Rotating electric machine inspection device and rotating electric machine inspection method

Abstract

The invention comprises an input unit (227), a relationship storage unit (228), a measuring unit (20), an estimating unit (229) and a judging unit (230), wherein the input unit inputs the shape of the inspection target surface (50) of the slot wedge (34) exposed from the slot (33) in a state where no force is applied to the slot wedge (34), the relationship storage unit acquires and stores the relationship between the reaction force of the spring (35) in the inspection target surface (50) of the slot wedge (34) and the deformation distribution of the shape of the inspection target surface (50) of the slot wedge (34) input to the input unit (227) as a deformation reaction force relationship, the measuring unit measures the measured deformation distribution of the inspection target surface (50) of the slot wedge (34), the estimating unit estimates the estimated reaction force from the measured deformation distribution and the deformation reaction force relationship, and the judging unit judges whether the looseness of the slot wedge (34) is good or bad based on the estimated reaction force.

Description

Technical Field

[0001] The present application relates to an inspection device for a rotating electric machine and an inspection method for a rotating electric machine. Background Art

[0002] The coil holding structure of the stator of a rotating electric machine is composed of a slot wedge that contacts the stator core as a coil anti-dropping member and a corrugated spring provided between the slot wedge and the coil. The corrugated spring is provided to prevent the coil from vibrating due to the electromagnetic excitation force generated on the coil during the operation of the rotating electric machine, and is assembled in a shape that is bent to generate a certain holding force. In this holding structure, due to the long-term dimensional change of the resin material such as the main insulation part of the coil, the deflection of the corrugated spring is reduced, and the holding force is reduced. For this reason, the reduction in the holding force of the corrugated spring is monitored by regularly checking the looseness of the slot wedge.

[0003] As a method for detecting the looseness of the stator slot wedge caused by the reduction of the holding force of the corrugated spring, there is a method of measuring the reaction force of the spring by regular inspection and monitoring the reduction amount of the reaction force. For example, as shown in Patent Document 1, a corrugated coil fixing member made of an elastic body is arranged on the stator coil, a slot wedge provided with a monitoring slit is arranged corresponding to the maximum wave height portion of the coil fixing member, and a sensor part of an optical displacement detector is arranged at a position of the rotor facing the monitoring slit of the slot wedge, so that the spring pressure signal of the coil fixing member in operation can be always monitored.

[0004] Prior Art Literature

[0005] Patent Literature

[0006] Patent Document 1: Japanese Patent Application Laid-Open No. 01-298929 Summary of the invention

[0007] Problems to be solved by the invention

[0008] Conventional inspection devices and methods for inspecting rotating electrical machines change the slot wedge or its supporting structure and provide a sensor for detecting looseness, which may reduce the strength of the slot wedge or its supporting structure.

[0009] The present application discloses an invention for solving the above-mentioned problems, and an object of the present application is to provide an inspection device and an inspection method for a rotating electrical machine that can perform inspection without requiring structural changes or adding steps.

[0010] Solutions to Solve Problems

[0011] The present application discloses an inspection device for a rotating electric machine, which inspects a rotating electric machine. The rotating electric machine includes a stator and a rotor. The stator includes a slot wedge, which fixes a winding arranged in a slot formed on the inner side of a ring-shaped iron core in the radial direction via a spring or with a spring function. The rotor is arranged on the inner side of the stator in the radial direction at a predetermined interval, wherein:

[0012] The above-mentioned inspection device for a rotating electrical machine comprises an input unit, a relationship storage unit, a measuring unit, an estimating unit and a determining unit.

[0013] The input unit inputs a shape of the inspection target surface of the slot wedge exposed from the slot in a state where no force is applied to the slot wedge.

[0014] The relationship storage unit acquires and stores, as a deformation reaction force relationship, a relationship between the reaction force of the spring or the slot wedge in the inspection target surface of the slot wedge and a deformation distribution of the shape of the inspection target surface of the slot wedge input to the input unit.

[0015] The measuring unit measures the measured deformation distribution of the inspection target surface of the slot wedge.

[0016] The estimating unit estimates the estimated reaction force from the measured deformation distribution and the deformation reaction force relationship.

[0017] The determination unit determines whether the loosening of the wedge is good or bad based on the estimated reaction force.

[0018] In addition, the present application discloses a method for inspecting a rotating electric machine, wherein the rotating electric machine includes a stator and a rotor, wherein the stator includes slot wedges that fix windings arranged in slots formed on the inner side in the radial direction of an annular iron core via springs or with a spring function, and the rotor is arranged on the inner side in the radial direction of the stator at a predetermined interval, wherein:

[0019] The above-mentioned inspection method of a rotating electrical machine comprises an input step, a relationship storage step, a measurement step and an estimation step.

[0020] In the input step, the shape of the inspection target surface of the slot wedge exposed from the slot in a state where no force is applied to the slot wedge is input,

[0021] In the relationship storing step, a relationship between the reaction force of the spring or the slot wedge in the inspection target surface of the slot wedge and the deformation distribution of the shape of the inspection target surface of the slot wedge input in the input step is obtained and stored as a deformation reaction force relationship.

[0022] In the measuring step, the measured deformation distribution of the inspection target surface of the slot wedge is measured.

[0023] In the estimating step, the estimated reaction force is estimated from the measured deformation distribution and the deformation-reaction force relationship.

[0024] Effects of the Invention

[0025] According to the inspection device and the inspection method of a rotating electric machine disclosed in the present application, inspection can be performed without changing the structure or adding steps. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 This is a schematic diagram showing the configuration of a rotating electrical machine and a rotating electrical machine inspection device according to the first embodiment.

[0027] Figure 2 Yes means Figure 1 Schematic diagram of the structure of a cross section of a stator core perpendicular to the axial direction shown.

[0028] Figure 3 Yes means Figure 2 Schematic diagram of the structure of a cross section of the stator core taken along line TT perpendicular to the circumferential direction shown.

[0029] Figure 4 Yes means Figure 2 Schematic diagram of the structure of a cross section of the groove perpendicular to the axial direction shown.

[0030] Figure 5 Yes means Figure 4 A three-dimensional view of the structure inside the tank is shown.

[0031] Fig. 6A Yes means Figure 5 A top view of the structure of the slot wedge within the slot is shown.

[0032] Figure 6B Yes means Figure 5 A cross-sectional view of the structure of a slot wedge within a slot is shown.

[0033] Figure 7 Yes means Figure 1 A block diagram of the structure of an inspection device for a rotating electrical machine is shown.

[0034] Figure 8 Yes means Figure 7 A flowchart of an inspection method of an inspection device for an electric rotating machine is shown.

[0035] Fig. 9 Yes means Figure 7 A flowchart of an inspection method of an inspection device for an electric rotating machine is shown.

[0036] Fig.10 Yes means Figure 7A flowchart of an inspection method of an inspection device for an electric rotating machine is shown.

[0037] Fig.11A Yes means Figure 4 A diagram showing the structure of the slot wedges, springs, and stator core in the slot.

[0038] Fig. 11B Yes Fig.11A The structure shown is modeled in the figure.

[0039] Fig. 11C Yes means Fig.11A FIG. 1 is a graph showing the relationship between the measurement position and the deformation amount on the inspection target surface of the slot wedge.

[0040] Fig.11D This is an equation that represents the relationship between the deformation and reaction force in the first embodiment.

