Permanent magnet motor rotor ventilation structure and motor

Abstract

The application provides a permanent magnet motor rotor ventilation structure and a motor, and belongs to the technical field of motors. The permanent magnet motor rotor ventilation structure comprises a rotor support and permanent magnets arranged on the outer circumference of the rotor support. The application further comprises a fan blade. The fan blade is fixedly installed on the outer side wall of the rotor support in the axial direction and close to one side of the permanent magnets. The permanent magnet motor rotor ventilation structure provided by the application is installed on the outer side wall of the rotor support in the axial direction. Therefore, the fan blade rotates synchronously with the rotor support, thereby forming a cooling air flow at the rotor support. The existing air cooling method of the permanent magnet motor is to directly wrap the fan on the support shaft. Therefore, when the permanent magnet motor is assembled, the rotor support and the fan need to be sequentially installed on the support shaft in order, which leads to inconvenient disassembly and assembly. The fan blade of the application can be pre-installed on the rotor support. Then, during the assembly process, the fan blade and the rotor support can be directly installed on the support shaft as a whole, thereby improving the assembly efficiency and simplifying the structure.

Description

Technical Field

[0001] This application belongs to the field of motor technology, and more specifically, relates to a permanent magnet motor rotor ventilation structure and a motor using the permanent magnet motor rotor ventilation structure. Background Technology

[0002] The rotor of an existing permanent magnet motor generates heat during operation, and high temperature can cause demagnetization of the permanent magnets on the rotor, thus affecting the normal operation and service life of the permanent magnet motor. Therefore, heat dissipation treatment is required for the rotor. Air cooling is usually used to cool the rotor. However, the air cooling design in the existing permanent magnet motor has the problems of complex structure and low assembly efficiency. Utility Model Content

[0003] The purpose of this application is to provide a ventilation structure for the rotor of a permanent magnet motor, which aims to solve the problems of complex structure and low assembly efficiency in the existing air-cooling design of permanent magnet motors.

[0004] To achieve the above objectives, the technical solution adopted in this application is: to provide a permanent magnet motor rotor ventilation structure, including: a rotor support and a permanent magnet disposed on the outer circumference of the rotor support, characterized in that it further includes fan blades, the fan blades being fixedly installed on the outer side wall of the rotor support along the axial direction and close to the permanent magnet.

[0005] In one possible implementation, the number of fan blades is multiple, and they are evenly arranged along the circumference of the rotor support.

[0006] In one possible implementation, a magnetic pole core is provided between each two adjacent permanent magnets, and a magnetic pole pad is installed between the magnetic pole core and the rotor support.

[0007] In one possible implementation, ventilation slots are formed on the opposite sidewalls of two adjacent magnetic pole pads, and the ventilation slots penetrate the magnetic pole pads along the axial direction of the rotor support.

[0008] In one possible implementation, the ventilation slot is connected to the gap between two adjacent magnetic pole cores.

[0009] In one possible implementation, the fan blade includes a support flange and a blade; the support flange is fixed to the rotor support, the blade is fixedly connected to the support flange and arranged radially along the rotor support, and one end of the blade extends toward the side closer to the permanent magnet.

[0010] In one possible implementation, a support ring is detachably mounted on the outer axial wall of the rotor support, the support ring being coaxially arranged with the rotation axis of the rotor support, and a plurality of fan blades are mounted on the support ring.

[0011] In one possible implementation, the support ring is provided with a connector for connection to the support flange. The connector includes two elastic arms. The support flange has mounting holes corresponding to the two elastic arms. There is a space between the two elastic arms for elastic deformation. The two elastic arms are inserted into the mounting holes and abut against the inner wall of the mounting holes by their own elasticity.

[0012] In one possible implementation, the free ends of the two elastic lever arms that are opposite to each other are provided with inverted conical blocks; when the two elastic lever arms approach each other under the action of external force, the inverted conical blocks can pass through the mounting holes and abut against the top surface of the support flange.

