Hull direct connection type propulsion device for reciprocal rotation propeller and manufacturing method of the same

Abstract

To provide a hull direct connection type propulsion device for a reciprocal rotation propeller greatly improving propulsion efficiency of an electric propulsion vessel by being composed so that the reciprocal rotation propeller loaded on the electric propulsion vessel is directly coupled to a hull, and a manufacturing method of the same.SOLUTION: A hull direct coupling propulsion device includes: a relative rotation propeller composed of a front propeller and a rear propeller; a double rotor electric motor generating respective rotational directions in a front propeller and a rear propeller; and a double shaft coupling the relative rotation propeller and the double rotor electric motor.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a hull-direct-mounted propulsion device with counter-rotating propellers and a manufacturing method thereof. More specifically, the present invention relates to a hull-direct-mounted propulsion device with counter-rotating propellers mounted on an electric propulsion vessel that is configured to be directly connected to the hull, thereby significantly improving the propulsion efficiency of the vessel, and a manufacturing method thereof that eliminates a gearbox for realizing the counter-rotation of the counter-rotating propellers, thereby enabling the interior space of the vessel to be used for other purposes and reducing energy loss. [Background technology]

[0002] Contra-rotating propellers are two propellers arranged on the same axis that rotate in opposite directions to generate thrust, and are primarily used in ships and aircraft.

[0003] These contra-rotating propellers have two propellers that rotate in different directions, and the rotational turbulence generated when each propeller rotates naturally cancels out and reduces through interaction.

[0004] Therefore, contra-rotating propellers generate higher thrust than single propellers, which use one propeller to generate thrust, and have the advantage of being superior in straightness, which greatly improves propulsion efficiency and significantly reduces vibrations caused by rotational turbulence.

[0005] Typically, a marine propulsion device using contra-rotating propellers comprises an inner shaft connected to an internal power source of the hull, a rear propeller attached to the rear end of the inner shaft, a hollow outer shaft installed to rotate on the outer surface of the inner shaft, and a front propeller attached to the rear end of the outer shaft.

[0006] In this case, a contra-rotating gear box is used as a means for rotating the front propeller in the direction opposite to the rotation direction of the rear propeller.

[0007] In conventional engine-propelled vessels, due to restrictions on the rotation direction of the engine, a gearbox has been used to realize the counter-rotating rotation of the contra-rotating propellers.

[0008] However, the gearbox acts as a factor in energy loss by rotating the two propellers in opposite directions, which increases energy loss and reduces the propulsion efficiency of the contra-rotating propeller type propeller.

[0009] To solve this problem, a prior art has been disclosed for a contra-rotating propeller type propeller driven by a superconducting motor without a gear device, which has a structure that relatively improves propulsion efficiency and reduces energy loss compared to a conventional structure that drives a normal conducting motor and a gear device by driving the contra-rotating propeller type propeller by one or more electric motors without a gear device.

[0010] However, the above-mentioned prior art is a counter-rotating propulsion system using a superconducting motor, and in order for the superconducting motor to operate, a cooling device must be included to supply a cryogenic refrigerant to cool the superconducting coil. This increases energy loss in the electric propulsion vessel and complicates maintenance.

[0011] Therefore, there is an urgent need for research and development into an electric propulsion vessel in which counter-rotating propellers can be directly connected to the hull to increase the propulsion efficiency of the vessel, and a gearbox and its associated lubrication system can be eliminated, thereby realizing a double rotor within the electric motor and driving the propellers of the counter-rotating propellers to rotate in opposite directions through a double-shaft configuration that eliminates the gearbox. [Prior art documents] [Patent documents]

[0012] [Patent Document 1] Republic of Korea Patent Registration No. 10-1380650 [Patent Document 2] Republic of Korea Registered Patent Publication No. 10-1606242 [Patent Document 3] Republic of Korea Patent Publication No. 10-2014-0025004 [Patent Document 4] Japanese Patent Application Publication No. 2022-000359 Summary of the Invention [Problem to be solved by the invention]

[0013] In order to solve the above-mentioned problems, an object of the present invention is to provide a hull-directly coupled propulsion device for counter-rotating propulsors, which is mounted on an electric propulsion vessel and can be directly coupled to the hull, thereby significantly improving the propulsion efficiency of the electric propulsion vessel, and a manufacturing method thereof.

