Motor rotor and motor with same

Abstract

The utility model provides a motor rotor and a motor with the same. The motor rotor comprises a rotor body, the outer surface of the rotor body is provided with a buffering concave part and at least two flow guide concave parts, the liquid inlet end of each flow guide concave part is communicated with the buffering concave part, and the at least two flow guide concave parts are arranged at intervals in the extending direction of the rotor body; the rotor shaft is arranged on the rotor body; and each flow guide concave part is spirally arranged along the extension direction of the rotor body. According to the utility model, the problem that the irreversible high-temperature demagnetization phenomenon is easily generated on the motor due to the poor cooling effect of the motor rotor in the prior art is effectively solved.

Description

Technical Field

[0001] The utility model relates to the technical field of motors, and in particular to a motor rotor and a motor having the same. Background Art

[0002] At present, during the high-speed rotation of the motor rotor, the cooling problem of the motor rotor has always been the key and difficult problem in the design and development of high-speed motors. Since the magnet is buried inside the motor rotor, the external air cooling cannot directly cool the magnet. Therefore, the temperature rise problem of the magnet has not been effectively solved. Once the cooling is insufficient, irreversible demagnetization is very likely to occur, seriously affecting the performance of the motor.

[0003] In the prior art, in order to solve the above problems, radial ventilation cooling is usually achieved by using the air gap between the stator and rotor, rotating the impeller to supply air, or opening holes in the stator and the housing. The air duct flows through the air gap between the stator and rotor, thereby taking away some of the heat.

[0004] However, although the above cooling method can cool the motor rotor to a certain extent, the compressed air entering the casing is relatively dispersed, and the actual effective cooling area of ​​the motor rotor is relatively small, resulting in poor cooling effect on the motor rotor, high temperature rise of the rotor part and difficulty in dissipating heat, and irreversible high-temperature demagnetization is prone to occur on the motor. Utility Model Content

[0005] The main purpose of the utility model is to provide a motor rotor and a motor having the same, so as to solve the problem in the prior art that the cooling effect of the motor rotor is poor, resulting in irreversible high-temperature demagnetization phenomenon easily occurring on the motor.

[0006] In order to achieve the above-mentioned purpose, according to one aspect of the utility model, a motor rotor is provided, comprising: a rotor body, a cache recess and at least two flow guide recesses are arranged on the outer surface of the rotor body, the liquid inlet end of each flow guide recess is connected to the cache recess, and at least two flow guide recesses are arranged at intervals along the extension direction of the rotor body; a rotor shaft is arranged on the rotor body; wherein each flow guide recess is spirally arranged along the extension direction of the rotor body.

[0007] Furthermore, the cache recess extends along the circumferential direction of the rotor body, and along the extending direction of the cache recess, the width of at least part of the cache recess gradually decreases.

[0008] Furthermore, the cache recess is a groove, and the groove wall of the groove includes: a first wall surface and a second wall surface arranged opposite to each other; a third wall surface, located between the first wall surface and the second wall surface and connected to both the first wall surface and the second wall surface; wherein, along the extension direction of the groove, the distance between the first wall surface and the second wall surface gradually decreases, and the first wall surface and the second wall surface are arranged at an angle A, and the angle A is less than or equal to 30°.

[0009] Furthermore, at least two flow guide recesses include a first flow guide recess and a second flow guide recess, the buffer recess is located in the middle of the rotor body, the liquid outlet end of the first flow guide recess extends to the first end of the rotor body, and the liquid outlet end of the second flow guide recess extends to the second end of the rotor body.

[0010] Furthermore, each guide recess is a spiral groove, and the groove width d and pitch L1 of the spiral groove satisfy the following conditions with the length L of the motor rotor: when L≤100mm, 5mm<L1≤20mm, d≤10mm; when 100mm<L≤200mm, 10mm<L1≤40mm, d≤20mm; when L>200mm, L1>15mm, d>5mm.

[0011] Furthermore, each guide recess is a spiral groove, and the groove depth h of the spiral groove and the outer diameter D of the rotor body satisfy: when D≤100mm, h≤2.5mm; when 100mm<D≤200mm, h≤5mm; when D>200mm, h≤10mm.

