CN220544764U - Rotor structure and motor with same - Google Patents

Abstract

The utility model provides a rotor structure and a motor with the same, wherein the rotor structure comprises: rotor core (1), be provided with a plurality of refrigerant hole group (10) on rotor core (1), a plurality of refrigerant hole group (10) set up evenly along the axial interval of rotor core (1), each refrigerant hole group (10) all include a plurality of circulation holes, include at least one first circulation hole (100) and at least one second circulation hole (110) in a plurality of circulation holes, first circulation hole (100) and second circulation hole (110) distribute on having two circumferences of different distances with the centre of a circle of rotor core (1), the line between first circulation hole (100) and the centre of a circle and the line between second circulation hole (110) and the centre of a circle have and predetermine the contained angle ground setting, the diameter of first circulation hole (100), the diameter of second circulation hole (110) all is less than predetermine the target value ground and set up in order to solve the not good problem of the working property of compressor among the prior art.

Description

Rotor structure and motor with same

Technical Field

The utility model relates to the technical field of motor structural design, in particular to a rotor structure and a motor with the same.

Background

With the continuous improvement of energy efficiency standards, the improvement of the energy efficiency level of the variable-frequency household air conditioner compressor becomes an important subject in the research field.

In a compressor motor, the rotor flow bore forms part of the compressor internal oil circulation circuit, the shape and size of which have a significant effect on the oil circuit circulation flow direction of the compressor, thereby directly affecting the overall performance of the compressor. The flow holes are too large or too small, which has adverse effect on the performance of the compressor, and are specifically shown as follows: when the rotor flow hole is too large, the oil discharge rate of the compressor is increased, so that the compressor is used for discharging oil, and the discharge temperature measured by partial working conditions is lower and is similar to the condensation temperature, so that the performance of the point is affected; too small a rotor flow hole can seriously slow down the flow rate of an oil way and deteriorate the performance. The diameters of the shaft holes of the compressors with different displacement are different, and the sizes of the shaft holes with different diameters are also considered when designing the flow holes.

The overall performance of the existing compressor is low, and how to improve the working performance of the compressor on the premise of preventing the compressor from exhausting with oil becomes an unsolved technical problem.

Disclosure of Invention

The utility model mainly aims to provide a rotor structure and a motor with the rotor structure, so as to solve the problem of poor working performance of a compressor in the prior art.

In order to achieve the above object, according to one aspect of the present utility model, there is provided a rotor structure comprising: the rotor core is provided with a plurality of refrigerant hole groups, the refrigerant hole groups are uniformly arranged along the circumferential direction interval of the rotor core, each refrigerant hole group comprises a plurality of flow holes, each flow hole comprises at least one first flow hole and at least one second flow hole, the first flow holes and the second flow holes are distributed on two circumferences with different distances from the circle center of the rotor core, a connecting line between the first flow holes and the circle center and a connecting line between the second flow holes and the circle center are arranged in a preset included angle manner, and the diameters of the first flow holes and the second flow holes are both smaller than a preset target value.

Further, at least one of the first flow hole and the second flow hole has a diameter d, wherein d is not less than 4.24mm.

Further, the number of the first flow holes is one, the number of the second flow holes is two, the first flow holes are located on the first circumference, the two second flow holes are arranged on the second circumference at intervals, the first circumference is located on the inner side of the second circumference, an included angle formed by connecting lines between the two second flow holes and the circle center is a first included angle, and an angle bisector of the connecting line between the first flow holes and the circle center coincides with the first included angle.

Further, the diameter of the first flow hole is set to be the same as the diameter of the second flow hole, and the diameter of the first flow hole is d, wherein d is more than or equal to 5.7mm and less than or equal to 6.3mm.

Further, the diameter of the first flow hole and the diameter of the second flow hole are set differently, and the diameter of the first flow hole is smaller than the diameter of the second flow hole.

Further, a plurality of rivet holes are formed in the rotor core, the number of the rivet holes is the same as that of the refrigerant hole groups, one rivet hole is formed between any two adjacent refrigerant hole groups, and at least part of circular outlines of the rivet holes are overlapped with the second circumference.

