Wedge insertion machine for rotors and wedge insertion method for rotors

Abstract

This wedge insertion machine (10) comprises: a pressing device (11) that is disposed outside of a slot (21) in a radial direction (X), the pressing device (11) having a pressing part (11A) that is capable of moving in an axial direction (Z) of a rotor (100); an insertion jig (14) that is disposed outside of the slot (21) in the radial direction (X), the insertion jig (14) being moved in the axial direction (Z) by the pressing device (11), pressing a wedge (7) in the axial direction (Z), and being fitted inside the slot (21); a pressure sensor (13) that measures the pressing force with which the pressing part (11A) presses the wedge (7) in the axial direction (Z) via the insertion jig (14); and a reaction force receiver (50) that receives the reaction force of the pressing device (11) pressing the wedge (7) via the insertion jig (14).

Description

Technical Field

[0001] This application relates to a wedge insertion machine for a rotor and a method for inserting a wedge into a rotor.

Background Art

[0002] Generally, a plurality of grooves called slots extending in the axial direction are provided in the circumferential direction on the rotor core of a rotating electrical machine. A rotor coil is accommodated in this slot, and a wedge is inserted on the radially outer side of the rotor coil. This wedge prevents the rotor coil from jumping out radially outward when the rotor rotates.

[0003] This wedge needs to be inserted while controlling the pressing force for pressing the rotor coil inward in the radial direction within a predetermined range in order to suppress vibration during low-speed rotation of the rotor and to prevent the generation of wear powder of the coil. Since a plurality of wedges are inserted into each slot, it is necessary to insert each wedge by hammering or using an insertion device while pressing it into the slot.

[0004] As a device for inserting such a wedge into a rotor, for example, an arm-type wedge insertion machine disclosed in Patent Document 1 is known.

Prior Art Documents

Patent Documents

[0005]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0006] The wedge insertion machine for the rotor of a rotating electric machine disclosed in Patent Document 1 inserts a wedge a predetermined distance by moving an arm, but this requires manual arm operation by an operator, which has the problem of not being able to handle cases where a large wedge insertion force is required. Furthermore, the length of wedge that can be inserted at one time with the arm is short, for example, about 2 inches, and inserting a wedge over a long distance requires the troublesome process of unfastening, moving, and re-fastening the device, resulting in a long working time.

[0007] This invention was made to solve the above-mentioned problems, and aims to provide a rotor wedge insertion machine and a rotor wedge insertion method that have a large wedge insertion force and can shorten the working time. [Means for solving the problem]

[0008] The rotor wedge insertion machine disclosed herein is A rotor wedge insertion machine for inserting wedges that press coils housed in slots within the rotor core radially inward of the rotor, The slot has slot grooves on both circumferential sides radially outward from the coil, each groove being recessed in the circumferential direction and extending in the axial direction. The wedge has a wedge projection that protrudes circumferentially and extends axially, which is inserted into the slot groove. The aforementioned wedge insertion machine is, A pressing device having a pressing portion positioned radially outside the slot and movable in the axial direction of the rotor, An insertion jig is positioned radially outside the slot, moved axially by the pressing device, to press the wedge axially and fit it into the slot; The pressing portion includes a pressure sensor that measures the pressing force applied to the wedge in the axial direction via the insertion jig, The pressing device has a reaction force receiver that receives the reaction force applied to the wedge via the insertion jig. The wedge insertion method for a rotor disclosed herein is: A method for inserting a wedge into a rotor using the aforementioned rotor wedge insertion machine, The steps include temporarily inserting the wedge into the slot, The steps include: positioning the wedge insertion device in the opening of the slot; The method includes the step of pressing the insertion jig in the axial direction while measuring the pressing force of the pressing part of the pressing device using a pressure sensor. [Effects of the Invention]

[0009] The rotor wedge insertion machine and rotor wedge insertion method disclosed herein provide a rotor wedge insertion machine and rotor wedge insertion method that have a large wedge insertion force and can shorten the working time. [Brief explanation of the drawing]

