CN214125053U

CN214125053U - Outer rotor coreless flywheel energy storage device

Info

Publication number: CN214125053U
Application number: CN202021983080.4U
Authority: CN
Inventors: 李涛; 郑亚民
Original assignee: Individual
Current assignee: Individual
Priority date: 2020-09-11
Filing date: 2020-09-11
Publication date: 2021-09-03
Anticipated expiration: 2030-09-11

Abstract

The utility model relates to an outer rotor coreless flywheel energy memory provides the flywheel design into the outer rotor that will store mechanical kinetic energy, and the coreless armature that sets up on its inside fixed axle is equivalent to an outer rotor coreless flywheel energy memory of internal stator. The outer rotor and the inner stator are matched with each other, so that stored mechanical energy and mechanical kinetic energy of the outer rotor are converted into electric energy, eddy current loss and hysteresis loss do not exist in the processes of charging, energy storage and discharging, the energy loss in the process of mutual conversion of the electric energy and the mechanical energy is effectively reduced, a support limiting ring can be arranged on the radial outer side of the permanent magnet, the phenomenon that fragments generated by fragmentation of the permanent magnet during high-speed rotation splash is avoided, the structure is further simplified, the energy loss is low, the conversion efficiency is high, the safety is high, a novel energy storage system with reliability and power density comprehensively surpassing chemical energy storage is completely manufactured, the energy storage system is used for electric automobiles and air conditioning systems with high requirements on weight and power density indexes, and the mechanical energy storage system is enabled to generate qualitative leap.

Description

Outer rotor coreless flywheel energy storage device

Technical Field

The utility model belongs to flywheel energy memory field, especially a no iron core flywheel energy memory of external rotor.

Background

The flywheel energy storage system is an energy storage device for converting mechanical energy and electrical energy, and is an energy storage mode that a motor drives a flywheel to rotate at a high speed and the flywheel drives a generator to generate electricity when needed, and energy storage is realized by a physical method. The flywheel energy storage system can be applied to the field of electric vehicles, for example, a coaxially-mounted double-flywheel system is utilized to store electric energy and provide a certain balance moment for vehicles so as to prevent vehicle rollover accidents; the energy-saving system can be applied to an air conditioning system, absorbs power from a power grid at night by using the wave troughs of the electric energy, is used for the electric energy demand in the daytime, and obtains certain economic benefit by using the price difference of the wave crests and the wave troughs of the electric energy; the device can also be used for wind power generation, tidal power generation and solar power generation systems, stores intermittent electric energy and provides clean energy through variable-frequency and variable-voltage control; the device can also be used for emergency power supplies of high-rise buildings; and in the sailing process of the ocean vessel, wind power is used for storing energy, and meanwhile, the moment of momentum of the flywheel is used for resisting the swing caused by sea waves, so that the sailing speed is effectively increased, the further energy conservation by oil-electricity hybrid driving is realized, and the environmental pollution is reduced.

The flywheel energy storage system is composed of a stator 20 and a rotor 21 of the motor, as shown in fig. 3, the stator and the rotor are both positioned in the vacuum cavity 13, and the rotor is connected with the flywheel 22 through a rotating shaft 19, so that the mutual conversion and storage between electric energy and mechanical kinetic energy of the flywheel running at high speed are realized; during energy storage, the electric energy drives the rotor to rotate, the rotor drives the flywheel to rotate in an accelerated manner, and the flywheel stores the energy in the form of kinetic energy to complete the energy storage process of converting the electric energy into mechanical energy; when releasing energy, the flywheel rotating at high speed drives the rotor to rotate, electric energy is output, and the process of energy release from mechanical energy to electric energy conversion is completed.

As shown in fig. 3, the conventional flywheel energy storage device operates in a vacuum environment to reduce wind resistance loss, and meanwhile, a high-speed bearing which can be used for a long time is adopted to reduce friction loss, so that energy loss in the process of mutual conversion between electric energy and mechanical energy is effectively reduced, but an iron core of a rotor in the conventional flywheel energy storage device can generate large eddy current loss and hysteresis loss when a motor operates at a high speed.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to overcome prior art not enough, provide the flywheel that will store mechanical kinetic energy and design into the external rotor, the no iron core armature that sets up on its inside fixed axle is equivalent to an external rotor no iron core flywheel energy memory of internal stator. The outer rotor and the inner stator are matched with each other, so that the stored mechanical energy and the mechanical kinetic energy of the outer rotor are converted into electric energy, the structure is further simplified, and the power density is improved.

