A rotor assembly and motor

Abstract

This utility model provides a rotor assembly and motor, including a rotor body, end plates at both ends of the rotor body, and multiple fixing components. The fixing components are mounted on the rotor body, and their two ends are connected to the end plates at both ends of the rotor body, fixing the end plates to the rotor body. Multiple fixing components are arranged sequentially along the circumferential direction of the rotor body, and each fixing component is arranged along the axial direction of the rotor body. Each fixing component has an oil passage on its radial side near the central axis of the rotor body, so that the oil passage is sealed when the fixing components fix the end plates, restricting the flow of cooling medium within the oil passage. The advantages of this utility model are that it replaces the rotor interference ring, reduces the volume, makes the structure more reasonable and compact, and allows for a better sealing effect on the oil passage. It ensures that the rotor cooling oil does not splash into the air gap when the motor is running at high speed, reducing mechanical losses and improving motor efficiency.

Description

Technical Field

[0001] This utility model belongs to the field of motor technology, and in particular relates to a rotor assembly and a motor. Background Technology

[0002] In a permanent magnet synchronous motor rotor assembly, the rotor core needs to cooperate with the rotor shaft to transmit torque. Dynamic balancing is performed on the rotor end plate. The rotor core and end plate are axially fixed. One end uses the shaft shoulder of the motor shaft, and the other end uses an interference ring to press the rotor core and rotor end plate together. The force point of the interference ring is the inner diameter position that mates with the shaft. If the outer diameter of the interference ring cannot cover the oil cooling circuit, gaps will be formed between the cores, and cooling oil will flow out from between the cores, increasing mechanical losses during motor operation.

[0003] The existing rotor assembly has the following defects: it is bulky, especially the axial dimension of the motor requires the addition of a rotor interference ring, which takes up space in the motor; there are gaps between the iron core laminations, and cooling oil will be thrown out from the gaps, which will increase mechanical losses when the motor is running at high speed. Summary of the Invention

[0004] In view of the above problems, the present invention provides a rotor assembly and a motor to solve the above or other problems existing in the prior art.

[0005] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is as follows: a rotor assembly, including a rotor body, end plates disposed at both ends of the rotor body, and multiple fixing components. The fixing components are disposed on the rotor body, and both ends of the fixing components are respectively connected to the end plates at both ends of the rotor body to fix the end plates to the rotor body. The multiple fixing components are arranged sequentially along the circumferential direction of the rotor body, and each fixing component is arranged along the axial direction of the rotor body. Each fixing component is provided with an oil passage on the radial side near the central axis of the rotor body so that the oil passage is sealed when the fixing components fix the end plates, thereby restricting the flow of the cooling medium in the oil passage.

[0006] Furthermore, along the radial direction of the end plate, a fixing assembly is provided on one side of the end cover oil passage on the end plate to seal the contact point between the opening end of the end cover oil passage on the end plate and the opening end of the oil passage on the rotor body.

[0007] Furthermore, along the circumferential direction of the rotor body, a fixed component is provided on both sides of each oil passage.

[0008] Furthermore, multiple fixing components located on the same radial circumference of the rotor body form a group, and at least one group of fixing components is arranged sequentially along the radial direction of the rotor body.

[0009] Furthermore, one end of the fixing component passes through an end plate, the rotor body, and another end plate in sequence, and this end of the fixing component is riveted to the corresponding end plate.

[0010] Furthermore, the fixed components are interference-fitted with the rotor body.

[0011] Furthermore, the fixing component is a rivet.

[0012] Furthermore, the rotor body includes a rotating shaft and multiple segmented rotor assemblies, each mounted on the rotating shaft. The multiple segmented rotor assemblies are arranged sequentially along the axial direction of the rotating shaft, and the segmented rotor assemblies are interference-fitted with the rotating shaft.

[0013] Furthermore, the end plate and the rotating shaft are either interference-fitted or clearance-fitted.

[0014] An electric motor, comprising the rotor assembly as described above.

