Flywheel device for flywheel energy conversion equipment

Abstract

To provide a flywheel device for flywheel energy conversion equipment.SOLUTION: A flywheel device for flywheel energy conversion equipment includes a coupling portion, a mounting box, a linear module, and two block-shaped weights. The mounting box is connected to the coupling portion so as to surround the coupling portion. The linear module is disposed in the mounting box. The two block-shaped weights are connected to the linear module and are disposed on sides opposite the coupling portion, and move along the linear module to or away from the coupling portion as the flywheel device rotates. When the rotation of the flywheel device accelerates, the two block-shaped weights move away from the coupling portion as the flywheel device accelerates. When the flywheel device rotates inertially, the two block-shaped weights move to the vicinity of the coupling portion as the flywheel device decelerates.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] The present invention relates to a flywheel energy conversion facility, and more particularly to a flywheel device of a flywheel energy conversion facility. [Background technology]

[0002] A flywheel energy conversion system, that is, a method of converting energy stored in a flywheel into electrical energy, involves rotating a flywheel using external forces such as wind, water, animal power, or the driving force of a motor, and storing the energy in the flywheel. There is a positive correlation between the energy stored in the flywheel and the rotational speed of the flywheel.

[0003] To maintain the rotational energy of the flywheel, the low-power-consumption power generator disclosed in Patent Document 1 maintains the inertia of the flywheel's rotational motion with two motors and generates electricity by installing a generator on the flywheel. However, Patent Document 1 has a complex structure, and the placement and wiring of the generator must be considered, which increases the difficulty of designing, assembling, and maintaining the flywheel.

[0004] The rotational speed of the flywheel is related to the rotational energy, and the mass of the flywheel affects the rotational energy stored in the flywheel. The rotational torque of the flywheel is divided into fixed torque and variable torque. A fixed torque flywheel has a constant mass. The mass of a variable torque flywheel changes with rotation. Although variable torque flywheels allow for the rotational torque to be adjusted during operation, imbalance of the rotational torque that changes as the flywheel rotates can be a serious problem. In contrast, the design method of the inertia ratio adaptive inertia device disclosed in Patent Document 2 determines the position of the mass block in the radial direction of the flywheel by balancing the centrifugal force and the restoring force of the spring, thereby maintaining balance in the vibration of the system. Due to the problem of maintaining balance, current flywheel energy conversion systems are operated by flywheels with fixed structures, and the motors that drive the large mass flywheels consume relatively large amounts of power. When a flywheel with a relatively small mass is used, the flywheel can be driven with a relatively small amount of power consumption, but the energy stored by the flywheel cannot be increased, so it is not useful for energy generation. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] U.S. Patent No. 10,122,240 [Patent Document 2] US Patent Publication No. 20220163094 Summary of the Invention [Problem to be solved by the invention]

[0006] In view of the above-mentioned drawbacks, the main object of the present invention is to provide a flywheel device for a flywheel energy conversion facility that improves the rotational energy of the flywheel device by adjusting the block-shaped weight of the entire flywheel device during rotation. [Means for solving the problem]

[0007] To solve the above-mentioned problems, a flywheel device of a flywheel energy conversion equipment includes a coupling part, a mounting box, a linear module, and two block-shaped weights. The mounting box is connected to the coupling part so as to surround the coupling part. The linear module is disposed in the mounting box. The two block-shaped weights are connected to the linear module and disposed on opposite sides of the coupling part, and move along the linear module toward or away from the coupling part as the flywheel device rotates. When the rotation of the flywheel device accelerates, the two block-shaped weights move away from the coupling part as the flywheel device accelerates. When the flywheel device rotates inertially, the two block-shaped weights move toward the coupling part as the flywheel device decelerates.

