JP2016005396A - Assembly method of rotor for motor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the adhesion of a laminated core 45 or a first collar 40 and a rotor sleeve 43 from being exfoliated by an excessive load in which an injection pressure of resin 57 acts on the laminated core 45.SOLUTION: A rotor sleeve 43 is held between an upper mold 80 and a lower mold 66. At such a time, the number of thin steel plates is adjusted in such a manner that the load to acts on a laminated core 45 is set between a lower limit load with which the resin is prevented from leaking from a gap between the thin steel plates, and an upper limit load with which the adhesion is prevented from being exfoliated by spring-back. Thereafter, a plunger 71 is operated to inject resin 57 into a slit 47 within the laminated core 45. The injection pressure of the resin 57 acts on the rotor sleeve 43, so that the excessive pressure is prevented from being applied to the laminated core 45.

Description

  The present invention relates to a method for assembling a rotor of an electric motor, and to a method for assembling a rotor in which mold resin is injected into a slit formed in an iron core in which thin steel plates are laminated.

  Conventionally, as a method for injecting resin into a rotor, a configuration described in Patent Document 1 below is known.

  As shown in FIG. 3, the rotor assembly method described in Patent Document 1 is a laminated iron core in which magnet pieces 15 are inserted into magnet insertion holes 12 and 13 between a mold die 10 and a holding die 11. In the method of manufacturing a laminated steel plate in which the main body 14 is inserted, the mold resin 19 is injected from the resin reservoir 16 and the magnet pieces 15 are fixed to the magnet insertion holes 12 and 13, the mold mold 10 and the laminated core body 14 A guide member 18 having a resin flow path 31 extending from the resin reservoir 16 toward the magnet insertion holes 12 and 13 and having a gate 30 communicating with the magnet insertion holes 12 and 13 on the downstream side of the resin flow path 31 is interposed therebetween. Had been placed.

  However, a general rotor is rarely formed only of the laminated core body 14 as shown in Patent Document 1. For example, the built-in motor rotor mounted on the spindle of the machine tool is arranged on both sides of the laminated core, in addition to the laminated core, and arranged on the inner diameter side of the laminated core, with a collar for adjusting the balance of the rotor, The rotor sleeve is formed so as to be fitted with the shape of the main shaft to which the rotor is attached.

  4a and 4b are diagrams showing the configuration of the rotor of the built-in motor, in which FIG. 4a shows a cross section including the rotation axis of the rotor, and FIG. 4b shows a cross section orthogonal to the rotation axis. 40 is a first collar, 41 is a second collar, 43 is a rotor sleeve, 45 is a laminated iron core, 47 is a slit, 49 is a permanent magnet, 51 is a U-shaped groove, 54 is a resin injection path, and resin 57 is U It is injected into the groove 51 and the slit 47.

  As a method of manufacturing the rotor of FIG. 4, first, a rotor laminated iron core in which resin 57 is injected into the laminated iron core 45 is manufactured by the method disclosed in Patent Document 1 described above, and the first collar 40 and the second collar 40 are manufactured. A method of fixing together with the collar 41 to the rotor sleeve 43 by shrink fitting or adhesion is conceivable. However, when the rotor laminated core is manufactured by the method of Patent Document 1, the injected resin 57 leaks out to the inner diameter side of the laminated core 45, and the guide shaft 38 and the laminated core shown in FIG. It turns out that there is a problem that it will not be able to escape.

  Therefore, instead of the guide shaft 38, the first and second collars 40 and 41 and the laminated iron core 45 are directly fixed to the rotor sleeve 43, and then the resin 57 is injected.

  First, as the material of the resin 57 to be injected, a thermosetting resin or a room temperature curable resin is used. However, a resin having a low viscosity has a troublesome post-treatment because the resin leaks out from the gaps between the steel plates constituting the laminated core at the time of injection and hardens. Therefore, post-treatment can be facilitated by using a resin having a high viscosity for injection.

