WO2020118819A1

WO2020118819A1 - Electric motor based on double-layer rotor structure, and double-layer energy storage flywheel

Info

Publication number: WO2020118819A1
Application number: PCT/CN2019/070717
Authority: WO
Inventors: 王智洋; 刘杰; 张庆源
Original assignee: 微控物理储能研究开发（深圳）有限公司
Priority date: 2018-12-14
Filing date: 2019-01-07
Publication date: 2020-06-18
Also published as: CN109639035A; CN109639035B

Abstract

Disclosed are an electric motor based on a double-layer rotor structure, and a double-layer energy storage flywheel. The electric motor comprises a mounting shell (10), a stator, an inner rotor (30), and an outer rotor (40). The electric motor can be applied to the double-layer energy storage flywheel, and can also be used as a pure electromotor, a pure power generator or an integrated electromotor and power generation machine, namely, one of the inner rotor and the outer rotor serves as an electromotor, and the other serves as a power generator. The electric motor can be either an electric motor without an iron core or an electric motor with an iron core, and is preferably an electric motor without an iron core. According to the present application, the inner rotor (30) is not physically connected to the outer rotor (40), and the inner rotor (30) and the outer rotor (40) are coupled through the action of a magnetic field, such that the inner rotor (30) and the outer rotor (40) are in linkage with each other.

Description

Electric machine based on double-layer rotor structure and double-layer energy storage flywheel

Technical field

The invention relates to the technical field of motors, in particular to a motor based on a double-layer rotor structure and a double-layer energy storage flywheel.

Background technique

Compared with AC induction motors, permanent magnet motors have higher efficiency, smaller size, more constant torque output and better reliability, which is the development direction of high-speed and high-efficiency motors.

The permanent magnet motor is composed of a rotor and a stator. The excitation magnetic field of the motor is provided by permanent magnets on the rotor. The excitation magnetic field generates a rotating torque through the interaction with the current in the coil on the stator to realize the rotation of the motor. Permanent magnet motors can usually be divided into inner rotor or outer rotor structures. In the inner rotor structure motor, the rotor is in the center of the motor, surrounded by the stator of the outer ring. Usually used in applications requiring higher response bandwidth, such as servo control; the stator of the outer rotor structure motor is at the center of the motor, surrounded by the rotor of the outer ring, which can increase the rotor inertia and make the motor more affected by external load disturbances Small, often used in applications requiring constant speed.

The traditional permanent magnet motor has a stator core structure, and the stator coil is wound on the stator core formed by stacking silicon steel sheets. The magnetic fields of the rotor and stator act on the magnetic circuit formed by the stator core, the air gap of the motor, and the rotor, and the magnetic fields of the two interact to form a rotating torque. Due to the spatial discontinuity of the stator core, the rotor and stator magnetic fields will fluctuate in space, which can be expressed mathematically as a higher-order spectrum signal under Fourier transform.

The traditional ironless motor does not use the stator core structure, the magnetic field is defined by the coil, the air gap of the motor and the magnetic circuit formed by the rotor. Since there is no spatial discontinuity, the rotor and stator magnetic fields are smoother. Therefore, the motor has no cogging torque and no torque fluctuations on the circumference, and the motor control is more stable. The stator has a thinner radial section and a smaller volume. Since there is no stator core, the iron loss is reduced, which can potentially improve the efficiency of the motor. Since the magnetic resistance of the magnetic circuit of the conventional ironless motor is relatively large, it may weaken the magnetic field strength of the rotor and stator under the same conditions, resulting in a reduction in torque.

In the existing permanent magnet ironless motor, no matter the outer rotor structure or the inner rotor structure, the winding coil of the traditional ironless motor does not wrap any metal iron core. By removing the stator core of the traditional permanent magnet motor, the motor’s The distribution of the bias magnetic field and the control magnetic field will be smoother, which greatly reduces the torque ripple of the motor and makes the motor control smoother. In addition, due to the reduction of silicon steel sheets on the magnetic circuit, the hysteresis loss is reduced, which can potentially improve the efficiency of the motor. However, because the stator core of the motor is removed, the reluctance of the magnetic circuit is increased, which will reduce the strength of the magnetic field in the motor, thereby reducing the peak torque of the motor output. Due to the increased reluctance, the stator coil will need to provide more electromagnetic The driving force will increase the heat loss in the motor wires, offset the reduced hysteresis loss, and may eventually reduce the efficiency of the motor. Without the heat dissipation of the iron core, the stator heat may be dissipated nowhere, causing the stator to overheat. .