The utility model adopts the technical proposal that:

the utility model provides an outer rotor does not have iron core flywheel energy memory, includes fixed axle, inertia rotating member and vacuum cavity, the utility model discloses an innovation lies in: the part or the whole of the fixed shaft is positioned in the vacuum cavity, the outer edge of the fixed shaft in the vacuum cavity is provided with at least one inertia rotating part rotating around the fixed shaft, a cavity is arranged in the inertia rotating part, the outer edge of the fixed shaft in the cavity is provided with a coreless armature, and two inner end faces of the inertia rotating part, which are opposite to two sides of the coreless armature, are provided with a plurality of permanent magnets.

Furthermore, the inertia rotation parts are a plurality of sets which are spaced apartRotation ofThe permanent magnet is arranged at the outer edge of the fixed shaft, and a coreless armature is arranged in each inertia rotating part.

Furthermore, inertia rotating member includes support piece, yoke and supports the spacing ring, the support piece inner edge rotates and sets up in the fixed axle outer fringe, and the outer fringe of support piece is equipped with the yoke, is provided with a plurality of permanent magnets on two inside terminal surfaces of yoke, and the outer fringe of yoke is equipped with supports the spacing ring.

Moreover, the outer edge of the fixed shaft positioned in the cavity is detachably sleeved, fixedly sleeved or integrally sleeved with an insert, and the ironless armature is arranged on the insert.

And the key block arranged on the outer edge of the fixed shaft is embedded into the key groove arranged on the positioning of the insert, and the end surface of any side of the insert is detachably or fixedly connected with the baffle plate arranged on the outer edge of the fixed shaft.

And the magnetic yoke outside the permanent magnet is provided with a non-magnetic fixed ring, the inner edge of the non-magnetic fixed ring is arranged at intervals or contacted with the outer edge of the permanent magnet, and the non-magnetic fixed ring is arranged at intervals with the armature without the iron core.

Furthermore, a position sensor is arranged between the fixed shaft and the inertial rotating member.

And the fixing shaft is of a hollow structure and is penetrated with a cable and a signal wire, the cable and the signal wire are penetrated out of the vacuum cavity, the cable is communicated with the armature without the iron core, and the signal wire is communicated with the position sensor.

The utility model has the advantages that:

in the utility model, the inertia rotating part is used as an outer rotor and is used as an energy storage flywheel, the kinetic energy is stored when the energy storage state operates at high speed (50000-70000 r/min), meanwhile, the armature without an iron core is adopted, no eddy current loss and hysteresis loss exist in the processes of charging, energy storage and discharging, the energy loss in the process of mutually converting electric energy and mechanical energy is effectively reduced, the specific energy of the energy storage flywheel is about 130-150 Wh/kg, the net efficiency (input and output efficiency) of the flywheel battery reaches about 95 percent, a support limit ring can be arranged outside the radial direction of the permanent magnet, the splash of fragments generated by the fragmentation of the permanent magnet during high-speed rotation is avoided, compared with the traditional flywheel energy storage device, the energy loss is lower, the conversion efficiency is higher, the safety is high, the structure is simple and easy to assemble, and the novel energy storage system with reliability and power density comprehensively surpassing chemical energy storage can be completely manufactured, the energy storage system is used for electric automobiles and air conditioning systems with higher requirements on weight and power density indexes, and the power density and the service life of a mechanical energy storage system are greatly improved.

Drawings

Fig. 1 is a schematic structural diagram of the present invention;

fig. 2 is a schematic structural view of another embodiment of the present invention;

fig. 3 is a schematic diagram of a conventional flywheel energy storage system.

Detailed Description

The present invention is further illustrated by the following examples, which are intended to be illustrative, not limiting and are not intended to limit the scope of the invention.

The utility model provides an outer rotor does not have iron core flywheel energy memory, as shown in fig. 1, fig. 2, including fixed axle 15, inertia rotating member and vacuum cavity 13, the utility model discloses an innovation lies in: a part or all of the fixed shaft is positioned in the vacuum cavity, at least one inertia rotating part rotating around the fixed shaft is arranged on the outer edge of the fixed shaft in the vacuum cavity, a cavity is arranged in the inertia rotating part, a coreless armature is arranged on the outer edge of the fixed shaft in the cavity, and a plurality of permanent magnets 11 are arranged on two inner end faces of the inertia rotating part opposite to two sides of the coreless armature.

A plurality of inertia rotating parts with cavities inside can be axially arranged on the same fixed shaft, an armature without an iron core is arranged in each cavity, each armature without an iron core is rigidly connected with the fixed shaft penetrating into the inertia rotating part where the armature does not exist into a whole and is detachably fixed together, the inertia rotating parts are rigidly connected, and circumferential positions of the inertia rotating parts are relatively fixed by adopting modes such as connecting rod welding or penetrating and the like, so that the rotational inertia is increased, and the energy storage effect is improved.