  The collars 40 and 41 and the laminated iron core 45 are fixed to the outer diameter of the rotor sleeve 43 by a method such as adhesion or shrink fitting. However, if the collars 40 and 41 and the laminated iron core 45 are to be fixed to the rotor sleeve 43 by a shrinkage fitting method, it is necessary to put them into the heating furnace three times. First, in order to heat the first and second collars 40 and 41 and the laminated iron core 45 for shrink fitting, they are put into a furnace. Next, it is put into a furnace to heat the rotor before resin injection. This is performed for the purpose of facilitating pouring into the slit by raising the temperature to lower the viscosity when the viscosity of the resin 57 is too high. Further, when a thermosetting resin is used, it is put into a furnace to cure the resin. Thus, it must be put in the furnace three times, and the manufacturing process of the rotor becomes long and the manufacturing cost increases. On the other hand, if it is a fixing method using an adhesive, heating by shrink fitting can be eliminated and the number of times of putting in the furnace can be reduced to two times, so that the manufacturing process can be reduced and the manufacturing cost can be reduced. . In addition, when a thermosetting adhesive is used, since the adhesive can be simultaneously cured in the heating step before the resin injection, the number of times of entering the furnace does not increase.

  Next, a method for injecting the resin 57 will be described. FIG. 5 is a view in which a jig for injecting the resin 57 into the rotor of the built-in motor is attached. 60 is an upper mold, 62 is a resin flow path, 66 is a lower mold, 68 is a bolt, 70 is a lower base, and 71 is a plunger. Each element constituting the rotor is denoted by the same reference numeral as in FIG.

  FIG. 6 is a flow showing the work process of the resin 57 injection method. The method of fixing the first and second collars 40 and 41 and the laminated iron core 45 to the rotor sleeve 43 is adhesion.

  First, an adhesive is applied to the inner diameters of the second collar 41 and the laminated iron core 45 and fitted into the rotor sleeve 43, and the permanent magnet 49 is inserted into the slit 47 of the rotor sleeve 43. Finally, an adhesive is applied to the inner diameter of the first collar 40 and inserted into the rotor sleeve 43 to assemble the rotor.

  Next, in order to prevent the resin from protruding from the gap between the laminated iron cores 45 when the resin is injected, the upper end surface 84 and the lower end surface 85 of the collar, which are part of the rotor, are arranged in the upper die 60 and the lower die 66 from the axial direction. Then, the bolt 68 is used to tighten and fix with a predetermined torque so as to eliminate the gap between the laminated cores 45. At this time, the resin flow path 62 of the upper mold 60 is set so as to be at the same position as the resin injection path 54 of the first collar 40. The rotor in which the upper mold 60 and the lower mold 66 are assembled, and the plunger 71 are put into a furnace and heated to a temperature suitable for resin injection, and at the same time, the adhesive is heated and cured so that the first and second collars 40 and 41 and the laminated iron core are heated. 45 is bonded and fixed to the rotor sleeve 43.

  On the other hand, the heated rotor is taken out of the furnace, placed on the lower base 70, the resin 57 is put into the resin reservoir 64, and injected into the rotor by the plunger 71. After the injection, the upper mold 60 and the lower mold 66 are removed and placed in a furnace, and the resin 57 is cured by heating. After curing, the protruding resin 57 is removed to complete the injection.

JP2012-130130A

  According to the above-described conventional method of assembling the rotor, an adhesive is applied to the inner diameters of the first and second collars 40 and 41 and the laminated iron core 45 and fitted into the rotor sleeve 43 to form a part of the rotor. The collar upper end surface 84 and the sleeve lower end surface 85 are sandwiched between the upper die 60 and the lower die 66 from the axial direction, the bolts 68 are tightened and fixed, and the adhesive is heated and cured, and then the resin 57 is injected. Was.

