Flywheel energy conversion device

Abstract

The invention provides flywheel energy conversion equipment. The flywheel energy conversion equipment comprises a mounting seat, a linear module and two balancing weights, the mounting base is used for being connected with a rotating shaft and comprises at least two bearings. The linear module is connected with the mounting seat and comprises at least one screw rod; the at least one screw comprises a screw shaft and two nuts. And the screw shaft is connected with at least two bearings. The screw shaft is provided with a middle section as well as a rift thread section and a reverse thread section which are positioned on two sides of the middle section; the two nuts are in threaded connection with the rift thread section and the reverse thread section respectively. The two balancing weights are connected with the two nuts correspondingly and synchronously move along the screw shaft along with the rotating speed of the flywheel device. And in the accelerated rotation process of the flywheel device, the two balancing weights are synchronously far away from the middle section along with the increase of the rotating speed. In the inertia rotation process of the flywheel device, the two balancing weights synchronously approach the middle section along with reduction of the rotating speed.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of energy conversion devices, in particular to a flywheel energy conversion device. BACKGROUND

[0002] A flywheel energy conversion system is a method of converting the energy stored in a flywheel into electrical energy. The flywheel energy conversion system is driven by external force (such as wind power, water power, animal power or motor driving, etc.) to rotate the flywheel to store energy in the flywheel through rotational kinetic energy, in other words, the energy stored in the flywheel is directly proportional to the rotational speed of the flywheel.

[0003] Currently, in order to maintain the rotational potential energy of the flywheel, for example, US Patent No. 10,122,240 discloses a low-energy power generation device which uses two motors to maintain the inertial operation of the flywheel, and sets a generator set on the flywheel to achieve power generation effect. However, such design not only has complex mechanism, but also needs to consider the configuration of the generator and the arrangement of the line, which increases the difficulty of design, assembly, maintenance and repair of the flywheel.

[0004] In addition to the relationship between the rotational speed of the flywheel and the rotational potential energy, the mass of the flywheel also affects the rotational potential energy accumulated by the flywheel. The flywheel is divided into two types: fixed rotational torque and variable rotational torque. The mass of the flywheel with fixed rotational torque is fixed, and the mass of the flywheel with variable rotational torque changes with the rotation process. Although the flywheel with variable rotational torque can dynamically adjust the rotational torque, the dynamically changing rotational torque of the flywheel in the rotation process has a serious balance problem to be overcome. For example, US Patent No. 20220163094 discloses a design method of an inertia ratio self-adaptive adjusting inertia device, which determines the position of the mass block in the radial direction of the flywheel through the balance relationship between the centrifugal force and the spring restoring force to balance the system vibration problem. Limited by the balance problem, the flywheel energy conversion system currently still operates with a fixed flywheel structure. Therefore, the motor driving a flywheel with large mass must consume a large power. If a flywheel with small mass is selected, although the flywheel can be driven with lower power consumption, the energy storage of the flywheel cannot be increased, which is not conducive to energy output. SUMMARY

[0005] In view of the above defects, the flywheel energy conversion device of the present application can dynamically change the counterweight of the overall flywheel device during operation to improve the operating potential energy of the flywheel device.

[0006] To achieve the above object, the flywheel energy conversion device of the present application comprises a mounting base, a linear module and two counterweights. The mounting base is used to connect a rotating shaft and comprises at least two bearings. The linear module is connected to the mounting base and comprises at least one screw rod. The at least one screw rod comprises a screw rod shaft and two nuts. The screw rod shaft of the at least one screw rod is connected to the at least two bearings. The screw rod shaft has a middle section and a right-hand thread section and a left-hand thread section on both sides of the middle section. The two nuts are screwed to the right-hand thread section and the left-hand thread section, respectively. The two counterweights are connected to the two nuts of the at least one screw rod, respectively, and move along the screw rod shaft of the at least one screw rod synchronously with the rotating speed of the flywheel device. During the acceleration of the flywheel device, the two counterweights move away from the middle section synchronously with the increase of the rotating speed. During the inertia rotation of the flywheel device, the two counterweights move towards the middle section synchronously with the decrease of the rotating speed.

