A remanufactured motor with unequal air gap saddle pole structure and a manufacturing method thereof

Abstract

The present invention provides a remanufactured motor with an unequal air gap saddle pole structure and a manufacturing method. By removing part of the rotor cage, the cross-sectional area of ​​the cage is reduced, and the resistance of the cage winding is improved, so that the modified induction motor can generate a higher starting torque than the original induction motor, and the permanent magnet is installed in the rotor space released by removing part of the rotor cage, so that the motor can generate sufficient air gap magnetic field energy during operation, and by removing part of the outer peripheral surface of the rotor, the rotor is made into an unequal air gap structure, reducing the harmonic content of the motor back electromotive force and the cogging torque to meet the operation needs of the motor. Compared with the new permanent magnet synchronous motor, this design is based on the upgraded remanufacturing of the old motor, and the price is relatively lower than the new motor. Compared with the existing motor remanufacturing, the present invention does not need to match the inverter to start, and there will be no permanent magnet shedding phenomenon, and the structure is more stable.

Description

Technical Field

[0001] The invention relates to the field of three-phase asynchronous motor reconstruction, and in particular to a remanufactured motor with an unequal air gap saddle pole structure and a manufacturing method thereof. Background Art

[0002] According to statistics, in 2015, the total power consumption of motors in my country accounted for about 65% of the total power consumption of the whole society. The energy consumption of motors is so large, but the overall energy efficiency level of domestic motors is still low. At present, a large number of low-efficiency induction motors such as Y and YB series are retained in the motor market in my country. If high-efficiency motors are directly used for replacement, on the one hand, the cost of high-efficiency motors is high, and the cost that enterprises need to pay is difficult to recover in a short time. On the other hand, the disposal of discarded waste motors will bring great environmental pollution problems. In the existing technology, remanufacturing is generally used to improve the energy-saving benefits of low-efficiency motors, that is, to improve the internal structure of the motor, so as to improve the energy efficiency level of the motor. The most common way is to replace the silicon steel sheet on the rotor with amorphous materials, so as to achieve the purpose of improving energy efficiency to a certain extent; another way is to attach permanent magnets on the rotor surface or remanufacture the motor by replacing the original motor rotor.

[0003] However, the preparation cost of amorphous materials is high, the processing conditions are harsh, and they are easy to denature when used at high temperatures. Therefore, replacing the silicon steel sheets on the rotor with amorphous materials cannot be widely used. In the method of attaching permanent magnets on the rotor surface, the permanent magnets are easy to fall off and need to be equipped with a frequency converter, so it is not suitable for widespread application. Remanufacturing the motor by replacing the rotor not only wastes resources, but also has high costs for processing and preparing the new rotor. At the same time, the existing rotor modification does not consider optimizing the air gap magnetic field, so it is impossible to optimize the harmonic amount of the generated potential, so it is not suitable for widespread application. Summary of the invention

[0004] In view of this, an embodiment of the present invention provides a remanufactured motor and a manufacturing method with an unequal air gap saddle pole structure to solve the problems of high preparation cost and difficulty in amorphous processing of amorphous materials when replacing silicon steel sheets on the rotor with amorphous materials in the prior art; the problem that permanent magnets are easy to fall off when affixed to the rotor surface in the prior art; and the problem that the air gap magnetic field optimization is not considered during the transformation, resulting in the inability to optimize the harmonic amount of the generated potential.

[0005] To achieve the above objectives, the embodiments of the present invention provide the following technical solutions:

[0006] The first aspect of the present invention discloses a method for manufacturing a remanufactured motor having an unequal air gap saddle pole structure, comprising:

[0007] Remove part of the rotor cage to free up some rotor space;

[0008] Installing a permanent magnet in the rotor space;

[0009] Part of the outer circumference of the rotor is removed to make the rotor have an unequal air gap structure.

[0010] Preferably, removing part of the rotor cage to release a certain rotor space includes:

[0011] A through saddle groove is cut with the rotor axis as the center line. The through saddle groove includes a middle groove and two side grooves. The middle groove and the two side grooves form a saddle shape with an opening facing the rotor axis.

[0012] Preferably, there are multiple through saddle grooves, and the multiple through saddle grooves are evenly distributed along the circumferential direction of the rotor.