[0014] Another object of the present invention is to provide a hull-mounted propulsion device with counter-rotating propulsors and a manufacturing method thereof, which allows the interior space of a ship to be utilized for other purposes through a double shaft structure that embodies dual rotors within an electric motor and eliminates the need for a gearbox, thereby reducing energy loss and facilitating maintenance. [Means for solving the problem]

[0015] In order to achieve the above object, the counter-rotating propeller direct-coupled propulsion device of the present invention is characterized by including: a counter-rotating propeller composed of a front propeller and a rear propeller; a dual rotor motor that generates rotation directions for the front propeller and the rear propeller; and a dual shaft that connects the counter-rotating propeller and the dual rotor motor.

[0016] In addition, in the counter-rotating propulsion device directly coupled to the hull according to the present invention, the counter-rotating propulsion units are connected to the ends of the dual shafts located at the end of the stern of the hull and are disposed outside the stern.

[0017] In addition, in the counter-rotating propeller hull direct-mounted propulsion device according to the present invention, the counter-rotating propeller is characterized in that the front propeller and the rear propeller are disposed on the dual shaft and rotate in different directions.

[0018] In addition, in the counter-rotating propulsion device directly coupled to a ship's hull, the double rotor motor has a rotor and a stator, each pair of which is operated by induction power, arranged in sequence to rotate the counter-rotating propulsion device.

[0019] In addition, in the reciprocating propulsion device directly coupled to a hull according to the present invention, the rotor is disposed outside the double rotor motor and includes an outer rotor that rotates in one direction, and an inner rotor that rotates in a direction opposite to the rotation direction of the outer rotor.

[0020] In the reciprocating propulsion device directly coupled to a ship body according to the present invention, the rotors may include permanent magnets or rotor cores in the outer rotor and the inner rotor.

[0021] In the counter-rotating propulsion device directly coupled to a ship according to the present invention, the stator includes an external coil that controls the external rotor and an internal coil that controls the internal rotor.

[0022] In addition, in the counter-rotating propulsion device for a ship's hull directly coupled propulsion system according to the present invention, when the external coil and the internal coil are used simultaneously, the device is configured with one stator, and when the external coil and the internal coil are used separately, the device is configured with multiple stators.

[0023] In addition, in the counter-rotating propulsion device directly coupled to the hull of the present invention, the double shaft is connected to the end of the double rotor motor, and one side rotates in one direction and the other side rotates in the opposite direction to the one side.

[0024] In addition, in the counter-rotating propulsion device directly coupled to the hull of the present invention, the double shaft is connected to the end of the double rotor motor and includes an outer shaft and an inner shaft that rotate in opposite directions.

[0025] In addition, in the counter-rotating propulsion device directly coupled to a hull according to the present invention, the double shaft is characterized in that bearings supporting the outer shaft and the inner shaft are disposed on one side where the outer shaft intersects with the hull.

[0026] Meanwhile, to achieve the above object, a method for manufacturing a hull-mounted propulsion device with counter-rotating propellers according to the present invention includes the steps of: (a) disposing a dual-rotor motor inside the hull that generates rotation directions for the front and rear propellers of the counter-rotating propellers; (b) disposing a dual shaft connected to the ends of the dual-rotor motor inside the hull; and (c) disposing the counter-rotating propellers connected to the ends of the dual shafts outside the stern of the hull.

[0027] In addition, in the method for manufacturing a hull-mounted propulsion device with counter-rotating propulsors according to the present invention, step (a) is characterized in that a pair of rotors and stators operated by induction power are sequentially arranged in the double rotor motor.