In view of this, to overcome the above defects in the prior art, providing a new motor based on a double-layer rotor structure and a double-layer energy storage flywheel has become an urgent technical problem in the art.

Summary of the invention

The purpose of the present invention is to provide a motor based on a double-layer rotor structure and a double-layer energy storage flywheel in view of the above defects of the prior art.

The object of the present invention can be achieved by the following technical measures:

The invention provides a motor based on a double-layer rotor structure. The motor includes:

Mounting shell

A stator fixed to the mounting shell, the stator including a stator coil;

An inner rotor rotatably provided inside the mounting shell, an inner rotor field magnet is provided on an outer wall of the inner rotor, and the inner rotor field magnet is located between the inner rotor and the stator coil;

The outer rotor rotatably sleeved on the outside of the mounting shell, an outer rotor field magnet is provided on the inner wall of the outer rotor, and the stator coil is sandwiched between the inner rotor field magnet and the outer rotor field magnet .

Preferably, the mounting shell includes an upper shell and a lower shell, the upper shell and the lower shell cooperate to fix the inner rotor and the outer rotor, and the mounting shell is made of metal or non-metal Made of metal material.

Preferably, the inner rotor and the mounting shell are connected by an inner rotor bearing, and the outer rotor and the mounting shell are connected by an outer rotor bearing.

Preferably, the inner rotor bearing is one or more of rolling bearings, sliding bearings, magnetic bearings and air bearings.

Preferably, the outer rotor bearing is one or more of rolling bearings, sliding bearings, magnetic bearings and air bearings.

Preferably, the stator has no stator core, and the stator further includes a support structure, and the stator coil is fixed to the support structure, and the support structure is made of metal or non-metallic material, or is made of a Or a variety of non-molding materials, including gel, rubber, glass, and resin.

Preferably, the stator may also include a stator core, the stator coil is wound around the stator core, the stator core is sandwiched between the inner rotor field magnet and the outer rotor field magnet, the The stator iron core includes a plurality of iron core laminations, and the plurality of iron core laminations are stacked in the axial direction of the stator iron core.

In the electric machine based on the double-layer rotor structure, both the inner rotor and the outer rotor are generators, or the inner rotor and the outer rotor are electric motors, or the inner rotor and the outer rotor are both One of the rotors is an electric motor, and the other rotor is used in generators.

The invention also provides a double-layer energy storage flywheel including the above motor, the outer rotor is connected to the outer rotor flywheel, the outer rotor flywheel is provided outside the mounting shell, and the inner rotor is connected to the inner rotor flywheel , The inner rotor flywheel is installed inside the mounting shell and installed outside the inner rotor.

Preferably, the mounting shell is formed with a hollow first cavity and a second cavity at the lower end of the first cavity which is integrally communicated with the first cavity, the first cavity and the second cavity The cross-section of the two cavities has an inverted “T” shape, the outer rotor is located outside the first cavity, the inner rotor is installed in the first cavity, and the inner rotor extends from the first cavity One cavity extends to the second cavity.

Preferably, the outer rotor flywheel is sleeved on the outside of the first cavity, and the inner rotor flywheel is accommodated in the second cavity.

The motor of the present invention includes a mounting shell, a stator, an inner rotor, and an outer rotor. There is no physical connection between the inner rotor and the outer rotor of the motor. The inner rotor and the outer rotor are coupled by the action of a magnetic field, so that the inner rotor and the outer rotor are linked to each other. The motor can be applied to the double-layer energy storage flywheel, and can also be used as a pure motor, pure generator or electric and power generation integrated machine (that is, one of the inner rotor and the outer rotor is a motor, and the other rotor is a generator) . The double-layer energy storage flywheel of the present invention has a double-layer rotor structure, which effectively uses space, so that the weight of the flywheel available per unit volume increases, thereby increasing the density of the flywheel's stored energy.

BRIEF DESCRIPTION

FIG. 1 is a schematic diagram of the internal structure of the ironless motor of the present invention.

2 is a plan view of the ironless motor of the present invention.

3 is a schematic diagram of the internal structure of the iron-core motor of the present invention.

4 is a schematic diagram of the internal structure of the double-layer energy storage flywheel of the present invention.