[0010] [Figure 1] This is a perspective view of the rotor of a rotating electric machine according to Embodiment 1. [Figure 2] This is an enlarged view of the main part of the rotor core according to Embodiment 1. [Figure 3] This is an enlarged view of the vicinity of one slot in the rotor core of the rotor according to Embodiment 1, viewed along the axial direction. [Figure 4] This is a cross-sectional view along line AA in Figure 3. [Figure 5] This is a perspective view of the wedge according to Embodiment 1. [Figure 6] This is a perspective view showing the rotor wedge insertion machine according to Embodiment 1 attached to the opening of the slot. [Figure 7] Figure 6 is a cross-sectional view along line BB. [Figure 8] This is a perspective view of the wedge for receiving reaction force according to Embodiment 1. [Figure 9] This flowchart shows the procedure for inserting a rotor wedge into a rotating electric machine according to Embodiment 1. [Figure 10] This is a cross-sectional view showing the state in which coils are inserted into the slots of the rotor core according to Embodiment 1. [Figure 11]It is a cross-sectional view showing the state of the wedge temporarily inserted and the insulator disposed in the slot of the rotor core according to Embodiment 1. [Figure 12] It is a cross-sectional view showing the state where an insertion jig is attached to the temporarily inserted wedge according to Embodiment 1 and the wedge insertion machine 10 is attached to the rotor core. [Figure 13] It is a cross-sectional view showing the state where the wedge according to Embodiment 1 is inserted and completed at a predetermined position. [Figure 14] It is a perspective view showing the state where the wedge insertion machine of the rotor according to Embodiment 2 is attached to the opening of the slot. [Figure 15] It is a cross-sectional view taken along line C-C of FIG. 14. [Figure 16] It is a perspective view showing the state where the wedge insertion machine of the rotor according to Embodiment 3 is attached to the opening of the slot. [Figure 17] It is a cross-sectional view taken along line D-D of FIG. 16.

BEST MODE FOR CARRYING OUT THE INVENTION

[0011] Embodiment 1. Hereinafter, the wedge insertion machine of the rotor and the wedge insertion method of the rotor according to Embodiment 1 will be described with reference to the drawings. In this specification, unless otherwise specified, when referring to "axial direction", "circumferential direction", "radial direction", "inner side", "outer side", and "outer peripheral surface", they respectively refer to the "axial direction", "circumferential direction", "radial direction", "inner side", "outer side", and "outer peripheral surface" of the rotor. Further, in this specification, unless otherwise specified, when referring to "upper" and "lower", a plane perpendicular to the axial direction is assumed at the place mentioned, and the side including the center point of the rotor with that plane as a boundary is "lower", and the opposite is "upper". [[ID=三十一]]

[0012] First, the rotor of the rotating electric machine to which the wedge insertion machine of the rotor and the wedge insertion method of the rotor can be preferably applied will be described with reference to the drawings.

[0013] FIG. 1 is a perspective view of a rotor 100 of a rotating electric machine. FIG. 2 is an enlarged view of a main part of a rotor core 20. Figure 3 is a view of the rotor core of rotor 100 along the axial direction Z, and is an enlarged view of the vicinity of one slot 21. Figure 4 is a cross-sectional view of line AA in Figure 3, showing the configuration of the wedge 7, insulator 8, and coil 9. Figure 5 is a perspective view of wedge 7.

[0014] The outer circumferential surface 22 of the rotor core 20 is provided with slots 21 that are positioned inward in the radial direction X of the rotor core 20 and extend in the axial direction Z of the rotor core 20. Multiple slots 21 are formed on the outer circumferential surface 22 in the circumferential direction Y.

[0015] A coil 9 is housed within each slot 21, and an insulator 8 is positioned on the radially X-outside (upper side in Figure 4) of the coil 9. Further outside the radially X-outside of the insulator 8, a wedge 7 is inserted and fitted into the slot 21 to press the coil 9 inward in the radially X-outside, preventing it from protruding outward in the radially X-outside.

[0016] Each slot 21 has a slot groove 21M formed recessed in the circumferential direction Y on both sides 21S in the circumferential direction Y, which is radially X outward from the coil 9 and insulator 8 housed therein. The slot groove 21M extends in the axial direction Z of the slot 21 and is formed over the entire area of ​​the axial direction Z. The wedge 7 has wedge protrusions 7T on both sides in the circumferential direction Y that are inserted into the aforementioned slot groove 21M, protruding in the circumferential direction Y and extending in the axial direction Z.

