Permanent magnetization regeneration method for waste motor of copper alloy wire processing equipment

Abstract

The invention belongs to the technical field of permanent magnetization remanufacturing, and particularly relates to a permanent magnetization regeneration method for a waste motor of copper alloy wire processing equipment, and the method comprises the steps: disassembling a waste asynchronous motor, and reserving a case, a stator, a rotor core and a rotating shaft which are not damaged; the specifications of the air injection channels are determined according to the diameter of the rotating shaft, more than two air injection channels are arranged on the rotating shaft at equal-angle intervals, and then the rotating shaft is installed in the machine shell; the rotor core is split to obtain steel sheets, and permanent magnet grooves, magnetic isolation air grooves and air injection channel grooves are formed in the steel sheets; the permanent magnets are assembled in the permanent magnet grooves, then the steel sheets are laminated according to a first rule to obtain a rotor, and then the rotor is assembled to the rotating shaft; a rear end cover of the machine shell is removed, a heat dissipation machine cover is manufactured according to the diameter of the rear end cover, a bearing groove and an air outlet hole are formed in the heat dissipation machine cover, and then the heat dissipation machine cover is assembled to the machine shell; and a frequency converter is additionally arranged on the shell. The remanufactured permanent magnet synchronous motor manufactured by the method has better sealing performance and heat dissipation performance.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of permanent magnetization remanufacturing, and particularly relates to a permanent magnetization regeneration method for a waste motor of a copper alloy wire processing device. BACKGROUND

[0002] Permanent magnetization remanufacturing technology is a technology for transforming an old motor into a high-efficiency permanent magnet motor, and has the advantages of energy saving, environmental protection and resource recycling. Three-phase asynchronous motors are widely assembled in existing copper alloy wire processing devices because of their cheapness and reliability, but the difficulty in speed change of the three-phase asynchronous motor also makes it unable to process high-precision copper alloy wires. At this time, the permanent magnetization remanufacturing technology can be used to transform the waste three-phase asynchronous motor into a permanent magnet synchronous motor with accurate and fast speed change, and upgrade the low-precision copper alloy wire processing device into a copper alloy wire processing device that can process high-precision copper alloy wires, which not only recycles resources, but also does not need to make major changes to the industrial chain.

[0003] In the existing permanent magnetization remanufacturing technology, the processing environment of the copper alloy wire is not considered. In the processing environment of the copper alloy wire, a large amount of copper alloy powder will be generated in the copper wire drawing process, and the copper alloy may be copper-nickel alloy, which will be attracted by the permanent magnet. If the sealing performance of the motor is not enough, the copper alloy powder will be attracted into the motor, thereby increasing the motor failure rate. In addition, online annealing of the copper alloy wire will cause the processing environment temperature to be relatively high, and therefore the heat dissipation performance of the motor needs to be improved, otherwise the high working temperature will cause the aging speed of the permanent magnet motor to increase. Therefore, the remanufactured permanent magnet synchronous motor transformed by the existing permanent magnetization remanufacturing technology has the problems of insufficient sealing performance and heat dissipation performance when used in the copper alloy wire processing device. SUMMARY

[0004] The embodiment of the application provides a permanent magnetization regeneration method for a waste motor of a copper alloy wire processing device, which can solve the problems of insufficient sealing performance and heat dissipation performance of the remanufactured permanent magnet synchronous motor transformed by the existing permanent magnetization remanufacturing technology.