[0013] Preferably, the middle groove running through the saddle groove has a length of 60.47 mm and a width of 6.7 mm.

[0014] Preferably, the permanent magnet is a magnet group, and each magnet group has four magnets installed in parallel along the axial direction of the rotor in the through saddle slot.

[0015] Preferably, removing part of the outer circumferential surface of the rotor to make the rotor into an unequal air gap structure comprises:

[0016] Part of the outer circumference of the rotor is removed to form an eccentric circle on the outer circumference of the rotor, and the eccentric circle is aligned with the through saddle groove.

[0017] Preferably, the center of the eccentric circle is offset radially outward by 9.82 mm from the center of the rotor, and the radius of the eccentric circle is 74.48 mm.

[0018] Preferably, after removing part of the outer circumference of the rotor so that the rotor has an unequal air gap structure, the method further includes:

[0019] The outer circumference of the rotor is covered with a magnetic isolation sleeve.

[0020] Preferably, after covering the outer circumference of the rotor with a magnetic isolation sleeve, the method further includes:

[0021] The remanufactured rotor is installed with other parts of the motor.

[0022] The second aspect of the present invention discloses a remanufactured motor with an unequal air gap saddle pole structure, which is a remanufactured motor with an unequal air gap saddle pole structure manufactured according to the manufacturing method disclosed in the first aspect of the present invention.

[0023] From the above content, it can be known that the present invention discloses a remanufactured motor and manufacturing method with an unequal air gap saddle pole structure. First, a certain rotor space is released by removing part of the rotor cage; then permanent magnets are installed in the rotor space, and finally part of the outer peripheral surface of the rotor is removed to make the rotor into an unequal air gap structure. Compared with the new permanent magnet synchronous motor, this design is based on the upgraded remanufacturing of the old motor, so the price of the motor is much lower than that of the new motor, and the added value of the old motor can be well utilized. Compared with the existing motor remanufacturing method, the patent of the present invention does not need to match the inverter for starting, and the permanent magnet will not fall off. At the same time, while ensuring the stability of the structure, the original motor parts can be retained to the greatest extent to achieve high-value recycling of waste motors. At the same time, through the above-disclosed manufacturing method, part of the rotor cage is removed, so that the cage cross-sectional area is reduced and the cage winding resistance is improved, so that the modified induction motor can generate a higher starting torque than the original induction motor, and the permanent magnet is installed in the rotor space released by removing part of the rotor cage, so that the motor can generate sufficient air gap magnetic field energy during operation, and by removing part of the outer peripheral surface of the rotor, the rotor becomes an unequal air gap structure, reducing the harmonic content of the motor back electromotive force and the cogging torque to meet the needs of motor operation. The topological structure design of the motor rotor in this scheme reconstructs the design theory of the "cage" of the induction motor. When the permanent magnet is remanufactured, the starting function and the running function of the cage of the original induction motor are "decoupled" on an originally unified cage, and only the starting function is retained. Therefore, part of the cage can be removed to solve the contradiction between the starting cage and the permanent magnetic poles of the "self-starting permanent magnet motor" in the rotor space arrangement. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[0025] Figure 1 A flow chart of a method for manufacturing a remanufactured motor having an unequal air gap saddle pole structure provided by an embodiment of the present invention;

[0026] Figure 2 A schematic diagram of a rotor structure with unequal air gaps after removing part of the squirrel cage provided in an embodiment of the present invention;

[0027] Figure 3 A schematic diagram of a rotor structure equipped with permanent magnets provided in an embodiment of the present invention;

[0028] Figure 4A spatial distribution diagram of magnetic steel in a saddle groove provided by an embodiment of the present invention;

[0029] Figure 5 A schematic diagram of the rotor structure after adding a magnetic isolation sleeve according to an embodiment of the present invention;

[0030] Figure 6 A distribution diagram of the motor magnetic lines of force in the motor performance analysis provided by an embodiment of the present invention;

[0031] Figure 7 An induced potential curve diagram in the motor performance analysis provided by an embodiment of the present invention;

[0032] Figure 8 A torque curve diagram in the motor performance analysis provided by an embodiment of the present invention;

[0033] Fig. 9 A curve diagram of speed variation over time in motor performance analysis provided in an embodiment of the present invention.

