Rotor core and asynchronous motor
By setting shaft holes, exhaust passages and rotor grooves on the rotor core, the problem of poor exhaust effect of cast aluminum rotors is solved, and the quality of aluminum guide bars and the performance of motor are improved.
Patent Information
- Application Number
- CN202421075742.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-05-17
- Publication Date
- 2025-02-18
- Estimated Expiration
- 2034-05-17
AI Technical Summary
The exhaust effect of existing cast aluminum rotors is poor, resulting in problems such as pores, fine lines, cracks, etc. in the aluminum guide strips, affecting the performance of the motor.
A rotor core is designed, including a shaft hole, an exhaust passage and multiple rotor grooves. The gas in the rotor groove is discharged into the shaft hole through the exhaust passage to ensure the smooth discharge of the gas.
It effectively avoids problems such as pores, fine lines, cracks and other problems in the cast aluminum end ring and aluminum guide strip, ensures the quality of cast aluminum and improves the motor performance.
Smart Images
Figure CN222509054U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of motors, in particular to a rotor core and an asynchronous motor. Background Art
[0002] The rotor core is formed by stacking a certain number of rotor sheets. There are a certain number of slots in the rotor core, and the molten aluminum is cast into it to form aluminum bars. Exhaust of existing cast aluminum rotors is usually achieved by casting aluminum molds, but due to the high speed of aluminum liquid injection, it is impossible to completely exhaust the air in the rotor cavity, resulting in pores, fine lines, cracks and other problems in the cast aluminum end rings and aluminum bars, thereby affecting the performance of the motor. Utility Model Content
[0003] The main purpose of the utility model is to provide a rotor core and an asynchronous motor, aiming to solve the problem of poor exhaust effect of the existing cast aluminum rotor.
[0004] To achieve the above-mentioned purpose, the utility model proposes a rotor core, which is provided with an axial hole, an exhaust channel and a plurality of rotor slots; the plurality of rotor slots are arranged around the axial hole on the rotor core, the axial hole is used to accommodate a rotating shaft, and the rotor slots are used to accommodate rotor guide bars; at least some of the plurality of rotor slots are connected to the axial hole through the exhaust channel.
[0005] In one embodiment, one end of the exhaust passage is communicated with the corresponding rotor slot, and the other end of the exhaust passage is communicated with the shaft hole.
[0006] In one embodiment, the exhaust passage is arranged to extend in a radial direction of the rotor core; and / or the exhaust passage is located in a middle portion of the rotor core along an axial direction of the rotor core.
[0007] In one embodiment, the width of the exhaust channel is L1, the maximum width of the rotor slot is L2, and L1 satisfies: 1 mm ≤ L1 ≤ L2;
[0008] And / or, the exhaust passages are arranged with equal width along the exhaust direction thereof.
[0009] In one embodiment, a plurality of the exhaust channels are provided on the rotor core, the plurality of the exhaust channels are connected to the plurality of the rotor slots one-to-one, and the plurality of the exhaust channels are all connected to the shaft hole.
[0010] In one embodiment, the rotor core includes a first rotor plate and a second rotor plate, the number of the first rotor plates is multiple, and the multiple first rotor plates are stacked in sequence along their axial direction, the second rotor plate is arranged between the multiple first rotor plates, and the exhaust channel is arranged on the second rotor plate.
[0011] In one embodiment, the number of the second rotor plate is one, and a plurality of the exhaust channels are provided on the second rotor plate. The number of the plurality of exhaust channels is the same as the number of the plurality of rotor slots, and each of the rotor slots is connected to the shaft hole through one exhaust channel.
[0012] In one embodiment, there are multiple second rotor sheets, and multiple exhaust channels are provided on the rotor core. The multiple exhaust channels are respectively provided on the multiple second rotor sheets, and the sum of the numbers of the exhaust channels on the multiple second rotor sheets is not less than the number of the multiple rotor slots, and each of the rotor slots is connected to the shaft hole through at least one exhaust channel.
