Method for assembling rotor laminations and rotor cores for four types of electric machines

Abstract

The present application relates to the technical field of motor design and manufacturing, and discloses a rotor punching sheet and an assembling method of a rotor core suitable for four types of motors respectively. The rotor punching sheet is disc-shaped and is formed with an axle hole, a plug hole and a magnetic resistance slot. The axle hole is located at the axle center of the rotor punching sheet. The plug hole penetrates the rotor punching sheet along the thickness direction. The plug hole is close to the edge of the rotor punching sheet and is uniformly arranged along the circumference. The magnetic resistance slot penetrates the rotor punching sheet along the thickness direction and is arranged in a staggered manner with the plug hole. The magnetic resistance slot is uniformly and symmetrically arranged along the circumferential direction of the rotor punching sheet. Thus, the punching sheet die of the four types of motors can be shared, the die cost is reduced, and the economic benefit of the product is improved.

Description

Technical Field

[0001] This invention relates to the field of motor design and manufacturing technology, and in particular to an assembly method for rotor laminations and rotor cores applicable to four different types of motors. Background Technology

[0002] As electric motors have evolved to the point where there are many different types, they play important roles in various fields and have become an indispensable part of production and technological development.

[0003] Synchronous reluctance motors, speed-regulating permanent magnet synchronous motors, and traditional asynchronous starting permanent magnet synchronous motors are widely used in various application fields due to their respective advantages such as high efficiency and high power density. However, the rotor structures of these motors differ significantly. For example, the core of a synchronous reluctance motor rotor is a multi-layered air magnetic barrier without conductor bars or permanent magnets; a self-starting synchronous reluctance motor rotor integrates squirrel-cage conductor bars into the magnetic barrier structure to meet direct starting requirements; speed-regulating permanent magnet synchronous motor rotors typically refer to embedded permanent magnet motors, containing permanent magnet slots and permanent magnets, and usually without starting conductor bars; a self-starting permanent magnet synchronous motor rotor adds squirrel-cage conductor bars to the permanent magnet motor rotor to achieve asynchronous starting.

[0004] To produce the four types of motors mentioned above, the traditional solution requires the design of four different rotor lamination dies, which has poor versatility. This results in problems such as long product development cycles, high die costs, complex production management, and high inventory pressure, leading to low economic benefits and severely restricting the flexibility of the product line and the speed of market response. Summary of the Invention

[0005] The main objective of this invention is to provide a rotor lamination that enables the use of lamination dies for four types of motors, thereby reducing die costs and improving product economic efficiency.

[0006] To achieve the above objectives, the rotor laminations proposed in this invention are arranged in a disk shape and have shaft holes, insertion holes, and magnetic reluctance grooves.

[0007] The shaft hole is located at the center of the rotor lamination; The insertion hole extends through the rotor lamination along the thickness direction, and the insertion hole is close to the edge of the rotor lamination and is evenly distributed in a circular pattern. The magnetic resistance groove extends through the rotor lamination along the thickness direction and is offset from the insertion hole. The magnetic resistance groove is evenly and symmetrically arranged along the circumference of the rotor lamination.

[0008] In one embodiment, the insertion hole is a round hole.

[0009] In one embodiment, the magnetoresistive groove is arranged in a U-shape and / or a V-shape.

[0010] In one embodiment, the magnetic reluctance grooves are arranged in layers from the inside to the outside along the radial direction of the rotor laminations, and the ends of the magnetic reluctance grooves are located between the insertion holes.

[0011] This invention also proposes an assembly method for rotor cores applicable to four different motor types. The method uses the rotor laminations to assemble rotor cores suitable for each of the four motor types. The assembly method includes the following steps: Multiple rotor laminations are stacked to form a lamination group; Different accessories are assembled into the laminations according to the type of motor to obtain rotor cores suitable for different types of motors.

[0012] In one embodiment, the step of stacking multiple rotor laminations to form a lamination group includes: Take multiple rotor laminations; The rotor laminations are stacked along the thickness direction of the rotor laminations; Adjust the relative angle of each rotor lamination so that the shaft hole, insertion hole and magnetic reluctance groove of each rotor lamination are aligned. Each rotor lamination is fixed to form the lamination group.

