Motor rotor, motor and compressor

Abstract

The utility model provides a motor rotor, a motor and a compressor, the motor rotor comprises a rotor iron core, the rotor iron core is provided with a circulation hole extending along the axial direction of the rotor iron core in a penetrating manner, and the circulation hole comprises a first hole section and a second hole section which are alternately arranged along the axial direction of the circulation hole; in the same circulation hole, at least one second hole section is located between the two first hole sections, the cross section of the second hole section is larger than that of the first hole section, and the axial size of the second hole section is larger than that of the first hole section. The motor rotor is applied to a motor, and the motor can be applied to a compressor. Due to the arrangement mode of the circulation holes, the circulation holes have a good silencing effect, and noise generated during operation of the compressor is reduced.

Description

Technical Field

[0001] The utility model belongs to the technical field of motors, and particularly relates to a motor rotor, a motor and a compressor. Background Art

[0002] A kidney-shaped flow hole is formed in the rotor core of the motor rotor to increase the flow area of the refrigerant. In the prior art, the cross-section of the flow hole remains constant throughout its entire axial length. When the refrigerant flows through this type of flow hole, low-frequency noise is generated and it is easy to excite the cavity mode, resulting in a further increase in noise. Summary of the Utility Model

[0003] The purpose of the utility model is to provide a motor rotor, a motor and a compressor to solve the noise problem generated during the operation of the motor rotor in the prior art.

[0004] To achieve the above purpose, the utility model provides a motor rotor, including a rotor core, and a flow hole extending axially through the rotor core. The number of the flow holes is multiple, and the multiple flow holes are arranged at intervals along the circumferential direction of the rotor core; the flow hole includes a first hole section and a second hole section arranged alternately along its axial direction; in the same flow hole, at least one second hole section is located between two first hole sections, the cross-section of the second hole section is larger than that of the first hole section, and the axial dimension of the second hole section is larger than that of the first hole section.

[0005] Optionally, the number of the first hole sections in the same flow hole is more than that of the second hole sections.

[0006] Optionally, the ratio of the axial dimension of the first hole section in the same flow hole to the axial dimension of the flow hole is greater than or equal to 1 / 20 and less than or equal to 1 / 3.

[0007] Optionally, the ratio of the area of the cross-section of the first hole section in the same flow hole to the area of the cross-section of the second hole section is less than or equal to 1 / 5.

[0008] Optionally, the flow hole includes more than three first hole sections and more than two second hole sections, and the ratio of the axial dimension of the first hole section located between two second hole sections to the axial dimension of the first hole section adjacent to one second hole section is greater than or equal to 5 / 6 and less than or equal to 1.

[0009] Optionally, the flow hole includes more than three first hole sections and more than two second hole sections, and the ratio of the area of the cross-section of the first hole section located between two second hole sections to the area of the cross-section of the first hole section adjacent to one second hole section is greater than or equal to 1 and less than or equal to 3.

[0010] Optionally, the flow holes include more than three of the first hole segments and more than two of the second hole segments, and the ratio of the axial dimensions of any two specified second hole segments is greater than or equal to 1 and less than or equal to 3; the specified second hole segment is located between two of the first hole segments.

[0011] Optionally, the motor rotor includes a plurality of laminations stacked along its axis; the first hole segment penetrates at least five of the laminations.

[0012] To achieve the above object, the present utility model further provides a motor, including the motor rotor as described above.

[0013] To achieve the above object, the present utility model further provides a compressor, including the motor as described above.

[0014] Compared with the prior art, the motor rotor, motor and compressor of the present utility model have the following advantages:

[0015] The aforementioned motor rotor includes a rotor core, and a flow hole extending axially through the rotor core is provided on the rotor core. The number of the flow holes is multiple, and the multiple flow holes are arranged at intervals along the circumferential direction of the rotor core; the flow hole includes a first hole segment and a second hole segment alternately arranged along its axis; in the same flow hole, at least one of the second hole segments is located between two of the first hole segments, the cross-sectional area of the second hole segment is larger than that of the first hole segment, and the axial dimension of the second hole segment is larger than that of the first hole segment. The arrangement of the flow holes enables the flow holes to have a good sound absorption effect on low-frequency noise. The motor rotor is applied to a motor, and the motor is applied to a compressor, thereby reducing the noise generated during the operation of the compressor. Description of the Drawings