[0013] In one embodiment, a plurality of the second rotor plates are stacked in sequence along the axial direction of the rotor core; or a plurality of the second rotor plates and at least one of the first rotor plates are stacked alternately in sequence.
[0014] In one embodiment, the sum of the numbers of the exhaust channels on the plurality of second rotor sheets is equal to the number of the plurality of rotor slots, the plurality of exhaust channels are evenly distributed on the plurality of second rotor sheets, the exhaust channels on any two of the second rotor sheets are staggered along the axial direction of the rotor core, and each of the rotor slots is connected to the axial hole through one exhaust channel.
[0015] In one embodiment, the exhaust passage is provided in the second rotor sheet in the form of a hole or a groove; and / or the second rotor sheet is located in the middle of the rotor core along the axial direction of the rotor core.
[0016] The utility model also provides an asynchronous motor, the asynchronous motor comprises an upper end ring, a lower end ring, a plurality of rotor guide bars and the rotor core as described above, the upper end ring and the lower end ring are arranged at both ends of the rotor core along its axial direction, and the plurality of rotor guide bars are arranged one by one in the plurality of rotor slots.
[0017] The rotor core of the utility model is provided with an axial hole, an exhaust channel and a plurality of rotor slots. The plurality of rotor slots are arranged around the axial hole on the rotor core. The axial hole is used to accommodate the rotating shaft, and the rotor slots are used to accommodate the rotor guide bars. At least some of the plurality of rotor slots are connected with the axial hole through the exhaust channel. With such an arrangement, when molten aluminum is cast in the rotor slots of the rotor core, the gas in the rotor slots can be directly discharged into the axial hole along the exhaust channel, that is, the gas in the rotor slots can be discharged smoothly, thus avoiding the problems of pores, fine lines, cracks and the like in the cast aluminum end rings and the aluminum guide bars caused by the poor exhaust effect of the cast aluminum rotor, ensuring the quality of the cast aluminum, and also being beneficial to increasing the density of aluminum in the cast aluminum rotor, thereby improving the performance of the motor. BRIEF DESCRIPTION OF THE DRAWINGS
[0018] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.
[0019] Figure 1 A schematic structural diagram of an embodiment of a rotor core provided by the utility model;
[0020] Figure 2 A partial structural schematic diagram of an embodiment of an asynchronous motor provided by the utility model;
[0021] Figure 3 A cross-sectional view of a part of the structure of an embodiment of an asynchronous motor provided by the utility model;
[0022] Figure 4 for Figure 3 A schematic diagram of the structure of the second rotor sheet in FIG.
[0023] Figure 5 A cross-sectional view of a part of the structure of another embodiment of the asynchronous motor provided by the utility model;
[0024] Figure 6 for Figure 5 Schematic diagram of the structure of the second rotor plate.
[0025] Description of Figure Numbers:
[0026] 10. rotor core; 100. shaft hole; 200. exhaust channel; 300. rotor slot; 400. first rotor sheet; 500. second rotor sheet;
[0027] 20. Upper end ring; 30. Lower end ring; 40. Rotor guide bar.
[0028] The realization of the purpose, functional features and advantages of the utility model will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION
[0029] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.
[0030] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back...), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components in a certain specific posture. If the specific posture changes, the directional indications will also change accordingly.
[0031] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the utility model, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features limited to "first" and "second" may explicitly or implicitly include at least one of the features. In addition, if "and / or" or "and / or" appears in the full text, its meaning includes three parallel solutions. Taking "A and / or B" as an example, it includes solution A, solution B, or solutions that satisfy both A and B. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in this field to implement. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the utility model.
[0032] The rotor core is formed by stacking a certain number of rotor sheets. There are a certain number of slots in the rotor core, and the molten aluminum is cast into it to form aluminum bars. Exhaust of existing cast aluminum rotors is usually achieved by casting aluminum molds, but due to the high speed of aluminum liquid injection, it is impossible to completely exhaust the air in the rotor cavity, resulting in pores, fine lines, cracks and other problems in the cast aluminum end rings and aluminum bars, thereby affecting the performance of the motor.