[0028] Other specific details of the embodiments are included in the "Description of the Invention" and the accompanying "Drawings".

[0029] The advantages and / or features of the present invention and the manner in which they are achieved will become more apparent with reference to the various embodiments described in detail below in conjunction with the accompanying drawings.

[0030] However, the present invention is not limited to the configurations of the embodiments disclosed below, and may be embodied in various different forms. However, the embodiments disclosed in this specification are provided to complete the disclosure of the present invention and to fully convey the scope of the present invention to those skilled in the art, and it should be understood that the present invention is defined only by the scope of the claims. [Effects of the Invention]

[0031] According to the present invention, the counter-rotating propeller is configured as a direct-coupled type to the hull, which has the effect of increasing the propulsion efficiency of the ship, and the dual shaft configuration without the gearbox allows the interior space of the ship to be used for other purposes, reduces energy loss, and simplifies maintenance. [Brief explanation of the drawings]

[0032] [Figure 1] 1 is a cross-sectional view showing a state in which a propulsion device according to an embodiment of the present invention is applied to a ship; [Figure 2] 1 is a conceptual diagram illustrating the concept of a propulsion device according to an embodiment of the present invention. [Figure 3] 1 is a diagram showing the configuration of a double rotor motor according to an embodiment of the present invention; [Figure 4] FIG. 1 is a conceptual diagram illustrating a dual axis concept according to an embodiment of the present invention. [Figure 5] 4 is a flow chart illustrating a method of manufacturing a propulsion device according to an embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0033] Before describing the present invention in detail, it should be understood that the terms and words used in this specification should not be interpreted unconditionally and limited to their ordinary or dictionary meanings, but that the inventors of the present invention may appropriately define and use the concepts of various terms in order to explain their invention in the best possible way, and further, that these terms and words should be interpreted in a meaning and concept that is consistent with the technical idea of ​​the present invention.

[0034] In other words, the terms used in this specification are used only to describe preferred embodiments of the present invention, and are not intended to specifically limit the content of the present invention. It should be understood that these terms are defined in consideration of various possibilities of the present invention.

[0035] Furthermore, unless the context clearly indicates otherwise, singular expressions in this specification may also include plural expressions, and similarly, even when plural expressions are used, they must be understood to include the singular meaning.

[0036] Throughout this specification, when a component is described as "comprising" another component, it does not mean that it excludes any other component, but that it may further include any other component, unless specifically stated to the contrary.

[0037] Furthermore, when a component is described as being "located within or connected to" another component, it should be understood that this component may be directly connected to or in contact with the other component, or may be spaced apart at a certain distance. In the case where the component is spaced apart at a certain distance, a third component or means may be present to secure or connect the component to the other component, and the description of this third component or means may be omitted.

[0038] On the other hand, when a component is described as being "directly coupled" or "directly connected" to another component, it should be understood that no third component or means is present.

[0039] Similarly, other expressions explaining the relationship between components, such as "between" and "immediately between," or "adjacent to" and "directly adjacent to," should be construed as having the same meaning.

[0040] Furthermore, terms such as "one side," "other side," "one side," "other side," "first," and "second," if used in this specification, are used to clearly distinguish one component from other components, and it should be understood that these terms are not used to limit the meaning of the components.

[0041] Additionally, terms relating to position, such as "upper," "lower," "left," and "right," when used herein, should be understood to indicate relative positions in the drawings for the components, and should not be understood as referring to absolute positions unless absolute positions are specified for these positions.

[0042] Furthermore, in this specification, when assigning a reference number to each component in each drawing, the same component will have the same reference number even if the component appears in another drawing, i.e., the same reference number throughout the specification indicates the same component.

[0043] In the accompanying drawings in this specification, the size, position, connection relationship, etc. of each component constituting the present invention may be partially exaggerated, reduced, or omitted in order to convey the concept of the present invention clearly enough or for the convenience of explanation, and therefore the proportions and scales may not be exact.

