Inductor motor and flywheel energy storage device

Abstract

The application relates to an induction motor and a flywheel energy storage device. The induction motor comprises a shell, a rotor assembly and a stator assembly. The shell comprises a shell body, a first end cover and a second end cover. The shell body is provided with a containing cavity. The first end cover is arranged at one end of the shell body. The second end cover is arranged at the other end of the shell body to form the containing cavity. The rotor assembly comprises a rotor and a filler. The rotor is rotatably arranged in the containing cavity. The side surface of the rotor is provided with grooves to form salient poles between the grooves. The filler is arranged in the grooves. The stator assembly comprises a stator and a first armature winding. The stator is arranged on the inner side wall of the shell body and is arranged around the rotor at intervals. The first armature winding is arranged on the stator. The induction motor and the flywheel energy storage device have the advantages of small loss and high efficiency.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of electric machines, in particular to an induction sub-machine and a flywheel energy storage device. BACKGROUND

[0002] Due to large rotational inertia and compact structure, the induction sub-machine is widely used in flywheel energy storage devices.

[0003] At present, the induction sub-machine has a rotor with a salient pole structure, so that the outer side of the rotor forms a side concave-convex structure. Therefore, the rotor of the induction sub-machine will generate a large wind friction loss at high speed, and the mechanical bearing will generate a serious mechanical friction loss, that is, the induction sub-machine generates a large standby loss due to wind friction loss and mechanical friction loss during operation, thereby reducing the energy conversion efficiency of the flywheel energy storage device using the induction sub-machine, and having the defects of high loss and low efficiency. SUMMARY

[0004] Therefore, it is necessary to provide an induction sub-machine to solve the problems of high loss and low efficiency of the induction sub-machine.

[0005] The present application provides an induction sub-machine, comprising:

[0006] a housing, the housing comprising a housing body, a first end cover and a second end cover, the housing body being provided with a receiving cavity, the first end cover being arranged at one end of the housing body, and the second end cover being arranged at the other end of the housing body;

[0007] a rotor assembly, the rotor assembly comprising a rotor and a filler, the rotor being rotatably arranged in the receiving cavity, the side of the rotor being provided with grooves to form salient poles between the grooves, and the filler being mounted in the grooves;

[0008] a stator assembly, the stator assembly comprising a stator and a first armature winding, the stator being arranged on the inner side wall of the housing body and spaced around the rotor, and the first armature winding being mounted on the stator.

[0009] In one embodiment, the grooves comprise a plurality of first sub-grooves and a plurality of second sub-grooves, the plurality of first sub-grooves being arranged at one end of the rotor along the circumferential direction of the rotor to form a plurality of first salient poles at one end of the rotor along the circumferential direction, and the plurality of second sub-grooves being arranged at the other end of the rotor along the circumferential direction of the rotor to form a plurality of second salient poles at the other end of the rotor along the circumferential direction; the filler comprises a plurality of first sub-fillers and a plurality of second sub-fillers, the first sub-fillers being arranged one by one in the first sub-grooves, and the second sub-fillers being arranged one by one in the second sub-grooves.

[0010] In one of the embodiments, the electrical angle between the first salient pole and the second salient pole is 180 degrees.

[0011] In one of the embodiments, the stator assembly further comprises a first magnetic bearing and a second magnetic bearing, both of which are arranged in the accommodating cavity, one end of the rotor is arranged through the first magnetic bearing, and the other end of the rotor is arranged through the second magnetic bearing.

[0012] In one of the embodiments, the rotor assembly further comprises a first restraining member and a second restraining member, one end of the rotor is provided with a first mounting boss, the first restraining member is mounted on the first mounting boss, the other end of the rotor is provided with a second mounting boss, and the second restraining member is mounted on the second mounting boss.

[0013] In one of the embodiments, the first magnetic bearing comprises a first ring body and a second armature winding, four first teeth are arranged on the inner side of the first ring body and extend along the axial direction of the rotor, and the second armature winding is arranged around the first teeth; the second magnetic bearing comprises a second ring body and a third armature winding, four second teeth are arranged on the inner side of the second ring body and extend along the axial direction of the rotor, and the third armature winding is arranged around the second teeth.

