Eco-friendly generator using multi-phase winding-active drive motor

Abstract

A linear generator integrates an electric machine that independently controls a stator and a mover having multi-phase windings with a free piston engine (FPE) internal combustion engine. The eco-friendly generator according to the present invention has a relatively simple structure in terms of machinery, thereby achieving an eco-friendly generator with high reliability and durability, very high fuel / energy efficiency with respect to weight-volume, and high output. In addition, the motor can implement strong spring and damper functions, thereby enabling an environmentally friendly generator that does not require additional physical springs and dampers to be implemented.

Description

TECHNICAL FIELD

[0001] The present application relates to an environmentally friendly generator, and more particularly, to a linear generator that combines a motor having a stator and a mover both of which are composed of a multi-phase winding with a Free-Piston Engine (FPE) internal combustion engine, which is an environmentally friendly generator having a high-output, high-efficiency motor and an internal combustion engine using environmentally friendly fuel. BACKGROUND

[0002] A prime mover type engine is composed of a piston-crankshaft in order to obtain output, and a Free-Piston Engine (FPE) is an internal combustion engine that is not limited by the mechanical connection of a crankshaft to a piston. Since the FPE does not have a crankshaft that limits the movement of the piston, mechanical friction loss is small. In addition, the FPE can freely adjust the piston compression ratio, and thus, compared to a car type engine that performs rotational motion, can convert chemical energy into electrical energy with higher efficiency. In addition, the FPE can also use compressed air, bio-fuel (alcohol), hydrogen, gasoline, and various other energy sources (fuels), and thus, can also operate as an environmentally friendly generator.

[0003] However, the existing linear generator (Linear Alternator) mainly uses a motor using a permanent magnet for a generator, but such a motor using a permanent magnet has limitations in terms of output. In addition, such a linear generator requires additional mechanical structures such as springs and dampers, resulting in an increase in mechanical complexity, thereby causing problems of an increase in weight and volume. SUMMARY

[0004] Problems to be Solved by the Invention

[0005] In order to solve the problems as described above, an object of the present application is to provide a high-efficiency environmentally friendly generator obtained by combining a motor / generator having a stator and a mover both of which are actively driven with a multi-phase winding with an internal combustion engine.

[0006] Means for Solving the Problems

[0007] As one embodiment for achieving the above object, a linear generator according to an embodiment of the present application includes a motor and an internal combustion engine, the motor being characterized by including a stator including a multiphase winding, a mover including a multiphase winding and separated from the stator at a prescribed interval, and a control section that independently controls a first magnetic field of the stator and a second magnetic field of the mover, the control section independently controlling the first magnetic field and the second magnetic field so that the first magnetic field of the stator and the second magnetic field of the mover are coupled to each other, the internal combustion engine being constituted by at least one cylinder, at least one piston coaxially aligned with the cylinder and freely moving within the cylinder, and at least one combustion chamber defined by the piston and the cylinder and used for combusting fuel.

[0008] Effects of the Invention

[0009] Thus, by the means for solving the above problem, the following effects are expected.

[0010] The environmentally friendly generator according to the present application is realized by fusing a motor / generator having a stator and a mover with a multiphase winding with an FPE. This environmentally friendly generator has a relatively simple structure in terms of mechanics, and thus realizes an environmentally friendly generator having high reliability and durability and a very high output and energy conversion efficiency relative to weight and volume. In addition, the environmentally friendly generator according to the present application has a high energy yield, and also realizes a wide energy harvesting range. The motor can realize a strong spring and damper function, and thus realizes an environmentally friendly generator without an additional physical spring and damper. BRIEF DESCRIPTION OF DRAWINGS

[0011] Figure 1 is a block diagram of a linear motor in a motor according to an embodiment of the present application.

[0012] Figure 2 is a schematic first conceptual diagram regarding a generator using a motor according to an embodiment of the present application.

[0013] Figure 3 is a schematic second conceptual diagram regarding a generator using a motor according to an embodiment of the present application.

[0014] Figure 4 is a schematic third conceptual diagram regarding a generator using a motor according to an embodiment of the present application. DETAILED DESCRIPTION

[0015] The advantages and features of the present application and methods of accomplishing the same will become apparent from the embodiments described below with reference to the accompanying drawings. The present application, however, can be embodied in various different forms, not just the embodiments described herein. Rather, the embodiments described herein are provided by way of example only and so as to convey the principles of the present application to those skilled in the art. The present application is defined only by the claims. Throughout the specification, like reference numerals in the drawings refer to the same elements throughout the specification.

