Stator shaft radial excitation flywheel energy storage motor

Abstract

The application discloses a kind of stator shaft radial field flywheel energy storage motor, belong to electric energy storage technical field, comprising: from top to bottom sequentially arranged upper end cover, upper permanent magnet ring, flywheel rotor and lower end cover, still include between upper and lower end cover and around flywheel rotor shell, and the stator core and ferromagnetic ring of shell inner side, still include excitation winding and / or lower permanent magnet ring.Excitation winding can make motor field weakening or magnify based on different excitation direction.The suspension force of rotor is only provided by upper permanent magnet ring.Through the axial setting upper permanent magnet ring, radial setting excitation winding and / or lower permanent magnet ring, so that suspension magnetic circuit and excitation magnetic circuit are fully decoupled, simplify motor design.So, the topology structure proposed in the application has stable suspension force, can reduce bearing loss and the self-discharge rate of system, can adjust excitation current to adjust motor magnetic flux, and motor charge-discharge efficiency is high, power density is high, system integration is high, cost is low.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of electrical energy storage, and more particularly relates to a stator shaft radial field flywheel energy storage motor. BACKGROUND

[0002] In order to meet the demand for clean electrical energy and power supply reliability, many countries in the world have carried out extensive research and development on energy technology. Among them, energy storage is an important research direction and has become a strategic emerging industry that countries around the world are competing to develop. Among the many energy storage methods, flywheel energy storage stores electrical energy in the form of mechanical energy, has the advantages of high power density, fast response speed, environmental friendliness, unlimited number of charging and discharging times, and long service life, and has great development potential and application prospect.

[0003] The flywheel energy storage motor, as the core component of the flywheel energy storage system, is crucial to its performance. Permanent magnet motors are the main choice for flywheel energy storage systems due to their high efficiency and high power factor. However, conventional permanent magnet motors have the problems of unadjustable excitation and low magnetic steel strength, which limits the energy storage capacity of the motor rotor. In order to increase the energy storage capacity, the permanent magnet motor rotor is usually connected to the flywheel to increase the energy storage capacity, which increases the size of the system and reduces the energy storage density of the system. The rotor structure of the inductor motor is robust, and it also serves as an energy storage and energy conversion function, which can improve the system integration and increase the energy storage density of the system. However, the inductor motor has the problems of low charging and discharging efficiency and low power density. In addition, in order to reduce bearing loss and reduce the self-discharge rate of the system, the flywheel energy storage system usually also needs a magnetic bearing system. This makes the system structure complex, increases the cost, and reduces the dynamic performance of the rotor.

[0004] In a Chinese patent with application publication number CN112117861A, a flywheel energy storage motor is proposed, which sets permanent magnet rings on the upper and lower end covers to generate an upward suspension force to reduce the bearing load. However, to ensure the suspension force, the upper and lower permanent magnet rings need to meet strict matching relationships, which constrains the design of the upper and lower permanent magnet rings, and the suspension force and power of the motor are coupled, and in addition, the air gap flux density of this structure cannot be adjusted. Then in a Chinese patent with application publication number CN112398269A, a stator hybrid excitation flywheel energy storage motor is proposed, which only sets an upper permanent magnet ring to provide suspension force for the rotor, breaking the design constraints of the permanent magnet ring, and sets an excitation winding to adjust the air gap main flux by adjusting the excitation current. However, the magnetic circuit of the excitation winding and the magnetic circuit of the permanent magnet ring are coupled, so the suspension force will be affected by the change of the excitation current and become unstable. In addition, this structure mainly uses the excitation winding excitation method, so the charging efficiency will be low. SUMMARY

[0005] In view of the defects of the prior art and the need for improvement, the present application provides a stator shaft radial excitation flywheel energy storage motor, which aims to simplify the design of the permanent magnet ring and stabilize the suspension force in the energy storage motor.