[0013] Compared with the prior art, the solution shown in this application's embodiment provides a permanent magnet motor rotor ventilation structure. The rotor support is fixedly mounted on a support shaft, and permanent magnets are evenly distributed on the outer circumference of the rotor support. When the permanent magnet motor is powered on, the support shaft, rotor support, and permanent magnets rotate synchronously. Fan blades are installed on the outer axial wall of the rotor support, so the fan blades rotate synchronously with the rotor support, thereby forming a cooling airflow at the rotor support. Because the fan blades are close to the permanent magnets, the cooling airflow can quickly dissipate heat from the permanent magnets, thus achieving rapid cooling. Existing permanent magnet motors use a fan directly mounted on the support shaft for air cooling. Therefore, during assembly, the rotor support and fan must be installed sequentially on the support shaft, leading to inconvenience in assembly and disassembly. In contrast, the fan blades of this application can be pre-installed on the rotor support, and then during assembly, the two can be directly installed as a whole onto the support shaft, simplifying the structure and improving assembly efficiency.

[0014] Another object of this application is to provide an electric motor, which includes any of the above-described permanent magnet motor rotor ventilation structures.

[0015] Compared with the prior art, the permanent magnet motor rotor ventilation structure provided in this application has a rotor bracket fixedly mounted on a support shaft, with permanent magnets evenly distributed on the outer circumference of the rotor bracket. When the permanent magnet motor is powered on, the support shaft, rotor bracket, and permanent magnets rotate synchronously. Fan blades are installed on the outer axial wall of the rotor bracket, so the fan blades rotate synchronously with the rotor bracket, thereby forming a cooling airflow at the rotor bracket. Because the fan blades are close to the permanent magnets, the cooling airflow can quickly dissipate heat from the permanent magnets, thus achieving rapid cooling. Existing permanent magnet motors use a fan directly mounted on the support shaft for air cooling. Therefore, during assembly, the rotor bracket and fan must be installed sequentially on the support shaft, leading to inconvenience in assembly and disassembly. In contrast, the fan blades in this application can be pre-installed on the rotor bracket, and then during assembly, the two can be directly installed as a whole onto the support shaft, simplifying the structure and improving assembly efficiency. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this application, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a three-dimensional structural diagram of a permanent magnet motor rotor ventilation structure provided in an embodiment of this application;

[0018] Figure 2 A front view of a permanent magnet motor rotor ventilation structure provided in an embodiment of this application;

[0019] Figure 3 for Figure 2 Enlarged view of point A in the middle;

[0020] Figure 4 A three-dimensional structural diagram of the fan blade provided in an embodiment of this application;

[0021] Figure 5 A schematic diagram of the assembly structure of the support ring and fan blade provided in an embodiment of this application;

[0022] Figure 6 A cross-sectional view of the support ring and fan blades provided in an embodiment of this application;

[0023] Figure 7 for Figure 6 Enlarged view of point B in the middle.

[0024] In the diagram: 1. Rotor support; 101. Permanent magnet; 102. Fan blade; 103. Magnetic pole core; 104. Magnetic pole pad; 105. Ventilation slot; 106. Support flange; 107. Blade; 108. Support ring; 109. Elastic lever arm; 110. Inverted conical locking block; 111. Mounting hole; 2. Support shaft. Detailed Implementation

[0025] To make the technical problems, technical solutions, and beneficial effects to be solved by this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and are not intended to limit the scope of this application.

[0026] Please see Figure 1 The present application provides a description of a permanent magnet motor rotor ventilation structure. The permanent magnet motor rotor ventilation structure includes: a rotor support 1 and a permanent magnet 101 disposed on the outer circumference of the rotor support 1. The structure is characterized by further including a fan blade 102, which is fixedly installed on the outer axial wall of the rotor support 1 and close to the permanent magnet 101.

[0027] This embodiment provides a permanent magnet motor rotor ventilation structure. Compared with the prior art, the rotor support 1 is fixedly mounted on the support shaft 2, and the permanent magnets 101 are evenly arranged on the outer circumferential surface of the rotor support 1. When the permanent magnet motor is powered on, the support shaft 2, the rotor support 1, and the permanent magnets 101 rotate synchronously. Fan blades 102 are installed on the outer axial side wall of the rotor support 1, so the fan blades 102 will rotate synchronously with the rotor support 1, thereby forming a cooling airflow at the rotor support 1. Since the fan blades 102 are close to the permanent magnets 101, the cooling airflow can quickly dissipate heat from the permanent magnets 101, thereby achieving rapid cooling of the permanent magnets 101. The existing permanent magnet motor uses an air-cooling method in which the fan is directly mounted on the support shaft 2. Therefore, when assembling the permanent magnet motor, the rotor bracket 1 and the fan need to be installed on the support shaft 2 in sequence, which makes disassembly and assembly inconvenient. However, the fan blade 102 of this application can be pre-installed on the rotor bracket 1, and then during the assembly process, the two can be directly installed on the support shaft 2 as a whole, which simplifies the structure and improves the assembly efficiency.