[0016] The terms used in the present specification are for the purpose of describing the embodiments and are not intended to limit the present application. In the present specification, unless specifically mentioned in the sentence, the singular form also includes the plural form. The use of "comprises" and / or "comprising" in the specification does not exclude the presence or addition of one or more other constituents, steps, actions and / or elements. In addition, since it is according to the preferred embodiments, the reference numerals presented in the order of description in the drawings are not necessarily limited to the order. Also, in the present specification, in the case where a certain component or part is mentioned or is required without excluding other components or parts, other components or parts can be additionally inserted.

[0017] The descriptions and examples provided in the present specification are presented for the purpose of illustration and are not intended to limit the scope of the appended claims. The present specification should be considered as a description of the principles of the present application and is not intended to limit the claims and / or the spirit and scope of the present application described. Those skilled in the art can modify the present application for specific applications.

[0018] In addition, the embodiments described in the present specification will be described with reference to cross-sectional views and / or plan views as idealized examples of the present application. In the drawings, the thickness of the films and regions is exaggerated for the purpose of effective illustration of the technical content. Therefore, the shape of the examples can be deformed due to manufacturing technology and / or tolerances, etc. Therefore, the embodiments of the present application are not limited to the specific shape illustrated, but also include shape changes due to manufacturing processes. For example, a right-angled region illustrated as a right angle can be a rounded shape or a shape having a prescribed curvature. Therefore, the regions illustrated in the drawings have a schematic property, and the shape of the regions illustrated in the drawings is to illustrate a specific shape of the element region, not to limit the scope of the application.

[0019] The technical problems to be achieved by the present application are not limited to the above-mentioned technical problems, and other technical problems not mentioned can be clearly understood by those skilled in the art of the present application through the following description.

[0020] Figure 1 is a block diagram of a linear motor in a motor according to an embodiment of the present application. In Figure 1 In the generator according to an embodiment of the present application, a multi-phase winding-actively driven motor 200 including a stator 210, a mover 220, and a control section 230 is used.

[0021] The stator 210 and the mover 220 of the multi-phase winding-actively driven motor 200 each include a multi-phase winding 211, 221, and are formed to be separated from each other at a prescribed interval d. The control section 230 independently controls a first magnetic field of the stator 210 and a second magnetic field of the mover 220. By controlling the direction of the current flowing through the multi-phase winding, a magnetic field is formed by the current, and by controlling the current flowing through the multi-phase winding, the speed or direction of the magnetic field can be controlled.

[0022] The control section 230 can control the first magnetic field and the second magnetic field by controlling a first current applied to the multi-phase winding 211 of the stator 210 and a second current applied to the multi-phase winding 221 of the mover 220. In addition, the control section 230 can individually control the phase and amplitude of the first current and the second current.

[0023] The control section 230 can control the motor 200 so that the first magnetic field of the stator 210 and the second magnetic field of the mover 220 are coupled to each other at the initial stage of driving. The control section 230 can control the moving direction of the first magnetic field and the second magnetic field to be the same direction or opposite directions.

[0024] The multi-phase windings 211, 221 arranged in a linear array can be applied to a linear generator / motor. In addition, the array can also have a periodic arrangement structure, and thus can also be applied to a rotary motor.

[0025] There is a small air gap between the stator and the mover, and the mover can freely move while maintaining a certain air gap with the stator as a reference. When a current flows through the multi-phase winding of the stator, a periodic magnetic field is generated in the air gap by the multi-phase winding of the stator. Similarly, when a current flows through the multi-phase winding of the mover, a periodic magnetic field is generated in the air gap by the multi-phase winding of the mover.

[0026] When the multi-phase winding of the stator is excited by a sinusoidal input current having an appropriate phase difference, a moving magnetic field is generated in the air gap, and when the multi-phase winding of the mover is excited by a sinusoidal input current having an appropriate phase difference, a moving magnetic field is generated in the air gap.