[0016] The drawings are used to better understand the present utility model and do not constitute an improper limitation to the present utility model. Among them:

[0017] Figure 1 is a schematic structural view of a motor rotor according to an embodiment of the present utility model. In the illustration, the number of the first hole segments is two and the number of the second hole segments is one;

[0018] Figure 2 is a schematic structural view of a motor rotor according to an embodiment of the present utility model. In the illustration, the number of the first hole segments is three and the number of the second hole segments is two;

[0019] Figure 3 is a schematic structural view of a motor rotor according to an embodiment of the present utility model. In the illustration, the number of the first hole segments and the number of the second hole segments are both three;

[0020] Figure 4 It is a comparison diagram of the noise transmission loss curve of the motor rotor provided by the first embodiment of the present utility model during operation and the noise transmission loss curve of the motor rotor provided by the first comparative example during operation;

[0021] Figure 5 It is a schematic structural diagram of the motor rotor provided by the second comparative example;

[0022] Figure 6 It is a comparison diagram of the noise transmission loss curve of the motor rotor provided by the first embodiment of the present utility model during operation and the noise transmission loss curve of the motor rotor provided by the second comparative example during operation;

[0023] Figure 7 It is a comparison diagram of the noise transmission loss curve of the motor rotor provided by the second embodiment of the present utility model during operation and the noise transmission loss curve of the motor rotor provided by the third comparative example during operation.

[0024] [Description of the reference numerals is as follows]:

[0025] 100 - rotor core, 110 - flow hole, 111, 111' - first hole section, 112, 112' - second hole section, 110 - inner hole, 101 - punching sheet. Specific embodiments

[0026] The following uses specific specific examples to illustrate the implementation manners of the present utility model. Those skilled in the art can easily understand other advantages and effects of the present utility model from the content disclosed in this specification. The present utility model can also be implemented or applied through other different specific implementation manners. Various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of the present utility model. It should be noted that the diagrams provided in this embodiment only illustrate the basic concept of the present utility model in a schematic manner. Therefore, only the components related to the present utility model are shown in the diagrams, rather than being drawn according to the number, shape, and size of the components during actual implementation. The types, quantities, and proportions of the components during actual implementation can be arbitrarily changed, and the component layout type may also be more complex.

[0027] In addition, each of the embodiments described below has one or more technical features. However, this does not mean that those using the present utility model must implement all the technical features in any one embodiment simultaneously, or can only separately implement some or all of the technical features in different embodiments. In other words, on the premise that implementation is possible, those skilled in the art can, according to the disclosure of the present utility model and in view of design specifications or implementation requirements, selectively implement some or all of the technical features in any one embodiment, or selectively implement combinations of some or all of the technical features in multiple embodiments, thereby increasing the flexibility when implementing the present utility model.

[0028] As used in this specification, the singular forms "a", "an" and "the" include plural referents, and the plural form "plural" includes more than two referents, unless the context clearly indicates otherwise. As used in this specification, the term "or" is generally used in the sense of including "and / or", unless the context clearly indicates otherwise, and the terms "mounted", "connected" and "coupled" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection. It may be a mechanical connection or an electrical connection. It may be directly connected or indirectly connected through an intermediate medium, and may be the internal communication of two elements or the interaction relationship between two elements. The relational terms such as "first", "second", etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations, nor indicate or imply relative importance or implicitly specify the quantity of the indicated technical features. It should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "axial", "radial", "circumferential", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation of the present utility model. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0029] To make the objectives, advantages and features of the present utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings. It should be noted that the drawings are in a very simplified form and use non-precise scales, and are only used to facilitate and clearly assist in explaining the objectives of the embodiments of the present utility model. The same or similar reference numerals in the drawings represent the same or similar components.

[0030] Figure 1and Figure 2 are schematic structural diagrams of motor rotors provided by different embodiments of the present utility model. As Figure 1 and Figure 2 shown, the motor rotor includes a rotor core 100, and a flow hole 110 extending axially through the rotor core 100 is provided on the rotor core 100. The flow hole 110 is used for the refrigerant for cooling the motor rotor to flow through. The flow hole 110 includes a first hole section 111 and a second hole section 112 arranged alternately along its axis. In the same flow hole, at least one of the second hole sections 112 is located between two of the first hole sections 111. The cross-sectional area of the first hole section 111 is smaller than that of the second hole section 112, and the axial dimension L1 of the first hole section 111 is smaller than the axial dimension L2 of the second hole section 112.