[0006] To achieve the above-mentioned purpose, according to one aspect of the present application, a stator shaft radial excitation flywheel energy storage motor is provided, which comprises an upper end cover, an upper permanent magnet ring, a flywheel rotor and a lower end cover arranged in sequence from top to bottom along the axial direction; the upper permanent magnet ring is fixed to the upper end cover and forms an axial air gap with the flywheel rotor; the flywheel rotor comprises a lower flywheel disc and a rotor above the lower flywheel disc;

[0007] The stator shaft radial excitation flywheel energy storage motor further comprises a machine shell located between the upper end cover and the lower end cover and surrounding the outside of the flywheel rotor, and a stator core and a ferromagnetic ring arranged on the inside of the machine shell; the stator core surrounds the outside of the rotor and forms a radial air gap with the rotor, and the stator core is provided with an armature winding; the ferromagnetic ring surrounds the outside of the lower flywheel disc and is located below the stator core;

[0008] The stator shaft radial excitation flywheel energy storage motor further comprises at least one of the following structures:

[0009] An excitation winding arranged on the inside of the machine shell, surrounding the outside of the lower flywheel disc and located between the stator core and the ferromagnetic ring;

[0010] A lower permanent magnet ring arranged on the inside of the ferromagnetic ring.

[0011] In some optional embodiments, the flywheel rotor is an integrated structure formed by machining an alloy forge piece.

[0012] In some optional embodiments, the flywheel rotor is composed of a lower rotor disc and a rotor machined separately and combined, the outer diameter of the lower flywheel disc is greater than or equal to the outer diameter of the rotor, and the corresponding machine shell diameter of the lower flywheel disc is greater than or equal to the corresponding machine shell diameter of the motor rotor.

[0013] Further, the stator shaft radial excitation flywheel energy storage motor provided by the present application further comprises an upper flywheel disc arranged above the rotor, and the outer diameter of the upper flywheel disc is equal to the outer diameter of the rotor.

[0014] In some optional embodiments, the upper permanent magnet ring and the lower permanent magnet ring are both composed of fan-shaped permanent magnet blocks;

[0015] When working, the permanent magnet blocks in the upper permanent magnet ring are all axially magnetized and have the same magnetization direction, and all the permanent magnet blocks in the lower permanent magnet ring are all radially magnetized and have the same magnetization direction.

[0016] Further, the stator shaft radial excitation flywheel energy storage motor provided by the application further comprises: an upper bearing seat arranged at the center of the upper end cover, and an upper bearing is arranged in the upper bearing seat; and a lower bearing seat arranged at the center of the lower end cover, and a lower bearing is arranged in the lower bearing seat.

[0017] Further, the upper end cover, the lower end cover and the shell are made of ferromagnetic material; and the upper bearing seat and the lower bearing seat are made of non-ferromagnetic material.

[0018] Further, the rotor side is provided with a plurality of tooth grooves.

[0019] Overall, the above technical solutions conceived by the application can achieve the following beneficial effects:

[0020] (1) The stator shaft radial excitation flywheel energy storage motor provided by the application only provides suspension force by arranging an upper permanent magnet ring, and an excitation winding or a lower permanent magnet ring is arranged below the stator core to generate excitation magnetic flux, and the magnetic circuit of the excitation magnetic field is guided by the radially arranged ferromagnetic ring, so that coupling between the excitation magnetic flux and the magnetic flux of the upper permanent magnet ring is avoided, and the stability of the suspension force is ensured. In one of the schemes, the excitation winding and the lower permanent magnet ring are simultaneously arranged, so that a shell hybrid excitation structure is realized, the air gap magnetic flux is adjustable while the stability of the suspension force is ensured, and the charging efficiency is high. In one of the schemes, only the lower permanent magnet ring is arranged, and the excitation winding is not arranged, so that a shell permanent magnet structure is realized, the charging efficiency is high while the stability of the suspension force is ensured. In one of the schemes, only the excitation winding is arranged, and the lower permanent magnet ring is not arranged, so that a shell electric excitation structure is realized, the air gap magnetic flux is flexibly adjustable while the stability of the suspension force is ensured.

[0021] (2) The stator shaft radial excitation flywheel energy storage motor provided by the application adopts an integrated structure design in some of the schemes, and has the advantages of firm rotor structure, simple and compact overall structure, high integration, high energy storage density and low cost.

