Concentrated winding stator electro-magnetic flywheel energy storage motor

Abstract

The invention relates to a concentrated winding stator electric excitation flywheel energy storage motor, which comprises a flywheel rotor, and a stator iron core, an armature winding and an excitation winding which are arranged around the outer side of the flywheel rotor, the rotor and a rotating shaft can be of a non-integrated structure, and the magnetic conductive iron core and the rotor can also be made of different materials; open slots are formed in the inner side and the outer side of the stator iron core; the armature winding and the excitation winding are respectively placed in tooth slots in the inner side and the outer side of the stator iron core; the upper end cover and the lower end cover are respectively arranged on the upper side and the lower side of the flywheel rotor; the magnetic conductive rings are positioned above and below the flywheel rotor; and the L-shaped sealing cover is positioned in the air gap. According to the motor topological structure, the heat dissipation coefficient of the excitation winding can be improved, the eddy-current loss of the rotor is reduced, the motor temperature rise in the charging and discharging period is reduced, the bearing load and loss can be reduced, and the whole structure of the motor is firm, durable, simple, reliable, low in standby loss and high in cost performance.

Description

Technical Field

[0001] The present invention relates to the technical field of motor design, and more specifically, to a concentrated winding stator electro-excited flywheel energy storage motor. Background Art

[0002] With the economic and sustainable development of energy, the flywheel energy storage technology for electrical energy storage has gradually become a research hotspot due to its advantages such as environmental friendliness, short charge and discharge time, long service life, and high energy storage density.

[0003] The flywheel energy storage technology is a technology that converts electrical energy into mechanical energy of a rotating object and then stores the energy. In the energy storage stage, the system drives the motor to a certain speed through a power electronic converter, drives the flywheel integrated with the motor rotor to rotate at a high speed. The flywheel has the characteristic of large inertia and can store the mechanical energy brought by inertia at high speed, thus realizing the conversion of electrical energy into mechanical energy; in the energy holding stage, the entire system maintains the speed of the motor rotor and the flywheel, and hardly exchanges energy with the outside world; in the energy release stage, the flywheel energy storage motor operates as a generator, and the flywheel drives the magnetic field on the motor rotor to cut the AC winding of the motor to generate electricity externally. The speed of the flywheel integrated with the motor rotor gradually decreases, and the mechanical energy on the flywheel is converted into electrical energy through electromagnetic induction in the motor, and then is released to the outside world in the form of stable characteristic electrical energy through the power electronic conversion system.

[0004] The flywheel energy storage motor is the core component of the system energy conversion, and its performance directly affects the performance of the entire flywheel energy storage system. The motor part of the flywheel energy storage motor usually adopts a permanent magnet synchronous motor, an electro-excited synchronous motor, and an induction motor. At the same time, the flywheel energy storage motor usually needs to operate at a high speed, so it is required that the motor rotor has high mechanical strength and high reliability. The rotor of the induction motor is a solid structure with teeth and grooves on the surface, forged from high-strength alloy steel. The rotor has no permanent magnets, windings or any other additional components. When it operates, the different air gap reluctances of the teeth and grooves of the rotor (the rotor with teeth and grooves) are utilized. When the rotor rotates, the air gap reluctance between the rotor surface and the stator magnetic field will change periodically. According to the principle of minimum reluctance, the magnetic force lines tend to pass through the path with the minimum reluctance, that is, the rotor teeth, and magnetic poles will be induced on the rotor teeth, thereby generating an induced electromotive force in the stator armature winding. The magnetic field on the rotor is generated by the magnetic source on the stator through the designed magnetic circuit. The magnetic source on the stator is usually an exciting winding or a permanent magnet. The advantages of the extremely simple and reliable structure of the induction motor rotor make it very suitable for application scenarios with high energy storage density and high voltage. Due to the high structural strength of the induction motor, it can operate at a very high linear speed, and its own inertial energy storage can usually meet the load requirements. Therefore, there is no need to externally carry a flywheel device like the current inertial energy storage system, such as the up-and-down structure with a flywheel on the permanent magnet synchronous motor rotor, that is, the induction generator rotor also serves as a flywheel.