[0014] In one of the embodiments, the first teeth and the second teeth are arranged at an interval of 45 degrees in the circumferential direction of the rotor.

[0015] In one of the embodiments, the stator comprises a first sub-stator and a second sub-stator, the first sub-stator is arranged along the circumferential direction of the first sub-filler, the second sub-stator is arranged along the circumferential direction of the second sub-filler, the shell further comprises a permanent magnet, the permanent magnet is embedded in the shell body, and the permanent magnet is arranged between the first sub-stator and the second sub-stator.

[0016] In one of the embodiments, the shell further comprises a first bearing and a second bearing, the first end cover is provided with a first mounting groove, the first bearing is mounted in the first mounting groove, one end of the rotor is provided with a first connecting part, the first connecting part is mounted in the first bearing, the second end cover is provided with a second mounting groove, the second bearing is mounted in the second mounting groove, the other end of the rotor is provided with a second connecting part, and the second connecting part is mounted in the second bearing.

[0017] The application further provides a flywheel energy storage device comprising the induction sub-motor.

[0018] The inductor motor and the flywheel energy storage device have a rotatable rotor assembly arranged in a containing cavity of a shell, and a stator assembly is arranged around the circumference of the rotor assembly, and the magnetic field generated by the stator assembly drives the rotor to rotate. The rotor is provided with a groove forming a salient pole, in order to avoid the generation of a large wind friction loss in the groove during the rotation of the rotor, a filler is arranged in the groove, so that the entire rotor has a cylindrical structure and the surface is smoother, so that when the inductor motor is in a high-speed rotating state, on the one hand, the weight of the filler can effectively increase the moment of inertia of the rotor and improve the efficiency of the inductor motor, and on the other hand, the filler can effectively suppress the wind friction loss, and has the advantages of low loss and high efficiency. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 A structural schematic diagram of the inductor motor described in the embodiments of the present application.

[0020] Figure 2 A sectional structural schematic diagram of the inductor motor described in the embodiments of the present application.

[0021] Figure 3 A structural schematic diagram of the rotor assembly of the inductor motor described in the embodiments of the present application.

[0022] Figure 4 An exploded schematic diagram of the rotor assembly of the inductor motor described in the embodiments of the present application.

[0023] Figure 5 A structural schematic diagram of the first magnetic bearing of the inductor motor described in the embodiments of the present application.

[0024] Figure 6 An installation schematic diagram of the second magnetic bearing of the inductor motor described in the embodiments of the present application.

[0025] REFERENCE SIGNS:

[0026] 100, shell; 100A, containing cavity; 110, shell body; 120, first end cover; 120A, first mounting groove; 130, second end cover; 130A, second mounting groove; 140, first bearing; 150, second bearing; 160, permanent magnet;

[0027] 200, rotor assembly; 210, rotor; 210A, groove; 211A, first sub-groove; 212A, second sub-groove; 213, first salient pole; 214, second salient pole; 215, first mounting boss; 216, second mounting boss; 217, first connecting part; 218, second connecting part; 220, filler; 221, first sub-filler; 222, second sub-filler;

[0028] 300, stator assembly; 310, stator; 311, first sub-stator; 312, second sub-stator; 320, first armature winding; 330, first restraining member; 340, second restraining member; 350, first magnetic bearing; 351, first ring body; 3511, first tooth; 352, second armature winding; 360, second magnetic bearing; 361, second ring body; 3611, second tooth; 362, third armature winding. DETAILED DESCRIPTION

[0029] In order to make the above objectives, features and advantages of the present application more clear and easily understood, the specific embodiments of the present application will be described in detail below with the accompanying drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application. However, the present application can be practiced in a number of different ways from those described herein without departing from the scope of the present application, and it is understood that similar improvements can be made by those skilled in the art without departing from the spirit of the present application, and therefore the present application is not limited to the specific embodiments disclosed below.

[0030] In the description of the present application, it should be understood that if there are terms such as "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. appear, these terms indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the purpose of facilitating the description of the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0031] In addition, if the terms "first", "second" appear, these terms are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features referred to. Therefore, the features defined with "first", "second" can explicitly or implicitly include at least one of the features. In the description of the present application, if the term "plurality" appears, the meaning of "plurality" is at least two, for example, two, three, etc., unless otherwise specifically limited.