[0033] In order to solve the above problems, the utility model provides a rotor core and an asynchronous motor including the rotor core.
[0034] See also Figures 1 to 4 In one embodiment of the utility model, an axial hole 100, an exhaust channel 200 and a plurality of rotor slots 300 are provided on the rotor core 10; the plurality of rotor slots 300 are arranged around the axial hole 100 on the rotor core 10, the axial hole 100 is used to accommodate a rotating shaft (not shown), and the rotor slots 300 are used to accommodate rotor guide bars 40; at least some of the plurality of rotor slots 300 are connected to the axial hole 100 through the exhaust channel 200.
[0035] It is understandable that the rotor core 10 is provided with an axial hole 100, an exhaust channel 200 and a plurality of rotor slots 300, and the specific position and shape of the exhaust channel 200 are not limited, and the exhaust channel 200 only needs to be able to directly connect the rotor slot 300 and the axial hole 100. For example, the exhaust channel 200 can be arranged in a straight line, or in an arc line, or in a combination of a straight line and an arc line, which is not specifically limited here. The exhaust channel 200 and the rotor slot 300 can be connected one-to-one, or one exhaust channel 200 can be connected to a plurality of rotor slots 300, which is not specifically limited here.
[0036] Furthermore, the rotor slot 300 is also called a casting slot. When producing a cast aluminum rotor, the rotor core 10 is placed in a mold and a casting process is performed. Specifically, aluminum liquid is poured into the rotor slot 300 of the rotor core 10. The mold forms an end ring at each end of the rotor core 10, and multiple rotor bars 40 are formed in multiple rotor slots 300. The two end rings and the multiple rotor bars 40 are an integrated structure, which is also commonly referred to as a conductive cage. Since the rotor core 10 of the present application is provided with an axial hole 100, an exhaust channel 200 and multiple rotor slots 300, at least some of the multiple rotor slots 300 are connected to the axial hole 100 through the exhaust channel 200, so that when producing a cast aluminum rotor, the air in the rotor slot 300 can be directly discharged into the axial hole 100 along the exhaust channel 200, thereby avoiding the problems of pores, fine lines, cracks, etc. in the cast aluminum end rings and cast aluminum bars during the casting process, thereby ensuring the quality of the cast aluminum rotor.
[0037] Furthermore, the cast aluminum rotor may adopt a centrifugal casting process, specifically, the rotor core 10 is heated and aluminum liquid is poured into the mold under high-speed rotation, and the aluminum liquid is cast into aluminum bars, upper end ring 20 and lower end ring 30 by centrifugal force. When the aluminum liquid is poured into the rotor slot 300, the gas is directly discharged into the shaft hole 100 along the exhaust channel 200, and the aluminum liquid forms the rotor guide bar 40 in the rotor slot 300 under the action of centrifugal force.
[0038] Further, a plurality of rotor slots 300 can be directly connected to the shaft hole 100 through a plurality of exhaust channels 200, that is, a plurality of exhaust channels 200 are provided on the rotor core 10, and each exhaust channel 200 is connected to the shaft hole 100 and a rotor slot 300; of course, it is also possible that a part of the plurality of rotor slots 300 is directly connected to the shaft hole 100 through the exhaust channel 200, and another part of the rotor slots 300 is only exhausted through its own structure or through other methods, which is not limited to the specific method herein. The exhaust method of another part of the plurality of rotor slots 300 is, for example but not limited to: an open slot connected to the outside of the rotor core 10 is provided on the rotor slot 300 for exhaust; or, the rotor slot 300 is first connected to the outside of the rotor core 10, and then connected to the exhaust channel 200, that is, the rotor slot 300 is indirectly connected to the exhaust channel 200.