[0031] The arrangement of the flow hole 110 can, on the one hand, eliminate the low-frequency noise brought by the refrigerant when flowing through the flow hole 110 through the second hole section 112 located between two of the first hole sections 111 to reduce the noise during the operation of the motor rotor, and on the other hand, can also increase the flow rate of the refrigerant and improve the cooling effect of the motor rotor. Here, the low frequency refers to the noise with a frequency below 800 Hz, especially the noise with a frequency in the range of 400 Hz to 600 Hz.

[0032] It should be noted that the alternate arrangement of the first hole section 111 and the second hole section 112 along the axis of the flow hole 110 means that the second hole section 112 adjacent to the first hole section 111 and the first hole section 111 adjacent to the second hole section 112. In other words, each of the first hole sections 111 is arranged adjacent to the second hole section 112. Since at least one of the second hole sections 112 is located between two of the first hole sections 111, therefore, the specific form of the flow hole 110 includes the first hole section 111, the second hole section 112, and the first hole section 111 connected in sequence; or includes the first hole section 111, the second hole section 112, the first hole section 111, and the second hole section 112 connected in sequence; or includes the first hole section 111, the second hole section 112, the first hole section 111, the second hole section 112, and the first hole section 111... That is, the number of the first hole sections 111 is equal to the number of the second hole sections 112 and is not less than 2, or the number of the first hole sections 111 is 1 more than the number of the second hole sections 112.

[0033] It can be understood that only the second hole section 112 located between the two first hole sections 111 has a silencing effect, while the second hole section 112 adjacent to only one first hole section 111 (i.e., the second hole section 112 near the end of the motor rotor, such as Figure 3 the second hole section 112 at the uppermost end in Figure 3 ) does not have a silencing effect due to no interception effect. Therefore, in a preferred embodiment, the number of the first hole sections 111 in each flow hole 110 is 1 more than the number of the second hole sections 112, so that each second hole section 112 in the flow hole 110 is located between two first hole sections 111 to achieve a better silencing effect.

[0034] Optionally, in the same flow hole 110, the ratio of the axial dimension L1 of the first hole section 111 to the axial dimension L0 of the flow hole 110 is greater than or equal to 1 / 20 and less than 1 / 3. More specifically, when the total number of the first hole sections 111 and the second hole sections 112 included in the flow hole 110 is n, the ratio of the axial dimension L1 of the first hole section 111 to the axial dimension L0 of the flow hole 110 is less than 1 / n, and it should be understood that n is greater than or equal to 3.

[0035] Those skilled in the art know that the rotor core 100 includes a plurality of punching sheets 101 stacked along its axial direction, and the axial dimension of the punching sheet 101 is relatively thin, about 0.5 mm. In the embodiment of the present invention, the first hole section 111 penetrates at least five punching sheets 101, so that the axial length of the first hole section 111 is at least 0.25 mm. In this way, the first hole section 111 can have sufficient stiffness and also reduce the vibration of the motor rotor during operation. Generally, the first hole section 111 penetrates at most twelve punching sheets 101 so that the axial length of the first hole section 111 is at most 6 mm.

[0036] Optionally, in the same flow hole 110, the ratio of the cross-sectional area of the first hole section 111 to the cross-sectional area of the second hole section 112 is less than or equal to 1 / 5, and specifically can be 1 / 9, 1 / 8, 1 / 7, 1 / 6, 1 / 5, etc.

[0037] For the flow hole 110 including more than two of the second hole segments 112 and more than three of the first hole segments 111, the ratio of the axial dimension of the first hole segment 111 located between two of the second hole segments 112 to the axial dimension of the first hole segment 111 adjacent to one of the second hole segments 112 is greater than or equal to 5 / 6 and less than or equal to 1; the ratio of the cross-sectional area of the first hole segment 111 located between two of the second hole segments 112 to the cross-sectional area of the first hole segment 111 adjacent to one of the second hole segments 112 is greater than or equal to 1 and less than or equal to 3; and, the ratio of the axial dimensions of any two designated second hole segments 112 is greater than or equal to 1 and less than or equal to 3, and each designated second hole segment 112 is located between two of the first hole segments 111.