[0032] In the present application, unless specifically defined otherwise and limited, if there are terms such as "mount", "connect", "connect", "fix", etc., these terms should be broadly understood. For example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two elements or the interaction relationship between two elements, unless otherwise specifically limited. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0033] In the present application, unless specifically defined otherwise and limited, if there are similar descriptions such as "first feature on" or "second feature", the meaning can be that the first and second features are in direct contact, or the first and second features are indirectly in contact through an intermediate medium. Moreover, the first feature "above", "above" and "above" of the second feature can be directly above or obliquely above the first feature, or only indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature "below", "below" and "below" of the second feature can be directly below or obliquely below the first feature, or only indicates that the horizontal height of the first feature is less than that of the second feature.

[0034] It should be noted that if an element is referred to as "fixed to" or "provided to" another element, it can be directly on another element or there can be a middle element. If an element is considered to be "connected" to another element, it can be directly connected to another element or there can be a middle element. If present, the terms "vertical", "horizontal", "up", "down", "left", "right" and similar expressions used in the present application are for illustrative purposes only and are not the only embodiment.

[0035] Referring to Figure 1 and Figure 2 , a structure diagram of an inductor motor in an embodiment of the present application is shown, which includes a shell 100, a rotor assembly 200 and a stator assembly 300. The shell 100 includes a shell body 110, a first end cover 120 and a second end cover 130. The shell body 110 is provided with a receiving cavity 100A. The first end cover 120 is provided on one end of the shell body 110, and the second end cover 130 is provided on the other end of the shell body 110.

[0036] The rotor assembly 200 includes a rotor 210 and a filler 220. The rotor 210 is rotatably arranged in the receiving cavity 100A. The side surface of the rotor 210 is provided with a groove 210A, so that the convex pole is formed between the grooves 210A. The filler 220 is installed in the groove 210A.

[0037] The stator assembly 300 comprises a stator 310 and a first armature winding 320, the stator 310 is arranged on the inner side wall of the housing body 110, and the stator 310 is arranged around the rotor 210 at intervals, and the first armature winding 320 is installed on the stator 310.

[0038] The inductor motor described in the embodiment of the present application is arranged with the rotatable rotor assembly 200 in the accommodating cavity 100A of the housing 100, and the stator assembly 300 is arranged around the circumference of the rotor assembly 200, and the magnetic field generated by the stator assembly 300 drives the rotor 210 to rotate.

[0039] The inductor motor described in the embodiment of the present application is arranged with the rotatable rotor assembly 200 in the accommodating cavity 100A of the housing 100, and the stator assembly 300 is arranged around the circumference of the rotor assembly 200, and the magnetic field generated by the stator assembly 300 drives the rotor 210 to rotate.

[0040] In combination with Figure 3 and Figure 4 , a structure schematic diagram of the rotor assembly 200 of the inductor motor in an embodiment of the present application is shown, in some embodiments, the groove 210A comprises a plurality of first sub-grooves 211A and a plurality of second sub-grooves 212A, the plurality of first sub-grooves 211A are arranged at one end of the rotor 210 around the circumference of the rotor 210, so that a plurality of first salient poles 213 are formed at the one end of the rotor 210 along the circumference, and the plurality of second sub-grooves 212A are arranged at the other end of the rotor 210 around the circumference of the rotor 210, so that a plurality of second salient poles 214 are formed at the other end of the rotor 210 along the circumference. The filler 220 comprises a plurality of first sub-fillers 221 and a plurality of second sub-fillers 222, the first sub-fillers 221 are arranged one by one in the first sub-grooves 211A, and the second sub-fillers 222 are arranged one by one in the second sub-grooves 212A.