[0005] In a first aspect, the embodiment of the application provides a permanent magnetization regeneration method for a waste motor of a copper alloy wire processing device. The waste motor is a waste asynchronous motor, and the waste asynchronous motor includes a motor shell, a stator, a rotor core, a rotor winding and a rotating shaft. The method includes: Disassembling the waste asynchronous motor, retaining the undamaged motor shell, stator, rotor core and rotating shaft, and cleaning the retained parts, and then installing the stator into the motor shell; wherein the rotor winding is discarded; The specifications of the air injection channel are determined according to the diameter of the rotating shaft, and two or more air injection channels are arranged at equiangular intervals on the rotating shaft, and the rotating shaft is installed in the casing; wherein the front end of the air injection channel has at least one opening, the rear end of the air injection channel is embedded in the tail of the rotating shaft, the tail end of the rotating shaft is connected to a first closed bearing, the first closed bearing is connected to a gas source, and when the gas source is connected to the air injection channel, the front end of the air injection channel is opened to spray gas; The rotor core is disassembled to obtain steel sheets, and permanent magnet grooves, magnetic separation air grooves and air injection channel grooves are formed on the steel sheets; wherein the shape of the air injection channel groove matches the shape of the air injection channel; Permanent magnets are assembled into the permanent magnet grooves, the steel sheets are stacked according to a first rule to obtain a rotor, and the rotor is assembled into the rotating shaft; wherein the first rule refers to setting a vacant space after stacking a fixed number of steel sheets, and the vacant space is used as an air duct for the air injection channel to spray air flow; The rear end cover of the casing is removed, and a heat dissipation cover is manufactured according to the diameter of the rear end cover, the heat dissipation cover is provided with a bearing groove and an air outlet hole, and the heat dissipation cover is assembled into the casing; A frequency converter is installed on the casing to obtain a remanufactured permanent magnet synchronous motor.

[0006] The technical solutions described above in the embodiments of the present application have at least the following technical effects: The copper alloy wire processing equipment waste motor permanent magnetization regeneration method provided by the application first disassembles the waste asynchronous motor, retains the undamaged machine shell, stator, rotor core and rotating shaft, and washes the retained parts, then installs the stator into the machine shell, and in this step, the waste motor is disassembled and recovered, and the retained parts are washed. Secondly, the size of the air jet channel is determined according to the diameter of the rotating shaft, and two or more air jet channels are arranged at equal angles on the rotating shaft, then the rotating shaft is installed into the machine shell, and in this step, the size of the air jet channel is determined and the air jet channel is installed, cooling is performed by using the air jet channel to spray air, and the position of the air jet channel is on the rotating shaft, which is beneficial to improving the cooling efficiency. Subsequently, the rotor core is disassembled to obtain steel sheets, and permanent magnet grooves, magnetic separation air grooves and air jet channel grooves are formed on the steel sheets, and in this step, the rotor core is disassembled for remanufacturing, which is beneficial to subsequent permanent magnetization modification of the rotor. Then, the permanent magnets are assembled into the permanent magnet grooves, the steel sheets are stacked according to a first rule to obtain a rotor, and the rotor is assembled into the rotating shaft, and in this step, the permanent magnetization modification and assembly of the rotor are completed, and the rotor in which the air jet channel blows air flow has an air duct that blows air flow from inside to outside, which can cool the rotor and also remove the heat accumulated between the steel sheets, greatly improving the cooling efficiency of the rotor and solving the problem of insufficient heat dissipation performance of the prior art. Then, the rear end cover of the machine shell is removed, a heat dissipation machine cover is manufactured according to the diameter of the rear end cover, bearing grooves and air outlets are formed on the heat dissipation machine cover, and the heat dissipation machine cover is assembled onto the machine shell, and in this step, the rear end cover of the machine shell is modified to adapt to the air jet channel and the corresponding cooling method, the modified heat dissipation machine cover has better sealing performance, and the problem of insufficient sealing performance of the prior art is solved. Finally, a frequency converter is installed on the top of the machine shell to obtain a remanufactured permanent magnet synchronous motor, and in this step, the frequency converter is installed on the motor to make the motor have fast and accurate speed changing performance, and the remanufactured permanent magnet synchronous motor is obtained. In this method, the most important difference from the ordinary permanent magnetization remanufacturing method is that the rotating shaft, rotor and machine shell are modified, air is sprayed from the inside of the rotor by using the air jet channel, cooling is performed, the cooling efficiency is greatly improved, and because the air flowing through the inside of the motor is discharged to the air source, the sealing performance of the motor is greatly improved. The remanufactured motor obtained by the method can be used on the copper alloy wire processing equipment, and the problem of insufficient sealing performance and heat dissipation performance of the remanufactured motor obtained by the prior art is solved.