[0044] In addition, in the following description of the present invention, detailed description of configurations that are deemed to obscure the gist of the present invention, such as publicly known technologies including conventional technologies, may be omitted.

[0045] Hereinafter, embodiments of the present invention will be described in detail with reference to the associated drawings.

[0046] FIG. 1 is a cross-sectional view showing a state in which a propulsion device according to an embodiment of the present invention is applied to a ship, and FIG. 2 is a conceptual diagram showing the concept of the propulsion device according to the embodiment of the present invention.

[0047] Referring to FIGS. 1 and 2, a hull-mounted propulsion system with counter-rotating propellers according to an embodiment of the present invention may include a counter-rotating propeller 100, a dual rotor motor 200, and a dual shaft 300.

[0048] The counter-rotating propeller direct-coupled propulsion device according to one embodiment of the present invention provides a device that can increase the propulsion efficiency of the hull 10 by arranging the counter-rotating propeller 100 at the outer end of the stern of the hull 10.

[0049] Specifically, as shown in FIGS. 1 and 2, the counter-rotating propeller 100 according to one embodiment of the present invention may be a device that includes a front propeller 110 and a rear propeller 120, the front propeller 110 and the rear propeller 120 being arranged side by side on a double shaft 300 located at the outer end of the stern of the hull 10, and rotating in different directions (e.g., clockwise and counterclockwise).

[0050] The counter-rotating propeller 100 according to one embodiment of the present invention is connected to one side of the double shaft 300 connected to the double rotor motor 200 and the other side of the double shaft 300 located in the opposite direction. The operation of the double rotor motor 200 is transmitted to the counter-rotating propeller 100 via the double shaft 300, so that the front propeller 110 and the rear propeller 120 included in the counter-rotating propeller 100 can rotate in different directions.

[0051] Specifically, the front propeller 110 of the counter-rotating propeller 100 may be connected to the outer shaft 310 of the dual shaft 300 connected to the dual rotor motor 200 located inside the hull, and the rear propeller 120 of the counter-rotating propeller 100 may be connected to the inner shaft 320 of the dual shaft 300 connected to the dual rotor motor 200.

[0052] Here, the rotational motion generated by the dual rotor motor 200 is transmitted to the counter-rotating propeller 100, so that the front propeller 110 and the rear propeller 120 can rotate in different directions.

[0053] However, without being limited thereto, the counter-rotating propeller 100 may also refer to a device in which the front propeller 110 and the rear propeller 120 are connected to the outer shaft 310 and the inner shaft 320 of the double shaft 300, respectively.

[0054] Meanwhile, due to the operation of the counter-rotating propellers 100, which rotate in opposite directions, the wake flow discharged from the front propeller 110 increases the angle of attack that occurs on the cross section of the rear propeller 120, reducing the flow velocity component in the rotational direction and improving the lift-to-drag ratio of the cross section of the rear propeller 120.

[0055] Conversely, in the counter-rotating propeller 100 according to one embodiment of the present invention, the rear propeller 120 sucks in the wake and rectifies the wake disturbances generated by the rear blade of the front propeller 110, thereby improving the lift-to-drag ratio of the cross section of the front propeller 110.

[0056] Here, the lift-to-drag ratio may refer to the ratio of the air or water resistance generated when the moving body moves forward to the air or water resistance generated when the moving body moves in the opposite direction.

[0057] The counter-rotating propeller 100 according to an embodiment of the present invention is directly connected to the stern boss of the hull, improving the lift-to-drag ratio and thereby increasing the propulsion efficiency of the ship.

[0058] Also, as shown in FIGS. 1 and 2, the counter-rotating propeller 100 according to an embodiment of the present invention may be connected to the end of a dual shaft 300 located at the end of the stern of the hull 10 and disposed outside the stern of the hull 10.

[0059] Specifically, the counter-rotating propeller 100 according to an embodiment of the present invention may be directly connected to a streamlined portion (e.g., a stern boss) protruding rearward from the hull 10 to support the dual shaft 300.