5 is a top view of the double-layer energy storage flywheel of the present invention.

detailed description

In order to make the objectives, technical solutions and advantages of the present invention clearer, the present invention will be further described in detail with reference to the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention, and are not intended to limit the present invention.

In the following, many aspects of the invention will be better understood with reference to the drawings. The parts in the drawings are not necessarily drawn to scale. Instead, the emphasis is on clearly explaining the components of the invention. Furthermore, in several views in the drawings, the same reference numerals indicate corresponding parts.

The words "exemplary" or "illustrative" as used herein mean serving as an example, instance, or illustration. Any embodiment described herein as "exemplary" or "illustrative" is not necessarily to be construed as preferred or advantageous over other embodiments. All the embodiments described below are exemplary embodiments. These exemplary embodiments are provided to enable those skilled in the art to make and use the embodiments of the present disclosure and are not intended to limit the scope of the present disclosure. The scope of the present disclosure is The claims are limited. In other embodiments, well-known features and methods are described in detail so as not to obscure the present invention. For the purposes described herein, the terms "upper", "lower", "left", "right", "front", "back", "vertical", "horizontal" and their derivatives will be oriented as shown in Figure 1 Of invention. Furthermore, there is no intention to be bound by any expressed or implied theory given in the preceding technical field, background, brief summary or the following detailed description. It should also be understood that the specific devices and processes shown in the drawings and described in the following description are simple exemplary embodiments of the inventive concept defined in the appended claims. Therefore, specific dimensions and other physical characteristics related to the embodiments disclosed herein should not be construed as limiting, unless the claims expressly state otherwise.

The embodiment of the present invention provides a motor based on a double-layer rotor structure, which can be applied to a double-layer energy storage flywheel, and can also be used as a pure motor, a pure generator, or an electric and power generation integrated machine (ie, inner rotor and outer One of the two rotors is a motor, and the other rotor is a generator). The motor may be a coreless motor or a cored motor, preferably a coreless motor. In this application, there is no physical connection between the inner rotor and the outer rotor, and the inner rotor and the outer rotor are coupled by the action of a magnetic field, so that the inner rotor and the outer rotor are mutually linked.

Please refer to FIGS. 1 and 2, which show an ironless motor based on a double-layer rotor structure. The motor includes: a mounting shell 10, a stator (not shown in the figure), an inner rotor 30, and an outer rotor 40.

The stator is fixed to the mounting shell 10, the stator includes a supporting structure (not shown in the figure) and a stator coil 20 wound around the supporting structure, the inner rotor 30 is rotatably disposed inside the mounting shell 10, and the outer wall of the inner rotor 30 An inner rotor excitation magnet 301 is provided on the inner rotor excitation magnet 301 between the inner rotor 30 and the stator coil 20; the outer rotor 40 is rotatably sleeved on the outside of the mounting shell 10, and the outer rotor excitation magnet is provided on the inner wall of the outer rotor 40 The magnet 401 and the stator coil 20 are sandwiched between the inner rotor field magnet 301 and the outer rotor field magnet 401.

Further, the supporting structure is made of metal or non-metallic materials, or one or more non-forming materials. The non-forming materials include but are not limited to gel, rubber, glass, and resin. The supporting structure may be made of gel, Made of one or more of rubber, glass and resin.

In this embodiment, the motor is provided without an iron core. Since the bias magnetic field on the stator is provided by the inner rotor field magnet 301 and the outer rotor field magnet 401, the rotation of the inner rotor 30 and the outer rotor 40 can be synchronized and reduced Control difficulty, therefore, while greatly reducing the magnetic resistance of the magnetic circuit while increasing the magnetic driving force, the bias magnetic field strength is higher, and because the motor does not have an iron core, there is no effect of magnetic saturation, so the higher The strength of the bias magnetic field increases the power density of the motor.

The ironless motor of this embodiment retains the advantages of the traditional ironless motor compared to the traditional iron core permanent magnet motor, reduces hysteresis loss, improves motor efficiency, reduces stator space, and eliminates cogging torque , To make the motor torque output smoother, better control efficiency and effect, the ironless motor has a double-layer rotor structure on the basis of maintaining the advantages of the traditional ironless motor, which greatly improves the bias magnetic field of the motor, thus The power density of the motor is improved. At the same time, due to the reduced motor stator flow requirements at the same power, the stator heat loss is reduced, the temperature of the motor is reduced, and the reliability and life of the motor are improved.

