Multi-section rotor structure of permanent magnet synchronous motor

Abstract

The utility model relates to a multi-section rotor structure of a permanent magnet synchronous motor. The structure comprises a rotating shaft and a plurality of iron cores which are arranged on the rotating shaft at intervals, a separation assembly is arranged between every two adjacent iron cores, each separation assembly comprises a pressing block and a positioning sleeve, each positioning sleeve comprises a cylinder part, a first-class through hole is formed in each cylinder part, and the rotating shaft is sleeved with the cylinder parts through the first-class through holes; the end faces of the two ends of the positioning sleeve are in contact fit with the end faces of the iron cores on the two sides, the pressing block comprises a main body part, the main body part is provided with a second-class through hole, a weight reduction structure is further arranged on the portion, located on the outer side of the second-class through hole, of the main body part, and the positioning sleeve is sleeved with the pressing block through the second-class through hole; the inner wall of the second type of through hole of the pressing block is in contact fit with the outer surface of the positioning sleeve, the ratio of the outer diameter of the main body part of the pressing block to the outer diameter of the iron core is 0.7: 1-1: 1, and the end faces of the two ends of the main body part are in contact fit with the end faces of the iron cores on the two sides. The structure is beneficial for reducing the deformation of the rotor.

Description

Technical Field

[0001] The utility model relates to a rotor structure of a motor, in particular to a multi-section rotor structure of a permanent magnet synchronous motor. Background Art

[0002] A permanent magnet synchronous motor is composed of components such as a stator, a rotor, and an end cover. For some high-power permanent magnet synchronous motors, two sections of rotor cores need to be installed on the rotating shaft. The existing multi-section rotor type permanent magnet synchronous motor has the following deficiencies: multiple cores are arranged on a rotating shaft at intervals, and a separating component is arranged between adjacent two cores. As Figure 1 shown, the existing separating component includes multiple pressing plates 101, a pressing sleeve 102, and a positioning sleeve 103. The overall structure is complex, and the assembly difficulty is high. Moreover, since the outer diameter of the positioning sleeve 103 is small and there is no supporting structure outside the positioning sleeve 103, the deflection of the rotating shaft of this structure is large, and the corresponding part of the rotating shaft of the positioning sleeve 103 is prone to deformation, and the deformation amount is large. Summary of the Utility Model

[0003] Based on this, a multi-section rotor structure of a permanent magnet synchronous motor is provided. The separating component of the multi-section rotor structure is beneficial to reducing the deformation amount of the rotating shaft.

[0004] A multi-section rotor structure of a permanent magnet synchronous motor includes a rotating shaft and a plurality of cores arranged at intervals on the rotating shaft. A separating component is arranged between adjacent two cores. The separating component includes a pressing block and a positioning sleeve.

[0005] The positioning sleeve includes a cylindrical body part. A first type of through hole is arranged in the cylindrical body part. The cylindrical body part is sleeved on the rotating shaft through the first type of through hole. The end faces at both ends of the positioning sleeve are in contact and cooperation with the end faces of the cores on both sides.

[0006] The pressing block includes a main body part. A second type of through hole is arranged in the main body part. A weight-reducing structure is further arranged on the main body part outside the second type of through hole. The pressing block is sleeved on the positioning sleeve through the second type of through hole. The inner wall of the second type of through hole of the pressing block is in contact and cooperation with the outer surface of the positioning sleeve. The ratio of the outer diameter of the main body part of the pressing block to the outer diameter of the core is 0.7:1 to 1:1. The end faces at both ends of the main body part are in contact and cooperation with the end faces of the cores on both sides.

[0007] In one embodiment, the weight-reducing structure includes a plurality of third type of through holes arranged along the circumferential direction of the second type of through hole. There is a rib plate structure between adjacent two third type of through holes. One end of each rib plate close to the second type of through hole is connected to a first annular transition part, and one end of each rib plate far from the second type of through hole is connected to a second annular transition part.

[0008] In one embodiment, an annular groove is provided on the outer surface of the main body portion of the pressing block. On both sides of the annular groove are annular convex portions, and the outer diameter of the annular convex portions is the same as the outer diameter of the iron core.

