An electric motor and its manufacturing method

Abstract

This invention provides an electric motor and its manufacturing method. The motor includes a stator and a rotor, the rotor including an inner rotor and an outer rotor, both of which are cylindrical hollow parts. The inner rotor is disposed on the inner side of the stator, and the outer rotor is disposed on the outer side of the stator, so that electromagnetic induction magnetic circuits are formed on both the inner and outer sides of the stator, making full use of the magnetic field space formed by the stator, reducing magnetic leakage, improving the magnetic performance of the motor, and solving the problem in the prior art that the structural limitations of inner rotor motors and outer rotor motors prevent the full utilization of the stator magnetic field. The internal heat dissipation space of the motor is increased, effectively reducing the internal energy loss generated during rotor rotation. The stator winding module is formed by enameled wire that is wrapped around and cured, and the stator winding module is bonded to the base. Multiple stator winding modules are arranged alternately, eliminating the rotor core and stator core, reducing the hysteresis loss generated by the core. Terminals are formed on the base, optimizing the wiring process.

Description

Technical Field

[0001] This invention belongs to the field of motor technology, and particularly relates to a motor and its manufacturing method. Background Technology

[0002] With the continuous expansion of the home appliance market, motors, as an important component, are being used in an increasingly wider range of applications. Existing technologies mainly include internal rotor motors and external rotor motors. Both types of motors consist of a stator and a rotor. When the stator windings are energized, they form a rotating magnetic field. The rotor is placed in this changing magnetic field and generates torque, causing it to rotate. However, the rotor is located on one side of the stator, meaning the magnetic fields formed on both sides of the stator are not fully utilized, resulting in low magnetic field utilization and significant magnetic leakage. Furthermore, the rotor's solid structure design leads to low heat dissipation efficiency. Summary of the Invention

[0003] In view of this, the present invention provides an electric motor and a manufacturing method thereof to solve the problems of low utilization rate of the magnetic field formed by the stator and low heat dissipation efficiency of the motor in the prior art.

[0004] The present invention provides an electric motor, including a stator and a rotor, wherein the rotor includes an inner rotor and an outer rotor, and the inner rotor and the outer rotor are both cylindrical hollow parts connected together; the inner rotor is disposed on the inner side of the stator, and the outer rotor is disposed on the outer side of the stator.

[0005] Further optionally, the inner rotor is a squirrel cage structure, comprising a first end ring A, a first end ring B, and a plurality of first guide bars. The plurality of first guide bars are arranged circumferentially between the first end ring A and the first end ring B, and the two ends of each first guide bar are respectively connected to the first end ring A and the first end ring B; and / or,

[0006] The outer rotor is a squirrel cage structure, which includes a second end ring A, a second end ring B and a plurality of second guide bars. The plurality of second guide bars are arranged circumferentially between the second end ring A and the second end ring B, and the two ends of each second guide bar are respectively connected to the second end ring A and the second end ring B.

[0007] Further optionally, a plurality of the first guide strips are arranged in parallel, and the angle between the first guide strips and the plane containing the first end ring A is α, wherein 0° < α < 90°; and / or,

[0008] Multiple second guide bars are arranged in parallel, and the angle between the second guide bar and the plane containing the second end ring A is β, where 0° < β < 90°.

[0009] Further optionally, the inner rotor and the outer rotor are coaxially arranged, and an end cover is provided at the same axial end of the inner rotor and the outer rotor; the end cover connects the inner rotor and the outer rotor together, and an annular groove is formed between the end cover, the inner rotor and the outer rotor; the stator is disposed in the annular groove.

[0010] Further optionally, the end cover has a first shaft hole; the motor also includes a rotating shaft, one end of which is disposed at the first shaft hole and is connected to the end cover in a transmission manner, so that the rotating shaft rotates synchronously with the inner rotor and the outer rotor.

[0011] Further optionally, the stator includes a stator winding disposed within the annular groove; the stator winding includes a plurality of stator winding modules, each of which is formed by winding enameled wire and then curing it.