[0005] However, the excitation winding of a conventional induction motor is placed on the stator side and is circular. During the operation of the motor, the heat generated by the DC copper loss is not easily dissipated, which results in a relatively high temperature rise of the excitation winding. In addition, a permanent magnet suspended flywheel rotor is often used in a flywheel energy storage motor. The permanent magnetic field will generate iron loss in the motor, which will continuously consume the energy stored in the flywheel. Moreover, the higher the rotor speed, the greater the loss, reducing the overall energy conversion efficiency of the flywheel energy storage system. How to improve the energy utilization rate of flywheel energy storage and reduce the temperature rise of each component of the induction motor is an urgent problem to be solved.

[0006] In the prior art, in a stator hybrid-excitation flywheel energy storage motor disclosed in Chinese Patent CN112398269A, through magnetic circuit innovation, during the energy storage period, the magnetic field generated by the permanent magnet ring is mainly used to provide an axial upward electromagnetic force for the flywheel rotor, with small bearing load and loss; during the charge and discharge period, the excitation winding and the permanent magnet ring are mixedly excited, and through the cooperation of the excitation winding, the electromagnetic force received by the flywheel rotor can be kept unchanged, also achieving the effect of unloading the bearing. However, since the upper and lower end covers are ferromagnetic materials, there is coupling between the magnetic circuit of the excitation winding and the magnetic circuit of the permanent magnet ring. If the current of the excitation winding is unstable, the suspension force of the flywheel rotor will also be unstable. In addition, during the standby operation period, the permanent magnetic field will generate iron loss in the motor, which will continuously consume the energy stored in the flywheel, thereby reducing the overall energy conversion efficiency of the flywheel energy storage system.

[0007] In the prior art, in a stator electro-excitation flywheel energy storage motor disclosed in Chinese Patent CN113300532A, on the one hand, through the cooperation of the permanent magnet unloading bearing and the induction motor, the effect of reducing the bearing load is achieved; on the other hand, through magnetic circuit innovation and the use of non-ferromagnetic materials for the upper and lower end covers, the magnetic circuit coupling between the permanent magnet unloading bearing and the motor is very small, and the change of the excitation current of the motor will not affect the suspension force of the rotor. During the operation of the motor, the load fluctuation at the bearing is small and the stability is high, significantly extending the service life of the bearing. However, during the charge and discharge process of the motor, the excitation winding will generate a large amount of DC copper loss, and the circularly wound winding is not easy to dissipate heat, resulting in a relatively high temperature rise of each component of the motor. In addition, during the standby operation period, the permanent magnetic field will generate iron loss in the motor, which will continuously consume the energy stored in the flywheel, thereby reducing the overall energy conversion efficiency of the flywheel energy storage system. Summary of the Invention

[0008] Aiming at the defects and improvement requirements of the prior art, the present invention provides a concentrated winding stator electro-excitation flywheel energy storage motor, which not only reduces the temperature rise of each component of the flywheel energy storage motor and reduces the self-discharge rate of the flywheel energy storage motor, but also improves the economy and safety of the flywheel energy storage system.

[0009] To achieve the above object, according to the first aspect of the present invention, a concentrated winding stator electro-excited flywheel energy storage motor is provided, including a flywheel rotor, the flywheel rotor is vertically installed, including a rotating shaft, an upper magnetic conducting core, a lower magnetic conducting core and a rotor core, the upper magnetic conducting core and the lower magnetic conducting core are arranged on the rotating shaft, and the rotor core is arranged between the two; Surrounding the outside of the flywheel rotor, including a stator core, an electromagnetic winding and an excitation winding, the inner and outer sides of the stator core are provided with open slots respectively for placing the electromagnetic winding and the excitation winding; Upper and lower end covers are respectively arranged on both sides of the flywheel rotor, and an upper magnetic conducting ring and a lower magnetic conducting ring are respectively installed on the upper and lower end covers; One end of the L-shaped seal cover is embedded in the groove of the upper end cover for sealing, and the other end is fixed to the lower end cover for sealing, and the upper and lower ends are reinforced by pins; Bearing seats are arranged on the upper and lower end covers, and a mechanical bearing unit is arranged in the bearing seats for connecting the bearing seats and the rotating shaft.

[0010] Further, the bearing seat is made of non-ferromagnetic material.

[0011] Further, the flywheel energy storage motor further includes a machine shell, the machine shell is fixed between the upper end cover and the lower end cover, and surrounds the outside of the stator core.

[0012] Further, Np tooth grooves are arranged on the outer side of the rotor core, N is an integer greater than or equal to 1, and p is the number of rotor pole pairs.

