Apparatus for measuring torque of superconducting coil, control method thereof and superconducting rotating device using the same

Abstract

The present invention relates to a torque measuring device for a superconducting coil, a control method thereof, and a superconducting rotary machine using the same. A torque measuring device for a superconducting coil according to an embodiment of the present invention comprises: a cryostat for forming a cryogenic environment of the superconducting coil in a modular structure; a cryostat cooling unit for cooling the internal space of the cryostat based on the operating temperature of the superconducting coil; a load cell for measuring the strength of a force acting on the superconducting coil by rotor rotation; and a control unit for measuring the torque of the superconducting coil using the strength of the force measured by the load cell.

Description

Technology Field

[0001] The present invention relates to a torque measuring device for a superconducting coil, a control method thereof, and a superconducting rotor using the same. More specifically, the invention relates to a torque measuring device for a superconducting coil, a control method thereof, and a superconducting rotor using the same, for verifying the mechanical characteristics of a superconducting coil by measuring the torque generated in the superconducting coil using the intensity of the force acting on the superconducting coil by rotor rotation.

[0002] In addition, the present invention relates to a torque measuring device for a superconducting coil, a control method thereof, and a superconducting rotating machine using the same, for accurately measuring the strength of the force acting on the superconducting coil through the load cell even in the internal space of the cryostat by preventing damage to the load cell due to the difference between the operating temperature (20-40K) of the superconducting coil and the operating temperature (77K) of the load cell in the cryostat's cryogenic environment. Background Technology

[0004] Superconductors are devices whose electrical resistance becomes zero at extremely low temperatures. Because they offer advantages such as high magnetic fields, low losses, and miniaturization compared to conventional copper (Cu), they are already being utilized in various application fields.

[0005] A superconducting coil is a coil made using superconductors. These coils are used in MRI, NMR, particle accelerators, and magnetic separation devices to improve efficiency and performance. Furthermore, their application technologies are continuously being researched across various industries, such as power cables, superconducting transformers, and superconducting motors.

[0006] Superconducting rotary machines utilizing superconducting coils are gradually becoming larger. As superconducting coils become larger, they possess high magnetic field characteristics, and due to their superconducting properties, they exhibit a high current density compared to ordinary copper coils.

[0007] In this way, superconducting rotors can be applied to large wind turbines or ship propulsion motors that require high magnetic fields and high torque.

[0008] Conventional rotating machines simply apply a torque meter to the rotor (field) to measure the amount of torque generated, and there is no need to consider the mechanical stability of the coils or permanent magnets.

[0009] However, since superconducting rotors are mechanically vulnerable due to the characteristics of superconducting coils, it is necessary to verify the mechanical properties of each individual superconducting coil.

[0010] However, in the case of large superconducting rotary machines, it is difficult to apply torque meters as with small rotary machines due to their low-speed, high-torque characteristics.

[0011] In addition, when calculating the moment of inertia of such superconducting rotors using the retardation method applied to torque calculations for large land-based rotors, it is not easy to increase the rotational speed to 130% of the rated speed or to verify the torque by applying it to a superconducting generator that operates a synchronous machine as a generator and operates it as a motor. This is because it is difficult to maintain a vacuum and cooling.

[0012] In addition, superconducting rotors have a limitation in that as the capacity increases to the megawatt level, the moment of inertia increases as the diameter of the rotor increases, causing the response speed of the torque controller to slow down. In particular, torque control at wind speeds below the rated wind speed is very important for wind turbines. This is because the maximum output of the wind turbine must be estimated through torque control.

[0013] Therefore, a method for calculating torque by measuring the force received by each superconducting coil in a superconducting rotary machine needs to be devised. Prior art literature

[0015] Japanese Patent Publication No. 5165614 (Registered Dec. 28, 2012) The problem to be solved

[0016] The objective of the present invention is to provide a torque measuring device for a superconducting coil, a control method thereof, and a superconducting rotor using the same, for verifying the mechanical properties of a superconducting coil by measuring the torque generated in the superconducting coil using the strength of the force acting on the superconducting coil by rotor rotation.