[0007] Thus, the flywheel energy conversion device of the present application can use a shorter starting torque to let the two counterweights gradually move away from the middle section of the screw rod shaft and let the mass counterweight of the flywheel device move away from the middle section during the acceleration, so as to increase the energy density of the rotational potential energy by a longer rotational torque and reduce the starting power consumption. Similarly, during the inertia rotation of the flywheel device, the two counterweights gradually move towards the middle section from a farther position, i.e., towards the rotational center, which helps to shorten the rotational torque and reduce the power consumption required for starting or re-acceleration. BRIEF DESCRIPTION OF DRAWINGS

[0008] Figure 1 is a perspective view of the first embodiment of the rotary electric machine of the present application;

[0009] Figure 2 is a cross-sectional view of the rotary electric machine of the present application; Figure 1

[0010] Figure 3 is a partial exploded view of the rotary electric machine of the present application; Figure 1

[0011] Figure 4 is a perspective view of the fan on the left side in the rotary electric machine of the present application; Figure 3

[0012] Figure 5 is a perspective view of the first embodiment of the flywheel device on the right side in the rotary electric machine of the present application; Figure 3

[0013] Figure 6 is a top view of the joint, the mounting base, the first screw rod and the second screw rod of the flywheel device in the rotary electric machine of the present application; Figure 5

[0014] Figure 7 is a schematic view of the two counterweights approaching each other in the flywheel device of the rotary electric machine of the present application; Figure 5 ​​​​​​

[0015] Figure 8 is Figure 5 is a schematic view of two masses of the flywheel device moving away from each other;

[0016] Figure 9 is a schematic view of a second embodiment of the flywheel device;

[0017] Figure 10 is Figure 9 is a schematic view of the coupling, the mounting base, the first screw, the second screw and the two linear slides of the flywheel device;

[0018] Figure 11 is Figure 9 is a schematic view of the flywheel device after assembly;

[0019] Figure 12 and Figure 13 are respectively Figure 11 are respectively

[0020] Figure 14 is a schematic view of a third embodiment of the flywheel device;

[0021] Figure 15 is Figure 14 is an exploded schematic view of the flywheel device of

[0022] Figure 16 and Figure 17 is Figure 14 is a cross-section of the flywheel device of

[0023] Figure 18 is a schematic view of an embodiment of the elastic element chosen as a disc spring module;

[0024] Figure 19 is Figure 18 is a cross-sectional view of

[0025] Figure 20 is Figure 14 is a top view of the mounting base, the screw and the two linear slides of a fourth embodiment of the flywheel device;

[0026] Figure 21 is a cross-sectional schematic view of the screw, for example as a roller screw;

[0027] Figure 22 is Figure 1 is a partial exploded perspective view of the rotating device;

[0028] Figure 23 is a schematic view of the operation of the rotating electric machine in an electric power system, based on Figure 2 ​

[0029] Figure 24 is a sectional view of another embodiment of the rotating device in Figure 11

[0030] Figure 25 is a rotating device for a rotating electric machine application Figure 24 , and a schematic diagram of the rotating device operating in a power system.

[0031] Reference signs are explained as follows:

[0032] 100 - rotating electric machine

[0033] 10 - casing

[0034] 11 - hollow housing

[0035] 13 - bearing seat

[0036] 131 - bearing

[0037] 15 - junction box

[0038] 19 - accommodation space

[0039] 20, 20a - rotating device

[0040] 21, 21a - rotating shaft

[0041] 211 - shaft center

[0042] 23, 23a - rotor

[0043] 30, 30a - first stator

[0044] 40, 40a - second stator

[0045] 50 - fan

[0046] 51 - coupling portion

[0047] 511 - sleeve column

[0048] 513 - nut

[0049] 53 - circular base

[0050] 55 - fan blade

[0051] 60, 60a, 60b, 60c - flywheel device

[0052] 61 - coupling portion

[0053] 611 - sleeve column

[0054] 613 - nut

[0055] ​62, 62a - mounting seat;

[0056] 621, 621a - round bottom plate;

[0057] 623, 623b - ring wall;

[0058] 625 - first bearing;

[0059] 627 - second bearing;

[0060] 629 - mounting cover;

[0061] 63, 63a, 63b - counterweight;

[0062] 631, 631a - main body;

[0063] 633, 633b - positioning slot;

[0064] 635, 635a - wing;

[0065] 637 - assembly slot;

[0066] 64, 64a - first screw rod;

[0067] 64c, 64d - screw rod;

[0068] 641, 641d - screw rod shaft;

[0069] 643, 644, 643a, 644a - ball nut;

[0070] 643d - roller nut;

[0071] 645 - middle section;

[0072] 647, 647d - right-hand thread section;

[0073] 649, 649d - left-hand thread section;

[0074] 65, 65a - second screw rod;

[0075] 651 - screw rod shaft;

[0076] 653, 654, 653a, 654a - ball nut;

[0077] 655 - middle section;

[0078] 657 - right-hand thread section;

[0079] 659 - left-hand thread section;

[0080] 66, 66c - linear slide rail;

[0081] 661 - slide rail;

[0082] 663 - slide block;

[0083] 67, 67b, 67c - elastic element;

[0084] 671 - first spring;

[0085] 672 - second spring;

[0086] 671c - spring strut;

[0087] 673c - disc spring;

[0088] 70 - heat dissipation end cover;

[0089] 700, 700a - power system;

[0090] 701, 701a - control device;

[0091] 703, 703a - voltage stabilizing device;

[0092] 705, 705a - terminal device;

[0093] 707, 707a - external power supply. DETAILED DESCRIPTION

[0094] Before the present invention is disclosed and described, it is to be understood that terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting unless otherwise specified. It is further understood that where the disclosure is considered to be a method, any sequence in the disclosure can be performed in any order.

