Rotor compensation structure renovated into permanent magnet motor based on three-phase asynchronous motor

Abstract

The utility model provides a rotor compensation structure based on renovating a three-phase asynchronous motor into a permanent magnet motor, which belongs to the technical field of motor renovation, and comprises a support vertical plate, a shielding sleeve, a spacing ring, a positioning sleeve and a heat dissipation assembly, the support vertical plate is matched with the inner wall of a shell and is provided with a mounting hole; the shielding sleeve is fixedly installed at one end of the supporting vertical plate and matched with the inner wall of the shell. An annular flange is arranged on the shielding sleeve. The limiting ring is fixedly mounted on one side of the supporting vertical plate and arranged around the mounting hole, and the positioning sleeve is fixedly mounted at the other end of the supporting vertical plate and arranged in the length direction of the shell; the positioning sleeve is matched with the inner wall of the shell; the distance between the positioning sleeve and the shielding sleeve is consistent with the length of the shell; the heat dissipation assembly is installed in the positioning sleeve. According to the rotor compensation structure renovated into the permanent magnet motor based on the three-phase asynchronous motor provided by the utility model, the renovated stator and the shell form good matching installation, and the heat dissipation performance is relatively high.

Description

Technical Field

[0001] This utility model belongs to the field of motor retrofitting technology, and more specifically, it relates to a rotor compensation structure for retrofitting a three-phase asynchronous motor into a permanent magnet motor. Background Technology

[0002] Permanent magnet motors generate their magnetic field using permanent magnets, eliminating the need for excitation coils and excitation current. This results in higher efficiency and power factor, while reducing energy consumption and operating costs in production. Furthermore, permanent magnet motors are simple in structure, highly reliable, and less demanding in terms of environment, operating in harsh conditions such as high and low temperatures, humidity, and dust. This makes them widely applicable across various industries and fields. Therefore, refurbishing three-phase asynchronous motors into permanent magnet motors has significant development potential. However, due to the smaller size of permanent magnet motors, when using the casing of a three-phase asynchronous motor, the stator inside the permanent magnet motor cannot be properly fitted along its length, and the stator slots on the inner wall of the casing cannot match the stator, leading to insufficient stator installation stability. Additionally, the refurbishment process often results in poor heat dissipation performance for permanent magnet motors. Utility Model Content

[0003] The purpose of this utility model is to provide a rotor compensation structure for converting a three-phase asynchronous motor into a permanent magnet motor, so as to solve the technical problems in the prior art where the stator of the permanent magnet motor cannot be installed in the housing and the heat dissipation performance is poor.

[0004] To achieve the above objectives, the technical solution adopted by this utility model is as follows: A rotor compensation structure for converting a three-phase asynchronous motor into a permanent magnet motor is provided, comprising a support vertical plate, a shielding sleeve, a limiting ring, a positioning sleeve, and a heat dissipation assembly for installation inside a housing. The support vertical plate is fitted with the inner wall of the housing and has mounting holes for rotatable connection with the rotating shaft. The shielding sleeve is fixedly installed at one end of the support vertical plate and arranged along the length of the housing. The shielding sleeve is fitted with the inner wall of the housing and is used to shield the stator slots on the inner wall of the housing. The shielding sleeve has an annular flange for limiting the stator installation position; the limiting ring is fixedly installed on the side of the support vertical plate near the stator and arranged around the mounting hole, and the limiting ring is used to abut against one end of the stator; the positioning sleeve is fixedly installed on the other end of the support vertical plate and arranged along the length direction of the outer shell; the positioning sleeve is fitted with the inner wall of the outer shell; the distance between the opposite ends of the positioning sleeve and the shielding sleeve is consistent with the length of the outer shell; the heat dissipation assembly is installed inside the positioning sleeve to reduce the temperature inside the outer shell.

[0005] In one possible implementation, an annular positioning groove is further provided on the inner wall of the outer casing, and the supporting vertical plate and the positioning sleeve are fitted into the annular positioning groove. Half of the difference between the outer diameters of the supporting vertical plate and the shielding sleeve is equal to the depth of the annular positioning groove.

[0006] In one possible implementation, the end of the positioning sleeve is provided with a retaining ring for mounting to the end of the housing, and the retaining ring is provided with a plurality of connecting holes.

[0007] In one possible implementation, an extension cylinder is fixed to the side of the support vertical plate away from the limiting ring. The extension cylinder is coaxially arranged with the mounting hole, and its inner diameter is the same as that of the mounting hole.