[0008] Specifically, in the flywheel device of the flywheel energy conversion equipment according to the present invention, the two block-shaped weights move away from the joint, i.e., the center of rotation, as the flywheel device accelerates. In other words, if the weights of the flywheel device move farther away from the joint, the energy density of the rotational energy can be increased by a relatively large rotational torque. Furthermore, when the flywheel device rotates due to inertia, the two block-shaped weights move from a position far from the joint to a position close to the joint, i.e., the center of rotation, so that the reduced rotational torque can reduce power consumption during startup or re-acceleration. [Brief explanation of the drawings]

[0009] [Figure 1] 1 is a perspective view of a rotating electric machine according to an embodiment of the present invention; [Figure 2] 1 is a cross-sectional view of a rotating electric machine according to an embodiment of the present invention; [Figure 3] 1 is an exploded perspective view of a portion of a rotating electric machine according to an embodiment of the present invention; [Figure 4] FIG. 4 is a perspective view showing the flywheel device on the left side in FIG. 3. [Figure 5] FIG. 4 is an exploded perspective view showing the flywheel device on the right side in FIG. 3. [Figure 6] 6 is a plan view of the flywheel device of FIG. 5 after the joining portion, the first bolt, and the second bolt are mounted in the mounting box, as seen from above. FIG. [Figure 7] FIG. 6 is a plan view of the flywheel device of FIG. 5, showing two block-shaped weights spaced close to each other. [Figure 8] FIG. 6 is a plan view of the flywheel device of FIG. 5, showing a state in which two block-shaped weights are moving farther apart from each other. [Figure 9] FIG. 10 is an exploded perspective view showing a flywheel device according to another embodiment of the present invention. [Figure 10] 10 is a plan view of the flywheel device shown in FIG. 9 after the coupling portion, the first bolt, the second bolt, and the two linear slides are mounted in the mounting box. FIG. [Figure 11] FIG. 10 is a plan view of the flywheel device of FIG. 9 as seen from above. [Figure 12] FIG. 12 is a cross-sectional view taken along line 12-12 in FIG. [Figure 13] FIG. 13 is a cross-sectional view taken along line 13-13 in FIG. [Figure 14] FIG. 2 is an exploded perspective view showing a part of the rotating device of FIG. 1. [Figure 15] FIG. 3 is a cross-sectional view showing a state in which the rotating electric machine and the power system based on FIG. 2 are connected and put into operation. [Figure 16] FIG. 12 is a cross-sectional view of a rotation device (see FIG. 11) according to another embodiment of the present invention, viewed from above. [Figure 17] 17 is a cross-sectional view showing a state in which a rotating electric machine employing the rotating device of FIG. 16 is connected to a power system and put into operation. DETAILED DESCRIPTION OF THE INVENTION

[0010] A rotating electric machine according to the present invention will now be described with reference to the drawings. In the specification, the fixing method, coupling method or connection method relating to the technical features is not limited to the direct method, but may also be an indirect method. Directional terms such as up and down, left and right, top, bottom, inside, outside, etc. are expressed based on the positional relationship between parts in the drawings. The numbers such as first, second, third, etc. do not define technical features but only indicate quantity.

[0011] In the description, the term "electrical connection" is used as a general concept and includes connecting any known electrical component or components between two components to achieve a better effect.

[0012] (One embodiment) The description will be made with reference to FIGS. The rotating electrical machine 100 according to an embodiment of the present invention can operate in an acceleration (motor) mode and a generating mode. The acceleration mode is when the rotating electrical machine 100 operates. The generating mode is when the rotating electrical machine 100 provides electrical energy or power to the outside world. That is, rotating electric machine 100 is applicable to power generation environments, electric vehicles (cars, trucks, airplanes, ships, drones, etc.), charging stations, and any environment where power storage or generation is required.

[0013] The rotating electric machine 100, ie, a flywheel energy conversion device, stores rotational energy via a flywheel and converts the rotational energy of the flywheel into electrical energy. The rotating electrical machine 100 comprises a housing 10, a rotating device 20, a first stator 30, a second stator 40 and two flywheel devices 50, 60.

[0014] The housing 10 comprises a hollow chamber 11, two bearing holders 13 and two junction boxes 15. The two bearing holders 13 are separately connected to the front and rear ends of the hollow chamber 11 by screws, and a storage space 19 is formed between the two bearing holders 13 and the interior of the hollow chamber 11. Each of the two bearing holders 13 has a bearing 131. The two junction boxes 15 are connected to the hollow chamber 11 by screws, fittings, turning knobs, or the like.

