JP2017189069A - Manufacturing method of armature and resin injection mold, dummy plate, and resin sealing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a manufacturing method of a high versatility armature that is applicable regardless of the type of a steel sheet composing a lamination iron core, the manufacturing method capable of improving a defect of shape of the armature to resolve various problems caused thereby.SOLUTION: In a manufacturing method of an armature in which permanent magnets having negative coefficients of thermal expansion in the non-magnetization direction are inserted, respectively, into multiple magnet insertion holes 61a, ..., 61p formed in a lamination iron core 6, and then resin is injected into the magnet insertion holes 61a, ..., 61p, and solidified therein, thus fixing the permanent magnets to the lamination iron core 6, an amount of resin injected into the magnet insertion holes 61a, ..., 61d, 61i, ..., 61l belonging to a first group is larger than the amount of resin injected into the magnet insertion holes 61e, ..., 61h, 61m, ..., 61p belonging to a second group.SELECTED DRAWING: Figure 6

Description

  The present invention relates to an armature manufacturing method, and a resin injection mold, a dummy plate, and a resin sealing device used in the manufacturing method.

  An armature having a structure in which a permanent magnet is embedded in a laminated iron core, such as a rotor of an IPM motor, is known. Since an IPM motor has a permanent magnet embedded in the rotor core, the magnet does not pop out due to centrifugal force during the rotation of the motor, and the mechanical safety is high. Further, the IPM motor can obtain high torque with high efficiency. Therefore, the use of IPM motors is rapidly expanding in recent years as a power source for automobiles, railway vehicles, and other industries.

  In many cases, the rotor constituting the IPM motor inserts a permanent magnet into each of the magnet insertion holes formed in the laminated iron core, and then injects resin into the magnet insertion holes. The permanent magnets are solidified and fixed to the laminated iron core (Patent Documents 1 and 2). Patent Document 1 describes that after inserting a permanent magnet into a magnet insertion hole of a laminated iron core, the laminated iron core is heated, and then resin is injected into the magnet insertion hole (Nos. 0021 to 0025). Paragraph).

  Further, neodymium (neodymium) magnets are known as permanent magnets embedded in the rotor constituting the IPM motor. A neodymium magnet has a high magnetic flux density and a very strong magnetic force. Therefore, when an IPM motor is configured by embedding a neodymium magnet in a rotor, a small and powerful motor can be obtained.

  A neodymium magnet is known to exhibit a positive coefficient of thermal expansion in the magnetization (easy) direction and a negative coefficient of thermal expansion in the non-magnetization direction (direction orthogonal to the magnetization direction) (Patent Document 3 (No. 0049). Paragraph), Patent Document 4 (paragraph 0005)). That is, it is known that when a neodymium magnet is heated, the neodymium magnet expands in the magnetization direction and contracts in the non-magnetization direction.

  The laminated core is a core obtained by punching a thin steel plate (called an “electromagnetic steel plate” based on its use or a “silicon steel plate” based on its alloy component) produced by a rolling process with a die. It is configured by stacking sheets. The core sheet constituting the rotor has a circular contour. The contour of the mold is also made a perfect circle so that the contour of the core sheet becomes a perfect circle. However, even if a thin steel plate is punched with a mold having a perfect circular outline, the outline of the core sheet may be elliptical. That is, the core sheet may be distorted after punching.

  For example, in paragraph 0007 of Patent Document 5, “in a stator core sheet having a circular outer periphery, the outer diameter dimension increases in the rolling direction of the electromagnetic steel sheet as shown in FIG. 9, and the outer diameter dimension increases in the direction perpendicular to the rolling direction. The outer diameter dimension may decrease in the rolling direction of the electrical steel sheet, and the outer diameter dimension may increase in the direction orthogonal to the rolling direction. "

  Further, when a laminated iron core having a defective shape due to distortion of the core sheet is attached to the housing of the rotating electrical machine, the housing is distorted, and as a result, various problems may occur in the rotating electrical machine. Further, when a laminated iron core having a defective shape is attached by shrink fitting to the housing, a gap is generated between the laminated iron core and the housing in part. Therefore, the contact area between the laminated iron core and the housing is reduced. As a result, the laminated iron core may be insufficiently fixed.

  In order to solve the above-described problem, the invention described in Patent Document 5 sets a position where a portion where the outer diameter dimension of the punched stator core sheet is larger than a normal dimension abuts in the housing of the rotating electrical machine as an unfixed position. The position where the part with a small difference in the outer diameter dimension with respect to the normal dimension abuts is set as the fixed position.

