Permanent magnet motor rotor

Abstract

The utility model relates to a permanent magnet motor rotor, comprising a rotating shaft which comprises a shaft body and a plurality of radial plates which are formed by radially extending outwards from the surface of the shaft body, and baffle plates are arranged among the plurality of radial plates; the rotor core comprises a plurality of overlapped rotor punching sheets, permanent magnets embedded in the rotor punching sheets and radial ventilation assemblies for separating the rotor punching sheets, the rotor punching sheets are provided with mounting holes penetrating through the upper and lower surfaces of the rotor punching sheets, the outer ends of the radial plates abut against the inner walls of the mounting holes, and the radial ventilation assemblies separate the plurality of overlapped rotor punching sheets. A radial ventilation area is formed, and the radial ventilation area is communicated with the space among the radial plates; the fan is connected to one end of the rotating shaft in a sleeving manner; the axial suction force is generated through the fan, and hot air in the motor is firstly subjected to axial movement and then is subjected to radial movement, so that comprehensive cooling of the rotor is realized, and the cooling effect of the rotor iron core is improved.

Description

Technical Field

[0001] This invention relates to the field of permanent magnet motor technology, and more particularly to a permanent magnet motor rotor. Background Technology

[0002] Given the increasingly severe energy problem, high-efficiency and energy-saving electrical equipment is gradually becoming mainstream. This has strongly promoted the rapid development of rare-earth permanent magnet motors, which have high power density and high efficiency. Permanent magnet motors are widely used in transportation, industry, and other fields due to their advantages such as high power density and high energy efficiency. However, the rotor of a high-power permanent magnet motor generates a lot of heat during operation. If heat dissipation is not timely and effective, it can lead to excessively high internal temperatures, causing electrical faults; it can also cause deformation or accelerated wear of mechanical parts; it can cause a decline in the magnetic properties of the magnets, or even demagnetization, resulting in a significant decrease in motor torque and efficiency. Poor heat dissipation performance of the motor itself can also cause abnormal load response, affecting the normal operation of production lines or equipment, and may even lead to the paralysis of the entire system, causing incalculable losses. On the other hand, the way the permanent magnets are fixed in the rotor is also very important, directly affecting the reliability and lifespan of the permanent magnet motor.

[0003] According to Chinese patent CN218633506U, a motor rotor is disclosed. The rotor achieves heat dissipation by forming an airflow path through fans installed at both ends of the shaft and radial ventilation slots in the rotor. However, due to assembly reasons, the outer diameter of the fan blades on the rotor is lower than the outer diameter of the rotor core. In situations with high torque and low speed, it cannot provide sufficient airflow to effectively dissipate heat from the motor. Secondly, in actual heat dissipation, most of the airflow passes through the axial ventilation holes, and the airflow through the radial ventilation slots is relatively small, which affects the radial cooling effect of the rotor core.

[0004] Therefore, it is necessary to develop a permanent magnet motor rotor to solve the above problems. Utility Model Content

[0005] The purpose of this invention is to provide a permanent magnet motor rotor with good cooling effect.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a permanent magnet motor rotor, comprising:

[0007] A rotating shaft includes a shaft body and a plurality of spokes extending radially outward from the surface of the shaft body, with baffles provided between the plurality of spokes;

[0008] The rotor core includes multiple overlapping rotor laminations, permanent magnets embedded in the rotor laminations, and a radial ventilation assembly that separates the rotor laminations. Each rotor lamination has a mounting hole penetrating its upper and lower surfaces. The outer end of each spoke abuts against the inner wall of the mounting hole. The radial ventilation assembly separates the multiple overlapping rotor laminations to form a radial ventilation area. The radial ventilation area communicates with the space between the spokes.

[0009] A fan is fitted onto one end of the rotating shaft.

[0010] Furthermore, the radial ventilation assembly includes a first ventilation fixing plate fixed to the rotor lamination and a second ventilation fixing plate fixed to another adjacent rotor lamination, with a channel steel provided between the first ventilation fixing plate and the second ventilation fixing plate.

[0011] Furthermore, the first ventilation fixing plate and the second ventilation fixing plate are arranged opposite to each other, and each of them is recessed inward from the opposite side to form a groove, and the two ends of the channel steel extend into the groove respectively.

[0012] Furthermore, the number of spokes is six, and the six spokes are arranged at equal intervals, with the baffles located between the six spokes respectively.

[0013] Furthermore, the baffle is a fan-shaped plate, which is fixedly connected to the surface of the plurality of spokes.

[0014] Furthermore, the rotor lamination has several mounting slots, which penetrate the upper and lower surfaces of the rotor lamination and surround the mounting hole, and the permanent magnet is disposed in the mounting slot.

[0015] Furthermore, fixing components are installed on both sides of the rotor lamination. The fixing components include pressure plates and fixing baffles. The pressure plates cover the outer sides of both ends of the rotor lamination, and the fixing baffles are fastened to the pressure plates.

[0016] Furthermore, the rotor lamination has several through holes that penetrate the upper and lower surfaces of the rotor lamination and surround the mounting hole. A long screw is provided in the through hole, and the long screw passes through the pressure plate, the fixing baffle and the through hole in sequence.