[0013] In one embodiment, the step of assembling different accessories according to the type of applicable motor to obtain a rotor core suitable for different types of motors includes: If a synchronous reluctance motor is applicable; Silicon steel rods were selected as the aforementioned accessories; The silicon steel rod is inserted into the socket of the lamination assembly and fixed to obtain a rotor core suitable for the synchronous reluctance motor.

[0014] In one embodiment, the step of assembling different accessories according to the type of applicable motor to obtain a rotor core suitable for different types of motors includes: If a self-starting synchronous reluctance motor is applicable; Aluminum end rings and aluminum rods were selected as the aforementioned accessories; Aluminum end rings and aluminum rods were selected as the aforementioned accessories; The aluminum rods are respectively assembled into the insertion holes of the lamination assembly and fixed. The aluminum end ring is passed through the end of the aluminum rod and assembled at both ends of the lamination assembly; The aluminum end ring is welded and fixed to the aluminum rod to obtain a rotor core suitable for the self-starting synchronous reluctance motor.

[0015] In one embodiment, the step of assembling different accessories according to the type of applicable motor to obtain a rotor core suitable for different types of motors includes: If a speed-regulating permanent magnet synchronous motor is applicable; Silicon steel rods and permanent magnets were selected as the aforementioned accessories; Insert the silicon steel rod into the insertion hole of the lamination assembly and fix it in place; The permanent magnet is inserted into the magnetic reluctance groove of the lamination assembly and fixed to obtain a rotor core suitable for the speed-regulating permanent magnet synchronous motor.

[0016] In one embodiment, the step of assembling different accessories according to the type of applicable motor to obtain a rotor core suitable for different types of motors includes: If a self-starting permanent magnet synchronous motor is applicable; Aluminum rods, aluminum end rings, and permanent magnets are selected as the aforementioned accessories; Insert the permanent magnet into the magnetic resistance groove of the lamination assembly and fix it in place; The aluminum end rings are respectively assembled at both ends of the lamination assembly; Adjust the through hole of the aluminum end ring to be aligned with the insertion hole of the lamination assembly, and weld and fix the aluminum end ring and the lamination assembly. The aluminum rod is passed through the through hole and the insertion hole and welded to the two aluminum end rings to obtain a rotor core suitable for the self-starting permanent magnet synchronous motor.

[0017] In the technical solution of this invention, insertion holes are provided on the rotor laminations to replace the guide bar slots provided on the traditional rotor laminations. Magnetic reluctance slots are used as the magnetic reluctance slots or permanent magnet slots of the traditional rotor laminations. Depending on whether the material of the rod inserted into the insertion hole is silicon steel or aluminum, and whether a permanent magnet is inserted into the magnetic reluctance slot, the laminations are stacked to form rotor cores for four types of motors: synchronous reluctance motors, self-starting synchronous reluctance motors, speed-regulating permanent magnet synchronous motors, and self-starting permanent magnet synchronous motors. Specifically, after the rotor laminations are stacked: inserting silicon steel rods into the insertion holes is equivalent to filling the insertion holes with the same material as the rotor laminations. The resulting rotor core can be used for synchronous reluctance motors. Further inserting permanent magnets into the magnetic reluctance slots results in a rotor core that can be used for speed-regulating permanent magnet synchronous motors. Inserting aluminum rods into the insertion holes as starting guide bars, used in conjunction with aluminum end rings, results in a rotor core that can be used for self-starting synchronous reluctance motors. Inserting permanent magnets into the magnetic reluctance slots before setting the aluminum end rings results in a rotor core that can be used for self-starting permanent magnet synchronous motors. The rotor laminations proposed in this solution can be stacked and then assembled with different accessories to form rotor cores for the four different types of motors mentioned above. This allows for the sharing of lamination molds for the four types of motors, reducing mold costs and improving product economic efficiency. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, 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 the present invention. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of the structure of an embodiment of the rotor lamination provided by the present invention; Figure 2 The diagram illustrates the steps of the assembly method for rotor cores applicable to four types of motors provided by the present invention.

