Energy harvester integrated on the rotational shaft system

Abstract

An energy harvester integrated in a rotating shaft system is provided, comprising a rotating shaft and one or more bearings supporting the rotating shaft. The energy harvester integrated in the rotating shaft system is fixed by being connected to one or more bearings and includes a stator configured to accommodate a permanent magnet and a rotor in which a multilayer coil sheet, comprising a multilayer coil sheet including a multilayer coil contained in a multilayer flexible PCB, is attached while surrounding the outer edge of the rotating shaft, and the permanent magnet contained in the stator and the rotor are arranged to face each other. [National Project Information] (Korean) This project (result) is the result of the Local Government-University Cooperation-based Regional Innovation Project conducted in 2023 with funding from the Ministry of Education and support from the National Research Foundation of Korea. (2021RIS-002) (English) This research was supported by "Regional Innovation Strategy (RIS)" through the National Research Foundation of Korea (NRF) funded by the Ministry of Education (MOE) (2021RIS-002)

Description

Technology Field

[0001] The present invention relates to an energy harvester used in a rotating shaft system. Background Technology

[0002] Various machines are equipped with rotary shaft systems necessary for mechanical operation and are used for power transmission. For example, a rotary shaft system is installed to operate a propeller that propels a ship using its engine. Generally, the rotary shaft system that rotates a ship's screw consists of a rotating shaft and bearings that support the shaft.

[0003] Recently, technology is being used to monitor the condition of a ship's propulsion shaft by utilizing various sensors, such as the rotational speed of the shaft that serves as the ship's propulsion shaft, temperature sensors that detect bearing abnormalities, and strain gauge sensors that detect abnormal vibrations of the shaft. Since these various multiple sensors for monitoring the condition of the ship's propulsion shaft each receive power from an external source to operate, and the signals detected by each of the multiple sensors are individually transmitted, analyzed, and stored, there is a disadvantage that the cost of manufacturing and maintaining the ship increases due to the point-to-point structure in which the wiring for power and sensor signals is directly connected.

[0004] Therefore, energy harvesting technology is required to generate self-power from the rotational force of the drive shaft without an external power source or battery, and supply it to a sensor system containing multiple sensors. Prior art literature

[0005] U.S. Patent Publication US 2005-0017602A1, Shaft mounted energy harvesting for wireless sensor operation and data transmission, published January 27, 2005 The problem to be solved

[0006] The problem that the present invention aims to solve is to provide an energy harvester integrated in a rotating shaft system capable of producing ultra-compact, high-power energy by employing an energy harvester structure in which a rotor and a stator are integrated, which can supply power produced through energy harvesting from the propulsion shaft to a sensor system including a plurality of sensors that monitor the operating status of the propulsion shaft of a ship. means of solving the problem

[0007] An energy harvester integrated in a rotating shaft system according to one aspect of the present invention, comprising a rotating shaft and one or more bearings supporting the rotating shaft, wherein the energy harvester comprises a stator connected to and fixed to one or more bearings and configured to accommodate a permanent magnet, and a rotor in which a multilayer coil sheet, each comprising a multilayer coil sheet including a multilayer coil contained in a multilayer flexible PCB, is stacked in multiple layers and attached to surround the outer edge of the rotating shaft, and the permanent magnet contained in the stator and the rotor are arranged to face each other.

[0008] A plurality of via contacts may be formed in each of the multilayer flexible PCBs to interconnect the coils of the multilayers.

[0009] A multilayer coil sheet can be configured to include 12 coils in the horizontal direction per coil sheet.

[0010] In one coil sheet, a total of 4 layers of flexible PCBs, each with a coil installed, are formed vertically, and the 4 layers of coils installed on the 4 layers of flexible PCBs are interconnected through wiring connected to the 4 layers of flexible PCBs, and the thickness of each layer of flexible PCB is 0.25 [mm], and the number of turns of each layer of coil may be 46.