[0095] The following word "electrically connected" is a usage of a generic concept, which can include connecting any known electrical element or multiple electrical elements between two elements in order to achieve a better effect.

[0096] As Figures 1 to 3As shown, the rotating electrical machine 100 of the present application can perform an acceleration (motor) mode and a power generation mode. The acceleration mode is the operation of the rotating electrical machine 100. The power generation mode represents that the rotating electrical machine 100 can provide electric energy or power to the outside. Therefore, the rotating electrical machine 100 can be applied to a power generation environment, an electric vehicle (such as a car, a truck, an airplane, a ship, or a drone), a charging station, and other environments requiring power storage or power generation.

[0097] The rotating electrical machine 100 can also be referred to as a flywheel energy conversion device to accumulate rotational potential energy of a flywheel and convert the rotational potential energy of the flywheel into electric energy. The rotating electrical machine 100 includes a housing 10, a rotating device 20, a first stator 30, a second stator 40, a fan 50, and a flywheel device 60.

[0098] The housing 10 includes a hollow shell 11, two bearing seats 13, and two terminal boxes 15. The two bearing seats 13 are connected to the hollow shell 11 by screws and are located at the front end and the rear end of the hollow shell 11 to form a containing space 19 inside the hollow shell 11 and between the two bearing seats 13. The two bearing seats 13 each have a bearing 131. The two terminal boxes 15 are connected to the hollow shell 11 by screws, fasteners, hinges, or the like.

[0099] The rotating device 20 passes through the housing and is pivoted to the bearings 131 of the two bearing seats 13 of the housing 10, so that the rotating device 20 can rotate relative to the housing 10 through the bearings 131. The bearings 131 can be air bearings, liquid bearings, or magnetic levitation bearings, etc. to improve the rotational friction of the rotating device 20 and the bearings 131. The rotating device 20 includes a rotating shaft 21 and a rotor 23. The rotating shaft 21 is pivoted to the two bearings 131, and the two ends of the rotating shaft 21 are located outside the two bearing seats 13 of the housing 10. The rotation of the rotating device 20 is around the axis 211 of the rotating shaft 21.

[0100] The rotor 23 is connected to the rotating shaft 21 and is located in the containing space 19. The rotor 23 includes a rotor core stacked by silicon steel sheets, which serves as a magnetic flux path.

[0101] The first stator 30 and the second stator 40 are fixed on the hollow casing 11 of the casing 10, and are located in the accommodating space 19 and between the rotor 23 of the rotating device 20 and the hollow casing 11. The first stator 30 and the second stator 40 are arranged in sequence and spaced apart along the axis of the rotating shaft 21 in the axial direction, that is, the first stator 30 and the second stator 40 are arranged in sequence and spaced apart along the extending axis of the rotating shaft 21 to share the rotor 23. The first stator 30 and the second stator 40 are electrically connected to the two terminal boxes 15 through conductive wires to facilitate wiring from the terminal boxes 15 to deliver electric energy.

[0102] The first stator 30 and the second stator 40 are independent and substantially identical structures, each including a stator core stacked with silicon steel sheets and a plurality of stator windings wound on the stator core. The stator core serves as a magnetic flux path, and the stator windings are wound with conductive wire.

[0103] A fan 50 and a flywheel device 60 are connected to the rotating shaft 21 and are located at two ends of the rotating shaft 21, respectively, so that the fan 50 and the flywheel device 60 are located outside the casing 10, specifically, outside the bearing seat 13 of the casing 10. In this embodiment, the fan 50 can generate a flywheel effect through its volume and weight. The structure of the flywheel device 60 is different from that of the fan 50, which will be described one by one. In other embodiments, the fan 50 can be replaced by the flywheel device 60, or there is only one set of flywheel device 60, without being limited to the drawings.

