Method for remanufacturing asynchronous motor into self-starting synchronous reluctance motor and motor

Abstract

This invention discloses a method and motor for remanufacturing an asynchronous motor into a self-starting synchronous reluctance motor, relating to the field of motor remanufacturing and solving the problem of high-efficiency remanufacturing of asynchronous motors. This invention disassembles and recycles most of the materials from old, low-efficiency asynchronous motors, retaining the stator assembly and several accessories. The cast aluminum components of the rotor assembly are melted down and recycled. The newly manufactured rotor laminations are reassembled with the original stator assembly and accessories, and the newly manufactured rotor laminations are equipped with several air grilles. The motor remanufactured using this synchronous reluctance method has improved energy efficiency; by recycling most of the raw materials from the old, low-efficiency asynchronous motor, the cost of purchasing a new, high-efficiency motor is significantly reduced.

Description

Technical Field

[0001] This invention relates to the field of motor remanufacturing technology, specifically to a method and motor for remanufacturing an asynchronous motor into a self-starting synchronous reluctance motor. Background Technology

[0002] As one of the most widely used power devices in industrial production and people's lives, asynchronous motors account for a significant proportion of global electricity consumption. According to relevant statistics, in my country's industrial sector, asynchronous motors account for more than 60% of total industrial electricity consumption. Among them, a large number of traditional asynchronous motors in operation generally suffer from low efficiency due to limitations in design technology and manufacturing processes, resulting in huge energy waste during operation.

[0003] To improve motor energy efficiency, major motor R&D and manufacturing companies have launched the latest high-efficiency motor products to meet market demand. Currently, common high-efficiency motor technologies include using lower-loss, higher-grade silicon steel cores, replacing cast aluminum asynchronous motor rotors with copper rotors, or using permanent magnet motors, including flat wire windings with lower copper losses, increasing slot fill factor, and reducing copper losses, thereby improving overall motor energy efficiency. While these newly designed and developed high-efficiency motors are advanced in performance indicators and energy efficiency levels, purchasing new high-efficiency motors often requires a large one-time investment. High-efficiency motors are typically 20-30% more expensive than traditional low-efficiency asynchronous motors, which poses a significant obstacle to user adoption and promotion. Against this backdrop, high-efficiency motor remanufacturing technology has emerged. Motor remanufacturing refers to the process of dismantling old, inefficient asynchronous motors that do not meet energy efficiency standards, recycling some materials, and then reprocessing and remanufacturing them. After remanufacturing, these inefficient motors can achieve higher energy efficiency levels. This not only meets national energy efficiency requirements but also lowers the financial barrier for users to upgrade to high-efficiency motors, saves material consumption, reduces carbon emissions during new motor production, achieves resource recycling, and protects the environment. The government has also introduced various policies to support the large-scale and standardized development of the motor remanufacturing industry. These policies provide a favorable policy environment and development opportunities for high-efficiency asynchronous motor remanufacturing and also create an urgent need for upgrading and transforming traditional asynchronous motors.

[0004] From a resource utilization perspective, directly scrapping traditional asynchronous motors after they reach the end of their service life not only wastes a large amount of metal resources (such as copper, iron, and silicon steel sheets), but also pollutes the environment due to improper disposal of motor waste. High-efficiency remanufacturing of asynchronous motors, however, involves a series of technical means such as testing, disassembly, repair, and upgrading of used asynchronous motors, enabling the remanufactured motor to achieve or exceed the performance level of the original motor, and even achieve higher efficiency and energy efficiency ratings. This approach not only effectively conserves metal resources, reduces waste emissions, and minimizes environmental impact, but also significantly reduces equipment procurement costs for enterprises, improving their economic benefits and market competitiveness.

[0005] From the perspective of market demand, with the continuous advancement of my country's industrialization and the optimization and upgrading of its industrial structure, more and more industries and enterprises are placing higher demands on the efficiency, reliability, and energy efficiency of motors. Traditional inefficient asynchronous motors can no longer meet the current industrial production's demand for high-quality power equipment. Enterprises urgently need to upgrade and transform existing inefficient motors to reduce production costs, improve production efficiency, and achieve green production.