[0017] In addition, another objective of the present invention is to provide a torque measuring device for a superconducting coil, a control method thereof, and a superconducting rotary machine using the same, which prevents damage to the load cell due to the difference between the operating temperature (20-40K) of the superconducting coil and the operating temperature (77K) of the load cell in the cryostat's cryostat environment, thereby accurately measuring the strength of the force acting on the superconducting coil through the load cell even in the internal space of the cryostat. means of solving the problem

[0019] A torque measuring device for a superconducting coil according to an embodiment of the present invention may include: a cryostat (110) for forming a cryogenic environment of a superconducting coil (10) into a modular structure; a cryostat cooling unit (120) for cooling the internal space of the cryostat based on the operating temperature of the superconducting coil; a load cell (130) for measuring the strength of a force acting on the superconducting coil by rotor rotation; and a control unit (140) for measuring the torque of the superconducting coil using the strength of the force measured by the load cell.

[0020] The above cryostat may individually house the above superconducting coil inside.

[0021] According to an embodiment, it may further include a first laminated insulating material (150) that forms a thermal barrier layer between the cryostat and the superconducting coil to block heat transfer by convection and radiation in the internal space of the cryostat.

[0022] In addition, the cryostat is set to an internal temperature of 20 to 40 K suitable for the operating temperature of the superconducting coil, and the internal vacuum level is 10 -5 It may be maintained at [torr] or less.

[0023] The above cryostat cooling unit may include a refrigerant supply unit (121) that supplies a refrigerant to form a cryogenic environment; and a cooling plate (122) that receives the refrigerant and cools the superconducting coil.

[0024] The load cell may measure the strength of the force resulting from the electromagnetic force acting on the superconducting coil in a direction opposite to the rotation of the rotor and the displacement caused by the superconducting coil and the armature coil mounted on the stator corresponding to the rotor, which intersects with the superconducting coil.

[0025] The load cell may include a heater (131) using a heating wire to ensure a minimum operating temperature in the internal space of the cryostat; and a second laminated insulation material (132) to surround the heater and block heat transfer generated by the heater.

[0026] The load cell is installed between the straight portion of the superconducting coil and the inner surface of the cryostat within the internal space of the cryostat, and includes a first temperature sensor (133) installed at one end in contact with the superconducting coil and a second temperature sensor (134) installed at the other end in contact with the cryostat, and may determine the average of the sensing values ​​of the first temperature sensor and the second temperature sensor as the temperature measurement value.

[0027] The above control unit is a mathematical formula The torque generated in the superconducting coil may be calculated by applying the force intensity measured by the load cell above.

[0028] The above control unit may transmit information regarding the strength of the force or torque acting on the superconducting coil to an external monitoring server through a communication unit.

[0029] The above control unit may check the temperature measurement value and, if it is lower than the operating temperature of the load cell, control the heater to heat it to a temperature within a predetermined error range based on the operating temperature of the load cell.

[0030] The operating temperature of the above load cell may be such that the minimum operating temperature is 77K.

[0031] The control unit may maintain a cryogenic environment in the internal space of the cryostat by controlling the refrigerant supply unit in consideration of the thermal load resulting from the contact between the superconducting coil and the load cell.

[0033] In addition, a control method for a torque measuring device for a superconducting coil according to an embodiment of the present invention may include: (a) a step of checking a temperature measurement value of a load cell installed between a straight part of a superconducting coil and an inner surface of a cryostat in the internal space of a cryostat; (b) a step of comparing the temperature measurement value with the operating temperature of the load cell; (c) a step of measuring the strength of a force acting on the superconducting coil through the load cell according to the result of comparing the temperature measurement value with the operating temperature of the load cell; and (d) a step of measuring a torque generated in the superconducting coil using the strength of the force acting on the superconducting coil.

[0034] Step (c) above may be to measure the strength of the force acting on the superconducting coil when the temperature measurement is higher than the operating temperature of the load cell.

[0035] According to an embodiment, after step (b), the method may further include a step of controlling a heater to heat the load cell when the temperature measurement is lower than the operating temperature of the load cell.

[0036] According to an embodiment, prior to step (a), the method may further include the step of reaching the internal temperature of the cryostat to the operating temperature of the superconducting coil through refrigerant supply control to maintain a cryogenic environment in the internal space of the cryostat.

[0038] Additionally, a superconducting rotor according to an embodiment of the present invention comprises: a rotor having a plurality of superconducting coils (10) mounted in a circular rotor housing formed integrally with a rotating shaft and rotating together; and a stator having an armature coil that links opposite to the superconducting coils; and further comprises a torque measuring device for verifying mechanical characteristics for each of the plurality of superconducting coils, wherein the torque measuring device may include: a cryostat for forming a cryogenic environment of the superconducting coils in a modular structure; a cryostat cooling unit for cooling the internal space of the cryostat based on the operating temperature of the superconducting coils; a load cell for measuring the strength of the force acting on the superconducting coils by the rotation of the rotor; and a control unit for measuring the torque of the superconducting coils using the strength of the force measured by the load cell.