[0104] As shown in Figure 2 and Figure 4 , the fan 50 includes a connecting portion 51, a circular base 53, and a plurality of fan blades 55. The connecting portion 51 is connected to the circular base 53 and is used to fixedly connect the rotating shaft 21. In this embodiment, the connecting portion 51 includes a sleeve column 511 and a nut 513. The sleeve column 511 is sleeved on the rotating shaft 21, and the nut 513 is screwed on the rotating shaft 21 to fix the sleeve column 511. The center of the shaft hole of the sleeve column 511 overlaps the axis of the rotating shaft 21. In other embodiments, the connecting portion 51 can also have other structures to fixedly connect the rotating shaft 21. The circular base 53 extends outward from around the connecting portion 51, and the connecting portion 51 is located at the center of the circular base 53. The plurality of fan blades 55 are spaced apart and connected to the circular base 53 and are distributed in a radial manner around the connecting portion 51 or the circular base 53. The nut 513 is screwed on the rotating shaft 21 to stably fix the fan 50 on the rotating shaft 21. In this embodiment, the rotating motor 100 further includes a heat dissipation end cover 70 connected to the casing 10 to cover the fan 50. In the rotating process, the fan 50 can also generate air flow through the fan blades 55 to achieve the effect of heat dissipation.

[0105] As shown in Figure 5 and Figure 6As shown, the flywheel device 60 includes a coupling portion 61, a mounting base 62, a linear module, and two counterweights 63. The coupling portion 61 connects the mounting base 62, and is used to fixedly sleeve the rotating shaft 21. In this embodiment, the coupling portion 61 includes a sleeve column 611 and a nut 613. The sleeve column 611 sleeves the rotating shaft 21 through the shaft hole thereof, and the nut 613 is screwed to the rotating shaft 21 to fix the sleeve column 611. The center of the shaft hole of the sleeve column 611 overlaps the axis of the rotating shaft 21. In other embodiments, the coupling portion 61 can also be other structures to fixedly connect the rotating shaft 21. The linear module connects the mounting base 62. The linear module with the screw rod and the linear slide rail will be described later. The two counterweights 63 connect the linear module, and are located at opposite sides of the coupling portion 61. The two counterweights 63 move along the linear extension direction of the linear module to approach or move away from the axis of the rotating shaft 21 synchronously with the rotating speed of the flywheel device 60. Figure 8 As shown, the approaching state of the two counterweights 63 is that the two counterweights 63 synchronously approach the rotating shaft 21 or the coupling portion 61 to reduce the rotating moment. Figure 7 As shown, the moving away state of the two counterweights 63 is that the two counterweights 63 synchronously move away from the rotating shaft 21 or the coupling portion 61 to increase the rotating moment. Each of the two counterweights 63 has a main body 631 and two wings 635. The main body 631 has two positioning grooves 633. The main body 631 of the two counterweights 63 faces the coupling portion 61. The two wings 635 connect the main body 631, and are located at opposite sides of the main body 631. Each of the two wings 635 has an assembly groove 637.

[0106] The coupling portion 61 and the mounting base 62 can be integrally formed by casting. The integrally formed structure and the counterweights 63 can be made of the same or different materials. For example, the integrally formed structure is made of a metal material (for example, steel or carbon steel) with high structural strength, and the counterweights 63 are made of a metal material (for example, lead or copper) with high density. In this way, the present application can meet different system or application requirements by adjusting the material composition of the counterweights 63.

[0107] In this embodiment, the mounting base 62 includes a circular bottom plate 621, a ring wall 623, two first bearings 625, two second bearings 627, and a mounting cover 629. The circular bottom plate 621 extends outward from the periphery of the coupling portion 61. The coupling portion 61 is located at the center of the circular bottom plate 621 of the mounting base 62. The ring wall 623 connects the circular bottom plate 621, and surrounds the circular bottom plate 621. The two first bearings 625 and the two second bearings 627 connect the ring wall 623. The mounting cover 629 connects the ring wall 623.

[0108] The linear module includes a first screw 64 and a second screw 65, and two elastic elements 67. The first screw 64 is pivotally connected to two first bearings 625 for rotation. The second screw 65 is pivotally connected to two second bearings 627 for rotation.

[0109] The two elastic elements 67 are fixedly connected to the main body 631 of the two counterweight blocks 63 by bolts 69, and are partially located in the positioning groove 633. The elastic elements 67, such as springs, disc spring modules, shrapnel, etc., can assist in returning the two counterweight blocks 63 that are far apart to the state of two counterweight blocks 63 that are close to each other, so as to ensure that the two counterweight blocks 63 return to the close state when the flywheel device 60 is stationary or decelerated to a speed lower than the acceleration speed.