[0020] Explanation of icon numbers: 100. Rotor laminations; 1. Shaft hole; 2. Insertion hole; 3. Magnetic reluctance groove.

[0021] The realization of the objective, functional features and advantages of the present invention will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0022] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0023] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present invention are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indication will also change accordingly.

[0024] Furthermore, the use of terms such as "first" and "second" in this invention is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature. Additionally, the technical solutions of the various embodiments can be combined with each other, but only on the basis of being achievable by those skilled in the art. When the combination of technical solutions is contradictory or impossible to implement, such a combination of technical solutions should be considered non-existent and not within the scope of protection claimed by this invention.

[0025] This invention proposes a rotor lamination 100, Figure 1 This is one embodiment of the present invention.

[0026] In this embodiment of the invention, the rotor lamination 100 is arranged in a disk shape and has a shaft hole 1, an insertion hole 2 and a magnetic resistance groove 3. The shaft hole 1 is located at the axis of the rotor lamination 100. The insertion hole 2 penetrates the rotor lamination 100 along the thickness direction. The insertion hole 2 is close to the edge of the rotor lamination 100 and is evenly distributed around the circumference. The magnetic resistance groove 3 penetrates the rotor lamination 100 along the thickness direction and is offset from the insertion hole 2. The magnetic resistance groove 3 is evenly and symmetrically distributed around the circumference of the rotor lamination 100.

[0027] In the technical solution of this invention, insertion holes 2 are provided on the rotor lamination 100 to replace the guide bar grooves provided on the traditional rotor lamination 100. Magnetic reluctance grooves 3 are used as the magnetic reluctance grooves 3 or permanent magnet grooves of the traditional laminations. Depending on whether the material of the bar inserted into the insertion hole 2 is silicon steel or aluminum, and whether a permanent magnet is inserted into the magnetic reluctance groove 3, the laminations are stacked to form rotor cores for four types of motors: synchronous reluctance motors, self-starting synchronous reluctance motors, speed-regulating permanent magnet synchronous motors, and self-starting permanent magnet synchronous motors. Specifically, after the rotor laminations 100 are stacked: A silicon steel rod is inserted into socket 2, which is equivalent to filling socket 2 with the same material as the rotor lamination 100. The resulting rotor core can be used in a synchronous reluctance motor. Further insertion of a permanent magnet into the reluctance slot 3 results in a rotor core suitable for a speed-regulating permanent magnet synchronous motor. Alternatively, an aluminum rod can be inserted into socket 2 as a starting guide bar, used in conjunction with an aluminum end ring. This results in a rotor core suitable for a self-starting synchronous reluctance motor. Inserting a permanent magnet into the reluctance slot 3 before setting the aluminum end ring also results in a rotor core suitable for a self-starting permanent magnet synchronous motor. The rotor lamination 100 proposed in this solution only requires different accessories to be assembled after stacking to form rotor cores for the four different types of motors mentioned above. Therefore, this solution achieves the sharing of lamination molds for four types of motors, reducing mold costs and improving product economic efficiency.

[0028] Among them, the manufacturing processes of silicon steel rods, aluminum rods, permanent magnets and aluminum end rings are very mature. Silicon steel rods are formed by stacking silicon steel sheets. When applied to different motor parameters, the specific dimensional parameters of rotor laminations 100, silicon steel rods, aluminum rods, permanent magnets and aluminum end rings can be designed accordingly.

[0029] The quantity of socket 2 and magnetoresistive slot 3 is not limited, provided that the positional relationship defined in this scheme is satisfied. Figure 1 As shown, in one embodiment, the number of sockets 2 is 20, and the number of magnetoresistive slots 3 is eight, including four larger slots and four smaller slots, and the specific arrangement is as shown in the figure.

[0030] The shape of the insertion hole 2 is not limited. In one embodiment, the insertion hole 2 is a circular hole. The circular hole structure has a more mature processing technology, and the stamping accuracy is easier to guarantee. It can also simplify the structure of the lamination die, reduce the difficulty of die processing and production costs. In addition, the inner wall of the circular hole is subjected to uniform stress, which can improve the coaxiality and assembly smoothness when inserting silicon steel rods and aluminum rods. It avoids the problems of assembly jamming and stress concentration that are easy to occur when using irregularly shaped holes. At the same time, it ensures the stable installation of rods of different materials, further enhances the universal adaptability of rotor lamination 100 to various rod materials, and ensures the assembly quality and operational reliability of the universal rotor core.