[0022] (3) The stator shaft radial excitation flywheel energy storage motor provided by the application is composed of a lower flywheel disc at the lower side and a structure at the upper side which are independently machined and then combined, so that the design of the motor power and the flywheel energy storage capacity can be decoupled, and the comprehensive performance of the flywheel energy storage motor can be effectively improved.

[0023] (4) The stator shaft radial excitation flywheel energy storage motor provided by the application provides axial suspension force by the upper permanent magnet ring, and the flywheel rotor is supported by the mechanical bearing, so that the bearing load and the bearing loss can be reduced, the bearing life can be prolonged, and the self-discharge rate of the flywheel energy storage system can be reduced. BRIEF DESCRIPTION OF DRAWINGS

[0024] Figure 1A cross-sectional view of the stator shaft radial field flywheel energy storage motor provided in Embodiment 1 of the present application;

[0025] Figure 2 A schematic diagram of the flywheel rotor in Embodiment 1 of the present application;

[0026] Figure 3 A main magnetic flux path diagram of the permanent magnet ring in Embodiment 1 of the present application;

[0027] Figure 4 A main magnetic flux path diagram of the permanent magnet ring and the field winding both working in Embodiment 1 of the present application;

[0028] Figure 5 A cross-sectional view of the stator shaft radial field flywheel energy storage motor provided in Embodiment 3 of the present application;

[0029] Figure 6 A main magnetic flux path diagram of Embodiment 3 of the present application;

[0030] Figure 7 A cross-sectional view of the stator shaft radial field flywheel energy storage motor provided in Embodiment 4 of the present application;

[0031] Figure 8 A main magnetic flux path diagram of Embodiment 4 of the present application;

[0032] In all the drawings, the same reference signs are used to represent the same elements or structures, wherein:

[0033] 1 - stator core; 2 - armature winding; 3 - flywheel rotor, 301 - rotor, 301a - rotor tooth, 301b - rotor slot, 302 - lower flywheel disc; 4 - field winding; 5 - lower permanent magnet ring; 6 - ferromagnetic ring; 7 - upper permanent magnet ring; 801 - upper bearing, 802 - lower bearing; 901 - upper bearing seat, 902 - lower bearing seat; 10 - upper end cover; 11 - lower end cover; 12 - machine housing. DETAILED DESCRIPTION

[0034] In order to make the objectives, technical solutions and advantages of the present application clearer, the present application is further described in detail below with reference to the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and should not be used to limit the present application. In addition, the technical features involved in each embodiment of the present application described below can be combined with each other as long as they do not conflict with each other.

[0035] In the present application, the terms "first", "second" and the like (if any) in the present application and the drawings are used to distinguish similar objects, and do not necessarily describe a specific order or sequence.

[0036] Embodiment 1:

[0037] A stator shaft radial excitation flywheel energy storage motor, such as Figure 1 As shown, the device includes an upper end cover 10, an upper permanent magnet ring 7, a flywheel rotor 3, and a lower end cover 11 arranged sequentially from top to bottom along the axial direction; the upper permanent magnet ring 7 is fixed to the upper end cover 10, forming an axial air gap with the flywheel rotor 3; as shown... Figure 2 As shown, the flywheel rotor 3 includes a lower flywheel disk 302 and a rotor 301 above the lower flywheel disk 302. The rotor 301 has multiple rotor teeth 301a and rotor slots 301b on its side.

[0038] like Figure 1 As shown, the stator-shaft radial excitation flywheel energy storage motor provided in this embodiment further includes: a housing 12 located between the upper end cover 10 and the lower end cover 11 and surrounding the outside of the flywheel rotor 3; and a stator core 1, an excitation winding 4, and a ferromagnetic ring 6 disposed inside the housing 12. The stator core 1 surrounds the outside of the rotor 301, forming a radial air gap with the rotor 301, and an armature winding 2 is disposed on the stator core 1. The ferromagnetic ring 6 surrounds the outside of the lower flywheel disk 302 and is located below the stator core 1, and a lower permanent magnet ring 5 is disposed inside the body magnetic ring. The excitation winding 4 surrounds the outside of the lower flywheel disk 302 and is located between the stator core 1 and the ferromagnetic ring 6. Optionally, in this embodiment, both the upper permanent magnet ring 7 and the lower permanent magnet ring 5 are composed of fan-shaped annular permanent magnet blocks.