[0034] Among them, the rotor 10 runs through the saddle slot 20, the middle slot 21, the side slot 22, the magnetic steel 30, the middle magnet 31, the side magnet 32, and the magnetic isolation sleeve 40. DETAILED DESCRIPTION

[0035] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0036] In this application, the terms "comprises", "comprising" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element defined by the sentence "comprising a ..." does not exclude the presence of other identical elements in the process, method, article or device comprising the element.

[0037] The embodiment of the present invention provides a method for manufacturing a remanufactured motor having an unequal air gap saddle pole structure, see Figures 1 to 3 , Figure 1 The present invention is a flow chart of a method for manufacturing a remanufactured motor having an unequal air gap saddle pole structure, wherein the method for manufacturing a remanufactured motor having an unequal air gap saddle pole structure comprises at least the following steps:

[0038] S1. Remove part of the rotor cage to release a certain amount of rotor space;

[0039] S2. Installing permanent magnets in the rotor space.

[0040] S3. removing part of the outer circumference of the rotor so that the rotor has an unequal air gap structure.

[0041] It should be noted that in step S1, reference Figure 2 On the induction motor rotor 10, by considering the cross-sectional area of ​​the rotor 10 and removing part of the original squirrel cage along the axial direction of the rotor 10, a certain space of the rotor 10 is released. When the cross-sectional area of ​​the squirrel cage is reduced, the resistance of the squirrel cage winding is correspondingly increased, so that the modified induction motor can generate a higher starting torque than the original induction motor.

[0042] In step S2, referring to Figure 3 By installing the permanent magnet 30 in the space of the rotor 10, the motor can generate sufficient air gap magnetic field energy during operation, thereby meeting the motor operation requirements.

[0043] In step S3, by removing part of the outer circumference of the rotor 10 so that the rotor 10 has an unequal air gap structure, the back electromotive force harmonic content and the cogging torque of the motor can be reduced.

[0044] It should also be noted that when executing step S3, it can be executed before executing step S1, or it can be executed after executing step S1 and before step S2. The above execution steps are only for illustration. Therefore, executing step S3 is not necessarily executed after executing step S2.

[0045] The manufacturing method of the remanufactured motor with unequal air gap saddle pole structure provided by the embodiment of the present invention first releases a certain rotor space by removing part of the rotor cage; then installs permanent magnets in the rotor space, and finally removes part of the outer peripheral surface of the rotor to make the rotor into an unequal air gap structure. Compared with the new permanent magnet synchronous motor, this design is based on the upgraded remanufacturing of the old motor, so the price of the motor is much lower than that of the new motor, and the added value of the old motor can be well utilized. Compared with the existing motor remanufacturing method, the patent of the present invention does not need to match the inverter for starting, and the permanent magnet will not fall off. At the same time, while ensuring the stability of the structure, the original motor parts can be retained to the greatest extent to achieve high-value recycling of waste motors. At the same time, through the above-disclosed manufacturing method, part of the rotor cage is removed, so that the cage cross-sectional area is reduced and the cage winding resistance is improved, so that the modified induction motor can generate a higher starting torque than the original induction motor, and the permanent magnet is installed in the rotor space released by removing part of the rotor cage, so that the motor can generate sufficient air gap magnetic field energy during operation, and by removing part of the outer peripheral surface of the rotor, the rotor becomes an unequal air gap structure, reducing the harmonic content of the motor back electromotive force and the cogging torque to meet the needs of motor operation. The topological structure design of the motor rotor in this scheme reconstructs the design theory of the "cage" of the induction motor. When the permanent magnet is remanufactured, the starting function and the running function of the cage of the original induction motor are "decoupled" on an originally unified cage, and only the starting function is retained. Therefore, part of the cage can be removed to solve the contradiction between the starting cage and the permanent magnetic poles of the "self-starting permanent magnet motor" in the rotor space arrangement.

[0046] Further, based on the above disclosed manufacturing method of the remanufactured motor with the unequal air gap saddle pole structure, during the execution of step S1, the specific execution process of step S1 is:

[0047] A through saddle groove is cut with the rotor axis as the center line. The through saddle groove includes a middle groove and two side grooves. The middle groove and the two side grooves form a saddle shape with an opening facing the rotor axis.