[0007] In a second aspect, the embodiments of the application provide a remanufactured permanent magnet synchronous motor, comprising: A machine shell, the machine shell includes a frequency converter, the machine shell has a foot support, and the surface of the machine shell has a heat dissipation fin; A rotating shaft arranged in the machine shell, and a section of the rotating shaft is installed in the front bearing, the rotating shaft includes two or more air jet channels, the front end of the air jet channel has at least one opening, and the rear end of the air jet channel is embedded into the tail of the rotating shaft. The stator, disposed within the housing, includes a stator core and a stator winding, the stator winding being wound on the stator core, and the current on the stator winding being controlled by the frequency converter; The rotor is mounted on the rotating shaft and aligned with the stator. The rotor is composed of steel sheets and permanent magnets, and has an empty space. The steel sheets have permanent magnet slots, magnetically shielding air slots, air jet slots, and a second rotating shaft slot. The permanent magnets are embedded in the permanent magnet slots. The air jet slots are aligned with the air jets. The second rotating shaft slot is aligned with the rotating shaft. The empty space is aligned with the opening of the air jet. A first sealed bearing is disposed at the end of the rotating shaft. The other end of the first sealed bearing is connected to an air source through a pipe. When the air source is ventilated, the airflow passes through the end of the rotating shaft and then ejects gas from the front opening of the jet passage. The housing also includes: A front cover is disposed at the front end of the housing, and the front cover has a first pivot groove at its center; The front bearing is disposed within the first shaft groove; A heat dissipation cover is located at the rear end of the housing and has a third pivot groove and an air outlet. Airflow inside the housing flows out through the air outlet. The rear bearing is disposed within the third shaft groove; A rear bearing cover is disposed on the rotating shaft and located behind the rear bearing; A fan is mounted on the shaft and located behind the rear bearing cover. Attached Figure Description

[0008] 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.

[0009] Figure 1 This is a schematic diagram of the modified shaft provided in one embodiment of this application; Figure 2 This is a schematic diagram of the modified rotor provided in one embodiment of this application; Figure 3 This is a schematic diagram of the modified steel sheet provided in one embodiment of this application; Figure 4 This is a schematic diagram of the structure of a heat dissipation cover provided in one embodiment of this application; Figure 5 This is an exploded structural diagram of a remanufactured permanent magnet synchronous motor provided in an embodiment of this application; Figure 6 This is another exploded structural diagram of a remanufactured permanent magnet synchronous motor provided in one embodiment of this application; Figure 7 This is a schematic diagram of the front cover and the second air passage provided in one embodiment of this application; Figure 8 This is a schematic diagram of the structure of a remanufactured permanent magnet synchronous motor provided in one embodiment of this application; The following are the labeling elements in the figure: 1. Shaft; 11. Middle of shaft; 12. Tail of shaft; 13. Air duct; 131. Air duct opening; 14. Shaft junction; 15. End of shaft; 2. Rotor; 21. Steel sheet; 211. Permanent magnet slot; 212. Magnetic shielding air slot; 213. Second shaft slot; 214. Air duct slot; 22. Empty space; 3. Heat sink cover; 31. Air outlet; 32. Third shaft slot; 4. Stator; 5. Rear bearing; 6. Rear bearing cover; 7. Fan; 8. First sealed bearing; 9. Front cover; 10. Front bearing; 01. Housing. Detailed Implementation

[0010] 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.

[0011] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the application. The terms “comprising” and “having”, and any variations thereof, in the specification, claims, and foregoing description of the drawings are intended to cover non-exclusive inclusion.

[0012] 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.

[0013] It should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., 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 application 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 application.

[0014] 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 application, "multiple" means two or more, unless otherwise explicitly specified.

[0015] In this application, "and / or" is merely a way of describing the relationship between related objects, indicating that three relationships can exist; for example, A and / or B can represent three cases: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects have an "or" relationship.

[0016] It should be noted that in this application, the words "in some embodiments," "exemplarily," and "for example" are used to indicate examples, illustrations, or descriptions. Any embodiment or design described in this application as "in some embodiments," "exemplarily," or "for example" should not be construed as being more preferred or advantageous than other embodiments or design solutions. Specifically, the use of words such as "in some embodiments," "exemplarily," and "for example" is intended to present related concepts in a specific manner, meaning that a particular feature, structure, or characteristic described in connection with the embodiment may be included in at least one embodiment of this application. The appearance of the above words in various places in the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment that is mutually exclusive with other embodiments. Those skilled in the art will explicitly and implicitly understand that the embodiments described herein can be combined with other embodiments.