[0017] The wedge-shaped projection 7T of the wedge 7 is inserted in the axial direction Z into these two slot grooves 21M so as to close the opening of the slot 21.

[0018] Furthermore, the wedge 7 has two wedge holes 7H extending in the radial direction X. The wedge 7 is inserted and fitted to the radially X-outside of the insulator 8, but in areas where the insulator 8 is not present, the wedge 7 has a fitting shape that allows it to move axially Z along the slot groove 21M of the slot 21.

[0019] The insulator 8 is plate-shaped and extends axially Z along both sides 21S of the slot 21. The insulator 8 may be formed integrally with the coil 9.

[0020] Figure 6 is a perspective view showing the wedge insertion device 10 (hereinafter simply referred to as the wedge insertion device 10) for the rotor 100 attached to the opening of the slot 21. Figure 7 is a cross-sectional view along line BB in Figure 6. Figure 8 is a perspective view of the reaction force receiving wedge 52. Next, the wedge insertion machine 10 will be described. The wedge insertion machine 10 is used to insert a wedge 7 into a predetermined position within the slot 21 of the rotor core 20, which presses the coil 9 housed within the slot 21 of the rotor 100 inward in the radial direction X. As shown in Figures 6 and 7, the rotor wedge insertion machine 10 comprises a pressing device 11, a pressure sensor 13, an insertion jig 14, and a reaction force receiver 50. The components of the wedge insertion machine 10 are arranged in the axial direction Z, starting from one end in the axial direction Z, in the order of reaction force receiver 50, pressing device 11, pressure sensor 13, and insertion jig 14, on the opening of the slot 21.

[0021] The pressing device 11 has a pressing portion 11A that expands and contracts in the axial direction Z. The pressing portion 11A presses an insertion jig 14, which inserts the wedge 7 into the rotor core 20 in the axial direction Z, via a pressure sensor 13. A cylinder mechanism or the like that moves in the axial direction Z is used as the pressing portion 11A. The pressing device 11 is positioned on the outside of the slot 21 in the radial direction X. The pressure sensor 13 is a sensor that measures the force with which the wedge 7 is inserted into the slot 21 of the rotor core 20. The insertion jig 14 is a jig that transmits the pressing force of the pressing device 11 to the wedge 7. The insertion jig 14 is positioned on the outside of the slot 21 in the radial direction X. The insertion jig 14 has two through holes 14H that penetrate in the radial direction X.

[0022] The insertion jig 14 and the wedge 7 are integrated by inserting the pin P2 into the through hole 14H provided in the insertion jig 14 and the wedge hole 7H provided in the wedge 7. The wedge hole 7H may also serve as an air passage for the cooling gas of the rotor 100.

[0023] The reaction force receiver 50 is responsible for receiving the reaction force generated when the pressing device 11 presses the wedge 7 via the insertion jig 14. The reaction force receiver 50 is positioned on the opposite side in the axial direction Z from the side where the pressing portion 11A of the pressing device 11 is located.

[0024] The reaction force receiver 50 comprises a key 51, a reaction force receiving wedge 52, and a reaction force receiving jig 53. The reaction force receiving jig 53 is a member that directly receives the reaction force of the pressing force when the wedge 7 is inserted on the outside of the insulator 8 in the radial direction X and fitted into the slot 21, and is positioned on the outside of the slot 21 in the radial direction X.

[0025] The reaction force receiving jig 53 is positioned radially outward in the X direction of the slot 21 such that its inner surface in the axial direction Z contacts the surface in the axial direction Z opposite to the pressing portion 11A of the pressing device 11, and directly receives the reaction force from the pressing device 11.

[0026] The reaction force receiving wedge 52 is integrated with the reaction force receiving jig 53 and is a member that receives the reaction force from the pressing device 11. The reaction force receiving wedge 52 has a reaction force receiving wedge projection 52T that protrudes in the circumferential direction Y and extends in the axial direction Z. And, similar to the wedge 7, the reaction force receiving wedge 52 is inserted into the slot 21 from the axial direction Z such that the reaction force receiving wedge projection 52T is aligned with the slot groove 21M.