[0015] By adopting the above technical solution, the multiple segmented rotor assemblies and two end plates of the rotor assembly are riveted together by fixing components, replacing the rotor interference ring, reducing the volume and making the structure more reasonable and compact. Multiple fixing components are arranged sequentially along the circumferential direction of the rotor body, and one fixing component is set on the radial outer side of any oil passage on the rotor body, or two fixing components are set on the radial outer side of any oil passage on the rotor body. The two fixing components are set on both sides of the circumferential direction of the oil passage, and the rotor body and end plates are fixed together by rivets. The fixing position is close to the oil passage position of the rotor body, so that the two adjacent segmented rotor assemblies can fit more tightly. The axial tension of the rivets can be kept consistent, so that the gap at the outer diameter position of the two adjacent segmented rotor assemblies is smaller. The position of the rivets is closer to the oil passage, so that the oil passage can get a better sealing effect. When the motor is running at high speed, it can ensure that the rotor cooling oil is not thrown into the air gap, so as to obtain a better cooling effect, thereby reducing mechanical loss and improving the efficiency of the motor. The rotor assembly has optimized structural space and makes the structural design of the rotor assembly more flexible and versatile. Attached Figure Description

[0016] Figure 1 This is a three-dimensional structural schematic diagram of a rotor assembly according to an embodiment of the present invention;

[0017] Figure 2 This is a schematic front view of a rotor assembly according to an embodiment of the present invention;

[0018] Figure 3 yes Figure 2 A schematic diagram of the AA cross-sectional structure;

[0019] Figure 4 yes Figure 2 Schematic diagram of the BB cross-section structure.

[0020] In the picture:

[0021] 1. Rotor body 2. Fixing assembly 3. End plate

[0022] 4. Shaft oil passage; 5. End cover oil passage; 6. Oil passage

[0023] 10. Segmented rotor assembly 11. Rotor shaft Detailed Implementation

[0024] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0025] Figure 1 The diagram shows a structural schematic of an embodiment of the present invention. This embodiment relates to a rotor assembly and a motor. In terms of structure, the rotor assembly fixes two end plates to both ends of the rotor body through a fixing component. The fixing component is set on the radial side of the oil passage of the rotor body, so that the segmented rotor assembly of the rotor body fits more tightly and the oil passage is better sealed. This prevents the rotor cooling medium from being thrown into the air gap during high-speed operation of the motor, thereby reducing the mechanical loss of the motor.

[0026] A rotor assembly, such as Figure 1-4 As shown, the device includes a rotor body 1, end plates 3 located at both ends of the rotor body 1, and multiple fixing components 2. The fixing components 2 are mounted on the rotor body 1, and both ends of the fixing components 2 are connected to the end plates 3 at both ends of the rotor body 1. The end plates 3 are fixedly mounted on the rotor body 1. Through the axial tension of the fixing components 2, the contact surfaces of the rotor body 1 and the end plates 3 are more tightly fitted, resulting in a smaller gap between the end faces of the rotor body 1 and the end faces of the end plates 3. The multiple fixing components 2 are arranged sequentially along the circumferential direction of the rotor body 1, fixing the rotor body 1 and the end plates 3 at both ends from different positions along the circumferential direction of the rotor body 1. This makes the contact surfaces between the end faces of the rotor body 1 at both ends and the end faces of the corresponding end plates 3 more tightly fitted, and the rotor body 1 is subjected to uniform force. By fixing the end plates 3 to both ends of the rotor body 1 through the fixing components 2, there is no need to set interference rings, reducing the volume of the rotor assembly and making the structure of the rotor assembly more compact and reasonable, thereby optimizing the structure of the motor.

[0027] When each fixing component 2 is installed, each fixing component 2 is arranged along the axial direction of the rotor body 1. That is, for any fixing component 2, one end of the fixing component 2 passes through the end plate 3, the rotor body 1 and another end plate 3 in sequence. One end of the fixing component 2 contacts one end plate 3, and the other end of the fixing component 2 contacts another end plate 3. Due to the axial tension of the fixing component 2, one end of the fixing component 2 abuts against the end plate 3 corresponding to that end, and the other end of the fixing component 2 is riveted to the end plate 3 corresponding to that end. Along the axial direction of the fixing component 2, axial force is applied to the two end plates 3 in the opposite direction. Under the action of the two axial forces, the two end plates 3 apply pressure to the rotor body 1, making the fit between the various segment rotor assemblies 10 in the rotor body 1 tighter, reducing the gap between two adjacent segment rotor assemblies 10, thereby improving the sealing performance of the oil passage 6 on the rotor body 1.