In another embodiment, please refer to FIG. 3, which shows a cored motor based on a double-layer rotor structure. The motor includes: a mounting shell 10, a stator (not shown in the figure), an inner rotor 30, and an outer rotor 40.

The stator is fixed to the mounting shell 10, the stator further includes a stator core 202, the stator coil 20 is wound around the stator core 202, the inner rotor 30 is rotatably disposed inside the mounting shell 10, and the inner wall of the inner rotor 30 is provided with an inner The rotor excitation magnet 301, the inner rotor excitation magnet 301 is located between the inner rotor 30 and the stator coil 20; the outer rotor 40 is rotatably sleeved outside the mounting shell 10, the outer rotor excitation magnet 401 is provided on the inner wall of the outer rotor 40, the stator The coil 20 is sandwiched between the inner rotor field magnet 301 and the outer rotor field magnet 401.

Further, on the basis of the above embodiment, a plurality of teeth arranged at intervals along the circumference of the stator core 202 are formed on the radial inner surface of the stator core 202, and one for fixing the stator coil 20 is formed between the plurality of teeth The stator core 202 is sandwiched between the inner rotor field magnet 301 and the outer rotor field magnet 401. The stator iron core 202 includes a plurality of iron core laminations, which are laminated in the axial direction of the stator iron core 202 Settings.

In this embodiment, since the bias magnetic field on the stator is provided by the inner rotor excitation magnet 301 and the outer rotor excitation magnet 401, the rotation of the inner rotor 30 and the outer rotor 40 can be synchronized, reducing the control difficulty. While reducing the magnetic resistance of the magnetic circuit and increasing the magnetic driving force, the bias magnetic field is stronger.

In the above embodiment, there is no physical mechanism connection between the inner rotor 30 and the outer rotor 40, and the inner rotor 30 and the outer rotor 40 are coupled by the action of the magnetic field, so that the inner rotor 30 and the outer rotor 40 are mutually linked, that is, the inner rotor 30 and the outer rotor 40 are rotated. One of the two rotors 40 will rotate due to the magnetic attraction. In addition, due to the coupling of the stator current and the magnetic field, the inner rotor 30 and the outer rotor 40 rotate at the same speed due to the excitation current.

Based on the above embodiment, in this embodiment, please refer to FIGS. 1, 3 and 4, the mounting shell 10 includes an upper shell 100 and a lower shell 101; please refer to FIGS. 1 and 4, the support structure is provided in Between the upper case 100 and the lower case 101, please refer to FIG. 3, the stator core 202 is provided between the upper case 100 and the lower case 101, and the upper case 100 and the lower case 101 cooperate to fix the inner The rotor 30 and the outer rotor 40 and the mounting shell 10 are made of metal or non-metallic materials. The upper shell 100 and the lower shell 101 may be integrally formed with the support structure or may be mechanically connected.

On the basis of the above embodiment, further, please refer to FIGS. 1, 3 and 4, the mounting shell 10 provides support for the inner rotor 30 and the outer rotor 40 through different kinds of bearings, and the inner rotor 30 and the mounting shell 10 They are connected by an inner rotor bearing 302, and the outer rotor 40 and the mounting shell 10 are connected by an outer rotor bearing 402. Preferably, the upper and lower ends of the inner rotor 30 are connected to the inner rotor bearing 302. When the inner rotor bearing 302 rotates, the inner rotor 30 can be driven to rotate together. The upper and lower ends of the outer rotor 40 are connected to the outer rotor bearing 402, and the outer rotor bearing 402 rotates It can drive the outer rotor 40 to rotate together.

In this embodiment, please refer to FIGS. 1, 3 and 4, the upper housing 100 fixes the upper end of the inner rotor 30 through the inner rotor bearing 302, the upper end of the outer rotor 40 is fixed through the outer rotor bearing 402, and the lower housing 101 passes The inner rotor bearing 302 fixes the lower end of the inner rotor 30 and the outer rotor bearing 402 fixes the lower end of the outer rotor 40.

Further, the types of the inner rotor bearing 302 and the outer rotor bearing 402 are not limited to one. The inner rotor bearing 302 is one or more of rolling bearings, sliding bearings, magnetic bearings, and pneumatic bearings, and the outer rotor bearing 402 is a rolling bearing, One or more of sliding bearings, magnetic bearings and pneumatic bearings.