[0027] The shape of both end faces of the reaction force receiving wedge 52 in the axial direction Z is the same as the shape of the end face of the wedge 7 in the axial direction Z, and thus its appearance is the same as that of the wedge 7. However, the reaction force receiving wedge 52 is provided with a keyway 52M (second keyway) on its outer surface in the radial direction X, which extends in the circumferential direction Y and is recessed inward in the radial direction X.

[0028] The reaction force receiving jig 53 and the reaction force receiving wedge 52 are integrated by inserting a pin P1 into a through hole 53H provided in the radial direction X of the reaction force receiving jig 53 and a hole 52H provided in the radial direction X of the reaction force receiving wedge 52. As shown in Figure 7, if there is a cavity between the coil 9 and the inside of the reaction force receiving wedge 52 in the radial direction X, the pin P1 is either a bolt or has a shape that prevents it from falling out inward in the radial direction X. Since the reaction force receiving jig 53 and the reaction force receiving wedge 52 are integrated as described above, the reaction force from the pressing device 11 is transmitted to the reaction force receiving wedge 52.

[0029] The key 51 is inserted across the circumferential direction Y into a key groove 20M (first key groove) which is recessed radially X on the outer circumferential surface of the rotor core 20 near the axial end Z of the rotor core 20, and into the aforementioned key groove 52M of the reaction force receiving wedge 52. The reaction force receiving wedge 52 is fixed in the opening of the slot 21 by the key 51 so as not to move axially Z. Note that the key groove 20M may be the groove for the retaining ring 25 of the rotor 100 shown in Figure 1.

[0030] In this manner, the reaction force from the reaction force receiving jig 53 is transmitted to the reaction force receiving wedge 52 integrated with it, and is received by the rotor core 20 via the key 51.

[0031] Next, the insertion operation of wedge 7 will be explained using Figures 9 to 13. Figure 9 is a flowchart showing the procedure for inserting a wedge into the rotor of a rotating electric machine. Figure 10 is a cross-sectional view showing the coil 9 inserted into the slot 21 of the rotor core 20. Figure 11 is a cross-sectional view showing the state of the insulator 8 placed in the rotor core 20 slot 21 and the temporarily inserted wedge 7. Figure 12 is a cross-sectional view showing the wedge insertion machine 10 attached to the rotor core 20 by attaching the insertion jig 14 to the temporarily inserted wedge 7. Figure 13 is a cross-sectional view showing the state after the wedge 7 has been inserted into a predetermined position.

[0032] First, prepare the wedge insertion machine 10 (step S11). Next, an insulator 8 with an adjusted radial X thickness is placed in a predetermined position within the slot 21 into which the coil 9 is inserted (step S12). Then, the wedge 7 is inserted into the slot 21 of the rotor core 20 so that the wedge protrusions 7T protruding from both sides in the circumferential Y direction of the wedge 7 are aligned with the slot groove 21M, starting from the axial Z end of the wedge 7. At this time, the wedge 7 is temporarily inserted onto the insulator 8 as far as it can be pushed in by hand (step 13).

[0033] Next, as shown in Figure 12, the insertion jig 14 is placed on the wedge 7, and the pin P2 is inserted, aligning the through hole 14H of the insertion jig 14 with the wedge hole 7H of the wedge 7. Subsequently, the pressure sensor 13 is placed in contact with the insertion jig 14. Next, the reaction force receiving wedge 52 is inserted into the slot 21 from the axial direction Z, similar to the wedge 7, and the reaction force receiving jig 53 is placed in a predetermined position. Then, the through hole 53H of the reaction force receiving jig 53 and the hole 52H of the reaction force receiving wedge 52 are aligned, and the pin P1 is inserted.

[0034] Subsequently, the key 51 is inserted into the keyway 20M provided in the rotor core 20 and the keyway 52M of the reaction force receiving wedge 52, fixing the axial Z position of the reaction force receiving wedge 52 and the reaction force receiving jig 53. Finally, the pressing device 11, including the pressing part 11A, is placed in the opening of the slot 21, and a pipe for flowing the working fluid is connected to the connection part 11IN of the pressing device 11 (step S14). It is preferable to use oil, for example, as the working fluid.