[0006] From a technological development perspective, significant progress has been made in recent years in areas such as motor design, materials science, and manufacturing processes, providing solid technical support for the high-efficiency remanufacturing of asynchronous motors. For example, the continuous maturation of technologies such as high-grade silicon steel sheets, high-performance permanent magnet materials, and efficient winding manufacturing processes enables the use of more advanced technologies and materials in the remanufacturing process of asynchronous motors, significantly improving motor efficiency and performance. Simultaneously, advancements in motor testing and fault diagnosis technologies have provided strong support for quality control and reliability assurance in the remanufacturing process, ensuring that the quality and performance of remanufactured motors meet relevant standards. Summary of the Invention

[0007] To address the aforementioned problem of high-efficiency remanufacturing of asynchronous motors, this invention proposes a method and motor for remanufacturing an asynchronous motor into a self-starting synchronous reluctance motor. This invention remanufactures a synchronous reluctance motor by recycling most of the materials from old, low-efficiency asynchronous motors, enabling it to start automatically at power frequency. The energy efficiency of the remanufactured synchronous reluctance motor is improved. Furthermore, the recycling of most of the raw materials from the original old, low-efficiency asynchronous motor significantly reduces the cost of purchasing a new, high-efficiency motor.

[0008] This invention proposes a method for remanufacturing an asynchronous motor into a self-starting synchronous reluctance motor, which specifically includes the following steps: Step 1: Disassemble the asynchronous motor to obtain the asynchronous motor rotor assembly, asynchronous motor stator assembly, and several accessories. Keep the asynchronous motor stator assembly and accessories. Step 2: Disassemble the asynchronous motor rotor assembly to obtain the cast aluminum rotor core, bearings, and shaft. Keep the bearings and shaft, and disassemble and recycle the cast aluminum rotor core. Step 3: Manufacturing synchronous reluctance rotor laminations, wherein two synchronous reluctance rotor laminations are provided with several rotor slots, and the remaining synchronous reluctance rotor laminations are provided with several rotor slots and several sets of air grid structures; and stacking several synchronous reluctance rotor laminations into shape. Step 4: Manufacture new guide bars and end rings, and install them onto several synchronous reluctance rotor laminations after stacking to form the rotor core. Perform dynamic balancing tests on the rotor core. Step 4: Press-fit and remanufacture the rotor core, bearings, and shaft into a rotor assembly; Step 5: Assemble the synchronous reluctance rotor assembly, the asynchronous motor stator assembly, and several accessories to obtain the self-starting synchronous reluctance motor and conduct testing.

[0009] Furthermore, the guide bars and end rings in step three are made from metallic aluminum smelted from the cast aluminum rotor core.

[0010] Furthermore, the synchronous reluctance rotor lamination in step three is obtained by stamping or remanufacturing the rotor laminations after disassembling the cast aluminum rotor core of the asynchronous motor.

[0011] A motor manufactured using the above-mentioned asynchronous motor remanufacturing self-starting synchronous reluctance motor method specifically includes two end covers, a stator assembly, and a rotor assembly. The rotor assembly is coaxially rotatably disposed inside the stator assembly. An end cover is disposed at each end of the stator assembly. The end covers and the rotor assembly are rotatably connected.

[0012] Furthermore, the stator assembly includes a housing and a stator core, with the stator core disposed on the inner wall of the housing and windings disposed on the stator core.

[0013] Furthermore, the rotor assembly includes a rotor core and a shaft, with the rotor core coaxially sleeved on the shaft, and the shaft and end cover rotatably connected.

[0014] Furthermore, the rotor core includes several synchronous reluctance rotor laminations, several guide bars, and two end rings. The several synchronous reluctance rotor laminations are stacked to form the core body, and several guide bars are axially arranged on the core body. An end ring is provided at each end of the core body.

[0015] Furthermore, the synchronous reluctance rotor lamination includes two rotor laminations 1 and several rotor laminations 2, with the several rotor laminations 2 sandwiched between the two rotor laminations 1. Several rotor slots are evenly arranged around the edges of the rotor laminations 1 and 2. Several sets of air grid structures are evenly arranged around the inner circumference of the rotor slots of the rotor laminations 2. The air grid structure includes several layers of air grids.