[0027] In the case where the mover moves at a constant speed relative to the stator, a moving magnetic field generated by a constant current flowing through the polyphase winding of the mover moves as the mover moves. A sinusoidal wave current flowing through the polyphase winding of the mover generates a moving magnetic field relative to the moving direction of the mover. As the mover moves, the moving magnetic field generated by the mover in the air gap moves at a speed determined by the combination of the speed of the moving magnetic field and the speed of the mover. That is, the speed of the magnetic field generated by the mover in the air gap is the sum or difference of the speed of the mover and the speed of the moving magnetic field.

[0028] The polyphase winding constituting the stator and the mover includes two or more independent windings, and generates a periodic magnetic field in the air gap when a current flows therethrough. The polyphase winding has an integer multiple of a spatial period or a period. In the case where there are two or more phase windings, a second winding is disposed at a fixed angle (phase distance) offset with respect to a first winding. For example, in the case of two-phase windings, it can be shifted by ¼ period (or an electrical angle of 90 degrees), and in the case of three-phase windings, it can be shifted by 1 / 6 period (or an electrical angle of 60 degrees).

[0029] By supplying a current to the winding, the total magnetic field generated by all the windings becomes the vector sum of the magnetic fields generated by the currents flowing through the respective windings. At this time, if the phase and amplitude of the current flowing through the winding are changed, the phase and amplitude of the overall magnetic field can be changed.

[0030] The number of spatial periods of the magnetic field generated by the stator and the mover can be the same. The magnetic fields generated by the mover and the stator through their respective currents are controlled to maintain a state of magnetic field coupling with each other. At this time, the magnetic field generated by the mover maintains a predetermined phase relationship with the magnetic field generated by the stator and pushes or pulls each other. As the phase of the current flowing through the polyphase winding of the stator changes, the phase current of the mover changes while maintaining a predetermined phase relationship with the phase current of the stator. At this time, as the phase of the stator current changes, the magnetic field pattern generated by the stator moves in the air gap. As the magnetic field generated by the stator moves, the magnetic field generated by the mover also moves together, maintaining magnetic field locking.

[0031] In the case where the moving magnetic field generated by the stator and the moving magnetic field generated by the mover have opposite moving directions and the same moving speed, the mover moves at twice the moving speed of the magnetic field generated by the stator. On the other hand, in the case where the moving directions of the moving magnetic fields are the same and the moving speeds are the same, the mover maintains a stopped state.

[0032] If an external force exists that pushes or pulls the mover in the opposite direction of the direction of movement of the mover, mechanical power is transmitted to the mover. When the mover moves due to the external force, a small phase deviation occurs in the current flowing through the polyphase winding of the mover and the stator. The external force will balance with the force generated by the magnetic field and the current on the moving element.

[0033] By independently controlling the phase currents of the stator and the mover, the operating range of the motor according to an embodiment of the present application is wide, and the response time can also be shortened. In addition, compared with a motor including a permanent magnet, the motor according to an embodiment of the present application can flow a large current, thereby being able to generate a larger force to obtain a larger output, and also being able to optimize efficiency. In addition, when the motor according to an embodiment of the present application operates, the response speed is fast, and safety can be easily ensured.

[0034] The generator 100 including the motor according to an embodiment of the present application is a generator that can control a very large force without a gear box. In addition, since there is no physical gear, reliability is high and energy efficiency is also high.

[0035] Figure 2 A schematic first conceptual diagram regarding the environmentally friendly generator 100 incorporating the polyphase winding-primary drive motor 200 according to an embodiment of the present application is shown.

[0036] In Figure 2 In the generator 100, there is a cylinder 240. In the cylinder 240, there is a piston 250 having a constant diameter that is slightly smaller than the inner diameter of the cylinder 240 but is sufficient for the piston 250 to freely move in the axial direction of the cylinder 240. On the other hand, the piston 250 is coaxially aligned with the cylinder 240. In addition, on one side of the cylinder 240, there is a combustion chamber 260 for combusting fuel. The combustion chamber 260 has various volumes according to the position of the piston 250 in the cylinder 240.

[0037] The cylinder 240 is preferably symmetrical with respect to the moving axis of the piston 250. Although a cylinder having a piston with other geometric shapes such as a square or rectangular cross section can be potentially used in order to implement the present application, an arrangement having a piston with a circular cross section is preferred.