[0039] The rotor core 10 of the utility model is provided with an axial hole 100, an exhaust channel 200 and a plurality of rotor slots 300. The plurality of rotor slots 300 are arranged around the axial hole 100 on the rotor core 10. The axial hole 100 is used to accommodate the rotating shaft, and the rotor slots 300 are used to accommodate the rotor guide bars 40. At least some of the plurality of rotor slots 300 are connected with the axial hole 100 through the exhaust channel 200. With such an arrangement, when molten aluminum is cast in the rotor slots 300 of the rotor core 10, the gas in the rotor slots 300 can be directly discharged into the axial hole 100 along the exhaust channel 200, that is, the gas in the rotor slots 300 can be discharged smoothly, thereby avoiding the problems of pores, fine lines, cracks and the like in the cast aluminum end rings and the aluminum guide bars caused by the poor exhaust effect of the cast aluminum rotor, ensuring the quality of the cast aluminum, and also being beneficial to increasing the density of aluminum in the cast aluminum rotor, thereby improving the performance of the motor.
[0040] See also Figures 3 to 6 , one end of the exhaust channel 200 is connected to the corresponding rotor slot 300, and the other end of the exhaust channel 200 is connected to the shaft hole 100. It can be understood that one end of the exhaust channel 200 is connected to the corresponding rotor slot 300, that is, the exhaust channel 200 and the rotor slot 300 can be connected one-to-one, or one exhaust channel 200 is connected to multiple rotor slots 300, which is not specifically limited here. In addition, the exhaust channel 200 is arranged between the multiple rotor slots 300 and the shaft hole 100, and the exhaust channel 200 directly connects the rotor slot 300 and the shaft hole 100, which is conducive to shortening the length of the exhaust channel 200, increasing the speed of gas discharge into the shaft hole 100, and also improving the compactness of the internal structure of the rotor core 10.
[0041] In one embodiment, the exhaust passage 200 is arranged to extend in the radial direction of the rotor core 10. This is conducive to shortening the length of the exhaust passage 200, so that the gas in the rotor slot 300 can be quickly discharged into the shaft hole 100 along the radial direction of the rotor core 10, thereby facilitating improving the quality of the cast aluminum rotor.
[0042] In one embodiment, the exhaust passage 200 is located in the middle of the rotor core 10 along the axial direction of the rotor core 10. It is understandable that the rotor core 10 has a certain length along its axial direction. When the aluminum liquid is poured into the rotor slot 300 of the rotor core 10, the gas located in the middle of the rotor core 10 along its axial direction is the most difficult to discharge. In this embodiment, the exhaust passage 200 is located in the middle of the rotor core 10 along its axial direction, which improves the smoothness of the gas discharge in the rotor slot 300, thereby facilitating the improvement of the quality of the cast aluminum rotor.
[0043] In one embodiment, the exhaust channel 200 is arranged to extend in the radial direction of the rotor core 10, and the exhaust channel 200 is located in the middle of the rotor core 10 in the axial direction of the rotor core 10. Such an arrangement is conducive to shortening the length of the exhaust channel 200 and improving the smoothness of gas discharge in the rotor slot 300, thereby helping to improve the quality of the cast aluminum rotor.
[0044] In one embodiment, the width of the exhaust channel 200 is L1, the maximum width of the rotor slot 300 is L2, and L1 satisfies: 1mm≤L1≤L2. In this way, the width of the exhaust channel 200 is limited to a suitable range, ensuring that the gas can be discharged from the exhaust channel to the shaft hole 100, and when the cast aluminum rotor adopts the centrifugal casting process, the aluminum liquid in the rotor slot 300 is prevented from flowing out of the exhaust channel 200 to the shaft hole 100, thereby improving the reliability of the rotor core 10.
[0045] In one embodiment, the exhaust channel 200 is arranged with equal width along the exhaust direction thereof, so that the exhaust channel 200 can be easily processed on the rotor core 10 , which simplifies the structure of the rotor core 10 and reduces the manufacturing difficulty of the rotor core 10 .
[0046] In one embodiment, the length of the exhaust channel 200 along the radial direction of the rotor core 10 is greater than the length of the rotor slot 300 along the radial direction of the rotor core 10. In this way, the structure of the rotor core 10 in this embodiment cooperates with the centrifugal casting process to avoid the aluminum liquid in the rotor slot 300 flowing out of the exhaust channel 200 into the shaft hole 100, thereby improving the reliability of the rotor core 10.