[0009] In one embodiment, the main body portion of the pressing block is cylindrical.

[0010] In one embodiment, one end of the third type of through hole close to the second type of through hole is the small end, and the end of the third type of through hole far from the second type of through hole is the large end.

[0011] In one embodiment, the positioning sleeve is cylindrical in shape.

[0012] In one embodiment, a first type of stepped structure is provided at one end of the cylindrical body portion of the positioning sleeve, and a second type of stepped structure for cooperating with the first type of stepped structure is provided at one end of the second type of through hole of the pressing block.

[0013] In one embodiment, the material of the pressing block is an aluminum alloy material, and the material of the positioning sleeve is a steel material.

[0014] In one embodiment, the number of the iron cores is 2.

[0015] In one embodiment, the ratio of the outer diameter of the main body portion of the pressing block to the outer diameter of the iron core is 1:1.

[0016] The beneficial effects of this application are as follows:

[0017] 1. The structure of this application is simple. The isolation component has only 2 parts, namely the pressing block and the positioning sleeve. This makes the overall structure of the isolation component of this application simple, with a lower assembly difficulty and a higher assembly efficiency.

[0018] 2. The ratio of the outer diameter of the main body portion of the pressing block of this application to the outer diameter of the iron core is 0.7:1 to 1:1, which can effectively reduce the deformation amount of the rotating shaft. Through simulation calculation, after using the above isolation component of this application on the rotor structure, the rotor deformation amount can be reduced by about 85%. It can effectively prevent the rotating shaft from deforming to a large extent.

[0019] 3. A plurality of third type of through holes are provided along the circumferential direction of the second type of through hole on the main body portion of the pressing block of this application. There is a rib structure between adjacent two third type of through holes. One end of each rib close to the second type of through hole is connected to the first annular transition portion, and one end of each rib far from the second type of through hole is connected to the second annular transition portion. The above structure of this application makes the overall strength of the pressing block higher and the mass lighter.

[0020] 4. An annular groove is provided on the outer surface of the main body of the pressing block in this application. Both sides of the annular groove are annular protruding parts, and the outer diameter of the annular protruding parts is the same as the outer diameter of the iron core. On the one hand, this can help reduce the deformation of the rotor. On the other hand, through the cooperation of the clamping tool and the annular groove, it is convenient to disassemble the pressing block from the rotating shaft.

[0021] 5. A first type of step structure is provided at one end of the cylindrical part of the positioning sleeve, and a second type of step for cooperating with the first type of step is provided at one end of the pressing block, so that the pressing block can be well positioned. Description of the Drawings

[0022] Figure 1 It is a schematic diagram of the isolation component in the prior art.

[0023] Figure 2 It is a schematic diagram of the multi-section rotor structure of the permanent magnet synchronous motor in the embodiment of this application.

[0024] Figure 3 It is a schematic diagram of the pressing block in the embodiment of this application.

[0025] Figure 4 It is a side view of the positioning sleeve in the embodiment of this application.

[0026] Figure 5 It is a three-dimensional view of the positioning sleeve in the embodiment of this application.

[0027] Figure 6 It is a schematic diagram of the cooperation between the first type of step and the second type of step in the embodiment of this application.

[0028] Among them:

[0029] 201. Pressing block; 202. Positioning sleeve; 203. Iron core; 204. Rotating shaft;

[0030] 2011. Second type of through hole; 2012. Third type of through hole; 2013. Rib plate; 2014. First annular transition part; 2015. Second annular transition part; 2016. Annular groove; 2017. Protruding part; 2018. Second type of step structure;

[0031] 2021. Cylindrical part; 2022. First type of through hole; 2023. First type of step structure; 2024. Keyway. Detailed Embodiment

[0032] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and understandable, the following detailed description of the specific embodiments of the present invention will be made in conjunction with the drawings.