[0048] It should be noted that the through saddle groove 20 is the space of the rotor 10, and the through saddle groove 20 that penetrates the silicon steel sheet of the rotor 10 is cut out by taking the axis as the center line. In order to maximize the permanent magnet area (axial direction), a "saddle groove"-shaped permanent magnet is used, and the space of the rotor 10 is set to the through saddle groove 20 accordingly.

[0049] It should also be noted that the middle groove is arranged tangentially along the rotor 10 , and the side groove is arranged tangentially along the rotor 10 .

[0050] Furthermore, there are multiple through saddle grooves, and the multiple through saddle grooves are evenly distributed along the circumferential direction of the rotor.

[0051] It should be noted that, by providing a plurality of through saddle grooves 20 , the cross-sectional area of ​​the squirrel cage can be made smaller, thereby greatly improving the resistance of the squirrel cage winding.

[0052] It should also be noted that the number of the through saddle grooves 20 is 4, and may be other numbers, but the number of the through saddle grooves 20 is not limited to 4. In the present application, the preferred number of the through saddle grooves 20 is 4.

[0053] Specifically, the middle groove running through the saddle groove has a length of 60.47 mm and a width of 6.7 mm.

[0054] It should be noted that the length of the saddle groove 20 is determined according to the size of the magnet 30, and the middle section of the saddle-shaped magnet 30 used in this application has a length of 60 mm and a width of 6 mm. Therefore, in order to facilitate the installation of the magnet 30, the length of the middle groove of the saddle groove needs to be set to 60.47 mm and the width needs to be set to 6.7 mm.

[0055] It should also be noted that the length and width of the middle groove running through the saddle groove 20 of the present invention can also be other values. Therefore, the length of the middle groove running through the saddle groove 20 is not limited to 60.47 mm, and the width is not limited to 6.7 mm.

[0056] Preferably, the interval between two adjacent permanent magnets is 2 mm.

[0057] It should be noted that those skilled in the art can calculate and determine the interval value between two adjacent permanent magnets according to actual needs, so the interval value between two adjacent permanent magnets is not limited to 2 mm.

[0058] Furthermore, the permanent magnet is a magnet group, and each magnet group has four magnets installed in parallel along the axial direction of the rotor in the through saddle slot.

[0059] It should be noted that by installing four groups of magnetic steels 30 in parallel along the axial direction of the rotor 10 in each of the through saddle grooves 20, the energy of the generated air gap magnetic field can be increased, so that the motor can meet the operating requirements (refer to Figure 4 ).

[0060] It should also be noted that four magnets 30 can be installed in each of the through saddle grooves 20, but the number of magnets 30 installed in each through saddle groove 20 is not limited to four. Those skilled in the art can select the number of magnets 30 according to the thickness of the magnets 30.

[0061] Further, when executing the process not in S3, the specific execution process of step S3 is:

[0062] Part of the outer circumference of the rotor is removed to form an eccentric circle on the outer circumference of the rotor, and the eccentric circle is aligned with the through saddle groove.

[0063] It should be noted that the eccentric circle formed by the outer peripheral surface of the rotor 10 is aligned with the saddle groove 20, which means that the center line of the eccentric circle coincides with the center line of the saddle groove 20. For details, see Figure 3 .

[0064] Specifically, the center of the eccentric circle is offset 9.82 mm radially outward from the center of the rotor, the radius of the eccentric circle is 74.48 mm, and the radius of the rotor is 168 mm.

[0065] It should be noted that those skilled in the art can set the outward offset of the center of the eccentric circle relative to the center of the rotor and the radius of the eccentric circle according to needs. The offset is not limited to 9.82 mm, and the radius of the eccentric circle is not limited to 74.48 mm.

[0066] Further, after executing step S3, the following steps are also included:

[0067] S4. Covering the outer periphery of the rotor with a magnetic isolation sleeve.

[0068] It should be noted that the reference Figure 5 By covering the outer periphery of the rotor 10 with the magnetic isolation sleeve 40, the magnetism of the magnetic steel 30 can be prevented from being reduced, and the service life of the magnetic steel 30 can be increased, thereby increasing the service life of the motor.