[0047] See also Figure 4In one embodiment, the rotor core 10 is provided with a plurality of exhaust channels 200, and the plurality of exhaust channels 200 are connected one-to-one with the plurality of rotor slots 300, and the plurality of exhaust channels 200 are all connected with the shaft hole 100. With such a configuration, when producing a cast aluminum rotor, the gas in each rotor slot 300 can be directly discharged smoothly into the shaft hole 100 along the exhaust channel 200, ensuring that no pores, fine lines, cracks, etc. will be generated in the cast aluminum end ring and the plurality of cast aluminum guide bars during the casting process, thereby improving the quality of the cast aluminum rotor; and, the plurality of exhaust channels 200 are connected one-to-one with the plurality of rotor slots 300, so that the rotor core 10 has an axisymmetric structure, that is, the structure of the rotor core 10 is regular, so that the rotor core 10 is easy to manufacture, and is conducive to improving the reliability of the dynamic balance of the rotor core 10, thereby improving the reliability of the dynamic balance of the asynchronous motor.
[0048] See also Figures 3 to 6 The rotor core 10 includes a first rotor sheet 400 and a second rotor sheet 500. The number of the first rotor sheets 400 is multiple, and the multiple first rotor sheets 400 are stacked in sequence along the axial direction thereof. The second rotor sheet 500 is arranged between the multiple first rotor sheets 400, and the exhaust channel 200 is arranged on the second rotor sheet 500. In this arrangement, the first rotor sheet 400 and the second rotor sheet 500 have different structures, and the exhaust channel 200 is only arranged on the second rotor sheet 500. The second rotor sheet 500 can be arranged close to the middle of the entire rotor core 10 along the axial direction thereof. Since the gas located in the middle of the rotor core 10 along the axial direction thereof is the most difficult to be discharged, in this embodiment, the exhaust channel 200 is arranged on the second rotor sheet 500 located in the middle, which improves the smoothness of the gas discharge in the rotor slot 300, thereby facilitating the improvement of the quality of the cast aluminum rotor.
[0049] See also Figure 3 and Figure 4In one embodiment, the number of the second rotor sheet 500 is one, and the second rotor sheet 500 is provided with a plurality of exhaust channels 200, the number of the plurality of exhaust channels 200 being the same as the number of the plurality of rotor slots 300, and each of the rotor slots 300 is connected to the shaft hole 100 through one exhaust channel 200. With such an arrangement, when producing a cast aluminum rotor, the gas in the plurality of rotor slots 300 can be directly and smoothly discharged into the shaft hole 100 along the corresponding exhaust channels 200 on the second rotor sheet 500, ensuring that there will be no pores, fine lines, cracks, and other problems in the cast aluminum end ring and the plurality of cast aluminum guide bars during the casting process, thereby improving the quality of the cast aluminum rotor; and, providing a plurality of exhaust channels 200 on one second rotor sheet 500 is conducive to simplifying the structure of the rotor core 10 and reducing the difficulty of manufacturing. In addition, the multiple exhaust channels 200 on the second rotor plate 500 are connected one-to-one with the multiple rotor slots 300, so that the rotor core 10 has an axisymmetric structure, that is, the structure of the rotor core 10 is regular, which makes the rotor core 10 easy to manufacture and is beneficial to improving the reliability of the dynamic balance of the rotor core 10, thereby improving the reliability of the dynamic balance of the asynchronous motor.
[0050] See also Figure 5 and Figure 6 In one embodiment, there are multiple second rotor sheets 500, and multiple exhaust channels 200 are provided on the rotor core 10. The multiple exhaust channels 200 are respectively provided on multiple second rotor sheets 500. The sum of the numbers of the exhaust channels 200 on the multiple second rotor sheets 500 is not less than the number of the multiple rotor slots 300, and each of the rotor slots 300 is connected to the shaft hole 100 through at least one exhaust channel 200.