[0017] Permanent magnet remanufacturing technology is a technique that transforms old motors into high-efficiency permanent magnet motors, offering advantages such as energy saving, environmental protection, and resource recycling. Three-phase asynchronous motors are widely used in existing copper alloy wire processing equipment due to their low cost and reliability. However, the difficulty in speed regulation of three-phase asynchronous motors prevents them from processing high-precision copper alloy wires. Permanent magnet remanufacturing technology can be used to transform discarded three-phase asynchronous motors into permanent magnet synchronous motors with accurate and fast speed regulation, upgrading low-precision copper alloy wire processing equipment to equipment capable of processing high-precision copper alloy wires. This approach not only recycles resources but also avoids major changes to the supply chain.

[0018] Existing permanent magnet remanufacturing technologies do not consider the processing environment of copper alloy wires. In such environments, for example, the copper wire drawing process generates a large amount of copper alloy powder, which may be a copper-nickel alloy. This powder is attracted by the permanent magnet, leading to an increased motor failure rate. Furthermore, online annealing of copper alloy wires can result in high processing temperatures, accelerating the aging of the permanent magnet motor. Therefore, remanufactured permanent magnet synchronous motors modified using existing permanent magnet remanufacturing technologies have insufficient sealing and heat dissipation performance when used in copper alloy wire processing equipment.

[0019] Based on this, in order to improve the problem of insufficient sealing and heat dissipation performance of the modified remanufactured permanent magnet synchronous motors used in copper alloy wire processing equipment, the embodiments of this application provide the following solutions.

[0020] Please refer to the following: Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 5 This application provides a method for permanent magnet recycling of waste motors from copper alloy wire processing equipment. The waste motor is a waste asynchronous motor, which includes: a housing 01, a stator 4, a rotor core, rotor windings, and a shaft 1. The method includes... The old asynchronous motor was disassembled, and the undamaged housing 01, stator 4, rotor core and shaft 1 were retained. The retained parts were cleaned, and then the stator 4 was installed into the housing 01. The rotor windings were discarded. The specifications of the jet duct 13 are determined according to the diameter of the rotating shaft 1, and two or more jet ducts 13 are set at equal angular intervals on the rotating shaft 1. The rotating shaft 1 is then installed into the housing 01. The front end of the jet duct 13 has at least one opening 131, the rear end of the jet duct 13 is embedded in the tail 12 of the rotating shaft 1, and the end 15 of the rotating shaft 1 is connected to the first sealed bearing 8. The first sealed bearing 8 is connected to the air source. When the air source is connected, gas is ejected from the front opening 131 of the jet duct 13. The rotor core is disassembled to obtain steel sheets 21, and permanent magnet slots 211, magnetically shielding air slots 212, and air jet slots 214 are formed on the steel sheets. Among them, the air jet slots 214 are matched with the shape of the air jet 13; The permanent magnet is assembled into the permanent magnet slot 211, and then the steel sheets 21 are stacked according to the first rule to obtain the rotor 2. The rotor 2 is then assembled into the rotating shaft 1. The first rule refers to setting an empty space 22 after stacking a fixed number of steel sheets 21. The empty space 22 is used as the air duct for the air jet duct 13 to eject the airflow. Remove the rear end cover of the housing 01 and manufacture the heat dissipation cover 3 according to the diameter of the rear end cover. The heat dissipation cover has a third pivot groove 32 and an air vent 31. Then assemble the heat dissipation cover 3 onto the housing 01. By adding a frequency converter 011 to the housing 01, a remanufactured permanent magnet synchronous motor is obtained.

[0021] As can be seen from the above, the jet duct 13 can be a hollow pipe made of various metal materials, and the permanent magnet can be various permanent magnet materials.

[0022] It is understandable that this method recycles undamaged components of the waste asynchronous motor, including the casing 01, stator 4, rotor core, and shaft 1. For the stator 4, this method does not require any modification steps, while for the shaft 1 and rotor core, this method requires many modification steps, and also requires some modification steps for the casing 01.