[0028] Each fixing component 2 has an oil passage 6 located on the radial side near the central axis of the rotor body 1. This improves the sealing of the oil passage 6 when the fixing component 2 fixes the end plate 3, restricting the flow of the cooling medium within the oil passage 6. In other words, when each fixing component 2 is installed on the rotor body 1, the fixing component 2 is located on the side of the oil passage 6 corresponding to it. Along the radial direction of the rotor body 1 from the inside out, the oil passage 6 and the fixing component 2 are arranged sequentially. The fixing component 2 is adjacent to the oil passage 6, and the distance between the fixing component 2 and the oil passage 6 in the radial direction of the rotor body 1 is small, thereby achieving the sealing of the oil passage 6. This allows the cooling medium to flow along the oil passage 6, ensuring that the rotor cooling medium is not thrown into the air gap during high-speed rotation of the motor, resulting in better cooling effect, reducing the mechanical loss of the motor, and improving the efficiency of the motor.

[0029] Specifically, the rotor body 1 includes a rotating shaft 11 and multiple segmented rotor assemblies 10, each mounted on the rotating shaft 11. The segmented rotor assemblies 10 are sequentially arranged along the axial direction of the rotating shaft 11, and are interference-fitted with the rotating shaft 11. Each segmented rotor assembly 10 is sequentially fixed to the rotating shaft 11, which is the output shaft of the motor. Along the axial direction of the rotating shaft 11, adjacent segmented rotor assemblies 10 are tightly fitted together, forming the main structure of the rotor assembly. Each segmented rotor assembly 10 is injection molded from a rotor core, magnets, and injection-molded plastic. Each segmented rotor assembly 10 is an independent, integral structure. Multiple segmented rotor assemblies 10 are sequentially mounted on the rotating shaft 11 to form the rotor body 1 structure. The structure of this segmented rotor assembly 10 is a conventional structure and will not be described in detail here.

[0030] The aforementioned rotating shaft 11 is a shaft structure, and the rotating shaft 11 is provided with a rotating shaft oil passage 4. The rotating shaft oil passage 4 is arranged along the axial direction of the rotating shaft 11, and the cooling medium can flow along the rotating shaft oil passage 4.

[0031] The two end plates 3 mentioned above are also fitted onto the rotating shaft 11, and the two end plates 3 are respectively located at both ends of the multiple segmented rotor assemblies 10. One end plate 3 is in contact with the outermost segmented rotor assembly 10 at one axial end of the rotor body 1, and the other end plate 3 is in contact with the outermost segmented rotor assembly 10 at the other axial end of the rotor body 1. An end cover oil passage 5 is provided on the side of the end plate 3 facing the rotor body 1. Multiple sub-oil passages are provided on each segmented rotor assembly 10, and the multiple sub-oil passages are arranged along... The segmented rotor assemblies 10 are arranged sequentially along the circumferential direction. The corresponding sub-oil passages on each segmented rotor assembly 10 are connected to form an oil passage 6. Therefore, there are multiple oil passages 6 on the rotor body 1. The multiple oil passages 6 are arranged sequentially along the circumferential direction of the rotor body 1. Any oil passage 6 on the rotor body 1 is connected to the end cover oil passage 5 on the end plate 3. At the same time, the end cover oil passage 5 on the end plate 3 is connected to the shaft oil passage 4 on the shaft 11 to realize the flow of cooling medium and achieve the cooling of the rotor.