The following description will be made by taking as an example a structure in which an inertial rotating member is provided on a fixed shaft, as shown in fig. 1 and 2:

in the configuration of fig. 1, the inertial rotating member serves as a flywheel in a flywheel energy storage device to store mechanical kinetic energy. When energy is output, the inertia rotating part is used as an outer rotor, the armature without an iron core sleeved on the fixed shaft in the inertia rotating part is equivalent to an inner stator, and the outer rotor and the inner stator are matched with each other, so that mechanical kinetic energy of the outer rotor is converted into electric energy during output.

The inertia rotating part comprises a support piece 4, a magnetic yoke 2 and a support limiting ring 1, wherein the inner edge of the support piece is rotatably sleeved on the outer edge of the fixed shaft through a bearing 16, the outer end face, the inner end face or the outer edge of the support piece, which is far away from the outer end of the fixed shaft, is fixedly connected with the inner end part of the magnetic yoke through bolts and the like, the outer end part of the magnetic yoke is connected with the support limiting ring, one part of the inner edge of the support limiting ring is contacted with the outer edge of the magnetic yoke, a bulge facing the inside of the magnetic yoke is arranged on the inner edge in the magnetic yoke, and the two side surfaces of a spigot formed by the bulge are contacted with the inner end face of the magnetic yoke at the same side.

Permanent magnets 11 are respectively arranged on the inner side end faces of the two opposite magnetic yokes, and are physically embedded into the magnetic yokes, and the permanent magnets are fan-shaped. The permanent magnets on the two magnetic yokes and the magnetic yokes form an axial magnetic circuit, and the magnetic poles of the two permanent magnets on the two magnetic yokes which are aligned in the axial direction are opposite. And a gap is formed between the two groups of permanent magnets on the two magnet yokes, a winding part in the iron-core-free armature can be accommodated in the gap, and an air gap 14 is formed between the iron-core-free armature and the two groups of permanent magnets on the two sides of the iron-core-free armature. The magnetic yoke and the supporting limit ring are made of magnetic conductive materials, and the bearing is made of low-friction products so as to reduce friction loss of the inertia rotating part.

The installation structure of the coreless armature is as follows:

the outer edge of the fixed shaft in the cavity of the inertia rotating part is detachably sleeved, fixedly sleeved or integrally sleeved with an insert 3, a coreless armature is arranged on the insert, and a winding on the coreless armature and a permanent magnet arranged on a magnetic yoke are aligned with each other. The preferred scheme is as follows: the outer edge of the fixed shaft is provided with a key block 9, the key block is embedded into a key groove corresponding to the insert to circumferentially fix the insert, the end surface of any side of the insert is detachably or fixedly connected with the baffle 7 arranged on the outer edge of the fixed shaft through bolts 10, welding and other modes, and the insert, the baffle and the fixed shaft can be integrally manufactured.

The processing method of the armature without the iron core comprises two methods which are respectively explained as follows:

1. the armature winding 12 (wound by enameled wires) and the insert 3 are placed in a mold, and the injection molding material is epoxy molding compound and is integrally injection molded. After the epoxy molding compound in a liquid state enters the die cavity, the die cavity except the armature winding and the insert is filled, and after the epoxy molding compound is solidified, the die cavity is demolded to form the integral coreless armature (comprising the armature winding 12, the injection-molded insulator 17 and the insert 3) shown in fig. 1.

2. Winding an armature winding on a framework made of non-magnetic materials, then placing the framework and the insert in a mold, wherein the injection molding material is epoxy molding plastic, and the whole body is subjected to injection molding. And filling the die cavities except the framework, the armature winding and the insert after the epoxy molding compound in a liquid state enters the die cavity, and demolding after curing to form the integral armature without the iron core.

In any of the configurations described in items 1 and 2 above, the coreless armature can be made to maintain the deformation amount within the allowable range at the time of a large torque. The coreless armature can completely eliminate eddy current loss and hysteresis loss when operating in the magnetic field of the outer rotor at high speed.

In order to ensure the perpendicularity and rigidity of the coreless armature, the part of the coreless armature close to the supporting limit ring and the part of the coreless armature in the injection-molded insulator 17 are specially widened in the axial direction. The permanent magnets can be designed in different sizes according to the capacity of the motor and the generator. The number of the permanent magnet pole pairs, the number of the coreless armature coils and the number of the coil turns meet the relevant design requirements of electromechanics.

In addition to the embodiment shown in fig. 1, another embodiment shown in fig. 2 may be adopted, specifically:

the structure shown in fig. 2 differs from that in fig. 1 in that:

the armature winding 12 can also be designed to be a rectangular cross section, a non-magnetic fixed ring 18 (the non-magnetic fixed ring in fig. 2 can also be adopted in fig. 1) is arranged on a magnetic yoke on the radial outer side of the permanent magnet and fixed on the inner end face of the magnetic yoke 2 in a partially embedded mode, the inner edge of the non-magnetic fixed ring and the outer edge of the permanent magnet are arranged at intervals or are mutually contacted and can be axially fixed in a bolt mode, and a physical air gap is formed between the non-magnetic fixed ring and the armature winding. The structure is used for limiting the displacement of the permanent magnet in high revolution (50000-70000 r/min), and can also prevent accidental broken fragments of the permanent magnet in high revolution (50000-70000 r/min) from splashing, increase the outer side weight of the magnet yoke, increase the rotational inertia and improve the energy storage effect.