[0013] Further, an air gap is formed between the lower surface of the upper magnetic conducting ring and the upper surface of the upper magnetic conducting core, and an air gap is formed between the upper surface of the lower magnetic conducting ring and the upper surface of the lower magnetic conducting core.

[0014] Further, the electromagnetic winding is a single set of winding structure and penetrates through the stator core.

[0015] Further, the rotating shaft and the rotor core can be an integral structure or made of different materials, and the rotor core and the upper magnetic conducting core or the lower magnetic conducting core can be made of different materials.

[0016] Further, the rotating shaft, the upper magnetic conducting core, the lower magnetic conducting core, the rotor core, the upper end cover, the lower end cover, the machine shell, the upper magnetic conducting ring and the lower magnetic conducting ring are all made of ferromagnetic materials.

[0017] Further, the excitation winding conducts a DC excitation current during charging and discharging, and stops DC excitation during energy storage holding.

[0018] Generally speaking, through the above technical solutions conceived by the present invention, the following beneficial effects can be achieved: (1)For the concentrated winding stator electro-excited flywheel energy storage motor proposed by the present invention, on the one hand, the excitation winding is placed in the tooth-slot structure outside the stator core, achieving the effects of enhancing the heat dissipation coefficient of the excitation winding and reducing the temperature rise of each component of the motor; on the other hand, the non-integrated structure of the flywheel and the rotor core in the rotating components enables the rotor core to adopt silicon steel sheet material, effectively reducing the eddy current loss of the rotor and thus reducing the temperature rise of the rotor.

[0019] (2)Through magnetic circuit innovation, the present invention uses ferromagnetic materials for the upper and lower end covers, enabling the suspension force generated by the excitation current to offset the gravity of the flywheel rotor. Moreover, after cutting off the excitation current during the standby operation stage, the self-discharge rate of the flywheel energy storage system is extremely low, effectively improving the overall energy conversion efficiency of the flywheel energy storage system.

[0020] (3)By using a sealing cover to seal the excitation winding and the electromagnetic winding, the present invention can avoid using epoxy resin-based potting materials, effectively reducing the manufacturing cost of the motor.

[0021] (4)The upper and lower end covers of the present invention enhance their stiffness by using ferromagnetic materials, effectively reducing the mechanical vibration during the operation of the motor.

[0022] In summary, the electro-excited flywheel energy storage motor of the present invention can solve the problem of high motor temperature caused by low heat dissipation coefficient of the excitation winding and large eddy current loss of the rotor, the problem of high self-discharge rate caused by the permanent magnet suspended flywheel rotor, and the problem of high manufacturing cost caused by winding potting, improving the stability and safety during the use of the flywheel energy storage system and reducing the cost of the flywheel energy storage system. Description of the Drawings

[0023] Figure 1 It is a cross-sectional schematic diagram of a concentrated winding stator electro-excited flywheel energy storage motor in an embodiment of the present invention; Figure 2 It is a schematic diagram of a flywheel rotor structure in an embodiment of the present invention; Figure 3 It is a schematic diagram of the rotor core structure in an embodiment of the present invention; Figure 4 It is a schematic diagram of the magnetic conduction core structure in an embodiment of the present invention; Figure 5 It is a schematic diagram of the rotating shaft structure in an embodiment of the present invention; Figure 6 It is a schematic diagram of the stator core, excitation winding, and electromagnetic winding structures in an embodiment of the present invention; Figure 7 It is a schematic diagram of the stator core structure in an embodiment of the present invention; Figure 8 It is a schematic diagram of the sealing cover structure in an embodiment of the present invention; Figure 9The main magnetic flux path diagram provided by the embodiment of the present invention; Figure 10 The cross-sectional schematic diagram of another concentrated winding stator electro-magnetic excitation flywheel energy storage motor of the present invention; Figure 11 The schematic diagram of the integrated structure of the rotor core and the rotating shaft of the present invention; Figure 12 The magnetic flux path diagram of another concentrated winding stator electro-magnetic excitation flywheel energy storage motor of the present invention.