[0008] In one possible implementation, the end of the positioning sleeve is provided with a fixing ring for mounting to the end of the outer shell, and the fixing ring is provided with multiple connecting holes; the fixing ring is provided with a liquid inlet hole and a liquid return hole arranged radially; the heat dissipation assembly includes multiple heat dissipation fins and cooling pipes located inside the positioning sleeve, and the multiple heat dissipation fins are fixedly installed on the side of the support vertical plate away from the limiting ring; the two ends of the cooling pipe are respectively connected to the liquid inlet hole and the liquid return hole.

[0009] In one possible implementation, the cooling pipes are arranged in a reciprocating, meandering manner, with the end of the heat dissipation fins away from the supporting vertical plate extending into the gaps of the cooling pipes.

[0010] In one possible implementation, the inner wall of the positioning sleeve is provided with an upper support assembly and a lower support assembly, and each of the upper support assembly and the lower support assembly has a first support cavity for supporting the cooling pipe.

[0011] In one possible implementation, both the liquid inlet and the liquid return are located on the upper side of the fixing ring, and the support member on the upper support assembly is also provided with a second support cavity located above the first support cavity; the end section of the cooling pipe is supported in the second support cavity.

[0012] In one possible implementation, a sealing ring for radial sealing is provided in the mounting hole, and a sealing ring for axial sealing is provided on the retaining ring.

[0013] In one possible implementation, the supporting vertical plate, the shielding sleeve, the limiting ring, the positioning sleeve, and the annular flange are integrally formed.

[0014] The beneficial effects of the rotor compensation structure for converting a three-phase asynchronous motor into a permanent magnet motor provided by this utility model are as follows: Compared with the prior art, during installation, the supporting vertical plate, shielding sleeve, and positioning sleeve are inserted into the interior of the outer shell from one end. The shielding sleeve is installed in conjunction with the inner wall of the outer shell, thereby shielding the stator slots on the inner wall of the outer shell and effectively preventing the stator of the permanent magnet motor from being interfered with by the stator slots on the outer shell. The stator and rotor of the permanent magnet motor are installed inside the shielding sleeve. Under the action of the annular flange and the limiting ring, the stator and rotor are installed in the shielding sleeve without being affected by the length of the outer shell, and the installation is stable and reliable. Since the sum of the lengths of the positioning sleeve, shielding sleeve, and supporting vertical plate is the same as the length of the outer shell, after installing end caps at both ends of the outer shell, the end caps are used to limit the entire compensation structure, ensuring that the compensation structure is securely installed. A heat dissipation component is installed in the positioning sleeve. The heat generated by the permanent magnet motor during operation exchanges heat with the heat dissipation component, thereby reducing the temperature inside the permanent magnet motor and improving the heat dissipation performance of the refurbished permanent magnet motor. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of this utility model, 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 utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 A schematic diagram of the internal structure of the refurbished permanent magnet motor provided in this embodiment of the utility model;

[0017] Figure 2 A partial schematic diagram of the rotor compensation structure for converting a three-phase asynchronous motor into a permanent magnet motor, provided in an embodiment of this utility model;

[0018] Figure 3 A top view of the rotor compensation structure for converting a three-phase asynchronous motor into a permanent magnet motor, provided in an embodiment of this utility model.

[0019] Figure 4 A schematic diagram showing the connection between the supporting vertical plate, the shielding sleeve, the limiting ring, the positioning sleeve, and the outer shell provided in an embodiment of this utility model;

[0020] Figure 5 This is a schematic diagram of the structure of the support member provided in an embodiment of the present utility model.

[0021] The following are the labeling elements in the figure:

[0022] 10. Support plate; 11. Mounting hole; 12. Extension sleeve; 20. Shielding sleeve; 21. Annular flange; 30. Limiting ring; 40. Positioning sleeve; 41. Fixing ring; 42. Connecting hole; 43. Liquid inlet hole; 44. Liquid return hole; 45. Support component; 46. First support cavity; 47. Second support cavity; 50. Heat dissipation assembly; 51. Heat dissipation fins; 52. Cooling pipe; 60. Annular positioning groove; 70. Housing; 71. Stator; 72. Rotor; 73. Shaft; 74. End cover; 75. Bearing. Detailed Implementation

[0023] To make the technical problems, technical solutions, and beneficial effects of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0024] It should be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on or indirectly on that other component. When a component is referred to as being "connected to" another component, it can be directly connected to or indirectly connected to that other component.