[0035] After step S14, working fluid is supplied into the pressing portion 11A. The working fluid in the pressing device 11 and the pressing portion 11A causes the pressing portion 11A to move toward the pressure sensor 13. After the pressing portion 11A comes into contact with the pressure sensor 13, the force acting due to the pressure of the working fluid moves the wedge 7 in the axial direction Z to a predetermined position via the pressure sensor 13 and the insertion jig 14, pressing it and fitting it into the slot 21.

[0036] Next, the pressing device 11 is driven to press and insert the wedge 7 in the axial direction Z to a predetermined position (step S15). During this operation, the pressing force of the wedge 7 measured by the pressure sensor 13 is checked to see if it is within a predetermined range. If the measurement value is within the range (step S16-YES) and insertion is completed, the working fluid is discharged through the connection part 11IN and the axial length Z of the pressing part 11A is returned to its original length.

[0037] Afterward, the wedge insertion machine 10 is removed. By repeating this procedure, a predetermined number of wedges 7 are inserted into each slot 21, and the wedge insertion work is completed.

[0038] If the measured insertion force of the wedge 7 is not within the predetermined range (step S16-NO), the working fluid is discharged through the connection part 11IN, and the axial length Z of the pressing part 11A is returned to its original length. Then, the temporarily inserted wedge 7 and the placed insulator 8 are removed and replaced with an insulator 8 whose thickness has been adjusted so that the wedge insertion force is within the range. From here on, the same procedure is followed from step S12 and the process is repeated. Once all the wedges 7 have been inserted into the slots 21 and fitted, the wedge insertion machine 10 is removed to complete the process (step S17).

[0039] Furthermore, since there is a limit to the movable length of the pressing portion 11A in the axial direction Z, if the position of the wedge 7 to be inserted and the position of the reaction force receiving jig 53, which is determined by the keyway 20M provided in the rotor core 20, are far apart, the range of wedge 7 that can be installed can be adjusted by inserting a spacer 15 between the pressing portion 11A and the pressure sensor 13.

[0040] Alternatively, a spacer 15 may be placed between the pressure sensor 13 and the insertion jig 14, or between the pressing device 11 and the reaction force receiving jig 53.

[0041] According to the rotor wedge insertion machine 10 and rotor wedge insertion method of Embodiment 1, The rotor wedge insertion machine is, A rotor wedge insertion machine for inserting wedges that press coils housed in slots within the rotor core radially inward of the rotor, The slot has slot grooves on both circumferential sides radially outward from the coil, each groove being recessed in the circumferential direction and extending in the axial direction. The wedge has a wedge projection that protrudes circumferentially and extends axially, which is inserted into the slot groove. The aforementioned wedge insertion machine is, A pressing device having a pressing portion positioned radially outside the slot and movable in the axial direction of the rotor, An insertion jig is positioned radially outside the slot, moved axially by the pressing device, to press the wedge axially and fit it into the slot; The pressing portion includes a pressure sensor that measures the pressing force applied to the wedge in the axial direction via the insertion jig, Since the pressing device has a reaction force receiver that receives the reaction force that presses the wedge via the insertion jig, This invention provides a rotor wedge insertion machine and rotor wedge insertion method that have a large wedge insertion force and can shorten the working time. Furthermore, since the wedge insertion machine 10 can be installed directly into the rotor slot opening, the installation space required for the equipment can be reduced.

[0042] Furthermore, since the required wedge insertion force can be generated and the magnitude of that insertion force can be accurately measured by the pressure sensor 13, the quality of the product can be kept consistent.

[0043] Furthermore, since the rotor core 20 is configured to receive the reaction force when the wedge 7 is inserted, the insertion force when pressing and inserting the wedge 7 can be measured and controlled within a predetermined range.

[0044] Therefore, it can handle situations requiring large wedge insertion forces, such as those exceeding 1 ton, and the insertion force when pressing and inserting the wedge can be controlled within a predetermined range. Furthermore, even when inserting wedges over long distances exceeding 300 mm, the frequency of rearranging the wedge insertion machine can be reduced, shortening the work period.