[0023] First, for the rotating shaft 1, this method newly sets at least two jet channels 13 on the rotating shaft 1. The jet channels 13 can be connected to the middle part 11 of the rotating shaft 1 by welding. The jet channel 13 is hollow and has at least one opening 131. At the junction 14 of the rotating shaft 1, the jet channel 13 bends and is embedded into the tail 12 of the rotating shaft 1. A groove of the corresponding size can be milled on the rotating shaft 1 first, and then the jet channel 13 is embedded into the groove. The connection method can be welding or gluing. After embedding, it can be polished to ensure that the surface of the rotating shaft 1 is smooth enough. The embedded section of the jet channel 13 can be seen at the end 15 of the rotating shaft 1. Moreover, the end 15 of the rotating shaft 1 is connected to one end of the first sealed bearing 8, and the other end of the first sealed bearing 8 is connected to the air source (the first sealed bearing 8 is an airtight bearing). After the air source is turned on, the airflow direction is: first sealed bearing 8 -> end 15 -> jet channel 13 -> opening 131.

[0024] Secondly, for the rotor core, this method first disassembles it to obtain multiple steel sheets 21. Each steel sheet 21 has a second shaft groove 213. The steel sheet 21 can be a silicon steel sheet. Then, permanent magnet grooves 211, magnetic air grooves 212, and air jet grooves 214 are opened on it. The air jet grooves 214 are aligned with the air jet 13. Then, permanent magnets are embedded in the permanent magnet grooves 211. Finally, the steel sheets 21 are stacked according to the first rule. The first rule means that after stacking a fixed number of steel sheets 21, a space is left empty. Therefore, the rotor 2 after the final modification has an empty space 22, and the empty space 22 is aligned with the air jet opening 131, which is used as the air duct for the air jet 13 to eject the airflow.

[0025] Finally, regarding the housing 01, after the modification of the shaft 1 by this method, the original rear end cover of the housing 01 may not be able to align with the shaft 1. Therefore, after directly removing the rear end cover, a new heat dissipation cover 3 is manufactured. The heat dissipation cover 3 includes an air vent 31 and a third shaft groove 32. The air vent 31 is used for the gas inside the motor to flow out, and the third shaft groove 32 is used to connect with the shaft 1.

[0026] At this point, the modification of the scrap motor parts is complete. Among the various components, only the size of the shaft 1 has changed incrementally. Furthermore, the modification steps of the rotor 2 and the heat sink cover 3 have adapted to the incremental change of the shaft 1. Therefore, the modified motor can be obtained simply by following the original installation process of the scrap motor. Finally, a frequency converter is added to the casing to obtain the remanufactured permanent magnet synchronous motor.

[0027] As can be seen from the above, the permanent magnet regeneration method for waste motors of copper alloy wire processing equipment provided in this application adds an air jet channel 13 to the rotating shaft 1, so that the airflow flows out from the inside of the rotor 2 to the outside, cooling the rotor 2 from the inside out, which can greatly improve the cooling efficiency of the rotor 2 and increase the working life of the permanent magnet. Moreover, only the airflow of the air source flows through the inside of the motor, so as long as the purity of the air source is ensured, the sealing performance of the motor can be guaranteed, thus greatly improving the sealing performance of the motor.

[0028] With this setup, in the precision machining of copper alloy wires, such as the ultra-fine copper alloy wire drawing process, the motor does not need to have a large torque, but has greater requirements for heat dissipation performance, sealing performance and speed change performance. Therefore, by sacrificing the maximum torque of the motor to improve the heat dissipation performance and sealing performance of the motor (leaving empty space 22 in rotor 2 will increase the magnetic leakage of rotor 2 and reduce the maximum torque of the motor), the remanufactured permanent magnet synchronous motor obtained by this method can be used on precision machining equipment for copper alloy wires.

[0029] In some embodiments, please refer to the following: Figure 2 and Figure 3 The rotor 2 is obtained by stacking steel sheets 21 according to the first rule, including: After stacking N steel sheets 21, four support columns are symmetrically installed on the last steel sheet 21 of the N sheets. The support columns are used to create empty space 22.

[0030] It is understandable that N is a preset constant. After stacking N steel sheets 21, a space is left empty without placing steel sheets 21. A support column is set in the empty space 22 to establish and maintain the empty space 22. Both ends of the support column can be suction cups, which are tightly attached between the two steel sheets 21 to prevent the support column from being thrown off when the rotor 2 rotates.

[0031] This setting can stably maintain 22 empty spaces.

[0032] Optionally, in some embodiments, please refer to Figure 4 The methods also include: A temperature sensor is placed at the air outlet 31 of the heat sink cover 3. The temperature sensor detects the first temperature information of the gas flowing out of the air outlet 31 in real time. Based on the first temperature information, the airflow supply speed of the gas source is dynamically adjusted.