  The tightening torque of the bolt 68 is the lower limit tightening torque at which the resin does not leak to the outside of the rotor when the resin is injected by eliminating the gap between the laminated cores 45, and when the bolt 68 is loosened, The force when the laminated core 45 that has been shrunk is returned by the spring back is made to be within the upper limit tightening torque range in which the load is smaller than the adhesive force between the first collar 40 and the laminated core 45 and the rotor sleeve 43.

  However, according to the conventional method of assembling the rotor, the injection pressure of the resin 57 is directly applied to the first and second collars 40 and 41 and the laminated iron core 45. When 47 is thin or has a large number and requires a large injection pressure, the injection pressure exceeds the adhesive strength of the first collar 40 and the laminated core 45, and the laminated core 45 with the spring element becomes the shaft. There has been a problem that the laminated iron core 45 and the first collar 40 receiving the force in the axial direction are peeled off due to the deflection of the laminated iron core 45 in the direction.

  An assembly method for a rotor of an electric motor according to the present invention is a method for assembling a rotor of an electric motor having an iron core assembly and a rotor sleeve that is inserted into and bonded to the inner periphery of the iron core assembly. The solid body is formed by laminating thin steel plates in the axial direction of the rotor, and is positioned at one end in the axial direction of the laminated iron core provided with a slit extending along the axial direction, and the laminated iron core And a first collar formed with a resin injection port facing the opening of the slit opened at the end face.

  In the method according to the present invention, in order to adjust the load when the rotor assembly in which the rotor sleeve is inserted into the inner periphery of the iron core assembly is clamped by the upper die and the lower die, the axial direction of the iron core assembly is adjusted. Adjusting the dimension or the offset dimension in the axial direction between the surface contacting the upper collar and the surface contacting the upper rotor sleeve. Specifically, the rotor sleeve is not sandwiched between the upper mold and the lower mold when sandwiched by the first load, and the rotor sleeve is sandwiched between the upper mold and the lower mold when sandwiched by the second load. The size of the core assembly or the size of the offset of the upper mold is adjusted so as to be in a state. The first load is the minimum load at which the resin leakage from the gap between the thin steel plates of the laminated iron core is less than the specified amount during the resin injection into the slit, and the second load is between the iron core assembly and the rotor sleeve. It is the maximum load that cannot be peeled off when adhesion is released by the second load.

  In the method according to the present invention, after adjusting the size, the rotor assembly is sandwiched between the upper mold and the lower mold with the second load, and an adhesive that bonds the inner periphery of the core assembly and the rotor sleeve is added. A step of curing, a step of continuing the clamping between the upper die and the lower die, injecting resin into the slit from the resin reservoir in the upper die through the resin injection port, and the resin injected into the rotor assembly Curing.

  The dimension in the axial direction of the iron core assembly can be adjusted, for example, by increasing or decreasing the number of thin steel plates constituting the laminated iron core.

  The dimension of the upper mold offset can be adjusted by, for example, replacing the upper mold with an upper mold having a different offset dimension.

  The dimension of the core assembly in the axial direction can be adjusted, for example, by replacing the first collar with a first collar having a different dimension in the axial direction.

  The size of the offset of the upper mold can be adjusted by, for example, providing a spacer on the surface of the upper mold that contacts the first collar and replacing the spacer with a spacer having a different dimension in the axial direction.

  Furthermore, in order to determine whether the upper sleeve and the lower die sandwich the rotor sleeve, the upper die can be provided with a through hole that opens in a surface that contacts the upper die rotor sleeve and extends in the axial direction. . The distance between the end surface of the rotor sleeve viewed through the through hole and a predetermined position of the upper mold is measured, and it can be determined based on this distance whether the rotor sleeve is sandwiched between the upper mold and the lower mold.