[0031] In one embodiment, the reluctance slots 3 are arranged in a U-shape, a V-shape, or a combination of U-shapes and V-shapes. The U-shape and V-shape slots can precisely construct the d / q-axis reluctance difference required by the motor, serving as both the magnetic barrier structure for synchronous reluctance motors and the permanent magnet mounting slots for permanent magnet synchronous motors. This perfectly adapts to the magnetic circuits and assembly requirements of four types of motors. Furthermore, the symmetrical slot design results in smooth magnetic flux changes, effectively reducing torque pulsation, vibration, and noise. Simultaneously, this slot design offers excellent stamping processability and facilitates mass production, optimizing magnetic performance while also considering rotor structural strength and manufacturing feasibility. When using a combination of U-shapes and V-shapes, it is necessary to ensure that the reluctance slots 3 of different shapes are uniformly and symmetrically arranged axially on the rotor laminations 100.

[0032] In one embodiment, the magnetic reluctance slots 3 are arranged in layers from the inside to the outside along the radial direction of the rotor lamination 100. The multiple layers of magnetic reluctance slots 3 are circumferentially uniform and symmetrical, and the magnetic bridge structure formed by silicon steel sheets can be retained between the layers and staggered with the socket 2. The radial layered arrangement can significantly increase the magnetic reluctance difference between the d and q axes, improve the motor torque density and operating efficiency. The magnetic bridges between the layers can not only ensure the smooth magnetic circuit of the d axis, but also significantly enhance the mechanical strength of the rotor core, adapting to the high-speed operation of the motor. At the same time, the layered structure can flexibly adapt to the design requirements of motors with different power levels without destroying the layout logic of the socket 2 and the magnetic reluctance slots 3, continuing the core advantage of the universality of the rotor lamination 100, and further expanding the applicability and performance limit of the four types of motors.

[0033] In one embodiment, the ends of the magnetic reluctance grooves 3 are distributed between the insertion holes 2 and are located near the edge of the lamination rotor 100 to form a narrow magnetic bridge, thereby improving the balance between electromagnetic performance and ensuring mechanical reliability.

[0034] The d-axis is perpendicular to the q-axis. The d-axis is the center line of the motor rotor magnetic poles, and the q-axis is located at the midpoint between two adjacent magnetic poles of the motor rotor.

[0035] This invention also proposes an assembly method for rotor cores applicable to four types of motors, using rotor laminations 100 to assemble rotor cores suitable for each of the four types of motors, combined with... Figure 1 and Figure 2 The assembly method is as follows: First, take multiple rotor laminations 100 of the same specification and stack them axially along the thickness direction. During stacking, the relative angles of each lamination must be precisely adjusted to ensure that the shaft holes 1, insertion holes 2, and magnetic reluctance grooves 3 of all laminations are perfectly aligned. This avoids misalignment that could prevent the assembly of subsequent parts or cause rotor eccentricity and abnormal operation after assembly. The shaft hole 1 serves as the reference for rotor rotation, the insertion hole 2 is used to assemble the bar stock, and the magnetic reluctance groove 3 is used to construct magnetic barriers or install permanent magnets. After adjustment, fix the laminations by welding, overlapping, or potting to form a structurally stable and dimensionally accurate lamination assembly. This lamination assembly serves as a universal basic frame for the rotor cores of four types of motors, eliminating the need to manufacture separate lamination assemblies for different motors. This achieves mold sharing from the source and simplifies the production process.

[0036] Subsequently, based on the type of motor to be adapted, the corresponding accessories are selected and differentiated assembly is completed: When adapting to a synchronous reluctance motor, only silicon steel rods are selected as accessories. The silicon steel rods are inserted into the socket 2 of the lamination assembly and fixed. By utilizing the characteristic that the silicon steel rods and rotor laminations 100 are made of the same material, the magnetic circuit of the d-axis is ensured to be unobstructed. The reluctance slots 3 are kept hollow as air magnetic barriers, forming a rotor core with a pure reluctance structure.