[0012] Furthermore, a third angle is formed between the liquid inlet direction of each guide recess and the extension direction of the buffer recess; and / or the first guide recess and the second guide recess are symmetrically arranged with respect to the buffer recess.

[0013] Furthermore, the spiral groove is a polygonal groove, a V-shaped groove, a U-shaped groove, or an arc-shaped groove.

[0014] Furthermore, a central angle corresponding to the cache recess is less than or equal to 90°.

[0015] According to another aspect of the present invention, a motor is provided, comprising the motor rotor as claimed in the claims above.

[0016] According to the technical solution of the utility model, the motor rotor includes a rotor body and a rotor shaft. A buffer recess and at least two flow guide recesses are arranged on the outer surface of the rotor body. The liquid inlet end of each flow guide recess is connected to the buffer recess. At least two flow guide recesses are arranged at intervals along the extension direction of the rotor body. The rotor shaft is arranged on the rotor body. Among them, each flow guide recess is arranged spirally along the extension direction of the rotor body. In this way, the above-mentioned arrangement of at least two flow guide recesses can form a plurality of cooling flow paths with different flow directions on the rotor body. The cooling medium can flow in the above-mentioned cooling flow path, thereby fully cooling the rotor body. At the same time, the high-speed rotation of the motor rotor can be used to enhance its cooling effect and reduce the risk of high-temperature demagnetization, thereby solving the problem in the prior art that the cooling effect of the motor rotor is poor and the irreversible high-temperature demagnetization phenomenon is easy to occur on the motor, and improving the operation stability and reliability of the motor. At the same time, the buffer recess is used to store and cache the cooling medium to supply the cooling medium to each flow guide recess, further improving the cooling effect of the cooling medium on the motor rotor. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The drawings constituting part of the present application are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention. In the drawings:

[0018] Figure 1 A schematic diagram of the three-dimensional structure of an embodiment of a motor rotor according to the utility model is shown;

[0019] Figure 2 Shows Figure 1 Front view of the motor rotor in .

[0020] The above drawings include the following reference numerals:

[0021] 10. rotor body; 11. cache recess; 111. first wall surface; 112. second wall surface; 113. third wall surface; 12. flow guide recess; 121. first flow guide recess; 122. second flow guide recess;

[0022] 20. Rotor shaft. DETAILED DESCRIPTION

[0023] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present utility model will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0024] It should be noted that, unless otherwise specified, all technical and scientific terms used in this application have the same meanings as commonly understood by ordinary technicians in the technical field to which this application belongs.

[0025] In the present invention, unless otherwise specified, directional words such as "up" and "down" are usually used in reference to the directions shown in the drawings, or in reference to the vertical, perpendicular or gravity direction; similarly, for ease of understanding and description, "left" and "right" are usually used in reference to the left and right shown in the drawings; "inside" and "outside" refer to the inside and outside relative to the outline of each component itself, but the above directional words are not used to limit the present invention.

[0026] In order to solve the problem in the prior art that the cooling effect of the motor rotor is poor, which leads to irreversible high-temperature demagnetization phenomenon on the motor, the present application provides a motor rotor and a motor having the same.

[0027] like Figure 1 and Figure 2 As shown, the motor rotor includes a rotor body 10 and a rotor shaft 20. A buffer recess 11 and at least two flow guide recesses 12 are provided on the outer surface of the rotor body 10, and the liquid inlet end of each flow guide recess 12 is connected to the buffer recess 11, and at least two flow guide recesses 12 are arranged at intervals along the extension direction of the rotor body 10. The rotor shaft 20 is arranged on the rotor body 10. Among them, each flow guide recess 12 is spirally arranged along the extension direction of the rotor body 10.