[0110] like Figures 6 to 8 As shown, the first screw 64 and the second screw 65 have the same structure. In this embodiment, a ball screw is used as an example. The first screw 64 and the second screw 65 respectively include a screw shaft 641, 651 and two ball nuts 643, 653, 644, 654. The screw shafts 641, 651 of the first screw 64 and the second screw 65 are pivotally connected to two first bearings 625 and two second bearings 627, respectively. The screw shafts 641, 651 have a middle section 645, 655, a longitudinal thread section 647, 657, and a reverse thread section 649, 659. The longitudinal thread sections 647, 657 and the reverse thread sections 649, 659 are located on opposite sides of the middle sections 645, 655, respectively. The ball nuts 643, 653, 644, and 654 are respectively screwed to the longitudinal thread segments 647, 657 and the reverse thread segments 649, 659, and connect the wings 635 of the two counterweights 63, and are located in the assembly groove 637. In the figure, the right counterweight 63 is located in the longitudinal thread segments 647 and 657, and the left counterweight 63 is located in the reverse thread segments 649 and 659. In this way, the rotating device 20 drives the flywheel device 60 to rotate faster, and the two counterweights 63 are subjected to centrifugal force, which drives the ball nuts 643, 644, 653, and 654 to move synchronously along the forward thread segments 647, 657 and the reverse thread segments 649, 659 of the screw shafts 641 and 651, so as to avoid the problem that the two counterweights 63 hit the mounting seat 62 at high speed or separate from the flywheel device 60 during high-speed rotation, and keep the mass rotation center of the flywheel device 60 coaxial with the rotating shaft during rotation, that is, let the two counterweights 63 move synchronously so that the mass rotation center remains at the rotation center of the rotating shaft, so as to improve the vibration and imbalance problems during operation.

[0111] The definition of the forward thread segment and the reverse thread segment is to illustrate that there are two thread configurations in different directions on the screw shaft, rather than to limit the direction.

[0112] As the rotation speed of the rotating shaft 21 of the rotating device 20 increases, the two counterweights 63 of the flywheel device 60 are acted upon by the centrifugal force and move away from the first screw 64 and the second screw 65 synchronously, thereby gradually increasing the rotational torque (the radius between the axis and the counterweight 63) to increase the energy density of the rotational potential energy, and reaching a maximum value when moving away from the flywheel device 60 to approximately close to the annular wall 623 or the end of the screw. Figure 7 As shown, the elastic element 67 is also stretched. The two counterweights 63 move synchronously in a direction generally perpendicular to the axis 211 of the rotating shaft 21, and the first screw 64 and the second screw 65 achieve a deceleration effect. The movement trajectory of the two counterweights 63 is shown by the dotted line in the figure.

[0113] During the inertial rotation of the flywheel device 60, the flywheel device 60 gradually reduces its rotation speed as the rotational potential energy is released, and the centrifugal force on the two counterweights 63 is reduced, so that the two counterweights 63 move synchronously inward along the first screw 64 and the second screw 65 to approach the joint, thereby gradually reducing the rotational torque. Figure 6 In addition to providing a centripetal force in the opposite direction of the centrifugal force, the elastic element 67 can also ensure that the two counterweights 63 are close to their original configuration positions when the length is restored to the original configuration, thereby improving the reliability of the flywheel device 60.

[0114] In other embodiments, in order to make the structure of the flywheel device 60 more stable, as shown in FIG. Figures 9 to 13 As shown, the composition and installation of the flywheel device 60a are roughly the same as those of the aforementioned embodiment. The same parts will not be repeated here. The different parts are as follows. Compared with the two counterweights 63 of the aforementioned embodiment, the two counterweights 63a do not have assembly grooves and positioning grooves. The linear module includes two linear slides 66. The two linear slides 66 are fixedly connected to the circular base plate 621a of the mounting seat 62a and are parallel to the first screw 64a and the second screw 65a. Each linear slide 66 has a slide rail 661 and two sliders 663. The two sliders 663 are connected to the slide rail 661 and can move along the slide rail 661. The wings 635a of the two counterweights 63a are connected to the ball nuts 643a, 644a of the first screw 64a and the ball nuts 653a, 654a of the second screw 65a. The main body 631a of the two counterweights 63a is connected to the sliders 663 of the two linear slides 66. Two elastic elements 67a are fixedly connected to the main bodies 631a of the two counterweights 63a via bolts 69a. Thus, the two counterweights 63a are connected to the first screw 64a, the second screw 65a, and the two linear guides 66. During operation, they are restrained by the first screw 64a, the second screw 65a, and the two linear guides 66. This makes it more difficult for the two counterweights 63a to disengage, making it suitable for heavier loads or other special needs. In other embodiments, the number of linear guides can be as few as one.

[0115] likeFigures 14 to 17 As shown, the composition and installation of the flywheel device 60b are substantially the same as the aforementioned embodiments, and the same parts will not be described again. The difference lies in the arrangement position and number of the elastic elements 67b. In this embodiment, the flywheel device 60b includes four elastic elements 67b, each of which includes a first spring 671 and a second spring 672 inserted into the first spring 671 to increase the elastic support force. In other embodiments, the number of springs can be one or more, and the number of elastic elements 67b can be two or more, without being limited to the number described in this embodiment.