  After the dimension adjustment, the load applied to the iron core assembly is not less than the first load and not more than the second load by sandwiching the rotor assembly with the second load. By applying a load greater than or equal to the first load, resin leakage from between the thin steel plates can be suppressed during resin injection. Further, by making the applied load equal to or less than the second load, it is possible to prevent peeling of the adhesion due to the spring back. Further, at the time of resin injection, since the upper mold and the lower mold sandwich the rotor sleeve, the pressure for resin injection is applied to the rotor sleeve and not to the iron core assembly. For this reason, the shift | offset | difference by the load of a thin steel plate and a 1st color | collar does not generate | occur | produce, but it can prevent that adhesion | attachment remove | deviates.

It is a figure which shows the state which attached the resin injection jig of this embodiment to the rotor of the built-in motor. It is a flowchart which shows the operation | work process of the injection method of resin 57 by embodiment of this invention. It is a flowchart which shows the operation | work process of the injection method of resin 57 by this invention. It is a figure which shows the assembly method of the conventional rotor described in patent document 1. FIG. It is a figure which shows the structure of the rotor of a built-in motor. It is a figure which shows the structure of the rotor of a built-in motor. It is the figure which attached the resin injection jig to the rotor of the built-in motor by a prior art. It is a flowchart which shows the operation | work process of the injection | pouring method of resin 57 by a prior art.

  An embodiment of the present invention will be described. FIG. 1 is a view in which a jig for injecting resin 57 is attached to a rotor of a built-in motor according to the present invention. In contrast to the conventional example shown in FIG. 5, an upper die 80 having a depth measurement hole 82 is attached instead of the upper die 60. The other parts are the same as in the prior art.

The present embodiment will be described using FIG. 1 while comparing with the prior art.
First, an adhesive is applied to the inner diameters of the second collar 41 and the laminated iron core 45 and fitted into the rotor sleeve 43, and the permanent magnet 49 is inserted into the slit 47 of the rotor sleeve 43. Finally, an adhesive is applied to the inner diameter of the first collar 40 and inserted into the rotor sleeve 43 to assemble the rotor assembly.

  The laminated iron core 45 is formed by laminating thin steel plates formed in a predetermined shape by punching or the like in the axial direction of the rotor. Hereinafter, the “axial direction” indicates the axial direction of the rotor in a state where the rotor is assembled. In addition, with respect to each component of the resin injection jig such as the upper mold and the lower mold, the direction parallel to the axial direction of the rotor is the axial direction when attached to the rotor assembly as shown in FIG. .

The thin steel plate has the same shape as the cross section of the laminated iron core 45 shown in FIG. 4B, and is formed with a substantially U-shaped slit as shown. By laminating thin steel plates, a slit 47 extending along the axial direction is formed. The slits 47 are open at both ends of the laminated iron core. The first collar 40 is formed with a resin injection port facing the opening of the slit 47. The resin injection port is an opening of the U-shaped groove 51 and corresponds to the shape of the opening of the slit 47. A resin injection path 54 communicates with the U-shaped groove 51, and the resin injection path 54 opens on a surface facing the upper mold 80. The upper mold 80 is formed with a resin flow path 62 that communicates with the resin injection path 54 of the first collar 40 when the upper mold 80 contacts the first collar 40. The resin flow path 62 is a resin reservoir portion. 64. In the cross section orthogonal to the axial direction, the cross-sectional area of the resin flow path 62 (the sum of the cross-sectional areas of the resin flow paths when there are a plurality of resin flow paths) is smaller than the cross-sectional area of the resin reservoir 64. The second collar 41 is configured to receive the resin injected into the slit 47 of the laminated core 45 at the end opposite to the injection side. The second collar 41 can also be configured integrally with the rotor sleeve 43. That is, a flange may be provided at the lower end of the rotor sleeve 43 in FIG. The whole of the laminated core 45 and the first and second collars 40 and 41 arranged adjacent to the end face in the lamination direction of the laminated core 45 are referred to as “iron core assembly”.
So far, it is the same as the conventional example.