[0039] like Figure 1 As shown, the stator shaft radial excitation flywheel energy storage motor provided in this embodiment further includes: an upper bearing seat 901 disposed at the center of the upper end cover 10, which contains an upper bearing 801, providing axial and radial positioning support for the flywheel rotor 3; and a lower bearing seat 902 disposed at the center of the lower end cover 11, which contains a lower bearing 802, providing radial support for the flywheel rotor 3; the upper end cover 10, the lower end cover 11, and the housing 12 are all made of ferromagnetic material, serving as magnetic conductors, and the upper and lower end covers also serve as fixation; the upper bearing seat 901 and the lower bearing seat 902 are made of non-ferromagnetic material, serving as fixation and reducing magnetic leakage.

[0040] The stator shaft radial excitation flywheel energy storage motor provided in this embodiment, during operation, has its upper permanent magnet ring 7 axially magnetized, and its magnetic flux path is as follows: Figure 3 As shown, the specific path is: upper permanent magnet ring 7 → rotor 301 → stator core 1 → housing 12 → upper end cover 10 → upper permanent magnet ring 7. The magnetic circuit of the upper permanent magnet ring 7 passes through both the axial air gap and the radial main air gap, thus providing main air gap magnetic flux and generating axial levitation force. The lower permanent magnet ring 5 is radially magnetized, and its magnetic flux path is as follows: Figure 3As shown, specifically: the lower permanent magnet ring 5 → the lower flywheel disc 302 → the rotor 301 → the stator core 1 → the casing 12 → the ferromagnetic ring 6 → the lower permanent magnet ring 5. The magnetic circuit of the lower permanent magnet ring 5 only passes through the radial air gap, and thus the lower permanent magnet ring 5 provides excitation without affecting the size of the suspension force.

[0041] When the excitation winding 4 is connected with current, the magnetic flux path thereof is shown by the dashed line path in FIG. 4, which is the same as the magnetic flux path of the lower permanent magnet ring 5, and only passes through the radial air gap. The direction of the magnetic flux of the excitation winding 4 can be changed according to the direction of the excitation current, and the size of the magnetic flux can be adjusted according to the size of the excitation current, so that the air gap magnetic flux can be adjusted. Similarly, when the excitation current changes, the magnetic flux of the axial air gap will not be affected, and thus the size of the suspension force will not be affected, so that the suspension force is relatively stable. Figure 4

[0042] In addition, the lower permanent magnet ring 5 is arranged inside the radially arranged ferromagnetic ring 6, which can effectively improve the charging efficiency of the energy storage motor.

[0043] Overall, the stator shaft radial excitation flywheel energy storage motor provided by the embodiment is a casing hybrid excitation structure, the air gap magnetic flux of which can be flexibly adjusted, the suspension force of which is stable, and the charging efficiency of which is high.

[0044] In order to improve the integration, as an optional embodiment, in the embodiment, the flywheel rotor is an integrated structure formed by processing an alloy forge piece; based on the integrated flywheel rotor structure, the stator shaft radial excitation flywheel energy storage motor provided by the embodiment has the advantages of firm rotor structure, high power density, stable suspension force, low bearing load and bearing loss, and the overall structure is simple and compact, has high integration, high energy storage density and low cost.

[0045] Embodiment 2:

[0046] A stator shaft radial excitation flywheel energy storage motor, the embodiment is similar to the above-mentioned embodiment 1, the difference is that, in the embodiment, the flywheel rotor is composed of a lower rotor disc and a structure above the lower rotor disc which are respectively processed and combined, the outer diameter of the lower flywheel disc is greater than or equal to the outer diameter of the rotor, and the casing diameter corresponding to the lower flywheel disc is greater than or equal to the casing diameter corresponding to the motor rotor.