[0039] The torque measuring device may include a first laminated insulating material that forms a thermal barrier layer between the cryostat and the superconducting coil to block heat transfer by convection and radiation in the internal space of the cryostat. Effects of the invention

[0041] The present invention can verify the mechanical properties of a superconducting coil by measuring the torque generated in the superconducting coil using the strength of the force acting on the superconducting coil by rotor rotation.

[0042] In addition, the present invention prevents damage to the load cell due to the difference between the operating temperature (20-40K) of the superconducting coil and the operating temperature (77K) of the load cell in the cryostat's cryostat environment, thereby enabling accurate measurement of the strength of the force acting on the superconducting coil through the load cell even within the internal space of the cryostat.

[0043] In addition, the present invention can perform an evaluation of the influence of the force received by the superconducting coil when manufacturing a superconducting application device.

[0044] In addition, the present invention can easily measure the electromagnetic force and torque of a superconducting coil existing in a cryogenic environment.

[0045] In addition, the present invention can measure the torque of a superconducting coil under rated operating conditions corresponding to its capacity, rather than using an excessive measurement method at speeds above the rated speed, during a short-circuit test of a superconducting rotary machine.

[0046] In addition, the present invention can calculate direct losses and efficiency occurring in a superconducting coil. Brief explanation of the drawing

[0048] FIG. 1 is a drawing showing a superconducting rotary machine according to an embodiment of the present invention, FIG. 2 is a drawing showing a torque measuring device for a superconducting coil according to an embodiment of the present invention. FIG. 3 is a drawing showing the AA' cross-section of the torque measuring device of FIG. 2. FIG. 4 is a diagram showing a control method for a torque measuring device of a superconducting coil according to an embodiment of the present invention. Specific details for implementing the invention

[0049] Preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings. However, detailed descriptions of known functions or configurations that may obscure the essence of the present invention in the following description and the accompanying drawings are omitted. Additionally, it should be noted that identical components throughout the drawings are indicated by the same reference numerals whenever possible.

[0050] The terms and words used in the specification and claims described below should not be interpreted as being limited to their ordinary or dictionary meanings, but should be interpreted in a meaning and concept consistent with the technical spirit of the invention, based on the principle that the inventor can appropriately define terms to best describe his invention.

[0051] Therefore, the embodiments described in this specification and the configurations illustrated in the drawings are merely the most preferred embodiments of the present invention and do not represent all of the technical ideas of the present invention; thus, it should be understood that various equivalents and modifications that can replace them may exist at the time of filing this application.

[0052] In the attached drawings, some components are exaggerated, omitted, or schematically depicted, and the size of each component does not entirely reflect its actual size. The present invention is not limited by the relative sizes or spacing depicted in the attached drawings.

[0053] Throughout the specification, when a part is described as "comprising" a certain component, this means that, unless specifically stated otherwise, it does not exclude other components but may include additional components. Furthermore, when a part is described as "connected" to another part, this includes not only cases where they are "directly connected" but also cases where they are "electrically connected" with other elements interposed between them.

[0054] A singular expression includes a plural expression unless the context clearly indicates otherwise. Terms such as "include" or "have" 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.

[0055] Additionally, the term “part” as used in the specification refers to a hardware component, such as software, FPGA, or ASIC, and the “part” performs certain roles. However, the meaning of “part” is not limited to software or hardware. The “part” may be configured to reside in an addressable storage medium or configured to run on one or more processors. Thus, by example, the “part” includes components such as software components, object-oriented software components, class components, and task components, as well as processes, functions, attributes, procedures, subroutines, segments of program code, drivers, firmware, microcode, circuits, data, databases, data structures, tables, arrays, and variables. The functions provided within the components and “parts” may be combined into a smaller number of components and “parts” or further separated into additional components and “parts.”

[0056] Embodiments of the present invention are described below with reference to the attached drawings so that those skilled in the art can easily implement them. However, the present invention may be embodied in various different forms and is not limited to the embodiments described herein. Furthermore, in order to clearly explain the present invention in the drawings, parts unrelated to the explanation have been omitted, and similar parts throughout the specification are denoted by similar reference numerals.