[0016] Furthermore, the outer circumference of the synchronous reluctance rotor lamination has a wavy structure.

[0017] Furthermore, the shaft and the end cap are connected by a bearing.

[0018] The beneficial effects of the method for remanufacturing an asynchronous motor and starting a self-starting synchronous reluctance motor described in this invention, and the motor itself, are as follows: (1) The asynchronous motor remanufacturing self-starting synchronous reluctance motor method and motor described in this invention have a running speed that is the synchronous speed corresponding to the power supply frequency. In actual operation, there is no rotor slip loss similar to that of an asynchronous motor, nor is there eddy current loss of the permanent magnet motor. The rotor loss is close to zero, which effectively improves the motor efficiency and can improve the energy efficiency level by an average of 1-2 levels. Furthermore, since the rotor loss is close to zero, the rotor heating phenomenon is greatly improved. For high-speed operation, the problem of rotor heating restricting the overall power of the motor is solved, thereby further improving the continuous power of the motor.

[0019] (2) The asynchronous motor remanufacturing self-starting synchronous reluctance motor method and motor described in this invention do not have a rotor magnetic field provided by permanent magnets. Instead, they utilize the asymmetry of the quadrature and direct axis magnetic circuits on the rotor side to obtain the difference in quadrature and direct axis inductance to maximize torque output. Essentially, it belongs to a synchronous reluctance motor. Furthermore, since the rotor does not have permanent magnets and only has silicon steel sheets, the motor cost is lower. The synchronous rotation of silicon steel sheets does not result in core loss, so silicon steel sheets with poor loss characteristics can be used, thereby reducing the cost of motor remanufacturing. At the same time, since the stator assembly and shaft end cover are retained to the greatest extent, the system modification cost is lower. If the rotor laminations after disassembling the cast aluminum rotor core of the asynchronous motor are reprocessed, there is no need to add high-performance electrical materials. It relies entirely on the rotor material of the original asynchronous motor. Only secondary processing is required to achieve the synchronous reluctance modification of the whole machine. The manufacturing cost involved in this process is mainly the smelting and recasting of aluminum, the punching of air grid slots, and the stacking of rotor cores. The overall manufacturing cost can be further reduced.

[0020] (3) The asynchronous motor remanufacturing self-starting synchronous reluctance motor method and motor described in this invention retain the squirrel cage rotor structure, so no special frequency converter is required. Asynchronous start-up and synchronous operation can be achieved simply by relying on the power frequency grid. Furthermore, the synchronous reluctance rotor core with air grid punched out also has self-starting capability and can complete the start-up operation without a special frequency converter or controller.

[0021] (4) The asynchronous motor remanufacturing self-starting synchronous reluctance motor method and motor described in this invention, after the start-up process reaches stable operation, the torque output mainly relies on the difference between quadrature axis and direct axis inductance and the saliency ratio. At this time, by optimizing the air grid structure, a larger torque output can be achieved. At this time, the maximum synchronous torque will be greater than the asynchronous torque, which means that the asynchronous motor remanufactured by synchronous reluctance can obtain a greater overload capacity. Attached Figure Description

[0022] The accompanying drawings, which form part of this application, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an improper limitation of the invention.