[0038] The combustion chamber 260 is arranged with an air intake opening portion 271, an exhaust opening portion 272, and a spark plug 270 including a fuel injection device 273 at the end of the moving path of the piston 250. On the other hand, the positions of the spark plug 270, the air intake opening portion 271, the exhaust opening portion 272, and the fuel injection device 273 are exemplarily shown in order to explain an embodiment of the present application, and such a configuration is not limited thereto.

[0039] On the other hand, the combustion chamber 260 can further include an oxidizer injection device (not shown) so that the air intake process can be omitted, and thus the air intake opening portion 271 can also be omitted. At this time, the oxidizer includes oxygen and air, and the ratio of oxygen / air to fuel is adjusted by the controller according to the required output.

[0040] On the other hand, the spark plug 270 according to an embodiment of the present application can also be replaced by an automatic ignition type according to the injected fuel.

[0041] Hereinafter, the power generation process of the environmentally friendly generator 100 according to an embodiment of the present application will be exemplarily described, but this is not intended to limit the scope of the present application.

[0042] The generator 100 according to an embodiment of the present application is composed of two strokes, an intake exhaust stroke and a compression explosion expansion stroke.

[0043] First, in the intake exhaust stroke, the piston 250 moves toward the BDC (Bottom Dead Center) of the combustion chamber 260 of the cylinder 240, and at the same time, the air intake opening portion 271 and the exhaust opening portion 272 are opened, so that the fresh air is supplied to the combustion chamber 260 while the burned mixture air is discharged. At this time, the multiphase winding-motive generator 200 according to an embodiment of the present application operates as a linear motor.

[0044] Next, in the compression explosion expansion stroke, the piston 250 moved toward the TDC (Top Dead Center) of the combustion chamber 260 by the propulsion of the motor 200, and at the same time, the air intake opening portion 271 and the exhaust opening portion 272 are closed, so that the air in the combustion chamber 260 is compressed. At this time, after the air in the combustion chamber 260 is compressed by the motor 200 according to an embodiment of the present application, fuel is injected into the combustion chamber 260 through the fuel injection device 273, and after the fuel is mixed with the oxidizer (air), the mixture is ignited by the spark plug 270. Thereafter, the mixture in the combustion chamber 260 is burned to generate heat and oxides, and the piston 250 is pushed away by the expansion caused by the heat and oxides in the combustion chamber 260. At this time, the motor 200 according to an embodiment of the present application operates as a generator, so that electric power is generated until the expansion stops.

[0045] The fuel used in the environmentally friendly generator 100 according to an embodiment of the present application can use bio-fuel, hydrogen, and the like, but is not limited thereto. In addition, depending on the fuel used in the environmentally friendly generator 100 according to an embodiment of the present application, the structure of the aforementioned generator 100 can be partially changed, and the corresponding power generation operation process can also be changed.

[0046] On the other hand, the environmentally friendly generator 100 according to an embodiment of the present invention may further include a control device (not shown), which is capable of controlling the moving speed of the piston 250, which affects the power generation efficiency, as well as the expected compression ratio of air and fuel, output, ignition timing, etc. That is, since the stator 210 and the rotor 220 of the motor 200 according to an embodiment of the present invention are actively driven, the speed and acceleration of the motor 200 can be controlled to dynamically set the TDC and BDC, and the ignition timing can be adjusted to improve the combustion efficiency of air and fuel, thereby optimizing efficiency.

[0047] Furthermore, according to an embodiment of the present invention, the motor 200 can also operate as a linear reciprocating motor, using a free-piston engine to compress air to store energy, and using the stored compressed air to generate electricity. That is, it can also use environmentally friendly renewable electricity, storing compressed air in a tank and using the stored compressed air to generate electricity to supply power.

[0048] Figure 3 A schematic second concept diagram of an environmentally friendly generator 100 incorporating a multiphase winding-active drive motor 200 according to an embodiment of the present invention is shown.

[0049] exist Figure 3 In the generator 100, an opposed piston 251 and 252 are provided within a cylinder 240. The pistons 251 and 252 have a constant diameter slightly smaller than the inner diameter of the cylinder 240, but sufficient to allow free movement of the pistons 251 and 252 along the length of the cylinder 240. Furthermore, the pistons 251 and 252 are coaxially aligned with the cylinder 240. Additionally, a combustion chamber 260 for burning fuel is located at the center of the cylinder 240. An intake opening 271, an exhaust opening 272, and a spark plug 270 including a fuel injection device 273 are arranged within the combustion chamber 260. The positions of the spark plug 270, the intake opening 271, the exhaust opening 272, and the fuel injection device 273 are illustrative examples for illustrating one embodiment of the invention and are not limited to this configuration. Furthermore, the spark plug 270 according to an embodiment of the invention may be omitted in the case of automatic ignition.