[0057] Spatially relative terms such as "below," "beneath," "lower," "above," and "upper" may be used to facilitate the description of the relationship between one component and other components as illustrated in the drawings. Spatially relative terms should be understood as encompassing different orientations of components during use or operation, in addition to the orientations depicted in the drawings. For example, if a component depicted in a drawing is inverted, a component described as "below" or "beneath" of another component may be placed "above" of that component. Therefore, the exemplary term "below" may encompass both the lower and upper directions. Components may also be oriented in other directions, and accordingly, spatially relative terms may be interpreted according to the orientation.

[0058] Hereinafter, preferred embodiments of the present invention will be described with reference to the attached drawings.

[0059] FIG. 1 is a drawing showing a superconducting rotary machine according to an embodiment of the present invention, FIG. 2 is a drawing showing a torque measuring device for a superconducting coil according to an embodiment of the present invention, and FIG. 3 is a drawing showing a cross-section AA' of the torque measuring device of FIG. 2.

[0060] As illustrated in FIG. 1, a superconducting rotor (1) according to an embodiment of the present invention includes a rotor having a plurality of superconducting coils (10) mounted on a circular rotor housing (3) that is integrally formed on a rotation axis (2) and rotates together, and a stator having an armature coil (20) that links opposite to the superconducting coils (10).

[0061] Here, the superconducting coil (10) is a coil in which a superconducting wire (12) is wound on a racetrack-type bobbin (11) formed with a straight section and a curved section, and is a winding part that generates the main magnetic flux required for main operation, and the armature coil (20) is a winding part in which a coil is wound in a slot and cuts the magnetic flux to induce an electromotive force.

[0062] Here, the rotor includes a torque measuring device for the superconducting coils shown in FIG. 2 and FIG. 3 to check the mechanical properties for each of the multiple superconducting coils (10).

[0063] This superconducting rotor (1) can be applied to a wind turbine. That is, since the wind turbine must estimate the maximum output through torque control, it is very important to control the torque below the rated wind speed.

[0064] One superconducting coil (10) functions as one pole in the superconducting rotor (1). Therefore, since there is a gap between each superconducting coil (10), the torque measuring device can derive the torque by measuring the force received by the superconducting coil (10) using a load cell (130).

[0065] For reference, since the permanent magnet rotor is in the form where the permanent magnet is inserted into the rotor, it is not easy to derive torque by measuring the force received by one pole using a load cell (130).

[0066] Hereinafter, with reference to FIGS. 2 and FIGS. 3, we will examine in detail the torque measuring device of a superconducting coil.

[0067] As illustrated in FIGS. 2 and 3, a torque measuring device for a superconducting coil according to an embodiment of the present invention includes a cryostat (110) for forming a cryogenic environment of a superconducting coil (10) into a modular structure, a cryostat cooling unit (120) for cooling the internal space of the cryostat (110) based on the operating temperature of the superconducting coil (10), a load cell (130) for measuring the strength of a force acting in the opposite direction to the rotor rotation by linking the superconducting coil (10) and the armature coil (20) by rotor rotation, and a control unit (140) for measuring the torque of the superconducting coil (10) using the strength of the force measured by the load cell (130).

[0068] Specifically, the cryostat (110) maintains a cryogenic environment at the operating temperature of the superconducting coil (10). Accordingly, the cryostat (110) is set to an internal cooling temperature of 20 to 40 K, which corresponds to the operating temperature of the superconducting coil (10). At this time, it is preferable for the cryostat (110) to individually house the superconducting coil (10) inside in order to efficiently maintain the cryogenic environment.

[0069] In addition, the cryostat (110) has an internal vacuum of 10 to ensure the efficiency of conductive cooling. -5 A first multi-layer insulation (150) may be placed to minimize cooling loss by blocking heat transfer by convection and radiation in the internal space while maintaining [torr] or lower. In the top view of FIG. 2, the first multi-layer insulation (150) is not shown in the drawing but is placed between the superconducting coil (10) and the cryostat (110) to form a thermal barrier layer.

[0070] These cryostats (110) enable structural individual operation by modularizing the superconducting coil (10) in the superconducting rotor (1).

[0071] The coil module structure of the superconducting coil (10) and cryostat (110) provides a structure that allows for individual repair and replacement, and because the internal space is reduced to form a cryogenic environment of the superconducting coil (10), it facilitates the formation or maintenance of an internal vacuum, as well as facilitating the rapid attainment or maintenance of a desired cooling temperature.