[0041] The first sub-groove 211A is arranged at one end of the rotor 210 to form the first salient pole 213, and the second sub-groove 212A is arranged at the other end of the rotor 210 to form the second salient pole 214, and the corresponding first sub-filler 221 is filled in the first sub-groove 211A, and the corresponding second sub-filler 222 is filled in the second sub-groove 212A, so that the first salient pole 213 and the second salient pole 214 can independently regulate the magnetic field at both ends of the rotor 210 to adapt to the wide operating torque demand, and can also reduce the stray magnetic flux and eddy current loss by means of the non-magnetic first sub-filler 221 and the second sub-filler 222, and improve the efficiency of the inductor motor. At the same time, the first sub-filler 221 and the second sub-filler 222 can eliminate the stress concentration of the first sub-groove 211A and the second sub-groove 212A, stabilize the silicon steel sheet structure of the rotor 210, strengthen the centrifugal resistance of the rotor 210 to adapt to high-speed operation, make the inductor motor more suitable for the application scene of the high-precision, high-speed and high-reliability flywheel energy storage device, and significantly improve the comprehensive performance.

[0042] In an exemplary embodiment, the shell 100 is made of structural steel material, and the rotor 210 is made of structural steel.

[0043] In an exemplary embodiment, the material of the first sub-filler 221 and the material of the second sub-filler 222 are both non-magnetic and non-conductive materials, which can effectively prevent the stator assembly 300 from having serious magnetic flux leakage.

[0044] In an alternative embodiment, as shown in Figure 3 The electrical angle between the first salient pole 213 and the second salient pole 214 is 180 degrees. The 180-degree electrical angle dislocation of the first salient pole 213 and the second salient pole 214 can make the magnetic resistance change of the salient poles at both ends of the rotor 210 form a complementary effect. When the salient pole at one end aligns with the minimum air gap magnetic resistance of the stator 310, the salient pole at the other end aligns with the maximum air gap magnetic resistance of the stator 310, avoiding the torque fluctuation caused by the extreme value of the magnetic resistance at both ends, and can significantly suppress the torque and torque pulsation of the stator 310, reduce the motor running vibration and noise. At the same time, the dislocation of the first salient pole 213 and the second salient pole 214 makes the air gap magnetic flux change alternately and continuously, improves the magnetic flux utilization rate, indirectly enhances the torque density and output stability, and improves the running smoothness and electromagnetic performance.

[0045] In an alternative embodiment, as shown in Figure 2 The stator assembly 300 further includes a first magnetic bearing 350 and a second magnetic bearing 360, and the first magnetic bearing 350 and the second magnetic bearing 360 are arranged in the accommodating cavity 100A, one end of the rotor 210 passes through the first magnetic bearing 350, and the other end of the rotor 210 passes through the second magnetic bearing 360.

[0046] The first magnetic bearing 350 and the second magnetic bearing 360 are arranged at both ends of the accommodating cavity 100A and sleeved with both ends of the rotor 210, so that the rotor 210 is provided with non-contact bidirectional stable support. On the one hand, the magnetic field generated by the first magnetic bearing 350 and the second magnetic bearing 360 can eliminate the gravity friction and wear of the traditional mechanical bearing, greatly reduce the mechanical loss and maintenance requirement of the rotor 210, and avoid vibration noise caused by friction, which is suitable for the high-speed operation scene of the flywheel energy storage device. On the other hand, the first magnetic bearing 350 and the second magnetic bearing 360 can cooperatively control the radial displacement of the rotor 210, accurately maintain the uniformity of the air gap between the rotor 210 and the stator 310, and prevent the magnetic flux from being disturbed due to the eccentricity of the rotor 210, so as to guarantee the stability of the magnetic circuit and improve the torque output precision, and have the comprehensive advantages of low energy consumption, high stability and long service life.

[0047] In an optional embodiment, as shown in Figure 5 and Figure 6 , the first magnetic bearing 350 comprises a first ring body 351 and a second armature winding 352, and four first teeth 3511 are arranged at the inner side of the first ring body 351 and extend along the axial direction of the rotor 210, and the second armature winding 352 is wound on the first teeth 3511. The second magnetic bearing 360 comprises a second ring body 361 and a third armature winding 362, and four second teeth 3611 are arranged at the inner side of the second ring body 361 and extend along the axial direction of the rotor 210, and the third armature winding 362 is wound on the second teeth 3611.