[0028] In existing permanent magnet motors, the fan is directly mounted on the support shaft 2. In order to ensure the structural strength of the fan and the heat dissipation effect on the permanent magnet 101, the radius of the fan is made relatively large, thereby increasing the load on the motor. However, since the fan blade 102 of this application is directly fixed on the rotor support 1 and close to the permanent magnet 101, the fan blade 102 can be made smaller, thereby reducing the load on the motor.

[0029] In some embodiments, please refer to Figure 1 and Figure 2 Multiple fan blades 102 are evenly arranged along the circumference of the rotor support 1. In this embodiment, multiple fan blades 102 are evenly arranged along the circumference of the rotor support 1 on the outer side wall of the rotor support 1 in the axial direction. By setting multiple fan blades 102, the flow rate of the cooling airflow is accelerated, thereby improving the heat dissipation efficiency of the permanent magnet 101. Fan blades 102 are installed on both sides of the axial side wall of the rotor support 1, that is, the fan blades 102 are located on both sides of the permanent magnet 101 in the length direction. Therefore, the fan blades 102 can dissipate heat at both ends of the permanent magnet 101 in the length direction at the same time, thereby further improving the heat dissipation efficiency of the permanent magnet 101.

[0030] In some embodiments, please refer to Figure 2 and Figure 3 A magnetic pole core 103 is provided between each pair of adjacent permanent magnets 101, and a magnetic pole pad 104 is installed between the magnetic pole core 103 and the rotor support 1. In this embodiment, the magnetic pole core 103 is fixed to the rotor support 1 with screws, and the two magnetic pole cores 103 clamp and fix the permanent magnets 101. The magnetic pole pad 104 (also called a magnetic pole washer) is installed between the magnetic pole core and the rotor support 1. The magnetic pole pad 104 is used to compensate for the distance between the magnetic pole core 103 and the rotor, and at the same time to provide insulation protection for both.

[0031] In some embodiments, please refer to Figure 2 and Figure 3 Ventilation slots 105 are provided on the opposite sidewalls of two adjacent magnetic pole pads 104, and the ventilation slots 105 penetrate the magnetic pole pads 104 along the axial direction of the rotor support 1. In this embodiment, since the ventilation slots 105 penetrate the magnetic pole pads 104 along the axial direction of the rotor support 1, the cooling airflow generated by the fan blades 102 can pass through the ventilation slots 105 to dissipate heat from the permanent magnet 101.

[0032] In some embodiments, please refer to Figure 2 and Figure 3 The ventilation slot 105 is connected to the gap between the two adjacent magnetic pole cores 103. In this embodiment, a gap is left between the two adjacent magnetic pole pads 104, thereby forming an air duct between the permanent magnet 101 and the rotor support 1 (the gap between the two adjacent magnetic pole cores 103). The magnetic pole pads 104 increase the distance between the permanent magnet 101 and the rotor support 1, thereby increasing the cross-sectional area of ​​the air duct. The cooling airflow generated by the fan blades 102 passes through the air duct to dissipate heat from the permanent magnet 101. Since the ventilation slot 105 is connected to the gap between the two adjacent magnetic pole cores 103, the ventilation slot 105 can further increase the cross-sectional area of ​​the air duct, thereby allowing more airflow to enter the air duct and improving the heat dissipation effect on the permanent magnet 101.