[0011] Each of the multilayer coil sheets includes a first via hole and a second via hole for interconnection, and when the multilayer coil sheet includes a first coil sheet, a second coil sheet, a third coil sheet, a fourth coil sheet, a fifth coil sheet, and a sixth coil sheet, the first coil sheet and the second coil sheet are wired connected through the first via hole of the first coil sheet and the first via hole of the second coil sheet, the first coil sheet and the sixth coil sheet are wired connected through the second via hole of the first coil sheet and the second via hole of the sixth coil sheet, the second coil sheet and the third coil sheet are wired connected through the second via hole of the second coil sheet and the first via hole of the third coil sheet, the third coil sheet and the fourth coil sheet are wired connected through the second via hole of the third coil sheet and the first via hole of the fourth coil sheet, and the fourth coil sheet and the fifth coil sheet are wired through the second via hole of the fourth coil sheet and the first via hole of the fifth coil sheet. The fifth coil sheet and the sixth coil sheet can be wired connected through the second via hole of the fifth coil sheet and the first via hole of the sixth coil sheet.

[0012] When one or more bearings are multiple bearings, the multiple bearings support a rotating shaft and are installed spaced apart along the longitudinal direction of the rotating shaft, and the stator is connected and fixed to each of the outer rings of the spaced-apart bearings, and the rotor is positioned between the spaced-apart bearings, and when the multiple bearings are configured to include a left bearing located to the left of the rotor and a right bearing located to the right of the rotor, the stator includes multiple permanent magnets having different polarities, a magnet fixing part for fixing the multiple permanent magnets, and a first type stator connecting part configured to connect the magnet fixing part to the outer rings of the multiple bearings, and the first type stator connecting part may include a left bearing outer ring connecting part connected and fixed to the outer ring of the left bearing and a right bearing outer ring connecting part connected and fixed to the outer ring of the right bearing.

[0013] When the bearing further includes a bearing housing surrounding the outer ring of the bearing, the stator may include a plurality of permanent magnets having different polarities, a magnet fixing part for fixing the plurality of permanent magnets, and a wing-shaped second type stator connecting part for connecting the magnet fixing part to the bearing housing.

[0014] It further includes a battery that charges power produced by an energy harvester, and can supply the charged power as power to a separate sensor system circuit at low speed or during the initial stages of ship operation. Effects of the invention

[0015] According to the present invention, power produced through energy harvesting from a propulsion shaft can be supplied to a sensor system comprising a plurality of sensors that monitor the operating status of a propulsion shaft of a ship, and an energy harvester integrated in a rotating shaft system capable of producing ultra-compact, high-power energy can be provided by employing an energy harvester structure in which a rotor and a stator are integrated.

[0016] According to the present invention, a micro energy harvester can be provided by forming a micro three-dimensional coil by stacking and connecting multiple coils formed on a two-dimensional PCB substrate, and since the circuit of the sensor system can be configured at the same time as forming the coil on the PCB, the size, power consumption, and manufacturing cost of the sensor system can be reduced.

[0017] According to the present invention, an energy harvester with a structure that can be easily installed on a ship after construction is provided, thereby enabling the energy harvester to be installed on existing ships without difficulty in the future.

[0018] By utilizing the energy harvester integrated in the rotating shaft system according to the present invention, it can be applied to rotating shaft systems used in various fields and environments, such as ships, aircraft, and factory facilities, and utilized for self-generation of energy. Brief explanation of the drawing

[0019] FIG. 1 is a diagram showing the configuration of an energy harvester integrated in a rotating shaft system according to one embodiment of the present invention. Figure 2 is a diagram showing a cross-section of an energy harvester integrated in the rotational shaft system of Figure 1. Figure 3 is a drawing showing the layout of a rotor coil included in a rotor configured on the rotation axis of Figure 1. Figure 4 is a drawing showing a cross-section of a rotor configured on the propulsion shaft of Figure 1. Figure 5 is a drawing showing the configuration of the coil sheet constituting the rotor of Figure 3. Figure 6 is a diagram showing the connection structure of each coil configured in one coil sheet of Figure 5. Figure 7 is a drawing showing the vertical connection structure of the rotor coils composed of six coil sheets as illustrated in Figure 6. Figure 8 is a diagram showing a configuration in which power generated from the coil sheet of Figure 5 is supplied to a wireless sensor system. Figure 9 is a diagram showing the configuration of the stator of the energy harvester of Figure 1. Figure 10 is a drawing showing another example of the stator of Figure 9. FIG. 11 is a graph showing the average voltage and average power characteristics of a power source generated in an energy harvester according to one embodiment of the present invention. FIG. 12 is a diagram showing the configuration of a stator of an energy harvester according to another embodiment of the present invention. FIG. 13 is a drawing showing the configuration of the stator of FIG. 12 in detail. Specific details for implementing the invention

[0020] Hereinafter, an embodiment of the present invention will be described in detail with reference to the attached drawings. In describing the present invention, specific descriptions of related known functions or configurations will be omitted if it is determined that such detailed descriptions may unnecessarily obscure the essence of the present invention. Furthermore, the terms described below are defined considering their functions in the present invention, and these may vary depending on the intentions or conventions of the user or operator. Therefore, their definitions should be based on the content throughout this specification.