[0116] One end of each of the four elastic elements 67b abuts against the two counterweights 63b, and the other end is used to abut against the ring wall 623b, so that the elastic element 67b is located between the counterweight 63b and the ring wall 623b. In this embodiment, the opening of the positioning groove 633b of each counterweight 63b faces the ring wall 623b, and one end of each of the four elastic elements 67b is located in the positioning groove 633b. When the two counterweights 63b are displaced outward under the action of the centrifugal force, as shown in Figure 17 The four elastic elements 67b are compressed, and then, after inertia rotation or deceleration, the action of the centrifugal force is reduced, so that the compressed four elastic elements 67b release energy, as shown in Figure 16 The two counterweights 63b are synchronously pushed inward to approach the middle section, and the rotational moment is gradually reduced.

[0117] In other embodiments, the elastic element 67c is selected, for example, a disc spring module, as shown in Figure 18 and Figure 19 The disc spring module includes a spring support 671c and a plurality of disc spring sheets 673c. The plurality of disc spring sheets 673c are sleeved on the spring support 671c to form a stacked elastic buffer structure. The disc spring module is applied to the flywheel device, and one end of the spring support 671c is fixed to the ring wall 623b, and the other end is arranged in the positioning groove 633b of the counterweight 63b. Thus, when the counterweight 63b is subjected to the action of the centrifugal force and exerts an axial thrust on the disc spring sheet 673c of the disc spring module, each disc spring sheet 673c is compressed and deformed to store energy. Subsequently, when the centrifugal force of the inertia rotation decreases, each disc spring sheet 673c releases energy to push the counterweight toward the middle section. In the same compression space, the disc spring module can provide greater load than the spiral spring of the aforementioned embodiment.

[0118] As shown in Figure 20As shown, the composition and installation of the flywheel device 60c are substantially the same as the aforementioned embodiments, and the same parts will not be described again. The difference is that the linear module of the flywheel device 60c includes a screw rod 64c and two linear sliding rails 66c. The two linear sliding rails 66c are located on opposite sides of the screw rod 64c and are in parallel relationship with the screw rod 64c. In this way, the flywheel device 60c is applied to a counterweight system with lighter load.

[0119] In addition to the aforementioned ball screw, the screw rod of the flywheel device can also be a roller screw in other embodiments, such as a planetary roller screw, to optimize the load capacity and system stability. Figure 21 As shown, the screw rod 64d can also be a roller screw, such as a planetary roller screw, to optimize the load capacity and system stability. The screw rod 64d includes a screw rod shaft 641d and two roller nuts 643d. The structure of the screw rod shaft 641d is substantially similar to that of the screw rod shafts of the aforementioned embodiments. The two roller nuts 643d are arranged in the forward thread segment 647d and the reverse thread segment 649d, respectively, and are connected to the two counterweights.

[0120] As shown, the first stator 30 and the second stator 40 share the rotor 23 of the rotating device 20. Therefore, the width of the rotor 23 exceeds the sum of the widths of the first stator 30 and the second stator 40. The definition of width is related to the extension direction of the shaft center 211 of the rotating shaft 21. Figure 22 In other embodiments, the number of stators can be more, such as three, four, or more than five. However, no matter how many stators there are, the width of the rotor must be able to meet the condition of exceeding the sum of the widths of all stators.

[0121] In the acceleration mode, the first stator 30 and the second stator 40 drive the rotor 23 of the rotating device 20 synchronously to drive the fan 50 and the flywheel device 60 to operate at a target speed. The acceleration mode can also be referred to as the motor mode to drive the rotating motor 100 to operate.

[0122] When the speed reaches the target speed, the mode is switched from the acceleration mode to the power generation mode. In the power generation mode, the first stator 30 drives the rotor 23 to generate an induced magnetic field, and the fan 50 and the flywheel device 60 rotate by inertia to drive the rotating device 20 to operate, so that the second stator 40 generates induced power. Since the first stator 30 and the second stator 40 share the rotor 23, in the process of driving the rotating device 20 by the flywheel device, the first stator 30 drives the rotor 23 to generate a magnetic field, and the coil of the second stator 40 interacts with the magnetic field of the rotor 23 to generate an induced magnetic force to generate power. The power of the induced power is positively correlated with the speed of the rotating device 20 and the flywheel device, that is, the faster the speed, the greater the power.

[0123]

[0124] ​In other embodiments, the number of stators can be greater, such as three, four, or five, and is not limited to the embodiment described herein. When the number of stators increases, the number of junction boxes will also increase accordingly for connecting wires.