[0037] When adapting to a self-starting synchronous reluctance motor, aluminum rods and aluminum end rings are selected as accessories. First, insert the aluminum rod into the insertion hole 2 and leave a certain length at both ends. Then, align the through holes of the aluminum end rings with the aluminum rods and pass them through the ends of the aluminum rods to assemble the aluminum end rings at both ends of the lamination assembly axially. Weld the aluminum rods and the aluminum end rings at both ends to form a complete squirrel cage structure. This retains the air magnetic barrier of the reluctance slot 3 to achieve efficient operation, while also meeting the direct starting requirements of the motor through the squirrel cage structure.

[0038] When adapting to a speed-regulating permanent magnet synchronous motor, silicon steel rods and permanent magnets are selected as accessories. First, the silicon steel rods are inserted into the socket 2 and fixed to ensure the magnetic circuit is regular. Then, the permanent magnets are inserted into the magnetic reluctance groove 3 and fixed. At this time, the magnetic reluctance groove 3 serves as the permanent magnet mounting groove. The permanent magnets provide a stable magnetic field, and the silicon steel rods are used to optimize the magnetic circuit to form a high power density, variable frequency speed-regulating rotor core.

[0039] When adapting to a self-starting permanent magnet synchronous motor, aluminum rods, aluminum end rings, and permanent magnets are selected as accessories. First, the permanent magnets are inserted into the magnetic reluctance groove 3 and fixed to build a permanent magnet magnetic field. Then, the aluminum end rings are assembled and welded. Finally, the aluminum rods are inserted and welded to the aluminum end rings to form a squirrel cage structure, which takes into account both the high efficiency of the permanent magnet motor and the self-starting capability of the asynchronous motor.

[0040] The assembly of the above four types of motors differs only in the selection of accessories and a few assembly steps. The lamination assembly is universal throughout, which can effectively reduce mold costs, shorten the R&D cycle, reduce inventory pressure and production management difficulty.

[0041] In a specific production scenario: To manufacture a series of motors with a power of 15kW, four types of rotor cores adapted to this power need to be made simultaneously. First, 600 non-oriented silicon steel rotor laminations of 0.35mm thickness are uniformly taken, stacked, aligned, and fixed by laser welding at both ends to form a lamination group with a length of 90mm. When manufacturing the synchronous reluctance motor rotor, 20 φ4mm silicon steel rods are inserted and pressed and fixed. When manufacturing the self-starting synchronous reluctance motor rotor, circular aluminum end rings are assembled at both ends of the lamination group, and the 20 through holes on the end rings are adjusted to align with the laminations. The insertion holes 2 are aligned and welded together, and then 20 φ4mm aluminum rods are inserted. The two ends of the aluminum rods are welded to the aluminum end rings to form a squirrel cage. When making the rotor of the speed-regulating permanent magnet synchronous motor, the silicon steel rods mentioned above are first inserted and fixed, and then neodymium iron boron permanent magnets are inserted into the V-shaped magnetic reluctance groove 3 and fixed with glue. When making the rotor of the self-starting permanent magnet synchronous motor, the permanent magnets are first fixed in the magnetic reluctance groove 3, and then the aluminum end rings are assembled and welded, and the aluminum rods are inserted and welded. Finally, by combining the same lamination group and different accessories, four types of motor rotor cores suitable for different scenarios can be quickly obtained, which greatly improves production efficiency and economic benefits.

[0042] The assembly method of rotor cores applicable to four types of motors provided by the present invention uses the above-mentioned rotor cores as the basis. Therefore, it includes all the technical solutions of the above-mentioned rotor cores and also has all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be described in detail here.

[0043] The above description is merely a preferred embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural transformations made using the contents of the present invention's specification and drawings under the inventive concept of the present invention, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present invention.