[0021] FIG. 1 is a diagram showing the configuration of an energy harvester integrated in a rotating shaft system according to one embodiment of the present invention. FIG. 2 is a diagram showing a cross-section of an energy harvester integrated in the rotating shaft system of FIG. 1.

[0022] Referring to FIGS. 1 and 2, the rotating shaft system (100) includes a rotating shaft (110) and a bearing (120) that supports the rotating shaft (110). The rotating shaft (110) is a shaft that performs rotational motion and may be a propulsion shaft of a ship, an aircraft, or a shaft of a rotating shaft system used in factory equipment; however, for convenience of explanation, a propulsion shaft of a ship is used as an example for this description.

[0023] Although FIG. 1 illustrates a configuration in which a plurality of bearings (120) are installed to support a rotating shaft (110), it is not limited thereto. A case in which a single bearing (120) is used to support a rotating shaft (110) according to another embodiment of the present invention will be described later with reference to FIG. 12.

[0024] A plurality of bearings (120) are configured to fix the rotation shaft (110) in a fixed position, support the rotation shaft (110), reduce friction, enable rotation of the rotation shaft (110), and increase rotational efficiency. The plurality of bearings (120) are installed spaced apart in the longitudinal direction (or axial direction) (d) of the rotation shaft (110).

[0025] An energy harvester (200) integrated in a rotating shaft system (100) includes a rotor (220), a stator (210), and a plurality of bearings (120), and the bearings (120) are composed of an inner ring (122) and an outer ring (124).

[0026] Each bearing (120) includes a connecting part (126) that includes a rolling element (not shown) and a retainer (not shown) between the inner ring (122) and the outer ring (124). Here, the inner ring (112) of the plurality of bearings (120) is directly connected to the rotation shaft (110) and rotates in the same manner as the rotation of the rotor (220) configured on the rotation shaft system (100), and the outer ring (124) is connected to the stator (210) and is a fixed part that does not move even with the rotation of the rotation shaft system (100).

[0027] The stator (210) is connected to and fixed by one or more bearings (120) and is configured to accommodate a permanent magnet (10). The rotor (220) is formed by a multilayer coil sheet, each containing a multilayer coil contained in a multilayer flexible PCB, being laminated in multiple layers, and is attached to surround the outer edge of the rotation axis. The permanent magnet (10) contained in the stator (210) and the coil of the rotor (220) are arranged to face each other.

[0028] Referring to FIG. 1, a permanent magnet (10) is attached as a stator (210) to the outer ring (124) of a plurality of bearings (120) attached to a rotating shaft (110). A rotor (220) is positioned between a plurality of bearings (120) installed at a predetermined interval and is configured to be fixed while surrounding the outer edge of the rotating shaft (110). The permanent magnet (10) included in the stator (210) and the rotor (220) are arranged to face each other so that the electromotive force of the permanent magnet (10) can be efficiently induced into the coil (310) included in the rotor (220).

[0029] As illustrated in FIGS. 1 and 2, the energy harvester (200) according to the present invention has the stator (210) and the rotor (220) simultaneously integrated on the rotation axis (110), so that a separate structure for fixing the stator (210) is not required. By adopting the structure of the energy harvester (200) in which the rotor (220) and the stator (210) are integrated in this way, an energy harvester (200) integrated on the rotation axis system (100) capable of producing ultra-small high-power energy can be provided.

[0030] FIG. 3 is a drawing showing the layout of a rotor coil included in a rotor (220) configured on the rotation axis (110) of FIG. 1.