[0033] As Figure 2As shown, an embodiment of the present application provides a multi-segment rotor structure of a permanent magnet synchronous motor. The structure includes a rotating shaft 204 and a plurality of iron cores 203 arranged at intervals on the rotating shaft 204. A separating component is arranged between two adjacent iron cores 203. The separating component includes a pressing block 201 and a positioning sleeve 202. The positioning sleeve 202 includes a cylindrical body portion 2021. A first type of through hole 2022 is arranged inside the cylindrical body portion 2021. The cylindrical body portion 2021 is sleeved on the rotating shaft 204 through the first type of through hole 2022. The end faces at both ends of the positioning sleeve 202 are in contact and cooperation with the end faces of the iron cores 203 on both sides. The pressing block 201 includes a main body portion. A second type of through hole 2011 is arranged on the main body portion. A weight-reducing structure is further arranged on the main body portion outside the second type of through hole 2011. The pressing block 201 is sleeved on the positioning sleeve 202 through the second type of through hole 2011. The inner wall of the second type of through hole 2011 of the pressing block 201 is in contact and cooperation with the outer surface of the positioning sleeve 202. And the ratio of the outer diameter D1 of the main body portion of the pressing block 201 to the outer diameter D2 of the iron core 203 is 0.7:1 to 1:1. The end faces at both ends of the main body portion are in contact and cooperation with the end faces of the iron cores 203 on both sides.

[0034] Specifically, the ratio of the outer diameter D1 of the main body portion of the pressing block 201 to the outer diameter D2 of the iron core 203 is 0.7:1 to 1:1. For example, the ratio of the outer diameter D1 of the main body portion of the pressing block 201 to the outer diameter D2 of the iron core 203 is 0.7:1, 0.8:1, 0.9:1, 0.95:1, 1:1, etc. That is, the outer diameter D1 of the main body portion of the pressing block 201 can be slightly smaller than the outer diameter D2 of the iron core 203 or the outer diameter D1 of the main body portion of the pressing block 201 is basically the same as the outer diameter D2 of the iron core 203.

[0035] Specifically, a preferable implementation manner is that the ratio of the outer diameter D1 of the main body portion of the pressing block 201 to the outer diameter D2 of the iron core 203 is 1:1.

[0036] During specific assembly, first install the iron core 203 on the right side on the rotating shaft 204, then assemble the pressing block 201 and the positioning sleeve 202 together, and then assemble the pressing block 201 and the positioning sleeve 202 together onto the rotating shaft 204. Then, assemble the iron core 203 on the left side onto the rotating shaft 204.

[0037] In one of the embodiments, as Figure 3 shown, the weight-reducing structure includes a plurality of third type of through holes 2012 arranged along the circumferential direction of the second type of through hole 2011. There is a rib plate 2013 structure between two adjacent third type of through holes 2012. One end of each rib plate 2013 close to the second type of through hole 2011 is connected to the first annular transition portion 2014, and one end of each rib plate 2013 far from the second type of through hole 2011 is connected to the second annular transition portion 2015.

[0038] The above weight reduction structure can effectively reduce the weight of the pressing block 201, and at the same time has high support strength.

[0039] It can be understood that the above weight reduction structure can also be other types of embodiments.

[0040] In one embodiment, as Figure 3 shown, an annular groove 2016 is provided on the outer surface of the main body portion of the pressing block 201. Both sides of the annular groove 2016 are annular convex portions 2017, and the outer diameter of the annular convex portion 2017 is the same as the outer diameter of the iron core 203.

[0041] The above structure is beneficial to reducing the deformation amount of the rotating shaft 204 on the one hand, and on the other hand, it is also convenient to disassemble the pressing block 201 from the rotating shaft 204.

[0042] In one embodiment, the main body portion of the pressing block 201 is cylindrical. The second type of through hole 2011 is provided in the center of the pressing block 201. Each of the third type of through holes 2012 is evenly distributed along the circumferential direction of the second type of through hole 2011.

[0043] In one embodiment, one end of the third type of through hole 2012 close to the second type of through hole 2011 is the small end, and one end of the third type of through hole 2012 far from the second type of through hole 2011 is the large end. The width of the small end of the third type of through hole 2012 is smaller than the width of the large end, similar to a trapezoid.

[0044] In one embodiment, as Figure 4 and Figure 5 shown, the shape of the positioning sleeve 202 is cylindrical. A key groove 2024 can also be provided on the inner wall of the first type of through hole 2022, and a key can be provided in the key groove 2024, which is beneficial to firmly fixing the positioning sleeve 202 on the rotating shaft 204.