[0041] Fig. 12A Yes means Figure 4 A diagram showing the structure of the slot wedges, springs, and stator core in the slot.

[0042] Fig. 12B Yes Fig. 12A The structure shown is modeled in the figure.

[0043] Fig. 12C Yes means Fig. 12A FIG. 1 is a graph showing the relationship between the measurement position and the deformation amount on the inspection target surface of the slot wedge.

[0044] Fig.13 This is a block diagram showing the configuration of the inspection device for the rotating electrical machine in the first embodiment.

[0045] Fig.14 This is a flowchart showing an inspection method of the inspection device for a rotating electrical machine in the second embodiment.

[0046] Fig.15A Yes means Figure 4 A diagram showing the structure of the slot wedges, springs, and stator core in the slot.

[0047] Fig. 15B Yes Fig.15A The structure shown is modeled in the figure.

[0048] Fig. 15C Yes means Fig.15A FIG. 1 is a graph showing the relationship between the measurement position and the deformation amount on the inspection target surface of the slot wedge.

[0049] Fig.15D This is an equation that represents the relationship between the deformation and reaction force in the second embodiment.

[0050] Fig.16This is a flowchart showing an inspection method of the inspection device for a rotating electrical machine in the third embodiment.

[0051] Fig.17A Yes means Figure 4 A diagram showing the structure of the slot wedges, springs, and stator core in the slot.

[0052] Fig. 17B Yes Fig.17A The structure shown is modeled in the figure.

[0053] Fig. 17C Yes means Fig.17A FIG. 1 is a graph showing the relationship between the measurement position and the deformation amount on the inspection target surface of the slot wedge.

[0054] Fig.17D This is an equation that represents the relationship between the deformation and reaction force in the third embodiment.

[0055] Fig.18 This is a flowchart showing an inspection method of the inspection device for a rotating electrical machine in the fourth embodiment.

[0056] Fig.19A Yes means Figure 4 A diagram showing the structure of the slot wedges, springs, and stator core in the slot.

[0057] Fig.19B Yes Fig.19A The structure shown is modeled in the figure.

[0058] Fig.19C Yes means Fig.19A FIG. 1 is a graph showing the relationship between the measurement position and the deformation amount on the inspection target surface of the slot wedge.

[0059] Fig.19D This is an equation that represents the relationship between the deformation and reaction force in the fourth embodiment.

[0060] Fig. 20 This is a flowchart showing an inspection method of the inspection device for a rotating electrical machine in the fifth embodiment. DETAILED DESCRIPTION

[0061] In the following description, the directions in the rotating electrical machine 100 are represented as the circumferential direction X, the axial direction Z, the radial direction Y, the outer side YO of the radial direction Y, and the inner side YI of the radial direction Y. Therefore, in other parts of the rotating electrical machine 100, such as the stator 3 and the rotor 4, these directions are also used as references to represent the directions and to describe them. In addition, the rotating electrical machine 100 to be inspected represents an example of a turbine generator that obtains a rotational force from a turbine as a prime mover. In addition, the inspection target surface 50 of the stator 3 refers to the inspection target surface 50 of the slot wedge 34. In addition, as the deformation of the inspection target surface 50, the deformation is mainly described as an example. In addition, as a method for measuring the deformation, the digital image correlation method is described as an example. In addition, the cases of other examples are described as appropriate.

[0062] Implementation method 1.

[0063] Figure 1 This is a schematic diagram showing the configuration of the rotating electrical machine inspection device and the rotating electrical machine to be inspected according to the first embodiment. Figure 2 Yes means Figure 1 Schematic diagram of a cross section perpendicular to the axial direction Z of a stator core (hereinafter referred to as core) of a rotating electric machine shown. Figure 2 represents the slot in the core, where the direction of the structure in the slot is represented by a cylindrical coordinate system. Figure 3 Yes means Figure 1 The iron core of the rotating electrical machine shown is perpendicular to the circumferential direction X ( Figure 2 Schematic diagram of a cross section taken along the TT line in FIG.

[0064] Figure 4 Yes means Figure 2 Schematic diagram of the structure of a cross section of the groove perpendicular to the axial direction shown. Figure 5 Yes means Figure 4 A three-dimensional view of the structure inside the tank is shown. Fig. 6A and Figure 6B is a diagram showing the structure of a slot wedge in a slot, Fig. 6A is a top view showing the structure of the slot wedge, Figure 6B It is a cross-sectional view showing the structure of a slot wedge. Figure 7 Yes means Figure 1 A block diagram of the structure of an inspection device for a rotating electrical machine is shown. Figures 8 to 10 Yes means Figure 7 A flowchart of an inspection method of an inspection device for an electric rotating machine is shown.

[0065] Figure 1In the embodiment, the rotating electric machine 100 includes a frame 1, a gas cooler 2 housed in the frame 1, a stator 3, and a rotor 4. A refrigerant such as cooling gas for removing heat generated by power generation circulates in the frame 1, and the gas cooler 2 cools the refrigerant. The stator 3 includes a stator core 31 (hereinafter referred to as the core 31) and a winding 36. The core 31 has a cylindrical shape and is fixedly disposed in the frame 1.

[0066] like Figure 2 As shown in FIG. 1 , a plurality of slots 33 are formed on the outer side YO of the core 31 in the radial direction Y. The winding 36 is accommodated in each slot 33 of the core 31. Figure 4 as well as Figure 5 As shown, slot wedges 34 are provided on the windings 36 in each slot 33 via springs 35. Figure 3 As shown, a plurality of slot wedges 34 are provided in each slot 33 in the axial direction Z. The slot wedges 34 are installed so that the winding 36 serving as a structure in the slot 33 of the core 31 does not fall out.

[0067] like Figure 1 As shown, a part of the winding 36 is pulled out from both ends of the core 31 in the axial direction Z to form coil ends 32A. One of the coil ends 32A at both ends in the axial direction Z is connected to a main conductor (not shown) extending to the outside of the frame 1. The electric power generated by the rotating electric machine 100 is taken out to the outside through the main conductor.

[0068] The rotor 4 has a pair of rotating shafts 41, a rotor core 42, and retaining rings 43A and 43B. The rotor 4 is arranged at a predetermined interval on the outer side YO of the stator 3 in the radial direction Y. The pair of rotating shafts 41 are arranged to sandwich the rotor core 42. The axis centers of the pair of rotating shafts 41 and the axis center of the rotor core 42 coincide with each other. The axial direction Z parallel to the axis centers of the pair of rotating shafts 41 and the rotor core 42 is the same as the axial direction Z of the rotating electrical machine 100. In addition, the radial direction Y centered on the axis centers of the pair of rotating shafts 41 and the rotor core 42 is the same as the radial direction Y of the rotating electrical machine 100. In addition, the circumferential direction X centered on the axis centers of the pair of rotating shafts 41 and the rotor core 42 is the same as the circumferential direction X of the rotating electrical machine 100.

[0069] A pair of rotating shafts 41 are rotatably supported by bearings provided on the frame 1. The rotor 4 rotates relative to the stator 3 by a prime mover (a turbine in this example) not shown. The iron core 31 and the winding 36 are located on the outer side YO of the radial direction Y of the rotor core 42, and current is generated in the winding 36 by receiving the magnetic flux generated by the rotor core 42. The retaining rings 43A and 43B are respectively mounted on one end and the other end of the axial direction Z of the rotor core 42, and are respectively exposed outside the iron core 31.