[0072] And, a plurality of cryostats (110) are installed along the outer surface of a ring-shaped rotor housing (3), and each cryostat (110) is arranged adjacent to each other.

[0073] Next, the cryostat cooling unit (120) cools the internal space of the cryostat (110) to form a cryogenic environment.

[0074] The cryostat cooling unit (120) includes a refrigerant supply unit (121) that supplies a refrigerant (liquid helium, liquid nitrogen, etc.) to form a cryogenic environment, and a cooling plate (122) that receives the refrigerant and cools the superconducting coil (10).

[0075] Here, the cooling plate (122) can form a refrigerant circulation structure in which the refrigerant supplied from the refrigerant supply unit (121) is cooled through a flow path formed inside the refrigerant and then recirculated back to the refrigerant supply unit (121). At this time, the cooling plate (122), cooled through the refrigerant circulation, cools the superconducting coil (10) through heat transfer by conduction.

[0076] In addition, the first laminated insulation material (150) is a multilayer radiation shield that blocks heat transfer by convection or radiation from the cooling plate (122), thereby enabling the maximum efficiency of heat transfer by conduction when the cooling plate (122) cools the superconducting coil (10).

[0077] And, the cooling plate (122) is placed on the lower surface of the cryostat (110) and the superconducting coil (10) is placed on the cooling plate (122).

[0078] Next, the load cell (130) measures the strength of the force acting on the superconducting coil (10) in the opposite direction to the rotor rotation, as the superconducting coil (10) and the armature coil (20) are linked by the rotor rotation.

[0079] At this time, the rotor rotates in a direction perpendicular to the straight portion of the superconducting coil (10), and torque is generated in the superconducting coil (10) in a direction opposite to the rotation of the rotor.

[0080] That is, torque is generated by the interaction between the superconducting coil (10) and the armature coil (20) when the rotor rotates, and the load cell (130) measures the electromagnetic force acting on the superconducting coil (10) and the strength of the force due to the resulting displacement.

[0081] So, the load cell (130) is installed on the opposite side of where the rotor rotates, and is installed between the straight part of the superconducting coil (10) and the inner surface of the cryostat (110) in the internal space of the cryostat (110).

[0082] Such a load cell (130) can be constructed using an elastic body that changes proportionally to an external force and a strain gauge that electrically changes it.

[0083] Meanwhile, the load cell (130) has a minimum operating temperature of 77K. That is, since the internal cooling temperature of the cryostat (110) (i.e., 20 to 40K) is set based on the operating temperature of the superconducting coil (10), it may be difficult to accurately measure the strength of the force acting on the superconducting coil (10) when the load cell (130) is installed in the internal space of the cryostat (110).

[0084] So, the load cell (130) applies a heater (131) using a heating wire to ensure the lowest operating temperature in the internal space of the cryostat (110).

[0085] At this time, the load cell (130) wraps a second laminated insulation material (132) that blocks heat transfer generated by the heater (131) in order to minimize the heat load caused by the heater (131).

[0086] Additionally, the load cell (130) has first and second temperature sensors (133, 134) installed at both ends to measure its own temperature, and determines the average of the sensing values ​​at both ends as the temperature measurement value. Here, the first temperature sensor (133) is placed at one end of the load cell (130) that is in contact with the superconducting coil (10), and the second temperature sensor (134) is installed at the other end of the load cell (130) that is in contact with the cryostat (110).

[0087] That is, since the temperature of the load cell (130) is lowered by the conduction of the superconducting coil (10), there is a temperature difference at both ends. Accordingly, the temperature measurement value of the load cell (130) can be defined as the average of the sensing values ​​at both ends obtained through the first temperature sensor (133) as well as the second temperature sensor (134).

[0088] The temperature measurement of such a load cell (130) can be considered to correspond to the temperature at the center point of the load cell (130). Additionally, the temperature measurement of such a load cell (130) can be predicted by interpolating the temperature of each section of the load cell (130) according to the physical properties.

[0089] Next, the control unit (140) measures the torque of the superconducting coil (10) using the force intensity measured by the load cell (130). That is, the control unit (140) calculates the torque generated in the superconducting coil (10) using the force intensity acting on the superconducting coil (10) by the load cell (130).

[0090] Torque is converted as shown in Equation 1 below.