[0017] Furthermore, the front end of the fan forms an air outlet area, and its rear end forms an air inlet area, which is located on the outside of the rotor core.

[0018] Furthermore, a counterweight ring is installed at the other end of the rotating shaft, and the counterweight ring is sleeved on the rotating shaft.

[0019] Compared with the prior art, the beneficial effects of this utility model are as follows: This utility model is a permanent magnet motor rotor with good cooling effect. By generating axial suction through a fan, the hot air inside the motor is first moved axially and then radially, so as to achieve comprehensive cooling of the rotor and improve the cooling effect of the rotor core. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort, wherein:

[0021] Figure 1 This is a side sectional view of a permanent magnet motor rotor according to the present invention.

[0022] Figure 2 for Figure 1 The diagram shows the rotating shaft structure of the permanent magnet motor rotor.

[0023] Figure 3 for Figure 2 A cross-sectional view of the rotating shaft of the permanent magnet motor rotor shown.

[0024] Figure 4 for Figure 1 The diagram shows a plan view of the rotor core of a permanent magnet motor.

[0025] Figure 5 for Figure 1 A partial sectional view of the rotor core of the permanent magnet motor rotor shown.

[0026] Figure 6 for Figure 1 A partial sectional view of the fixing assembly of the rotor core of the permanent magnet motor rotor shown.

[0027] In the diagram: 1. Rotating shaft; 2. Rotor core; 3. Fan; 11. Shaft body; 12. Spoke plate; 13. Baffle plate; 21. Rotor lamination; 22. Radial ventilation assembly; 23. Fixing assembly; 211. Mounting hole; 212. Mounting slot; 213. Through hole; 24. Permanent magnet; 25. Long screw; 221. First ventilation fixing plate; 222. Second ventilation fixing plate; 223. Channel steel; 224. Slot; 225. Radial ventilation area; 231. Pressure plate; 232. Fixing baffle plate; 31. Outer shell; 32. Fan blade; 33. Air outlet area; 34. Air inlet area; 4. Counterweight ring. Detailed Implementation

[0028] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0029] Please refer to Figures 1 to 6 This utility model is a permanent magnet motor rotor, which includes a rotating shaft 1, a rotor core 2 sleeved on the rotating shaft 1, and a fan 3.

[0030] Please refer to Figures 1 to 3 The rotating shaft 1 includes a shaft body 11, a plurality of spokes 12 extending outward from the surface of the shaft body 11, and baffles 13 located between the plurality of spokes 12. The diameter of the shaft body 11 can be changed according to requirements. One end of the plurality of spokes 12 is fixedly connected to the shaft body 11, and the other end extends radially outward. The number of spokes 12 can be changed according to requirements. In this embodiment, there are six spokes 12, which are arranged at equal intervals. The baffles 13 are located between the six spokes 12 and are placed at one end of the plurality of spokes 12. The baffles 13 are fan-shaped plates and are fixedly connected to the surfaces between the plurality of spokes 12.

[0031] Please refer to Figure 1 and Figure 4 The rotor core 2 includes rotor laminations 21, radial ventilation components 22 that separate the rotor laminations 21, and fixing components 23 that fix the rotor laminations 21. The rotor laminations 21 are annular plates with mounting holes 211 located at their center. The number of rotor laminations 21 can be changed according to requirements. Several rotor laminations 21 are stacked and sleeved on the rotating shaft 1. Specifically, several rotor laminations 21 are sleeved on the spokes 12, that is, the shaft 11 and the spokes 12 pass through the mounting holes 211, and the outer end of the spokes 12 abuts against the inner diameter of the rotor laminations 21.

[0032] The rotor lamination 21 has several mounting slots 212 that penetrate the upper and lower surfaces of the rotor lamination 21 and surround the mounting hole 211. A permanent magnet 24 is provided in the mounting slot 212. The rotor lamination 21 also has several through holes 213 that penetrate the upper and lower surfaces of the rotor lamination 21 and surround the mounting hole 211. A long screw 25 is provided in the through holes 213.

[0033] Please refer to Figure 1 and Figure 5The radial ventilation assembly 22 includes a first ventilation fixing plate 221, a second ventilation fixing plate 222, and a channel steel 223 disposed between the first and second ventilation fixing plates 221 and 222. The first ventilation fixing plate 221 is fixed to the rotor lamination 21, and the second ventilation fixing plate 222 is fixed to another adjacent rotor lamination 21. The first and second ventilation fixing plates 221 and 222 are arranged opposite to each other, and each is recessed inward from its opposite side to form a slot 224. The two ends of the channel steel 223 extend into the slot 224 respectively, separating adjacent rotor laminations 21. A radial ventilation area 225 is formed between the separated rotor laminations 21, and the radial ventilation area 225 communicates with the space between the plurality of spokes 12. Preferably, the radial ventilation assembly 22 does not separate each rotor lamination 21; multiple rotor laminations 21 are usually stacked to form a group, and the radial ventilation assembly 22 separates each group of rotor laminations 21.