[0024] In all the drawings, the same reference numerals are used to represent the same elements or structures, where: 1 - rotating shaft, 201 - upper magnetic guiding core, 202 - lower magnetic guiding core, 3 - rotor core, 4 - stator core, 401 - inner open slot, 402 - outer open slot, 5 - electromagnetic winding, 6 - excitation winding, 701 - upper end cover, 702 - lower end cover, 8 - machine shell, 901 - upper magnetic guiding ring, 902 - lower magnetic guiding ring, 10 - L-shaped sealing cover, 11 - pin, 12 - mechanical bearing, 13 - bearing seat, 14 - first magnetic flux path, 15 - second magnetic flux path, 16 - third magnetic flux path, 17 - fourth magnetic flux path. Detailed implementation manners

[0025] In order to make the objectives, technical solutions and advantages of the present invention clearer and more understandable, the present invention will be 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 invention and are not used to limit the present invention. In addition, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0026] As Figure 1 shown and in combination with Figures 2 - 8 , the flywheel energy storage motor in this embodiment will be described in detail. The electro-magnetic excitation flywheel energy storage motor of the present invention mainly includes: rotating shaft 1, upper magnetic guiding core 201, lower magnetic guiding core 202, rotor core 3, stator core 4, electromagnetic winding 5, excitation winding 6, upper end cover 701, lower end cover 702, machine shell 8, upper magnetic guiding ring 901, lower magnetic guiding ring 902, L-shaped sealing cover 10, pin 11, mechanical bearing 12, bearing seat 13.

[0027] Specifically, Np tooth grooves are provided on the outer side of the rotor core 3, where N is an integer greater than or equal to 1, and p is the number of rotor pole pairs, and the shape of the tooth grooves is arc-shaped, trapezoidal, rectangular or functional curve shape.

[0028] Specifically, an air gap is formed between the lower surface of the upper magnetic conductive ring 901 and the upper surface of the upper magnetic conductive core 201, and an air gap is formed between the upper surface of the lower magnetic conductive ring 902 and the upper surface of the lower magnetic conductive core 202.

[0029] Specifically, the electromagnetic winding 5 is a single set of winding structure and penetrates through the stator core 4.

[0030] Specifically, the rotating shaft 1 and the rotor core 3 can be non-integrated structures.

[0031] Specifically, the rotating shaft 1, the upper magnetic conductive core 201, the lower magnetic conductive core 202, the rotor core 3, the upper end cover 701, the lower end cover 702, and the machine shell 8 are all made of ferromagnetic materials.

[0032] In this embodiment, the exciting winding 6 is wound around the teeth on the outside of the stator core 4, which can effectively increase the heat dissipation coefficient of the exciting winding 6, and further reduce the temperature rise of each component of the motor.

[0033] In this embodiment, during charging and discharging, the first magnetic flux path 14 and the second magnetic flux path 15 of the motor are as Figure 9 shown. The first magnetic flux path 14 is: flywheel → rotor core → main air gap → stator → machine shell → upper end cover → upper magnetic conductive ring → axial air gap → upper magnetic conductive core → flywheel. The magnetic flux acts on the upper surface of the upper magnetic conductive core to provide an axially upward electromagnetic force for the flywheel rotor to partially offset or completely offset the gravity of the rotor core of the flywheel, thereby reducing the load borne by the mechanical bearing unit. When the exciting winding is not energized, there is no magnetic flux in the stator core, the flywheel, and the magnetic conductive ring. Therefore, the motor has no no-load standby loss, thereby improving the energy conversion efficiency of the motor.

[0034] In this embodiment, the exciting winding 6 and the electromagnetic winding 5 on the stator core 4 are sealed by an L-shaped sealing cover 10 instead of using potting, which can effectively reduce the manufacturing cost of the motor.

[0035] It can be understood that in this embodiment, the motor has no electromagnetic loss during energy storage standby, and the energy conversion rate is high. The flywheel rotor can receive a stable suspension force throughout the charging and discharging process, reducing the load and loss of the bearing, and the service life of the bearing is long. The heat dissipation coefficient of the exciting winding is relatively high, and the rotor core poles are made of silicon steel sheet materials, which can effectively reduce the temperature rise of each component of the motor. The flywheel is made of alloy steel, the overall structure of the motor is simple, compact, and the cost is low. The rotor dynamics characteristics are good, and it is convenient for processing, which is very suitable for flywheel energy storage applications.

[0036] Embodiment 2: On the basis of a concentrated winding stator electro-excited flywheel energy storage motor in Embodiment 1, the present invention will be further described and described below.