[0012] Further optionally, each of the stator winding modules is an arc-shaped structure, and the number of phases of the stator winding is m, where m≥2; the total number of stator winding modules is 2n, and the 2n stator winding modules are arranged at intervals on the same circumference; n≥2.

[0013] Further optionally, the plurality of stator winding modules include main phase winding modules and secondary phase winding modules arranged at phase intervals, wherein the in-phase coils of the main phase winding modules are connected in series and connected end to end; and the in-phase coils of the secondary phase winding modules are connected in series and connected end to end.

[0014] Further optionally, the motor also includes a base, the base having a bearing seat and a terminal block; the bearing seat is provided with a bearing, and the other end of the rotating shaft is connected to the base through the bearing;

[0015] The stator winding module is mounted on the base; the stator winding module is correspondingly mounted with the wiring terminals and is electrically connected to the power supply line through the wiring terminals.

[0016] The present invention also provides a method for manufacturing an electric motor as described in any of the preceding claims, the method comprising:

[0017] The inner and outer rotors are die-cast using a die-casting mold;

[0018] The inner rotor and the outer rotor are arranged in a first injection mold, and the injection molding material is injected into the first injection mold to form the rotor.

[0019] Further, optionally, the manufacturing method further includes:

[0020] Enamelled wire is wound and cured to form stator windings;

[0021] The stator winding is placed in a second injection mold, and injection molding material is injected into the second injection mold to form a base, and the base is connected to the stator winding.

[0022] Compared with the prior art, the main advantages of the present invention are:

[0023] (1) The rotor is divided into an inner rotor and an outer rotor, which are respectively set on the inner and outer sides of the stator, so that electromagnetic induction magnetic circuits are formed on both the inner and outer sides of the stator. This makes full use of the magnetic field space formed by the stator, improves the utilization rate of the stator magnetic field and the rotor torque, reduces the leakage magnetic field, and improves the magnetic performance of the motor. This solves the problem that the stator magnetic field cannot be fully utilized due to the structural limitations of the inner rotor motor and the outer rotor motor in the prior art. Both the inner rotor and the outer rotor are cylindrical hollow parts, which increases the heat dissipation space inside the motor, improves the heat dissipation system of the motor, effectively reduces the internal energy loss generated during the rotor rotation, and solves the problem that the low heat dissipation efficiency of the motor leads to large internal energy loss. This solves the problem that the magnetic field on the inner and outer sides of the stator cannot be fully utilized and effectively cut, resulting in magnetic leakage between the magnetic poles.

[0024] (2) Eliminating the rotor core simplifies the rotor structure and manufacturing process, and reduces the hysteresis loss generated by the rotor core; the enameled wire is wound and cured to form stator winding modules, which are then bonded to the base, eliminating the stator core, simplifying the stator structure and manufacturing process, and reducing the hysteresis loss generated by the stator core; multiple stator winding modules are spaced apart, increasing the heat dissipation space inside the motor and improving the motor's heat dissipation efficiency; reducing the cost of the motor; and solving the problem of poor heat dissipation caused by the solid design of the rotor and stator in the existing technology.

[0025] (3) Terminals are formed on the base to reliably connect the stator winding module wire ends to the power supply line, simplifying the wiring structure, optimizing the wiring process, making the operation convenient and quick, and improving the wiring efficiency; solving the problems of complicated wiring process, easy operator to connect the wrong wires and low wiring efficiency, solving the problems of easy loosening of the connection between the power supply line and the stator winding module wire ends and unreliable connection, preventing the connection from being loosened by tension, and avoiding the power supply line from becoming scattered and messy. Attached Figure Description

[0026] To more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings in the following description are merely exemplary, and those skilled in the art can derive other embodiments based on the provided drawings without creative effort.

[0027] The structures, proportions, sizes, etc. illustrated in this specification are only for the purpose of assisting those skilled in the art in understanding and reading the content disclosed herein, and are not intended to limit the conditions under which the present invention can be implemented. Therefore, they have no substantial technical significance. Any modifications to the structure, changes in the proportions, or adjustments to the size, without affecting the effects and objectives that the present invention can produce, should still fall within the scope of the technical content disclosed in the present invention.

