Generator

Abstract

A generator is disclosed. The generator of the present disclosure comprises: a hollow rotor that is elongated and has a magnet, the rotor having a slot formed through the rotor in the longitudinal direction of the rotor and into which the magnet is inserted; a stator that surrounds the side of the rotor on the outside of the rotor and on which a coil is wound; a first end plate coupled to one side of the rotor and covering the slot; a second end plate coupled to the other side of the rotor and covering the slot; and a rotation shaft that provides rotational force, extends in the longitudinal direction of the rotor, and is coupled to the second end plate on the outside of the rotor.

Description

Technology Field

[0001] The present disclosure relates to a generator. In particular, the present disclosure relates to a generator capable of reducing the weight of the rotor and increasing the concentricity between the rotor and the rotating shaft. Background Technology

[0002] Generally, a generator is a device that receives mechanical energy from an external power source and converts it into electrical energy. Examples of such external power sources include turbines, water turbines, electric motors, or gas engines.

[0003] In the case where the external power source of the generator is a gas engine, the reciprocating motion of the gas engine's piston can be converted into rotational motion by a crankshaft connected to a connecting rod. Additionally, when the generator is provided separately from the gas engine, the generator's rotating shaft, which is connected to the crankshaft pulley by a belt, rotates the rotor to induce current in the coil wound on the stator, thereby enabling the generator to produce power.

[0004] Generators according to the prior art have a problem in that the weight of the rotor increases significantly because the rotational shaft is positioned inside the rotor. Furthermore, the weight of the rotor makes it difficult to assemble the generator, and the manufacturing cost of the rotational shaft increases as it extends far into the interior of the rotor. The problem to be solved

[0005] The present disclosure aims to solve the aforementioned problems and other problems.

[0006] Another objective may be to provide a generator that can be lightweight by equipping the rotor with a hollow type.

[0007] Another objective may be to provide a generator with increased ease of disassembly and assembly.

[0008] Another objective may be to provide a generator capable of improving the vibration and noise characteristics of the rotor by increasing the concentricity of the rotor and the rotating shaft provided on the outer side of the rotor and improving the uniformity of the air gap.

[0009] Another objective may be to provide a generator capable of effectively discharging heat generated from the stator during the operation of the generator. means of solving the problem

[0010] According to one aspect of the present disclosure for achieving the above or other purposes, a generator is provided comprising: a hollow rotor that is elongated and has a magnet, the rotor having a slot formed through the rotor in the longitudinal direction of the rotor and into which the magnet is inserted; a stator that surrounds the side of the rotor on the outside of the rotor and on which a coil is wound; a first end plate coupled to one side of the rotor and covering the slot; a second end plate coupled to the other side of the rotor and covering the slot; and a rotating shaft that provides rotational force, extends in the longitudinal direction of the rotor, and is coupled to the second end plate on the outside of the rotor. Effects of the invention

[0011] The effects of the generator according to the present disclosure are described as follows.

[0012] According to at least one embodiment of the present disclosure, a generator that can be made lighter by having a hollow rotor can be provided.

[0013] According to at least one embodiment of the present disclosure, a generator with increased ease of disassembly and assembly can be provided.

[0014] According to at least one embodiment of the present disclosure, a generator can be provided that can improve the vibration and noise characteristics of a rotor by increasing the concentricity of the rotor and the rotating shaft provided on the outer side of the rotor and improving the air gap uniformity.

[0015] According to at least one embodiment of the present disclosure, a generator capable of effectively providing heat generated from a stator during the operation of the generator can be provided.

[0016] Further scopes of the applicability of the present disclosure will become apparent from the following detailed description. However, since various changes and modifications within the spirit and scope of the present disclosure are clearly understood by those skilled in the art, specific embodiments, such as the detailed description and preferred embodiments of the present disclosure, should be understood as being given merely as examples. Brief explanation of the drawing

[0017] FIG. 1 is a perspective view of a generator according to an embodiment of the present disclosure. FIG. 2 is an exploded perspective view of a generator according to an embodiment of the present disclosure. FIGS. 3 and 4 are exploded perspective views of some components of a generator according to an embodiment of the present disclosure. FIG. 5 is a longitudinal cross-sectional view of a generator according to an embodiment of the present disclosure. FIG. 6 is a cutaway perspective view showing the internal configuration of a generator according to an embodiment of the present disclosure, and is a drawing for explaining an air passage for cooling the generator. Specific details for implementing the invention

[0018] Hereinafter, embodiments disclosed in this specification will be described in detail with reference to the attached drawings. Identical or similar components are given the same reference number regardless of the drawing symbols, and redundant descriptions thereof will be omitted.

