Stator coreless flywheel energy storage motor

Abstract

This invention discloses a stator coreless flywheel energy storage motor, belonging to the field of energy storage technology. It includes an upper end cover, a permanent magnet unloading bearing, an upper rotor, an armature winding, a flywheel rotor, and a lower end cover arranged sequentially from top to bottom along the axial direction. It also includes a shaft connecting the upper rotor and the flywheel rotor, a first rotor core and a first permanent magnet block mounted on the upper surface of the flywheel rotor, and a second rotor core and a second permanent magnet block mounted on the lower surface of the upper rotor. The magnetization directions of the first and second permanent magnet blocks are both axial but opposite. The permanent magnet unloading bearing includes a permanent magnet ring, which is magnetized axially downwards to provide axial levitation force to the upper rotor. This invention achieves decoupling of power and energy storage, and of the levitation magnetic circuit and excitation magnetic circuit, effectively reducing stator iron loss and rotor eddy current loss, and improving the stability of the levitation force. The system has a compact structure, high energy storage density, and high power density.

Description

Technical Field

[0001] This invention belongs to the field of electrical energy storage technology, and more specifically, relates to a stator coreless flywheel energy storage motor. Background Technology

[0002] Among various energy storage methods, flywheel energy storage stores electrical energy in the form of mechanical energy. It has advantages such as high power density, fast response speed, environmental friendliness, unlimited charge and discharge cycles, and long lifespan, and has great development potential and application prospects.

[0003] As the core component of a flywheel energy storage system, the performance of the flywheel energy storage motor is crucial. Axial flux permanent magnet motors, combining the advantages of both permanent magnet motors and axial flux motors (high efficiency, high power factor, compact structure, and short axial length), are often a primary choice for flywheel energy storage motors. To reduce bearing losses, flywheel energy storage systems typically require a magnetic bearing system. Existing magnetic bearing systems generally consist of multiple radial and axial magnetic bearings, which not only complicates the system structure, reduces integration, and increases cost, but also, because the motor rotor serves as both the energy storage flywheel and rotor, there is a strong coupling between its power and the stored energy, creating a constraint between them. This prevents a free match between power and stored energy, affecting the applicability and versatility of the flywheel energy storage system.

[0004] Meanwhile, for motors with flywheel rotor structures, magnetic bearings are often used for direct levitation. This means that the magnetic circuit of the permanent magnet ring passes through both the flywheel and the motor, resulting in drawbacks such as high magnetic leakage and poor levitation stability. Existing technology discloses a stator shaft radial excitation flywheel energy storage motor that uses a permanent magnet ring on the upper end cover to generate an axially upward levitation force. This causes the magnetic circuit of the levitation permanent magnet to pass through both the axial air gap and the radial main air gap, while the magnetic circuit of the excitation winding only passes through the radial air gap, not the axial air gap. However, since both the magnetic circuit of the levitation permanent magnet and the magnetic circuit of the excitation winding pass through the radial air gap, the motor's magnetic circuit is more prone to saturation, leading to a decrease in the permeability of the stator and rotor cores, which in turn affects the stability of the permanent magnet bearing's levitation force. Summary of the Invention

[0005] In response to the deficiencies and improvement needs of existing technologies, this invention provides a stator coreless flywheel energy storage motor, the purpose of which is to improve the stability of the levitation force of the permanent magnet bearing in the flywheel energy storage motor.

[0006] To achieve the above objectives, the present invention provides a stator coreless flywheel energy storage motor, comprising an upper end cover, a permanent magnet unloading bearing, an upper rotor, an armature winding, a flywheel rotor, and a lower end cover arranged sequentially from top to bottom along the axial direction; and further comprising a housing fixed between the upper end cover and the lower end cover and surrounding the flywheel rotor and the upper rotor. It also includes an upper rotating shaft connecting the upper rotor and a lower rotating shaft connecting the flywheel rotor, a first rotor core and a first permanent magnet block installed on the upper surface of the flywheel rotor, and a second rotor core and a second permanent magnet block installed on the lower surface of the upper rotor; the magnetization directions of the first permanent magnet block and the second permanent magnet block are both axial directions but opposite. The permanent magnet unloading bearing includes a permanent magnet ring, which is magnetized axially downwards to provide axial levitation force for the upper rotor; The permanent magnet unloading bearing also includes: a ferromagnetic ring and a permanent magnet bearing yoke; The upper end face of the permanent magnet bearing yoke is fixed on the upper end cover. One lower end face of the permanent magnet bearing yoke, the permanent magnet ring, and the ferromagnetic ring are in sequential contact, and the ferromagnetic ring and the upper rotor form an axial air gap. The other lower end face of the permanent magnet bearing yoke forms an axial air gap with the upper rotor. The armature winding is fixed to the housing by a winding support frame made of non-ferromagnetic material; M fan-shaped annular grooves are evenly spaced and staggered on the upper surface of the first rotor core and the lower surface of the second rotor core, where M≥1, and the mechanical angle between the staggered fan-shaped annular grooves is 180° / M. The first permanent magnet block is disposed in the annular groove on the upper surface of the first rotor core; the second permanent magnet block is disposed in the annular groove on the lower surface of the second rotor core.