[0060] The counter-rotating propeller 100 according to an embodiment of the present invention is connected to the end of the double shaft 300 located at the stern boss of the hull 10, and is directly connected to the stern boss, which reduces disturbance of the inflow flow caused by other structures of the hull (e.g., housing and struts), and the flow passing through the hull flows directly into the counter-rotating propeller 100.

[0061] Therefore, the counter-rotating propeller hull-mounted propulsion device 1000 according to one embodiment of the present invention reduces the influence of other structures on the hull (e.g., disturbance of the inflow flow), and the front propeller 110 and the rear propeller 120 can be designed to match the direction of the inflow flow, thereby increasing the propulsion efficiency of the counter-rotating propeller 100.

[0062] FIG. 3 is a diagram showing the configuration of a double rotor motor according to an embodiment of the present invention.

[0063] Referring to FIG. 3, a counter-rotating propulsion device directly coupled to a ship according to an embodiment of the present invention may include a dual rotor motor 200 including a rotor 210 and a stator 220 .

[0064] Here, the rotor 210 rotates due to the current generated by the magnetic field in the stator 220, generating mechanical rotational power, and the stator 220 may refer to a device that generates a magnetic field when current flows through a coil.

[0065] Meanwhile, the double rotor motor 200 according to an embodiment of the present invention has a rotor 210 and a stator 220 arranged in pairs, and can rotate the counter-rotating propeller 100 .

[0066] Specifically, the dual rotor motor 200 is connected to one side of the dual shaft 300, and generates power through the operation of the rotor 210 and the stator 220. The generated rotational power is transmitted to the counter-rotating propeller 100 via the dual shaft 300, and the dual rotor motor 200 can rotate the front propeller 110 and the rear propeller 120 included in the counter-rotating propeller 100 connected to the other side of the dual shaft 300.

[0067] Additionally, the dual rotor motor 200 can be an induction motor using inductive power or a permanent magnet.

[0068] Preferably, the double rotor motor 200 according to an embodiment of the present invention may be an induction motor that operates a pair of rotors 210 and stators 220 arranged sequentially using induction power.

[0069] A rotor 210 according to one embodiment of the present invention may be configured to include an outer rotor 212 and an inner rotor 214 .

[0070] Specifically, the external rotor 212 is disposed outside the double-rotor motor 200 and can be rotated in one direction by the stator 220 that is paired with the external rotor 212 .

[0071] Similarly, the inner rotor 214 is disposed inside the dual rotor motor 200 and can be rotated in the opposite direction to the outer rotor 214 by a stator 220 that is paired with the inner rotor 214 .

[0072] Here, the rotation directions of the outer rotor 212 and the inner rotor 214 may be the same as the rotation directions of the front propeller 110 and the rear propeller 120 of the counter-rotating propeller 100 .

[0073] Furthermore, the outer rotor 212 and the inner rotor 214 according to an embodiment of the present invention may each include a permanent magnet or an armature core.

[0074] Meanwhile, the stator 220 according to an embodiment of the present invention may be configured to include an outer coil 222 and an inner coil 224 .

[0075] Here, the outer coil 222 can control the rotation of the outer rotor 212 and the inner coil 224 can control the rotation of the inner rotor 214 .

[0076] Specifically, the rotation of the external rotor 212 can be controlled by an external coil 222 of a stator 220 that is paired with the external rotor 212 .

[0077] Similarly, the rotational movement of the internal rotor 214 can be controlled by the internal coils 224 of the stator 220 that are paired with the internal rotor 214 .

[0078] Furthermore, the stator 220 according to one embodiment of the present invention may be configured as one stator 220 when the external coil 222 and the internal coil 224 are used simultaneously, or may be configured as multiple stators when the external coil 222 and the internal coil 224 are used separately.