[0051] It can be understood that the number of the second rotor sheets 500 is multiple, that is, the number of the second rotor sheets 500 is at least two, for example, the number of the second rotor sheets 500 is two, or three, or four, or five, etc., which is not specifically limited here. The multiple exhaust channels 200 are arranged on the multiple second rotor sheets 500, that is, the number of the second rotor sheets 500 is multiple, and each second rotor sheet 500 is provided with an exhaust channel 200. The number of exhaust channels 200 on the multiple second rotor sheets 500 can be the same or different. The sum of the number of exhaust channels 200 on the multiple second rotor sheets 500 can be greater than the number of the multiple rotor slots 300 on the rotor core 10, or the sum of the number of exhaust channels 200 on the multiple second rotor sheets 500 is equal to the number of the multiple rotor slots 300 on the rotor core 10, thereby ensuring that each rotor slot 300 can be connected to the shaft hole 100 through at least one exhaust channel 200.
[0052] See also Figure 5In one embodiment, a plurality of second rotor sheets 500 are stacked in sequence along the axial direction of the rotor core 10. In this way, a plurality of second rotor sheets 500 are stacked in sequence to form a second rotor sheet group, the second rotor sheet group is arranged between a plurality of first rotor sheets 400, and no first rotor sheet 400 is arranged between two adjacent second rotor sheets 500. A plurality of exhaust channels 200 are arranged on the second rotor sheet group formed by the plurality of second rotor sheets 500. When the plurality of first rotor sheets 400 and the plurality of second rotor sheets 500 are stacked, the position of the second rotor sheet group formed by the plurality of second rotor sheets 500 is not easy to be stacked incorrectly, that is, this embodiment is conducive to simplifying the manufacturing process of the rotor core 10, thereby reducing the manufacturing difficulty of the rotor core 10. Of course, the second rotor sheet group formed by the plurality of second rotor sheets 500 can be arranged in the middle of the rotor core 10 along its axial direction, so as to improve the smoothness of the gas discharge in the rotor slot 300.
[0053] In one embodiment, a plurality of the second rotor plates 500 and at least one of the first rotor plates 400 are alternately stacked in sequence. In this arrangement, one first rotor plate 400, or two first rotor plates 400, or three first rotor plates 400 are arranged between two adjacent second rotor plates 500. The number of first rotor plates 400 arranged between two adjacent second rotor plates 500 is not specifically limited, as long as each rotor slot 300 can be connected to the shaft hole 100 through at least one exhaust channel 200.
[0054] See also Figure 5 and Figure 6 In one embodiment, the sum of the number of the exhaust channels 200 on the plurality of second rotor sheets 500 is equal to the number of the plurality of rotor slots 300, and the plurality of exhaust channels 200 are evenly distributed on the plurality of second rotor sheets 500. The exhaust channels 200 on any two of the second rotor sheets 500 are staggered along the axial direction of the rotor core 10, and each of the rotor slots 300 is connected to the shaft hole 100 through one exhaust channel 200. In this way, the plurality of exhaust channels 200 on each second rotor sheet 500 can be evenly distributed, and the plurality of exhaust channels 200 on any two of the second rotor sheets 500 do not overlap along the axial direction of the rotor core 10. The overall structure of the rotor core 10 is regular, ensuring that each rotor slot 300 can be directly connected to the shaft hole 100 through one exhaust channel 200, thereby ensuring the quality of the cast aluminum rotor, and also facilitating the improvement of the reliability of the dynamic balance when the rotor core 10 rotates, thereby improving the reliability of the dynamic balance of the asynchronous motor.