[0019] The suffixes "module" and "part" used for components in the following description are assigned or used interchangeably solely for the ease of drafting the specification, and do not inherently possess distinct meanings or roles.

[0020] In addition, when describing the embodiments disclosed in this specification, if it is determined that a detailed description of related prior art may obscure the essence of the embodiments disclosed in this specification, such detailed description is omitted. Furthermore, the attached drawings are intended only to facilitate understanding of the embodiments disclosed in this specification, and the technical concept disclosed in this specification is not limited by the attached drawings; it should be understood that they include all modifications, equivalents, and substitutions that fall within the spirit and technical scope of the present invention.

[0021] Terms including ordinal numbers, such as first, second, etc., may be used to describe various components, but said components are not limited by said terms. These terms are used solely for the purpose of distinguishing one component from another.

[0022] When it is stated that one component is "connected" or "connected" to another component, it should be understood that while it may be directly connected or connected to that other component, there may also be other components in between. On the other hand, when it is stated that one component is "directly connected" or "directly connected" to another component, it should be understood that there are no other components in between.

[0023] A singular expression includes a plural expression unless the context clearly indicates otherwise.

[0024] In this application, terms such as “comprising” or “having” are intended to specify the existence of the features, numbers, steps, actions, components, parts, or combinations thereof described in the specification, and should be understood as not precluding the existence or addition of one or more other features, numbers, steps, actions, components, parts, or combinations thereof.

[0026] The generator of the present disclosure can receive mechanical energy from an external power source and convert it into electrical energy.

[0027] For example, the aforementioned external power source may be an engine. In this case, thermal energy generated by the combustion reaction of fuel and air in the engine can be converted into mechanical energy in the form of linear reciprocating motion of a piston. Furthermore, this reciprocating motion can be converted into rotational motion by a crankshaft connected to a connecting rod. At this time, although the reciprocating motion is discontinuous, the rotational motion of the crankshaft can be evenly distributed by a flywheel coupled perpendicularly to the crankshaft.

[0028] Accordingly, the generator can convert mechanical energy received through the crankshaft into electrical energy. At this time, the crankshaft may be referred to as the output shaft or rotation shaft of the engine. However, the external power source is not limited to the engine configured as described above, and various types of power sources may provide mechanical energy to the generator. Furthermore, the method of transmitting the mechanical energy of the engine to the generator is not limited to the power transmission means configured as described above, and various methods such as belt-pulley connections may be used.

[0030] Referring to FIGS. 1 and 2, the generator may be coupled to one side of the engine (200, not shown) via an engine bracket (240). The generator may include a rotor (110), a first end plate (141), a second end plate (142), a stator (120), a rotating shaft (210), a flywheel (220), and an engine bracket (240).

[0031] The rotor (110) may be located at the center of the generator. The rotor (110) may include a core (111) and a magnet (112). The core (111) may be formed in a cylindrical shape overall and may have one side and the other side open. A slot (111b) may be formed by penetrating one end and the other end of the core (111) in the longitudinal direction of the core (111), and a magnet (112) may be inserted therein. For example, the slot (111b) may include a plurality of slots (111b) spaced apart from each other in the circumferential direction of the core (111), and the magnet (112) may include a plurality of magnets (112), each of which is inserted into the plurality of slots (111b).

[0032] The first end plate (141) is detachably coupled to one end of the core (111) and can cover one side of the slot (111b). For example, the first end plate (141) can be coupled to one end of the core (111) by a fastening member, such as a screw, passing through a hole (141a) formed in the first end plate (141) and screwing into a fastening hole (111a) formed at one end of the core (111). The first end plate (141) is formed in a ring shape overall and may have an inner diameter equal to or similar to the inner diameter of the core (111) and an outer diameter equal to or similar to the outer diameter of the core (111).

[0033] The second end plate (142) is detachably coupled to the other end of the core (111) to cover the other side of the slot (111b). For example, the second end plate (142) can be coupled to the other end of the core (111) by a fastening member, such as a screw, passing through a hole (1421a) formed in the second end plate (142) and screwing into a fastening hole (not shown) formed at the other end of the core (111). The second end plate (142) is formed in the shape of a circular plate overall and may have an outer diameter equal to or similar to the outer diameter of the core (111).