[0047] In the stator shaft radial excitation flywheel energy storage motor provided by the embodiment, the energy storage amount of the flywheel energy storage motor mainly depends on the lower flywheel disc, and the power depends on the rotor, and when the outer diameter of the lower flywheel disc and the outer diameter of the rotor are the same, there will be certain constraints and coupling between the power and the energy storage amount of the flywheel energy storage motor. In the embodiment, the upper and lower parts of the flywheel rotor are independently processed, which can further decouple the design of the motor power and the flywheel energy storage amount, and effectively improve the comprehensive performance of the flywheel energy storage motor. ​

[0048] In a preferred embodiment, an upper flywheel disk is also provided above the rotor. The outer diameter of the upper flywheel disk is the same as the outer diameter of the rotor, and it is machined together with the rotor. The design of the upper flywheel disk can increase energy storage and help ensure the balance of the upper and lower structures of the flywheel rotor, namely the lower flywheel disk and the structure above the lower flywheel disk. It is easy to understand that, because of the upper flywheel disk in this embodiment, the main magnetic flux of the upper permanent magnet ring will pass through the upper flywheel disk first and then through the rotor, specifically: upper permanent magnet ring → upper flywheel disk → rotor → stator core → housing → upper end cover → upper permanent magnet ring.

[0049] Example 3:

[0050] A stator shaft radial excitation flywheel energy storage motor, such as Figure 5 As shown, it includes an upper end cover 10, an upper permanent magnet ring 7, a flywheel rotor 3 and a lower end cover 11 arranged sequentially from top to bottom along the axial direction; the upper permanent magnet ring 7 is fixed on the upper end cover 10 and forms an axial air gap with the flywheel rotor 3; the flywheel rotor 3 includes a lower flywheel disk 302 and a rotor 301 above the lower flywheel disk 302.

[0051] like Figure 5 As shown, the stator shaft radial excitation flywheel energy storage motor provided in this embodiment further includes: a housing 12 located between the upper end cover 10 and the lower end cover 11 and surrounding the outside of the flywheel rotor 3, and a stator core 1 and a ferromagnetic ring 6 disposed inside the housing 12; the stator core 1 surrounds the outside of the rotor 301, forming a radial air gap with the rotor 301, and an armature winding 2 is disposed on the stator core 1; the ferromagnetic ring 6 surrounds the outside of the lower flywheel disk 302 and is located below the stator core 1, and a lower permanent magnet ring 5 is also disposed inside the body magnetic ring. Optionally, in this embodiment, both the upper permanent magnet ring 7 and the lower permanent magnet ring 5 are composed of fan-shaped annular permanent magnet blocks.

[0052] like Figure 5 As shown, the stator shaft radial excitation flywheel energy storage motor provided in this embodiment further includes: an upper bearing seat 901 disposed at the center of the upper end cover 10, which contains an upper bearing 801, providing axial and radial positioning support for the flywheel rotor 3; and a lower bearing seat 902 disposed at the center of the lower end cover 11, which contains a lower bearing 802, providing radial support for the flywheel rotor 3; the upper end cover 10, the lower end cover 11, and the housing 12 are all made of ferromagnetic material, serving as magnetic conductors, and the upper and lower end covers 11 also serve as fixation; the upper bearing seat 901 and the lower bearing seat 902 are made of non-ferromagnetic material, serving as fixation and reducing magnetic leakage.

[0053] In this embodiment, the structure of the flywheel rotor 3 can be designed as an integrated structure as described in Embodiment 1. It should be noted that, according to the actual requirements of motor efficiency and energy storage, the non-integrated structure design in Embodiment 2 can also be used in this embodiment, and the upper flywheel disc can also be arranged above the rotor 301 as in Embodiment 2.

[0054] The stator shaft radial excitation flywheel energy storage motor provided in this embodiment has the upper permanent magnet ring 7 axially magnetized, and the magnetic flux path is as shown in Figure 6 The specific magnetic flux path is: the upper permanent magnet ring 7→the rotor 301→the stator core 1→the casing 12→the upper end cover 10→the upper permanent magnet ring 7. The magnetic circuit of the upper permanent magnet ring 7 passes through the axial air gap and the radial main air gap at the same time, so it can provide the main air gap magnetic flux and generate the axial suspension force at the same time. The lower permanent magnet ring 5 is radially magnetized, and the magnetic flux path is as shown in Figure 6 The specific magnetic flux path is: the lower permanent magnet ring 5→the lower flywheel disc 302→the rotor 301→the stator core 1→the casing 12→the ferromagnetic ring 6→the lower permanent magnet ring 5. The magnetic circuit of the lower permanent magnet ring 5 only passes through the radial air gap, so the lower permanent magnet ring 5 provides excitation without affecting the size of the suspension force. In addition, the lower permanent magnet ring 5 is arranged inside the radially arranged ferromagnetic ring 6 in this embodiment, which can effectively improve the charging efficiency of the energy storage motor.