Further, each refrigerant hole group further comprises a plurality of third flow holes, the plurality of third flow holes are arranged in one-to-one correspondence with the plurality of second flow holes, the plurality of third flow holes are arranged on a third circumference at intervals, the third circumference is positioned on the inner side of the first circumference, the diameter of the third flow holes is identical to that of the second flow holes, and the diameter of the third flow holes is larger than that of the first flow holes.

Further, the number of the third through holes is two, the circle center of one third through hole and the circle center of the second through hole corresponding to the third through hole are positioned on the same straight line, and the circle center of the other third through hole and the circle center of the second through hole corresponding to the third through hole are positioned on the other straight line.

Further, the first flow hole and the second flow hole are each provided penetrating the rotor core in the axial direction of the rotor core.

According to an aspect of the present utility model, there is provided an electric machine comprising a rotor structure, the rotor structure being the rotor structure described above.

By adopting the technical scheme of the utility model, the structure of the flow holes on the rotor core is improved, so that the function of accelerating the circulation rate of the refrigerant of the compressor is achieved, the refrigerant can rapidly and uniformly cool the rotor core, the function of improving the performance of the compressor is further achieved, and the design of the rotor core is facilitated to be simplified. Meanwhile, the diameters of the first flow holes and the second flow holes are limited, so that the flow area of the rotor is controlled in a reasonable range, and the problems of oil-carrying exhaust and low exhaust temperature caused by overlarge flow area in the operation of the motor are avoided. By adopting the technical scheme, the problem of poor working performance of the compressor in the prior art is effectively solved.

Drawings

The accompanying drawings, which are included to provide a further understanding of the utility model and are incorporated in and constitute a part of this specification, illustrate embodiments of the utility model and together with the description serve to explain the utility model. In the drawings:

fig. 1 shows a schematic structural view of a first embodiment of a rotor structure according to the utility model;

fig. 2 shows a schematic structural view of a second embodiment of a rotor structure according to the utility model;

fig. 3 shows a schematic structural view of a rotor core in the prior art;

fig. 4 shows a schematic structural view of a third embodiment of a rotor structure according to the utility model;

fig. 5 shows a schematic structural view of a fourth embodiment of a rotor structure according to the utility model;

fig. 6 shows a schematic diagram of the energy efficiency of an electric machine employing the rotor structure of the present utility model in comparison to a prior art electric machine.

Wherein the above figures include the following reference numerals:

1. a rotor core; 2. a first circumference; 3. a second circumference; 10. a refrigerant hole group; 11. rivet hole; 100. a first flow hole; 110. and a second flow hole.

Detailed Description

It should be noted that, in the case of no conflict, the embodiments and features in the embodiments may be combined with each other. The utility model will be described in detail below with reference to the drawings in connection with embodiments.

It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments in accordance with the present application. As used herein, the singular is also intended to include the plural unless the context clearly indicates otherwise, and furthermore, it is to be understood that the terms "comprises" and/or "comprising" when used in this specification are taken to specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof.

It should be noted that the terms "first," "second," and the like in the description and claims of the present application and the above figures are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the terms so used are interchangeable under appropriate circumstances such that the embodiments of the application described herein are, for example, capable of operation in sequences other than those illustrated or otherwise described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.

Exemplary embodiments according to the present application will now be described in more detail with reference to the accompanying drawings. These exemplary embodiments may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. It should be understood that these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of these exemplary embodiments to those skilled in the art, that in the drawings, it is possible to enlarge the thicknesses of layers and regions for clarity, and that identical reference numerals are used to designate identical devices, and thus descriptions thereof will be omitted.

As shown in connection with fig. 1-2 and fig. 4-6, a rotor structure is provided according to an embodiment of the present application.