[0034] Accordingly, the first end plate (141) and the second end plate (142) can prevent the magnet (112) inserted into the slot (111b) from coming out of the slot (111b). Meanwhile, the first end plate and the second end plate may be called stoppers.

[0035] The stator (120) may surround the side of the rotor (110) from the outside of the rotor (110). The inner surface of the stator (120) may be adjacent to the outer surface of the rotor (110). For example, the inner surface of the stator (120) may extend in a circular shape, and the outer surface of the stator (120) may be formed as an octagonal surface. A coil (C) may be wound on the stator (120).

[0036] The rotation shaft (210) may be an output shaft of an external power source (e.g., an engine) for a generator, or a shaft mechanically connected thereto. The rotation shaft (210) may be coupled to or fixed to the second end plate (142). In other words, the second end plate (142) may be coupled to or fixed to the rotor (110) and the rotation shaft (210) between the rotor (110) and the rotation shaft (210).

[0037] In this case, compared to the case where a rotating shaft is inserted into the interior of the rotor and fixed to the rotor, the internal space of the rotor (110) can be configured as hollow, so the weight of the rotor (110) can be significantly reduced. In addition, the disassembly and assembly of the rotor (110) are improved, and the length of the rotating shaft (210) can be significantly reduced, thereby reducing the manufacturing cost of the rotating shaft (210).

[0038] In addition, the second end plate (142) not only prevents the magnet (112) from coming off the aforementioned slot (111b), but is also directly connected to the rotating shaft (210) that transmits power from the engine (200), so it may be desirable to have a thickness greater than that of the first end plate (141) to ensure rigidity.

[0039] The flywheel (220) can be coupled to or fixed to the rotation axis (210). In other words, the rotation axis (210) can be coupled to or fixed to the second end plate (142) and the flywheel (220) between the second end plate (142) and the flywheel (220). The radial direction of the flywheel (220) can be orthogonal to the longitudinal direction of the rotation axis (210).

[0040] The engine bracket (240) may include a bracket body (241) and connectors (242). One side of the bracket body (241) may be open, and the other side may have a through hole (241a) formed through which a part of the rotation axis (210) passes. The connectors (242) may be provided on the inner wall of the bracket body (241). The aforementioned flywheel (220), etc., may be rotatably positioned in the internal space of the engine bracket (240). The stator (120) may be detachably coupled to the engine bracket (240) through the connectors (242).

[0041] Accordingly, when the engine (200) is driven, the rotor (110) rotates together with the rotating shaft (210), inducing current in the coil (C) wound on the stator (120), and the generator can produce power.

[0043] Referring to FIGS. 3 and 4, the second end plate (142) may include a first part (1421), a second part (1422), and a third part (1423). The first part (1421), the second part (1422), and the third part (1423) have the same center, and an axial hole (142a) may be formed passing through the center and penetrating the first part (1421), the second part (1422), and the third part (1423).

[0044] The first part (1421) forms the outer diameter of the second end plate (142) and can be formed in the shape of a disc overall. The aforementioned hole (1421a) can be formed by penetrating the first part (1421). The thickness of the first part (1421) can be t.

[0045] The second part (1422) may protrude from one side of the first part (1421) toward the core (111) by a first length (l1). The second part (1422) is formed in a disc shape, and the diameter of the second part (1422) may be smaller than the diameter of the first part (1421) and equal to the inner diameter of the core (111). Suction holes (1422a) are formed through the second part (1422) and may be arranged radially with respect to the axial hole (142a). The suction holes (1422a) are in communication with the internal space of the core (111), and air may flow into the suction holes (1422a) through the internal space of the core (111). Coupling holes (1423a) are formed through the second part (1422) and may be arranged radially with respect to the axial hole (142a). The coupling holes (1423a) can be positioned between the axial hole (142a) and the suction holes (1422a) in the radial direction of the second part (1422).

[0046] The third part (1423) is recessed by a third length (l3) toward the core (111) from the other side of the first part (1421) and may face the rotation axis (210). The aforementioned suction holes (1422a) may be arranged radially with respect to the third part (1423). The aforementioned coupling holes (1423a) may penetrate the third part (1423).

[0047] The rotation axis (210) may include a flange (211), a body (212), a head (213), and a boss (214). The flange (211), body (212), head (213), and boss (214) may have the same center.