[0070] like Figure 1 , Figure 7As shown, the inspection device 220 (hereinafter referred to as the inspection device 220) of the rotating electrical machine 100 is connected to the photographing devices 210A, 210B, the driving devices 211A, 211B, and the display device 240. The photographing devices 210A, 210B are arranged in the frame 1 of the rotating electrical machine 100. The photographing devices 210A, 210B photograph the slot wedge 34 having the inspection target surface 50, generate image data of the inspection target surface 50, and transmit the generated image data to the inspection device 220.

[0071] The driving devices 211A and 211B move the photographing devices 210A and 210B in the axial direction Z in the space between the rotor core 42 and the iron core 31 in the radial direction Y in the frame 1. Thus, the slot wedge 34 having the inspection target surface 50 can be photographed without disassembling the rotor 4 of the rotating electrical machine 100, and the inspection period can be shortened. The photographing device 210A is disposed on the outer side YO of the iron core 31 in the radial direction Y, and photographs the iron core 31 while being moved in the axial direction Z by the driving device 211A. The photographing device 210B is disposed on the outer side YO of the iron core 31 in the radial direction Y, and photographs the iron core 31 while being moved in the axial direction Z by the driving device 211B.

[0072] The photographing devices 210A and 210B photograph the core 31 in a specific initial period and transmit the generated image data as initial image data to the inspection device 220. The initial period refers to, for example, before the slot wedge 34 is mounted on the core 31, that is, a period in which no force is applied to the slot wedge 34.

[0073] After the rotating electrical machine 100 starts to operate, the photographing devices 210A and 210B photograph the iron core 31 during a predetermined inspection period, and the generated image data is transmitted as inspection image data to the inspection device 220. The inspection period may be, for example, a period determined to arrive at a certain period after the rotating electrical machine 100 starts to operate, or a period determined so that the interval of the inspection period gradually shortens as the elapsed time after the rotating electrical machine 100 starts to operate, or a period determined based on the actual operating time of the rotating electrical machine 100 rather than simply the elapsed time, or a period determined based on the temperature or humidity in the frame 1 because the deterioration rate of the iron core 31 differs depending on the temperature or humidity in the frame 1.

[0074] The inspection device 220 generates a change in the distribution of deformation on the inspection object surface 50 as a deformation distribution using a digital image correlation method based on the inspection image data generated by the imaging devices 210A and 210B. The digital image correlation method is a method in which the inspection object surface 50 is photographed before and after the inspection object surface 50 is deformed, and the displacement amount and displacement direction on the inspection object surface 50 are simultaneously obtained from the brightness distribution of the obtained digital image data. In addition, the deformation distribution of the deformation includes the displacement amount and displacement direction on the inspection object surface 50. The display device 240 displays various information generated by the inspection device 220.

[0075] Figure 4 3 is a schematic diagram showing a cross section of the slot 33 perpendicular to the axial direction Z. A winding 36 for outputting current is provided in the slot 33. The winding 36 vibrates due to the electromagnetic excitation force generated by the current flowing in the winding 36. Therefore, in order to prevent the winding 36 from moving due to the vibration, a spring 35 and a slot wedge 34 of a retaining member are provided in the slot 33. The winding 36 is composed of a conductor 37 and an insulating portion 38. The insulating portion 38 is formed of a resin material. Figure 5 3 is a perspective view of the slot 33. The spring 35 is undulating in the axial direction Z. When the slot wedge 34 is assembled, the spring 35 is flattened and assembled together, and the winding 36 is held by the reaction force from the iron core 31.

[0076] Fig. 6A and Figure 6B Schematic diagram of slot wedge 34. A random pattern is applied to the portion of slot wedge 34 on the rotor 42 side of rotating electric machine 100, except for the portion that contacts iron core 31 and cannot be seen from the rotor 42 side of rotating electric machine 100, to form inspection target surface 50. The random pattern is formed on the entire surface of inspection target surface 50 in circumferential direction X and axial direction Z. The random pattern may be formed by pasting a sheet with a pattern instead of by coating. The random pattern may also be formed on Figure 3 All slot wedges 34 in the core 31 are shown. By forming a random pattern on the inspection target surface 50, the deformation of the slot wedge 34 varies greatly, and can be easily photographed by the photographing devices 210A and 210B. In addition, by forming a pattern randomly like a random pattern, the accuracy of measuring the deformation is improved, and the direction of the deformation to be measured can be freely determined.

[0077] Figure 7 2 is a block diagram showing the functional structure of the inspection device 220. Figure 7 As shown, the inspection device 220 includes a control unit 221, an acquisition unit 222, a first storage unit 223, a generation unit 224, an inspection unit 225, a second storage unit 226, an input unit 227, a relationship storage unit 228, an estimation unit 229, a determination unit 230, a decision unit 231 and a measurement unit 20.

[0078] The control unit 221 controls the imaging devices 210A, 210B and the driving devices 211A, 211B so as to image the inspection target surface 50 during the initial period and the preset inspection period. The acquisition unit 222 acquires the initial image data and the subsequent inspection image data transmitted from the imaging devices 210A, 220B, and outputs each image data to the first storage unit 223 and the generation unit 224.

[0079] The first storage unit 223 stores the initial image data and the inspection image data provided by the acquisition unit 222. The generation unit 224 generates a deformation distribution of the deformation of the wedge 34 using a digital image correlation method based on the inspection image data provided by the acquisition unit 222 and the initial image data and the inspection image data stored in the first storage unit 223, and outputs it to the inspection unit 225.

[0080] Specifically, the generating unit 224 compares the initial image data stored in the first storage unit 223 and the inspection image data provided by the acquiring unit 222, and based on the difference, generates a deformation deformation distribution representing the change in the distribution of the deformation of the inspection object surface 50 from before the deformation change occurs to the current moment.

[0081] In addition, the generator 224 may also compare the inspection image data of the previous inspection period stored in the first storage unit 223 and the inspection image data of the current inspection period provided by the acquisition unit 222 every time the inspection period arrives, and generate a deformation distribution indicating the change in the distribution of the deformation of the inspection object surface 50 during the period from the previous inspection period to the current inspection period (hereinafter referred to as the operation period) based on the difference. In this case, the degree of change in the distribution of the deformation during each operation period (hereinafter referred to as the deformation change degree) can be obtained based on the deformation distribution during each inspection period.

[0082] In addition, the abnormality of the slot wedge 34 can also be determined based on the deformation change degree. For example, when the difference between the deformation change degree during the previous operation and the deformation change degree during the current operation exceeds a predetermined value, it can be determined that an abnormality has occurred in the slot wedge 34 and the operator is notified. In addition, the inspection device 220 can also store the deformation distribution generated during each inspection period, and perform abnormality determination based on the comparison of multiple deformation distributions during multiple inspection periods.

[0083] The second storage unit 226 stores the shape information of the rotating electric machine 100 to be inspected and the trend information indicating the trend of the deformation distribution of the inspection target surface 50 when the slot wedge 34 is loosened from the reference when the slot wedge 34 is assembled. The trend information indicates the correspondence between the amount of looseness generated in the slot wedge 34 and the deformation distribution of the deformation in the slot wedge 34, and is generated based on actual measurement or simulation. The inspection unit 225 outputs the measurement result of the inspection target surface 50 of the slot wedge 34 determined as not having measurement abnormality based on the deformation distribution of the deformation given by the generation unit 224 and the trend information stored in the second storage unit 226 to the estimation unit 229. Therefore, the measurement unit 20 includes the acquisition unit 222, the generation unit 224, the inspection unit 225, the first storage unit 223, and the second storage unit 226.