[0048] In the embodiment, the second armature winding 352 is wound on the first teeth 3511 of the first ring body 351, and the third armature winding 362 is wound on the second teeth 3611 of the second ring body 361, so that multi-dimensional optimization can be realized. The four first teeth 3511 and the second teeth 3611 can form independent electromagnetic control units corresponding to the four directions of the rotor 210, accurately adjust the electromagnetic force in each direction, effectively correct the radial displacement of the rotor 210, ensure the uniformity of the stator-rotor air gap, and avoid magnetic flux disturbance. The first teeth 3511 are wound with the third armature winding 362, and the second teeth 3611 are wound with the third armature winding 362, so that the magnetic flux can be concentrated in the area of the first teeth 3511 and the second teeth 3611, the magnetic flux loss is reduced, the electromagnetic force utilization efficiency is improved, the first magnetic bearing 350 and the second magnetic bearing 360 can realize stable suspension with lower excitation current, and the first magnetic bearing 350 and the second magnetic bearing 360 have high-precision positioning capability and high-efficiency characteristics.

[0049] In an optional embodiment, as shown in Figure 2 , the first teeth 3511 and the second teeth 3611 are arranged at an interval of 45 degrees in the circumferential direction of the rotor 210.

[0050] The present embodiment can achieve multiple optimizations by allowing the first magnetic bearing 350 and the second magnetic bearing 360 to be 45 degrees offset, precisely matching the 90-degree electrical angle difference between the first salient pole 213 and the second salient pole 214 of the rotor 210. Specifically, the electromagnetic force regulation rhythm of the first magnetic bearing 350 and the second magnetic bearing 360 precisely cooperates with the change of the air gap magnetic flux at both ends of the rotor 210, avoiding the support force lag caused by the control of the first magnetic bearing 350 and the second magnetic bearing 360 and the magnetic flux fluctuation offset, ensuring the rapid correction of the radial deviation of the rotor 210, and having better operation stability, control accuracy, and energy consumption performance.

[0051] In an optional embodiment, as shown in Figures 2 to 4 The rotor assembly 200 further includes a first suppression member 330 and a second suppression member 340. One end of the rotor 210 is provided with a first mounting boss 215, and the first suppression member 330 is mounted on the first mounting boss 215. The other end of the rotor 210 is provided with a second mounting boss 216, and the second suppression member 340 is mounted on the second mounting boss 216. The first suppression member 330 is mounted on the inner side of the first magnetic bearing 350, and the second suppression member 340 is mounted on the inner side of the first magnetic bearing 350. Specifically, the first suppression member 330 and the second suppression member 340 are made of silicon steel sheet material.

[0052] The present embodiment solves the problem of eddy current loss of the rotor 210 caused by the change of the air gap magnetic flux of the first magnetic bearing 350 and the first magnetic bearing 350 by providing the first mounting boss 215 and the second mounting boss 216 at both ends of the rotor 210, and mounting the first suppression member 330 and the second suppression member 340 at both ends of the rotor 210. The high magnetic permeability of the silicon steel sheet used in the first suppression member 330 and the second suppression member 340 can concentrate and constrain the magnetic flux inside the first suppression member 330 and the second suppression member 340, reducing the stray magnetic flux dispersed to the main body of the rotor 210. The lamination insulation structure can also cut off the eddy current circuit, greatly reducing the eddy current loss in the regions of the first mounting boss 215 and the second mounting boss 216 at both ends, and avoiding local overheating of the rotor. Therefore, the first suppression member 330 and the second suppression member 340 can reduce energy consumption and improve the efficiency of the inductor motor, while ensuring the operation stability and service life of the rotor 210.

[0053] In an optional embodiment, as shown in Figure 2 The stator 310 includes a first sub-stator 311 and a second sub-stator 312. The first sub-stator 311 is arranged along the circumference of the first sub-filler 221, and the second sub-stator 312 is arranged along the circumference of the second sub-filler 222. The housing 100 further includes a permanent magnet 160, which is embedded in the housing body 110 and arranged between the first sub-stator 311 and the second sub-stator 312.