[0069] Further, after executing step S4, the following steps are also included:

[0070] S5, installing the remanufactured rotor 10 and other parts of the motor.

[0071] It should be noted that by installing the remanufactured rotor 10 with other parts of the motor, the motor becomes an operational whole.

[0072] Based on the above-mentioned manufacturing method of a remanufactured motor with an unequal air gap saddle pole structure, the present invention also provides a remanufactured motor with an unequal air gap saddle pole structure, referring to Figures 2 to 5 , the remanufactured motor with unequal air gap saddle pole structure comprises: a rotor 10;

[0073] The rotor 10 is provided with a through saddle groove 20 with the axis as the center line, and the through saddle groove 20 includes: a middle groove 21 and two side grooves 22; the middle groove 21 and the two side grooves 22 form a saddle shape with the opening facing the axis of the rotor 10;

[0074] The outer peripheral surface of the rotor 10 has an eccentric circle, the center of which is radially offset outward from the center of the rotor 10 ; the eccentric circle is aligned with the penetrating saddle groove 20 .

[0075] It should be noted that a saddle groove 20 is provided on the rotor 10 with the axis as the center line, so that the squirrel cage cross-sectional area of ​​the rotor 10 is reduced and the squirrel cage winding resistance is increased, so that the modified induction motor can generate a higher starting torque than the original induction motor. The outer peripheral surface of the rotor 10 is designed as an eccentric circle, so that the rotor 10 has an unequal air gap structure, which can reduce the harmonic content of the motor back electromotive force and the cogging torque.

[0076] Furthermore, the middle slot 21 is arranged tangentially along the rotor 10 , and the center line of the eccentric circle coincides with the center line of the middle slot 21 .

[0077] It should be noted that the middle slot 21 is arranged tangentially along the rotor 10, and the center line of the eccentric circle coincides with the center line of the middle slot 21, which actually coincides with the center line of the saddle slot 20. When the rotor 10 rotates, the eccentric circle will not affect the rotation of the rotor 10, and it is also beneficial to reduce the harmonic content of the motor back electromotive force and the cogging torque.

[0078] Furthermore, the side grooves 22 are arranged tangentially along the rotor 10 .

[0079] It should be noted that by arranging the side grooves 22 tangentially along the rotor 10 , the rotor 10 can rotate smoothly when the rotor 10 rotates, so that the modified induction motor can generate a higher starting torque than the original induction motor.

[0080] Furthermore, there are multiple through saddle grooves 20 , and the multiple through saddle grooves 20 are evenly distributed on the rotor 10 .

[0081] It should be noted that, by providing a plurality of the through saddle grooves 20 on the rotor 10 , the cross-sectional area of ​​the squirrel cage can be made smaller, thereby greatly improving the resistance of the squirrel cage winding.

[0082] Furthermore, the number of the through saddle grooves 20 is 4, the number of the eccentric circles is 4, and the through saddle grooves 20 and the eccentric circles are arranged in a one-to-one correspondence.

[0083] It should be noted that the number of the through saddle grooves 20 and the number of the eccentric circles are both 4, but it can also be other numbers. However, the number of the through saddle grooves 20 and the number of the eccentric circles are not limited to 4. In the present application, it is preferred that the number of the through saddle grooves 20 and the number of the eccentric circles are both 4.

[0084] Specifically, the center offset value of the eccentric circle relative to the center of the rotor 10 is 9.82 mm.

[0085] It should be noted that the center offset value of the eccentric circle relative to the center of the rotor 10 can be set to 9.82 mm, or it can be set to other values. Those skilled in the art can set the offset value according to their needs, and the center offset value of the eccentric circle relative to the center of the rotor 10 is not limited to 9.82 mm.

[0086] Furthermore, the remanufactured motor with the unequal air gap saddle pole structure further includes: a magnetic steel 30 installed in the saddle groove 20 .

[0087] It should be noted that by installing permanent magnets in the saddle slots 20 that penetrate the rotor 10 , the motor can generate sufficient air gap magnetic field energy during operation to meet the motor operation requirements.