[0084] The input unit 227 receives the condition in a state where no force is applied to the slot wedge 34, and outputs the condition to the relationship storage unit 228. The relationship storage unit 228 acquires and stores the deformation distribution of the inspection target surface 50 of the slot wedge 34 and the deformation-reaction force relationship of the reaction force based on the condition input by the input unit 227. The estimating unit 229 estimates the estimated reaction force from the measurement result of the inspection target surface 50 of the slot wedge 34 measured by the measuring unit 20 and the deformation-reaction force relationship stored in the relationship storage unit 228.

[0085] The determination unit 230 compares the estimated reaction force estimated by the estimation unit 229 with the reference value, determines the slot wedge 34, and outputs the determination result to the determination unit 231. The determination unit 231 determines whether the slot wedge 34 is updated based on the determination result of the determination unit 230, determines the appropriate operating condition of the rotating electrical machine 100, and outputs the determined operating condition to the display device 240. The operating condition includes the time during which the rotating electrical machine 100 can continue to operate (hereinafter referred to as the operable time) and the output of the rotating electrical machine 100 (hereinafter referred to as the appropriate output). In this case, the determination unit 231 can calculate the operable time and the appropriate output from the looseness amount and the generation position of the slot wedge 34.

[0086] Since the electromagnetic excitation force applied to the slot wedge 34 depends on the output of the rotating electrical machine 100, the electromagnetic excitation force applied to the slot wedge 34 can be reduced by limiting the output of the rotating electrical machine 100. The operable time is a standard time when repairs or parts replacements should be performed, and is a time from which the rotating electrical machine 100 can be stably operated if the rotating electrical machine 100 is operated at an appropriate output.

[0087] The display device 240 displays the operating conditions given by the determination unit 231. The operator can adjust the rotating electrical machine 100 to an appropriate output according to the display of the display device 240, thereby extending the life of the rotating electrical machine 100 even when the output is limited. In addition, the operator can perform repairs or parts replacement at an appropriate time according to the displayed operable time.

[0088] In addition, the determining unit 231 may output the determined appropriate output to a control device (not shown) that controls the output of the rotating electrical machine 100. In this case, the output of the rotating electrical machine 100 can be automatically adjusted to an appropriate output by the control device. In addition, the determining unit 231 may output the determined available operating time to an alarm device (not shown). In this case, when the operating time of the rotating electrical machine 100 approaches or reaches the available operating time, the alarm unit sounds an alarm (e.g., an alarm buzzer). Thus, the operator can easily grasp the period when repairs or parts replacement should be performed.

[0089] In addition, it is also possible to configure the display device 240 to display at least one of the deformation distribution of the deformation as the measurement result of the measuring unit 20 and the estimated reaction force as the looseness of the slot wedge 34 estimated by the estimating unit 229. In this case, the operator can obtain various information by viewing the display of the display device 240.

[0090] Next, intersperse Figures 8 to 11D , a method for inspecting the rotating electrical machine 100 of the inspection device 220 of the first embodiment configured as described above will be described. Fig.11A It is a diagram showing the actual structure of the slot wedge 34 , the spring 35 , and the core 31 . Fig. 11B Yes Fig.11A The structure shown is modeled in the figure. Fig. 11C Yes means Fig.11A FIG. 2 is a graph showing the relationship between the measurement position and the deformation amount on the inspection target surface 50 of the slot wedge 34. FIG. Fig.11D This is an equation that represents the relationship between the deformation and reaction force in the first embodiment.

[0091] First, when the rotating electrical machine 100 is assembled or when the rotating electrical machine 100 is disassembled for periodic inspection, etc., when the slot wedge 34 is not loose or when the loose slot wedge 34 is replaced, a random pattern (or graphic pattern) is applied to a predetermined surface of the slot wedge 34 exposed from the slot 33 to form the inspection target surface 50. In addition, it is also conceivable to form a random pattern on the inspection target surface 50 in advance before the slot wedge 34 is installed. Then, the control unit 221 controls the driving devices 211A, 211B and the photographing devices 210A, 210B to perform photography, and the acquisition unit 222 acquires initial image data of the inspection target surface 50 in a state where no force is applied to the slot wedge 34, and stores the data in the first storage unit 223 ( Figure 8 In addition, since the method of acquiring the image data of the inspection target surface 50 of the slot wedge 34 is the same below, its description is appropriately omitted.

[0092] Next, it is determined whether the predetermined inspection period has arrived due to various factors such as the operating time ( Figure 8 If the inspection time has not arrived (No), step ST2 is repeated. If the inspection time has arrived (Yes), the acquisition unit 222 acquires the inspection image data of the inspection target surface 50 of the slot wedge 34 and stores it in the first storage unit 223 ( Figure 8 Step ST3). Furthermore, deformation analysis processing in the slot wedge 34 is performed ( Figure 8 Step ST4). Moreover, this action is repeatedly performed during the inspection period.

[0093] Next, according to Fig. 9 ,right Figure 8 The processing contents of the "deformation analysis processing (step ST4)" shown in FIG. 2 are described. The generating unit 224 generates information ( ) of the deformation distribution from the inspection image data acquired by the acquiring unit 222 and the last inspection image data stored by the first storage unit 223. Fig. 9 Next, determine whether there is a change in the deformation distribution without deformation ( Fig. 9 If there is no change (No), the operation of step ST11 is repeated. If there is a change (Yes), the inspection unit 225 determines whether the deformation distribution is similar to the assumed deformation distribution, i.e., the trend information stored in the second storage unit 226 ( Fig. 9 Step ST14).

[0094] Furthermore, in the case of dissimilarities (No), the output is the case of measured anomalies ( Fig. 9 In a similar case (yes), the estimating unit 229 estimates the estimated reaction force ( Fig. 9 Next, the determination unit 230 compares the estimated reaction force of the slot wedge 34 with a preset reference value. If the estimated reaction force is greater than the reference value, it is determined that there is no looseness of the slot wedge 34, that is, it is good. If the estimated reaction force is less than the reference value, it is determined that there is looseness of the slot wedge 34, that is, it is bad. Fig. 9 Next, the operating condition of the rotating electrical machine 100 is determined based on the result of the determination in step ST16, and is output to the display device 240 ( Fig. 9 Step ST17).

[0095] Next, according to Fig.10 as well as FIG. 11A to FIG. 11D ,right Fig. 9 The processing contents of "estimating the looseness of the slot wedge 34 (step ST15)" shown in FIG. 1 are described below. First, the measuring unit 20 obtains the measurement result of the measured deformation distribution of the inspection target surface 50 of the slot wedge 34 ( Fig.10 Step ST19, measurement step). Specifically, as a measurement deformation distribution, the distribution of deformation of two or more points in the inspection target surface 50 of the slot wedge 34 is measured. For example, Fig. 11C The values ​​of the deformation amounts Y1, Y2, and Yn (n is an integer greater than or equal to 2) at the respective measurement positions of the wedge 34 are shown.