[0055] Overall, the stator shaft radial excitation flywheel energy storage motor provided in this embodiment is a casing permanent magnet structure, which has the advantages of solid rotor structure, high efficiency, high power density, stable suspension force, low bearing load and bearing loss, and at the same time, the overall structure is simple and compact, high integration, high energy storage density, and low cost.

[0056] Embodiment 4:

[0057] A stator shaft radial excitation flywheel energy storage motor, as shown in Figure 7 It comprises an upper end cover 10, an upper permanent magnet ring 7, a flywheel rotor 3 and a lower end cover 11 arranged in sequence from top to bottom along the axial direction; the upper permanent magnet ring 7 is fixed on the upper end cover 10 and forms an axial air gap with the flywheel rotor 3; the flywheel rotor 3 comprises a lower flywheel disc 302 and a rotor 301 above the lower flywheel disc 302.

[0058] As shown in Figure 7As shown in the figure, the stator shaft radial excitation flywheel energy storage motor provided by the embodiment further comprises: a casing 12 located between the upper end cover 10 and the lower end cover 11 and surrounding the outside of the flywheel rotor 3, and the stator core 1, the excitation winding 4 and the ferromagnetic ring 6 arranged inside the casing 12; the stator core 1 surrounds the outside of the rotor 301 and forms a radial air gap with the rotor 301, and the stator core 1 is provided with the armature winding 2; the ferromagnetic ring 6 surrounds the outside of the lower flywheel disc 302 and is located below the stator core 1; the excitation winding 4 surrounds the outside of the lower flywheel disc 302 and is located between the stator core 1 and the ferromagnetic ring 6. Optionally, in the embodiment, the upper permanent magnet ring 7 is composed of a fan-shaped permanent magnet block.

[0059] As shown in the figure, Figure 7 As shown in the figure, the stator shaft radial excitation flywheel energy storage motor provided by the embodiment further comprises: an upper bearing seat 901 arranged at the center of the upper end cover 10, and an upper bearing 801 arranged inside the upper bearing seat 901, the upper bearing 801 providing shaft and radial positioning support for the flywheel rotor 3; and a lower bearing seat 902 arranged at the center of the lower end cover 11, and a lower bearing 802 arranged inside the lower bearing seat 902, the lower bearing 802 providing radial support for the flywheel rotor 3; the upper end cover 10, the lower end cover 11 and the casing 12 are made of ferromagnetic material and play a role of magnetic conduction, and the upper and lower end covers 11 also play a role of fixation; the upper bearing seat 901 and the lower bearing seat 902 are made of non-ferromagnetic material and play a role of fixation and reduction of magnetic leakage.

[0060] In the embodiment, the structure design of the flywheel rotor 3 can refer to the description in the above embodiment 1 and adopt an integrated structure design. It should be noted that according to the actual requirements of motor efficiency and energy storage capacity, the embodiment can also adopt the non-integrated structure design in the above embodiment 2, and the upper flywheel disc can also be arranged above the rotor 301 as in embodiment 2.

[0061] The stator shaft radial excitation flywheel energy storage motor provided by the embodiment works as follows: the upper permanent magnet ring 7 is axially magnetized, and its magnetic flux path is as shown in the figure Figure 8 The specific magnetic flux path of the upper permanent magnet ring 7 is: the upper permanent magnet ring 7→the rotor 301→the stator core 1→the casing 12→the upper end cover 10→the upper permanent magnet ring 7. The magnetic circuit of the upper permanent magnet ring 7 passes through the axial air gap and the radial main air gap at the same time, so it can provide main air gap magnetic flux and generate axial suspension force at the same time.