[0028] By applying the technical solution of this embodiment, the above-mentioned arrangement of at least two flow guide recesses 12 can form a plurality of cooling flow paths with different flow directions on the rotor body 10, and the cooling medium can flow in the above-mentioned cooling flow paths, thereby fully cooling the rotor body 10, and at the same time, the high-speed rotation of the motor rotor can be used to enhance its cooling effect, reduce the risk of high-temperature demagnetization, and thus solve the problem of poor cooling effect on the motor rotor in the prior art, which leads to irreversible high-temperature demagnetization on the motor, and improve the running stability and reliability of the motor. At the same time, the buffer recess 11 is used to store and buffer the cooling medium to supply the cooling medium to each flow guide recess 12, further improving the cooling effect of the cooling medium on the motor rotor.

[0029] In this embodiment, there are two flow guide recesses 12, the liquid inlet end of each flow guide recess 12 is connected to the buffer recess 11, and the two flow guide recesses 12 are arranged at intervals along the extension direction of the rotor body 10. In this way, the above arrangement realizes a two-way flow guide cooling flow path, through which the cooling medium is passed to achieve sufficient cooling of the motor rotor, and at the same time, the high-speed rotation of the motor rotor is used to enhance its cooling effect and reduce the risk of high-temperature demagnetization.

[0030] It should be noted that the number of the flow guiding recesses 12 is not limited thereto and can be adjusted according to working conditions and usage requirements. Optionally, the number of the flow guiding recesses 12 is three, four, five, or more.

[0031] In this embodiment, the cooling medium is a coolant. It should be noted that the selection of the cooling medium is not limited thereto and can be adjusted according to working conditions and usage requirements. Optionally, the cooling medium is a non-conductive medium such as compressed air or cooling oil.

[0032] Optionally, the cache recess 11 extends along the circumference of the rotor body 10, and along the extension direction of the cache recess 11, the width of at least part of the cache recess 11 gradually decreases. In this way, under the premise of increasing the cache capacity of the cache recess 11 for the cooling medium, the above arrangement ensures that the cooling medium cached in the cache recess 11 can smoothly enter the liquid inlet end of each guide recess 12, thereby improving the flow smoothness of the cooling medium on the motor rotor. At the same time, reducing the width of the cache recess 11 can increase the flow rate of the cooling medium, thereby ensuring that the cooling medium can enter all the guide recesses 12 to cool the rotor body 10.

[0033] In this embodiment, the width of the cache recess 11 gradually decreases along the extension direction of the cache recess 11, so that the structure of the cache recess 11 is simpler, easier to process and realize, and the processing cost and difficulty of the cache recess 11 are reduced.

[0034] like Figure 2 As shown, the cache recess 11 is a groove, and the groove wall of the groove includes a first wall 111, a second wall 112 and a third wall 113 that are arranged opposite to each other. The third wall 113 is located between the first wall 111 and the second wall 112 and is connected to both the first wall 111 and the second wall 112. Among them, along the extension direction of the groove, the distance between the first wall 111 and the second wall 112 gradually decreases, and the first wall 111 and the second wall 112 are arranged at an angle A, and the angle A is less than or equal to 30°. In this way, the above-mentioned setting makes the structure of the cache recess 11 simpler, easy to process and realize, and reduces the processing cost and processing difficulty of the rotor body 10; on the other hand, the above-mentioned setting of the angle A avoids the accumulation of cooling medium between the first wall 111 and the second wall 112 to affect the normal flow of the cooling medium, and further improves the flow smoothness of the cooling medium in the cache recess 11, so as to achieve rapid cooling of the motor rotor.

[0035] In this embodiment, the angle A is 30°.

[0036] It should be noted that the value of the angle A is not limited thereto and can be adjusted according to working conditions and usage requirements. Optionally, the angle A is 10°, or 15°, or 20°, or 25°, or 28°.

[0037] like Figure 1 and Figure 2As shown, at least two flow guide recesses 12 include a first flow guide recess 121 and a second flow guide recess 122, the buffer recess 11 is located in the middle of the rotor body 10, the liquid outlet end of the first flow guide recess 121 extends to the first end of the rotor body 10, and the liquid outlet end of the second flow guide recess 122 extends to the second end of the rotor body 10. In this way, the above arrangement, on the one hand, makes the distribution of the buffer recess 11, the first flow guide recess 121 and the second flow guide recess 122 on the rotor body 10 more reasonable, so as to ensure that the entire rotor body 10 can be covered by the cooling medium to achieve sufficient cooling; on the other hand, the above arrangement improves the structural strength of the rotor body 10 and prolongs the service life of the motor rotor.