[0096] Next, information on the shape of the inspection target surface 50 and the shape of the slot wedge 34 when no force is applied to the slot wedge 34 is input from the input unit 227 ( Fig.10 Step ST18, input step). That is, input Fig.11A Next, the relationship storage unit 228 models the contact portion 300 between the core 31 and the slot wedge 34, and models the position where the reaction force F of the spring 35 is applied to the model. Fig. 11B As shown, in the actual slot wedge 34 ( Fig.11A ) in the axial direction Z, the reaction force F is constant, and the slot wedge 34 is made into a two-dimensional model. In addition, the contact portion 300 between the slot wedge 34 and the slot 33 is used as a constraint condition, and the range in which the reaction force F is applied to the slot wedge 34 is reflected in the model as the range of the loading load.

[0097] The above model is solved by numerical analysis such as material mechanics or finite element method to obtain Fig.11D The deformation distribution (Y1, Y2, ..., Yn) of the inspection target surface 50 and the deformation-reaction force relationship of the reaction force F are stored in the relationship storage unit 228 ( Fig.10 Step ST20, relationship storage step). In addition, here, an example of obtaining the deformation reaction force relationship by numerical analysis is shown, but it is not limited to this, and it can also be considered to be obtained experimentally. In addition, since this situation is the same in the following embodiments, its description is omitted.

[0098] Next, from the deformation reaction force relationship ( Fig.11D ) and the measurement result of step ST19, the reaction force F of the spring 35 is estimated and output as the estimated reaction force. Specifically, the estimating unit 229 estimates the reaction force F of the spring 35 as the estimated reaction force from the measured deformation distribution of the inspection target surface 50 of the slot wedge 34 in step ST19, which is the deformation amounts Y1, Y2, and Yn at three measurement positions in this case, and sets the deformation reaction force relationship saved in step ST20, and estimates the reaction force F as the estimated reaction force ( Fig.10 Step ST21, estimating step). Fig. 11C As shown in FIG. 1 , the reaction force F is estimated from the measurement position and the deformation amount of the strain and the deformation reaction force relationship between the deformation distribution (Y1, Y2, . . . Yn) of the inspection object surface 50 and the reaction force F of the spring 35 .

[0099] In the first embodiment, the measuring point as the measuring position of the inspection target surface 50 of the slot wedge 34 is not particularly shown, but FIG. 12A to FIG. 12C , other examples are described. Fig. 12A Yes means Figure 4 A diagram showing the actual structure of the slot wedge 34 , the spring 35 and the core 31 in the slot 33 is shown. Fig. 12B Yes Fig. 12A The structure shown is modeled in the figure. Fig. 12C Yes means Fig. 12A FIG. 2 is a graph showing the relationship between the measurement position and the deformation amount on the inspection target surface 50 of the slot wedge 34. FIG.

[0100] For example, FIG. 12A to FIG. 12C As shown, if the measurement points of the inspection target surface 50 of the slot wedge 34 are the measurement points of the inspection target surface 50 where the change in deformation is the largest, i.e., the central point XM (deformation value YM) in the circumferential direction X, and two points XE1 (deformation value YE1) and XE2 (deformation value YE2) near the contact portion 300 with the core 31 which are the ends of the measurable deformation distribution, as measurement points, the distribution can be grasped with good accuracy. Furthermore, by adding measurement points, the distribution can be grasped with further good accuracy, and the estimated reaction force can be estimated with good accuracy. In addition, since this situation is also the same in the following embodiments, its description is appropriately omitted.

[0101] In the first embodiment, the deformation distribution of the slot wedge 34 is shown as an example of a deformation distribution based on a digital image correlation method, but the present invention is not limited thereto. For example, the deformation distribution of any one of the displacement and angle of the inspection target surface 50 of the slot wedge 34 may be used. The parameters for measuring the deformation distribution can be selected from parameters that are easy to measure. The measurement method may be a strain gauge, an optical fiber, a strain sensor, a sampling moiré camera, etc. In addition, since this situation is also the same in the following embodiments, the description thereof is appropriately omitted.

[0102] In addition, in the above-mentioned embodiment 1, Figure 7 In the figure, the inspection device 220 is shown at various locations, but, of course, for example Fig.13 As shown, if the inspection device 220 has a processor 51 whose at least part of the function can be realized by software and a memory 52 for storing information, it can be realized. In addition, since this situation is also the same in the following embodiments, its description is appropriately omitted.

[0103] In the first embodiment, an example of a stator having slot wedges that fix the windings via springs is shown, but the present invention is not limited thereto, and a stator in which the windings are fixed by slot wedges that function as springs may be considered. In this case, the same operation as the spring described above can be performed based on the reaction force of the slot wedges that function as springs. This is also the case in the following embodiments, so the description thereof will be omitted as appropriate.

[0104] According to the inspection device for a rotating electrical machine of the first embodiment configured as described above, a rotating electrical machine is inspected, wherein the rotating electrical machine includes a stator and a rotor, the stator includes slot wedges that fix windings arranged in slots formed on the inner side in the radial direction of an annular iron core via springs or with a spring function, and the rotor is arranged on the inner side in the radial direction of the stator at a predetermined interval, wherein:

[0105] The above-mentioned inspection device for a rotating electrical machine comprises an input unit, a relationship storage unit, a measuring unit, an estimating unit and a determining unit.

[0106] The input unit inputs a shape of the inspection target surface of the slot wedge exposed from the slot in a state where no force is applied to the slot wedge.

[0107] The relationship storage unit acquires and stores, as a deformation reaction force relationship, a relationship between the reaction force of the spring or the slot wedge in the inspection target surface of the slot wedge and a deformation distribution of the shape of the inspection target surface of the slot wedge input to the input unit.

[0108] The measuring unit measures the measured deformation distribution of the inspection target surface of the slot wedge.

[0109] The estimating unit estimates the estimated reaction force from the measured deformation distribution and the deformation reaction force relationship.

[0110] The determination unit determines whether the looseness of the slot wedge is good or bad based on the estimated reaction force.

[0111] In addition, according to a method for inspecting a rotating electrical machine, a rotating electrical machine is inspected, the rotating electrical machine comprising a stator and a rotor, the stator having slot wedges for fixing windings arranged in slots formed on the inner side in the radial direction of an annular iron core via springs or with a spring function, the rotor being arranged on the inner side in the radial direction of the stator at a predetermined interval, wherein:

[0112] The above-mentioned inspection method of a rotating electrical machine comprises an input step, a relationship storage step, a measurement step and an estimation step.

[0113] In the input step, the shape of the inspection target surface of the slot wedge exposed from the slot in a state where no force is applied to the slot wedge is input,

[0114] In the relationship storing step, a relationship between the reaction force of the spring or the slot wedge in the inspection target surface of the slot wedge and the deformation distribution of the shape of the inspection target surface of the slot wedge input in the input step is obtained and stored as a deformation reaction force relationship.

[0115] In the measuring step, the measured deformation distribution of the inspection target surface of the slot wedge is measured.

[0116] In the estimating step, the estimated reaction force is estimated from the measured deformation distribution and the deformation reaction force relationship.

[0117] Furthermore, a determination step is provided, in which the goodness or badness of the looseness of the slot wedge is determined based on the estimated reaction force.

[0118] Therefore, since the looseness of the slot wedge is estimated from the measured deformation distribution of the inspection target surface of the slot wedge, the shape of the slot wedge and the support structure supporting the slot wedge are not deformed, and the state of the slot wedge can be inspected efficiently in a short time without disassembling the rotating electrical machine. Therefore, the situation in which the strength of the slot wedge is reduced due to factors in the inspection is eliminated.