[0033] In some embodiments, please refer to Figure 2 and Figure 3 The fan blade 102 includes a support flange 106 and a blade 107. The support flange 106 is fixed to the rotor support 1, and the blade 107 is fixedly connected to the support flange 106 and arranged radially along the rotor support 1. One end of the blade 107 extends towards the permanent magnet 101. In this embodiment, the fan blade 102 is a sheet metal part, and the support flange 106 and the blade 107 are integrally manufactured by a bending process. The support flange 106 is fitted to the outer wall of the rotor support 1, and the two are fixedly connected by screws. The blade 107 is perpendicular to the support flange 106 and arranged radially along the rotor support 1, so the blade 107 is perpendicular to the rotation direction of the rotor support 1, thereby rapidly driving the gas flow during the rotation of the rotor support 1. Since one end of the blade 107 extends towards the permanent magnet 101, it can accelerate the airflow rate near the permanent magnet 101, thereby improving the heat dissipation efficiency of the permanent magnet 101.

[0034] In some embodiments, please refer to Figure 2 , Figure 3 and Figure 5 A support ring 108 is detachably mounted on the outer side wall of the rotor support 1 along its axial direction. The support ring 108 is coaxially arranged with the rotation axis of the rotor support 1, and multiple fan blades 102 are mounted on the support ring 108. In this embodiment, the support ring 108 is fixedly mounted on the rotor support 1 with screws. The fan blades 102 located on the same side of the rotor support 1 are all mounted on the support ring 108, so the fan blades 102 and the support ring 108 can be assembled onto the rotor support 1 as a whole, thereby improving the assembly effect. The support ring 108 remains coaxial with the rotation axis of the rotor support 1, thereby ensuring the force balance of the rotor support 1.

[0035] In some embodiments, please refer to Figures 4 to 7The support ring 108 is provided with a connector for connection to the support flange 106. The connector includes two elastic arms 109. The support flange 106 has mounting holes 111 corresponding to the two elastic arms 109. A space is left between the two elastic arms 109 to allow for elastic deformation. The two elastic arms 109 are inserted into the mounting holes 111 and abut against the inner wall of the mounting holes 111 by their own elasticity. In this embodiment, the support ring 108 is provided with two connectors at each mounting position of the support flange 106. The two connectors can prevent the support flange 106 from rotating. Each connector includes two elastic arms 109. The elastic arms 109 have a certain elasticity and can produce a certain elastic deformation under the action of external force. Since there is a gap between the two elastic arms 109, the two elastic arms 109 can move closer to each other under the action of external force. The support flange 106 has mounting holes 111 corresponding to the connectors. Mounting hole 111 is a conical hole, with a smaller opening at one end near the support ring 108 and a larger opening at the other end. The side of the elastic arm 109 facing the inner wall of mounting hole 111 is in contact with the inner wall of mounting hole 111, meaning the maximum distance between the outer contours of the two elastic arms 109 gradually increases from bottom to top. The maximum distance between the outer contours of the tops of the two elastic arms 109 is greater than the maximum diameter of mounting hole 111. Therefore, before inserting the connector into mounting hole 111, a force needs to be applied to the two elastic arms 109 to reduce the distance between them, allowing them to pass through mounting hole 111 on support flange 106. After support flange 106 abuts against support ring 108, the force applied to the two elastic arms 109 is removed. The two elastic arms 109, under their own elasticity, return to their original position and abut against the inner wall of mounting hole 111, thus achieving the purpose of fixing support flange 106 to support ring 108. When it is necessary to disassemble the support flange 106, simply apply force to the two elastic levers 109 to reduce the distance between them, and the support flange 106 can be removed from the connector.

[0036] In some embodiments, please refer to Figures 4 to 7An inverted conical locking block 110 is provided at the free end of one side of the two elastic lever arms 109 that are opposite to each other. When the two elastic lever arms 109 approach each other under the action of external force, the inverted conical locking block 110 can pass through the mounting hole 111 and abut against the top surface of the support flange 106. In this embodiment, the inverted conical locking block 110 is provided at the free end of one side of the two elastic lever arms 109 that are opposite to each other. When assembling the support flange 106, the inner wall of the mounting hole 111 of the support flange 106 first contacts the inclined surface of the inverted conical locking block 110. When a force is applied to the support flange 106 toward the support ring 108, guided by the inclined surface of the inverted conical locking block 110, the support flange 106 drives the two elastic lever arms 109 to move closer to each other, and the distance between the support flange 106 and the support ring 108 gradually decreases. When the support flange 106 abuts against the support ring 108, the inverted conical locking block 110 just passes through the mounting hole 111 and contacts the top surface of the support flange 106 away from the support ring 108, thereby restricting the degree of freedom of movement of the support flange 106 and effectively preventing the support flange 106 from coming off the elastic lever arm 109.