[0038] Taking Figure 2 the shown motor rotor as an example, in the Figure 2 orientation shown, along the direction from top to bottom, the three first hole segments 111 of one flow hole 110 are respectively called the first first hole segment 111, the second first hole segment 111, and the third first hole segment 111. The second first hole segment 111 is located between two of the second hole segments 112, the first first hole segment 111 is adjacent to one of the second hole segments 112, and the third first hole segment 111 is adjacent to one of the second hole segments 112. Each of the second hole segments 112 is located between two of the first hole segments 111.

[0039] Therefore, in Figure 2 the axial dimension ratio of the second first hole segment 111 to the first first hole segment 111 is greater than or equal to 5 / 6 and less than or equal to 1, and the axial dimension ratio of the second first hole segment 111 to the third first hole segment 111 is greater than or equal to 5 / 6 and less than or equal to 1. The ratio of the cross-sectional area of the second first hole segment 111 to the cross-sectional area of the first first hole segment 111 is 1:3, and the ratio of the cross-sectional area of the second first hole segment 111 to the cross-sectional area of the first third hole segment 111 is 1:3. The axial dimensions of the two second hole segments 112 are greater than or equal to 1 and less than or equal to 3.

[0040] Taking Figure 3 the shown motor rotor as an example, in the Figure 3In the orientation shown, along the direction from top to bottom, the three first hole segments 111 are respectively referred to as the fourth first hole segment 111, the fifth first hole segment 111, and the sixth first hole segment 111, and the three second hole segments 112 are respectively referred to as the first second hole segment 112, the second second hole segment 112, and the third second hole segment 112. Among them, the fourth first hole segment 111 is located between the two second hole segments 112, namely the first second hole segment 112 and the second second hole segment 112; the fifth first hole segment 111 is located between the two second hole segments 112, namely the second second hole segment 112 and the third second hole segment 112; the sixth first hole segment 111 is adjacent to only one second hole segment 112, namely the third second hole segment 112; and the first second hole segment 112 is adjacent to only one first hole segment 111, namely the fourth first hole segment 111.

[0041] Therefore, in Figure 3 the ratio of the axial dimension of the fourth first hole segment 111 to the axial dimension of the sixth first hole segment 111 is greater than or equal to 5 / 6 and less than or equal to 1, and the ratio of the axial dimension of the fifth first hole segment 111 to the axial dimension of the sixth first hole segment 111 is greater than or equal to 5 / 6 and less than or equal to 1. The ratio of the cross-sectional area of the fourth first hole segment 111 to the cross-sectional area of the sixth first hole segment 111 is greater than or equal to 1 and less than or equal to 3, and the ratio of the cross-sectional area of the fifth first hole segment 111 to the cross-sectional area of the sixth first hole segment 111 is greater than or equal to 1 and less than or equal to 3. The ratio of the axial dimension of the second second hole segment 112 to the axial dimension of the third second hole segment 112 is greater than or equal to 1 and less than or equal to 3. It can be understood that the ratio of the axial dimension of the third second hole segment 112 to the axial dimension of the second second hole segment 112 being greater than or equal to 1 and less than or equal to 3 is also acceptable.

[0042] The embodiments of the present invention do not have special limitations on the shapes of the cross-sections of the first hole segment 111 and the second hole segment 112. The cross-section of the first hole segment 111 can be circular, elliptical, kidney-shaped, regular polygon-shaped, or any other suitable shape, and the cross-section of the second hole segment 112 can be circular, elliptical, kidney-shaped, regular polygon-shaped, or any other suitable shape. In a preferred embodiment, the cross-section of the second hole segment 112 is kidney-shaped to maximize the cross-sectional area of the second hole segment 112 as much as possible. In addition, all the first hole segments 111 and all the second hole segments 112 of the same flow hole 110 can be coaxially arranged or non-coaxially arranged, and the embodiments of the present invention do not limit this.

[0043] In addition, those skilled in the art can also understand that the rotor core 100 is further provided with an inner hole 120 for connecting to the rotating shaft. The flow holes 110 are arranged on the outer periphery of the inner hole 120. In a preferred embodiment, the number of the flow holes 110 is multiple, and the multiple flow holes 110 are arranged at intervals around the inner hole 120, for example, arranged at equal intervals. The number of the flow holes 110 can be greater than or equal to 2 and less than or equal to 6. It should be noted that the Figures 1 to 3 does not show the edge lines of the punching sheet 101 at the flow holes 110 and the inner hole 120, and the purpose is to clearly show the flow holes 110 and the inner hole 120.