[0028] Figure 1a and Figure 1b A schematic diagram of an embodiment of the rotor provided by the present invention;

[0029] Figure 2a and Figure 2b A schematic diagram of an embodiment of the stator provided by the present invention;

[0030] Figure 3 This is a schematic diagram of the winding method and wiring embodiment of the stator winding provided by the present invention;

[0031] Figure 4a and Figure 4b This is a schematic diagram of the structure of an embodiment of the motor provided by the present invention;

[0032] Figure 5 A schematic flowchart illustrating an embodiment of the motor manufacturing method provided by the present invention;

[0033] In the picture:

[0034] 1-Rotor; 11-Inner rotor; 111-First end ring A; 112-First end ring B; 113-First guide bar; 12-Outer rotor; 121-Second end ring A; 122-Second end ring B; 123-Second guide bar; 13-End cap; 131-First shaft hole; 132-Protruding slot;

[0035] 2-Shaft; 21-Convex mounting plate; 22-Connecting part; 3-Stator winding; 311-First main phase winding module; 312-Second main phase winding module; 321-First secondary phase winding module; 322-Second secondary phase winding module; 33-Magnetic field line distribution;

[0036] 4-Base; 41-Bearing seat; 42-Second shaft hole; 43-Terminal; 431-First terminal; 432-Second terminal; 433-Third terminal; 434-Fourth terminal; 44-Mounting hole; 5-Bearing. Detailed Implementation

[0037] The following specific embodiments illustrate the implementation of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0038] The terminology used in the embodiments of this invention is for the purpose of describing particular embodiments only and is not intended to limit the invention. The singular forms “a,” “the,” and “the” used in the embodiments of this invention and the appended claims are also intended to include the plural forms, unless the context clearly indicates otherwise. “Multiple” generally includes at least two, but does not exclude the inclusion of at least one.

[0039] It should be understood that the term "and / or" used in this article is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this article generally indicates that the preceding and following related objects have an "or" relationship.

[0040] It should also be noted that the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a product or system comprising a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a product or system. Without further limitation, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the product or system that includes said element.

[0041] In the existing technology, whether it is an internal rotor motor or an external rotor motor, its structure includes a stator and a rotor. When the stator winding is energized, it forms a rotating magnetic field, which causes the rotor to rotate. However, the rotor is located on one side of the stator, and the magnetic field formed on both sides of the stator is not fully utilized, resulting in low magnetic field utilization and more leakage flux. In addition, the rotor adopts a solid structure design, which results in low heat dissipation efficiency of the motor.

[0042] This invention creatively provides an electric motor, including a stator and a rotor, the rotor including an inner rotor and an outer rotor, and the inner rotor and the outer rotor are both cylindrical hollow parts connected together; the inner rotor is disposed on the inner side of the stator, and the outer rotor is disposed on the outer side of the stator;

[0043] Electromagnetic induction circuits are formed on both the inner and outer sides of the stator, making full use of the magnetic field space formed by the stator, reducing leakage flux, improving the magnetic performance of the motor, and solving the problem that the stator magnetic field cannot be fully utilized due to the structural limitations of internal rotor motors and external rotor motors in the prior art; the heat dissipation space inside the motor is increased, effectively reducing the internal energy loss generated during rotor rotation.

[0044] <rotor>

[0045] like Figure 1a and Figure 1b As shown, in this embodiment, the rotor 1 includes an inner rotor 11 and an outer rotor 12, and both the inner rotor 11 and the outer rotor 12 are cylindrical hollow parts connected together; the inner rotor 11 is disposed on the inner side of the stator, and the outer rotor 12 is disposed on the outer side of the stator.

[0046] In summary, electromagnetic induction circuits are formed on both the inner and outer sides of the stator, making full use of the magnetic field space created by the stator, improving the utilization rate of the stator magnetic field and the rotor torque, reducing leakage flux, and improving the magnetic performance of the motor. This solves the problem in existing technologies where the structural limitations of inner and outer rotor motors prevent the full utilization of the stator magnetic field. Both the inner and outer rotors are cylindrical hollow parts, improving the motor's heat dissipation system, increasing the internal heat dissipation space, and facilitating the rapid outward dissipation of heat from the motor's interior. This effectively reduces the internal energy loss generated during rotor rotation, solving the problem of low heat dissipation efficiency leading to high internal energy loss, and reducing the cost of motor raw materials.