  According to the rotor assembly method of the present embodiment, the first collar upper end surface 84 and the sleeve lower end surface 85, which are part of the rotor, are then sandwiched between the upper mold 80 and the lower mold 66 along the axial direction. The bolt 68 is tightened until the contact portion 86 provided on the upper die 80 contacts the upper end surface 87 of the rotor sleeve, and the tightening torque at the time of contact is between a predetermined lower limit tightening torque and an upper limit tightening torque. The axial dimension between the upper mold 80 and the lower mold 66 was adjusted so as to be in the range. The load acting on the rotor assembly is a function of the tightening torque of the bolt 68. That is, the load acting on the rotor assembly can be managed by managing the tightening torque. According to the prior art shown in FIG. 5, the injection pressure of the resin 57 generated by pushing the plunger 71 is directly applied to the laminated iron core 45, but in this embodiment, the injection pressure of the resin 57 is the rotor sleeve 43. Supported by. Therefore, the injection pressure is not directly applied to the laminated core 45, and the first collar 40, the laminated core 45, and the rotor sleeve 43 can be prevented from being peeled off.

  Note that the setting range of the tightening torque of the bolt 68 is such that the first and second collars 40 and 41 and the laminated iron core 45 are in a state where the contact portion 86 of the upper mold 80 is in contact with the upper surface of the rotor sleeve 43. Depends on whether the load is applied. If the load is weak, gaps are created between the steel plates of the laminated core 45, or between the collars 40, 41 and the laminated core 45, and a large amount of resin leaks when the resin 57 is injected. The load is set so that the resin 57 does not leak from the above or the amount that does not cause a problem when leaked. On the other hand, if the jigs such as the upper die 80 and the lower die 66 are removed from the rotor assembly, the load applied to the laminated core 45 becomes a spring back and works in a direction to peel off the adhesion to the rotor sleeve 43. The upper limit tightening torque is set so as to be the highest load within a range that does not exceed the adhesive strength of the first collar 40 in the axial direction.

  The axial dimension of the upper die 80 and the lower die 66 is adjusted when the tightening torque when the contact portion 86 contacts the rotor sleeve 43 is outside the setting range of the lower limit tightening torque to the upper limit tightening torque. As a method, first, there is a method of adjusting by increasing or decreasing the number of thin steel plates of the laminated core 45 so as to fall within a set range. In addition, a plurality of upper molds 80 having different dimensions H shown in FIG. 1 and a plurality of first and second collars 40 and 41 having different thicknesses are prepared in advance and exchanged so as to fall within the set range. Alternatively, a plurality of ring spacers having different thicknesses may be provided between the pressing portion 88 of the upper mold 80 and the first collar 40, and the thickness may be changed and adjusted. The dimension H is an offset dimension in the axial direction between the surface of the upper mold 80 that contacts the first collar 40 and the surface that contacts the rotor sleeve 43. The means for confirming whether or not the abutting portion 86 has abutted against the rotor sleeve 43 is provided with a depth measuring hole 82 which is a through hole in the upper mold 80. With the bolt 68 tightened, the distance from the opening opposite to the rotor sleeve 43 (upper side in FIG. 1) of the depth measurement hole 82 to the end surface (upper end surface in FIG. 1) of the rotor sleeve 43 is measured. If this distance is the same as the depth of the depth measurement hole 43, it can be determined that the contact portion 86 has contacted the rotor sleeve 43. The position serving as a reference for measuring the distance to the end surface of the rotor sleeve 43 may be other than the opening above the depth measurement hole 82. It is determined whether the upper mold 80 and the lower mold 66 sandwich the rotor sleeve based on the axial distance between the end surface of the rotor sleeve 43 that can be seen through the depth measurement hole 82 and the position where the upper mold is determined. it can.

  Next, a method for injecting the resin 57 will be described in detail with reference to FIGS. 2A and 2B. 2a and 2b are flowcharts showing work steps of the resin 57 injection method. The method of fixing the first and second collars 40 and 41 and the laminated iron core 45 to the rotor sleeve 43 is adhesion. An adjustment method when the tightening torque of the bolt 68 is outside the set range will be described by a method of increasing or decreasing the number of thin steel plates of the laminated core 45.