[0038] In this embodiment, the liquid inlet end of the first guide recess 121 is connected to the cache recess 11, and the liquid outlet end extends to the first end of the rotor body 10, and the liquid inlet end of the second guide recess 122 is connected to the cache recess 11, and the liquid outlet end extends to the second end of the rotor body 10, so that the cache recess 11, the first guide recess 121 and the second guide recess 122 fully cover the outer surface of the rotor body 10, thereby fully and quickly cooling the rotor body 10.

[0039] Optionally, each guide concave portion 12 is a spiral groove, and the groove width d and pitch L1 of the spiral groove meet the following conditions with the length L of the motor rotor: when L≤100mm, 5mm<L1≤20mm, d≤10mm; when 100mm<L≤200mm, 10mm<L1≤40mm, d≤20mm; when L>200mm, L1>15mm, d>5mm. In this way, the larger the length L, the longer the motor rotor. On the basis of reducing the eddy current and wind wear loss of the entire shaft, the above-mentioned dimensional relationship between the length L, the groove width d and the pitch L1 can achieve the best cooling of the motor rotor.

[0040] Optionally, each guide concave portion 12 is a spiral groove, and the groove depth h of the spiral groove and the outer diameter D of the rotor body 10 satisfy: when D≤100mm, h≤2.5mm; when 100mm<D≤200mm, h≤5mm; when D>200mm, h≤10mm. In this way, the larger the outer diameter D, the thicker the motor rotor, the larger the required cooling flow, the larger the groove width d and the groove depth h, and the above-mentioned dimensional relationship between the outer diameter D and the groove depth h can achieve the best cooling of the motor rotor on the basis of reducing the eddy current and wind grinding loss of the entire shaft.

[0041] Optionally, the liquid inlet direction of each guide recess 12 and the extension direction of the buffer recess 11 are arranged at a third angle; and / or the first guide recess 121 and the second guide recess 122 are arranged symmetrically about the buffer recess 11. In this way, the above arrangement of the third angle ensures that the first guide recess 121 and the second guide recess 122 can fully cover the rotor body 10, so as to improve the cooling effect of the cooling medium on the rotor body 10. At the same time, the above arrangement improves the overall structural strength of the motor rotor, thereby extending the service life of the motor rotor.

[0042] Optionally, the spiral groove is a polygonal groove, a V-shaped groove, a U-shaped groove, or an arc groove. In this way, the above arrangement makes the shape of the guide recess 12 more flexible to meet different usage requirements and working conditions, and also improves the processing flexibility of the staff.

[0043] In this embodiment, the spiral groove is a rectangular groove.

[0044] Optionally, the central angle of the buffer recess 11 is less than or equal to 90°. In this way, under the premise of ensuring that the buffer recess 11 can buffer the cooling medium, the above arrangement further increases the occupied area of ​​the guide recess 12, improves the cooling efficiency of the cooling medium on the motor rotor, and achieves rapid temperature reduction and cooling.

[0045] The present application also provides a motor (not shown) comprising the motor rotor described above.

[0046] From the above description, it can be seen that the above embodiments of the utility model achieve the following technical effects:

[0047] The motor rotor includes a rotor body and a rotor shaft. A buffer recess and at least two flow guide recesses are arranged on the outer surface of the rotor body. The liquid inlet end of each flow guide recess is connected to the buffer recess. At least two flow guide recesses are arranged at intervals along the extension direction of the rotor body. The rotor shaft is arranged on the rotor body. Among them, each flow guide recess is arranged spirally along the extension direction of the rotor body. In this way, the above-mentioned arrangement of at least two flow guide recesses can form a plurality of cooling flow paths with different flow directions on the rotor body. The cooling medium can flow in the above-mentioned cooling flow path, thereby fully cooling the rotor body. At the same time, the high-speed rotation of the motor rotor can be used to enhance its cooling effect and reduce the risk of high-temperature demagnetization, thereby solving the problem in the prior art that the cooling effect of the motor rotor is poor and the irreversible high-temperature demagnetization phenomenon is easy to occur on the motor, and improving the operation stability and reliability of the motor. At the same time, the buffer recess is used to store and cache the cooling medium to supply the cooling medium to each flow guide recess, further improving the cooling effect of the cooling medium on the motor rotor.