[0050] A generator 100 according to an embodiment of the present invention performs a... Figure 2 The generator 100 of the first concept illustrated operates similarly. On the other hand, the power generation process can also be changed depending on the fuel and structure used in the environmentally friendly generator 100 of one embodiment of the present invention.

[0051] Figure 4A schematic third conceptual diagram of the environmentally friendly generator 100 incorporating the multiphase winding-motive drive motor 200 according to an embodiment of the present application is shown.

[0052] In Figure 4 the dual pistons are combined into one piston 255 within the cylinder 240 that is sealed within the generator 100. The piston 255 has a constant diameter that is slightly smaller than the internal diameter of the cylinder 240, but is sufficient to allow the piston 255 to move freely along the length of the cylinder 240. The piston 255 is coupled to separate combustion chambers 263, 265 on either end. Alternatively, a mechanical linkage (not shown) can be used to couple the two pistons together in order to ensure symmetrical piston action.

[0053] The generator 100 according to an embodiment of the present application operates in a similar manner as the previously described embodiments. Alternatively, the operation of the generator 100 according to an embodiment of the present application can vary depending on the fuel and structure used.

[0054] Alternatively, the opposed piston configuration is advantageous in terms of system balance and vibration compared to other types of free piston engines, and there is no cylinder head, so heat transfer losses are reduced, allowing for high scavenging efficiency.

Claims

1. A linear generator, characterized in that, Including electric motors and internal combustion engines, The motor includes: Stator, including multiphase windings; The mover, comprising multiphase windings, is separated from the stator at a predetermined interval; and The control unit independently controls the first magnetic field of the stator and the second magnetic field of the rotor. The control unit maintains the coupling between the first magnetic field of the stator and the second magnetic field of the mover, and independently controls the first magnetic field and the second magnetic field. The internal combustion engine includes: At least one cylinder; At least one piston, coaxially aligned with and movable within the cylinder; and At least one combustion chamber for burning fuel within the space formed by the piston and the cylinder.

2. The linear generator according to claim 1, characterized in that, The control unit controls the first magnetic field and the second magnetic field by controlling the first current applied to the multiphase winding of the stator and the second current applied to the multiphase winding of the mover.

3. The linear generator according to claim 2, characterized in that, The control unit independently controls the phase and amplitude of the first current and the phase and amplitude of the second current.

4. The linear generator according to claim 1, characterized in that, The combustion chamber includes at least one opening.

5. The linear generator according to claim 4, characterized in that, The opening includes at least one air intake opening.

6. The linear generator according to claim 4, characterized in that, The opening also includes at least one oxidant injection device.

7. The linear generator according to claim 4, characterized in that, The opening includes at least one exhaust opening.

8. The linear generator according to claim 1, characterized in that, The combustion chamber includes at least one spark plug.

9. The linear generator according to claim 8, characterized in that, The spark plug also includes at least one fuel injection device.

10. The linear generator according to claim 1, characterized in that, The pistons consist of a pair. The combustion chamber is formed by the space created by the cylinder and the pair of pistons. Each of the pair of pistons is coupled to the motor located at the end furthest from the combustion chamber.

11. The linear generator according to claim 10, characterized in that, The combustion chamber is disposed between the pair of pistons.

12. The linear generator according to claim 11, characterized in that, When the pair of pistons approaches each other, the volume of the combustion chamber decreases; when the pair of pistons moves away from each other, the volume of the combustion chamber increases.

13. The linear generator according to claim 1, characterized in that, The piston is a one-piece piston structure consisting of two pistons.

14. The linear generator according to claim 13, characterized in that, The combustion chamber comprises two combustion chambers separated by the piston.

15. The linear generator according to claim 14, characterized in that, If the volume of one combustion chamber increases according to the direction of piston movement, the volume of the other combustion chamber decreases.

16. The linear generator according to claim 14, characterized in that, Each of the two separated combustion chambers includes at least one opening.

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