[0079] For example, when the external coil 222 and the internal coil 224 are used simultaneously, the rotational movement of the external rotor 212 and the internal rotor 214 can be controlled by controlling only the direction of the current flowing through the external coil 222 and the internal coil 224, so the external rotor 212 and the internal rotor 214 may be configured with a single stator 220.

[0080] On the other hand, when an external coil 222 and an internal coil 224 are used, the stator 220 may be composed of multiple stators 220 because consideration must be given not only to the direction of the current flowing through the external coil 222 and the internal coil 224, but also to the insulation between the external coil 222 and the internal coil 224 and the fastening of the bearings.

[0081] In addition, the dual rotor motor 200 according to an embodiment of the present invention has a rotor 210 and a stator 220 that operate using induction power, arranged in pairs, and the distance between the rotor 210 and the stator 220, the number of magnets included in the dual rotor motor 200, and the number of coils are changeable.

[0082] In other words, the dual rotor motor 200 has a structure in which the coils are arranged sequentially, which has the effect of being able to continuously control the outer shaft 310 and inner shaft 320 of the dual shaft 300 connected to the dual rotor motor 200 simply by controlling the current and voltage.

[0083] These dual rotor motor 200 configurations increase the control flexibility of the propulsion device 1000, simplify maintenance, and reduce energy loss due to increased propulsion efficiency, even when the electric propulsion vessel is exposed to complex marine environments.

[0084] FIG. 4 is a conceptual diagram illustrating a dual axis concept according to an embodiment of the present invention.

[0085] Referring to FIG. 4, a double shaft 300 of a ship-mounted propulsion system with counter-rotating propellers according to an embodiment of the present invention may include an outer shaft 310 and an inner shaft 320.

[0086] In the dual shaft 300 according to one embodiment of the present invention, the outer shaft 310 and the inner shaft 320 are connected to the outer rotor 212 and the inner rotor 214 of the dual rotor motor 200, respectively, and can rotate in opposite directions by the rotational power generated from the dual rotor motor 200.

[0087] In addition, in the double shaft 300 according to an embodiment of the present invention, bearings for supporting the outer shaft 310 and the inner shaft 320 may be disposed on one side where the outer shaft 310 and the hull 10 intersect.

[0088] Specifically, the outer shaft 310 and the inner shaft 320 according to an embodiment of the present invention are connected to bearings connected to the dual rotor motor 200, so that the rotational power generated by the operation of the dual rotor motor 200 can be transmitted to the counter-rotation propeller 100.

[0089] In the embodiments of the present invention, for ease of explanation, the device or part that connects the outer shaft 310 and the inner shaft 320 is described as a bearing, but this is not limited to this, and any device or part made of metal that connects and separates the outer shaft 310 and the inner shaft 320 can be used.

[0090] Here, if the dual shaft 300 is not provided with bearings that connect or support the outer shaft 310 and the inner shaft 320, the N pole and S pole will continue to change as the dual rotor motor 200 rotates, and noise (e.g., magnetic field interference) generated by the dual rotor motor 200 may cause the internal rotor 214 that rotates the inner shaft 320 to rotate in a void.

[0091] However, the counter-rotating propulsion device 1000 directly coupled to the hull according to one embodiment of the present invention includes bearings that connect or support the outer shaft 310 and the inner shaft 320, thereby reducing noise between the dual rotor motor 200 and the dual shaft 300.

[0092] In other words, the dual shaft 300 of the embodiment of the present invention may be a device that runs from the dual rotor motor 200 located inside the hull 10 to the stern boss of the hull 10, connecting the dual rotor motor 200 and the counter-rotating propeller 100.

[0093] In addition, the dual shaft 300 according to one embodiment of the present invention may be configured to realize the dual rotors of the dual rotor motor 200, thereby replacing the gearbox installed to realize the counter-rotation, and to enable the counter-rotation operation of the propellers of the counter-rotation propeller 100.

[0094] Therefore, in the counter-rotating propulsion device 1000 directly coupled to the hull according to one embodiment of the present invention, the double shaft 300 replaces the role of the gearbox, thereby eliminating the gearbox and the associated lubrication system, and enabling the implementation of a shaft with a simpler form than that of a ship equipped with a gearbox.