[0062] When the excitation winding 4 passes through current, its magnetic flux path is as shown in the figure Figure 8As shown, specifically: ferromagnetic ring 6 → lower flywheel disc 302 → rotor 301 → stator core 1 → casing 12 → ferromagnetic ring 6. The magnetic circuit of the field winding 4 only passes through the radial air gap, so only the excitation effect, does not affect the size of the suspension force. The direction of the magnetic flux of the field winding 4 can be changed according to the direction of the excitation current, and the size of the magnetic flux can be adjusted according to the size of the excitation current, so that the air gap magnetic flux can be adjusted. When the excitation current changes, it will not affect the magnetic flux of the axial air gap, so it will not affect the size of the suspension force, so that the suspension force is relatively stable.

[0063] Overall, the stator shaft radial field flywheel energy storage motor provided by the embodiment is a casing electric excitation structure, which has stable suspension force and adjustable air gap magnetic flux, and has the advantages of solid rotor structure, high efficiency, high power density, low bearing load and low bearing loss. At the same time, the overall structure is simple and compact, has high integration, high energy storage density and low cost.

[0064] Those skilled in the art will readily understand that the above description is only the preferred embodiment of the present application, and is not intended to limit the present application. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. A stator shaft radial excitation flywheel energy storage motor, characterized in that, It includes an upper end cover, an upper permanent magnet ring, a flywheel rotor, and a lower end cover arranged sequentially from top to bottom along the axial direction; the upper permanent magnet ring is fixed to the upper end cover and forms an axial air gap with the flywheel rotor; the flywheel rotor includes a lower flywheel disk and a rotor above the lower flywheel disk; The stator shaft radial excitation flywheel energy storage motor further includes: a housing located between the upper end cover and the lower end cover and surrounding the outside of the flywheel rotor, and a stator core and a ferromagnetic ring disposed inside the housing; the stator core surrounds the outside of the rotor, forming a radial air gap with the rotor, and an armature winding is disposed on the stator core; the ferromagnetic ring surrounds the outside of the lower flywheel disk and is located below the stator core; The stator shaft radial excitation flywheel energy storage motor also includes at least one of the following structures: The excitation winding is disposed inside the housing, surrounds the outer side of the lower flywheel disk, and is located between the stator core and the ferromagnetic ring; The lower permanent magnet ring is disposed inside the ferromagnetic ring.

2. The stator shaft radial excitation flywheel energy storage motor as described in claim 1, characterized in that, The flywheel rotor is an integral structure formed by machining alloy forgings.

3. The stator shaft radial excitation flywheel energy storage motor as described in claim 1, characterized in that, The flywheel rotor is composed of a lower flywheel disk and the rotor, which are respectively machined and then combined. The outer diameter of the lower flywheel disk is greater than or equal to the outer diameter of the rotor, and the housing diameter corresponding to the lower flywheel disk is greater than or equal to the housing diameter corresponding to the motor rotor.

4. The stator shaft radial excitation flywheel energy storage motor as described in any one of claims 1 to 3, characterized in that, The flywheel rotor further includes an upper flywheel disk disposed above the rotor, the outer diameter of the upper flywheel disk being equal to the outer diameter of the rotor.

5. The stator shaft radial excitation flywheel energy storage motor as described in claim 4, characterized in that, Both the upper and lower permanent magnet rings are composed of fan-shaped permanent magnet blocks; During operation, all permanent magnet blocks in the upper permanent magnet ring are axially magnetized in the same direction, and all permanent magnet blocks in the lower permanent magnet ring are radially magnetized in the same direction.

6. The stator shaft radial excitation flywheel energy storage motor as described in any one of claims 1 to 3, characterized in that, Also includes: An upper bearing seat is located at the center of the upper end cover, and an upper bearing is disposed therein; and a lower bearing seat is located at the center of the lower end cover, and a lower bearing is disposed therein.

7. The stator shaft radial excitation flywheel energy storage motor as described in claim 6, characterized in that, The upper end cover, the lower end cover, and the housing are all made of ferromagnetic material; the upper bearing seat and the lower bearing seat are made of non-ferromagnetic material.

8. The stator shaft radial excitation flywheel energy storage motor as described in any one of claims 1 to 3, characterized in that, The rotor has multiple tooth grooves on its side.

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