[0025] It should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0026] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0027] Please see Figures 1 to 4The present invention describes a rotor compensation structure for converting a three-phase asynchronous motor into a permanent magnet motor. The rotor compensation structure includes a support vertical plate 10, a shielding sleeve 20, a limiting ring 30, a positioning sleeve 40, and a heat dissipation assembly 50, all for installation inside a housing 70. The support vertical plate 10 is fitted to the inner wall of the housing 70 and has mounting holes 11 for rotatably connecting with a rotating shaft 73. The shielding sleeve 20 is fixedly installed at one end of the support vertical plate 10 and is arranged along the length of the housing 70. The shielding sleeve 20 is fitted to the inner wall of the housing 70 and is used to shield the stator 71 groove on the inner wall of the housing 70. An annular flange 21 is provided to limit the installation position of the stator 71; a limiting ring 30 is fixedly installed on the side of the support vertical plate 10 near the stator 71 and arranged around the mounting hole 11, and the limiting ring 30 is used to abut against one end of the stator 71; a positioning sleeve 40 is fixedly installed on the other end of the support vertical plate 10 and arranged along the length direction of the outer shell 70; the positioning sleeve 40 is fitted with the inner wall of the outer shell 70; the distance between the opposite ends of the positioning sleeve 40 and the shielding sleeve 20 is the same as the length of the outer shell 70; a heat dissipation assembly 50 is installed inside the positioning sleeve 40 to reduce the temperature inside the outer shell 70.

[0028] The rotor compensation structure for converting a three-phase asynchronous motor into a permanent magnet motor provided by this utility model, compared with the prior art, allows for the following advantages during installation: the supporting vertical plate 10, the shielding sleeve 20, and the positioning sleeve 40 are inserted into the interior of the outer shell 70 from one end. The shielding sleeve 20 is fitted with the inner wall of the outer shell 70, thereby shielding the stator 71 slot on the inner wall of the outer shell 70 and effectively preventing the stator 71 of the permanent magnet motor from being interfered with by the stator 71 slot on the outer shell 70. The stator 71 and rotor 72 of the permanent magnet motor are installed inside the shielding sleeve 20. Under the action of the annular flange 21 and the limiting ring 30, the stator 71 and rotor 72 are fitted and installed in the shielding sleeve 20 without being affected by the length of the outer shell 70, and the installation is stable and reliable. Since the sum of the lengths of the positioning sleeve 40, the shielding sleeve 20, and the supporting vertical plate 10 is the same as the length of the outer casing 70, after installing end caps 74 at both ends of the outer casing 70, the entire compensation structure is limited by the end caps 74 to ensure that the compensation structure is securely installed. A heat dissipation component 50 is installed in the positioning sleeve 40. The heat generated by the permanent magnet motor during operation exchanges heat with the heat dissipation component 50, thereby reducing the temperature inside the permanent magnet motor and improving the heat dissipation performance of the refurbished permanent magnet motor.

[0029] Reinforcing ribs are provided at the connection points of the positioning sleeve 40, the shielding sleeve 20, and the supporting vertical plate 10. The reinforcing ribs are distributed in a triangular pattern, which can effectively enhance the connection strength between the positioning sleeve 40, the shielding sleeve 20, and the supporting vertical plate 10, and improve the stability of the entire rotor 72 compensation structure. Bearings 75 are installed at both ends of the outer casing 70 to ensure that the rotor 72 operates smoothly and efficiently.

[0030] Please see Figures 1 to 4 As a specific embodiment of the rotor compensation structure for converting a three-phase asynchronous motor into a permanent magnet motor provided by this utility model, it also includes an annular positioning groove 60 opened on the inner wall of the outer shell 70. The supporting vertical plate 10 and the positioning sleeve 40 are installed in the annular positioning groove 60. Half of the difference between the outer diameters of the supporting vertical plate 10 and the shielding sleeve 20 is equal to the depth of the annular positioning groove 60. An annular positioning groove 60 of a certain length is pre-opened on the inner wall of one end of the outer shell 70, and the supporting vertical plate 10 and the positioning sleeve 40 are installed in conjunction with the annular positioning groove 60. When installing the entire compensation structure, the shielding sleeve 20 is installed into the outer shell 70 from one end, thereby making one end of the supporting vertical plate 10 align with the annular positioning groove 60 to achieve positioning installation. The operation is quick and accurate.