[0007] Furthermore, the armature winding includes N sector-shaped module windings, where N ≥ 2.

[0008] Furthermore, the upper rotating shaft and the upper rotor are an integrated structure, and the lower rotating shaft is connected to the lower part of the flywheel rotor by a heat-shrink fitting.

[0009] Furthermore, it also includes an upper bearing seat located at the center of the upper end cover, which contains an upper bearing that supports the upper rotating shaft; And a lower bearing seat located at the center of the lower end cover, wherein a lower bearing supporting the lower rotating shaft is provided inside.

[0010] Furthermore, the housing includes an upper housing and a lower housing, the upper housing and the upper end cover are integrally cast together, and the lower housing and the lower end cover are integrally cast together.

[0011] Furthermore, an embedded tube is provided on the outside of the armature winding, and the embedded tube is used to pass liquid to cool the armature winding.

[0012] Furthermore, the upper end cover, lower end cover, housing, flywheel rotor, upper rotor, upper shaft, and lower shaft are all made of ferromagnetic materials; The first rotor core and the second rotor core are made of silicon steel sheets or soft magnetic composite materials.

[0013] In summary, the above-described technical solutions conceived in this invention can achieve the following beneficial effects: (1) The stator coreless flywheel energy storage motor of the present invention, by setting the permanent magnet unloading bearing between the upper end cover and the upper rotor, the permanent magnet of the permanent magnet unloading bearing is axially magnetized downward to generate axial levitation force to levitate the upper rotor. The upper rotor is connected to the flywheel rotor, and the flywheel rotor is indirectly levitated by the upper rotor as an axial suction disk. The magnetic circuit of the levitation permanent magnet is mainly through the axial air gap between the permanent magnet unloading bearing and the upper surface of the upper rotor. The two rotors of the motor (the first rotor core, the first permanent magnet block, the second rotor core and the second permanent magnet block) are respectively embedded in the flywheel rotor and the upper rotor. The magnetic circuit of the excitation winding is mainly through the axial air gap between the first permanent magnet block and the second rotor core, so that the levitation magnetic circuit and the excitation magnetic circuit are completely independent. The magnetic flux of the motor permanent magnet and the armature reaction will not affect the levitation magnetic flux, thus improving the stability of the permanent magnet bearing levitation.

[0014] Furthermore, the motor's two rotors are embedded in the flywheel rotor and the upper rotor respectively, separating the motor rotor from the energy storage flywheel and decoupling power and energy storage. Simultaneously, because there are rotors at both ends, changes in the stator armature winding current do not affect the magnitude of the axial force.

[0015] (2) Further, the permanent magnet unloading bearing designed in this invention has two end faces, and a groove structure is naturally formed between the two end faces, so that the magnetic circuit of the suspended permanent magnet is closed on one side, which allows the magnetic circuit of the suspended permanent magnet to pass only through the axial air gap between the ferromagnetic ring and the upper surface of the upper rotor; at the same time, one lower end face of the permanent magnet bearing yoke, the permanent magnet ring and the ferromagnetic ring are in contact in sequence, and the permanent magnet ring is not in direct contact with the axial air gap, which can also protect the permanent magnet ring.