[0055] To facilitate understanding of the above embodiment, the number of the second rotor sheets 500 is two as an example for description. The two second rotor sheets 500 are divided into a first sub-rotor sheet and a second sub-rotor sheet. The plurality of first rotor sheets 400 are stacked in sequence. The two second rotor sheets 500 are arranged between the plurality of first rotor sheets 400. Figure 5 and Figure 6 As shown, the rotor core 10 is provided with 40 rotor slots 300, each of the first rotor sheet 400 and each of the second rotor sheet 500 is correspondingly provided with 40 rotor slots 300, and the first sub-rotor sheet and the second sub-rotor sheet are each provided with 20 exhaust channels 200, and the 20 exhaust channels 200 on the first sub-rotor sheet and the 20 exhaust channels 200 on the second sub-rotor sheet are staggered along the axial direction of the rotor core 10, that is, the projection of any exhaust channel 200 on the first sub-rotor sheet along the axial direction of the rotor core 10 on the second sub-rotor sheet is spaced from the exhaust channel 200 on the second sub-rotor sheet, that is, the projection of any exhaust channel 200 on the first sub-rotor sheet along the axial direction of the rotor core 10 on the second sub-rotor sheet is spaced from the exhaust channel 200 on the second sub-rotor sheet. The exhaust channels 200 on the sub-pieces do not overlap, thereby ensuring that the 20 exhaust channels 200 on the first sub-rotor piece can be connected one-to-one with 20 of the 40 rotor slots 300, and the 20 exhaust channels 200 on the second sub-rotor piece can be connected one-to-one with the other 20 of the 40 rotor slots 300, thereby achieving that each rotor slot 300 is connected to the shaft hole 100 through an exhaust channel 200, and the gas in each rotor slot 300 can be directly discharged into the shaft hole 100 along the exhaust channel 200, thereby ensuring the quality of the cast aluminum rotor, and the overall structure of the rotor core 10 is regular, which is conducive to improving the reliability of dynamic balancing when the rotor core 10 rotates, thereby improving the reliability of dynamic balancing of the asynchronous motor.
[0056] In one embodiment, the exhaust channel 200 is provided in a hole shape or a groove shape on the second rotor sheet 500. This makes it easy to process and shape the exhaust channel 200, which simplifies the structure of the rotor core 10 and reduces the manufacturing difficulty of the rotor core 10.
[0057] In one embodiment, the second rotor sheet 500 is located in the middle of the rotor core 10 along the axial direction of the rotor core 10. It is understandable that the rotor core 10 has a certain length along its axial direction. When the aluminum liquid is poured into the rotor slot 300 of the rotor core 10, the gas located in the middle of the rotor core 10 along its axial direction is the most difficult to discharge. In this embodiment, the exhaust channel 200 is provided on the second rotor sheet 500, and the second rotor sheet 500 is provided in the middle of the rotor core 10 along its axial direction, which is conducive to improving the smoothness of the gas in the rotor slot 300 to be discharged to the shaft hole 100, thereby improving the quality of the cast aluminum rotor.
[0058] The utility model also proposes an asynchronous motor, which includes an upper end ring 20, a lower end ring 30, a plurality of rotor guide bars 40 and the rotor core 10 as described above. The specific structure of the rotor core 10 refers to the above embodiment. Since the asynchronous motor adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought by the technical solutions of the above embodiments, which will not be described one by one here.
[0059] In one embodiment, the upper end ring 20 and the lower end ring 30 are arranged at both ends of the rotor core 10 along the axial direction thereof, and the plurality of rotor bars 40 are arranged one-to-one in the plurality of rotor slots 300. When producing a cast aluminum rotor, the rotor core 10 is placed in a mold and a casting process is performed, specifically, aluminum liquid is poured into the rotor slots 300 of the rotor core 10, and the upper end ring 20 and the lower end ring 30 are respectively formed at both ends of the rotor core 10 through the mold, and a plurality of rotor bars 40 are formed in the plurality of rotor slots 300, wherein the upper end ring 20, the lower end ring 30 and the plurality of rotor bars 40 are an integrated structure after casting, which is also generally referred to as a conductive squirrel cage. Since the rotor core 10 of the asynchronous motor is provided with an axial hole 100, an exhaust channel 200 and a plurality of rotor slots 300, at least some of the plurality of rotor slots 300 are connected with the axial hole 100 through the exhaust channel 200, so that when the cast aluminum rotor is produced, the air in the rotor slot 300 can be directly discharged into the axial hole 100 along the exhaust channel 200, thereby avoiding the problems of pores, fine lines, cracks, etc. in the cast aluminum end ring and the cast aluminum guide bar during the casting process, ensuring the quality of the cast aluminum rotor, thereby improving the performance of the asynchronous motor.