[0044] Next, the effects of the technical solutions of the present invention will be described with two specific embodiments and corresponding comparative examples.

[0045] The structure of the motor rotor of the first embodiment is as Figure 1 shown, which includes four flow holes 110 arranged at equal circumferential intervals along the inner hole 120, and each flow hole 110 includes two first hole segments 111 and one second hole segment 112 that are coaxially and alternately arranged. The cross-section of the first hole segment 111 is circular, and the cross-section of the second hole segment 112 is waist-shaped. In the same flow hole 110, the two first hole segments 111 have equal axial dimensions and equal cross-sections. The ratio of the axial dimension L1 of the first hole segment 111 to the axial dimension L0 of the rotor core 100 is 1 / 10, and the first hole segment 111 penetrates six punching sheets 101, so that L1 is approximately 3 mm and L0 is approximately 30 mm. The ratio of the area of the cross-section of the first hole segment 111 to the area of the cross-section of the second hole segment 112 is 1 / 9.

[0046] When the motor rotor provided in the first embodiment is in operation, the loss amounts of the noises at various frequencies generated when the refrigerant flows through the flow holes 110 are simulated, and the obtained results are as Figure 4 and Figure 6 shown by curve 1 in.

[0047] The difference between the motor rotor provided in the first comparative example and the motor rotor of the first comparative example is that the cross-section of the flow hole is a waist shape with a constant size throughout the entire axial length thereof, and the area of the cross-section of the flow hole is the same as the area of the cross-section of the second hole segment 112 in the first embodiment.

[0048] When the motor rotor provided in the first comparative example is in operation, the loss amounts of the noises at various frequencies generated when the refrigerant flows through the flow hole are simulated, and the obtained results are as Figure 4 shown by curve 2 in.

[0049] The difference between the motor rotor provided by the second comparative example and the motor rotor of the first comparative example is that the axial length of the first hole section 111' is greater than the axial length of the second hole section 112' (as Figure 5 shown), specifically, the ratio of the axial length of the first hole section 111' to the axial length of the second hole section 112' is 3:1.

[0050] When the motor rotor provided by the second comparative example is in operation, the loss amount of the noise at each frequency generated when the refrigerant flows through the flow hole is simulated, and the obtained result is as shown in the curve 2 in Figure 6 .

[0051] The structure of the motor rotor provided by the second embodiment is as shown in Figure 2 , including four flow holes 110 arranged at equal intervals in the circumferential direction of the inner hole 120, and each flow hole 110 includes three first hole sections 111 and two second hole sections 112 arranged coaxially and alternately. The cross-section of the first hole section 111 is circular, and the cross-section of the second hole section 112 is waist-shaped. In the same flow hole 110, the three first hole sections 111 have equal axial dimensions and equal cross-sections. The ratio of the axial dimension L1 of the first hole section 111 to the axial dimension L0 of the rotor core 100 is 1 / 10, and the first hole section 111 penetrates through six punching sheets 101, so that L1 is approximately 3 mm and L0 is approximately 30 mm. The two second hole sections 112 have equal cross-sections, and the ratio of the area of the cross-section of each second hole section 112 to the area of the cross-section of the first hole section 111 is 9. The ratio of the axial dimensions of the two second hole sections 112 is 1:2, that is, the axial dimension of one second hole section 112 is approximately 7 mm, and the axial dimension of the other second hole section 112 is approximately 14 mm.

[0052] When the motor rotor provided by the second embodiment is in operation, the loss amount of the noise at each frequency generated when the refrigerant flows through the flow hole 110 is simulated, and the obtained result is as shown in the curve 1 in Figure 7 .

[0053] The difference between the motor rotor provided by the third comparative example and the motor rotor of the second embodiment is that the cross-section of the flow hole is a waist shape with a constant size throughout its entire axial length, and the area of the cross-section of the flow hole is the same as the area of the cross-section of the second hole section 112 in the second embodiment.

[0054] When the motor rotor provided by the third comparative example is in operation, the loss amount of the noise at each frequency generated when the refrigerant flows through the flow hole is simulated, and the obtained result is as shown in the curve 2 in Figure 7 .