The rotor structure comprises a rotor core 1. The rotor core 1 is provided with a plurality of refrigerant hole groups 10, the plurality of refrigerant hole groups 10 are uniformly arranged along the circumferential direction interval of the rotor core 1, each refrigerant hole group 10 comprises a plurality of flow holes, the plurality of flow holes comprise at least one first flow hole 100 and at least one second flow hole 110, the first flow holes 100 and the second flow holes 110 are distributed on two circumferences with different distances from the circle center of the rotor core 1, a connecting line between the first flow holes 100 and the circle center and a connecting line between the second flow holes 110 and the circle center are arranged in a preset included angle, and the diameters of the first flow holes 100 and the second flow holes 110 are smaller than preset target values.

By means of the technical scheme, through improving the structure of the upper flow holes of the rotor core 1, the cooling medium circulation rate of the compressor is accelerated, cooling operation is rapidly and uniformly performed on the rotor core 1, the performance of the compressor is improved, and the design of the rotor core 1 is simplified. Meanwhile, the diameters of the first flow holes 100 and the second flow holes 110 are limited, so that the flow area of the rotor is controlled in a reasonable range, and the problems of oil-carrying exhaust and low exhaust temperature caused by overlarge flow area when the motor operates are avoided. By adopting the technical scheme, the problem of poor working performance of the compressor in the prior art is effectively solved.

In one particular embodiment, as shown in fig. 1, the rotor structure is a permanent magnet motor rotor for a home air conditioner compressor. The rotor is formed by laminating punching sheets. The punching sheet is provided with 9 circular flow holes with the same size as the refrigerant flow channels during the operation of the compressor. The flow holes are uniformly distributed in three groups along a circle concentric with the shaft hole. The 2 circulation holes in each group are uniformly distributed on the outer side, the remaining 1 circulation hole is uniformly distributed on the inner side, and each circulation hole on the inner side is positioned on a bisector of an angle formed by the axle center and the circle centers of the other two circulation holes in each group, so that an abdicating effect is formed.

Further, at least one of the first and second flow holes 100, 110 has a diameter d, wherein d is 4.24mm or more. As shown in fig. 1, to ensure that the flow holes are independent of each other and ensure strength, the diameter d of the holes satisfies d < 8, and the minimum flow area S '=127 square millimeters of the conventional core of the same specification, in this embodiment, the core flow area should satisfy S > S', and d >4.24mm. Fig. 3 is a schematic diagram showing a structure of a rotor core of the same size in which a conventional flow area is minimized.

Further, the number of the first through holes 100 is one, the number of the second through holes 110 is two, the first through holes 100 are located on the first circumference 2, the two second through holes 110 are arranged on the second circumference 3 at intervals, the first circumference 2 is located on the inner side of the second circumference 3, an included angle formed by connecting lines between the two second through holes 110 and the circle center is a first included angle, and an angle bisector of the first included angle coincides with the connecting line between the first through holes 100 and the circle center. The working performance of the compressor can be effectively improved through the arrangement.

Further, the diameter of the first flow hole 100 and the diameter of the second flow hole 110 are set to be the same, and the diameter of the first flow hole 100 is d, wherein d is 5.7 mm.ltoreq.d.ltoreq.6.3 mm. In this embodiment, flow-through Kong Zuiyou diameterIn practical design, the design range of the aperture d falls near d0, and the size is 5.7mm < d < 6.3mm, so that the optimal performance can be obtained.

Further, the diameter of the first flow hole 100 and the diameter of the second flow hole 110 are differently set, and the diameter of the first flow hole 100 is smaller than the diameter of the second flow hole 110.

As shown in fig. 1 and 2, the diameter d' of the second flow hole 110 in fig. 2 is larger than the diameter d of the second flow hole 110 in fig. 1.

Further, a plurality of rivet holes 11 are formed in the rotor core 1, the number of the rivet holes 11 is the same as that of the refrigerant hole groups 10, one rivet hole 11 is formed between any two adjacent refrigerant hole groups 10, and at least part of circular outline of the rivet hole 11 coincides with the second circumference 3. The arrangement of the cooling holes can be prevented from being interfered, and the cooling effect is ensured.