[0060] The above description is only an exemplary embodiment of the present invention, and does not limit the patent scope of the present invention. All equivalent structural changes made by using the contents of the present invention specification and drawings under the technical concept of the present invention, or directly / indirectly applied in other related technical fields are included in the patent protection scope of the present invention.
Claims
1. A rotor core, characterized in that: The rotor core is provided with an axial hole, an exhaust channel and a plurality of rotor slots; the plurality of rotor slots are arranged around the axial hole on the rotor core, the axial hole is used to accommodate the rotating shaft, and the rotor slots are used to accommodate the rotor guide bars; at least some of the plurality of rotor slots are connected to the axial hole through the exhaust channel.
2. The rotor core according to claim 1, characterized in that: One end of the exhaust passage is communicated with the corresponding rotor slot, and the other end of the exhaust passage is communicated with the shaft hole.
3. The rotor core according to claim 1, characterized in that: The exhaust channel is arranged to extend in the radial direction of the rotor core; and / or the exhaust channel is located in the middle of the rotor core along the axial direction of the rotor core.
4. The rotor core according to claim 1, characterized in that: The width of the exhaust channel is L1, the maximum width of the rotor slot is L2, and L1 satisfies: 1mm≤L1≤L2; And / or, the exhaust passages are arranged with equal width along the exhaust direction thereof.
5. The rotor core according to any one of claims 1 to 4, characterized in that: The rotor core is provided with a plurality of exhaust channels, the plurality of exhaust channels are connected to the plurality of rotor slots one-to-one, and the plurality of exhaust channels are all connected to the shaft hole.
6. The rotor core according to any one of claims 1 to 4, characterized in that: The rotor core includes a first rotor sheet and a second rotor sheet. There are multiple first rotor sheets, which are stacked in sequence along their axial direction. The second rotor sheet is arranged between the multiple first rotor sheets, and the exhaust channel is arranged on the second rotor sheet.
7. The rotor core according to claim 6, characterized in that: The number of the second rotor sheet is one, and a plurality of the exhaust channels are provided on the second rotor sheet. The number of the plurality of exhaust channels is the same as the number of the plurality of rotor slots, and each of the rotor slots is connected to the shaft hole through one exhaust channel.
8. The rotor core according to claim 6, characterized in that: There are multiple second rotor sheets, and multiple exhaust channels are provided on the rotor core. The multiple exhaust channels are arranged on multiple second rotor sheets. The sum of the numbers of the exhaust channels on the multiple second rotor sheets is not less than the number of the multiple rotor slots. Each of the rotor slots is connected to the shaft hole through at least one exhaust channel.
9. The rotor core according to claim 8, characterized in that: A plurality of the second rotor sheets are stacked in sequence along the axial direction of the rotor core; or a plurality of the second rotor sheets and at least one of the first rotor sheets are stacked alternately in sequence.
10. The rotor core according to claim 9, characterized in that: The sum of the numbers of the exhaust channels on the multiple second rotor sheets is equal to the number of the multiple rotor slots. The multiple exhaust channels are evenly distributed on the multiple second rotor sheets. The exhaust channels on any two of the second rotor sheets are staggered along the axial direction of the rotor core. Each of the rotor slots is connected to the axial hole through one exhaust channel.
11. The rotor core according to claim 6, characterized in that: The exhaust passage is provided in the second rotor sheet in the shape of a hole or a groove; and / or the second rotor sheet is located in the middle of the rotor core along the axial direction of the rotor core.
12. An asynchronous motor, characterized in that: It comprises an upper end ring, a lower end ring, a plurality of rotor bars and a rotor core as claimed in any one of claims 1 to 11, wherein the upper end ring and the lower end ring are arranged at both ends of the rotor core along its axial direction, and the plurality of rotor bars are arranged one-to-one in the plurality of rotor slots.