[0095] As a result, the reciprocating propulsion device 1000 directly coupled to the hull according to one embodiment of the present invention has the advantage of increasing the control flexibility of the hull propulsion device and facilitating maintenance even when the electric propulsion vessel is subject to the complex marine environment.

[0096] FIG. 5 is a flow chart illustrating a method for manufacturing a propulsion device according to an embodiment of the present invention.

[0097] Referring to FIG. 5, a method for manufacturing a propulsion device according to an embodiment of the present invention may include the steps of: placing a dual rotor motor 200, which generates rotation directions for the front propeller 110 and the rear propeller 120 of the counter-rotating propeller 100, inside the hull 10 (S100); placing a dual shaft 300 connected to an end of the dual rotor motor 200 inside the hull 10 (S200); and placing the counter-rotating propeller 100 connected to an end of the dual shaft 300 outside the stern of the hull 10 (S300).

[0098] In step S100, a dual rotor motor 200 for supplying rotational power to the counter-rotating propeller 100 may be disposed inside the hull 10.

[0099] Specifically, in step S100, a double rotor motor 200 disposed inside the hull 10 may have a rotor 210 and a stator 220, each pair of which is operated by induction power, sequentially arranged.

[0100] In step S100 of the method for manufacturing a propulsion device according to one embodiment of the present invention, a rotor 210 and a stator 220 can be arranged in a dual rotor motor 200 in order to generate rotational power in the same direction as the rotation of the propellers of the counter-rotating propeller 100.

[0101] In step S100, by arranging the rotor 210 and the stator 220 in a dual rotor motor 200, the rotation directions of the front propeller 110 and the rear propeller 120 of the counter-rotating propeller 100 can be controlled to be different from each other.

[0102] For example, by doubling the rotor 210 and the stator 220 in the dual rotor motor 200 in step S100, when the front propeller 110 rotates in one direction, the rear propeller 120 can rotate in the opposite direction to the rotation direction of the front propeller 110.

[0103] In step S200, a double shaft 300 may be disposed at the end of the double rotor motor 200 disposed inside the hull 10 in step S100.

[0104] Specifically, in step S200, the dual shaft 300 may be connected to the end of the dual rotor motor 200 arranged inside the hull 10, and may be configured to extend from the dual rotor motor 200 to the stern boss of the hull 10.

[0105] In step S200, the double shaft 300 may be configured to include an outer shaft 310 and an inner shaft 320 connected to the ends of the double rotor motor and rotating in opposite directions.

[0106] In step S200, the double shaft 300 may have bearings for supporting the outer shaft 310 and the inner shaft 320 disposed on one side where the outer shaft 310 and the hull 10 intersect.

[0107] In step S300, the counter-rotating propeller 100 may be disposed on the other side of the dual shaft 300 located at the stern boss of the hull 10, in the opposite direction to one side of the dual shaft 300 connected to the end of the dual rotor motor 200.

[0108] Specifically, the counter-rotating propellers 100 in step S300 may be directly connected to the hull 10 by being disposed on a double shaft 300 located at the stern boss of the hull 10.

[0109] In other words, in the manufacturing method of the hull-mounted propulsion device 1000 with counter-rotating propellers according to an embodiment of the present invention, the dual rotor motor 200 and dual shaft 300 according to an embodiment of the present invention are disposed inside the hull 10, thereby eliminating the need for a gearbox from the drive shaft that rotates the propeller to propel the ship, thereby facilitating maintenance of the ship.

[0110] Furthermore, since the counter-rotating propeller 100 according to the embodiment of the present invention is disposed at the end of the double shaft 300 located at the stern boss of the hull 10, the inflow into the counter-rotating propeller 100 is less disturbed by other structures of the hull (e.g., housing or strut), thereby increasing the propulsion efficiency of the counter-rotating propeller 100.