Claims

1. A rotor lamination for use in the rotor core of an electric motor, characterized in that, The rotor laminations are arranged in a disc shape and have shaft holes, insertion holes and magnetic reluctance grooves. The shaft hole is located at the center of the rotor lamination; The insertion hole extends through the rotor lamination along the thickness direction, and the insertion hole is close to the edge of the rotor lamination and is evenly distributed in a circular pattern. The magnetic resistance groove extends through the rotor lamination along the thickness direction and is offset from the insertion hole. The magnetic resistance groove is evenly and symmetrically arranged along the circumference of the rotor lamination.

2. The rotor lamination as described in claim 1, characterized in that, The insertion hole is a round hole.

3. The rotor lamination as described in claim 1, characterized in that, The magnetoresistive groove is arranged in a U-shape and / or a V-shape.

4. The rotor lamination as described in claim 1, characterized in that, The magnetic reluctance grooves are arranged in layers from the inside to the outside along the radial direction of the rotor laminations, and the ends of the magnetic reluctance grooves are located between the insertion holes.

5. A method for assembling rotor cores applicable to four types of motors, characterized in that, Using rotor laminations as described in any one of claims 1 to 4, rotor cores suitable for four types of motors are assembled, the assembly method comprising the following steps: Multiple rotor laminations are stacked to form a lamination group; Different accessories are assembled into the laminations according to the type of motor to obtain rotor cores suitable for different types of motors.

6. The assembly method for rotor cores applicable to four types of motors as described in claim 5, characterized in that, The step of stacking multiple rotor laminations to form a lamination group includes: Take multiple rotor laminations; The rotor laminations are stacked along the thickness direction of the rotor laminations; Adjust the relative angle of each rotor lamination so that the shaft hole, insertion hole and magnetic reluctance groove of each rotor lamination are aligned. Each rotor lamination is fixed to form the lamination group.

7. The assembly method for rotor cores applicable to four types of motors as described in claim 5, characterized in that, The step of assembling different accessories according to the type of applicable motor to obtain a rotor core suitable for different types of motors includes: If a synchronous reluctance motor is applicable; Silicon steel rods were selected as the aforementioned accessories; The silicon steel rod is inserted into the socket of the lamination assembly and fixed to obtain a rotor core suitable for the synchronous reluctance motor.

8. The assembly method for rotor cores applicable to four types of motors as described in claim 5, characterized in that, The step of assembling different accessories according to the type of applicable motor to obtain a rotor core suitable for different types of motors includes: If a self-starting synchronous reluctance motor is applicable; Aluminum end rings and aluminum rods were selected as the aforementioned accessories; The aluminum rods are respectively assembled into the insertion holes of the lamination assembly and fixed. The aluminum end ring is passed through the end of the aluminum rod and assembled at both ends of the lamination assembly; The aluminum end ring is welded and fixed to the aluminum rod to obtain a rotor core suitable for the self-starting synchronous reluctance motor.

9. The assembly method for rotor cores applicable to four types of motors as described in claim 5, characterized in that, The step of assembling different accessories according to the type of applicable motor to obtain a rotor core suitable for different types of motors includes: If a speed-regulating permanent magnet synchronous motor is applicable; Silicon steel rods and permanent magnets were selected as the aforementioned accessories; Insert the silicon steel rod into the insertion hole of the lamination assembly and fix it in place; The permanent magnet is inserted into the magnetic reluctance groove of the lamination assembly and fixed to obtain a rotor core suitable for the speed-regulating permanent magnet synchronous motor.

10. The assembly method for rotor cores applicable to four types of motors as described in claim 5, characterized in that, The step of assembling different accessories according to the type of applicable motor to obtain a rotor core suitable for different types of motors includes: If a self-starting permanent magnet synchronous motor is applicable; Aluminum rods, aluminum end rings, and permanent magnets are selected as the aforementioned accessories; Insert the permanent magnet into the magnetic resistance groove of the lamination assembly and fix it in place; The aluminum end rings are respectively assembled at both ends of the lamination assembly; Adjust the through hole of the aluminum end ring to be aligned with the insertion hole of the lamination assembly, and weld and fix the aluminum end ring and the lamination assembly. The aluminum rod is passed through the through hole and the insertion hole and welded to the two aluminum end rings to obtain a rotor core suitable for the self-starting permanent magnet synchronous motor.

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