[0033] It can be understood that the cooling path of the airflow in the entire motor is: jet duct opening 131 -> empty space 22 -> air outlet 31. That is, the end point of the cooling airflow is the air outlet 31. A temperature sensor is placed in the air outlet 31 to obtain the first temperature information. The first temperature information can effectively reflect the temperature level of the entire motor. Then, the airflow supply speed of the air source is dynamically adjusted according to the first temperature information so that the airflow supply speed is higher when the motor temperature is high and lower when the motor temperature is low.

[0034] With this configuration, cooling efficiency is also improved when the motor temperature is high.

[0035] Optionally, the airflow supply temperature of the gas source can be dynamically adjusted based on the first temperature information.

[0036] It is understandable that, in addition to adjusting the airflow supply speed of the air source, a compressor can also be added to the air source to make the airflow temperature lower. When the first temperature information indicates that the motor temperature is higher, the airflow supply temperature is also lower.

[0037] This design improves the motor's cooling performance.

[0038] In some embodiments, please refer to Figures 1 to 7 The methods also include: A second jet duct 91 is provided on the front cover 9; wherein, the second jet duct 91 is annular and is provided on the inner wall of the front cover 9. The second jet duct 91 is connected to an air source, and the airflow ejected from the second jet duct 91 flows from the front cover 9 to the radiator cover 3.

[0039] It is understandable that if cooling is only carried out according to the cooling path of "air jet opening 131 -> empty space 22 -> air outlet 31", then the components in and around the front cover 9 of the motor will not be cooled by airflow, which will lead to uneven temperature inside the entire motor. Therefore, a second air jet 91 is set on the front cover 9. The second air jet 91 is annular and is set on the inner wall of the front cover 9. The second air jet 91 is connected to the air source (because the second air jet 91 is fixed on the front cover 9, an opening can be made in the front cover 9 and the air source can be connected through a pipe). The airflow from the second air jet 91 flows from the front cover 9 to the heat sink cover 3, which adds a cooling path of "second air jet 91 -> front cover 9 -> air outlet 31", which can solve the problem of uneven temperature inside the entire motor.

[0040] This design ensures that the entire interior of the motor is cooled by airflow, resulting in a more uniform internal temperature.

[0041] Optionally, before stacking the steel sheets 21, the steel sheets 21 can be ground and then insulated.

[0042] It is understandable that the steel sheet 21 obtained from the dismantling of the scrap rotor core may have problems such as damaged insulation layer and low surface quality, which may lead to excessive magnetic loss and excessive heat generation. Therefore, before the steel sheet 21 is stacked, it is ground and then re-insulated to solve the problems of damaged insulation layer and low surface quality of the steel sheet 21.

[0043] This configuration can improve the performance of remanufactured permanent magnet synchronous motors.

[0044] Optionally, the air source is an air pump with a dustproof screen that has an air inlet more than 3 meters above the ground.

[0045] It is understandable that being more than 3 meters above the ground can isolate most of the metal powder generated during the copper alloy wire drawing process, or the metal waste generated during other processing processes. Therefore, using an air pump with a dustproof screen and an air inlet more than 3 meters above the ground as the air source can effectively ensure the purity of the gas source.

[0046] This configuration improves the motor's sealing performance.

[0047] Optionally, a one-way valve can be installed at the air outlet 31, with the air flow direction of the one-way valve being from the inside of the motor to the outside of the motor.

[0048] It is understandable that when the motor stops, air no longer flows out of the vent 31. At this time, floating metal powder may enter the motor through the vent 31. Therefore, a one-way valve is installed at the vent 31. The one-way valve can be a simple plastic valve. The air flow direction of the one-way valve is from the inside of the motor to the outside of the motor, which can prevent floating metal powder from entering the motor through the vent 31 when the motor stops.

[0049] This configuration improves the motor's sealing performance.