[0045] Furthermore, the rotor wedge insertion machine is, The rotor core has a first keyway provided circumferentially and recessed radially on the outer circumferential surface of its axial end, The reaction force receiver is positioned on the opposite side in the axial direction from the side where the pressing portion of the pressing device is located. The aforementioned reaction force receiver is A reaction force receiving jig that presses the wedge in the axial direction and receives the reaction force of the pressing force when the wedge is fitted, Displaced within the slot and coupled to the reaction force receiving jig, the wedge has a second key groove on its radially outer surface that extends circumferentially and is recessed radially inward, and a reaction force receiving wedge that is inserted into the slot groove and has a reaction force receiving wedge projection that protrudes circumferentially and extends axially. Since the rotor is equipped with a rod-shaped key inserted circumferentially into the first keyway and the second keyway, the reaction force pressing the wedge 7 by the rotor core can be reliably received. This allows the pressure sensor 13 to accurately measure the pressing force.

[0046] Furthermore, the rotor wedge insertion machine is, The insertion jig is positioned radially outside the slot, The wedge has a wedge hole provided in the radial direction, The insertion jig has a through hole that penetrates in the radial direction, Since the insertion jig and the wedge are integrated by passing a pin through the through hole of the insertion jig and the hole of the wedge, the wedge 7 can be moved to the insertion position in advance and then connected to the wedge insertion machine, thereby improving the productivity of the wedge insertion work.

[0047] Furthermore, the method for inserting the wedge into the rotor is as follows: A method for inserting a wedge into a rotor using the aforementioned rotor wedge insertion machine, The steps include temporarily inserting the wedge into the slot, The steps include: positioning the wedge insertion device in the opening of the slot; Since the process includes measuring the pressing force of the pressing part of the pressing device with a pressure sensor while pressing the insertion jig in the axial direction, the wedge insertion machine 10 can be placed in the opening of the slot after the wedge 7 has been temporarily inserted, thereby improving work efficiency.

[0048] Furthermore, the method for inserting the wedge into the rotor is as follows: Since the process includes adjusting the radial thickness of the insulator placed on the radially outer side of the coil according to the measurement value of the pressure sensor, an appropriate insertion force can be applied to each wedge 7 even if there are manufacturing variations in the wedges 7.

[0049] Furthermore, the method for inserting the wedge into the rotor is as follows: A method for inserting a wedge into a rotor using the aforementioned rotor wedge insertion machine, Since multiple rotor wedge insertion machines are used simultaneously, the process of inserting the wedges 7 into the slots 21 can be carried out concurrently, thus shortening the manufacturing and maintenance time for the rotor 100.

[0050] Embodiment 2. The following describes the rotor wedge insertion machine and rotor wedge insertion method according to Embodiment 2, focusing on the differences from Embodiment 1.

[0051] Figure 14 is a perspective view showing the rotor wedge insertion machine 210 (hereinafter simply referred to as the wedge insertion machine 210) attached to the opening of the slot 21. Figure 15 is a cross-sectional view along the CC line in Figure 14. The wedge insertion machine 210 according to this second embodiment and the wedge insertion machine 10 described in the first embodiment differ in the configuration of the reaction force receiver 250, but the other configurations are the same as in the first embodiment. In Figures 14 and 15, the same reference numerals are used for parts that are the same as those in Figures 1 to 13 described in the first embodiment, and detailed explanations are omitted.

[0052] As shown in Figures 14 and 15, the reaction force receiver 250 of the wedge insertion machine 210 includes a reaction force receiving jig 253 and a reaction force receiving wedge 252 that receive the reaction force when the wedge 7 is inserted due to the frictional force with the slot groove portion 21M.

[0053] The reaction force receiving jig 253 has a threaded through hole 253H in the radial direction X, and the reaction force receiving wedge 252 also has a threaded through hole 252H in the radial direction X, and a bolt B1 can be passed through both and tightened. When the bolt B1 is passed through the through hole 253H of the reaction force receiving jig 253 and the through hole 252H of the reaction force receiving wedge 252 and tightened, the tip B1S of the bolt B1 abuts against the base plate 74 placed on the outer peripheral surface of the coil 9 in the radial direction X. When the bolt B1 is tightened further, the reaction force receiving wedge 252 moves outward in the radial direction X. The reaction force receiving wedge projection 252T of the reaction force receiving wedge 252 is pressed against the outer surface of the slot groove 21M in the radial direction X and fixed in the slot 21 by frictional force. The shape of the wedge projection 252T for receiving reaction force is the same as the shape of the wedge projection 52T for receiving reaction force described in Embodiment 1.