[0037] A concentrated winding stator electro-excited flywheel energy storage motor includes: The vertically installed flywheel rotor includes a rotating shaft 1, an upper guide magnetic core 201, a lower guide magnetic core 202, and a rotor core 3. The upper guide magnetic core 201 and the lower guide magnetic core 202 are provided on the rotating shaft 1, and the rotor core 3 is provided between the upper guide magnetic core 201 and the lower guide magnetic core 202; A stator core 4, an electromagnetic winding 5, and an exciting winding 6 are arranged around the outside of the flywheel rotor. There are open slots on both the inner and outer sides of the stator core 4. The electromagnetic winding 5 is placed in the open slot on the inner side of the stator core 4, and the exciting winding 6 is placed in the open slot on the outer side of the stator core 4; In this embodiment, the stator core 4 includes an outer open slot 402 and an inner open slot 401, and the number of the inner open slots 401 is greater than the number of the outer open slots 402; An upper end cover 701 and a lower end cover 702 are respectively arranged on the upper and lower sides of the flywheel rotor; The magnetic conducting ring includes an upper magnetic conducting ring 901 and a lower magnetic conducting ring 902, and the upper magnetic conducting ring 901 and the lower magnetic conducting ring 902 are respectively installed on the upper end cover 701 and the lower end cover 702; An L-shaped sealing cover 10. One end of the L-shaped sealing cover 10 is embedded into the groove inside the boss of the upper end cover 701 for sealing, and the other end is fixed to the inside of the boss of the lower end cover 702 for sealing. Both the upper and lower ends of the L-shaped sealing cover 10 are reinforced with pins 11; A mechanical bearing unit 12 is used to connect the bearing seat 13 and the rotating shaft 1 of the flywheel rotor, and the bearing seat 13 is made of non-ferromagnetic material.

[0038] In this embodiment, it further includes a machine housing 8. The machine housing 8 is fixed between the upper end cover 701 and the lower end cover 702 and surrounds the outside of the stator core 4.

[0039] In this embodiment, Np tooth grooves are provided on the outside of the rotor core 3, where N is an integer greater than or equal to 1, and p is the number of rotor pole pairs.

[0040] In this embodiment, an air gap is formed between the lower surface of the upper magnetic conducting ring 901 and the upper surface of the upper guide magnetic core 201, and an air gap is formed between the upper surface of the lower magnetic conducting ring 902 and the upper surface of the lower guide magnetic core 202.

[0041] In this embodiment, the electromagnetic winding 5 is a single set of winding structure and penetrates through the stator core 4.

[0042] In this embodiment, the rotating shaft 1 and the rotor core 3 can be an integrated structure or made of different materials, and the rotor core 3 and the upper guide magnetic core 201 or the lower guide magnetic core 202 can be made of different materials.

[0043] In this embodiment, a direct current excitation current flows through the excitation winding 6 during charging and discharging, and the direct current excitation stops during energy storage retention.

[0044] In this embodiment, the electric excitation flywheel energy storage motor can solve the problems of high motor temperature rise caused by low heat dissipation coefficient of the excitation winding and large rotor eddy current loss, the problem of high self-discharge rate caused by the permanent magnet suspended flywheel rotor, and the problem of high manufacturing cost caused by winding potting, improve the stability and safety during the use of the flywheel energy storage system, and reduce the cost of the flywheel energy storage system.

[0045] Embodiment 3: As Figure 10 or Figure 11 shown, the rotating shaft 1, the rotor core 3, the upper magnetic guide core 201, and the lower magnetic guide core 202 in the vertically installed flywheel rotor are of an integrally formed structure. The upper end cover is composed of the upper end cover 701 and the upper magnetic guide ring 901 in Embodiment 2, and the lower end cover is composed of the lower end cover 702 and the lower magnetic guide ring 902 in Embodiment 2, both forming a boss structure, with better integrity. An air gap is formed between the lower surface of the boss of the upper end cover and the upper surface of the flywheel rotor, and an air gap is formed between the upper surface of the boss of the lower end cover and the lower surface of the flywheel rotor.

[0046] During charging and discharging, the third magnetic flux path 16 and the fourth magnetic flux path 17 of the motor, as Figure 12 shown, the third magnetic flux path 16 is: flywheel → rotor core → main air gap → stator → machine shell → upper end cover → axial air gap → flywheel. The magnetic flux acts on the upper surface of the flywheel rotor to provide an axially upward electromagnetic force for the flywheel rotor to partially or completely offset the gravity of the flywheel rotor, thereby reducing the load borne by the mechanical bearing unit. Consistent with Embodiment 2, when the excitation winding is not energized, there is no magnetic flux in the stator core, the flywheel, and the magnetic guide ring, so the motor has no no-load standby loss, thereby improving the energy conversion efficiency of the motor.