[0023] In the attached diagram: Figure 1 This is a flowchart of the first method of a method for remanufacturing an asynchronous motor and starting a self-starting synchronous reluctance motor according to the present invention; Figure 2 This is a flowchart of the second method of the asynchronous motor remanufacturing self-starting synchronous reluctance motor described in this invention; Figure 3 This is a schematic diagram of the basic structure of a traditional cast aluminum rotor asynchronous motor; Figure 4 This is a schematic diagram of the structure of a self-starting synchronous reluctance motor remanufactured by the method for remanufacturing an asynchronous motor according to the present invention. Figure 5 This is a side view of the rotor core of a traditional cast aluminum rotor asynchronous motor; Figure 6 This is an axial cross-sectional view of the rotor core of a traditional cast aluminum rotor asynchronous motor; Figure 7 This is an axial cross-sectional view of the rotor core melting and aluminum removal process in a traditional cast aluminum rotor asynchronous motor. Figure 8 This is a schematic diagram of the rotor lamination of the self-starting synchronous reluctance motor remanufacturing method of the asynchronous motor described in this invention; Figure 9 This is a schematic diagram of the rotor lamination 2 of the method for remanufacturing an asynchronous motor and starting a self-starting synchronous reluctance motor according to the present invention; Figure 10 This is a radial cross-sectional view of the rotor core of the asynchronous motor remanufacturing self-starting synchronous reluctance motor method described in this invention; Figure 11 This is an axial cross-sectional view of the rotor core of the asynchronous motor remanufacturing self-starting synchronous reluctance motor method described in this invention; Figure 12This is a schematic diagram of the rotor lamination stamping die structure for a method of remanufacturing an asynchronous motor and starting a self-starting synchronous reluctance motor as described in this invention. Wherein: 1-Bearing, 2-End cover, 3-Rotor core, 301-Synchronous reluctance rotor lamination, 4-Winding, 5-Housing, 6-Stator core, 7-Shaft, 8-End ring, 9-Air grid, 10-Guide bar, 11-Rotor slot. Detailed Implementation

[0024] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. It should be noted that, unless otherwise specified, the embodiments and features described in the embodiments of the present invention can be combined with each other. The described embodiments are merely some embodiments of the present invention, not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0025] Specific implementation method one: See Figures 1-11 This embodiment is described in detail. The method for remanufacturing an asynchronous motor and then starting a self-starting synchronous reluctance motor according to this embodiment specifically includes the following steps: Step 1: Disassemble the asynchronous motor to obtain the asynchronous motor rotor assembly, asynchronous motor stator assembly, and several accessories. Keep the asynchronous motor stator assembly and accessories. The asynchronous motor stator assembly includes the housing 5, stator core 6, and winding 4. The accessories include screws, washers, wave washers, and oil seals, etc. Step 2: Disassemble the asynchronous motor rotor assembly to obtain the cast aluminum rotor core, bearing 1 and shaft 7. Keep bearing 1 and shaft 7, and disassemble and recycle the cast aluminum rotor core. Step 3: Manufacturing synchronous reluctance rotor laminations 301. Synchronous reluctance rotor laminations 301 are manufactured using new materials or by stamping rotor laminations disassembled from the cast aluminum rotor core of an asynchronous motor. Two synchronous reluctance rotor laminations 301 are provided with several rotor slots 11, and the remaining synchronous reluctance rotor laminations 301 are provided with several rotor slots 11 and several sets of air grid structures. Several synchronous reluctance rotor laminations 301 are stacked and formed. Step 4: Manufacture new guide bars 10 and end rings 8. These can be made from new materials or from aluminum smelted from the cast aluminum rotor core of an asynchronous motor. Install the guide bars 10 and end rings 8 onto several synchronous reluctance rotor laminations 301 after stacking to form the rotor core 3. Perform dynamic balancing tests on the rotor core 3. Step 4: Press-fit and remanufacture the rotor core 3, bearing 1 and shaft 7 into a rotor assembly; Step 5: Assemble the synchronous reluctance rotor assembly, the asynchronous motor stator assembly, and several accessories to obtain the self-starting synchronous reluctance motor and conduct testing.

[0026] A motor manufactured using the above-mentioned asynchronous motor remanufacturing self-starting synchronous reluctance motor method specifically includes two end covers 2, a stator assembly and a rotor assembly, wherein the rotor assembly is coaxially rotatably disposed inside the stator assembly; an end cover 2 is disposed at each end of the stator assembly; the end cover 2 and the rotor assembly are rotatably connected.

[0027] The stator assembly includes a housing 5 and a stator core 6. The stator core 6 is disposed on the inner wall of the housing 5, and a winding 4 is disposed on the stator core 6.

[0028] The rotor assembly includes a rotor core 3 and a rotating shaft 7. The rotor core 3 is coaxially sleeved on the rotating shaft 7, and the rotating shaft 7 and the end cover 2 are rotatably connected by a bearing 1.

[0029] The rotor core 3 includes several synchronous reluctance rotor laminations 301, several guide bars 10, and two end rings 8. The several synchronous reluctance rotor laminations 301 are stacked to form the core body. Several guide bars 10 are axially arranged on the core body, and an end ring 8 is provided at each end of the core body.