[0015] The rotation device 20 passes through the housing 10 and is rotatably connected to the bearings 131 of the two bearing holders 13 of the housing 10 , and is therefore capable of rotating relative to the housing 10 via the bearings 131 . The bearing 131 is composed of an air bearing, a fluid bearing, or a magnetic bearing, and improves the frictional force between the rotating device 20 and the bearing 131 during rotation. The rotating device 20 has a rotating shaft 21 and a rotor 23 . The rotating shaft 21 is rotatably connected to two bearings 131 , and two end portions thereof are exposed to the outside of two bearing holders 13 of the housing 10 . The rotation device 20 rotates around the center 211 of the rotation shaft 21 .

[0016] The rotor 23 is connected to the rotating shaft 21 and is mounted within the storage space 19 . The rotor 23 has an iron core made of laminated silicon steel plates, and forms a magnetic path through the iron core.

[0017] The first stator 30 and the second stator 40 are fixed to the hollow chamber 11 of the housing 10 and are located within the storage space 19 and between the rotor 23 of the rotating device 20 and the hollow chamber 11 . The first stator 30 and the second stator 40 are arranged in front-to-back order with a gap between them along the center 211 of the rotation shaft 21 and share the rotor 23 . The first stator 30 and the second stator 40 are electrically connected to the two junction boxes 15 via conductors, and electrical energy is transmitted through the wiring of the junction boxes 15 .

[0018] The first stator 30 and the second stator 40 have the same structure, each having an iron core made of laminated silicon steel sheets and a plurality of stator windings, and forming a magnetic path via the iron core. Each of the stator windings is formed by winding a conductor around an iron core.

[0019] The two flywheel devices 50 and 60 are connected to the rotating shaft 21 and are mounted at the two ends of the rotating shaft 21 and outside the housing 10 . That is, the two flywheel devices 50 and 60 are mounted on the outside of the bearing holder 13 of the housing 10 . In this embodiment, the two flywheel devices 50 and 60 have different structures, but are not limited to this. In another embodiment, the two flywheel assemblies 50, 60 may be identical in construction. The structure of the flywheel devices 50 and 60 will be explained below.

[0020] As shown in FIGS. 2 and 4, the flywheel device 50 has a connecting portion 51, a circular base 53 and a plurality of blades 55. The coupling portion 51 is connected to the circular base 53 and then fixedly connected to the rotary shaft 21 . In this embodiment, the coupling part 51 includes a post-shaped slip 511 and a nut 513 . The shaft hole of the columnar sleeve 511 is fitted onto the rotary shaft 21 . The nut 513 is tightened onto the rotary shaft 21 to fix the columnar sleeve 511 in place. The center of the shaft hole of the columnar sleeve 511 and the center of gravity of the rotary shaft 21 are coaxial. In another embodiment, the coupling portion 51 is fixedly connected to the rotary shaft 21 by another coupling structure. A circular base 53 is formed around the coupling portion 51 and extends outward. The coupling portion 51 is located in the center of the circular base 53 . A plurality of blades 55 are connected to the circular base 53 at intervals and are distributed radially around the joint 51 or the circular base 53 . The nut 57 is tightened onto the rotary shaft 21 to fix the flywheel device 50 to the rotary shaft 21 . In this embodiment, the rotating electrical machine 100 further includes a heat dissipation cap 70 . The heat dissipation cap 70 is attached to the housing 100 to shield the flywheel device 50 . When the flywheel device 50 rotates, an air flow is generated through the blades 55, thereby achieving a heat dissipation effect.