In the above two embodiments, in order to detect the rotation of the inertial rotating member, the insert 3 and the support 4 are provided with the hall position sensor 5 and the permanent magnet 6 for sensing. As shown in fig. 1, a hall position sensor 5 is provided on the side of the insert 3, and a permanent magnet 6 is provided in alignment with the inner end surface of the inertial rotating member facing the hall position sensor. In addition to the hall sensor, another sensor capable of detecting the rotation of the inertial rotating member may be provided.

When the inertia rotating parts are a plurality of inertia rotating parts, because the inertia rotating parts are in rigid connection, one inertia rotating part can be provided with a group of Hall position sensors and permanent magnets for induction.

The fixing shaft 15 is hollow, a cable and a signal cable 8 are arranged in the hollow part of the fixing shaft in a penetrating mode, and the cable and the signal cable penetrate out of the vacuum cavity through the sealing structure. The cable is in communication with the ironless armature.

The utility model discloses a use is:

1. in the energy storage stage, the coreless armature is electrified to generate a magnetic field, the magnetic field interacts with the permanent magnet on the inertia rotating part to drive the inertia rotating part to rotate, and the electric energy is converted into mechanical kinetic energy and stored in the inertia rotating part. Or other external forces can drive the inertia rotating part to rotate at high speed and store the inertia rotating part as mechanical kinetic energy.

2. In the energy releasing stage, the inertia rotating part continues to rotate by utilizing inertia, the permanent magnet on the inertia rotating part enables the armature without the iron core to generate current, and the cable returns the electric energy generated in the armature without the iron core; the signal line is communicated with the Hall position sensor, and the position and speed signals of the outer rotor of the device can be monitored in real time through Hall sensing signals when the inertia rotating part rotates.

Claims

1. The utility model provides an outer rotor does not have iron core flywheel energy memory, includes fixed axle, inertia rotating member and vacuum cavity, its characterized in that: a part or all of the fixed shaft is positioned in the vacuum cavity, the outer edge of the fixed shaft in the vacuum cavity is provided with at least one inertia rotating part rotating around the fixed shaft, a cavity is arranged in the inertia rotating part, the outer edge of the fixed shaft in the cavity is provided with a coreless armature, and two inner end faces of the inertia rotating part, which are opposite to two sides of the coreless armature, are provided with a plurality of permanent magnets; the inertia rotating part comprises a supporting piece, a magnetic yoke and a supporting limiting ring, wherein the inner edge of the supporting piece is rotatably arranged at the outer edge of the fixed shaft, the magnetic yoke is arranged at the outer edge of the supporting piece, a plurality of permanent magnets are arranged on two inner end faces of the magnetic yoke, and the supporting limiting ring is arranged at the outer edge of the magnetic yoke; the outer edge of the fixed shaft positioned in the cavity is detachably sleeved, fixedly sleeved or integrally sleeved with an insert, and the ironless armature is arranged on the insert; the key block arranged on the outer edge of the fixed shaft is embedded into the key groove arranged on the outer edge of the insert in an aligned mode, and the end face of any one side of the insert is detachably or fixedly connected with the baffle plate arranged on the outer edge of the fixed shaft.

2. The outer rotor coreless flywheel energy storage device of claim 1, wherein: the inertia rotating parts are multiple sets, the multiple sets of inertia rotating parts are arranged on the outer edge of the fixed shaft in a rotating mode at intervals, and a coreless armature is arranged in each inertia rotating part.

3. An outer rotor coreless flywheel energy storage apparatus as claimed in claim 1 or 2, wherein: the magnetic yoke outside the permanent magnet is provided with a non-magnetic fixed ring, the inner edge of the non-magnetic fixed ring is arranged at intervals with the outer edge of the permanent magnet or is contacted with the outer edge of the permanent magnet, and the non-magnetic fixed ring is arranged at intervals with the armature without the iron core.

4. An outer rotor coreless flywheel energy storage apparatus as claimed in claim 1 or 2, wherein: and a position sensor is arranged between the fixed shaft and the inertia rotating part.

5. The outer rotor coreless flywheel energy storage device of claim 4, wherein: the fixing shaft is of a hollow structure and is penetrated with a cable and a signal wire, the cable and the signal wire are penetrated out of the vacuum cavity, the cable is communicated with the armature without the iron core, and the signal wire is communicated with the position sensor.