[0030] The synchronous reluctance rotor lamination 301 includes two rotor laminations 3011 and several rotor laminations 3012, with the latter sandwiched between the two rotor laminations 3011. Several rotor slots 11 are evenly arranged around the edges of the rotor laminations 3011 and 3012, and guide bars 10 are disposed within these slots. Several sets of air grid structures are evenly arranged around the inner circumference of the rotor slots 11 of the rotor laminations 3012. Each air grid structure includes several layers of air grids 9. The air grids 9 can be V-shaped, U-shaped, linear, or irregular multi-layered arc-shaped, but the number of poles corresponding to the air grids 9 must be consistent with the number of poles of the matching asynchronous motor stator core and windings. Each set of air grids 9 exhibits central symmetry. The size of the magnetic bridge at the edge of the air grids 9 must ensure the mechanical strength of the rotor core 3 at its highest operating speed and a low leakage flux coefficient.

[0031] The number of air grille layers 9, the thickness of each air grille layer 9, and the thickness of adjacent silicon steel sheet grilles can be flexibly adjusted. However, while maintaining mechanical strength, the ratio and difference between quadrature-axis inductance and direct-axis inductance should be maximized to achieve maximum reluctance torque output. A common approach is to use 3-4 layers of air grille layers 9. The number of air grille groups 9 needs to be the same as the number of stator poles of the remanufactured asynchronous motor.

[0032] In order to achieve sinusoidal air gap magnetic field, the synchronous reluctance rotor lamination 301 with air grille 9 can adopt a non-uniform air gap structure, that is, the outer circle of the synchronous reluctance rotor lamination 301 is designed as a wave-shaped structure.

[0033] The specific remanufacturing process of the asynchronous motor remanufacturing self-starting synchronous reluctance motor method described in this invention is as follows: In terms of specific operations, the main structural components of the asynchronous motor, such as the housing 5, shaft 7, end cover 2, and bearing 1, are retained. The stator core 6 and winding 4 are also retained. The main process involves disassembling the cast aluminum rotor core and replacing or remanufacturing it with a rotor core 3 made of synchronous reluctance rotor laminations 301 with a multi-layered air grid structure. The disassembled bearing 1 is then pressed back onto the shaft 7. The remanufactured synchronous reluctance motor rotor assembly is then assembled with the asynchronous motor stator assembly and accessories such as the end cover 2. After passing offline testing, a high-efficiency synchronous reluctance motor with self-starting capability is obtained. There are two methods for remanufacturing the cast aluminum rotor of the asynchronous motor. Method one involves directly replacing the original asynchronous motor rotor with a newly manufactured cast aluminum rotor with an air grid structure. The specific remanufacturing process is as follows... Figure 1 As shown. Method Two utilizes the original asynchronous motor's cast aluminum rotor material, and involves steps such as aluminum casting, core slicing, air grid punching, reluctance rotor stacking and guide bar end ring casting, dynamic balancing, and assembly of the reluctance rotor assembly and stator assembly. The specific remanufacturing process is as follows: Figure 2 As shown.

[0034] The remanufactured motor is a synchronous motor, and its operating speed is the synchronous speed corresponding to the power supply frequency. In actual operation, there is no rotor slip loss like that of an asynchronous motor, nor is there eddy current loss of the magnets in a permanent magnet motor. The rotor loss is approximately zero. Figure 3 and Figure 4 The diagram shows the internal structure of a traditional cast aluminum rotor asynchronous motor and the internal structure of a remanufactured synchronous reluctance motor. A comparison of the diagrams reveals that, apart from replacing the rotor core with a cast aluminum rotor, other structural components are reused to the greatest extent possible. Furthermore, the replaced rotor core 3 does not contain permanent magnets, copper, or aluminum; it only has a core made of stacked silicon steel sheets. Because the rotor core 3 rotates synchronously with the magnetic field, rotor iron loss is very low. Therefore, the requirements for the rotor silicon steel sheet core are very low; low-cost silicon steel sheets with a thickness of 0.5mm-1mm and higher losses can be used. If... Figure 2 The self-starting synchronous reluctance motor remanufacturing process shown is based on the original materials of the asynchronous motor, which effectively improves the recycling rate of the original asynchronous motor materials and significantly reduces the remanufacturing cost.