[0021] As shown in FIGS. 5 and 6, the flywheel device 60 includes a coupling portion 61, a mounting box 62, a linear module, and two block-shaped weights 63. The coupling portion 61 is connected to the mounting box 62 and then fixedly connected to the rotary shaft 21 . In this embodiment, the coupling 61 includes a post-shaped slip 611 and a nut 613 . The shaft hole of the columnar sleeve 611 is fitted onto the rotary shaft 21. The nut 613 is tightened onto the rotary shaft 21 to fix the columnar sleeve 611 in place. The center of the shaft hole of the columnar sleeve 611 and the center of gravity of the rotary shaft 21 are coaxial. In another embodiment, the coupling portion 61 is fixedly connected to the rotating shaft 21 by another coupling structure. The linear module is placed in a mounting box 62 . Another embodiment thereafter will explain the portion of the linear module where the ball screw and the linear slide are connected. The two block-shaped weights 63 are connected to the linear module and placed on opposite sides of the connecting portion 61, and move along the linear direction of the linear module toward or away from the center of the rotation axis as the flywheel device 60 rotates. As shown in FIG. 8, the two block-shaped weights 63 move close to the rotation shaft 21 or the connecting portion 61 and reduce the rotation torque. As shown in FIG. 7, the two block-shaped weights 63 move away from the rotary shaft 21 or the connecting portion 61 and increase the rotational torque. Each block-shaped weight 63 has a main body 631 facing the connecting portion 61, positioning grooves 633 formed in the two main bodies 631, wing portions 635 connected to the two main bodies 61, and mounting grooves 637 formed separately in the two wing portions 635.

[0022] The coupling portion 61 and the mounting box 62 are a one-piece cast structure. The integral structure and the block-shaped weight 63 may be made of the same or different materials. If the materials are different, one option is to use a metal material with high structural strength (e.g., steel, carbon steel, etc.) for the integrated structure and a metal material with high density (e.g., lead, copper, etc.) for the block-shaped weight 63. That is, the present invention allows the material of the block weight 63 to be adjusted according to different systems and application ranges.

[0023] In this embodiment, the mounting box 62 has a circular bottom plate 621 , an annular wall 623 , two first bearings 625 , two second bearings 627 and a lid 629 . The circular bottom plate 621 is formed around the joint portion 61 and extends outward. The connecting portion 61 is located in the center of the circular bottom plate 621 . The annular wall 623 is connected to the circular bottom plate 621 and surrounds the circular bottom plate 621 . Two first bearings 625 and two second bearings 627 are disposed on the annular wall 623 . A lid 629 covers the annular wall 623 .

[0024] The linear module has a first ballscrew 64 and a second ballscrew 65 . The flywheel device 60 further includes two elastic members 67 . The first ball screw 64 is rotatably coupled to a first bearing 625 . The second ball screw 65 is rotatably coupled to a second bearing 627 .

[0025] The two elastic members 67 are fixed to the main bodies 631 of the two block-shaped weights 63 by bolts 69 , respectively, and a portion of each is placed in the positioning groove 633 . The two elastic members 67 are made up of springs or strip-shaped elastic bodies and can pull the two separated block-shaped weights 63 back to a close distance from each other, so that when the flywheel device 60 is kept stationary or decelerates from accelerated rotation, the two block-shaped weights 63 can move to a close distance from each other.

[0026] As shown in FIGS. 6 to 8, the first ball screw 64 and the second ball screw 65 have the same structure, and each include a shaft portion 641, 651 and two ball nuts 643, 653, 644, 654. The shaft portion 641 of the first ball screw 64 is rotatably connected to the two first bearings 625 and is composed of an intermediate portion 645 , a right-hand thread portion 647 and a left-hand thread portion 649 . The right-hand threaded portion 647 and the left-hand threaded portion 649 are located on opposite sides of the intermediate section 645 . The shaft portion 651 of the second ball screw 65 is rotatably connected to the two second bearings 627 and is composed of an intermediate portion 655 , a right-hand thread portion 657 and a left-hand thread portion 659 . The right-hand threaded portion 657 and the left-hand threaded portion 659 are located on opposite sides of the intermediate section 655 . The two ball nuts 643 and 644 are fastened to the right-hand threaded portion 647 and the left-hand threaded portion 649 , and are simultaneously mounted in the mounting grooves 637 of the wing portions 635 of the two block-shaped weights 63 . The two ball nuts 653 and 654 are fastened to the right-hand threaded portion 657 and the left-hand threaded portion 659 , and are simultaneously mounted in the mounting grooves 637 of the wing portions 635 of the two block-shaped weights 63 . The right block-shaped weight 63 is mounted on the right threaded portions 647 and 657 . The left block-shaped weight 63 is mounted on the left threaded portions 649 and 659 . The above-mentioned structural features allow the rotation device 20 to accelerate the flywheel device 60. The two block-shaped weights 63 withstand centrifugal force and move the ball nuts 643, 653, 644, 654 along the right-hand threaded portions 647, 657 and left-hand threaded portions 649, 659 of the shaft portions 641, 651, thereby avoiding the problems of the two block-shaped weights 63 colliding with the mounting box 62 or falling out of the flywheel device 60 during high-speed rotation, and maintaining the center of mass and the rotation axis of the rotating flywheel device 60 coaxially. In other words, by aligning the movements of the two block-shaped weights 63, the center of mass of the rotating flywheel device 60 and the center of the rotation axis can be kept coaxial, thereby improving the problems of vibration and imbalance that occur during rotation.