  First, an adhesive is applied to the inner diameters of the second collar 41 and the laminated iron core 45 and is inserted and fitted into the rotor sleeve 43, and the permanent magnet 49 is inserted into the slit 47 of the rotor sleeve 43. Finally, an adhesive is applied to the inner diameter of the first collar 40 and inserted into the rotor sleeve 43 to assemble the rotor assembly.

  Next, the rotor is sandwiched between the upper die 80 and the lower die 66 from the axial direction, and is fastened and fixed with bolts 68. At this time, the resin injection path 54 of the first collar 40 and the resin flow path 62 of the upper mold 80 are aligned.

  The bolts 68 are tightened with preset lower limit tightening torque and upper limit tightening torque. With the lower limit tightening torque, the contact portion 86 of the upper die 80 does not contact the upper surface of the rotor sleeve 43, and contacts with the upper limit tightening torque. In addition, the number of laminated thin steel plates is adjusted. Whether or not the contact portion 86 of the upper mold 80 is in contact with the upper surface of the rotor sleeve 43 is determined by measuring the distance from the upper surface of the contact portion 86 to the end surface of the rotor sleeve 43 using the depth measurement hole 82. Check. After adjusting the number of thin steel plates, tighten with the upper limit tightening torque.

  The rotor assembly in which the upper mold 80 and the lower mold 66 are assembled and the plunger 71 are placed in a furnace to heat and cure the adhesive and to a temperature suitable for resin injection.

  On the other hand, the heated rotor assembly is taken out of the furnace, placed on the lower base 70, the heated resin 57 is put into the resin reservoir 64, and the resin 57 is injected into the slit of the laminated iron core 45 by the plunger 71. After the injection, the upper mold 80 and the lower mold 66 are removed, and the resin 57 is cured by heating in a furnace. After the curing, the protruding resin 57 is removed to complete the injection.

  In the present embodiment, the upper mold 80 and the lower mold 66 are fastened by a single bolt 68 disposed at the position of the rotor axis, but the bolt is positioned outside the outer periphery of the rotor assembly. You may tighten using the some volt | bolt arrange | positioned so that a load may be applied equally to a rotor assembly. However, in that case, the lower limit tightening torque and the upper limit tightening torque for each bolt are values divided by the number of bolts.

  The means for confirming whether the contact portion 86 of the upper mold 80 is in contact with the upper surface of the rotor sleeve 43 is not necessarily provided with the depth measurement hole 82. Other measurement methods such as measuring the distance to the lower surface of the mold 66 and subtracting the axial length of the rotor sleeve 43 from the value may be used.

  Since the second collar 41 described in this embodiment is not used for length adjustment, it may be fixed to the rotor sleeve 43 by shrink fitting or may be formed integrally with the rotor sleeve 43.

  In addition, in the step of putting the rotor in a furnace after injecting the resin and heat-curing the resin, as described in this embodiment, it is better to remove the upper mold 80 and the lower mold 66 after the resin is cured in the mold. It is good because it hardens and takes less time to remove. However, if a release agent is applied or the like, it takes time, but the resin can be removed. Therefore, the upper mold 80 and the lower mold 66 can be kept in the furnace while being attached.

  In addition, in this embodiment, the adhesive that bonds the iron core assembly and the rotor sleeve 43 has been described as thermosetting. However, the adhesive is not limited to thermosetting, and is a slow-drying agent that does not cure during assembly of the rotor assembly. For example, a room temperature curable type or an anaerobic type may be used. When these adhesives are used, in this embodiment, the rotor assembly assembled with the upper mold 80 and the lower mold 66 is left for a predetermined time before being put into the furnace together with the plunger 71, and the adhesive is removed. It is a step of curing. However, the room temperature curable type has a problem that the adhesive strength is lower than the thermosetting, and the anaerobic type currently has a problem that there is almost no slow-drying type. A curable adhesive is most suitable for fixing the rotor.