[0031] The rotor (220) is fixed to the outer edge of the rotation shaft (110), and the rotor (220) is formed by stacking multiple layers of coils (310) configured on a multilayer flexible PCB (320). The flexible PCB (320) is formed as a thin film and can be formed from a material having excellent heat resistance, good impact resistance and dimensional stability, and excellent electrical properties, such as polyamide resin. The coils (310) can be formed by patterning a conductive metal, such as copper (Cu) or silver (Ag), which has excellent conductivity, on the flexible PCB (320) through a plating process. The coils (310) can be deposited as an insulating film, excluding the central electrode portion and the edge electrode portion of the coil (310).

[0032] Since the number of turns of the coil (310) included in the flexible PCB (320) and the electromotive force induced therein are proportional, increasing the number of turns of the coil (310) is important for high power production of the energy harvester (200). The rotor (220) can be configured to be fixed by wrapping around the circumference of the rotation axis (110), including an adhesive sheet.

[0033] According to one embodiment of the present invention, the coil (310) of the rotor (220) is configured as a square with a conductor line width and spacing of 0.25 [mm], a total of 46 turns, and a length and width of 60 [mm], which may be configured as a circle or a polygon. The number of turns and the conductor line width and spacing of the coil (310) of the rotor (220) may be varied according to the required power being designed.

[0034] Since the rotor (220) is formed by a multilayer coil (310) stacked on a multilayer flexible PCB (320), it is possible to design a micro-sized high-power energy harvester (200) with almost no volume. As the rotation of the rotation axis (110) occurs, the multilayer coil (310) included in the rotor (220) rotates at the same speed, and the magnetic flux of the coil (310) of the rotor (220) changes due to the permanent magnet included in the stator (210), thereby inducing electricity in the coil (310) of the rotor (220). A plurality of via contacts (331, 332, 333, 334) are formed on the multilayer flexible PCB (320) to interconnect the multilayer coil (310) stacked according to the stacking of the multilayer flexible PCB (320).

[0035] Additionally, the energy harvester (200) may further include a sensor system circuit (230) that detects at least one of vibration, temperature, and pressure of the rotating shaft system (100). The sensor system circuit (230) may be configured as a self-generating wireless sensor system by further including one or more sensing modules (not shown) that detect at least one of vibration, temperature, and pressure of the rotating shaft system (100), a rectifier (not shown) that converts an analog signal detected by one or more sensing modules into a digital signal, and a communication module (not shown) for wirelessly transmitting the detected sensor data to an external control device.

[0036] The sensor system circuit (230) can be integrated and installed in a separate space separated from the space of the flexible PCB in which the coil, which is the rotor (220), is configured. According to the present invention, by integrating the wireless sensor system into the outer space of the rotor (220), which is formed by a coil composed of a stack of multilayer flexible PCBs, and a separate rotation axis (110), a micro-wireless sensor system capable of integrating multiple sensors and systems can be manufactured.

[0037] Additionally, power produced by the energy harvester (200) can be charged into a battery (not shown) to supply power to a separate sensor system circuit (230) at low speed or during the initial stages of ship operation.

[0038] FIG. 4 is a drawing showing a cross-section of a rotor (220) configured on the propulsion shaft (110) of FIG. 1.

[0039] As shown in FIG. 4, the rotor (220) can increase the number of coil windings by stacking multiple coil sheets (410, 420, 430, 440, 450, 460) composed of a flexible PCB (320) having coils (310) configured thereon, and connecting each coil to each other. Six coil sheets (410, 420, 430, 440, 450, 460), including a first coil sheet (410), a second coil sheet (420), a third coil sheet (430), a fourth coil sheet (440), a fifth coil sheet (450), and a sixth coil sheet (460), can be sequentially stacked and fixed from the rotation axis (110). The number of coil sheets fixed and stacked on the rotation axis (110) can be varied. The six coil sheets (410, 420, 430, 440, 450, 460) may be configured to include 12 coils in the horizontal direction per coil sheet, and may include multilayer coils installed on a multilayer flexible PCB in the vertical direction per coil sheet as described below with reference to FIG. 5.

[0040] FIG. 5 is a drawing showing the configuration of the coil sheet constituting the rotor (220) of FIG. 1.

[0041] As shown in FIG. 5, the first coil sheet (410) may be configured to include 12 coils (501 to 512) in the horizontal direction. The number of coils included in the horizontal direction in one coil sheet may vary depending on the embodiment.