[0031] Please see Figures 1 to 4 As a specific embodiment of the rotor compensation structure for converting a three-phase asynchronous motor into a permanent magnet motor provided by this utility model, the end of the positioning sleeve 40 is provided with a fixing ring 41 for installation with the end of the housing 70, and the fixing ring 41 is provided with multiple connecting holes 42; a stepped structure is formed between the fixing ring 41 and the positioning sleeve 40, and the outer diameter of the fixing ring 41 is larger than the outer diameter of the positioning sleeve 40. Therefore, when the entire compensation structure is installed into the housing 70, the fixing ring 41 mates with the end of the housing 70, thereby making the installation of the compensation structure accurate and quick. Then, a suitable bolt is used to pass through the connecting holes 42 and the end cap 74 and screw it into the corresponding threaded hole at the end of the housing 70, thereby firmly installing the positioning sleeve 40 on the housing 70.

[0032] Please see Figure 1 , Figure 2 and Figure 4 As a specific embodiment of the rotor compensation structure for converting a three-phase asynchronous motor into a permanent magnet motor provided by this utility model, an extension cylinder 12 is fixedly provided on the side of the supporting vertical plate 10 away from the limiting ring 30. The extension cylinder 12 is coaxially arranged with the mounting hole 11, and its inner diameter is consistent with the inner diameter of the mounting hole 11. The extension cylinder 12 increases the mating connection length between the supporting vertical plate 10 and the rotating shaft 73, making the installation of the rotating shaft 73 more stable and reliable. Preferably, multiple sealing rings are installed inside the extension cylinder 12 to improve the sealing performance of the connection between the rotating shaft 73 and the supporting vertical plate 10.

[0033] Please see Figure 1 and Figure 2As a specific embodiment of the rotor compensation structure based on the refurbishment of a three-phase asynchronous motor into a permanent magnet motor provided by this utility model, the end of the positioning sleeve 40 is provided with a fixing ring 41 for installation in conjunction with the end of the outer shell 70, and the fixing ring 41 is provided with a plurality of connecting holes 42; the fixing ring 41 is provided with a liquid inlet hole 43 and a liquid return hole 44 arranged radially; the heat dissipation assembly 50 includes a plurality of heat dissipation fins 51 and a cooling pipe 52 located inside the positioning sleeve 40, and the plurality of heat dissipation fins 51 are fixedly installed on the side of the support vertical plate 10 away from the limiting ring 30; the two ends of the cooling pipe 52 are respectively connected to the liquid inlet hole 43 and the liquid return hole 44; a stepped structure is formed between the fixing ring 41 and the positioning sleeve 40, and the outer diameter of the fixing ring 41 is larger than the outer diameter of the positioning sleeve 40. During installation, the fixing ring 41 is mated to the end of the outer shell 70, and the fixing ring 41 and the end cap 74 are fixedly connected to the outer shell 70 by means of the connecting holes 42. Meanwhile, a liquid inlet hole 43 and a liquid return hole 44 are provided on the fixing ring 41, and the liquid inlet hole 43 and the liquid return hole 44 penetrate the fixing ring 41. The heat dissipation assembly 50 includes two parts: heat dissipation fins 51 and cooling pipes 52; multiple heat dissipation fins 51 are fixedly installed on the supporting vertical plate 10, and the cooling pipes 52 are located inside the positioning sleeve 40, with both ends of the cooling pipes 52 connected to the liquid inlet hole 43 and the liquid return hole 44. During operation, the low-temperature medium flows into the cooling pipes 52 from the liquid inlet hole 43, absorbs the heat transferred from the heat dissipation fins 51 during the flow in the pipe, and then flows out from the liquid return hole 44, forming a circulating heat dissipation system. In order to ensure the normal circulation of coolant, a temperature sensor is also provided on the inner wall of the positioning sleeve 40. The temperature sensor is electrically connected to the external control system. When the temperature inside the positioning sleeve 40 is detected to be too high, the control system will adjust the operating parameters of the coolant circulation device to accelerate the flow rate of coolant and enhance the heat dissipation effect. The heat dissipation fins 51 are made of a copper alloy with high thermal conductivity, which can quickly conduct heat from the outer casing 70 to the positioning sleeve 40, and then cool it down through the cooling pipe 52.