[0048] The flange (211) can be formed in the shape of a disc overall. A hole (211a) is formed through the flange (211), and a fastening member such as a screw can pass through the hole (211a) and be fastened to one side of the flywheel (220).

[0049] The body (212) may protrude from one side of the flange (211) toward the second end plate (142). The body (212) is formed in a cylindrical shape overall, and the diameter of the body (212) may be smaller than the diameter of the flange (211). Coupling holes (212a) are formed on one side of the body (212), and a fastening member such as a screw may pass through the coupling holes (1422a) of the second part (1422) and be fastened to the coupling holes (212a) of the body (212).

[0050] The head (213) may protrude from one side of the body (212) toward the second end plate (142) by a second length (l2). The head (213) is formed in the shape of a short pipe or cylinder, and the diameter of the head (213) may be smaller than the diameter of the body (212). One side of the head (213) is open so that the internal space of the head (213) may communicate with the shaft hole (142a).

[0051] The boss (214) protrudes from the other side of the flange (211) toward the flywheel (220) and can pass through the hole (220a) formed in the center of the flywheel (220). That is, the boss (214) can be connected to the engine (200) through the hole (220a) and the through hole (241a, FIG. 2) of the engine bracket.

[0053] Referring to FIG. 5, when the second end plate (142) is coupled to the other side of the rotor (110), the second part (1422) can be inserted into the internal space (110S) of the rotor (110) and come into contact with the inner surface of the rotor (110). At this time, the diameter of the second part (1422) may be the same as the inner diameter of the rotor (110).

[0054] In this case, in the radial direction of the rotor (110), the second part (1422) can form an overlapping portion of a first length (l1) that overlaps or engages with the rotor (110).

[0055] When the rotation axis (210) is coupled to the other side of the second end plate (142), the body (212) is seated on the third part (1423), and the head (213) can be inserted into the shaft hole (142a, see FIG. 3 and 4). At this time, the diameter of the body (212) may be the same as the diameter of the third part (1423), and the diameter of the head (213) may be the same as the diameter of the shaft hole (142a).

[0056] In this case, in the radial direction of the second end plate (142), the body (212) may form an overlapping portion of a third length (l3) that overlaps or engages with the first part (1421) formed stepwise on the third part (1423). Also, in the radial direction of the second end plate (142), the head (213) may form an overlapping portion of a second length (l2) that overlaps or engages with the third part (1423) forming the shaft hole (142a).

[0057] Accordingly, the bonding force of the second end plate (142) to the rotor (110) can be made more robust, and the bonding of the second end plate (142) to the rotor (110) can be made easier. Also, the bonding force of the rotation axis (210) to the second end plate (142) can be made more robust, and the bonding of the rotation axis (210) to the second end plate (142) can be made easier. Furthermore, the concentricity of the rotor (110), the second end plate (142), and the rotation axis (210) can be increased, and the uniformity of the air gap can be improved. Moreover, cooling performance can be improved by the surface contact of the rotation axis (210) to the second end plate (142).

[0059] Referring to FIGS. 2 and 6, the stator (120) may include a coil slot (120a) adjacent to the inner circumference of the stator (120) where a coil (C) is wound, and a yoke (121, 122) forming the outer circumference of the stator (120).

[0060] The yoke (121, 122) may include a first yoke (121) and a second yoke (122). A coupling hole (121a) is formed by penetrating the first yoke (121), and the second yoke (122) may be a portion of the yoke (121, 122) excluding the first yoke (121).

[0061] The connector (242) may face the first yoke (121). A coupling hole (242a) may be formed by penetrating the connector (242) along the longitudinal direction of the rotation axis (210). In this case, a fastening member such as a long bolt or screw may pass through the coupling hole (121a) of the first yoke (121) and be fastened to the coupling hole (242a) of the connector (242).

[0062] Accordingly, a generator equipped with a stator (120) can be coupled to the engine side without a separate support, thereby saving the cost and time required to manufacture the support separately and preventing damage to the stator (120) caused during the process of installing the support on the stator (120).

[0063] Meanwhile, the blade (230) may be attached to or fixed to one side of the flywheel (220). When the rotation axis (210) rotates, the flywheel (220) and the blade (230) may rotate around the rotation axis (210).