[0091]

[0093] This torque can be used to calculate the efficiency of the superconducting rotor (1) once the rotor's rotational speed, output voltage value, and output current value are confirmed.

[0094] In addition, since the control unit (140) can utilize the strength of the force or torque acting on the superconducting coil (10) as a basis for determining the mechanical stability of the superconducting coil (10), it can transmit information on the strength of the force or torque acting on the superconducting coil (10) to an external monitoring server (not shown) through the communication unit (170).

[0095] At this time, the control unit (140) can identify each superconducting coil (10) for determining mechanical stability by transmitting the coil identifier for each superconducting coil (10) together to an external monitoring server.

[0096] Additionally, the control unit (140) checks the temperature measurement value of the load cell (130) and, if it is lower than the operating temperature of the load cell (130) (i.e., 77K), controls the heater (131) to heat the load cell (130) to a temperature within a predetermined error range based on the operating temperature of the load cell (130).

[0097] In this way, the control unit (140) first reaches the operating temperature of the superconducting coil (10), and then continuously checks the temperature measurement value of the load cell (130) to continuously maintain the operating temperature of the load cell (130).

[0098] And, the control unit (140) controls the refrigerant supply unit (121) of the cryostat cooling unit (120) to maintain a cryogenic environment in the internal space of the cryostat (110).

[0099] Here, since the internal space of the cryostat (110) is in a vacuum state, there is almost no molecular convection, and the superconducting coil (10) and the load cell (130) have almost no heat exchange due to the laminated insulation. That is, in the internal vacuum state of the cryostat (110), it is difficult to expect heat exchange between the superconducting coil (10) and the load cell (130) by convection or radiation through the double thermal insulation of the first laminated insulation (150) (132).

[0100] However, the control unit (140) controls the supply of refrigerant from the refrigerant supply unit (121) by taking into account the thermal load caused by the contact between the superconducting coil (10) and the load cell (130).

[0101] Additionally, the control unit (140) includes a memory for storing one or more processors and computer-readable instructions.

[0102] This control unit (140) performs a control method for a torque measuring device of a superconducting coil according to an embodiment of the present invention when computer-readable commands stored in memory are executed by at least one processor.

[0103] Here, the processor is at least one processor and may also be referred to as a controller, microcontroller, microprocessor, microcomputer, etc. Furthermore, the processor may be implemented by hardware, firmware, software, or a combination thereof.

[0104] In addition, memory may be a single storage device or a collective term for multiple storage elements. Computer-readable instructions stored in memory may be executable program code or parameters, data, etc. And, memory may include Random Access Memory (RAM) or Non-Volatile Memory (NVRAM), such as magnetic disk storage or flash memory.

[0105] Hereinafter, a control method for a torque measuring device of a superconducting coil according to an embodiment of the present invention will be described with reference to FIG. 4.

[0107] FIG. 4 is a diagram showing a control method for a torque measuring device of a superconducting coil according to an embodiment of the present invention.

[0108] Referring to FIG. 4, the control unit (140) raises the internal temperature of the cryostat (110) to the operating temperature of the superconducting coil (10) through refrigerant supply control to maintain a cryogenic environment in the internal space of the cryostat (110) (S201).

[0109] Afterwards, the control unit (140) checks the temperature measurement value of the load cell (130) (S202), and if the temperature measurement value of the load cell (130) is lower than the operating temperature of the load cell (130), it controls the heater (131) to heat the load cell (130) (S203, S204).

[0110] Here, the load cell (130) is installed on the opposite side of where the rotor rotates, and is installed between the straight part of the superconducting coil (10) and the inner surface of the cryostat (110) in the internal space of the cryostat (110).

[0111] On the other hand, when the temperature measurement value of the load cell (130) is higher than the operating temperature of the load cell (130), the control unit (140) measures the strength of the force acting on the superconducting coil (10) through the load cell (130) (S203, S205).

[0112] Afterwards, the control unit (140) measures the torque generated in the superconducting coil (10) using the strength of the force acting on the superconducting coil (10) (S206).