[0047] Furthermore, the inner rotor 11 is a squirrel cage structure, which includes a first end ring A 111, a first end ring B 112, and a plurality of first guide bars 113. The first end ring A 111 and the first end ring B 112 are arranged opposite to each other. The plurality of first guide bars 113 are arranged between the first end ring A 111 and the first end ring B 112, and the plurality of first guide bars 113 are arranged at intervals along the circumference of the first end ring A 111. The two ends of each first guide bar 113 are respectively connected to the first end ring A 111 and the first end ring B 112. A hollow structure is formed between two adjacent first guide bars 113, through which the heat inside the motor can pass, increasing the heat dissipation area and airflow, and reducing the vibration and noise of the motor.

[0048] Preferably, a plurality of first guide bars 113 are arranged in parallel, and the angle between the first guide bar 113 and the plane containing the first end ring A 111 is α, wherein 0°<α<90°, which extends the length of the first guide bar 113, increases the area of ​​the stator magnetic field acting on the first guide bar 113, and improves the rotor torque.

[0049] Furthermore, the outer rotor 12 has a squirrel cage structure, which includes a second end ring A 121, a second end ring B 122, and a plurality of second guide bars 123. The second end ring A 121 and the second end ring B 122 are arranged opposite to each other. The plurality of second guide bars 123 are arranged between the second end ring A 121 and the second end ring B 122, and the plurality of second guide bars 123 are arranged at intervals along the circumference of the second end ring A 121. The two ends of each second guide bar 123 are respectively connected to the second end ring A 121 and the second end ring B 122. A hollow structure is formed between two adjacent second guide bars 123, through which the heat inside the motor can pass, increasing the heat dissipation area and airflow, and reducing the vibration and noise of the motor.

[0050] Preferably, multiple second guide bars 123 are arranged in parallel, and the angle between the second guide bar 123 and the plane containing the second end ring A 121 is β, where 0° < β < 90°. This extends the length of the second guide bar 123, increases the area of ​​the stator magnetic field acting on the second guide bar, and improves the rotor torque.

[0051] Both the inner rotor 11 and the outer rotor 12 are formed by die casting and are made of the same material. It should be noted that the number and shape of the first guide bar 113 and the second guide bar 123 are not limited and can be multiple combinations of other numbers and shapes.

[0052] The motor also includes a rotating shaft 2. To address the problem that the rotating shaft 2 cannot rotate synchronously with the inner rotor 11 and the outer rotor 12, this embodiment proposes that the inner rotor 11 and the outer rotor 12 are coaxially arranged, and an end cover 13 is provided at the same axial end of the inner rotor 11 and the outer rotor 12. The end cover 13 connects the inner rotor 11 and the outer rotor 12 together, and an annular groove is formed between the end cover 13, the inner rotor 11, and the outer rotor 12. The stator is disposed within the annular groove. Specifically, the end cover 13 is disposed on the same side as the first end ring B 112 and the second end ring B 122, and the end cover 13 connects the first end ring B 112 and the second end ring B 122.

[0053] Furthermore, a first shaft hole 131 is formed at the center of the end cover 13, and the first shaft hole 131 is coaxially arranged with the inner rotor 11 and the outer rotor 12; the motor also includes a rotating shaft 2, one end of which is arranged at the first shaft hole 131 and is connected to the end cover 13 for transmission, so that the rotating shaft 2 rotates synchronously with the inner rotor 11 and the outer rotor 12.

[0054] Furthermore, a convex groove 132 is formed at the first shaft hole 131, and a convex stage 21 is formed at one end of the rotating shaft 2. When one end of the rotating shaft 2 is set at the first shaft hole 131, the convex stage 21 is embedded in the convex groove 132, so that the rotating shaft 2 is connected to the end cover 13 for transmission, and thus the inner rotor 11, the outer rotor 12, the end cover 13 and the rotating shaft 2 can rotate synchronously; the convex stage 21 and the convex groove 132 are interference-fitted, and the interference amount is 5μm to 20μm.