[0125] like Figure 23 As shown, when a rotating electrical machine 100 is operated or applied to an electric power (power supply or energy storage) system 700, the electric power system 700 includes the rotating electrical machine 100, a control device 701, a voltage stabilizing device 703, and a terminal device 705. The first stator 30 and the second stator 40 of the rotating electrical machine 100 are electrically connected to the controller 701 and an external power source 707, such as a mains electricity source. The second stator 40 is also electrically connected to the voltage stabilizing device 703, which is in turn electrically connected to the terminal device 705. The rotating electrical machine 100 can be a single-phase or multi-phase system, such as a three-phase system. In this embodiment, a 10 horsepower (HP) rotating electrical machine 100 is used for illustration.

[0126] During initial startup, the rotating electrical machine 100 is operated in acceleration mode. Specifically, the control device 701 controls the power supplied by the external power supply 707 to the first stator 30 and the second stator 40, thereby driving the rotor of the rotating device 20 and synchronously rotating the fan 50 and the flywheel device 60 to a target speed (e.g., 3600 rpm). During this process, the two counterweights 63 of the flywheel device 60 begin at minimum rotational torque. Therefore, the first stator 30 and the second stator 40 can start with a lower starting power to reduce power burden. As the speed increases, the two counterweights 63 gradually move outward until the speed reaches the target speed, at which point the two counterweights 63 reach maximum rotational torque, thereby accumulating the maximum energy density of rotational potential energy. Next, the rotating electrical machine 100 is operated in the power generation mode. Specifically, the control device 701 switches the acceleration mode to the power generation mode, allowing the external power source 707 to supply power to the first stator 30 and interrupting the power supply to the second stator 40. At this point, the fan 50 and the flywheel device 60 continue to rotate by inertia, driving the rotating device 20. The first stator 30 drives the rotor 23 to generate an induced magnetic field. The coils of the second stator 40 interact with the induced magnetic field of the rotor 23 to generate induced electrical energy, which is output to the voltage stabilizing device 703 and the terminal device 705. The voltage stabilizing device 703 stabilizes the induced electrical energy. The terminal device 705 can be a load or a battery. In this embodiment, a battery pack or capacitor is used as an example to store the electrical energy output by the voltage stabilizing device 703.

[0127] However, as the rotational potential energy accumulated by the fan 50 and the flywheel device 60 gradually decreases due to inertial rotation, the speed decreases. Therefore, the two counterweights 63 of the flywheel device 60 gradually reduce their rotational torque from their maximum torque as the centrifugal force decreases, synchronously moving from a position away from the junction toward the junction. When the speed drops from the target speed to the acceleration speed (e.g., 2000 rpm), the two counterweights 63 of the flywheel device 60 are in a position with a shorter rotational torque. The control device 701 switches from the power generation mode to the acceleration mode again, allowing the external power supply 707 to supply power to the first stator 30 and the second stator 40 to increase the speed. This causes the two counterweights 63 of the flywheel device 60 to move away from the junction due to the centrifugal force until the speed returns to the target speed. During this acceleration process, the two counterweights 63 of the flywheel device 60 still start with a lower rotational torque, resulting in the first stator 30 and the second stator 40 consuming less starting power, reducing the power burden and allowing the target speed to be reached more quickly. The fact that the acceleration speed is greater than the static speed (0 rpm) indicates that the two counterweights 63 of the flywheel device 60 are closest to or slightly away from the joint. While the external power supply 707 is supplying power to the first stator 30 and the second stator 40, the power generation mode is not executed and no electrical energy is generated. However, because the rotating device 20, the fan 50, and the flywheel device 60 are all accelerating to the target speed during operation, the electrical energy consumed by the rotating electrical machine 100 (e.g., 7-8 amps) or power is reduced by 20-30% compared to the electrical energy consumed during static startup (i.e., from zero speed to the target speed) (e.g., 10 amps), and the acceleration time is also shorter than during static startup.

[0128] In other embodiments, Figure 24 As shown, this figure is a reference Figure 22 Another embodiment is provided. The composition and structure of the rotating device 20a are substantially the same as those of the aforementioned embodiment, and the common features are not further described. The difference lies in that the rotating device 20a further includes eight permanent magnets 25. The eight permanent magnets 25 are disposed within the rotor 23a and spaced apart around the circumference of the rotating shaft 21a. Adjacent two of the eight permanent magnets 25 are arranged with opposite magnetic poles. In the figure, the adjacent magnetic poles of each permanent magnet 25 facing the outer periphery of the rotor 23a are arranged with north and south poles. In other embodiments, the number of permanent magnets can be greater or lesser, with a greater number, such as ten, twelve, or more, and a smaller number, such as two, four, or six.

[0129] also, Figure 22 The embodiment is applied in the power generation mode. It is necessary to supply power to the first stator to maintain the rotor's induced magnetic field. In order to improve the power generation efficiency and magnetic field stability, the application Figure 25 The rotating device 20a can improve the magnetic flux density of the rotor 23a through the configuration of the permanent magnet 25, thereby improving the power generation efficiency.