[0113] A method according to some embodiments may be implemented in the form of program instructions that can be executed through various computer means and recorded on a computer-readable medium. The computer-readable medium may include program instructions, data files, data structures, etc., either alone or in combination. The program instructions recorded on the medium may be those specifically designed and configured for the present invention, or they may be those known and available to those skilled in the art of computer software. Examples of computer-readable recording media include magnetic media such as hard disks, floppy disks, and magnetic tapes; optical recording media such as CD-ROMs and DVDs; magneto-optical media such as floptical disks; and hardware devices specifically configured to store and execute program instructions, such as ROM, RAM, and flash memory. Examples of program instructions include machine code, such as that generated by a compiler, as well as high-level language code that can be executed by a computer using an interpreter, etc.

[0114] Although the foregoing description has focused on the novel features of the invention applicable to various embodiments, those skilled in the art will understand that various deletions, substitutions, and modifications are possible in the forms and details of the apparatus and method described above without departing from the scope of the invention. Accordingly, the scope of the invention is defined by the appended claims rather than by the foregoing description. All variations within the equivalent scope of the claims are encompassed within the scope of the invention. Explanation of the symbols

[0116] 10 ; Superconducting coil 11 ; Bobbin 12 ; Superconducting wire 20 ; Armature coil 110 ; Cryostat 120 ; Cryostat cooling unit 121 ; Refrigerant supply unit 122 ; Cooling plate 130 ; Load cell 131 ; Heater 132 ; 2nd laminated insulation 133 ; 1st temperature sensor 134 ; 2nd temperature sensor 140 ; ​​Control unit 150 ; 1st laminated insulation 160 ; support plate 170 ; Communications Department