[0027] The right-hand thread portion and the left-hand thread portion are not limited to directions, but indicate that two different directional thread portions are arranged on the ball screw.

[0028] When the flywheel device 60 accelerates as the rotary shaft 21 of the rotating device 20 rotates, the two block-shaped weights 63 withstand the centrifugal force and move outward along the first ball screw 64 and the second ball screw 65, gradually increasing the rotational torque (radius between the center of the shaft and the block-shaped weights 63) and increasing the energy density of the rotational energy. When the two block-shaped weights 63 move near the annular wall 623 or to the end of the ball screw and the rotational torque reaches its maximum value, the elastic member 67 is stretched long, as shown in FIG. 7. The two block-shaped weights 63 move in a direction perpendicular to the center 211 of the rotation shaft 21, and a deceleration effect is produced by the first ball screw 64 and the second ball screw 65. The movement paths of the two block-shaped weights 63 are indicated by dashed lines in the figure.

[0029] When the flywheel device 60 rotates inertially, the rotational speed of the flywheel device 60 gradually decreases as the rotational energy changes, and the centrifugal force received by the two block-shaped weights 63 also gradually decreases. As a result, as shown in Figure 6, the two block-shaped weights 63 move along the first ball screw 64 and the second ball screw 65 toward the rear joint 61, gradually reducing the rotational torque. The elastic member 67 not only provides a centripetal force that opposes the centrifugal force, but also returns to its original length when attached. In other words, it is possible to ensure that the two block-shaped weights 63 are moved close to their original positions, thereby improving the reliability of the flywheel device 60.

[0030] In another embodiment, to stabilize the structure of the flywheel device 60, as shown in FIGS. 9 to 13, a flywheel device 60a has most of the same configuration and mounting manner as the above-described embodiment. The following describes the differences from the above-described embodiment.

[0031] The two block-shaped weights 63 only have a main body 631a and wing portions 635a. The linear module consists of two linear slides 66 . Two linear slides 66 are fixed to the circular bottom plate 621a of the mounting box 62a in parallel with the first ball screw 64a and the second ball screw 65a, respectively, and have a rail 661 and two blocks 663. Two blocks 663 are movably mounted on the rails 661 . The wings 635a of the two block-shaped weights 63a are connected to ball nuts 643a and 644a of the first ball screw 64a and ball nuts 653a and 654a of the second ball screw 65a. The bodies 631 a of the two block-shaped weights 63 a are connected to the blocks 663 of the two linear slides 66 . The two elastic members 67a are fixed to the main bodies 631a of the two block-shaped weights 63a by bolts 69a. According to the above-mentioned structural features, the two block-shaped weights 63 a are coupled with the first ball screw 64 a, the second ball screw 65 a and the two linear slides 66 , and are then pulled by the second ball screw 65 a and the two linear slides 66 . In other words, the two block-shaped weights 63a are not only less likely to deviate but also more suitable for large loads or other special needs. In another embodiment, the number of linear slides is not limited to two but may be one or more.

[0032] In this embodiment, the flywheel devices 50 and 60 have different arrangements, but are not limited to this. In another embodiment, the flywheel devices 50 and 60 may have the same arrangement.

[0033] As shown in FIG. 14, the first stator 30 and the second stator 40 share the rotor 23 of the rotating device 20 . The width of the rotor 23 is greater than the sum of the widths of the first stator 30 and the second stator 40. The width is related to the extension direction of the center 211 of the rotating shaft 21.