[0119] In addition, since the measuring portion includes the central point of the inspection target surface of the slot wedge in the circumferential direction as a measuring point,

[0120] When measuring two or more points, the point closest to the core on the inspection target surface is included in the measurement.

[0121] Therefore, since a plurality of points of the slot wedge are used as measurement points, it is not necessary to perform multiple measurements, and the change in the reaction force can be efficiently checked by a single measurement.

[0122] In addition, the deformation distribution of the inspection target surface of the slot wedge and the measured deformation distribution are distributions of any one of deformation, displacement and angle of the inspection target surface.

[0123] Therefore, changes in the looseness of the wedge can be reliably determined.

[0124] Implementation method 2.

[0125] In the second embodiment, in the inspection device 220 and the inspection method of the rotating electrical machine 100 shown in the first embodiment, Fig. 9 The content of the processing of "estimating the looseness of the slot wedge 34" in step ST15 shown in FIG. Fig.14 as well as FIG. 15A to FIG. 15D, only the content of the different processing of "estimating the looseness of the slot wedge 34" will be described.

[0126] Fig.14 This is a diagram showing the above-mentioned embodiment 1 in the present embodiment 2. Fig. 9 The flowchart of the contents of the "process of estimating the looseness of the slot wedge 34" in step ST15 shown in FIG. Fig.10 Indicates similar processing. Fig.15A Yes means Figure 4 The diagram shows the actual structure of the slot wedge 34, the spring 35, and the core 31 in the slot 33. Fig. 15B Yes Fig.15A The structure shown is modeled in the figure. Fig. 15C Yes means Fig.15A FIG. 2 is a graph showing the relationship between the measurement position and the deformation amount on the inspection target surface 50 of the slot wedge 34. FIG. Fig.15D This is an equation that represents the relationship between the deformation and reaction force in the second embodiment.

[0127] Next, according to Fig.14 as well as FIG. 15A to FIG. 15D The following description will focus on the differences in the processing contents of "estimating the looseness of the slot wedge 34 (step ST15)" shown in the first embodiment. Fig.10 Step ST18 is equivalent to Fig.14 In step ST24, add Fig.10 In the content of step ST18, the shape of the contact portion 300 between the iron core 31 and the slot wedge 34 of the rotating electrical machine 100 and the shape of the contact portion between the slot wedge 34 and the spring 35 are input. In addition, the shape information includes a dimensional tolerance.

[0128] Next, in the same manner as in Implementation 1 Fig.10 Step ST20 is equivalent to Fig.14 In step ST25 of the above embodiment 1, Fig.10 In the content of step ST20, the dimensional tolerance of the contact portion 300 of the core 31 and the slot wedge 34 is changed within the range of the dimensional tolerance, and a deformation reaction force relationship as the relationship between the deformation distribution and the reaction force of the inspection object surface 50 is obtained by numerical analysis such as material mechanics or finite element method. Specifically, FIG. 15A to FIG. 15D As shown, at each contact point between the core 31 and the slot wedge 34, numerical analysis such as material mechanics or finite element method is used to obtain FIG. 15A to FIG. 15D The relationship between the deformation distribution and the reaction force of the inspection target surface 50 is shown. The acquisition result is stored in the relationship storage unit 228.

[0129] Next, as the deformation reaction force relationship saved in step ST25 and Fig.14 The measured deformation distribution of the inspection target surface 50 of the slot wedge 34 obtained in step ST19 is measured and inputted by measuring the deformation of two or more points. Fig.14 The measurement result of step ST19 is Fig.14 The estimated reaction force is estimated in step ST26. FIG. 15A to FIG. 15D As shown in the relationship between the deformation distribution and the reaction force of the inspection target surface 50, the contact point between the core 31 and the slot wedge 34 where the deformation position and value distribution are most consistent is obtained from the measured position and deformation value and the deformation reaction force relationship stored in the relationship storage unit 228. Next, using the contact point as a boundary condition, the deformation distribution and the deformation reaction force relationship of the inspection target surface 50 are selected from the relationship storage unit 228, and the measurement result of step ST19 is input to estimate the estimated reaction force.

[0130] In the second embodiment, the dimensional tolerances of the slot wedge 34, the iron core 31 and the spring 35 as the structure for supporting the slot wedge 34 are added. Therefore, for example, as shown in the first embodiment, FIG. 12A to FIG. 12C As shown in FIG. 1 , if the measurement position of the inspection target surface 50 of the slot wedge 34 where the change in deformation is the largest, that is, the central point XM (deformation value YM) in the circumferential direction X, and two points XE1 (deformation value YE1) and XE2 (deformation value YE2) near the contact portion 300 with the iron core 31, which are the ends of the measurable deformation distribution, are measured as measurement points, the distribution can be understood. Furthermore, by adding the position shifted from the central point XM in the circumferential direction X of the inspection target surface 50 by the maximum value and the minimum value of the dimensional tolerance as the measurement point, even if the contact portion between the iron core 31 and the slot wedge 34 is shifted, the maximum value of the change can be obtained, and the estimated reaction force can be estimated with good accuracy.

[0131] According to the inspection device and the inspection method of the rotating electrical machine of the second embodiment configured as described above, the same effects as those of the first embodiment are achieved, and the input portion is input with the dimensional tolerance of the slot wedge and the structure supporting the slot wedge when assembling the rotating electrical machine.

[0132] The deformation reaction force relationship stored in the relationship storage unit is obtained by changing within the dimensional tolerance.

[0133] In addition, in the input step, the dimensional tolerance of the slot wedge and the structure supporting the slot wedge when assembling the rotating electrical machine is input.

[0134] In the relationship storage step, the stored deformation reaction force relationship is obtained by changing within the dimensional tolerance.

[0135] Therefore, since the looseness of the slot wedge can be determined by reflecting the contact condition between the slot wedge and the structure supporting the slot wedge, for example, the iron core, the looseness determination accuracy can be improved.

[0136] In addition, the measuring portion includes a central point in the circumferential direction of the inspection target surface of the slot wedge as a measuring point.

[0137] When measuring two or more points, including the point on the inspection target surface closest to the core,

[0138] When three or more points are measured, the measurement is performed as a point shifted in the circumferential direction from the central point of the inspection target surface of the slot wedge to obtain the maximum or minimum value of the dimensional tolerance of the contact position between the slot wedge and the core when the rotating electrical machine is assembled.

[0139] Therefore, since a plurality of points of the slot wedge are used as measurement points, it is not necessary to perform multiple measurements, and the change in the reaction force can be efficiently checked by a single measurement.

[0140] Implementation method 3.

[0141] In the third embodiment, in the inspection device 220 and the inspection method of the rotating electrical machine 100 shown in the first embodiment, Fig. 9 The content of the processing of "estimating the looseness of the slot wedge 34" in step ST15 shown in FIG. Fig.16 as well as 17A to 17D , only the content of the different processing of "estimating the looseness of the slot wedge 34" will be described.

[0142] Fig.16 This is a representation of the above-mentioned embodiment 1 in the present embodiment 3. Fig. 9 The flowchart of the contents of the "process of estimating the looseness of the slot wedge 34" in step ST15 shown in FIG. Fig.10 Indicates similar processing. Fig.17A Yes means Figure 4 The diagram shows the actual structure of the slot wedge 34, the spring 35, and the core 31 in the slot 33. Fig. 17B Yes Fig.17A The structure shown is modeled in the figure. Fig. 17C Yes means Fig.17A FIG. 2 is a graph showing the relationship between the measurement position and the deformation amount on the inspection target surface 50 of the slot wedge 34. FIG. Fig.17D This is an equation that represents the relationship between the deformation and reaction force in the third embodiment.