Since there is no physical mechanism connection between the inner rotor 30 and the outer rotor 40, there is a certain degree of independence. According to the different loads of the inner rotor 30 and the outer rotor 40 of the motor, the inner rotor 30 and the outer rotor 40 can be used as different forms of applications in the system For example, one of the inner rotor 30 and the outer rotor 40 is used as a motor and the other is used as a generator.

Based on the above embodiment, the motor based on the double-layer rotor structure may be both an inner rotor 30 and an outer rotor 40, or both the inner rotor 30 and the outer rotor 40 may be electric motors or integrated electric and power generators (ie, inner One of the rotor 30 and the outer rotor 40 is an electric motor, and the other rotor is a generator). The inner rotor 30 is connected to an external load or an external drive. When the inner rotor 30 is connected to an external load, it is used as a motor, and when the inner rotor 30 is connected to an external drive, it is used as a generator.

The outer rotor 40 is connected to an external load or an external drive. When the outer rotor 40 is connected to an external load, it is used as a motor, and when the outer rotor 40 is connected to an external drive, it is used as a generator.

Specifically, when both the inner rotor 30 and the outer rotor 40 are connected to an external drive, the motor is used as a generator. The inner rotor 30 and the outer rotor 40 have a leading angle relative to the stator current space vector rotation, but the rotation speed of the two is the same Typical applications include double-layer flywheels and double-layer turbine generators in the discharged state.

When both the inner rotor 30 and the outer rotor 40 are connected to an external load, the motor is used as a motor. There is a lag angle between the inner rotor 30 and the outer rotor 40 relative to the stator current space vector rotation, but the rotation speed of the two is the same, typical applications There are double-layer compressor, double-layer blower, double-layer servo motor, single-layer drive motor + coil cooling fan, double-layer flywheel under charging state, etc.

When the inner rotor 30 is connected to an external drive, it is used as a generator, and when the outer rotor 40 is connected to an external load, it is used as a motor. At this time, the motor is an electric and power generation machine. There is a rotation of the outer rotor 40 relative to the stator current space vector. The lag angle, the inner rotor 30 has a leading angle relative to the stator current space vector rotation, but the two have the same rotation speed, and the typical application is a hybrid turbocharger (the inner rotor 30 is a turbine and the outer rotor 40 is a compressor) 3. Magnetic coupling coupling.

When the inner rotor 30 is connected to an external load, it is used as a motor, and when the outer rotor 40 is connected to an external drive, it is used as a generator. At this time, the motor is an integrated electric and power generator. There is a rotation of the inner rotor 30 relative to the stator current space vector. Lag angle, there is a lead angle for the rotation of the outer rotor 40 relative to the stator current space vector, but the rotation speed of the two is the same. Typical applications are hybrid superchargers (the outer rotor 40 is a turbine and the inner rotor 30 is a compressor), Magnetic coupling coupling.

Embodiments of the present invention also provide a double-layer energy storage flywheel. The above motors (including ironless motors and iron core motors) are applied to double-layer energy storage flywheels, preferably ironless motors, please refer to FIG. 4 and 5, 4 and 5 show a double-layer energy storage flywheel including an ironless motor, an outer rotor 40 connected to the outer rotor flywheel 403, and the outer rotor flywheel 403 is provided outside the mounting shell 10 The inner rotor 30 is connected to the inner rotor flywheel 303. The inner rotor flywheel 303 is provided inside the mounting case 10 and is installed outside the inner rotor 30.

In this embodiment, the working forms of the outer rotor flywheel 403 and the inner rotor flywheel 303 include four combinations. The working form refers to energy storage and energy release, where energy storage refers to storing energy in the form of kinetic energy to complete In the energy storage process of mechanical kinetic energy conversion, energy release refers to the process of releasing energy through the conversion of power converter output current and voltage suitable for the load to complete the conversion of mechanical kinetic energy into electrical energy. The four combinations are as follows: (1) Energy storage of outer rotor flywheel 403, energy storage of inner rotor flywheel 303; (2) Energy release of outer rotor flywheel 403, energy release of inner rotor flywheel 303, (3) Energy storage of outer rotor flywheel 403 , The inner rotor flywheel 303 releases energy, (4) the outer rotor flywheel 403 releases energy, and the inner rotor flywheel 303 stores energy.