[0034] In another embodiment, the number of stators is not limited to two, but may be more than two. Even if the number of stators increases, it is sufficient as long as the width of the rotor is greater than the sum of the widths of all the stators.

[0035] When executing the acceleration mode, the first stator 30 and the second stator 40 simultaneously drive the rotor 23 of the rotating device 20 and rotate the two flywheel devices 50, 60 to a target speed. The acceleration mode is also the motor mode that drives the rotating electrical machine 100 .

[0036] After the rotation speed reaches the target speed, the acceleration mode is switched to the power generation mode. In the generating mode, the rotor 23 rotates with the first stator 30, generating an induced magnetic field. The two flywheel devices 50 and 60 rotate the rotating device 20 by inertial rotation and generate an induced electromotive force in the second stator 40 . Since the first stator 30 and the second stator 40 share the rotor 23, when the flywheel device rotates the rotating device 20, the first stator 30 drives the rotor 23 and generates a magnetic field in the rotor 23, and then an induced electromotive force (potential) is generated by the coil of the second stator 40 and the magnetic field of the rotor 23. The power of the induced electromotive force is positively correlated with the rotation speed of the rotating device 20 and the flywheel device. In other words, the faster the rotation speed, the more power there is.

[0037] In another embodiment, the number of stators is not limited to the above embodiment and may be two or more. When the number of stators increases, the number of connection boxes also increases to accommodate the corresponding wiring.

[0038] As shown in FIG. 15, the rotating electrical machine 100 is applied to a power (supply or storage) system 700 . The power system 700 includes a rotating electric machine 100, a control device 701, a voltage stabilizer 703, and a terminal device 705. The first stator 30 and the second stator 40 of the rotating electric machine 100 are electrically connected to the control device 701 and an external power source 707. The external power source 707 is external or commercial power. The second stator 40 is electrically connected to a voltage stabilizer 703 . The voltage stabilizer 703 is electrically connected to a terminal device 705 . The rotating electrical machine 100 may be a single-phase or multi-phase (eg, three-phase) system. This embodiment will be described using a 10 horsepower (HP) rotating electrical machine 100 as an example.

[0039] Upon initial start-up, the rotating electrical machine 100 operates in an acceleration mode. That is, the control device 701 supplies power to the first stator 30 and the second stator 40 via the external power source 707 to drive the rotor 23 of the rotating device 20 and rotate the flywheel devices 50, 60 up to a target speed (for example, 3600 rpm). In the acceleration mode, the two block-shaped weights 63 of the flywheel device 60 start from the minimum rotational torque. In other words, the first stator 30 and the second stator 40 start with a relatively small starting power, reducing the power burden. As the rotation speed increases, the two block-shaped weights 63 gradually move outward. When the rotation speed reaches the target speed, that is, when the two block-shaped weights 63 reach the maximum rotation torque, the rotation energy with the maximum energy density can be stored. The rotating electrical machine 100 then operates in a generating mode. That is, the control device 701 switches the acceleration mode to the power generation mode, continues supplying power from the external power source 707 to the first stator 30, and cuts off supplying power from the external power source 707 to the second stator 40. At this time, the flywheel devices 50 and 60 rotate the rotating device 20 by inertial rotation, driving the rotor 23 via the first stator 30 to generate an induced magnetic field, and then an induced electromotive force is generated by the coil of the second stator 40 and the induced magnetic field of the rotor 23, which is output to the voltage stabilizer 703 and the terminal device 705. The voltage stabilizer 703 stabilizes the induced electromotive force. The terminal device 705 is a load or a battery. In this embodiment, the electric energy output from the voltage stabilizer 703 is stored in a battery pack and a capacitor.