[0130] In other embodiments, the rotating device 20a with Figure 25 the rotating motor is applied in the power system 700a, as shown in Figure 25 Fig. 7A, in addition to the above-mentioned Figure 23 operation, when the control device 701a is switched to the power generation mode, the rotor 23a can generate electric energy by the magnetic field of the permanent magnet 25 and the coils of the first stator 30a and the second stator 40a, thus, in the power generation mode, the external power source 707a can not supply power to the first stator 30a and the second stator 40a to make the rotor 23a generate the induced magnetic field, and then generate electric energy through the first stator 30a and the second stator 40a, and then, when the power generation mode is switched to the acceleration mode, the control device 701a still synchronously supplies power to the first stator 30a and the second stator 40a to increase the rotating speed of the fan 50 and the flywheel device 60.

[0131] In the above embodiments, the rotating speed and the parameters or values of the consumed power or current are only for illustration, and not for limiting the present application. In the above embodiments, the flywheel device is applied in the rotating motor of the present application, but in other embodiments, the flywheel device can also be applied in other rotating motors or rotating machines, such as single-stator induction motor or single-stator permanent magnet motor, etc.

[0132] In the above embodiments, the rotating motor of the present application is taken as an example of combining two flywheel devices, but in other embodiments, the rotating motor can only combine one flywheel device, and the other end of the rotating shaft can combine other mechanisms or systems that need to be rotated, thus, the rotating motor of the present application is not limited to combining two flywheel devices.

Claims

1. A flywheel energy conversion apparatus, characterized by, The application comprises: a mounting base for connecting a rotating shaft and comprising at least two bearings; a linear module connected to the mounting base and comprising at least one screw rod, the screw rod comprising a screw rod shaft and two nuts, the screw rod shaft of the at least one screw rod being connected to the at least two bearings, the screw rod shaft having a middle section and a right-hand thread section and a left-hand thread section on both sides of the middle section, the two nuts being screwed to the right-hand thread section and the left-hand thread section respectively; and two counterweights connected to the two nuts of the at least one screw rod and moving along the screw rod shaft of the at least one screw rod synchronously with the rotating speed of the flywheel device, wherein during the acceleration of the flywheel device, the two counterweights move away from the middle section synchronously with the increase of the rotating speed, and during the inertia rotation of the flywheel device, the two counterweights move towards the middle section synchronously with the decrease of the rotating speed.

2. The flywheel energy conversion apparatus of claim 1, wherein, The linear module further comprises at least one elastic element connected to the two counterweights and used for allowing the two counterweights to move towards the middle section synchronously when the rotating speed decreases.

3. The flywheel energy conversion apparatus of claim 1, wherein, The mounting base comprises a circular bottom plate and a ring wall connected to the circular bottom plate and surrounding the circular bottom plate, and the two first bearings are connected to the ring wall.

4. The flywheel energy conversion apparatus of claim 3, wherein, The linear module comprises a plurality of elastic elements used for abutting against and located between the two counterweights and the ring wall and used for allowing the two counterweights to move towards the middle section synchronously when the rotating speed decreases.

5. The flywheel energy conversion apparatus of claim 3, wherein, Each of the two counterweights comprises a main body and two wings connected to the main body and located on opposite sides of the main body, and the wings of the two counterweights are connected to the two nuts of the at least one screw rod.

6. The flywheel energy conversion apparatus of claim 1, wherein, The mounting base further comprises a mounting cover connected to the ring wall.

7. The flywheel energy conversion apparatus of claim 1, wherein, The linear module further comprises at least one linear slide rail connected to the mounting base and the two counterweights and parallel to the at least one screw rod.

8. The flywheel energy conversion apparatus of claim 1, wherein, The application further comprises a rotating motor comprising a casing, a rotating device, a first stator and a second stator, the casing having an accommodating space inside, the first stator and the second stator being fixedly connected to the casing and located in the accommodating space, the rotating device being connected to the casing and rotatable relative to the casing and comprising a rotor, wherein the rotating shaft has two terminals, the rotating shaft passes through the casing, the two terminals being located outside the casing, the rotor is connected to the rotating shaft and located in the accommodating space, the first stator and the two stators are arranged along an axis of the rotating shaft and share a sleeve for the rotor, and at least one of the first stator and the second stator generates induced electric energy by using the magnetic field of the rotor when the rotating device operates.

9. The flywheel energy conversion apparatus of claim 8, wherein, The width of the rotor is greater than the sum of the widths of the first stator and the second stator, and the width of the rotor is related to the extension direction of the axis of the rotating shaft.

10. The flywheel energy conversion apparatus of claim 8, wherein, The rotating device comprises a plurality of permanent magnets arranged in the rotor and arranged around the rotating shaft.

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