In the conventional flywheel structure, the energy-bearing rotor is either the inner rotor 30 structure or the outer rotor 40 structure. The energy of the double-layer energy storage flywheel of this embodiment is concentrated on the double-layer rotor. The double-layer energy storage flywheel of this embodiment replaces the iron-less motor with double-layer rotor structure to the traditional iron-core permanent magnet motor, which reduces the loss of the motor and improves the energy conversion efficiency, because the inner and outer double The structure of the layered rotor makes effective use of space, which increases the weight of the flywheel available per unit volume, thereby increasing the density of energy stored by the flywheel.

Further, referring to FIG. 4, the mounting shell 10 is formed with a hollow cavity 102. The hollow cavity 102 includes a first cavity 1021 and a second cavity 1022. The cross sections of the first cavity 1021 and the second cavity 1022 are inverted. "Font.

Further, the outer rotor 40 is located outside the first cavity 1021, the inner rotor 30 is installed in the first cavity 1021, and the inner rotor 30 extends from the first cavity 1021 to the second cavity 1022.

Further, the outer rotor flywheel 403 is sleeved on the outside of the first cavity 1021, and the inner rotor flywheel 303 is accommodated in the second cavity 1022.

The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modification, equivalent replacement and improvement made within the spirit and principle of the present invention should be included in the protection of the present invention Within range.

Claims

A motor based on a double-layer rotor structure, characterized in that the motor includes:

Mounting shell

A stator fixed to the mounting shell, the stator including a stator coil;

An inner rotor rotatably provided inside the mounting shell, an inner rotor field magnet is provided on an outer wall of the inner rotor, and the inner rotor field magnet is located between the inner rotor and the stator coil;

The outer rotor rotatably sleeved on the outside of the mounting shell, an outer rotor field magnet is provided on the inner wall of the outer rotor, and the stator coil is sandwiched between the inner rotor field magnet and the outer rotor field magnet .
The motor based on the double-layer rotor structure according to claim 1, wherein the mounting shell includes an upper shell and a lower shell, and the upper shell and the lower shell cooperate to fix the For the inner rotor and the outer rotor, the mounting shell is made of metal or non-metal material.
The motor based on the double-layer rotor structure according to claim 1, wherein the inner rotor and the mounting shell are connected by an inner rotor bearing, and the outer rotor and the mounting shell are connected by an outer rotor Bearing connection.
The motor based on the double-layer rotor structure according to claim 3, wherein the inner rotor bearing is one or more of a rolling bearing, a sliding bearing, a magnetic bearing, and an air bearing.
The electric machine based on the double-layer rotor structure according to claim 3, wherein the outer rotor bearing is one or more of a rolling bearing, a sliding bearing, a magnetic bearing, and an air bearing.
The motor based on a double-layer rotor structure according to any one of claims 1 to 5, wherein the stator has no stator core, the stator further includes a supporting structure, and the stator coil is fixed to the On the supporting structure, the supporting structure is made of metal or non-metallic materials, or one or more non-molding materials, and the non-molding materials include gel, rubber, glass, and resin.
The motor based on the double-layer rotor structure according to any one of claims 1 to 5, wherein the stator may also include a stator core, the stator coil is wound around the stator core, the stator iron A core is sandwiched between the inner rotor field magnet and the outer rotor field magnet, the stator core includes a plurality of core laminations, and the plurality of core laminations are stacked along the axial direction of the stator core Settings.
The electric machine based on the double-layer rotor structure according to any one of claims 1 to 7 wherein both the inner rotor and the outer rotor are generators, or the inner rotor and the outer rotor are electric motors, or the One of the inner rotor and the outer rotor is an electric motor and the other rotor is an application in a generator.
A double-layer energy storage flywheel, characterized by comprising the motor according to any one of claims 1 to 7, the outer rotor is connected to the outer rotor flywheel, and the outer rotor flywheel is provided outside the mounting shell. The inner rotor is connected to an inner rotor flywheel, and the inner rotor flywheel is provided inside the mounting shell and is installed outside the inner rotor.
The double-layer energy storage flywheel according to claim 9, wherein the mounting shell is formed with a hollow first cavity and a first cavity at the lower end of the first cavity which is integrally communicated with the first cavity Two cavities, the cross section of the first cavity and the second cavity is in an inverted "T" shape, the outer rotor is located outside the first cavity, the inner rotor is mounted on the In the first cavity, the inner rotor extends from the first cavity to the second cavity, the outer rotor flywheel is sleeved outside the first cavity, and the inner rotor flywheel is housed in the Described in the second cavity.