[0055] It should be noted that the drive connection between the rotating shaft 2 and the end cover 13 is not limited to the convex mounting plate 21 and the convex mounting groove 132. Other connection methods can also be used, such as keys, pins and threads.

[0056] End cap 13 is an injection molded part, preferably made of nylon or PBT plastic-coated material. The specific molding process is as follows:

[0057] The die-cast inner rotor 11 and outer rotor 12 are placed in the first injection mold, and the injection molding material is injected into the first injection mold so that the inner rotor 11 and outer rotor 12 are injection molded together to form a rotor.

[0058] In summary, both the inner and outer rotors adopt a squirrel cage structure, eliminating the rotor core. This results in a simpler rotor structure, lighter weight, higher rotational performance, and a larger heat dissipation space, which improves heat dissipation efficiency, reduces internal energy loss during rotor rotation, simplifies the rotor structure and manufacturing process, and reduces hysteresis loss caused by the rotor core.

[0059] <Stator and base>

[0060] like Figure 2a and Figure 2b As shown, in this embodiment, the stator includes a stator winding 3, which is disposed between the inner rotor 11 and the outer rotor 12. The stator winding 3 includes multiple stator winding modules. Each stator winding module is formed by first winding enameled wire to form a prototype of the stator winding 3, and then by curing and gluing to form the final stator winding module.

[0061] Furthermore, each stator winding module has an arc-shaped structure, and the number of phases of stator winding 3 is m, where m ≥ 2; the total number of stator winding modules is 2n, and the 2n stator winding modules are arranged alternately on the same circumference, where n ≥ 2; the 2n stator winding modules are arranged coaxially with the rotor.

[0062] Specifically, the magnetic field lines of stator winding 3 are distributed as follows: Figure 3 As shown, the multiple stator winding modules include main phase winding modules and secondary phase winding modules arranged at phase intervals. The main phase winding modules include a first main phase winding module 311 and a second main phase winding module 312, and the first main phase winding module 311 and the second main phase winding module 312 are connected in series. The secondary phase winding modules include a first secondary phase winding module 321 and a second secondary phase winding module 322, and the first secondary phase winding module 321 and the second secondary phase winding module 322 are connected in series.

[0063] The winding process of stator winding 3 is as follows:

[0064] First, connect the end of an enameled wire to the main phase power line;

[0065] Next, the remaining part of the enameled wire is continuously wound into a first main phase winding module 311 and a second main phase winding module 312. The first main phase winding module 311 is wound clockwise (CW), and the second main phase winding module 312 is wound counterclockwise (CCW). The end of the second main phase winding module 312 is electrically connected to the grounding wire.

[0066] Next, connect the end of the other enameled wire to the secondary phase power line.

[0067] Finally, the remaining portion of the enameled wire is continuously wound into a first secondary phase winding module 321 and a second secondary phase winding module 322. The first secondary phase winding module 321 is wound clockwise (CW), and the second secondary phase winding module 322 is wound counterclockwise (CCW). The end of the second secondary phase winding module 322 is electrically connected to the grounding wire.

[0068] It should be noted that the number of stator windings 3 is not limited and can be flexibly and optimally set according to the performance parameters of the motor. The material of stator windings 3 is preferably enameled aluminum wire or enameled copper wire. The winding direction of the main phase winding module and the auxiliary phase winding module is not limited to clockwise or counterclockwise and can be set according to actual needs and the direction of motor rotation.

[0069] like Figure 4a and Figure 4b As shown, the motor also includes a base 4, which is disposed on the same side as the first end ring A 111 and the second end ring A 121. The base 4 has a circular structure, and a bearing seat 41 and a second shaft hole 42 are formed at the center of the base 4. The bearing seat 41, the second shaft hole 42 and the first shaft hole 131 are coaxially arranged. The bearing seat 41 is provided with a bearing 5. The other end of the rotating shaft 2 passes through the bearing seat 41 and the second shaft hole 42 in sequence and extends to the side of the base 4 away from the first end ring A 111. Then the rotating shaft 2 is connected to the base 4 through the bearing 5. In this way, the rotor and the rotating shaft 2 rotate synchronously relative to the base 4. The outer ring of the bearing 5 is interference-fitted with the base 4, and the interference is 5μm to 20μm. In addition, the other end of the rotating shaft 2 forms a connecting part 22 for connecting the rotating shaft 2 with other components so that the rotating shaft 2 drives other components to rotate. Specifically, the connecting part 22 is threaded.