[0111] The above describes various preferred embodiments of the present invention using some examples. However, the description of the various embodiments in this "Form for Implementing the Invention" section is for illustrative purposes only, and a person having ordinary knowledge in the technical field to which the present invention pertains will understand from the above description that the present invention can be implemented in various modified forms or in an equivalent manner to the present invention.

[0112] Furthermore, since the present invention can be embodied in various other forms, the present invention is not limited to the above description. The above description is provided solely to ensure that the disclosure of the present invention is complete and to fully convey the scope of the present invention to those skilled in the art to which the present invention pertains. It should be understood that the present invention is defined solely by the claims. [Explanation of symbols]

[0113] 10 Hull 100 Counter-rotating thruster 110 forward propeller 120 rear propeller 200 Double rotor motor 210 Rotor 212 External Rotor 214 Internal Rotor 220 Stator 222 External Coil 224 Internal Coil 300 double shaft 310 Outer shaft 320 inner shaft 1000 Reciprocating propeller direct-coupled propulsion system

Claims

1. Counter-rotating propellers consisting of a front propeller and a rear propeller; a dual rotor electric motor for generating the respective rotational directions of the front and rear propellers; and a dual shaft connecting the counter-rotating propellers and the dual rotor motor; The double rotor motor comprises: A plurality of rotors and a plurality of stators operated by induction power are arranged in pairs in order to rotate the counter-rotating propeller. A reciprocating propulsion system directly connected to the hull.

2. The counter-rotating propellers are The double shaft is connected to the end of the stern of the hull and is disposed outside the stern.

2. The counter-rotating propeller direct-coupled type ship propulsion system according to claim 1.

3. The counter-rotating propellers are The front propeller and the rear propeller are disposed on the dual shafts and rotate in different directions.

3. The counter-rotating propeller direct-coupled ship propulsion system according to claim 2.

4. The rotor is The double-rotor motor includes an external rotor that is disposed outside the double-rotor motor and rotates in one direction, and an internal rotor that rotates in a direction opposite to the rotation direction of the external rotor.

2. The counter-rotating propeller direct-coupled type ship propulsion system according to claim 1.

5. The rotor is The outer rotor and the inner rotor include permanent magnets or rotor cores.

5. The counter-rotating propeller direct-coupled type ship propulsion system according to claim 4.

6. The stator includes: An external coil that controls the external rotor and an internal coil that controls the internal rotor.

5. The counter-rotating propeller direct-coupled type ship propulsion system according to claim 4.

7. The stator includes: When the external coil and the internal coil are used simultaneously, the stator is configured with one stator, and when the external coil and the internal coil are used separately, the stator is configured with a plurality of stators.

7. The counter-rotating propeller direct-coupled type ship propulsion system according to claim 6.

8. The dual shaft is The rotor is connected to the end of the double rotor motor, and one side rotates in one direction and the other side rotates in the opposite direction to the one side.

2. The counter-rotating propeller direct-coupled type ship propulsion system according to claim 1.

9. The dual shaft is The double rotor motor includes an outer shaft and an inner shaft connected to the ends thereof and rotating in opposite directions.

2. The counter-rotating propeller direct-coupled type ship propulsion system according to claim 1.

10. The dual shaft is A bearing for supporting the outer shaft and the inner shaft is disposed on one side where the outer shaft and the hull intersect.

10. The counter-rotating propeller direct-coupled ship propulsion system according to claim 9.

11. (a) disposing a dual rotor motor inside the hull to generate the respective rotation directions of the front and rear propellers of the counter-rotating propellers; (b) disposing a double shaft connected to the ends of the double rotor motor inside the hull; and (c) the counter-rotating propellers are connected to the ends of the dual shafts and are disposed outside the stern of the hull; The step (a) comprises: The double rotor motor is characterized in that a plurality of rotors and a plurality of stators operated by induction power are arranged in pairs in sequence. A method for manufacturing a ship's direct-coupled propulsion device with counter-rotating propellers.

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