[0048] Obviously, the embodiments described above are only some embodiments of the utility model, not all embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the utility model.

[0049] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0050] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the numbers used in this way can be interchanged where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein.

[0051] The above description is only the preferred embodiment of the utility model, and is not intended to limit the utility model. For those skilled in the art, the utility model can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A motor rotor, characterized in that: include: A rotor body (10), wherein a buffer recess (11) and at least two flow guide recesses (12) are arranged on the outer surface of the rotor body (10), the liquid inlet end of each of the flow guide recesses (12) is connected to the buffer recess (11), and the at least two flow guide recesses (12) are arranged at intervals along the extension direction of the rotor body (10); A rotor shaft (20) is arranged on the rotor body (10); Wherein, each of the flow guide recesses (12) is spirally arranged along the extension direction of the rotor body (10).

2. The motor rotor according to claim 1, characterized in that: The cache recess (11) extends along the circumferential direction of the rotor body (10), and along the extending direction of the cache recess (11), the width of at least part of the cache recess (11) gradually decreases.

3. The motor rotor according to claim 1, characterized in that: The buffer recess (11) is a groove, and the groove wall of the groove comprises: A first wall surface (111) and a second wall surface (112) arranged opposite to each other; a third wall surface (113), located between the first wall surface (111) and the second wall surface (112) and connected to both the first wall surface (111) and the second wall surface (112); Wherein, along the extension direction of the groove, the distance between the first wall surface (111) and the second wall surface (112) gradually decreases, and the first wall surface (111) and the second wall surface (112) are arranged at an angle A, and the angle A is less than or equal to 30°.

4. The motor rotor according to claim 1, characterized in that: The at least two flow guide recesses (12) include a first flow guide recess (121) and a second flow guide recess (122); the buffer recess (11) is located in the middle of the rotor body (10); the liquid outlet end of the first flow guide recess (121) extends to the first end of the rotor body (10); and the liquid outlet end of the second flow guide recess (122) extends to the second end of the rotor body (10).

5. The motor rotor according to claim 1, characterized in that: Each of the flow guide recesses (12) is a spiral groove, and the groove width d and the pitch L1 of the spiral groove satisfy the following relationship with the length L of the motor rotor: When L≤100mm, 5mm<L1≤20mm, d≤10mm; When 100mm<L≤200mm, 10mm<L1≤40mm, d≤20mm; When L>200mm, L1>15mm, d>5mm.

6. The motor rotor according to claim 1, characterized in that: Each of the flow guide recesses (12) is a spiral groove, and the groove depth h of the spiral groove and the outer diameter D of the rotor body (10) satisfy the following relationship: When D≤100mm, h≤2.5mm; When 100mm<D≤200mm, h≤5mm; When D>200mm, h≤10mm.

7. The motor rotor according to claim 4, characterized in that: The liquid inlet direction of each of the flow guiding recesses (12) and the extension direction of the buffer recess (11) are arranged at a third angle; and / or the first flow guiding recess (121) and the second flow guiding recess (122) are symmetrically arranged with respect to the buffer recess (11).

8. The motor rotor according to claim 5 or 6, characterized in that: The spiral groove is a polygonal groove, a V-shaped groove, a U-shaped groove, or an arc-shaped groove.

9. The motor rotor according to claim 1, characterized in that: The central angle corresponding to the buffer recess (11) is less than or equal to 90°.

10. A motor, characterized in that: The invention comprises the motor rotor according to any one of claims 1 to 9.

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