[0042] FIG. 6 is a drawing showing the connection structure of each coil (501 to 512) configured on one coil sheet (410) of FIG. 5.

[0043] The vertical structure of one coil (501) consists of four coils (501-1, 501-2, 501-3, 501-4) stacked in four layers, each installed on four flexible PCBs.

[0044] In the first coil sheet (410), the thickness of each layer of the flexible PCB (320) is 0.25 [mm], the number of turns of each layer of the coil is 46, and it is composed of a total of 4 layers. Since the 4 coils (501-1, 501-2, 501-3, 501-4) are interconnected through wiring connected to the 4 layers of the flexible PCB, the total number of turns of each coil included in the first coil area (501) of the first coil sheet (410) is 184 (= 46 x 4).

[0045] The center electrode portion (a) at the center of the first layer coil (501-1) is connected to the center electrode portion (a) of the second layer coil (501-2) by the wiring (12) of the first via contact, the edge electrode portion (b) at the edge of the second layer coil (501-2) and the edge electrode portion (b) of the third layer coil (501-3) are connected to each other by the wiring (23) of the second via contact, the center electrode portion (a) of the third layer coil (501-3) and the center electrode portion (a) of the fourth layer coil (501-4) are connected to each other by the wiring (34) of the third via contact, the edge electrode portion (b) of the first layer coil (501-1) is connected to the via hole (412) of the fourth layer coil (501-4) by the wiring (14) of the via contact, and the fourth layer The edge wiring of the coil (501-4) is connected to the via hole (411). Thus, the coils of the four layers (501-1, 501-2, 501-3, 501-4) are electrically composed of a single coil, and the coil (501) has via holes (411, 412) for circuit connection of the edge wiring, and the two via holes (411, 412) are composed of electrodes (D) connected to internal wiring (C), and the coil connection of each layer can be checked.

[0046] The 12 coils (501 to 512) of the first coil sheet (410) all have the same vertical connection structure as shown in FIG. 6.

[0047] According to one embodiment of the present invention, since the number of turns of each coil (501-1, 501-2, 501-3, 501-4) stacked in 4 layers is 46, the coil (510) composed of connected coils (501-1, 501-2, 501-3, 501-4) operates electrically as a coil with a total number of turns of 184.

[0048] FIG. 7 is a drawing showing the vertical connection structure of the coils of a rotor (220) composed of six coil sheets as shown in FIG. 4.

[0049] Each coil sheet (420, 430, 440, 450, 460), including the first coil sheet (410), has two via holes (411, 412, 421, 422, 431, 432, 441, 442, 451, 452, 461, 462) formed for interconnection. Each coil sheet (420, 430, 440, 450, 460) is configured to include 12 coils of four layers stacked on four flexible PCBs (320), as described with reference to FIG. 6.

[0050] The flexible PCB (320) of the first coil sheet (410) includes a first via hole (411) and a second via hole (412). The flexible PCB (320) of the second coil sheet (420) includes a first via hole (421) and a second via hole (422). The flexible PCB (320) of the third coil sheet (430) includes a first via hole (431) and a second via hole (432). The flexible PCB (320) of the fourth coil sheet (440) includes a first via hole (441) and a second via hole (442). The flexible PCB (320) of the fifth coil sheet (450) includes a first via hole (451) and a second via hole (452). The flexible PCB (320) of the sixth coil sheet (460) includes a first via hole (461) and a second via hole (462).

[0051] The first coil sheet (410) and the second coil sheet (420) are wired connected through the first via hole (411) of the first coil sheet (410) and the first via hole (421) of the second coil sheet (420). The first coil sheet (410) and the sixth coil sheet (460) are wired connected through the second via hole (412) of the first coil sheet (410) and the second via hole (462) of the sixth coil sheet (460). The second coil sheet (420) and the third coil sheet (430) are wired connected through the second via hole (422) of the second coil sheet (420) and the first via hole (431) of the third coil sheet (430). The third coil sheet (430) and the fourth coil sheet (440) are wired through the second via hole (432) of the third coil sheet (430) and the first via hole (441) of the fourth coil sheet (440). The fourth coil sheet (440) and the fifth coil sheet (450) are wired through the second via hole (442) of the fourth coil sheet (440) and the first via hole (451) of the fifth coil sheet (450). The fifth coil sheet (450) and the sixth coil sheet (460) are wired through the second via hole (452) of the fifth coil sheet (450) and the first via hole (461) of the sixth coil sheet (460). In this way, since the coils inside the 6-layer coil sheets (410, 420, 430, 440, 450, 460) are connected by wiring (C), a single coil of 24 layers of rotor coils (310) is electrically formed in the first coil area (501).