[0045] In one embodiment, as Figure 6 shown, a first type of step structure 2023 is provided at one end of the cylindrical body portion 2021 of the positioning sleeve 202, and a second type of step structure 2023 for cooperating with the first type of step structure 2023 is provided at one end of the second type of through hole 2011 of the pressing block 201. Specifically, the above first type of step structure 2023 and the second type of step structure 2023 abut against each other.

[0046] In one embodiment, the material of the pressing block 201 is an aluminum alloy material, and the material of the positioning sleeve 202 is a steel material.

[0047] In one embodiment, the number of the iron cores 203 is 2. The two iron cores 203 are respectively located on both sides of the isolation component.

[0048] The above-described embodiments merely represent several implementation manners of the present utility model. The description thereof is relatively specific and detailed, but it should not be construed as a limitation on the scope of the utility model patent. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present utility model, several modifications and improvements can still be made, and these all fall within the protection scope of the present utility model. Therefore, the protection scope of the present utility model patent shall be subject to the appended claims.

Claims

1. A multi-section rotor structure of a permanent magnet synchronous motor, comprising a rotating shaft and a plurality of iron cores arranged at intervals on the rotating shaft, and a separating component is arranged between two adjacent iron cores, characterized in that , The separating component includes a pressing block and a positioning sleeve. The positioning sleeve includes a cylindrical body portion. A first type of through hole is provided inside the cylindrical body portion. The cylindrical body portion is sleeved on the rotating shaft through the first type of through hole. The end faces at both ends of the positioning sleeve are in contact and fit with the end faces of the iron cores on both sides. The pressing block includes a main body portion. A second type of through hole is provided in the main body portion. A weight reduction structure is further provided on the main body portion outside the second type of through hole. The pressing block is sleeved on the positioning sleeve through the second type of through hole. The inner wall of the second type of through hole of the pressing block is in contact and fit with the outer surface of the positioning sleeve. And the ratio of the outer diameter of the main body portion of the pressing block to the outer diameter of the iron core is 0.7:1 to 1:

1. The end faces at both ends of the main body portion are in contact and fit with the end faces of the iron cores on both sides.

2. The multi-segment rotor structure of the permanent magnet synchronous motor according to claim 1, wherein The weight reduction structure includes a plurality of third type of through holes arranged along the circumferential direction of the second type of through hole. There is a rib structure between two adjacent third type of through holes. One end of each rib close to the second type of through hole is connected to a first annular transition portion, and one end of each rib far from the second type of through hole is connected to a second annular transition portion.

3. The multi-segment rotor structure of the permanent magnet synchronous motor according to claim 2, wherein An annular groove is provided on the outer surface of the main body portion of the pressing block. Both sides of the annular groove are annular protrusion portions. The outer diameter of the annular protrusion portions is the same as the outer diameter of the iron core.

4. The multi-segment rotor structure of the permanent magnet synchronous motor according to claim 2, characterized in that, The main body portion of the pressing block is cylindrical.

5. The multi-segment rotor structure of the permanent magnet synchronous motor according to claim 2, characterized in that, One end of the third type of through hole close to the second type of through hole is the small end, and one end of the third type of through hole far from the second type of through hole is the large end.

6. The multi-segment rotor structure of the permanent magnet synchronous motor according to claim 1, characterized in that The shape of the positioning sleeve is cylindrical.

7. The multi-segment rotor structure of the permanent magnet synchronous motor according to claim 6, characterized in that, A first type of step structure is provided at one end of the cylindrical body portion of the positioning sleeve. A second type of step structure for cooperating with the first type of step structure is provided at one end of the second type of through hole of the pressing block.

8. The multi-segment rotor structure of the permanent magnet synchronous motor according to claim 1, characterized in that, The material of the pressing block is aluminum alloy material, and the material of the positioning sleeve is steel material.

9. The multi-section rotor structure of the permanent magnet synchronous motor according to claim 1, characterized in that, The number of the iron cores is 2.

10. The multi-segment rotor structure of the permanent magnet synchronous motor according to claim 1, characterized in that, The ratio of the outer diameter of the main body portion of the pressing block to the outer diameter of the iron core is 1:1.

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