The through holes are designed to be independent of each other and do not interfere with the rivet holes, and the structural strength of the rotor is guaranteed, so that the aperture is limited. In combination with the rotor structure and space constraints, the diameter d of the hole satisfies d < 8. The structure of the rotor core with the smallest flow area in the existing rotor with the same specification is shown in fig. 3, the flow holes are 3D-shaped structures, and the flow area is S' approximatelyequal to 127 square millimeters. When the compressor is running, too small a flow hole area can affect the flow velocity of the refrigerant in the rotor when the refrigerant is discharged out of the compressor through the exhaust port, so that the energy efficiency is reduced, and the flow area S of the rotor in the embodiment is used for ensuring the performance>S', correspondingly has

Further, each refrigerant hole group 10 further includes a plurality of third through holes, which are disposed in one-to-one correspondence with the plurality of second through holes 110, the plurality of third through holes are disposed on a third circumference at intervals, the third circumference is located inside the first circumference 2, the diameter of the third through holes is the same as the diameter of the second through holes 110, and the diameter of the third through holes is larger than the diameter of the first through holes 100. The arrangement can cool the part with more heat of the rotor, improve the cooling accuracy and reduce the energy consumption.

Further, the number of the third through holes is two, the circle center of one third through hole and the circle center of the second through hole 110 corresponding to the third through hole are positioned on the same straight line, and the circle center of the other third through hole and the circle center of the second through hole 110 corresponding to the third through hole are positioned on the other straight line.

Further, the first and second flow holes 100 and 110 are each provided penetrating the rotor core 1 in the axial direction of the rotor core 1.

Fig. 4 and 5 show two different flow area schemes of rotor laminations, scheme 1 of fig. 4. Scheme 2 of fig. 5. The rotor flow area s=2s 'in scheme 1, s=3s' in scheme 2, and the pore size d all meet the above-mentioned size limitation requirements. The two punched sheets are identical in structure except for the size of the flow holes. That is, fig. 4 is a schematic structural view of the structure of the inner rotor in which the diameter of the flow hole is in the optimum design range. At this time, d=6mm, s=2s'. Fig. 5 is a schematic structural diagram of the structure of the rotor with the flow hole diameter in the non-optimal design range, where d=7.5 mm and s=3s'.

By performing four-point compressor performance tests under different national standards on the rotor structure shown in fig. 4, the rotor structure shown in fig. 5 and the rotor structure of the prior art shown in fig. 3, data such as energy efficiency, suction and exhaust temperature, current and the like of the compressor are observed, and an energy efficiency comparison chart shown in fig. 6 is obtained. Fig. 6 shows a comparison of performance of the prior art scheme and the scheme of the two embodiments of the present utility model, and it can be seen from the energy efficiency ratio in the graph that the performance of each point of the rotor shown in the embodiment is improved compared with the prior art scheme after the rotor is tested by the installation machine. However, when the compressor (s=3s') with a larger rotor flow area is operated, the oil circulation rate of the compressor increases, and when the compressor is operated near the critical frequency (such as the intermediate heating working condition in the figure) of the controller torque compensation start-stop, the phenomenon of exhausting with oil occurs, so that the performance of the compressor near the frequency point is affected, and the energy efficiency ratio is reduced. There is a most reasonable range of flow areas for the rotor. As can be seen from fig. 6, when the value of the rotor flow area S is in the vicinity of 2S', the performance effect is optimal and the reliability is the strongest.

According to a specific embodiment of the present utility model, there is provided an electric machine including a rotor structure, which is the rotor structure in the above embodiment.

From the above description, it can be seen that the above embodiments of the present utility model achieve the following technical effects: the problem of low overall performance of the existing compressor is solved by improving the flow hole structure; the rotor flow hole size is limited on the basis of improving the flow hole structure, so that the control flow area is achieved, and the abnormality of an oil way is avoided.

Spatially relative terms, such as "above … …," "above … …," "upper surface at … …," "above," and the like, may be used herein for ease of description to describe one device or feature's spatial location relative to another device or feature as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements described as "above" or "over" other devices or structures would then be oriented "below" or "beneath" the other devices or structures. Thus, the exemplary term "above … …" may include both orientations of "above … …" and "below … …". The device may also be positioned in other different ways (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.