[0052] According to one embodiment of the present invention, the number of windings of each coil (501) stacked in 4 layers is 184 in total, and a total of 6 layers of coil sheets are electrically connected thereto so that the first coil area (501) operates as a coil with a total number of windings of 1,104.

[0053] In the sixth coil sheet (460), coil electrode terminals (463, 464) are further formed to which the coils of each layer included in the first coil sheet (410) to the sixth coil sheet (460) are connected.

[0054] All of the second coil region (502) to the twelfth coil region (512) are connected in the same way as the first coil region (510). Accordingly, the coils of each coil region (501 to 512) can be connected in parallel by forming respective coil electrode terminals.

[0055] According to one embodiment of the present invention, the rotor coil (310) is composed of and connected with six coil sheets (410 to 460), so that the total number of turns of each rotor coil (310) is 1,104 (=184 x 6) and the thickness is 1.5 [mm].

[0056] FIG. 8 is a diagram showing a configuration in which power generated from the coil sheet of FIG. 7 is supplied to the sensor system circuit (230).

[0057] As described with reference to FIG. 4, six coil sheets (410, 420, 430, 440, 450, 460) can be stacked and the coils (310) configured in each layer can be connected to form one large-capacity coil electrically.

[0058] A total of 12 coils (501 to 512) configured in a multilayer flexible PCB (320) each have an electrode terminal, and the electrode terminals are configured as positive (+) and negative (-) poles. All positive poles of the 12 coils (501 to 512) are each connected in parallel by a single wire (801), and all negative poles of the 12 rotor coils (501 to 512) are each connected in parallel by a single wire (802), so that when the rotating shaft (110) rotates, the magnetic flux linking with each coil (501 to 512) can effectively induce electricity.

[0059] A total of 12 coils (501 to 502) are configured in the horizontal direction for each layer of PCB (320). When each coil sheet (410 to 460), composed of a 4-layer flexible PCB (320) including a 4-layer coil, is bonded and fixed around the rotation axis (110), a single small electric rotor coil (501 to 502) with a height of 1.5 mm can be formed on the rotation axis (110).

[0060] A wireless sensor system capable of self-generation can be configured by connecting the positive and negative poles of all coils (501 to 512) to a rectifier (810) to convert the induced AC power into DC power and using it as a power source for a sensor system circuit (230) configured on a rotating shaft.

[0061] FIG. 9 is a diagram showing the configuration of the stator (210) of the energy harvester (200) of FIG. 1.

[0062] In order to induce electricity in each coil (501 to 512) as the rotor coils (501 to 512) formed on the rotating shaft (110) rotate, a stator (210) in which a permanent magnet (10) is integrated is fixed to the outer ring (126) of two bearings (120) installed on both sides of the rotor coils (501 to 512), and the stator (210) is attached to the outer ring (126) of each bearing (120). The permanent magnet (10) may include an N-pole permanent magnet (11) and an S-pole permanent magnet (12).

[0063] The stator (210) is configured to include a stator connection part (310, 320) comprising a left bearing outer ring connection part (310) that is connected and fixed to the outer ring (124) of a left bearing (120) located on the left side of the rotor (220) and a right bearing outer ring connection part (320) located on the right side of the rotor (220), permanent magnets (11, 12), and a magnet fixing part (330) that fixes the permanent magnets (11, 12). The magnet fixing part (330) is configured to include a plurality of grooves into which the permanent magnets (10) are inserted, so that the permanent magnets (10), including the N-pole permanent magnet (11) and the S-pole permanent magnet (12), are integrated.

[0064] In this way, the stator (210) can be integrated into the rotating shaft (110) by being fitted and fixed to the two bearings (120) on the left and right sides of the rotor coils (501 to 512). Accordingly, when the rotating shaft (110) rotates, it is stopped by the weight of the stator (210) itself, which is fixed to the outer ring (126) of the bearing (120), so that the magnetic flux of the permanent magnet (10) can link with the multi-layered rotor coils (501 to 512).