[0055] FromFigure 4 As can be seen, for the noise generated by the refrigerant with a frequency in the range of 20 Hz to 1100 Hz, the noise reduction effect of the flow holes 110 of the motor rotor provided in the first embodiment is better than that of the flow holes of the motor rotor in the first comparative example. In particular, for the noise with a frequency in the range of 200 Hz to 800 Hz, the noise reduction volume of the motor rotor provided in the first embodiment is about 8 dB higher than that provided in the first comparative example, and the effect is good. From Figure 6 As can be seen, the noise reduction effect of the flow holes 110 of the motor rotor provided in the first embodiment on low-frequency noise is much better than that of the flow holes of the motor rotor in the second comparative example on low-frequency noise.

[0056] From Figure 7 As can be seen, for the noise generated by the refrigerant with a frequency in the range of 20 Hz to 1200 Hz and the noise with a frequency higher than 1600 Hz, the noise reduction effect of the flow holes 110 of the motor rotor provided in the second embodiment is better than that of the flow holes of the motor rotor in the third comparative example. Among them, for the noise with a frequency in the range of 200 Hz to 800 Hz, the noise reduction volume of the motor rotor provided in the third embodiment is about 8 dB higher than that provided in the second comparative example.

[0057] Those skilled in the art know that the axial dimension of the motor rotor of the motor used in the compressor is generally between 30 mm and 50 mm, and the frequency of its cavity mode is approximately between 200 Hz and 400 Hz. Therefore, the application of the motor rotor provided in the embodiment of the present invention can effectively reduce the noise generated when the refrigerant flows through the flow holes 110, thereby improving the running noise problem of such motors.

[0058] Furthermore, the embodiment of the present invention also provides a motor, which includes the aforementioned motor rotor. It should be understood that the motor further includes a motor stator. In some examples, the motor stator is sleeved on the outer peripheral surface of the motor rotor. In other examples, the motor rotor is sleeved on the outer peripheral surface of the motor stator.

[0059] Even further, the embodiment of the present invention also provides a compressor, and the compressor includes the aforementioned motor.

[0060] Although the present invention is disclosed as above, it is not limited thereto. Those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalent technologies, the present invention also intends to include these modifications and variations.

Claims

1. A motor rotor, characterized in that: It comprises a rotor core, on which a flow hole extending axially therethrough is provided, the number of the flow holes being multiple, and the multiple flow holes being arranged at intervals along the circumferential direction of the rotor core; the flow holes comprise first hole segments and second hole segments alternately arranged axially therethrough; in the same flow hole, at least one of the second hole segments is located between two of the first hole segments, the cross section of the second hole segment is larger than the cross section of the first hole segment, and the axial dimension of the second hole segment is larger than the axial dimension of the first hole segment.

2. The motor rotor according to claim 1, characterized in that: The number of the first hole segments of the same flow hole is greater than the number of the second hole segments.

3. The motor rotor according to claim 1, characterized in that: The ratio of the axial dimension of the first hole section of the same circulation hole to the axial dimension of the circulation hole is greater than or equal to 1 / 20 and less than or equal to 1 / 3.

4. The motor rotor according to claim 1, characterized in that: The ratio of the cross-sectional area of ​​the first hole segment to the cross-sectional area of ​​the second hole segment of the same flow hole is less than or equal to 1 / 5.

5. The motor rotor according to any one of claims 1 to 4, characterized in that: The flow hole includes more than three first hole segments and more than two second hole segments, and the ratio of the axial size of the first hole segment located between two second hole segments to the axial size of the first hole segment adjacent to one second hole segment is greater than or equal to 5 / 6 and less than or equal to 1.

6. The motor rotor according to any one of claims 1 to 4, characterized in that: The flow hole includes more than three first hole segments and more than two second hole segments, and the ratio of the cross-sectional area of ​​the first hole segment located between two second hole segments to the cross-sectional area of ​​the first hole segment adjacent to one second hole segment is greater than or equal to 1 and less than or equal to 3.

7. The motor rotor according to any one of claims 1 to 4, characterized in that: The flow hole includes more than three first hole segments and more than two second hole segments, the ratio of the axial dimensions of any two specified second hole segments is greater than or equal to 1 and less than or equal to 3; the specified second hole segment is located between two first hole segments.

8. The motor rotor according to claim 1, characterized in that: The motor rotor comprises a plurality of punching sheets stacked along its axial direction; the first hole section penetrates at least five of the punching sheets.

9. A motor, characterized in that: The invention comprises a motor rotor as claimed in any one of claims 1 to 8.

10. A compressor, characterized in that: Comprising the motor as claimed in claim 9.

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