[0088] Specifically, there are multiple magnetic steels 30 , and the multiple magnetic steels 30 are installed in parallel in the through saddle groove 20 .

[0089] It should be noted that, by installing four groups of magnetic steels 30 in parallel along the axial direction of the rotor 10 in each of the through saddle slots 20, the energy of the generated air gap magnetic field can be increased, so that the motor can meet the operation requirements.

[0090] Furthermore, the magnetic steel 30 includes: a middle magnet 31 and two side magnets 32;

[0091] The middle magnet 31 and the side magnets 32 are both rectangular structures.

[0092] It should be noted that the magnetic steel 30 is configured as a middle magnet and two side magnets to reduce the manufacturing difficulty and avoid the saddle groove 20 being unable to be installed due to processing errors.

[0093] It should also be noted that the middle magnet and the two side magnets are manufactured as one piece, which can effectively reduce assembly time and thus improve assembly efficiency.

[0094] Furthermore, the remanufactured motor with the unequal air gap saddle pole structure further includes a magnetic isolation sleeve 40 for covering the silicon steel sheet of the rotor 10 .

[0095] It should be noted that, by covering the outer periphery of the rotor 10 with the magnetic isolation sleeve 40 , the magnetism of the magnetic steel 30 can be prevented from being reduced, and the service life of the magnetic steel 30 can be increased, thereby increasing the service life of the motor.

[0096] In order to facilitate understanding of the above-mentioned remanufactured motor and manufacturing method with unequal air gap saddle pole structure, refer to Figures 2 to 9 , the scheme is further introduced below.

[0097] The present invention is to solve the problem of low efficiency of existing three-phase asynchronous motors, and re-design the motor rotor structure to realize the remanufacturing of low-efficiency induction motors into high-efficiency asynchronous starting permanent magnet synchronous motors. On the rotor of the waste induction motor, by considering the rotor cross-sectional area, part of the original squirrel cage is cut off along the axial direction, and a certain rotor space is released for placing permanent magnets, so that the rotor generates sufficient air gap magnetic field energy, thereby meeting the motor operation needs. Considering the impact of back-electromotive force harmonics on the efficiency of the motor, the unequal air gap structure is designed to achieve the purpose of reducing the back-electromotive force harmonic content and cogging torque of the motor. At the same time, considering the motor preparation cost, a "saddle-shaped" magnetic steel structure design is adopted to increase the effective area of ​​the magnetic steel. Since part of the original squirrel cage is cut off along the axial direction and part of the squirrel cage body is retained, the squirrel cage cross-sectional area becomes smaller, thereby greatly improving the squirrel cage winding resistance, and can generate a higher starting torque than the original induction motor.

[0098] The present invention is based on the remanufacturing of Y2-160-4, 15KW, three-phase asynchronous motor.

[0099] The specific remanufacturing is divided into the following steps:

[0100] 1. Identify the quality of the scrap motor, then clean and disassemble it, remove the rotor before remanufacturing, retain the original stator winding, end cover and other parts, and replace the damaged parts.

[0101] 2. In order to maximize the permanent magnet area (axial) and reduce the difficulty and cost of permanent magnet processing, a "saddle" shaped permanent magnet is used, and the volume of the permanent magnet is calculated by the equivalent ampere-turn method. The topological structure of the rotor is designed by combining mechanical strength and heat dissipation. The rotor axis is used as the center line, and a "saddle" shaped slot is processed along the center line. The saddle slot includes a middle slot and two side slots, and the length of the middle slot is 66.07mm. In order to reduce the harmonic content of the motor back electromotive force after remanufacturing, an eccentric circle of equal diameter is used, which is offset by 9.82mm in the positive and negative directions of the X and Y axes, respectively, and the radius of the circle is 74.48mm.

[0102] 3. Install magnets (N35SH) in the saddle slots. The magnet thickness is 6 mm, and the interval between two adjacent magnets along the circumference of the rotor is 2 mm (e.g. Figure 3 As shown in the figure); because part of the silicon steel sheets on the rotor are cut off during processing, the surface is covered with a magnetic shield (as shown in the figure); Figure 5 shown).

[0103] 4. Install the remanufactured rotor and other parts of the motor without using glue or potting.