[0065] FIG. 10 is a drawing showing another embodiment of the stator (210) of FIG. 9.

[0066] As shown in FIG. 10 (a), two stators (210) can be installed and used, configured to be connectable to the outer rings of two bearings (120) that are spaced apart at a predetermined interval in the longitudinal direction (d) of the rotation axis (110). As shown in FIG. 10 (b), the stators (210) can be configured to be connected to the outer rings of the bearings (120) by being composed of three. As shown in FIG. 10 (c), the stators (210) can be configured to be connected to the outer rings of the bearings (120) by being composed of four. In this way, the design can be modified by adding the number of stators (210) and the corresponding number of rotors (220) to suit the design power to be produced, in order to increase the amount of magnetic flux linking with the rotor coils (501 to 512) and increase the induced electricity.

[0067] According to the present invention, the stator connection part (310, 320) includes a left bearing outer ring connection part (310) and a right bearing outer ring connection part (320), and by using a stator (210) configuration that is fitted and fixed to two bearings (120) on the left and right sides of the rotor coil (501 to 512), an energy harvester with a structure that can be easily installed on a ship after construction is provided.

[0068] FIG. 11 is a graph showing the average voltage and average power characteristics of the power generated in an energy harvester (200) according to one embodiment of the present invention.

[0069] FIG. 11 is a graph measuring the power generation characteristics of an energy harvester (200) composed of 6 permanent magnets (10) and 12 rotor coils (501 to 512), using 3 stators (210) fixed to 2 bearings (120) around a rotating shaft (110) as shown in FIG. 10 (c) according to one embodiment of the present invention. As shown in FIG. 11, according to one embodiment of the present invention, power and voltage increase with increasing rotational speed of the rotating shaft (110), and an average power of 1.3 [W] can be produced at a rotational speed of 100 [rpm].

[0070] FIG. 12 is a drawing showing the configuration of a stator (210) of an energy harvester (200) according to another embodiment of the present invention. FIG. 13 is a drawing showing the configuration of the stator (210) of FIG. 12 in detail.

[0071] As described with reference to FIG. 12, the bearing (120) of FIG. 12 includes a connecting part (126) that includes a rolling element (not shown) and a retainer (not shown) between the inner ring (122) and the outer ring (124). In addition, the bearing (120) of the rotating shaft system (100) of FIG. 12 is configured to further include a bearing housing (128) that surrounds the outer ring (124) of the bearing (120) in addition to the inner ring (122), the outer ring (124), and the connecting part (126). As described with reference to FIG. 1, the inner ring (112) of the bearing (120) is directly connected to the rotating shaft (110) and rotates in the same manner as the rotation of the rotor (220) configured on the rotating shaft system (100), and the outer ring (124) is connected to the stator (210) and is a fixed part that does not move even with the rotation of the rotating shaft system (100).

[0072] The configuration of the rotor (220) of FIG. 12 is as described with reference to FIG. 3 to 7. In the stator (210) of FIG. 12, permanent magnets (10) are integrated to induce electricity in each coil (501 to 512) as the rotor coils (501 to 512) formed on the rotation axis (110) rotate. The permanent magnets (10) may include N-pole permanent magnets (11) and S-pole permanent magnets (12).

[0073] The stator (210) of FIG. 12 includes a plurality of permanent magnets (10) having different polarities, a magnet fixing part (1330) for fixing the plurality of permanent magnets (10), and a wing-shaped stator connecting part (1310) for connecting the magnet fixing part (1330) to a bearing housing (128). The magnet fixing part (1330) into which the plurality of permanent magnets (10) arranged facing each other on the rotor (220) are inserted and the wing-shaped stator connecting part (1310) can be configured to be perpendicular to each other.

[0074] According to the present invention, by using a stator (210) that includes a wing-shaped stator connection part (1310) for connecting to a bearing housing (128), an energy harvester with a structure that can be easily installed on a ship after construction is provided.

[0075] For convenience of explanation, a component including a left bearing outer ring connecting part (310) and a right bearing outer ring connecting part (320) of a stator (210) installed on a plurality of bearings (120) spaced apart from each other as shown in FIGS. 9 and 10 is called a first type stator connecting part, and a wing-shaped stator connecting part (1310) for connecting to a bearing housing (128) of one bearing (120) as shown in FIGS. 12 and 13 can be called a second type stator connecting part.