[0064] When the blade (230) rotates, air introduced into the flywheel (220) through the intake holes (1422a) can flow radially in the flywheel (220). The blade (230) can be bent at least once. The blade (230) of the blade (230) may include a plurality of blades (230) spaced apart from each other in the circumferential direction of the flywheel (220).

[0065] At least a portion of the air flowing through the blade (230) may be introduced into the inlet (242b) of the connector (242) and supplied to the stator (120) through the discharge port (242c). The inlet (242b) may be formed by penetrating the connector (242) in the radial direction of the flywheel (220). The discharge port (242c) may be formed by penetrating the connector (242) in the longitudinal direction of the rotation axis (210) and may be in communication with the inlet (242b).

[0066] Meanwhile, the remainder of the air flowing through the blade (230) can be supplied to the stator (120) through the inner wall of the bracket body (241) extending toward the stator (120) from the other side of the engine bracket (240).

[0067] The cooling channel (121b) is formed by penetrating the first yoke (121) along the longitudinal direction of the rotation axis (210) and can be in communication with the discharge port (242c). That is, air discharged from the discharge port (242c) in response to the rotation of the blade (230) can flow through the cooling channel (121b). In this way, heat generated in the stator (120) or coil (C) during the operation of the generator can be effectively removed.

[0068] The fins (122a) may protrude outward from the surface of the second yoke (122). The fins (122a) may extend lengthwise along the axis of rotation (210) and be spaced apart from each other around the second yoke (122) to form an air passage. That is, in response to the rotation of the blade (230), air may flow along the inner wall of the bracket body (241) toward the fins (122a). Thus, heat generated in the stator (120) or coil (C) during the operation of the generator can be effectively removed.

[0069] Meanwhile, at least a portion of the outer surface of the first yoke (121) may contact the inner surface of the bracket body (241), and at least a portion of the outer surface of each of the pins (122a) may contact the inner surface of the bracket body (241). That is, by inserting a portion of the stator (120) into the engine bracket (240), an overlapping portion (OA) can be formed.

[0070] Accordingly, air blown radially by the flywheel (220) according to the rotation of the blade (230) can be guided to the cooling passage (121b) and fins (122a) without leakage to the outside. Additionally, since an overlap portion (OA) is formed on one side of the connector (242), the connection of the stator (120) to the engine bracket (240) through the connector (242) can be easily guided.

[0072] According to one aspect of the present disclosure, a generator is provided comprising: a hollow rotor that is elongated and has a magnet, the rotor having a slot formed through the rotor in the longitudinal direction of the rotor and into which the magnet is inserted; a stator that surrounds the side of the rotor on the outside of the rotor and on which a coil is wound; a first end plate coupled to one side of the rotor and covering the slot; a second end plate coupled to the other side of the rotor and covering the slot; and a rotating shaft that provides rotational force, extends in the longitudinal direction of the rotor, and is coupled to the second end plate on the outside of the rotor.

[0073] According to another aspect of the present disclosure, the first end plate is formed in a ring shape and the second end plate is formed in a disc shape, and the thickness of the second end plate may be greater than the thickness of the first end plate.

[0074] According to another aspect of the present disclosure, the second end plate comprises: a first part coupled to the other side of the rotor; and a second part protruding toward the rotor from one side of the first part, wherein the diameter of the second part is smaller than the diameter of the first part but equal to the inner diameter of the rotor, and the side of the second part may contact the inner surface of the rotor.

[0075] According to another aspect of the present disclosure, the second end plate further comprises: a third part that is recessed toward the rotor from the other side of the first part, and the third part may face the axis of rotation and be in surface contact with the axis of rotation.

[0076] According to another aspect of the present disclosure, the rotation axis further comprises a body extending in the longitudinal direction of the rotation axis and seated on the third part, wherein the diameter of the body is the same as the diameter of the third part, and a portion of the side of the body may contact the first part formed with a step from the third part.

[0077] According to another aspect of the present disclosure, the first part, the second part, and the third part have the same center, and the second end plate may further include an axial hole formed through the center and penetrating the first part, the second part, and the third part.

[0078] According to another aspect of the present disclosure, the rotation axis further comprises: a head protruding toward the shaft hole from one side of the body, the diameter of the head being equal to the diameter of the shaft hole, and the side of the head being able to contact the third part forming the shaft hole.

[0079] According to another aspect of the present disclosure, the rotating shaft further comprises a flywheel to which the rotating shaft is fixed, and the rotating shaft may further comprise a boss protruding from the rotating shaft toward the flywheel and penetrating the flywheel.