[0035] Figure 3 and Figure 4 The diagram shows the structure of a traditional asynchronous motor and the structure of a remanufactured synchronous reluctance motor with self-starting capability. Figure 12 The structure shown is an air grille stamping die, and the shaded mechanism in the figure is the air grille structure with raised surfaces. Figure 5 and Figure 6This is a traditional asynchronous motor with a cast aluminum rotor structure before remanufacturing. Figure 7 The rotor core and rotor lamination configuration (rotor lamination configuration 3011) is the rotor core and rotor lamination configuration after aluminum has been removed from the cast aluminum smelting process. Figure 9 For asynchronous motor laminations Figure 12 The diagram shows the structure of rotor lamination 3012 after stamping using the mold. Rotor lamination 3012 is then connected to... Figure 11 The rotor laminations 3011 shown are compositely stacked. The 99% of the laminations in the middle of the axial direction are made of rotor laminations 3012, and the 1% of the laminations at both ends of the axial direction are made of rotor laminations 3011. The purpose of this is to prevent molten aluminum from flowing into the air grid 9 during the rotor casting process. After the rotor laminations 3011 and 3012 are axially stacked, and then subjected to aluminum casting with guide bars 10 and end rings 8, as well as dynamic balancing, the remanufactured asynchronous motor self-starting synchronous reluctance motor rotor assembly can be obtained.

[0036] In summary, the asynchronous motor remanufacturing self-starting synchronous reluctance motor method and motor described in this invention operate at the synchronous speed corresponding to the power supply frequency. During actual operation, there is no rotor slip loss similar to that of an asynchronous motor, nor is there eddy current loss in the permanent magnet motor. The rotor loss is approximately zero, effectively improving motor efficiency by an average of 1-2 energy efficiency levels. Furthermore, because the rotor loss is approximately zero, rotor heating is greatly reduced. For high-speed operation, the problem of rotor heating limiting the overall power of the motor is solved, thereby further improving the continuous power of the motor.

[0037] The present invention discloses a method and motor for remanufacturing an asynchronous motor and creating a self-starting synchronous reluctance motor. This motor does not use a permanent magnet to provide the rotor magnetic field; instead, it utilizes the asymmetry between the quadrature and direct-axis magnetic circuits on the rotor side to achieve maximum torque output through the difference in quadrature and direct-axis inductance. Essentially, it is a synchronous reluctance motor. Furthermore, since the rotor has no permanent magnets and only silicon steel sheets, the motor cost is lower. The synchronous rotation of the silicon steel sheets eliminates core losses, allowing the use of silicon steel sheets with poor loss characteristics, thus reducing remanufacturing costs. Simultaneously, by preserving the stator assembly and shaft end caps to the greatest extent possible, system modification costs are further reduced. If the rotor laminations from the disassembled cast aluminum rotor core of the asynchronous motor are reprocessed, no additional high-performance electrical materials are needed. The original asynchronous motor rotor material is used, and the entire machine can be converted to synchronous reluctance after only secondary processing. The manufacturing costs involved in this process mainly include aluminum smelting and recasting, the punching of the air grille slots, and the stacking of the rotor core 3, further reducing the overall manufacturing cost.

[0038] The present invention discloses a method and motor for remanufacturing an asynchronous motor and starting a self-starting synchronous reluctance motor. The motor retains the squirrel-cage rotor structure, so no special frequency converter is required. Asynchronous start-up and synchronous operation can be achieved simply by relying on the power frequency grid. Furthermore, the rotor core 3 with air grilles punched out also has self-starting capability and can complete the start-up operation without the need for a special frequency converter or controller.

[0039] The present invention discloses a method and motor for remanufacturing an asynchronous motor and starting a self-starting synchronous reluctance motor. After the startup process, when the motor reaches stable operation, the torque output mainly relies on the difference between the quadrature axis and direct axis inductances and the saliency ratio. At this time, by optimizing the air grid structure, a greater torque output can be achieved. The maximum synchronous torque will be greater than the asynchronous torque. In other words, the asynchronous motor remanufactured by synchronous reluctance can obtain a greater overload capacity.