[0143] Next, according to Fig.16 as well as 17A to 17DThe following description will focus on the differences in the processing contents of "estimating the looseness of the slot wedge 34 (step ST15)" shown in the first embodiment. Fig.10 The deformation reaction force relationship is obtained and saved in the same manner as step ST18 and step ST20. Next, as the measured deformation distribution of the inspection target surface 50 of the slot wedge 34, the deformation ( Fig.16 Step ST29).

[0144] Next, the reaction force variation amount ( ) as the estimated reaction force is estimated from the deformation reaction force relationship stored in step ST20 and the measurement result in step ST29. Fig.16 Specifically, the measurement of step ST29 is performed multiple times at intervals to find the difference in the measured deformation. Fig. 17C As shown in FIG. 1 , the variation ΔY of the difference in deformation of the inspection target surface 50 is obtained. Next, the variation ΔY and the deformation-reaction force relationship between the variation ΔY of the deformation of the inspection target surface 50 and the reaction force stored in step ST20 are selected from the relationship storage unit 228, and the variation ΔY is input to estimate the reaction force variation ΔF as the estimated reaction force. The following process is a process of determining whether the slot wedge 34 is good or bad based on the reaction force variation ΔF as the estimated reaction force.

[0145] According to the inspection device and the inspection method of the rotating electrical machine of the third embodiment configured as described above, the same effects as those of the first embodiment are achieved, and the measuring unit measures the measured deformation distribution of the inspection target surface of the slot wedge a plurality of times.

[0146] The estimating unit obtains a change amount of the reaction force from a plurality of time changes of the measured deformation distribution and the deformation-reaction force relationship as the estimated reaction force.

[0147] Furthermore, in the measuring step, the measured deformation distribution of the inspection target surface of the slot wedge is measured multiple times.

[0148] In the estimating step, the variation of the reaction force is obtained from the multiple time variations of the measured deformation distribution and the deformation-reaction force relationship as the estimated reaction force.

[0149] Therefore, the number of measurement points on the inspection target surface of the slot wedge can be reduced, and the measurement time can be reduced.

[0150] Implementation method 4.

[0151] In the fourth embodiment, in the inspection device 220 and the inspection method of the rotating electrical machine 100 shown in the first embodiment, Fig. 9The content of the processing of "estimating the looseness of the slot wedge 34" in step ST15 shown in FIG. Fig.18 as well as FIG. 19A to FIG. 19D Only the content of the processing of "estimating the looseness of the slot wedge 34" is described. In addition, in the present embodiment 4, the deformation reaction force relationship is changed within the dimensional tolerance and acquired in the same manner as in the above-mentioned embodiment 2.

[0152] Fig.18 This is a representation of the above-mentioned embodiment 1 in the present embodiment 4. Fig. 9 The flowchart of the contents of the "process of estimating the looseness of the slot wedge 34" in step ST15 shown in FIG. Fig.10 Indicates similar processing. Fig.19A Yes means Figure 4 The diagram shows the actual structure of the slot wedge 34, the spring 35, and the core 31 in the slot 33. Fig.19B Yes Fig.19A The structure shown is modeled in the figure. Fig.19C Yes means Fig.19A FIG. 2 is a graph showing the relationship between the measurement position and the deformation amount on the inspection target surface 50 of the slot wedge 34. FIG. Fig.19D This is an equation that represents the relationship between the deformation and reaction force in the fourth embodiment.

[0153] Next, according to Fig.18 as well as FIG. 19A to FIG. 19D The following description will focus on the differences in the processing contents of "estimating the looseness of the slot wedge 34 (step ST15)" shown in the first embodiment. Fig.14 The deformation-reaction force relationship is acquired in the same manner as in step ST24 and step ST25, and is stored in the relationship storage unit 228. In addition, measurement is performed in the same manner as in step ST29 of the third embodiment.

[0154] Next, the estimated reaction force ( Fig.18 Step ST37). First, the measurement of step ST29 is performed multiple times at intervals to obtain the change in the difference in the measured deformation amount. Specifically, FIG. 19A to FIG. 19D As shown in FIG. 1 , the change amount ΔY which is the difference in the deformation amount of the inspection target surface 50 is obtained. FIG. 19A to FIG. 19DAs shown in the relationship between the deformation and reaction force of the inspection target surface 50, the contact point between the core 31 and the slot wedge 34 where the measured deformation position and the change amount ΔY and the position and deformation value stored in the relationship storage unit 228 are consistent is obtained. Next, using the contact point as a boundary condition, the relationship between the change amount ΔY of the deformation of the inspection target surface 50 and the reaction force is selected from the relationship storage unit 228, and the measurement result of step ST29 is input to estimate the estimated reaction force.

[0155] According to the inspection device and the inspection method of the rotating electrical machine of the fourth embodiment configured as described above, the same effects as those of the first embodiment are achieved, and the measuring unit measures the measured deformation distribution of the inspection target surface of the slot wedge a plurality of times.

[0156] The estimating unit obtains a change amount of the reaction force from a plurality of time changes of the measured deformation distribution and the deformation-reaction force relationship as the estimated reaction force.

[0157] Furthermore, in the measuring step, the measured deformation distribution of the inspection target surface of the slot wedge is measured multiple times.

[0158] In the estimating step, the variation of the reaction force is obtained from the multiple time variations of the measured deformation distribution and the deformation-reaction force relationship as the estimated reaction force.

[0159] Therefore, the number of measurement points on the inspection target surface of the slot wedge can be reduced, and the measurement time can be reduced.

[0160] Furthermore, the contact condition between the slot wedge and the structure supporting the slot wedge, such as the iron core, can be reflected to determine the looseness of the slot wedge, thereby improving the accuracy of determining the looseness.

[0161] Implementation method 5.

[0162] In this embodiment 5, in the inspection device shown in embodiment 1, Figure 7 The processing contents of the determination unit 231 shown are different. Only this point will be described. Fig. 20 This is a flowchart showing a method for inspecting a rotating electrical machine according to a fifth embodiment.

[0163] Input any estimated reaction force obtained by the above-mentioned embodiments ( Fig. 20 Next, as the force applied to the slot wedge 34 during the operation of the rotary electric machine 100, the shape of the winding 36 and the amount of current flowing in the winding 36 are input ( Fig. 20 Then, through the input of step 40 and step ST41, the vibration value of the winding 36 during the operation of the rotating electrical machine 100 is estimated ( Fig. 20Specifically, the electromagnetic excitation force generated during the operation of the rotary electric machine 100 is estimated from the input of step ST41. If it is greater than the estimated reaction force input of step ST40, it is determined that the winding 36 is vibrating.

[0164] Furthermore, the relationship between the number of slot wedges whose reaction force is smaller than the electromagnetic excitation force and the vibration value is obtained in advance by numerical analysis, and the vibration value of the winding 36 is estimated from the distribution of the estimated reaction force of the slot wedge 34 measured in the iron core 31. Next, based on the result of the estimation in step ST42, it is determined whether it is above a preset reference value of the vibration value of the winding 36. The slot wedge 34 of the slot 33 estimated to be above the reference value is updated ( Fig. 20 Step ST43).