[0054] The first sub-stator 311 and the second sub-stator 312 can be precisely matched with the first salient pole 213 and the second salient pole 214 of the rotor 210 respectively, and can control the air gap magnetic field at both ends in a targeted manner, adapt to the magnetic field modulation requirement of the concave-convex structure of the rotor 210, and improve the torque output precision. The permanent magnet 160 in the middle can provide a constant bias magnetic flux, reduce the excitation current of the first sub-stator 311 and the second sub-stator 312, greatly reduce the copper loss and energy consumption, and at the same time, enhance the air gap flux density and stability, avoid torque pulsation caused by magnetic flux fluctuation. The layout of the permanent magnet 160 embedded in the shell body 110 and located between the first sub-stator 311 and the second sub-stator 312 can shorten the magnetic flux path, reduce the magnetic flux loss, optimize the overall magnetic circuit continuity, and also assist the first magnetic bearing 350 and the second magnetic bearing 360 to maintain the magnetic field stability when the rotor 210 is suspended, further suppress vibration, have low energy consumption, high torque density and stable operation, and at the same time, simplify the winding control logic of the stator 310, improve the system integration and reliability.

[0055] In an optional embodiment, as shown in Figure 2 The shell 100 further includes a first bearing 140 and a second bearing 150, the first end cover 120 is provided with a first mounting groove 120A, the first bearing 140 is mounted in the first mounting groove 120A, one end of the rotor 210 is provided with a first connecting part 217, the first connecting part 217 is mounted in the first bearing 140, the second end cover 130 is provided with a second mounting groove 130A, the second bearing 150 is mounted in the second mounting groove 130A, the other end of the rotor 210 is provided with a second connecting part 218, and the second connecting part 218 is mounted in the second bearing 150. By arranging the first bearing 140 and the second bearing 150 on the first end cover 120 and the second end cover 130 respectively, the first connecting part 217 and the second connecting part 218 at both ends of the rotor 210 are mounted in the first bearing 140 and the second bearing 150 respectively, so that the axial displacement of the rotor 210 is prevented, and the mechanical friction loss of the induction sub-motor is effectively inhibited.

[0056] On the other hand, the application also provides a flywheel energy storage device, which includes the induction sub-motor of any one of the above embodiments.

[0057] The flywheel energy storage device provided by the embodiments of the present application converts energy through an inductor motor, and the rotor 210 of the inductor motor is provided with a groove 210A forming a salient pole. In order to avoid large wind friction loss of the groove 210A during rotation of the rotor 210, a filler 220 is installed in the groove 210A, so that the main body of the rotor 210 is in a cylindrical structure, and the surface is smoother. When the inductor motor is in a high-speed rotating state, on the one hand, the weight of the filler 220 can effectively increase the moment of inertia of the rotor 210, and improve the efficiency of the inductor motor, and on the other hand, the filler 220 can effectively suppress wind friction loss, and has the advantages of low loss and high efficiency.

[0058] The technical features of the above-described embodiments can be combined in any manner. In order to make the description simple, all possible combinations of the technical features in the above-described embodiments are not described, but as long as the combinations of the technical features do not exist contradictory, they should be considered as the scope of the present disclosure.

[0059] The above-described embodiments only express several implementation manners of the present application, and the description is more specific and detailed, but it should not be understood as a limitation on the patent scope of the present application. It should be pointed out that for ordinary skilled in the art, without departing from the concept of the present application, a number of modifications and improvements can be made, which are all within the protection scope of the present application. Therefore, the patent protection scope of the present application should be subject to the appended claims.