[0070] The stator winding modules are mounted on the base using adhesive bonding; the stator core is eliminated, simplifying the stator structure and manufacturing process, and reducing the hysteresis loss caused by the stator core; multiple stator winding modules are arranged alternately, increasing the heat dissipation space inside the motor and improving the motor's heat dissipation efficiency; the cost of the motor is reduced; and the problem of high raw material costs caused by the use of silicon steel sheets in existing motor technologies is solved.

[0071] Near its outer edge, the base 4 also has terminals 43. The number of terminals 43 is the same as the number of stator winding modules. In this embodiment, there are four terminals 43. The four terminals 43 are arranged at intervals along the circumference of the base 4, and the terminals 43 are corresponding to the stator winding modules. The corresponding stator winding modules are electrically connected to the power lines through the terminals 43. The four terminals 43 are the first terminal 431, the second terminal 432, the third terminal 433, and the fourth terminal 434. The first terminal 431 is corresponding to the first main phase winding module 311, the second terminal 432 is corresponding to the second main phase winding module 312, the third terminal 433 is corresponding to the first auxiliary phase winding module 321, and the fourth terminal 434 is corresponding to the second auxiliary phase winding module 322.

[0072] The wiring structure is simplified, the wiring process is optimized, the operation is convenient and quick, and the wiring efficiency is improved; it solves the problems of cumbersome wiring process, easy operator to connect the wrong wires and low wiring efficiency, and solves the problems of easy loosening and unreliable connection of the wire ends between the power line and the stator winding module, prevents the connection from loosening under tension, and avoids the power line from scattering and becoming messy; the base 4 also has mounting holes 44, including four, for fixing the motor;

[0073] Base 4 is an injection molded part, preferably made of nylon or PBT plastic-coated materials. The specific molding process is as follows:

[0074] The enameled wire is wound around and cured to form the stator winding 3;

[0075] The stator winding 3 is placed in the second injection mold, and the injection molding material is injected into the second injection mold so that the stator winding 3 is injection molded together to form the base 4.

[0076] In summary, the stator winding 3 without a stator core is set between the inner rotor 11 and the outer rotor 12. The stator winding 3 can generate a rotating magnetic field when current is applied. The first conductor bar 113 and the second conductor bar 123 can effectively cut the magnetic lines of force generated by the rotating magnetic field, generate electromagnetic torque, and drive the rotor 1 to rotate. Thus, a design structure of a coreless motor with a dual magnetic circuit and two magnetic field air gaps is established.

[0077] <Manufacturing Method>

[0078] like Figure 5 As shown, this embodiment also provides a method for manufacturing an electric motor as described in any of the above claims, the method comprising:

[0079] S1. Use a die-casting mold to die-cast the inner rotor 11 and the outer rotor 12;

[0080] S2. The inner rotor 11 and the outer rotor 12 are placed in the first injection mold, and the injection molding material is injected into the first injection mold to form the rotor 1;

[0081] S3. The enameled wire is wound around and then cured and bonded to form stator winding 3;

[0082] Specifically, enameled wire is wound around using specific tooling and winding equipment, and then cured and bonded with adhesive to form stator winding 3;

[0083] S4. Set the stator winding 3 in the second injection mold, inject the injection plastic into the second injection mold to form the base 4, and connect the base 4 to the stator winding 3.

[0084] Both the rotor and stator are injection molded as a single unit, eliminating the need for rotor and stator cores, which simplifies the motor's structure and manufacturing process and reduces hysteresis losses.