[0040] The rotational energy stored in the flywheel devices 50, 60 gradually decreases due to inertial rotation. As the rotational energy gradually decreases, the rotational speed decreases, and therefore the two block-shaped weights 63 of the flywheel device 60 gradually decrease the rotational torque from the maximum value as the centrifugal force gradually decreases. That is, the two block-shaped weights 63 move from a position away from the joint portion to the joint portion. When the rotational speed drops from the target speed to the acceleration rotational speed (e.g., 2000 rpm), the two block-shaped weights 63 of the flywheel device 60 are positioned so as to generate a relatively small rotational torque, so the control device 701 switches the power generation mode to the acceleration mode and supplies power from the external power source 707 to the first stator 30 and the second stator 40, thereby increasing the rotational speed of the flywheel device 60 and gradually increasing the centrifugal force. At this time, the two block-shaped weights 63 of the flywheel device 60 are moved far away from the joint by centrifugal force until the rotation speed reaches the target speed. In this acceleration mode, the two block-shaped weights 63 of the flywheel device 60 start from the minimum rotational torque. That is, the first stator 30 and the second stator 40 can be started with a relatively small starting power, reducing the power burden and quickly reaching the target speed. Acceleration is greater than 0 rpm when stationary. That is, the two block-shaped weights 63 of the flywheel device 60 are positioned closest to the connecting portion 61 or are gradually moving away from the connecting portion 61. When the external power source 707 supplies power to the first stator 30 and the second stator 40, the power generation mode is not executed and electrical energy cannot be generated. However, as the rotating device 20 and the two flywheel devices 50, 60 are accelerating to reach the target speed, the amount of electrical energy consumed by the rotating electrical machine 100 (e.g., 7 to 8 amperes) or power is reduced by 20 to 30% compared to starting from a standstill, i.e., the electrical energy required to reach the target speed from 0 (e.g., 10 amperes). The acceleration time is shorter than the start time under stationary conditions.

[0041] In another embodiment, FIG. 16 is a cross-sectional view from above of another embodiment with reference to FIG. Most of the parts and structure of the rotation device 20a are the same as those of the above-described embodiment. The differences from the above-described embodiment are as follows. As shown in FIG. 16, the rotating device 20 a further includes eight permanent magnets 25 . Eight permanent magnets 25 are spaced apart within rotor 23a and around rotation axis 21a. The eight permanent magnets 25 are arranged so that two adjacent permanent magnets have different magnetic poles, and the adjacent magnetic poles facing the rotor 23a are arranged in an alternating north-south pole arrangement. In other embodiments, the number of permanent magnets may be reduced to two, four, six, or increased to ten, twelve, or more than twelve.

[0042] When the embodiment shown in FIG. 14 is applied in a generating mode, power must be supplied to the first stator to maintain the induced magnetic field in the rotor. As shown in FIG. 17, when improving the power generation efficiency and the stability of the magnetic field, the rotating device 20a improves the magnetic flux density of the rotor 23a via the permanent magnet 25, thereby improving the power generation efficiency.

[0043] In another embodiment, when the rotating electric machine 100a employing the rotating device 20a shown in FIG. 16 is applied to a power system 700a, as shown in FIG. 17, the power system 700a operates as shown in FIG. 15 and also executes a power generation mode via a control device 701a. At this time, the rotor 23a generates electric energy by the magnetic field of the permanent magnet 25 and the coils of the first stator 30a and the second stator 40a. In other words, in the power generation mode, the external power source 707a is no longer required to supply power to the first stator 30a and the second stator 40a, generate an induced magnetic field in the rotor 23a, and generate electrical energy via the first stator 30a and the second stator 40a. Subsequently, when the power generation mode is switched to the acceleration mode, the control device 701a supplies electric power to the first stator 30a and the second stator 40a, and accelerates the flywheel devices 50, 60.

[0044] In the above-described embodiment, the parameters or values ​​relating to the rotation speed and power consumption or current are merely examples and do not limit the present invention. In yet another embodiment, the flywheel device is applied to the rotating electric machine of the present invention, but in other embodiments, the flywheel device may be applied to other rotating electric machines or rotating machines, such as single-phase induction motors or permanent magnet synchronous motors.