In addition to the foregoing, references in the specification to "one embodiment," "another embodiment," "an embodiment," etc., mean that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment described in general terms in the application. The appearances of the phrase in various places in the specification are not necessarily all referring to the same embodiment. Further, when a particular feature, structure, or characteristic is described in connection with any embodiment, it is intended that such feature, structure, or characteristic be implemented within the scope of the utility model.

In the foregoing embodiments, the descriptions of the embodiments are emphasized, and for parts of one embodiment that are not described in detail, reference may be made to related descriptions of other embodiments.

The above description is only of the preferred embodiments of the present utility model and is not intended to limit the present utility model, but various modifications and variations can be made to the present utility model by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present utility model should be included in the protection scope of the present utility model.

Claims (10)

1. A rotor structure, comprising:

rotor core (1), be provided with a plurality of refrigerant hole group (10) on rotor core (1), a plurality of refrigerant hole group (10) are followed rotor core (1) circumference interval evenly sets up, each refrigerant hole group (10) all include a plurality of circulation holes, a plurality of include at least one first circulation hole (100) and at least one second circulation hole (110) in the circulation hole, first circulation hole (100) with second circulation hole (110) distribute on two circumferences that have different distances with rotor core (1) the centre of a circle, line between first circulation hole (100) with the centre of a circle with line between second circulation hole (110) with the centre of a circle has and presets the contained angle ground to set up, the diameter of first circulation hole (100) the diameter of second circulation hole (110) all is less than presets the target value ground and sets up.

2. The rotor structure according to claim 1, wherein at least one of the first and second flow holes (100, 110) has a diameter d, wherein d is equal to or greater than 4.24mm.

3. The rotor structure according to claim 1, wherein the number of the first flow holes (100) is one, the number of the second flow holes (110) is two, the first flow holes (100) are located on a first circumference (2), the two second flow holes (110) are arranged on a second circumference (3) at intervals, the first circumference (2) is located on the inner side of the second circumference (3), an included angle formed by connecting lines between the two second flow holes (110) and the circle centers is a first included angle, and an angle bisector of the first included angle is overlapped by connecting lines between the first flow holes (100) and the circle centers.

4. The rotor structure according to claim 1, characterized in that the diameter of the first flow hole (100) and the diameter of the second flow hole (110) are set identically, the diameter of the first flow hole (100) being d, wherein 5.7 mm.ltoreq.d.ltoreq.6.3 mm.

5. The rotor structure according to claim 1, characterized in that the diameter of the first flow hole (100) and the diameter of the second flow hole (110) are provided differently, and the diameter of the first flow hole (100) is smaller than the diameter of the second flow hole (110).

6. A rotor structure according to claim 3, characterized in that a plurality of rivet holes (11) are provided on the rotor core (1), the number of rivet holes (11) is the same as the number of refrigerant hole groups (10), one rivet hole (11) is provided between any two adjacent refrigerant hole groups (10), and at least part of circular outline of the rivet hole (11) coincides with the second circumference (3).

7. A rotor structure according to claim 3, wherein each of the refrigerant hole groups (10) further includes a plurality of third flow holes, the plurality of third flow holes being provided in one-to-one correspondence with the plurality of second flow holes (110), the plurality of third flow holes being provided at intervals on a third circumference, the third circumference being located inside the first circumference (2), the diameter of the third flow holes being provided the same as the diameter of the second flow holes (110), and the diameter of the third flow holes being larger than the diameter of the first flow holes (100).

8. The rotor structure according to claim 7, wherein the number of the third through holes is two, the center of one of the third through holes and the center of the second through hole (110) corresponding to the third through hole are located on the same straight line, and the center of the other of the third through holes and the center of the second through hole (110) corresponding to the third through hole are located on the other straight line.

9. The rotor structure according to claim 1, characterized in that the first and second flow holes (100, 110) are each provided through the rotor core (1) in an axial direction of the rotor core (1).

10. An electric machine comprising a rotor structure according to any one of claims 1 to 9.