[0050] Please see Figures 1 to 6 This application embodiment also provides a remanufactured permanent magnet synchronous motor, the remanufactured permanent magnet synchronous motor comprising: The housing 01 includes an inverter 011, and the housing 01 has a stand 012 at the bottom. The surface of the housing 01 has a heat sink 013. A rotating shaft 1 is disposed inside the housing 01, and a section of the rotating shaft 1 is installed in the front bearing 10. The rotating shaft 1 includes two or more jet passages 13. The front end of the jet passage 13 has at least one opening 131, and the rear end of the jet passage 13 is embedded in the tail 12 of the rotating shaft 1. Stator 4 is located inside housing 01 and includes stator core and stator winding. The stator winding is wound on the stator core and the current on the stator winding is controlled by frequency converter. The rotor 2 is mounted on the shaft 1 and aligned with the stator 4. The rotor 2 is composed of steel sheets 21 and permanent magnets, and has an empty space 22. The steel sheets 21 have permanent magnet slots 211, magnetic air slots 212, jet duct slots 214 and a second shaft slot 213. The permanent magnets are embedded in the permanent magnet slots 211. The jet duct slots 214 are aligned with the jet ducts 13. The second shaft slot 213 is aligned with the shaft 1. The empty space 22 is aligned with the jet duct opening 131. The first sealed bearing 8 is located at the end of the rotating shaft 1. The other end of the first sealed bearing 8 is connected to the air source through a pipe. When the air source is ventilated, the airflow passes through the end of the rotating shaft 1 and then sprays out gas from the jet duct opening 131. The casing 01 also includes: Front cover 9 is located at the front end of housing 01, and the center of front cover 9 has a first pivot groove; The front bearing 10 is disposed in the first shaft groove; The heat dissipation cover 3 is located at the rear end of the housing 01 and has a third pivot groove 32 and an air outlet 31. The airflow inside the housing 01 flows out through the air outlet 31. The rear bearing 5 is located in the third shaft groove 32; The rear bearing cover 6 is mounted on the rotating shaft 1 and is located behind the rear bearing 5; Fan 7 is mounted on shaft 1 and located behind rear bearing cover 6.

[0051] As can be seen from the above, the housing 01, shaft 1, stator 4, rotor 2, first sealed bearing 8, front end cover 9, front bearing 10, rear bearing 5, rear bearing cover 6, and fan 7 can all be components of common asynchronous motors, and the material of the heat dissipation cover 3 can be the same as the material of the end cover of common asynchronous motors.

[0052] As can be seen from the above, the remanufactured permanent magnet synchronous motor provided in this application improves both the sealing and heat dissipation performance of the motor by changing the cooling airflow path. Specifically, an air jet duct 13 is added to the shaft 1, and the rotor 2 is modified to include a permanent magnet and an empty space 22. The airflow cools the rotor 2 from the center outward, greatly improving the cooling performance. While ensuring the purity of the gas source, it also significantly improves the sealing performance of the motor.

[0053] It is understandable that ordinary air-cooled permanent magnet synchronous motors cool the motor through airflow that runs through the entire motor. The airflow cannot reach the inside of the rotor, and can only cool the outside of the rotor, resulting in a very high temperature inside the rotor. This causes the permanent magnets to work in a high-temperature environment. If the motor is then operated in a high-temperature environment, the permanent magnets will age and demagnetize rapidly. Therefore, this method completely changes the cooling method of the motor in order to enable the remanufactured permanent magnet synchronous motor to operate in copper alloy wire processing equipment with high ambient temperatures. By sacrificing some of the maximum torque, better sealing and heat dissipation performance is obtained, enabling the remanufactured permanent magnet synchronous motor to operate better in copper alloy wire processing equipment.

[0054] Figure 8 The diagram shows the structure of the entire remanufactured permanent magnet synchronous motor.

[0055] 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 method for permanent magnet recycling of waste motors from copper alloy wire processing equipment, characterized in that, The scrapped motor is a scrapped asynchronous motor, which includes: a housing, a stator, a rotor core, rotor windings, and a shaft. The method includes: Disassemble the old asynchronous motor, retain the undamaged housing, stator, rotor core and shaft, clean the retained parts, and then install the stator into the housing; wherein the rotor winding is discarded. The specifications of the jet passage are determined according to the diameter of the rotating shaft, and two or more jet passages are set at equal angular intervals on the rotating shaft. The rotating shaft is then installed into the housing. The front end of the jet passage has at least one opening, the rear end of the jet passage is embedded in the tail of the rotating shaft, and the end of the rotating shaft is connected to a first sealed bearing. The first sealed bearing is connected to an air source. When the air source is supplied, gas is ejected from the front opening of the jet passage. The rotor core is split into steel sheets, and permanent magnet slots, magnetically shielding air slots, and air jet slots are formed on the steel sheets; wherein the air jet slots match the shape of the air jet. The permanent magnet is assembled into the permanent magnet slot, and the steel sheets are stacked according to the first rule to obtain the rotor. The rotor is then assembled into the rotating shaft. The first rule refers to setting a section of empty space after stacking a fixed number of steel sheets. The empty space is used as the air duct for the airflow ejected from the jet duct. Remove the rear end cover of the housing and manufacture a heat dissipation cover according to the diameter of the rear end cover. The heat dissipation cover has bearing grooves and air vents. Then assemble the heat dissipation cover onto the housing. By installing a frequency converter on the housing, a remanufactured permanent magnet synchronous motor is obtained.