[0045] In the above-described embodiment, the rotating electric machine of the present invention uses two flywheel devices in combination as an example, but in other embodiments, the rotating electric machine may use only one flywheel device and connect the other end of the rotating shaft to a driven mechanism or system. That is, the rotating electric machine of the present invention is not limited to a combination of two flywheel devices. [Explanation of symbols]

[0046] 100, 100a: rotating electrical machines 10: Housing 11: Hollow chamber 13: Bearing holder 131: Bearing 15: Connection box 19: Storage space 20, 20a: Rotating device 21, 21a: Rotating shaft 211: Center 23, 23a: Rotor 25: Permanent magnet 30, 30a: First stator 40, 40a: Second stator 50: Flywheel device 51:Joining part 511: Column sleeve 513: Nut 53:Circular base 55: Feather 57: Nut 60, 60a: Flywheel device 61:Joining part 611: Column sleeve 613: Nut 62, 62a: Mounting box 621, 621a: circular bottom plate 623: Circular Wall 625: First Bearing 627: Second bearing 629: Attached lid 63, 63a: Block-shaped weight 631, 631a: Main body 633: Positioning groove 635, 635a: wing section 637: Mounting groove 64, 64a: First ball screw 641: Shaft 643, 644, 643a, 644a: Ball nuts 645: Middle part 657: Right-hand thread 649: Left-hand thread 65, 65a: Second ball screw 651: Shaft 653, 654, 653a, 654a ball nuts 655: Middle part 657: Right-hand thread 659: Left-hand thread 66: Linear slide 661: Rail 663: Block 67, 67a: Elastic member 69: Bolt 70: Heat dissipation cap 700, 700a: Power Systems 701, 701a: control device 703, 703a: Voltage stabilizer 705, 705a: Terminal device 707, 707a: External power supply

Claims

1. A coupling part, a mounting box, a linear module and two block-shaped weights are provided, the mounting box is connected to the coupling portion so as to surround the coupling portion, the linear module is disposed in the mounting box; The two block-shaped weights are connected to the linear module, are placed on opposite sides of the connecting portion, and move along the linear module to the vicinity of the connecting portion or move away from the connecting portion as the flywheel device rotates; When the rotation of the flywheel device accelerates, the two block-shaped weights move away from the connecting portion as the flywheel device accelerates, When the flywheel device rotates inertially, the two block-shaped weights move close to the connecting portion as the flywheel device decelerates, the linear module includes a first ball screw, a second ball screw, two first bearings, and two second bearings; The two block-shaped weights are connected to the first ball screw and the second ball screw, the first ball screw and the second ball screw each have a shaft portion and two ball nuts; the shaft portions of the first ball screw and the second ball screw are rotatably coupled to two of the first bearings and two of the second bearings, the shaft portions of the first ball screw and the second ball screw have an intermediate portion and a right-hand thread portion and a left-hand thread portion located on both sides of the intermediate portion, The two ball nuts are fastened to the right-hand thread portion and the left-hand thread portion, respectively; A flywheel device for a flywheel energy conversion facility, characterized in that the two block-shaped weights are respectively connected to the ball nuts of the two ball screws and are installed in the right-hand thread portion and the left-hand thread portion of the first ball screw and the second ball screw.

2. 2. The flywheel device of claim 1, wherein the two block-shaped weights move in a direction perpendicular to the center of the axis of the axial hole of the coupling portion.

3. the mounting box has a circular bottom plate and an annular wall, the annular wall is annularly connected along the circumference of the circular bottom plate, and the two first bearings and the two second bearings are disposed on the annular wall; The connecting portion is located at the center of the circular bottom plate, 2. The flywheel device of claim 1, wherein the linear module has a first ball screw and a second ball screw, the first ball screw is rotatably connected to two of the first bearings, and the second ball screw is rotatably connected to two of the second bearings.

4. Each of the two block-shaped weights has a body and two wings, and the two wings are connected to the body and are located on opposite sides of the body; 4. The flywheel device of claim 3, wherein the two block-shaped weights have their bodies facing the connecting portion and their two wing portions connected to the ball nuts of the two ball screws.

5. 4. The flywheel device of the flywheel energy conversion equipment according to claim 3, characterized in that the linear module has one or more linear slides, and the linear slides are mounted between the circular bottom plate and the two block-shaped weights in parallel with the first ball screw and the second ball screw.

6. further comprising one or more elastic members; 2. The flywheel device of claim 1, wherein the elastic member is connected to two of the block-shaped weights.

7. 4. The flywheel device of claim 3, wherein the mounting box further comprises a lid, the lid covering the annular wall.

8. 2. The flywheel device of claim 1, wherein the coupling portion is disposed at the center of the mounting box.

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