[0016] (3) The flywheel energy storage motor of the present invention has a dual rotor structure. The upper rotor, which serves as both the rotor carrier and the axial suction disk, makes the rotor structure of the present invention different from the traditional simple rotor structure. The upper rotor and the flywheel rotor are first interference-fitted and then the armature winding is placed in. However, the space between the upper rotor and the flywheel rotor is narrow, and the armature winding cannot be fixed by the traditional manual winding, shaping, unwinding and pouring methods. The present invention uses modular armature windings, which can place each modular armature winding from the side between the upper rotor and the flywheel rotor, and also simplifies the winding processing technology.

[0017] (4) Furthermore, by fixing the armature winding to the housing through a winding support frame made of non-ferromagnetic material with a solidification effect, the stator can be prevented from participating in the magnetic path. Compared with the existing structure where the winding is fixed to the stator teeth by ferromagnetic material and participates in the magnetic path, the structure of the present invention does not have a stator core, which can avoid stator iron loss and rotor eddy current loss, thereby reducing the self-discharge rate of the flywheel energy storage system, improving energy storage efficiency, and reducing the difficulty of heat dissipation.

[0018] (5) Preferably, the first rotor core and the second rotor core are symmetrically staggered and the staggered angle is uniform, so that the axial suspension bearing will not generate unbalanced axial electromagnetic force, thereby further ensuring stable axial suspension force, and reducing the impact load and bearing wear on the mechanical bearing, thus improving the bearing life; at the same time, it can also reduce the amount of permanent magnets used, save costs, and improve the output torque and field weakening speed expansion capability of the motor.

[0019] (6) Preferably, the upper rotor and the upper shaft are integrated structures, which can avoid the problem of large stress at the interference fit.

[0020] (7) Preferably, a pre-embedded tube is provided outside the armature winding, and the armature winding is cooled by passing liquid through the pre-embedded tube to reduce the difficulty of heat dissipation.

[0021] (8) Preferably, the rotor core material is silicon steel sheet or soft magnetic composite material, which can effectively reduce rotor eddy current loss.

[0022] In summary, the flywheel energy storage motor of the present invention, through its design, uses the upper rotor as both the motor rotor carrier and, in conjunction with the permanent magnet unloading bearing, as an axial suction disk to indirectly suspend the flywheel rotor and unload the axial force of the entire rotor. This achieves complete decoupling of the suspension magnetic circuit and the excitation magnetic circuit, as well as complete decoupling of power and energy storage, thereby improving the stability of the permanent magnet bearing suspension and the dynamic performance of the rotor. Attached Figure Description

[0023] Figure 1 This is a half-sectional schematic diagram of the stator coreless flywheel energy storage motor in an embodiment of the present invention.

[0024] Figure 2 This is a schematic diagram of the rotor core and permanent magnet block in an embodiment of the present invention.

[0025] Figure 3 This is a schematic diagram of a modular armature winding according to an embodiment of the invention.

[0026] Figure 4 This is a schematic diagram of the flux paths of the levitation flux and the main excitation flux in an embodiment of the present invention.

[0027] In all the accompanying drawings, the same reference numerals are used to denote the same elements or structures, wherein: 1-Flywheel rotor, 2-First rotor core, 3-First permanent magnet block, 4-Second rotor core, 5-Second permanent magnet block, 61-Upper rotor, 62-Upper shaft, 7-Lower shaft, 81-Upper bearing housing, 82-Lower bearing housing, 91-Upper bearing, 92-Lower bearing, 101-Ferromagnetic ring, 102-Permanent magnet ring, 103-Permanent magnet bearing yoke, 111-Upper end cover, 112-Lower end cover, 121-Armature winding, 122-Winding support frame, 131-Upper housing, 132-Lower housing. Detailed Implementation

[0028] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention. Furthermore, the technical features involved in the various embodiments of this invention described below can be combined with each other as long as they do not conflict with each other.

[0029] In this invention, the terms "first," "second," etc., used in the invention and accompanying drawings are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence.

[0030] See Figure 1 , combined Figures 2-4 The stator coreless flywheel energy storage motor in this embodiment will be described in detail.