2. The method for permanent magnet regeneration of waste motors from copper alloy wire processing equipment as described in claim 1, characterized in that, The process of stacking the steel sheets according to a first rule to obtain the rotor includes: After N steel sheets are stacked, four support columns are symmetrically installed on the last steel sheet among the N sheets; wherein, the support columns are used to establish the empty space.

3. The method for permanent magnet recycling of waste motors from copper alloy wire processing equipment as described in claim 1, characterized in that, The method further includes: A temperature sensor is placed at the air outlet of the heat sink cover, and the temperature sensor detects the first temperature information of the gas flowing out of the air outlet in real time. Based on the first temperature information, the airflow supply speed of the gas source is dynamically adjusted.

4. The method for permanent magnet recycling of waste motors in copper alloy wire processing equipment as described in claim 3, characterized in that, Based on the first temperature information, the airflow supply temperature of the gas source is dynamically adjusted.

5. The method for permanent magnet recycling of waste motors from copper alloy wire processing equipment as described in claim 1, characterized in that, The method further includes: A second jet duct is provided on the front end cover of the housing; wherein, the second jet duct is annular and is provided on the inner wall of the front end cover, the second jet duct is connected to the air source, and the airflow ejected from the second jet duct flows from the front end cover to the heat dissipation cover.

6. The method for permanent magnet recycling of waste motors from copper alloy wire processing equipment as described in claim 1, characterized in that, Before the steel sheets are stacked, they are first ground and then insulated.

7. The method for permanent magnet recycling of waste motors from copper alloy wire processing equipment as described in claim 1, characterized in that, The air source is an air pump with a dustproof screen, whose air inlet is more than 3 meters above the ground.

8. The method for permanent magnet recycling of waste motors from copper alloy wire processing equipment as described in claim 1, characterized in that, A one-way valve is installed at the air outlet, and the air passage direction of the one-way valve is from the inside of the motor to the outside of the motor.

9. A remanufactured permanent magnet synchronous motor, comprising: A housing, the housing including a frequency converter, the housing having a support frame underneath, and the housing having heat sinks on its surface; A rotating shaft is disposed within the housing, and a section of the rotating shaft is installed in the front bearing. The rotating shaft includes two or more jet passages, each jet passage having at least one opening at its front end and its rear end embedded into the tail of the rotating shaft. The stator, disposed within the housing, includes a stator core and a stator winding, the stator winding being wound on the stator core, and the current on the stator winding being controlled by the frequency converter; The rotor is mounted on the rotating shaft and aligned with the stator. The rotor is composed of steel sheets and permanent magnets, and has an empty space. The steel sheets have permanent magnet slots, magnetically shielding air slots, air jet slots, and a second rotating shaft slot. The permanent magnets are embedded in the permanent magnet slots. The air jet slots are aligned with the air jets. The second rotating shaft slot is aligned with the rotating shaft. The empty space is aligned with the opening of the air jet. A first sealed bearing is disposed at the end of the rotating shaft. The other end of the first sealed bearing is connected to an air source through a pipe. When the air source is ventilated, the airflow passes through the end of the rotating shaft and then ejects gas from the front opening of the jet passage. The housing also includes: A front cover is disposed at the front end of the housing, and the front cover has a first pivot groove at its center; The front bearing is disposed within the first shaft groove; A heat dissipation cover is located at the rear end of the housing and has a third pivot groove and an air outlet. Airflow inside the housing flows out through the air outlet. The rear bearing is disposed within the third shaft groove; A rear bearing cover is disposed on the rotating shaft and located behind the rear bearing; A fan is mounted on the shaft and located behind the rear bearing cover.

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