[0034] Please see Figure 1 As a specific embodiment of the rotor compensation structure for converting a three-phase asynchronous motor into a permanent magnet motor provided by this utility model, the cooling pipe 52 is arranged in a reciprocating tortuous manner, and the end of the heat dissipation fins 51 away from the supporting vertical plate 10 extends into the gap of the cooling pipe 52. The reciprocating tortuous arrangement of the cooling pipe 52 forms a compact and efficient cooling structure, allowing the coolant to fully exchange heat with the surrounding air when flowing in the pipe. The end of the heat dissipation fins 51 away from the supporting vertical plate 10 extending into the gap of the cooling pipe 52 greatly increases the heat dissipation area. As the coolant continuously circulates in the pipe, it absorbs and carries away the heat generated by the motor.

[0035] Please see Figure 1 and Figure 5As a specific embodiment of the rotor compensation structure for converting a three-phase asynchronous motor into a permanent magnet motor provided by this utility model, the inner wall of the positioning sleeve 40 is provided with an upper support assembly and a lower support assembly. Each support member 45 of the upper and lower support assemblies is provided with a first support cavity 46 for supporting the cooling pipe 52. That is, when the cooling pipe 52 is arranged in a reciprocating and meandering manner inside the positioning sleeve 40, its upper part is provided on multiple support members 45 in the upper support assembly, while its lower part is provided on multiple support members 45 in the lower support assembly. The upper and lower support assemblies on the inner wall of the positioning sleeve 40 provide support and limit for the cooling pipe 52, ensuring the stable and effective use of the cooling pipe 52. Specifically, the support member 45 is provided with a first support cavity 46, and the cooling pipe 52 is installed in the first support cavity 46 to ensure the stable and reliable operation of the cooling pipe 52. The supports 45 in the upper and lower support groups are evenly spaced, providing stable and uniform support for the cooling pipe 52 within the positioning sleeve 40. The shape of the first support cavity 46 is adapted to the outer wall contour of the cooling pipe 52, allowing it to fit tightly against the cooling pipe 52 and reducing the swaying of the cooling pipe 52 within the positioning sleeve 40.

[0036] Please see Figure 1 and Figure 5 As a specific embodiment of the rotor compensation structure for converting a three-phase asynchronous motor into a permanent magnet motor provided by this utility model, the liquid inlet 43 and the liquid return 44 are both opened on the upper side of the fixing ring 41. The support member 45 on the upper support member group is also provided with a second support cavity 47 located above the first support cavity 46. The end section of the cooling pipe 52 is supported in the second support cavity 47. In order to facilitate the addition and return of the low-temperature medium to the cooling pipe 52, the liquid inlet 43 and the liquid return 44 are opened on the fixing ring 41, and the liquid inlet 43 and the liquid return 44 are connected to the inside of the positioning sleeve 40 after passing through the fixing ring 41. The inlet of the cooling pipe 52 located in the positioning sleeve 40 is connected to the liquid inlet 43, and the cooling pipe 52 itself is arranged back and forth inside the positioning sleeve 40. The outlet section of the cooling pipe 52 passes through the second support cavity 47 of the multiple support members 45 in the upper support member group, so that the outlet of the cooling pipe 52 can be smoothly connected to the liquid return 44. In this way, the entry and exit of the cryogenic medium will not affect or interfere with the motor housing 70. Preferably, the two ends of the cooling pipe 52 are respectively inserted into the liquid inlet hole 43 and the liquid return hole 44, and connectors are installed at both ends of the cooling pipe 52.

[0037] Please see Figure 1As a specific embodiment of the rotor compensation structure for converting a three-phase asynchronous motor into a permanent magnet motor provided by this utility model, a sealing ring for radial sealing is provided in the mounting hole 11, and a sealing ring for axial sealing is provided on the fixing ring 41. These two sealing rings cooperate to form an all-round sealing system, effectively preventing the leakage of liquid or gas and creating a well-sealed space inside the positioning sleeve 40. The sealing ring is provided on the inner wall of the mounting hole 11 to form a good sealing connection between the shielding sleeve 20 and the positioning sleeve 40, while the sealing ring is provided on the fixing ring 41 to form a good sealing connection between the inside of the positioning sleeve 40 and the external environment.

[0038] Please see Figures 1 to 4 As a specific embodiment of the rotor compensation structure for converting a three-phase asynchronous motor into a permanent magnet motor provided by this utility model, the supporting vertical plate 10, the shielding sleeve 20, the limiting ring 30, the positioning sleeve 40, and the annular flange 21 are integrally formed. This integral forming design makes the structure more stable and reduces the loosening and gaps that may occur due to the assembly of multiple parts. The integrally formed structure can better withstand various external forces and vibrations, ensuring stability and reliability. At the same time, the integral forming process also improves production efficiency, reduces production costs, and avoids the cumbersome procedures and additional costs caused by processing and assembling multiple parts separately.