[0085] Furthermore, the manufacturing method also includes:

[0086] S5. Using machine tools or CNC machine tools, process the rotating shaft 2;

[0087] S6. Connect one end of the rotating shaft 2 to the first shaft hole 131 for transmission, and connect the other end of the rotating shaft 2 to the base 4 through the bearing 5; thus completing the fabrication of the coreless, double-cage rotor structure motor.

[0088] Exemplary embodiments of this disclosure have been specifically shown and described above. It should be understood that this disclosure is not limited to the detailed structures, arrangements, or implementations described herein; rather, this disclosure is intended to cover various modifications and equivalent arrangements contained within the spirit and scope of the appended claims.

Claims

1. An electric motor, characterized in that, It includes a stator and a rotor, wherein the stator is a coreless stator and the rotor is a coreless rotor; the rotor includes an inner rotor and an outer rotor, and the inner rotor and the outer rotor are both cylindrical hollow parts connected together; the inner rotor is disposed on the inner side of the stator and the outer rotor is disposed on the outer side of the stator; The inner rotor is a squirrel cage structure, which includes a first end ring A, a first end ring B and a plurality of first guide bars. The plurality of first guide bars are arranged circumferentially between the first end ring A and the first end ring B, and the two ends of each first guide bar are respectively connected to the first end ring A and the first end ring B. The plurality of first guide bars are arranged in parallel, and the angle between the first guide bar and the plane containing the first end ring A is α, where 0° < α < 90°. The outer rotor is a squirrel cage structure, which includes a second end ring A, a second end ring B and a plurality of second guide bars. The plurality of second guide bars are arranged circumferentially between the second end ring A and the second end ring B, and the two ends of each second guide bar are respectively connected to the second end ring A and the second end ring B. The plurality of second guide bars are arranged in parallel, and the angle between the second guide bar and the plane containing the second end ring A is β, wherein 0° < β < 90°.

2. The motor according to claim 1, characterized in that, The inner rotor and the outer rotor are coaxially arranged, and an end cover is provided at the same axial end of the inner rotor and the outer rotor; the end cover connects the inner rotor and the outer rotor together, and an annular groove is formed between the end cover, the inner rotor and the outer rotor; the stator is disposed in the annular groove.

3. The motor according to claim 2, characterized in that, The end cap has a first shaft hole; the motor also includes a rotating shaft, one end of which is disposed at the first shaft hole and is connected to the end cap for transmission, so that the rotating shaft rotates synchronously with the inner rotor and the outer rotor.

4. The motor according to claim 3, characterized in that, The stator includes a stator winding, which is disposed in the annular groove; the stator winding includes multiple stator winding modules, each of which is formed by winding enameled wire and then curing it.

5. The motor according to claim 4, characterized in that, Each stator winding module has an arc-shaped structure, and the number of phases of the stator winding is m, where m ≥ 2; the total number of stator winding modules is 2n, and the 2n stator winding modules are arranged at intervals on the same circumference, where n ≥ 2.

6. The motor according to claim 4, characterized in that, The multiple stator winding modules include main phase winding modules and secondary phase winding modules arranged at phase intervals. The in-phase coils of the main phase winding modules are connected in series and connected end to end; the in-phase coils of the secondary phase winding modules are connected in series and connected end to end.

7. The motor according to claim 4, characterized in that, The motor also includes a base, the base having a bearing position and a terminal block; the bearing position is provided with a bearing, and the other end of the rotating shaft is connected to the base through the bearing; The stator winding module is mounted on the base; the stator winding module is correspondingly mounted with the wiring terminals and is electrically connected to the power supply line through the wiring terminals.

8. A method for manufacturing an electric motor as described in any one of claims 1-7, characterized in that, The manufacturing method includes: The inner and outer rotors are die-cast using a die-casting mold; The inner rotor and the outer rotor are arranged in a first injection mold, and the injection molding material is injected into the first injection mold to form the rotor.

9. The method for manufacturing an electric motor according to claim 8, characterized in that, The manufacturing method further includes: Enamelled wire is wound and cured to form stator windings; The stator winding is placed in a second injection mold, and injection molding material is injected into the second injection mold to form a base, and the base is connected to the stator winding.

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