Claims

1. An induction motor, characterized in that, include: The housing (100) includes an outer shell body (110), a first end cap (120), and a second end cap (130). The outer shell body (110) has a receiving cavity (100A). The first end cap (120) is disposed on one end of the outer shell body (110), and the second end cap (130) is disposed on the other end of the outer shell body (110). A rotor assembly (200) includes a rotor (210) and a filler (220). The rotor (210) is rotatably disposed within the receiving cavity (100A). The rotor (210) has grooves (210A) on its side to form convex poles between the grooves (210A). The filler (220) is installed in the grooves (210A). The grooves (210A) include a plurality of first sub-grooves (211A) and a plurality of second sub-grooves (212A). The plurality of first sub-grooves (211A) are arranged circumferentially around the rotor (210) at one end of the rotor (210) so that one end of the rotor (210) is circumferentially... Multiple first salient poles (213) are formed, and multiple second sub-grooves (212A) are arranged around the rotor (210) at the other end of the rotor (210) in the circumferential direction, so that multiple second salient poles (214) are formed at the other end of the rotor (210) in the circumferential direction; the electrical angle between the first salient poles (213) and the second salient poles (214) differs by 180 degrees; the filler (220) includes multiple first sub-fillers (221) and multiple second sub-fillers (222), the first sub-fillers (221) are arranged one-to-one in the first sub-grooves (211A), and the second sub-fillers (222) are arranged one-to-one in the second sub-grooves (212A). A stator assembly (300) includes a stator (310) and a first armature winding (320). The stator (310) is disposed on the inner sidewall of the housing body (110) and is arranged around the rotor (210) at intervals. The first armature winding (320) is mounted on the stator (310). The stator assembly (300) also includes a first magnetic bearing (350) and a second magnetic bearing (360). The first magnetic bearing (350) is provided with a first tooth (3511), and the second magnetic bearing (360) is provided with a second tooth (3611). The first tooth (3511) and the second tooth (3611) are arranged at 45-degree intervals in the circumferential direction of the rotor (210).

2. The induction motor according to claim 1, characterized in that: The shell (100) is made of structural steel, and the rotor (210) is made of structural steel.

3. The induction motor according to claim 1, characterized in that: Both the first sub-filler (221) and the second sub-filler (222) are made of non-magnetic and non-conductive materials.

4. The induction sub-motor according to claim 1, characterized in that: The first magnetic bearing (350) and the second magnetic bearing (360) are both disposed in the receiving cavity (100A), one end of the rotor (210) passes through the first magnetic bearing (350), and the other end of the rotor (210) passes through the second magnetic bearing (360).

5. The induction sub-motor according to claim 4, characterized in that: The rotor assembly (200) further includes a first suppressor (330) and a second suppressor (340). One end of the rotor (210) is provided with a first mounting boss (215), and the first suppressor (330) is mounted on the first mounting boss (215). The other end of the rotor (210) is provided with a second mounting boss (216), and the second suppressor (340) is mounted on the second mounting boss (216).

6. The induction sub-motor according to claim 4, characterized in that: The first magnetic bearing (350) includes a first ring body (351) and a second armature winding (352). Four first teeth (3511) are spaced apart on the inner side of the first ring body (351). The first teeth (3511) extend along the axial direction of the rotor (210). The second armature winding (352) is wound around the first teeth (3511). The second magnetic bearing (360) includes a second ring body (361) and a third armature winding (362). Four second teeth (3611) are spaced apart on the inner side of the second ring body (361). The second teeth (3611) extend along the axial direction of the rotor (210). The third armature winding (362) is wound around the second teeth (3611).

7. The induction sub-motor according to claim 5, characterized in that: The first suppressor (330) and the second suppressor (340) are made of silicon steel sheet material.

8. The induction motor according to claim 1, characterized in that: The stator (310) includes a first sub-stator (311) and a second sub-stator (312). The first sub-stator (311) is arranged circumferentially along the first sub-filler (221), and the second sub-stator (312) is arranged circumferentially along the second sub-filler (222). The housing (100) also includes a permanent magnet (160), which is embedded in the housing body (110) and disposed between the first sub-stator (311) and the second sub-stator (312).

9. The induction motor according to any one of claims 1-7, characterized in that: The housing (100) further includes a first bearing (140) and a second bearing (150). The first end cover (120) is provided with a first mounting groove (120A), and the first bearing (140) is mounted in the first mounting groove (120A). One end of the rotor (210) is provided with a first connecting part (217), and the first connecting part (217) is mounted in the first bearing (140). The second end cover (130) is provided with a second mounting groove (130A), and the second bearing (150) is mounted in the second mounting groove (130A). The other end of the rotor (210) is provided with a second connecting part (218), and the second connecting part (218) is mounted in the second bearing (150).

10. A flywheel energy storage device, characterized in that: Including the induction motor as described in any one of claims 1-9.

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