[0032] Along the radial direction of the end plate 3, the fixing component 2 is located on one side of the end cover oil passage 5 on the end plate 3, sealing the contact point between the opening end of the end cover oil passage 5 on the end plate 3 and the opening end of the oil passage 6 on the rotor body 1. That is, when the fixing component 2 is connected to the end plate 3, it is positioned on the outside of the end cover oil passage 5 on the end plate 3 (the side away from the rotating shaft 11). The fixing component 2 will not interfere with the flow of the cooling medium in the end cover oil passage 5 on the end plate 3, nor will it interfere with the communication between the end cover oil passage 5 on the end plate 3 and the oil passage 6 on the rotor body 1. In this case, the fixing component 2 is positioned close to the oil passage 6 on the rotor body 1, resulting in a tighter fit between the end face of the end plate 3 and the end face of the rotor body 1, thus providing a better sealing effect for the oil passage 6 on the rotor assembly.

[0033] The number of the aforementioned fixing components 2 is multiple. The multiple fixing components 2 can be arranged in the following ways: along the radial direction of the rotor body 1, one fixing component 2 is set on the radial outer side of each oil passage 6 (the side of the oil passage 6 away from the rotating shaft 11), the number of fixing components 2 is consistent with the number of oil passages 6, each oil passage 6 corresponds to one fixing component 2, and each oil passage 6 and its corresponding fixing component 2 are located in the same radial direction; or, along the circumferential direction of the rotor body 1, one fixing component 2 is set on each of the two circumferential sides of each oil passage 6, that is, along the radial direction of the rotor body 1, no fixing component 2 is set on the radial outer side of each oil passage 6, but one fixing component 2 is set on the left and right sides of each oil passage 6 on the radial outer side of each oil passage 6, and the contact between the oil passage 6 and the end cover oil passage 65 is sealed from the circumferential sides of the oil passage 6.

[0034] To further optimize the scheme, the following settings are made: multiple fixing components 2 located on the same radial circumference of the rotor body 1 are grouped together, and at least one group of fixing components 2 is sequentially arranged along the radial direction of the rotor body 1. That is, along the radial direction of the rotor body 1, one group of fixing components 2 is set on the same circumference, and multiple groups of fixing components 2 are set on different circumferences. Multiple groups of fixing components 2 are sequentially arranged along the radial direction of the rotor body 1. The number of groups of fixing components 2 is selected according to actual needs, and no specific requirements are made here.

[0035] When the fixing component 2 is installed, the end plate 3 at one end of the rotor body 1 is designated as the first end plate, and the end plate 3 at the other end of the rotor body 1 is designated as the second end plate. The fixing component 2 passes through the first end plate, the rotor body 1, and the second end plate in sequence. One end of the fixing component 2 abuts against the first end plate, and the other end of the fixing component 2 is riveted to the second end plate, connecting the first end plate, the rotor body 1, and the second end plate together. The first end plate is tightened between the segmented rotor assembly 10, between the segmented rotor assemblies 10, and between the second end plate and the segmented rotor assembly 10. Axial pressure is applied to the first end plate, the rotor body 1, and the second end plate along the axial direction of the rotor body 1, so that the rotor body 1 is in close contact with the first end plate and the second end plate, forming a whole. Through the axial tension of the fixing component 2, the segmented rotor assemblies 10 in the rotor body 1 are tightly fitted together, and the gap between adjacent segmented rotor assemblies 10 is smaller.

[0036] In some feasible embodiments, preferably, the fixing component 2 is a rivet, which rivets the two end plates 3 to the rotor body 1. The rivet is a round head rivet, a semi-counterhead rivet, or a countersunk rivet, all of which are commercially available products. The choice is made according to actual needs, and no specific requirements are made here.

[0037] In some feasible embodiments, the aforementioned fixing component 2 is interference-fitted with the rotor body 1, and the end plate 3 is interference-fitted or clearance-fitted with the rotating shaft 11.

[0038] An electric motor, comprising the rotor assembly as described above.

[0039] In use, one end plate 3 is fitted onto the rotating shaft 11. The shoulder on the rotating shaft 11 provides axial positioning of the end plate 3. Then, multiple segmented rotor assemblies 10 are mounted on the rotating shaft 11, each segmented rotor assembly 10 having an interference fit with the rotating shaft 11. Next, another end plate 3 is fitted onto the rotating shaft 11. Finally, multiple fixing components 2 secure the two end plates 3 to both ends of the rotor assembly 1. The oil passages 6 on the rotor body 1 are connected to the end cover oil passages 5 on the end plate 3. The end cover oil passages 5 on the end plate 3 are connected to the rotating shaft oil passages 4 on the rotating shaft 11, allowing the cooling medium to flow through the oil passages 6, 5, and 4, thus cooling the rotor assembly.