[0039] The above are merely preferred embodiments of the present utility model and are not intended to limit the present utility model. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A rotor compensation structure for converting a three-phase asynchronous motor into a permanent magnet motor, characterized in that, The device includes a support vertical plate, a shielding sleeve, a limiting ring, a positioning sleeve, and a heat dissipation assembly for installation inside a housing. The support vertical plate is fitted to the inner wall of the housing and has a mounting hole for rotatable connection with a rotating shaft. The shielding sleeve is fixedly installed at one end of the support vertical plate and is arranged along the length of the housing. The shielding sleeve is fitted to the inner wall of the housing and is used to shield the stator slot on the inner wall of the housing. The shielding sleeve has an annular flange for limiting the installation position of the stator. The limiting ring is fixedly installed on the side of the support vertical plate near the stator and is arranged around the mounting hole. The limiting ring is used to abut against one end of the stator. The positioning sleeve is fixedly installed at the other end of the support vertical plate and is arranged along the length of the housing. The positioning sleeve is fitted to the inner wall of the housing. The distance between the opposite ends of the positioning sleeve and the shielding sleeve is the same as the length of the housing. The heat dissipation assembly is installed inside the positioning sleeve to reduce the temperature inside the housing.

2. The rotor compensation structure for converting a three-phase asynchronous motor into a permanent magnet motor as described in claim 1, characterized in that, It also includes an annular positioning groove formed on the inner wall of the outer shell, in which the supporting vertical plate and the positioning sleeve are fitted together and installed. Half of the difference between the outer diameter of the supporting vertical plate and the shielding sleeve is equal to the depth of the annular positioning groove.

3. The rotor compensation structure for converting a three-phase asynchronous motor into a permanent magnet motor as described in claim 2, characterized in that, The end of the positioning sleeve is provided with a fixing ring for installation with the end of the outer shell, and the fixing ring is provided with multiple connecting holes.

4. The rotor compensation structure for converting a three-phase asynchronous motor into a permanent magnet motor as described in claim 1, characterized in that, An extension cylinder is fixed on the side of the support vertical plate away from the limiting ring. The extension cylinder is coaxially arranged with the mounting hole, and its inner diameter is the same as that of the mounting hole.

5. The rotor compensation structure for converting a three-phase asynchronous motor into a permanent magnet motor as described in claim 1, characterized in that, The end of the positioning sleeve is provided with a fixing ring for installation with the end of the outer shell, and the fixing ring is provided with multiple connecting holes; the fixing ring is provided with a liquid inlet hole and a liquid return hole arranged radially; the heat dissipation assembly includes multiple heat dissipation fins and cooling pipes located inside the positioning sleeve, and the multiple heat dissipation fins are fixedly installed on the side of the support vertical plate away from the limiting ring; the two ends of the cooling pipe are respectively connected to the liquid inlet hole and the liquid return hole.

6. The rotor compensation structure for converting a three-phase asynchronous motor into a permanent magnet motor as described in claim 5, characterized in that, The cooling pipes are arranged in a reciprocating and meandering manner, and the end of the heat dissipation fins away from the supporting vertical plate extends into the gap of the cooling pipes.

7. The rotor compensation structure for converting a three-phase asynchronous motor into a permanent magnet motor as described in claim 5, characterized in that, The inner wall of the positioning sleeve is provided with an upper support assembly and a lower support assembly, and each of the upper support assembly and the lower support assembly is provided with a first support cavity for supporting the cooling pipe.

8. The rotor compensation structure for converting a three-phase asynchronous motor into a permanent magnet motor as described in claim 7, characterized in that, Both the liquid inlet and the liquid return hole are located on the upper side of the fixing ring. The support member on the upper support member assembly is also provided with a second support cavity located above the first support cavity. The end section of the cooling pipe is supported in the second support cavity.

9. The rotor compensation structure for converting a three-phase asynchronous motor into a permanent magnet motor as described in claim 5, characterized in that, The mounting hole is provided with a sealing ring for radial sealing, and the fixing ring is provided with a sealing ring for axial sealing.

10. The rotor compensation structure for converting a three-phase asynchronous motor into a permanent magnet motor as described in claim 1, characterized in that, The supporting vertical plate, the shielding sleeve, the limiting ring, the positioning sleeve, and the annular flange are integrally formed.

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