[0054] As a result, the frictional force between the rotor core 20 and the reaction force receiving wedge 252 allows it to withstand the axial force Z, and the reaction force receiving jig 253 and the reaction force receiving wedge 252, which together form the reaction force receiving jig 253 and the reaction force receiving wedge 252, function as the reaction force receiving for the wedge insertion machine 210.

[0055] According to the rotor wedge insertion machine 210 and rotor wedge insertion method of Embodiment 2, The reaction force receiver is positioned on the opposite side in the axial direction from the side where the pressing portion of the pressing device is located. The reaction force receiver includes a reaction force receiving jig that presses the wedge in the axial direction and receives the reaction force of the pressing force when the wedge is fitted, The system includes a wedge for receiving a reaction force, which is positioned within the slot and coupled to the reaction force receiving jig, and which has a wedge projection for receiving a reaction force that protrudes circumferentially and extends axially, and is inserted into the slot groove, The reaction force receiving jig and the reaction force receiving wedge each have through holes that communicate in the radial direction with threads, and the reaction force receiving wedge can be fixed in the slot by bolts passed through each of the through holes, The wedge insertion machine 210 can be used even if a keyway 20M is not provided on the rotor core, or even if the wedge 7 is inserted at a location away from the keyway 20M.

[0056] In Embodiment 2, the reaction force receiving jig 253 and the reaction force receiving wedge 252 can also be used in combination with the configuration in which the key 51 is inserted into the keyway 20M described in Embodiment 1.

[0057] Embodiment 3. The following describes the rotor wedge insertion machine and rotor wedge insertion method according to Embodiment 3, focusing on the differences from Embodiment 2.

[0058] Figure 16 is a perspective view showing the rotor wedge insertion machine 310 (hereinafter simply referred to as wedge insertion machine 310) attached to the opening of the slot 21. Figure 17 is a cross-sectional view of the DD line in Figure 16.

[0059] The wedge insertion machine 310 according to this third embodiment differs from the wedge insertion machines 10 and 210 described in embodiments 1 and 2 in the configuration of the insertion jig 314, while the other configurations are the same as those of embodiment 1 or embodiment 2. In Figures 16 and 17, the same reference numerals are used for parts that are the same as those in Figures 1 to 15 described in embodiments 1 and 2, and detailed explanations are omitted.

[0060] As shown in Figure 17, the insertion jig 314 of the wedge insertion machine 310 has its main body positioned outside the slot 21 in the radial direction X, and its rear end in the Z direction, which is the insertion direction of the wedge 7, is provided with a projection 314T that protrudes into the slot 21 in the radial direction X and presses the wedge 7 in the axial direction Z.

[0061] According to the rotor wedge insertion machine 210 and rotor wedge insertion method of Embodiment 3, The insertion jig is positioned radially outside the slot and has a projection that protrudes into the slot and presses against the insertion jig, Even if the wedge 307 does not have a wedge hole 7H, the insertion jig 314 can press the wedge 307 in the axial direction Z and insert it onto the insulator 8.

[0062] Although this application describes various exemplary embodiments and examples, the various features, aspects, and functions described in one or more embodiments are not limited to the application of a particular embodiment, but can be applied individually or in various combinations to the embodiments. Accordingly, countless variations not illustrated are conceivable within the scope of the art disclosed herein. These include, for example, modifying, adding or omitting at least one component, or even extracting at least one component and combining it with components of other embodiments. [Explanation of symbols]

[0063] 100 Rotor, 10,210,310 Wedge insertion machine, 11 Pressing device, 11A Pressing part, 11IN Connection part, 13 Pressure sensor, 14,314 Insertion jig, 15 Spacer, 14H,53H,252H,253H Through hole, 314T Projection, 20 Rotor core, 20M,52M Keyway, 21 Slot, 21M Slot groove, 21S Side surface, 22 Outer circumference, 25 Retaining ring, 50,250 Reaction force receiver, 51 Key, 52,252 Wedge for reaction force receiver, 52H Hole, 53,253 Reaction force receiver jig, 7,307 Wedge, 7H Wedge hole, 8 Insulator, 9 Coil, 7T Wedge projection, 52T,252T Wedge projection for receiving reaction force, B1 bolt, B1S tip, 74 base plate, X radial direction, Y circumferential direction, Z axial direction.