[0040] The specific embodiments described above further illustrate the purpose, technical solution, and beneficial effects of the present invention. It should be understood that the above descriptions are merely specific embodiments of the present invention and are not intended to limit the invention. They can also be reasonable combinations of the features described in the above embodiments. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A method for remanufacturing an asynchronous motor into a self-starting synchronous reluctance motor, characterized in that: Includes the following steps: Step 1: Disassemble the asynchronous motor to obtain the asynchronous motor rotor assembly, asynchronous motor stator assembly, and several accessories. Keep the asynchronous motor stator assembly and accessories. Step 2: Disassemble the asynchronous motor rotor assembly to obtain the cast aluminum rotor core, bearing (1) and shaft (7). Keep the bearing (1) and shaft (7) and disassemble and recycle the cast aluminum rotor core. Step 3: Manufacturing synchronous reluctance rotor laminations (301), wherein two synchronous reluctance rotor laminations (301) are provided with a number of rotor slots (11), and the remaining synchronous reluctance rotor laminations (301) are provided with a number of rotor slots (11) and a number of air grid structures; and stacking the synchronous reluctance rotor laminations (301) into shape. Step 4: Manufacture new guide bars (10) and end rings (8), and install them onto several synchronous reluctance rotor laminations (301) after stacking to form a rotor core (3). Perform dynamic balancing tests on the rotor core (3). Step 4: Press-fit and remanufacture the rotor core (3), bearing (1) and shaft (7) into a rotor assembly; Step 5: Assemble the synchronous reluctance rotor assembly, the asynchronous motor stator assembly, and several accessories to obtain the self-starting synchronous reluctance motor and conduct testing.

2. The method for remanufacturing an asynchronous motor into a self-starting synchronous reluctance motor according to claim 1, characterized in that: The guide bar (10) and end ring (8) in step three are made of metallic aluminum smelted from the cast aluminum rotor core.

3. The method for remanufacturing an asynchronous motor and starting a self-starting synchronous reluctance motor according to claim 1, characterized in that: The synchronous reluctance rotor lamination (301) in step three is obtained by stamping or remanufacturing the rotor lamination after disassembling the cast aluminum rotor core of the asynchronous motor.

4. A motor manufactured using the asynchronous motor remanufacturing self-starting synchronous reluctance motor method described in claim 1, characterized in that: It includes two end caps (2), a stator assembly and a rotor assembly. The rotor assembly is coaxially rotatably mounted inside the stator assembly. An end cap (2) is provided at each end of the stator assembly. The end caps (2) and the rotor assembly are rotatably connected.

5. The motor according to claim 4, characterized in that: The stator assembly includes a housing (5) and a stator core (6). The stator core (6) is disposed on the inner wall of the housing (5), and a winding (4) is disposed on the stator core (6).

6. The motor according to claim 4, characterized in that: The rotor assembly includes a rotor core (3) and a rotating shaft (7). The rotor core (3) is coaxially mounted on the rotating shaft (7), and the rotating shaft (7) and the end cover (2) are rotatably connected.

7. The motor according to claim 6, characterized in that: The rotor core (3) includes several synchronous reluctance rotor laminations (301), several guide bars (10) and two end rings (8). Several synchronous reluctance rotor laminations (301) are stacked to form the core body. Several guide bars (10) are axially arranged on the core body. An end ring (8) is provided at each end of the core body.

8. The motor according to claim 6, characterized in that: The synchronous reluctance rotor lamination (301) includes two rotor laminations (3011) and several rotor laminations (3012), with the several rotor laminations (3012) sandwiched between the two rotor laminations (3011); several rotor slots (11) are uniformly arranged around the edges of the rotor laminations (3011) and the rotor laminations (3012); several sets of air grid structures are uniformly arranged around the inner circumference of the rotor slots (11) of the rotor laminations (3012); the air grid structure includes several layers of air grids (9).

9. The motor according to claim 8, characterized in that: The outer circle of the synchronous reluctance rotor lamination (301) has a wave-shaped structure.

10. The motor according to claim 6, characterized in that: The shaft (7) and the end cap (2) are connected by a bearing (1).

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