Claims

Claim 1 A cryostat (110) for forming a cryogenic environment of a superconducting coil (10) into a modular structure; a cryostat cooling unit (120) for cooling the internal space of the cryostat (110) based on the operating temperature of the superconducting coil (10); and a load cell (130) for measuring the strength of the force acting on the superconducting coil (10) by rotor rotation; The control unit (140) for measuring the torque of the superconducting coil (10) using the force intensity measured by the load cell (130); wherein the cryogenic environment is maintained at the operating temperature of the superconducting coil (10); and the control unit (140) determines the average of the sensing values ​​of a first temperature sensor (133) installed at one end of the load cell (130) in contact with the superconducting coil (10) and a second temperature sensor (134) installed at the other end of the load cell (130) in contact with the cryostat (110) as the temperature measurement value, and checks the temperature measurement value; if it is lower than the operating temperature of the load cell (130), heats it to a temperature within a predetermined error range based on the operating temperature of the load cell (130), and if the temperature measurement value is higher than the operating temperature of the load cell (130), measures the force intensity acting on the superconducting coil (10). A torque measuring device for a superconducting coil characterized by measuring the torque generated in the superconducting coil (10) using the strength of the above force. Claim 2 In claim 1, the cryostat is a torque measuring device for a superconducting coil that individually houses the superconducting coil inside. Claim 3 A torque measuring device for a superconducting coil, further comprising: a first laminated insulating material (150) that forms a thermal barrier layer between the cryostat and the superconducting coil to block heat transfer by convection and radiation in the internal space of the cryostat, in the second claim. Claim 4 In claim 3, the cryostat is set to an internal temperature of 20 to 40 K, corresponding to the operating temperature of the superconducting coil, and the internal vacuum is 10 -5 A torque measuring device for a superconducting coil that is maintained at [torr] or less. Claim 5 A torque measuring device for a superconducting coil according to claim 1, wherein the cryostat cooling unit comprises: a refrigerant supply unit (121) for supplying a refrigerant to form the cryogenic environment; and a cooling plate (122) for receiving the refrigerant and cooling the superconducting coil. Claim 6 A torque measuring device for a superconducting coil according to claim 1, wherein the load cell measures the strength of the force resulting from the displacement and the electromagnetic force acting on the superconducting coil in a direction opposite to the rotation of the rotor by linking the superconducting coil and the armature coil mounted on the stator corresponding to the rotor. Claim 7 A torque measuring device for a superconducting coil according to claim 1, wherein the load cell comprises: a heater (131) using a heating wire to ensure a minimum operating temperature in the internal space of the cryostat; and a second laminated insulating material (132) to surround the heater and block heat transfer generated by the heater. Claim 8 A torque measuring device for a superconducting coil according to claim 7, wherein the load cell is installed between the straight portion of the superconducting coil and the inner surface of the cryostat within the internal space of the cryostat. Claim 9 In claim 1, the control unit is a mathematical formula A torque measuring device for a superconducting coil that calculates the torque generated in the superconducting coil by applying the force intensity measured by the load cell. Claim 10 A torque measuring device for a superconducting coil according to claim 9, wherein the control unit transmits information on the strength of the force or torque acting on the superconducting coil to an external monitoring server through a communication unit. Claim 11 delete Claim 12 A torque measuring device for a superconducting coil according to claim 1, wherein the operating temperature of the load cell is such that the minimum operating temperature is 77K. Claim 13 A torque measuring device for a superconducting coil that maintains the cryogenic environment in the internal space of the cryostat by controlling the refrigerant supply unit in consideration of the thermal load resulting from the contact between the superconducting coil and the load cell in claim 5. Claim 14 A method for controlling a torque measuring device for a superconducting coil, comprising: (a) a step of checking a temperature measurement value of a load cell installed between a linear portion of the superconducting coil and an inner surface of the cryostat within the internal space of the cryostat; (b) a step of comparing the temperature measurement value with the operating temperature of the load cell; (c) a step of measuring the strength of a force acting on the superconducting coil through the load cell according to the result of comparing the temperature measurement value with the operating temperature of the load cell; and (d) a step of measuring a torque generated in the superconducting coil using the strength of the force acting on the superconducting coil. A control method for a torque measuring device of a superconducting coil, comprising: (c) determining the average of the sensing values ​​of a first temperature sensor installed at one end of the load cell in contact with the superconducting coil and a second temperature sensor installed at the other end of the load cell in contact with the cryostat as the temperature measurement value; measuring the strength of the force acting on the superconducting coil when the temperature measurement value is higher than the operating temperature of the load cell; and controlling a heater to heat the superconducting coil to a temperature within a predetermined error range based on the operating temperature of the load cell when the temperature measurement value is lower than the operating temperature of the load cell. Claim 15 delete Claim 16 delete Claim 17 A method for controlling a torque measuring device of a superconducting coil according to claim 14, further comprising, prior to step (a), a step of reaching the internal temperature of the cryostat to the operating temperature of the superconducting coil through refrigerant supply control to maintain a cryogenic environment in the internal space of the cryostat, wherein the cryogenic environment is maintained at the operating temperature of the superconducting coil. Claim 18 A rotor having a plurality of superconducting coils (10) mounted in a circular rotor housing formed integrally with a rotation axis and rotating together; and a stator having an armature coil linked opposite to the superconducting coils; and further comprising a torque measuring device for verifying mechanical characteristics for each of the plurality of superconducting coils (10), wherein the torque measuring device comprises: a cryostat (110) for forming a cryogenic environment of the superconducting coils (10) in a modular structure; a cryostat cooling unit (120) for cooling the internal space of the cryostat (110) based on the operating temperature of the superconducting coils (10); a load cell (130) for measuring the strength of the force acting on the superconducting coils (10) by the rotation of the rotor; and a control unit (140) for measuring the torque of the superconducting coils (10) using the strength of the force measured by the load cell (130). A superconducting rotating machine characterized by including, wherein the cryogenic environment is maintained at the operating temperature of the superconducting coil (10), and the control unit (140) determines the average of the sensing values ​​of a first temperature sensor (133) installed at one end of the load cell (130) in contact with the superconducting coil (10) and a second temperature sensor (134) installed at the other end of the load cell (130) in contact with the cryostat (110) as the temperature measurement value, and if the temperature measurement value is lower than the operating temperature of the load cell (130), heating to a temperature within a predetermined error range based on the operating temperature of the load cell (130), and if the temperature measurement value is higher than the operating temperature of the load cell (130), measuring the strength of the force acting on the superconducting coil (10) and measuring the torque generated in the superconducting coil (10) using the strength of the force. Claim 19 In claim 18, the torque measuring device comprises a first laminated insulating material forming a thermal barrier layer between the cryostat and the superconducting coil to block heat transfer by convection and radiation in the internal space of the cryostat; a superconducting rotating machine. Claim 20 In claim 18, the superconducting rotator comprises: a load cell, a heater using a heating wire to ensure a minimum operating temperature in the internal space of the cryostat; and a second laminated insulating material to surround the heater and block heat transfer generated by the heater. Claim 21 In claim 20, the load cell is installed between the straight portion of the superconducting coil and the inner surface of the cryostat within the internal space of the cryostat, in a superconducting rotor. Claim 22 In claim 18, the control unit is a mathematical formula A superconducting rotary machine that calculates the torque generated in the superconducting coil by applying the force intensity measured by the load cell.

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