[0034] Please refer to Figure 1 and Figure 6 The fixing components 23 are respectively installed on the outer sides of both ends of the rotor lamination 21. They include pressure plates 231 and fixing baffles 232. The pressure plates 231 cover the outer sides of both ends of the rotor lamination 21, and the fixing baffles 232 are fastened to the pressure plates 231. Long bolts 25 pass through the pressure plates 231 and the fixing baffles 232 in sequence and are fixedly connected to the rotor lamination 21.

[0035] The fan 3 is sleeved on one end of the rotating shaft 1. It includes a housing 31 and a fan blade 32. The fan blade 32 is located inside the housing 31. The housing 31 is sleeved on the rotating shaft 1. The front end of the fan 3 forms an air outlet area 33, and its rear end forms an air inlet area 34. The air inlet area 34 is located outside the rotor core 2.

[0036] In another embodiment, a counterweight ring 4 is installed at the other end of the rotating shaft 1. The counterweight ring 4 is sleeved on the rotating shaft 1 to balance the weight of the fan 3.

[0037] This utility model relates to a permanent magnet motor rotor. In use, the rotating shaft 1, rotor core 2, and fan 3 rotate synchronously. The fan 3 rotates, generating axial suction. Hot air in the inlet area 34 is carried by the fan 3 to the outlet area 33, while the remaining hot air inside the motor moves towards the inlet area 34. Specifically, the hot air first enters between several spokes 12. When the hot air enters the center of the rotor laminations 21, it is blocked by baffles 13. The hot air then passes through the radial ventilation areas 225 formed between the separated rotor laminations 21, reaches the inlet area 34 via the outside of the rotor laminations 21, and is then discharged from the outlet area 33, forming an airflow path.

[0038] This utility model is a permanent magnet motor rotor with good cooling effect. By generating axial suction force through a fan, the hot air inside the motor is first moved axially and then radially, so as to achieve comprehensive cooling of the rotor and improve the cooling effect of the rotor core.

[0039] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A permanent magnet motor rotor, characterized in that, It includes: The rotating shaft (1) includes a shaft body (11) and a plurality of spokes (12) extending radially outward from the surface of the shaft body (11), with baffles (13) provided between the plurality of spokes (12); The rotor core (2) includes multiple overlapping rotor laminations (21), permanent magnets (24) embedded in the rotor laminations (21), and radial ventilation components (22) separating the rotor laminations (21). The rotor laminations (21) have mounting holes (211) penetrating their upper and lower surfaces. The outer ends of the spokes (12) abut against the inner wall of the mounting holes (211). The radial ventilation components (22) separate the multiple overlapping rotor laminations (21) to form a radial ventilation area (225). The radial ventilation area (225) communicates with the space between the spokes (12). The fan (3) is fitted onto one end of the rotating shaft (1).

2. The permanent magnet motor rotor according to claim 1, characterized in that, The radial ventilation assembly (22) includes a first ventilation fixing plate (221) fixed to the rotor lamination (21) and a second ventilation fixing plate (222) fixed to another adjacent rotor lamination (21), with a channel steel (223) provided between the first ventilation fixing plate (221) and the second ventilation fixing plate (222).

3. The permanent magnet motor rotor according to claim 2, characterized in that, The first ventilation fixing plate (221) and the second ventilation fixing plate (222) are arranged opposite to each other, and each of them is recessed inward from the opposite side to form a slot (224), and the two ends of the channel steel (223) extend into the slot (224) respectively.

4. The permanent magnet motor rotor according to claim 1, characterized in that, The number of spokes (12) is six, and the six spokes (12) are arranged at equal intervals. The baffles (13) are located between the six spokes (12).

5. The permanent magnet motor rotor according to claim 4, characterized in that, The baffle (13) is a fan-shaped plate and is fixedly connected to the surfaces of several spokes (12).

6. The permanent magnet motor rotor according to claim 1, characterized in that, The rotor lamination (21) has a plurality of mounting slots (212), which penetrate the upper and lower surfaces of the rotor lamination (21) and surround the mounting hole (211). The permanent magnet (24) is disposed in the mounting slots (212).

7. The permanent magnet motor rotor according to claim 1, characterized in that, Fixing components (23) are installed on both sides of the rotor lamination (21). The fixing components (23) include pressure plates (231) and fixing baffles (232). The pressure plates (231) cover the outer sides of both ends of the rotor lamination (21), and the fixing baffles (232) are fastened to the pressure plates (231).

8. The permanent magnet motor rotor according to claim 7, characterized in that, The rotor lamination (21) has several through holes (213), which penetrate the upper and lower surfaces of the rotor lamination (21) and surround the mounting hole (211). A long screw (25) is provided in the through hole (213), which passes through the pressure plate (231), the fixing baffle (232) and the through hole (213) in sequence.

9. The permanent magnet motor rotor according to claim 1, characterized in that, The front end of the fan (3) forms an air outlet area (33), and the rear end forms an air inlet area (34), which is located outside the rotor core (2).

10. The permanent magnet motor rotor according to claim 1, characterized in that, A counterweight ring (4) is installed at the other end of the rotating shaft (1), and the counterweight ring (4) is sleeved on the rotating shaft (1).

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