[0047] It can be understood that in Embodiments 2 and 3, the motor has no electromagnetic loss during energy storage standby and has a high energy conversion rate. The flywheel rotor can receive a stable suspension force throughout the charging and discharging process, reducing the load and loss of the bearing, and the bearing has a long service life. The excitation winding is placed near the machine shell, with a relatively high heat dissipation coefficient, which can effectively reduce the temperature rise of each component of the motor. The flywheel is made of alloy steel, the overall structure of the motor is simple, compact, low in cost, has good rotor dynamics characteristics, is convenient for processing, and is very suitable for flywheel energy storage applications.

[0048] In summary, the present invention not only reduces the temperature rise of each component of the flywheel energy storage motor and reduces the self-discharge rate of the flywheel energy storage motor, but also improves the economy and safety of the flywheel energy storage system.

[0049] Those skilled in the art can easily understand that the above are only the preferred embodiments of the present invention, and are not intended to limit the present invention. Any modifications, equivalent replacements, and improvements made within the spirit and principles of the present invention shall be included within the protection scope of the present invention.

Claims

1. A concentrated winding stator electro-excited flywheel energy storage motor, comprising a flywheel rotor, characterized in that, The flywheel rotor is vertically installed and includes a rotating shaft (1), an upper magnetic guiding core (201), a lower magnetic guiding core (202), and a rotor core (3). The upper magnetic guiding core (201) and the lower magnetic guiding core (202) are arranged on the rotating shaft (1), and the rotor core (3) is arranged between them. Surrounding the outside of the flywheel rotor, it includes a stator core (4), an electromagnetic winding (5), and an exciting winding (6). Open slots are provided on both the inner and outer sides of the stator core (4) for placing the electromagnetic winding (5) and the exciting winding (6) respectively. Upper and lower end covers (701, 702) are respectively arranged on both sides of the flywheel rotor. An upper magnetic guiding ring (901) and a lower magnetic guiding ring (902) are respectively installed on the upper and lower end covers. One end of the L-shaped sealing cover (10) is embedded in the groove of the upper end cover (701) for sealing, and the other end is fixed to the lower end cover (702) for sealing. The upper and lower ends are reinforced by pins (11). Bearing seats (13) are provided on the upper and lower end covers (701, 702). A mechanical bearing unit is arranged inside the bearing seats (13) for connecting the bearing seats (13) and the rotating shaft (1).

2. The concentrated winding stator electro-excited flywheel energy storage motor according to claim 1, wherein: The bearing seats (13) are made of non-ferromagnetic materials.

3. The concentrated winding stator electro-excited flywheel energy storage motor according to claim 1, wherein: It also includes a machine case (8). The machine case (8) is fixed between the upper end cover (701) and the lower end cover (702) and surrounds the outside of the stator core (4).

4. The concentrated winding stator electro-excited flywheel energy storage motor according to claim 1, wherein: There are Np tooth grooves provided on the outside of the rotor core (3), where N is an integer greater than or equal to 1, and p is the number of rotor pole pairs.

5. The concentrated winding stator electro-excited flywheel energy storage motor according to claim 1, wherein: An air gap is formed between the lower surface of the upper magnetic guiding ring (901) and the upper surface of the upper magnetic guiding core (201), and an air gap is formed between the upper surface of the lower magnetic guiding ring (902) and the upper surface of the lower magnetic guiding core (202).

6. The concentrated winding stator electro-excited flywheel energy storage motor according to claim 1, wherein: The electromagnetic winding (5) is a single set of winding structure and penetrates through the stator core (4).

7. The concentrated winding stator electro-excited flywheel energy storage motor according to claim 1, wherein: The rotating shaft (1) and the rotor core (3) can be an integral structure or made of different materials. The rotor core (3) and the upper magnetic guiding core (201) or the lower magnetic guiding core (202) can be made of different materials.

8. The concentrated winding stator electro-excited flywheel energy storage motor according to claim 1, wherein: The rotating shaft (1), the upper magnetic guiding core (201), the lower magnetic guiding core (202), the rotor core (3), the upper end cover (701), the lower end cover (702), the machine case (8), the upper magnetic guiding ring (901), and the lower magnetic guiding ring (902) are all made of ferromagnetic materials.

9. The concentrated winding stator electro-excited flywheel energy storage motor according to claim 1, wherein: The exciting winding (6) conducts a DC exciting current during charging and discharging and stops the DC excitation during energy storage and holding.

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