  According to the invention described in Patent Document 5, various problems caused by the mismatch between the shape of the laminated iron core and the housing may be solved. However, the shape defect itself of the laminated iron core is not improved. For this reason, problems caused by defective shape of the laminated core, for example, torque fluctuations and vibration problems caused by fluctuations in the gap (air gap) between the rotor and the stator cannot be solved.

  However, an invention for suppressing the occurrence of a defective shape of the laminated core has already been filed. For example, Patent Document 6 discloses a method for punching a non-oriented electrical steel sheet, wherein the roundness of a cutting blade of a punching die is controlled according to the elongation rate of the non-oriented electrical steel sheet. Yes.

JP 2014-138533 A JP 2014-220911 A JP 2007-273850 A JP 2012-152069 A JP 2009-1112096 A Japanese Patent Laid-Open No. 10-24333

  According to Patent Document 6, it is said that the contour of the core sheet can be made into a perfect circle by controlling the roundness of the cutting blade of the punching die. As a result, it is said that the defective shape of the laminated iron core is eliminated, and the fluctuation of the output torque of the rotating electrical machine is also eliminated. However, Patent Document 6 discloses the roundness of a cutting die of a punching die applied when punching a non-oriented electrical steel sheet containing, by weight%, Si: 4% or less and Al: 2% or less. Although the control formula is disclosed, the control formula in other cases is not disclosed. Therefore, the invention described in Patent Document 6 can be applied when punching the non-oriented electrical steel sheet, but has a problem that it cannot be applied in other cases. That is, when a core sheet is manufactured by punching a steel sheet other than the electromagnetic steel sheet, the invention disclosed in Patent Document 6 cannot eliminate the distortion of the core sheet.

  Therefore, in the invention described in Patent Document 6, the armature constituted by laminating core sheets made of steel sheets other than the above-described electromagnetic steel sheets improves the shape defects and has problems caused by the shape defects. There is a problem that it cannot be solved.

  The present invention has been made in view of such circumstances, and is an armature manufacturing method that can improve a defective shape of an armature and solve various problems caused by the defective shape, and constitutes a laminated core. It aims at providing the manufacturing method of a highly versatile armature which can be applied irrespective of the kind of steel plate to perform.

  In the armature manufacturing method according to the present invention, a permanent magnet having a negative coefficient of thermal expansion in the non-magnetization direction is inserted into each of a plurality of magnet insertion holes formed in the laminated iron core, and then the magnet insertion holes are inserted. In the armature manufacturing method in which resin is injected and solidified in the magnet insertion hole, and the permanent magnet is fixed to the laminated core, the amount of resin injected into another magnet insertion hole in a specific magnet insertion hole Also, a large amount of resin is injected.

  In the above armature manufacturing method, the specific magnet insertion holes may be a group of magnet insertion holes arranged in a direction that forms a specific angle with respect to the rolling direction of the material of the laminated core.

  The above-described armature manufacturing method includes a resin reservoir that temporarily holds the resin injected into the magnet insertion hole and is in contact with the upper or lower surface of the laminated core, and the resin reservoir is advanced and retracted. A resin that is freely attached and includes a plunger that pushes the resin temporarily held in the resin reservoir toward the magnet insertion hole, and a plunger drive mechanism that advances and retracts the plunger with respect to the resin injection mold. You may inject | pour resin into a magnet insertion hole using a sealing device.

  A resin injection mold according to the present invention is a resin injection mold provided in a resin sealing device used in the above-described armature manufacturing method, and injects resin held in a resin reservoir into a magnet insertion hole. In addition to the resin injection port, the cross-sectional area of the resin injection port for injecting the resin into the specific magnet insertion hole is made larger than the cross-sectional area of the other resin injection ports.

  A resin injection mold according to the present invention is a resin injection mold provided in a resin sealing device used in the above-described armature manufacturing method, and a resin held in a special resin reservoir is used as a magnet insertion hole. In addition to the resin injection port for injecting the resin, the cross-sectional area of the resin injection port for injecting resin into a specific magnet insertion hole overlaps with the magnet insertion hole in the planar shape is a magnet in the planar shape of the other resin injection port. It may be larger than the cross-sectional area of the portion overlapping the insertion hole.

  A resin injection mold according to the present invention is a resin injection mold provided in a resin sealing device used in the above-described armature manufacturing method, and holds a resin injected into a specific magnet insertion hole. The cross-sectional area of the resin reservoir may be larger than the cross-sectional areas of other resin reservoirs.