  Furthermore, the resin 57 is not limited to a thermosetting resin, and a room temperature curable resin represented by an epoxy resin may be used. In the case of using a room temperature curable resin, there are cases where the process of preheating the upper mold 80 and the lower mold 66 together with the plunger 71 and the process of heating and curing the resin 57 in the furnace may be unnecessary. However, the room temperature curable resin has a problem that the molding shrinkage ratio of the cured product is high and cracks easily occur compared to the thermosetting resin, and the material cost is higher than the thermosetting resin such as an unsaturated polyester resin. Therefore, the thermosetting resin described in this embodiment is most suitable as a resin to be injected into the rotor.

  40, 41 collar, 43 rotor sleeve, 45 laminated iron core, 47 slit, 49 permanent magnet, 51 U-shaped groove, 54 resin injection path, 57 resin, 60 upper mold, 62 resin flow path, 66 lower mold, 68 bolt, 70 Lower base, 71 Plunger, 80 Upper mold, 82 Depth measurement hole.

Claims (6)

A laminated iron core formed by laminating thin steel sheets in the axial direction of the rotor and provided with slits extending along the axial direction, and positioned at one end of the laminated iron core in the axial direction and open to the end face of the laminated iron core An iron core assembly having a first collar formed with a resin inlet facing the opening of the slit.
A rotor sleeve to be inserted into and bonded to the inner periphery of the iron core assembly;
An assembly method for a rotor of an electric motor having
When the rotor assembly in which the rotor sleeve is inserted on the inner periphery of the iron core assembly is clamped in the axial direction by the first and second loads by the upper mold and the lower mold, and the rotor is clamped by the first load The axial direction of the core assembly is such that the sleeve is not sandwiched between the upper mold and the lower mold and the rotor sleeve is sandwiched between the upper mold and the lower mold when sandwiched by the second load. Adjusting the dimension or the offset dimension in the axial direction between the surface contacting the upper mold first collar and the surface contacting the upper rotor sleeve, the first load being resin being injected into the slit The second load is the minimum load at which the resin leakage from the gap between the thin steel plates of the laminated iron core is less than the specified amount. The second load is the adhesion between the iron core assembly and the rotor sleeve and the clamping by the second load is released. Sometimes peeling Not the largest of the load, and the process,
Clamping the rotor assembly with a second load between the upper mold and the lower mold, and curing the adhesive that bonds the inner periphery of the core assembly and the rotor sleeve;
Continuing the sandwiching between the upper mold and the lower mold, and injecting resin into the slit from the resin reservoir in the upper mold through the resin injection port;
Curing the resin injected into the rotor assembly;
A method for assembling a rotor of an electric motor.   2. The method for assembling a rotor of an electric motor according to claim 1, wherein the number of the thin steel plates of the laminated iron core is increased or decreased to adjust the axial dimension of the iron core assembly.   The method for assembling a rotor of an electric motor according to claim 1, wherein the upper die is replaced with an upper die having a different offset size, and the offset size is adjusted.   2. The method for assembling a rotor of an electric motor according to claim 1, wherein the first collar is replaced with a first collar having a different dimension in the axial direction, and the dimension in the axial direction of the iron core assembly is adjusted. .   2. The method of assembling a rotor of an electric motor according to claim 1, wherein a spacer is provided on a surface of the upper die that contacts the first collar, and the spacer is replaced with a spacer having a different dimension in the axial direction. How to adjust dimensions. An assembly method for a rotor of an electric motor according to any one of claims 1 to 5,
The upper die is provided with a through hole that opens in a surface that contacts the rotor sleeve of the upper die and extends in the axial direction.
The state in which the rotor sleeve is sandwiched between the upper mold and the lower mold is determined based on the distance between the end surface of the rotor sleeve viewed through the through hole and a predetermined position of the upper mold.
Method.

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