[0076] As shown in FIG. 13 (a), the stator (210) may be configured to include two permanent magnets (11, 12), and as shown in FIG. 13 (b), the stator (210) may be configured to include six permanent magnets (11, 12). In this way, the design may be modified by adding the number of permanent magnets included in the stator (210) and the corresponding number of rotors (220) to increase the amount of magnetic flux linking with the rotor coils (501 to 512) to increase the induced electricity, in order to suit the design power to be produced.

[0077] The above description is merely one embodiment of the present invention, and those skilled in the art may implement it in modified forms without departing from the essential characteristics of the present invention. Accordingly, the scope of the present invention should not be limited to the aforementioned embodiments but should be interpreted to include various embodiments within the scope equivalent to that described in the patent claims. Explanation of the symbols

[0078] 100: Rotational shaft system 110: Rotation axis 120: Bearing 200: Energy Harvester 210: Stator 220: Rotor 230: Sensor System Circuit 410, 420, 430, 440, 450, 460: Coil Sheet

Claims

Claim 1 An energy harvester integrated in a rotating shaft system comprising a rotating shaft and one or more bearings supporting the rotating shaft, wherein the energy harvester comprises: a stator connected to and fixed to one or more bearings and configured to accommodate a permanent magnet; and a rotor comprising a multilayer coil sheet formed by stacking multiple layers of coil sheets each containing a multilayer coil contained in a multilayer flexible PCB, the rotor being attached to surround the outer edge of the rotating shaft; wherein the permanent magnet included in the stator and the rotor are arranged to face each other, and the bearing further comprises a bearing housing that surrounds the outer ring of the bearing, wherein the stator comprises a plurality of permanent magnets having different polarities, a magnet fixing part for fixing the plurality of permanent magnets, and a wing-shaped second type stator connecting part for connecting the magnet fixing part to the bearing housing, and wherein the magnet fixing part and the wing-shaped second type stator connecting part are configured to be perpendicular to each other. Claim 2 An energy harvester integrated in a rotating shaft system according to claim 1, characterized in that a plurality of via contacts for interconnecting the coils of the multilayer are formed in each of the multilayer flexible PCBs. Claim 3 An energy harvester integrated in a rotating shaft system according to paragraph 2, characterized in that the multilayer coil sheet comprises 12 coils in the horizontal direction per coil sheet. Claim 4 An energy harvester integrated in a rotating shaft system according to claim 3, characterized in that a total of 4 layers of flexible PCBs, each having a coil installed thereon, are formed vertically on a single coil sheet, the 4 layers of coils installed on the 4 layers of flexible PCBs are interconnected through wiring connected to the 4 layers of flexible PCBs, the thickness of each layer of flexible PCB is 0.25 [mm], and the number of turns of each layer of coil is 46. Claim 5 In paragraph 3, the multilayer coil sheet each includes a first via hole and a second via hole for interconnection, and when the multilayer coil sheet includes a first coil sheet, a second coil sheet, a third coil sheet, a fourth coil sheet, a fifth coil sheet, and a sixth coil sheet, the first coil sheet and the second coil sheet are wired connected through the first via hole of the first coil sheet and the first via hole of the second coil sheet, the first coil sheet and the sixth coil sheet are wired connected through the second via hole of the first coil sheet and the second via hole of the sixth coil sheet, the second coil sheet and the third coil sheet are wired connected through the second via hole of the second coil sheet and the first via hole of the third coil sheet, the third coil sheet and the fourth coil sheet are wired connected through the second via hole of the third coil sheet and the first via hole of the fourth coil sheet, and the fourth coil sheet and the fifth coil sheet are wired connected through the second via hole of the fourth coil sheet and the first of the fifth coil sheet An energy harvester integrated in a rotating shaft system, characterized by being wired connected through via holes, and the fifth coil sheet and the sixth coil sheet being wired connected through the second via hole of the fifth coil sheet and the first via hole of the sixth coil sheet. Claim 6 delete Claim 7 delete Claim 8 An energy harvester integrated in a rotating shaft system according to claim 1, further comprising a battery for charging power produced by the energy harvester, and characterized by supplying the charged power as power to a separate sensor system circuit at low speed or during the initial stage of ship operation.

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