[0037] This application also provides an electric motor, including any of the above-described permanent magnet motor rotor ventilation structures.

[0038] Compared with the prior art, the permanent magnet motor rotor ventilation structure provided in this application has a rotor support 1 fixedly mounted on a support shaft 2, and permanent magnets 101 evenly arranged on the outer circumferential surface of the rotor support 1. When the permanent magnet motor is powered on, the support shaft 2, the rotor support 1, and the permanent magnets 101 rotate synchronously. Fan blades 102 are installed on the outer axial side wall of the rotor support 1, so the fan blades 102 will rotate synchronously with the rotor support 1, thereby forming a cooling airflow at the rotor support 1. Since the fan blades 102 are close to the permanent magnets 101, the cooling airflow can quickly dissipate heat from the permanent magnets 101, thereby achieving rapid cooling of the permanent magnets 101. The existing permanent magnet motor uses an air-cooling method in which the fan is directly mounted on the support shaft 2. Therefore, when assembling the permanent magnet motor, the rotor bracket 1 and the fan need to be installed on the support shaft 2 in sequence, which makes disassembly and assembly inconvenient. However, the fan blade 102 of this application can be pre-installed on the rotor bracket 1, and then during the assembly process, the two can be directly installed on the support shaft 2 as a whole, which simplifies the structure and improves the assembly efficiency.

[0039] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A permanent magnet motor rotor ventilation structure, comprising: The rotor support and the permanent magnet disposed on the outer circumference of the rotor support are characterized in that they further include fan blades, which are fixedly installed on the outer side wall of the rotor support along the axial direction and close to the permanent magnet.

2. The permanent magnet motor rotor ventilation structure as described in claim 1, characterized in that, The number of fan blades is multiple, and they are evenly arranged along the circumference of the rotor support.

3. The permanent magnet motor rotor ventilation structure as described in claim 1, characterized in that, A magnetic pole core is provided between each pair of adjacent permanent magnets, and a magnetic pole pad is installed between the magnetic pole core and the rotor support.

4. The permanent magnet motor rotor ventilation structure as described in claim 3, characterized in that, Ventilation grooves are provided on the opposite sidewalls of two adjacent magnetic pole pads, and the ventilation grooves penetrate the magnetic pole pads along the axial direction of the rotor support.

5. The permanent magnet motor rotor ventilation structure as described in claim 4, characterized in that, The ventilation slot is connected to the gap between the two adjacent magnetic pole cores.

6. The permanent magnet motor rotor ventilation structure as described in claim 1, characterized in that, The fan blade includes a support flange and a blade; the support flange is fixed on the rotor support, the blade is fixedly connected to the support flange and arranged radially along the rotor support, and one end of the blade extends toward the side close to the permanent magnet.

7. A permanent magnet motor rotor ventilation structure as described in claim 6, characterized in that, A support ring is detachably installed on the outer side wall of the rotor support along the axial direction. The support ring is coaxially arranged with the rotation axis of the rotor support, and multiple fan blades are installed on the support ring.

8. The permanent magnet motor rotor ventilation structure as described in claim 7, characterized in that, The support ring is provided with a connector that connects to the support flange. The connector includes two elastic arms. The support flange has mounting holes corresponding to the two elastic arms. There is a space between the two elastic arms for elastic deformation. The two elastic arms are inserted into the mounting holes and abut against the inner wall of the mounting holes by their own elasticity.

9. The permanent magnet motor rotor ventilation structure as described in claim 8, characterized in that, The two elastic lever arms are provided with inverted conical locking blocks on their opposite free ends; when the two elastic lever arms approach each other under the action of external force, the inverted conical locking blocks can pass through the mounting holes and abut against the top surface of the support flange.

10. An electric motor, characterized in that, Including a permanent magnet motor rotor ventilation structure as described in any one of claims 1-9.

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