[0031] The stator coreless flywheel energy storage motor of the present invention mainly includes: an upper end cover 111, a permanent magnet unloading bearing, an upper rotor 61, an armature winding 121, a flywheel rotor 1, a lower end cover 112, a first rotor core 2, a first permanent magnet block 3, a second rotor core 4, a second permanent magnet block 5, and a housing. Among them, the upper end cover 111, permanent magnet unloading bearing, upper rotor 61, armature winding 121, flywheel rotor 1 and lower end cover 112 are arranged sequentially from top to bottom along the axial direction; It also includes an upper rotating shaft 62 connecting the upper rotor 61 and a lower rotating shaft 7 connecting the flywheel rotor 1; the first rotor core 2 and the first permanent magnet block 3 are installed on the upper surface of the flywheel rotor 1, and the second rotor core 4 and the second permanent magnet block 5 are installed on the lower surface of the upper rotor 61; the magnetization direction of the first permanent magnet block 3 and the second permanent magnet block 5 is axial and opposite. The permanent magnet unloading bearing includes a permanent magnet ring 102, which is magnetized axially downward to provide axial levitation force to the upper rotor 61, thereby achieving indirect axial levitation of the flywheel rotor 1.

[0032] The housing is fixed between the upper end cover 111 and the lower end cover 112, and surrounds the outside of the flywheel rotor 1 and the upper rotor 61.

[0033] Specifically, the permanent magnet unloading bearing also includes a ferromagnetic ring 101 and a permanent magnet bearing yoke 103; the upper end face of the permanent magnet bearing yoke 103 is fixed on the upper end cover 111, one lower end face of the permanent magnet bearing yoke 103 is in contact with the upper surface of the permanent magnet ring 102, the lower surface of the permanent magnet ring 102 is in contact with the upper surface of the ferromagnetic ring 101, the ferromagnetic ring 101 and the upper rotor 61 form an axial air gap, and at the same time, the other lower end face of the permanent magnet bearing yoke 103 forms an axial air gap with the upper rotor 61.

[0034] Specifically, the armature winding 121 is installed between the flywheel rotor 1 and the upper rotor 61 and is fixed to the housing by the winding support frame 122; the housing includes an upper housing 131 and a lower housing 132, which are respectively fixed between the upper end cover 111 and the lower end cover 112 and surround the outside of the flywheel rotor 1 and the upper rotor 61; wherein, the winding support frame 122 is made of a non-magnetic material with a solidification effect.

[0035] As a preferred option, the upper end cover 111 and the upper housing 131 are integrally cast, and the lower end cover 112 and the lower housing 132 are integrally cast, thus reducing the difficulty of the process.

[0036] Specifically, the upper rotating shaft 62 and the upper rotor 61 are an integrated structure, and the lower rotating shaft 7 is connected to the flywheel rotor 1 below by a heat-shrink fitting; wherein, the flywheel rotor 1 and the lower rotating shaft 7 are connected by an interference fit.

[0037] It also includes: an upper bearing housing 81, an upper bearing 91, a lower bearing housing 82 and a lower bearing 92. The upper bearing 91 is disposed in the upper bearing housing 81 and is used to support and protect the upper rotating shaft 62. The lower bearing 92 is disposed in the lower bearing housing 82 and is used to support and protect the lower rotating shaft 7. The upper bearing housing 81 is installed at the center of the upper end cover 111 and the lower bearing housing 82 is installed at the center of the lower end cover 112.

[0038] Specifically, the flywheel rotor 1 is vertically mounted, and the upper housing 131 and the lower housing 132 serve as protective shells and support structures.

[0039] Specifically, such as Figure 2As shown, the first rotor core 2 is installed in the annular groove on the upper surface of the flywheel rotor 1; the second rotor core 4 is installed in the annular groove on the lower surface of the upper rotor 61; M fan-shaped annular grooves are evenly spaced on the upper surface of the first rotor core 2 and the lower surface of the second rotor core 4, and the fan-shaped annular grooves on the first rotor core 2 and the second rotor core 4 are staggered, with a mechanical angle of 180° / M, where M≥1. The first permanent magnet block 3 is set in the fan-shaped annular groove on the first rotor core 2, and the second permanent magnet block 5 is set in the fan-shaped annular groove on the second rotor core 4.

[0040] As a preferred option, such as Figure 3 As shown, the armature winding 121 has a modular structure, comprising N identical sector-shaped modular armature windings. Each modular armature winding is fixed to the housing by a winding support frame 142 made of a non-magnetic material with curing properties, such as epoxy resin or phenolic resin, where N ≥ 2. An embedded tube is provided on the outside of the armature winding 121, and liquid is circulated through the embedded tube to cool the armature winding 121.