Claims

1. A rotor wedge insertion machine for inserting wedges that press coils housed in slots within the rotor core radially inward of the rotor, The slot has slot grooves on both circumferential sides radially outward from the coil, each groove being recessed in the circumferential direction and extending in the axial direction. The wedge has a wedge projection that protrudes circumferentially and extends axially, which is inserted into the slot groove. The aforementioned wedge insertion machine is, A pressing device having a pressing portion positioned radially outside the slot and movable in the axial direction of the rotor, An insertion jig is positioned radially outside the slot, moved axially by the pressing device, to press the wedge axially and fit it into the slot; The pressing portion includes a pressure sensor that measures the pressing force applied to the wedge in the axial direction via the insertion jig, A wedge insertion machine for a rotor, having a reaction force receiver that receives the reaction force of the pressing device pressing the wedge via the insertion jig.

2. The rotor core has a first keyway provided circumferentially and recessed radially on the outer circumferential surface of its axial end, The reaction force receiver is positioned on the opposite side in the axial direction from the side where the pressing portion of the pressing device is located. The aforementioned reaction force receiver is A reaction force receiving jig that presses the wedge in the axial direction and receives the reaction force of the pressing force when the wedge is fitted, Displaced within the slot and coupled to the reaction force receiving jig, the wedge has a second key groove on its radially outer surface that extends circumferentially and is recessed radially, and a reaction force receiving wedge projection that protrudes circumferentially and extends axially, which is inserted into the slot groove, The rotor wedge insertion machine according to claim 1, further comprising a rod-shaped key inserted circumferentially into the first keyway and the second keyway.

3. The reaction force receiver is positioned on the opposite side in the axial direction from the side where the pressing portion of the pressing device is located. The reaction force receiver includes a reaction force receiving jig that presses the wedge in the axial direction and receives the reaction force of the pressing force when the wedge is fitted, The system includes a wedge for receiving a reaction force, which is positioned within the slot and coupled to the reaction force receiving jig, and which has a wedge projection for receiving a reaction force that protrudes circumferentially and extends axially, and is inserted into the slot groove, The wedge insertion machine for a rotor according to claim 1, wherein the reaction force receiving jig and the reaction force receiving wedge each have through holes communicating in the radial direction with threads, and the reaction force receiving wedge can be fixed in the slot by bolts passed through each of the through holes.

4. The insertion jig is positioned radially outside the slot, The wedge has a wedge hole provided in the radial direction, The insertion jig has a through hole that penetrates in the radial direction, The rotor wedge insertion machine according to any one of claims 1 to 3, wherein the insertion jig and the wedge are integrated by passing a pin through the through hole of the insertion jig and the hole of the wedge.

5. The wedge insertion machine for a rotor according to any one of claims 1 to 3, wherein the insertion jig is positioned radially outside the slot and has a projection that protrudes into the slot and presses the wedge.

6. A method for inserting a wedge into a rotor using a rotor wedge insertion machine according to any one of claims 1 to 3, The steps include temporarily inserting the wedge into the slot, The steps include: positioning the wedge insertion device in the opening of the slot; A wedge insertion method for a rotor, comprising the step of pressing the insertion jig in the axial direction while measuring the pressing force of the pressing part of the pressing device with a pressure sensor.

7. A rotor wedge insertion method using a plurality of rotor wedge insertion machines described in any one of claims 1 to 3 simultaneously, The steps include temporarily inserting the wedge into the slot, The steps include: positioning the wedge insertion device in the opening of the slot; A wedge insertion method for a rotor, comprising the step of pressing the insertion jig in the axial direction while measuring the pressing force of the pressing part of the pressing device with a pressure sensor.

8. The rotor wedge insertion method according to claim 6, further comprising the step of adjusting the radial thickness of an insulator placed on the radially outer side of the coil according to the measurement value of the pressure sensor.

9. The rotor wedge insertion method according to claim 7, further comprising the step of adjusting the radial thickness of an insulator placed on the radially outer side of the coil according to the measurement value of the pressure sensor.

Images