissipation channels 3 divide the stator core 2 into multiple sections along the axial direction.

[0047] Optionally, one or more groups of heat dissipation channels 3 evenly divide the stator core 2 into multiple sections along the axial direction. Specifically, a group of heat dissipation channels 3 is arranged between a group of adjacent first punching sheets 4 located in the middle position of the stator core 2, and the stator core 2 is evenly divided into two sections. Alternatively, two groups of heat dissipation channels 3 are arranged between two groups of adjacent first punching sheets 4 located at 1 / 3 and 2 / 3 of the stator core 2, and the stator core 2 is evenly divided into three sections. In addition, the distribution of heat dissipation channels greater than two groups can be deduced accordingly. However, it should be noted that the present invention is not limited to the above-mentioned uniformly distributed arrangement, and its number and arrangement form can be adjusted according to the actual motor requirements and types.

[0048] like Figure 1 and Figure 2 As shown in, in an embodiment of the present invention, the stator core 2 preferably includes a first punching sheet 4 and a spacer 5 stacked on each other. The area of ​​the spacer 5 is smaller than that of the first punching sheet 4, and a heat dissipation channel 3 is formed by the non-overlapping area of ​​the spacer 5 and the first punching sheet 4. That is, the stator core 2 is preferably formed by stacking punching sheets, and a certain number of spacers 5 are embedded in the stamping and stacking process of the first punching sheet 4. Since the area of ​​the spacer 5 is smaller than that of the first punching sheet 4, a number of heat dissipation channels 3 are formed in the length direction of the stator core 2.

[0049] Please continue to see Figure 2 Preferably, the stator core 2 includes a yoke portion and a tooth portion, and the spacers 5 are arranged corresponding to the extending direction of the tooth portion. Several groups of spacers 5 are evenly distributed along the circumferential direction.

[0050] And preferably, each group of spacers 5 includes a plurality of stacked second punching sheets 6 .

[0051] In the embodiment of the present invention, it is preferred that the number of each group of spacers 5 between each two adjacent first punching sheets 4 may be two or more groups, such as Figure 2 In the embodiment shown, four groups of spacers 5 are provided between each two adjacent first punching sheets 4. The gap formed between two adjacent groups of spacers 5 can form the heat dissipation channel 3.

[0052] Preferably, the thickness of each group of spacers 5 is not less than 2 mm, that is, the width of the heat dissipation channel 3 is not less than 2 mm.

[0053] Continue to see Figure 2 , Figure 3 In the embodiment of the present invention, it is preferred that the first punching sheet 4 and the second punching sheet 6 are further provided with a punching sheet connecting structure 7, so that the punching sheets can be connected during the punching process.

[0054] Further preferably, Figure 4 As shown, the shortest distances b1, b2, b3 between the outer edge of the second punching sheet 6 and the inner side surface of the stator core 2, specifically the edge of the tooth portion, and the shortest distance b4 between the outer edge of the second punching sheet 6 and the outer side surface of the stator core 2, specifically the outer edge of the yoke portion are all greater than 0 and not greater than 3 mm.

[0055] Meanwhile, it is preferred that the distances a1, a2, a3, and a4 between the punching sheet connection structure 7 and the outer edge of the second punching sheet 6 are not less than 2 mm.

[0056] Example 1

[0057] like Figure 4 As shown in the figure, the first punching piece 4 is in the shape of a ring, and a tooth portion is provided inside. The second punching piece 6 is in the shape of a rectangle. One end of the second punching piece 6 is located at the tooth portion of the first punching piece 4, and the other end extends along the radial direction of the first punching piece 4.

[0058] The shortest distances b1, b2, b3 between the outer edge of the second punching sheet 6 and the inner side surface of the stator core 2, and the shortest distance b4 between the outer edge of the second punching sheet 6 and the outer side surface of the stator core 2 are all 3 mm.

[0059] The distances a1, a2, a3, and a4 between the punching sheet connection structure 7 and the outer edge of the second punching sheet 6 are all 2 mm.