[0080] According to another aspect of the present disclosure, a blade coupled to one side of the flywheel is further included, and the second end plate further includes an intake hole formed through the second end plate in the longitudinal direction of the rotation axis and communicating with the internal space of the rotor to provide air to the blade, and the blade can discharge air in the radial direction of the flywheel.

[0081] According to another aspect of the present disclosure, the engine bracket further comprises an internal space in which the flywheel is housed and air discharged from the blade flows, and the stator may form a passage in which the air flows in communication with the internal space of the engine bracket.

[0083] Some or other embodiments of the present disclosure described above are not exclusive or distinct from one another. Some or other embodiments of the present disclosure described above may be used in combination or combined for their respective configurations or functions.

[0084] For example, this means that configuration A described in a specific embodiment and / or drawing and configuration B described in another embodiment and / or drawing can be combined. That is, it means that even if the combination between configurations is not directly described, combination is possible except in cases where it is described that combination is impossible.

[0085] The foregoing detailed description should not be interpreted restrictively in all respects and should be considered exemplary. The scope of the invention shall be determined by a reasonable interpretation of the appended claims, and all modifications within the equivalent scope of the invention are included within the scope of the invention.

Claims

Claim 1 A generator comprising: a hollow rotor having a magnet, wherein the rotor has a slot formed penetrating the rotor in the longitudinal direction of the rotor and into which the magnet is inserted; a stator surrounding the side of the rotor on the outside of the rotor and having a coil wound thereon; a first end plate coupled to one side of the rotor and covering the slot; a second end plate coupled to the other side of the rotor and covering the slot; and a rotation axis that provides rotational force, extends in the longitudinal direction of the rotor, and is coupled to the second end plate on the outside of the rotor, wherein the second end plate comprises: a first part coupled to the other side of the rotor; and a second part protruding toward the rotor from one side of the first part, wherein the diameter of the second part is smaller than the diameter of the first part but equal to the inner diameter of the rotor, and the side of the second part contacts the inner surface of the rotor. Claim 2 A generator according to claim 1, wherein the first end plate is formed in a ring shape and the second end plate is formed in a disc shape, and the thickness of the second end plate is greater than the thickness of the first end plate. Claim 3 delete Claim 4 In claim 1, the second end plate further comprises: a third part that is recessed toward the rotor from the other side of the first part, and the third part faces the rotation axis and is in surface contact with the rotation axis. Claim 5 In claim 4, the rotational shaft further comprises: a body extending in the longitudinal direction of the rotational shaft and seated on the third part, wherein the diameter of the body is the same as the diameter of the third part, and a portion of the side of the body contacts the first part which is formed with a step difference from the third part. Claim 6 In claim 5, the first part, the second part, and the third part have the same center, and the second end plate further comprises an axial hole formed through the center and penetrating the first part, the second part, and the third part. Claim 7 In claim 6, the rotational shaft further comprises: a head protruding toward the shaft hole from one side of the body, the diameter of the head being equal to the diameter of the shaft hole, and the side of the head contacting the third part forming the shaft hole. Claim 8 A generator according to claim 1, further comprising a flywheel to which the rotation axis is fixed, wherein the rotation axis further comprises: a boss protruding from the rotation axis toward the flywheel and penetrating the flywheel. Claim 9 A generator comprising: a hollow rotor having a magnet, wherein the rotor has a slot formed penetrating the rotor in the longitudinal direction of the rotor and into which the magnet is inserted; a stator surrounding the side of the rotor on the outside of the rotor and having a coil wound thereon; a first end plate coupled to one side of the rotor and covering the slot; a second end plate coupled to the other side of the rotor and covering the slot; a rotation shaft providing rotational force, extending in the longitudinal direction of the rotor and coupled to the second end plate on the outside of the rotor; a flywheel to which the rotation shaft is fixed; and a blade coupled to one side of the flywheel, wherein the second end plate includes an intake hole formed penetrating the second end plate in the longitudinal direction of the rotation shaft and communicating with the internal space of the rotor to provide air to the blade, and the blade discharges air in the radial direction of the flywheel. Claim 10 In claim 9, the generator further comprises an engine bracket having an internal space in which the flywheel is housed and air discharged from the blade flows, and the stator forms a passage in which the stator communicates with the internal space of the engine bracket.

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