[0104] 5. Motor performance analysis: Figure 6 is the distribution of magnetic lines of force of the motor; Figure 7 is the induced potential curve; Figure 8 is the torque curve; Fig. 9 The curve of motor speed changing with time.

[0105] The key points and protection points of the present invention.

[0106] The motor rotor of the present invention is a topological structure, which reconstructs the design theory of the "squirrel cage" of the induction motor. At the same time, considering the impact of back-electromotive force harmonics on the efficiency of the motor, the purpose of reducing the back-electromotive force harmonic content of the motor is achieved by designing it into an unequal air gap structure. After permanent magnetization and remanufacturing, the starting function and the running function of the squirrel cage of the original induction motor are "decoupled" on the original unified squirrel cage, and only the starting function is retained. Therefore, part of the squirrel cage can be removed to solve the contradiction between the starting cage and the permanent magnetic poles of the "self-starting permanent magnet motor" in the rotor space arrangement. And a novel magnetic pole structure, and provide sufficient air gap magnetic field strength, so as to support the motor to achieve the medium role of electromechanical energy conversion, and obtain a sinusoidal air gap magnetic density to reduce losses and improve efficiency.

[0107] Each embodiment in this specification is described in a progressive manner, and the same or similar parts between the embodiments can be referred to each other, and each embodiment focuses on the differences from other embodiments. In particular, for the system or system embodiment, since it is basically similar to the method embodiment, the description is relatively simple, and the relevant parts can be referred to the partial description of the method embodiment. The system and system embodiments described above are merely schematic, wherein the units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, they may be located in one place, or they may be distributed on multiple network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the scheme of this embodiment. Ordinary technicians in this field can understand and implement it without paying creative labor.

[0108] Professionals may further appreciate that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, computer software, or a combination of the two. In order to clearly illustrate the interchangeability of hardware and software, the composition and steps of each example have been generally described in the above description according to function. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professionals and technicians may use different methods to implement the described functions for each specific application, but such implementation should not be considered to be beyond the scope of the present invention.

[0109] The above description of the disclosed embodiments enables one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A method for manufacturing a remanufactured motor having an unequal air gap saddle pole structure, characterized in that: include: Remove part of the rotor cage to free up some rotor space; Installing a permanent magnet in the rotor space; Removing part of the outer circumference of the rotor so that the rotor has an unequal air gap structure; The method of removing part of the rotor cage to release a certain amount of rotor space includes: Taking the rotor axis as the center line, a through saddle groove is cut, wherein the through saddle groove comprises: a middle groove and two side grooves; the middle groove and the two side grooves form a saddle shape with an opening facing the rotor axis; The number of the through saddle grooves is multiple, and the multiple through saddle grooves are evenly distributed along the circumference of the rotor; the interval between two adjacent permanent magnets along the circumference of the rotor is 2 mm; The permanent magnet is a magnetic steel group, and each magnetic steel group has four magnetic steels installed in parallel along the axial direction of the rotor in the through saddle slot; The removing of part of the outer circumferential surface of the rotor so that the rotor has an unequal air gap structure comprises: Part of the outer circumference of the rotor is removed to form an eccentric circle on the outer circumference of the rotor, and the eccentric circle is aligned with the through saddle groove.

2. The manufacturing method according to claim 1, characterized in that: The length of the middle groove running through the saddle groove is 60.47 mm and the width is 6.7 mm.

3. The manufacturing method according to claim 1, characterized in that: The center of the eccentric circle is offset 9.82 mm radially outward from the center of the rotor, and the radius of the eccentric circle is 74.48 mm.

4. The manufacturing method according to claim 1, characterized in that: After removing part of the outer circumference of the rotor so that the rotor has an unequal air gap structure, the method further includes: The outer circumference of the rotor is covered with a magnetic isolation sleeve.

5. The manufacturing method according to claim 4, characterized in that: After covering the outer circumference of the rotor with a magnetic isolation sleeve, the method further includes: The remanufactured rotor is installed with other parts of the motor.

6. A remanufactured motor with an unequal air gap saddle pole structure, characterized in that: A remanufactured motor having an unequal air gap saddle pole structure manufactured according to the manufacturing method according to any one of claims 1 to 5.

Images