[0165] According to the inspection device and the inspection method of the rotating electrical machine of the fifth embodiment constructed as described above, the same effects as those of the above-described embodiments are achieved, and the device and the method include a determination step in which a vibration value of the entire winding provided in the slot of the core during operation of the rotating electrical machine is estimated based on shape information of the stator and the winding of the rotating electrical machine, an external force applied to the slot wedge during operation of the rotating electrical machine, and the estimated reaction force, and whether or not the slot wedge in the slot is updated is determined.

[0166] Therefore, the location to update the slot wedge can be determined for each slot, and the time required to update the slot wedge can be reduced.

[0167] Various illustrative embodiments and examples are described in the present disclosure; however, various features, methods, and functions described in one or more embodiments are not limited to application in specific embodiments and may be applied in the embodiments alone or in various combinations.

[0168] Therefore, numerous modifications not shown by way of example are contemplated within the technical scope disclosed in the specification of this application, including, for example, the case where at least one structural element is deformed, added, or omitted, and the case where at least one structural element is selected and combined with structural elements of other embodiments.

[0169] Description of Reference Numerals

[0170] 1: frame; 100: rotating electrical machine; 2: gas cooler; 20: measuring unit; 210A: photographing device; 210B: photographing device; 211A: driving device; 211B: driving device; 220: inspection device; 221: control unit; 222: acquisition unit; 223: first storage unit; 224: generation unit; 225: inspection unit; 226: second storage unit; 227: input unit; 228: relationship storage unit; 229: estimation unit ; 230: judging unit; 231: determining unit; 240: display device; 3: stator; 31: iron core; 32A: coil end; 33: slot; 34: slot wedge; 35: spring; 36: winding; 37: conductor; 38: insulating part; 4: rotor; 41: rotating shaft; 42: rotor core; 43A: retaining ring; 43B: retaining ring; 50: inspection object surface; X: circumferential direction; Y: radial direction; YO: outer side; YI: inner side; Z: axial direction.

Claims

1. An inspection device for a rotating electrical machine, for inspecting a rotating electrical machine, the rotating electrical machine comprising a stator and a rotor, the stator having slot wedges for fixing windings arranged in slots formed on the inner side in the radial direction of an annular iron core via springs or with a spring function, the rotor being arranged on the inner side in the radial direction of the stator at a predetermined interval, wherein: The above-mentioned inspection device for a rotating electrical machine comprises an input unit, a relationship storage unit, a measuring unit, an estimating unit and a determining unit. The input unit inputs a shape of the inspection target surface of the slot wedge exposed from the slot in a state where no force is applied to the slot wedge. The relationship storage unit acquires and stores, as a deformation reaction force relationship, a relationship between the reaction force of the spring or the slot wedge in the inspection target surface of the slot wedge and a deformation distribution of the shape of the inspection target surface of the slot wedge input to the input unit. The measuring unit measures the measured deformation distribution of the inspection target surface of the slot wedge. The estimating unit estimates the estimated reaction force from the measured deformation distribution and the deformation reaction force relationship. The determination unit determines whether the loosening of the wedge is good or bad based on the estimated reaction force.

2. The inspection device for a rotating electrical machine according to claim 1, wherein: the dimensional tolerance of the slot wedge and the structure supporting the slot wedge when the input portion is input into the assembly of the rotating electrical machine, The deformation reaction force relationship stored in the relationship storage unit is acquired by changing within the dimensional tolerance.

3. The inspection device for a rotating electrical machine according to claim 1, wherein: The measuring unit measures the measured deformation distribution of the inspection target surface of the slot wedge multiple times. The estimating unit obtains a change amount of the reaction force as the estimated reaction force from a plurality of time changes of the measured strain distribution and the strain-reaction force relationship.

4. The inspection device for a rotating electrical machine according to claim 2, wherein: The measuring unit measures the measured deformation distribution of the inspection target surface of the slot wedge multiple times. The estimating unit obtains a change amount of the reaction force as the estimated reaction force from a plurality of time changes of the measured strain distribution and the strain-reaction force relationship.

5. The inspection device for a rotating electrical machine according to any one of claims 1 to 4, wherein: The measuring portion includes a central point in the circumferential direction of the inspection target surface of the slot wedge as a measuring point, When measuring two or more points, including the point closest to the core on the inspection target surface, When three or more points are measured, a point having a maximum value or a minimum value of a dimensional tolerance of a contact position between the slot wedge and the core when assembling the rotating electrical machine is included, which is shifted in the circumferential direction from the central point of the inspection target surface of the slot wedge.

6. The inspection device for a rotating electrical machine according to any one of claims 1 to 4, wherein: The deformation distribution of the inspection target surface of the wedge and the measured deformation distribution are distributions of any one of deformation, displacement, and angle of the inspection target surface.

7. A method for inspecting a rotating electrical machine, comprising inspecting a rotating electrical machine, the rotating electrical machine comprising a stator and a rotor, the stator comprising slot wedges for fixing windings arranged in slots formed on the inner side in the radial direction of an annular iron core via springs or with a spring function, the rotor being arranged on the inner side in the radial direction of the stator at a predetermined interval, wherein: The above-mentioned inspection method of a rotating electrical machine comprises an input step, a relationship storage step, a measurement step and an estimation step. In the input step, the shape of the inspection target surface of the slot wedge exposed from the slot in a state where no force is applied to the slot wedge is input, In the relationship storing step, a relationship between the reaction force of the spring or the slot wedge in the inspection target surface of the slot wedge and the deformation distribution of the shape of the inspection target surface of the slot wedge input in the input step is obtained and stored as a deformation reaction force relationship. In the measuring step, the measured deformation distribution of the inspection target surface of the slot wedge is measured. In the estimating step, the estimated reaction force is estimated from the measured deformation distribution and the deformation-reaction force relationship.

8. The method for inspecting a rotating electrical machine according to claim 7, wherein: In the input step, the dimensional tolerances of the slot wedge and the structure supporting the slot wedge when assembling the rotating electrical machine are input. In the above-mentioned relationship storage step, the above-mentioned deformation reaction force relationship stored is obtained by changing it within the above-mentioned dimensional tolerance.

9. The method for inspecting a rotating electrical machine according to claim 7, wherein: In the measuring step, the measured deformation distribution of the inspection target surface of the slot wedge is measured multiple times. In the estimating step, the amount of change in the reaction force is obtained from the multiple time changes of the measured deformation distribution and the deformation-reaction force relationship as the estimated reaction force.

10. The inspection method for a rotating electrical machine according to claim 8, wherein: In the measuring step, the measured deformation distribution of the inspection target surface of the slot wedge is measured multiple times. In the estimating step, the amount of change in the reaction force is obtained from the multiple time changes of the measured deformation distribution and the deformation-reaction force relationship as the estimated reaction force.

11. The method for inspecting a rotating electrical machine according to any one of claims 7 to 10, wherein: The inspection method of the rotating electrical machine includes a determination step in which the quality or defect of the looseness of the wedge is determined based on the estimated reaction force.

12. The method for inspecting a rotating electrical machine according to any one of claims 7 to 10, wherein: The inspection method of the rotating electrical machine comprises a determination step, in which a vibration value of the entire winding arranged in the slot of the core during operation of the rotating electrical machine is estimated based on shape information of the stator and the winding of the rotating electrical machine, an external force applied to the slot wedge during operation of the rotating electrical machine, and the estimated reaction force, and it is determined whether the slot wedge in the slot is updated.

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