[0041] Specifically, the upper bearing housing 81 and the lower bearing housing 82 are both made of non-ferromagnetic materials; the upper end cover 111, the lower end cover 112, the upper housing 131, the lower housing 132, the flywheel rotor 1, the upper rotor 61, the upper shaft 62, and the lower shaft 7 are all made of ferromagnetic materials.

[0042] Preferably, the first rotor core 2 and the second rotor core 4 are made of silicon steel sheets or soft magnetic composite materials.

[0043] Specifically, in the stator coreless flywheel energy storage motor of this embodiment, during operation, the permanent magnet ring 102 is magnetized axially downwards, generating an axial levitation force, reducing the axial load on the upper bearing 91 and the lower bearing 92 of the mechanical bearings. Its magnetic flux path is as follows: Figure 4 As shown, the specific path is: permanent magnet ring 102 → ferromagnetic ring 101 → upper surface of upper rotor 61 → permanent magnet bearing yoke 103 → permanent magnet ring 102. That is, the magnetic circuit of permanent magnet ring 102 mainly passes through the axial air gap between ferromagnetic ring 101 and the upper surface of upper rotor 61, thus primarily generating axial levitation force. The second permanent magnet block 5 and the first permanent magnet block 3, which generate excitation, are magnetized axially upwards and downwards, respectively. Their magnetic flux paths are: second permanent magnet block 5 → second rotor core 4 → upper rotor 61 → upper shaft 62 → upper rotor 61 → second rotor core 4 → first permanent magnet block 3 → first rotor core 2 → flywheel rotor 1 → first rotor core 2 → second permanent magnet block 5. That is, the excitation magnetic circuit mainly passes through the axial air gap between the first permanent magnet block 3 and the second rotor core 4. It can be seen that the levitation magnetic circuit and the motor excitation magnetic circuit are independent; therefore, the magnetic flux of the motor permanent magnet and armature reaction basically does not affect the levitation magnetic flux.

[0044] Meanwhile, the symmetrical staggered arrangement between the rotor cores does not generate unbalanced axial electromagnetic forces, thus ensuring stable axial levitation force.

[0045] The stator coreless flywheel energy storage motor of the present invention suspends the upper rotor by placing a permanent magnet unloading bearing between the upper end cover and the upper rotor. The permanent magnets of the permanent magnet unloading bearing are axially magnetized downward to generate axial levitation force to suspend the upper rotor. The upper rotor is connected to the flywheel rotor, and the flywheel rotor is indirectly suspended by the upper rotor as an axial suction disk. The magnetic circuit of the suspending permanent magnet is mainly through the axial air gap between the permanent magnet unloading bearing and the upper surface of the upper rotor. The two rotors of the motor (the first rotor core, the first permanent magnet block, the second rotor core, and the second permanent magnet block) are respectively embedded in the flywheel rotor and the upper rotor. The magnetic circuit of the excitation winding is mainly through the axial air gap between the first permanent magnet block and the second rotor core. Thus, the suspending magnetic circuit and the excitation magnetic circuit are completely independent. The magnetic flux of the motor permanent magnet and the armature reaction does not affect the suspending magnetic flux, thereby improving the stability of the permanent magnet bearing suspension.

[0046] Furthermore, the two rotors of the motor are respectively embedded in the flywheel rotor and the upper rotor, separating the motor rotor and the energy storage flywheel, thereby decoupling power and energy storage.

[0047] Furthermore, through the coordinated design of the upper end cover, permanent magnet unloading bearing, upper rotor, armature winding, flywheel rotor, and lower end cover, the modular armature winding is directly fixed to the housing using a non-magnetic material with a curing effect, and cooled by liquid cooling via pre-embedded pipes. This design ensures the stator does not participate in the magnetic path. Compared to existing structures where the winding is fixed to the stator teeth with ferromagnetic material and participates in the magnetic path, this invention eliminates the stator core, avoiding stator iron loss and rotor eddy current loss. This reduces the self-discharge rate of the flywheel energy storage system, improves energy storage efficiency, and also reduces heat dissipation difficulty.

[0048] The bearing structure designed in this invention is simple, which can make the levitation force more stable, reduce the impact load on the mechanical bearing and bearing wear, and improve the bearing life and the self-discharge rate of the flywheel energy storage system.