[0040] By adopting the above technical solution, the multiple segmented rotor assemblies and two end plates of the rotor assembly are riveted together by fixing components, replacing the rotor interference ring, reducing the volume and making the structure more reasonable and compact. Multiple fixing components are arranged sequentially along the circumferential direction of the rotor body, and one fixing component is set on the radial outer side of any oil passage on the rotor body, or two fixing components are set on the radial outer side of any oil passage on the rotor body. The two fixing components are set on both sides of the circumferential direction of the oil passage, and the rotor body and end plates are fixed together by rivets. The fixing position is close to the oil passage position of the rotor body, so that the two adjacent segmented rotor assemblies can fit more tightly. The axial tension of the rivets can be kept consistent, so that the gap at the outer diameter position of the two adjacent segmented rotor assemblies is smaller. The position of the rivets is closer to the oil passage, so that the oil passage can get a better sealing effect. When the motor is running at high speed, it can ensure that the rotor cooling oil is not thrown into the air gap, so as to obtain a better cooling effect, thereby reducing mechanical loss and improving the efficiency of the motor. The rotor assembly has optimized structural space and makes the structural design of the rotor assembly more flexible and versatile.

[0041] The embodiments of this utility model have been described in detail above, but the content described is only a preferred embodiment of this utility model and should not be considered as limiting the scope of implementation of this utility model. All equivalent changes and improvements made in accordance with the claims of this utility model should still fall within the patent coverage of this utility model.

Claims

1. A rotor assembly, characterized in that: The device includes a rotor body, end plates at both ends of the rotor body, and multiple fixing components. The fixing components are disposed on the rotor body, and both ends of the fixing components are connected to the end plates at both ends of the rotor body to fix the end plates to the rotor body. The multiple fixing components are arranged sequentially along the circumferential direction of the rotor body, and each fixing component is arranged along the axial direction of the rotor body. Each fixing component has an oil passage on the radial side near the central axis of the rotor body so that the oil passage is sealed when the fixing components fix the end plates, thus restricting the flow of cooling medium in the oil passage.

2. The rotor assembly according to claim 1, characterized in that: Along the radial direction of the end plate, the fixing assembly is disposed on one side of the end cover oil passage on the end plate to seal the contact point between the opening end of the end cover oil passage on the end plate and the opening end of the oil passage on the rotor body.

3. The rotor assembly according to claim 2, characterized in that: Along the circumferential direction of the rotor body, a fixing component is provided on each of the two sides of the circumferential direction of each oil passage.

4. The rotor assembly according to claim 3, characterized in that: A plurality of fixing components located on the same radial circumference of the rotor body constitute a group, and at least one group of fixing components is arranged sequentially along the radial direction of the rotor body.

5. The rotor assembly according to any one of claims 1-4, characterized in that: One end of the fixing component passes through one end plate, the rotor body, and another end plate in sequence, and this end of the fixing component is riveted to the corresponding end plate.

6. The rotor assembly according to claim 5, characterized in that: The fixing component is interference-fitted with the rotor body.

7. The rotor assembly according to claim 6, characterized in that: The fixing component is a rivet.

8. The rotor assembly according to any one of claims 1-4 and 6-7, characterized in that: The rotor body includes a rotating shaft and multiple segmented rotor assemblies, each mounted on the rotating shaft. The multiple segmented rotor assemblies are arranged sequentially along the axial direction of the rotating shaft, and the segmented rotor assemblies are interference-fitted with the rotating shaft.

9. The rotor assembly according to claim 8, characterized in that: The end plate is either interference-fitted or clearance-fitted with the rotating shaft.

10. An electric motor, characterized in that: Includes the rotor assembly as described in any one of claims 1-9.

Images