[0060] Through simulation calculation, the stacking height of the motor punching sheets is set to 65mm, and the motor is a variable frequency motor with a rated power of 8Kw.

[0061] At the rated output point, when a 2 mm heat dissipation channel is set, that is, in the height direction, there is a group of second punching sheets 6 between a group of adjacent first punching sheets 4 and in the middle of the stator core, the maximum temperature of the motor winding drops by 5.4°C.

[0062] When two 2 mm heat dissipation channels are provided, that is, one set of second punching sheets 6 is provided at 1 / 3 and 2 / 3 of the height of the stator core, respectively, the maximum temperature of the motor winding drops by 8.3°C.

[0063] When a 4 mm heat dissipation slot is provided, that is, a group of 4 mm thick second punching sheets 6 is provided at the middle position of the height, the maximum temperature of the winding drops by 6.6°C.

[0064] like Figure 5 As shown, this embodiment also provides a compressor, including a housing 9 and a motor arranged in the housing 9, wherein the motor includes the above-mentioned stator core 2. The outer side surface of the stator core is provided with a hollowing out along the axial direction, and the hollowing out constitutes a first heat dissipation groove 8, and the inner side surface of the stator core surrounds the motor rotor, and the air gap between the inner side surface of the stator core and the rotor constitutes a second heat dissipation groove (not shown in the figure), and the heat dissipation channel 3 connects the first heat dissipation groove 8 and the second heat dissipation groove. The first heat dissipation groove 8 on the outer side of the stator core 2 and the housing 9 can be used for the circulation of the compressor refrigerant, and can also be used to connect with the heat dissipation channel 3 for heat dissipation.

[0065] In summary, the low-temperature-rise compressor motor stator core and the compressor of the embodiments of the present invention increase the heat dissipation area of ​​the motor and effectively reduce the stator temperature rise.

[0066] The above contents are further detailed descriptions of the present invention in combination with specific preferred embodiments, and it cannot be determined that the specific implementation of the present invention is limited to these descriptions. For ordinary technicians in the technical field to which the present invention belongs, several simple deductions or substitutions can be made without departing from the concept of the present invention, which should be regarded as falling within the protection scope of the present invention.

Claims

1. A motor stator core, characterized in that: The stator core is cylindrical in shape and comprises a plurality of stacked first punching sheets. A heat dissipation channel is provided between at least one group of adjacent first punching sheets, and the heat dissipation channel penetrates the stator core in a radial direction.

2. The motor stator core according to claim 1, characterized in that: The heat dissipation channels located between one or more groups of adjacent first punching sheets evenly divide the stator core into multiple sections along the axial direction.

3. The motor stator core according to claim 1, characterized in that: Several groups of spacers are embedded between at least one group of adjacent first punching sheets, and the several groups of spacers are distributed along the circumferential direction of the first punching sheets. The areas of the several groups of spacers are smaller than those of the first punching sheets, and the heat dissipation channels are formed by the non-overlapping areas of the several groups of spacers and the first punching sheets.

4. The motor stator core according to claim 3, characterized in that: Each group of the spacers includes a plurality of stacked second punching sheets.

5. The motor stator core according to claim 4, characterized in that: The first punching sheets and the second punching sheets are both provided with a connecting structure, and the connecting structure fixedly connects the stacked first punching sheets and the stacked second punching sheets.

6. The motor stator core according to claim 3, characterized in that: The stator core includes a yoke portion and a tooth portion, and the spacer is arranged corresponding to an extending direction of the tooth portion.

7. The motor stator core according to claim 3, characterized in that: Several groups of spacers are evenly distributed along the circumferential direction.

8. The motor stator core according to claim 6, characterized in that: The shortest distance between the outer edge of the spacer and the outer side surface of the yoke is no greater than 3 mm, and the shortest distance between the outer edge of the spacer and the edge of the tooth is no greater than 3 mm.

9. The motor stator core according to claim 3, characterized in that: The thickness of each group of spacers is not less than 2 mm.

10. A compressor, characterized in that: It comprises the motor stator core as claimed in any one of claims 1 to 9.

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