[0049] The stator coreless flywheel energy storage motor structure of the present invention integrates the rotor core into the flywheel rotor. Through the design, the upper rotor serves as both the motor rotor carrier and, in conjunction with the permanent magnet unloading bearing, as an axial suction disk to indirectly suspend the flywheel rotor and unload the weight of the entire rotor. This also achieves decoupling of power and energy storage, levitation magnetic circuit and excitation magnetic circuit, simplifies system design, and makes the overall system structure simple and compact, highly integrated, with high energy storage density and high power density.

[0050] Those skilled in the art will readily understand that the above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A stator coreless flywheel energy storage motor, characterized in that, It includes an upper end cover (111), a permanent magnet unloading bearing, an upper rotor (61), an armature winding (121), a flywheel rotor (1), and a lower end cover (112) arranged sequentially from top to bottom along the axial direction; it also includes a housing fixed between the upper end cover (111) and the lower end cover (112) and surrounding the flywheel rotor (1) and the upper rotor (61); It also includes an upper rotating shaft (62) connecting the upper rotor (61) and a lower rotating shaft (7) connecting the flywheel rotor (1), a first rotor core (2) and a first permanent magnet block (3) installed on the upper surface of the flywheel rotor (1), and a second rotor core (4) and a second permanent magnet block (5) installed on the lower surface of the upper rotor (61); the magnetization directions of the first permanent magnet block (3) and the second permanent magnet block (5) are both axial directions and opposite directions; The permanent magnet unloading bearing includes a permanent magnet ring (102), which is magnetized axially downward to provide axial levitation force to the upper rotor (61); The permanent magnet unloading bearing also includes: a ferromagnetic ring (101) and a permanent magnet bearing yoke (103). The upper end face of the permanent magnet bearing yoke (103) is fixed on the upper end cover (111). One lower end face of the permanent magnet bearing yoke (103), the permanent magnet ring (102), and the ferromagnetic ring (101) are in sequential contact, and the ferromagnetic ring (101) and the upper rotor (61) form an axial air gap. The other lower end face of the permanent magnet bearing yoke (103) forms an axial air gap with the upper rotor (61). The armature winding (121) is fixed to the housing by a winding support frame (122) made of non-ferromagnetic material; M fan-shaped annular grooves are provided at equal intervals on the upper surface of the first rotor core (2) and the lower surface of the second rotor core (4), M≥1, and the mechanical angle between the fan-shaped annular grooves is 180° / M. The first permanent magnet block (3) is disposed in the fan-shaped annular groove on the upper surface of the first rotor core (2); the second permanent magnet block (5) is disposed in the fan-shaped annular groove on the lower surface of the second rotor core (4).

2. The stator coreless flywheel energy storage motor according to claim 1, characterized in that, The armature winding (121) includes N sector-shaped module windings, where N ≥ 2.

3. The stator coreless flywheel energy storage motor according to claim 1, characterized in that, The upper rotating shaft (62) and the upper rotor (61) are an integrated structure, and the lower rotating shaft (7) is connected to the lower part of the flywheel rotor (1) by a heat-shrink method.

4. The stator coreless flywheel energy storage motor according to claim 3, characterized in that, It also includes an upper bearing seat (81) located at the center of the upper end cover (111), which has an upper bearing (91) inside that supports the upper rotating shaft (62). And a lower bearing seat (82) located at the center of the lower end cover (112), which has a lower bearing (92) inside that supports the lower rotating shaft (7).

5. The stator coreless flywheel energy storage motor according to claim 1, characterized in that, The housing includes an upper housing (131) and a lower housing (132). The upper housing (131) and the upper end cover (111) are integrally cast together, and the lower housing (132) and the lower end cover (112) are integrally cast together.

6. The stator coreless flywheel energy storage motor according to claim 1, characterized in that, An embedded tube is provided on the outside of the armature winding (121), and the embedded tube is used to cool the armature winding (121) with liquid.

7. The stator coreless flywheel energy storage motor according to claim 1, characterized in that, The upper end cover (111), lower end cover (112), housing, flywheel rotor (1), upper rotor (61), upper shaft (62) and lower shaft (7) are all made of ferromagnetic material; The first rotor core (2) and the second rotor core (4) are made of silicon steel sheets or soft magnetic composite materials.

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