  A dummy plate according to the present invention is a dummy plate that is used by being sandwiched between a resin injection mold and a laminated iron core in the above-described armature manufacturing method, and passes through the dummy plate for resin injection. It has a resin injection hole for pouring the resin extruded from the mold resin reservoir into the magnet insertion hole, and the cross-sectional area of the resin injection hole for pouring resin into the specific magnet insertion hole is larger than the cross-sectional area of other resin injection holes It is what has been.

  A dummy plate according to the present invention is a dummy plate that is used by being sandwiched between a resin injection mold and a laminated iron core in the above-described armature manufacturing method, and passes through the dummy plate for resin injection. The resin injection hole for pouring the resin extruded from the resin reservoir of the mold into the magnet insertion hole, and the cross-sectional area of the portion of the resin injection hole for pouring the resin into the specific magnet insertion hole that overlaps the magnet insertion hole in the planar shape The cross-sectional area of the portion of the other resin injection hole that overlaps the magnet insertion hole in the planar shape may be larger.

  A resin sealing device according to the present invention is a resin sealing device used in the above-described armature manufacturing method, and the plunger driving mechanism has a plurality of plungers attached thereto, and a resin injection mold. When a part of the plunger is in a position taken out from the resin injection mold, the tip of the plunger is the same as the tip of another plunger attached to the presser plate. Compared to the mold for resin injection, it is attached to the holding plate so as to be located.

  The resin sealing device according to the present invention is a resin sealing device used in the above-described armature manufacturing method, wherein a plurality of plungers are attached to the plunger driving mechanism, and the resin sealing device is used for resin injection. A press plate that moves forward and backward with respect to the mold, and a spring element that is attached between the press plate and the plunger and expands and contracts in the forward and backward direction of the press plate, holds resin injected into a specific magnet insertion hole The spring constant of the spring element that attaches the plunger attached to the resin reservoir to the pressing plate may be larger than the spring constant of the other spring elements.

  ADVANTAGE OF THE INVENTION According to this invention, the shape defect of the armature comprised by embedding a permanent magnet in the inside of a laminated iron core can be corrected. As a result, the occurrence of problems such as torque fluctuations in the rotating electrical machine including the armature is suppressed, and the performance of the rotating electrical machine is improved.

It is a top view which shows the structure of the armature manufacturing apparatus used for the manufacturing method of the armature which concerns on embodiment of this invention. It is a front view which shows the structure of the preheating apparatus with which the armature manufacturing apparatus of FIG. 1 is provided. It is a front view which shows the structure of the resin sealing apparatus with which the armature manufacturing apparatus of FIG. 1 is provided. FIG. 4A is a configuration diagram of a laminated core according to an embodiment of the present invention, FIG. 4A is a plan view of the laminated core, and FIG. 4B is a side view of the laminated core. It is explanatory drawing which shows the manufacturing method of the base plate which comprises the laminated iron core which concerns on embodiment of this invention. 1 is a plan view of a laminated core according to a first embodiment of the present invention. It is a top view of the laminated iron core which concerns on the 2nd Embodiment of this invention. It is a top view of the upper model concerning a 3rd embodiment of the present invention. It is a block diagram explaining the mechanism and its effect | action which operate | move the plunger which concerns on the 3rd Embodiment of this invention, Fig.9 (a) shows the state with which the plunger was pulled up out of the resin reservoir, FIG. b) shows the state in which the plunger is pushed into the resin reservoir. It is a top view of the dummy plate which concerns on the 4th Embodiment of this invention. It is a figure which shows the structure and effect | action of an upper mold | type which concerns on the 5th Embodiment of this invention, Comprising: Fig.11 (a) is a top view of an upper mold | type, FIG.11 (b) is a plunger and an upper mold | type. It is explanatory drawing which shows the state pulled up out of the resin reservoir provided. It is explanatory drawing explaining the mechanism and its effect | action which operate | move the plunger which concerns on the 6th Embodiment of this invention, Fig.12 (a) shows the state by which the plunger was pulled up out of the resin reservoir. b) shows the state in which the plunger is pushed into the resin reservoir. It is explanatory drawing explaining the mechanism and its effect | action which operate the plunger which concerns on the 7th Embodiment of this invention, Fig.13 (a) shows the state by which the plunger was pulled up out of the resin reservoir, FIG. b) shows the state in which the plunger is pushed into the resin reservoir. It is a front view which shows the structure of the resin sealing apparatus which concerns on the 8th Embodiment of this invention. It is a top view which shows the shape of the resin injection hole with which the dummy plate which concerns on the 9th Embodiment of this invention is equipped, Comprising: Fig.15 (a) and FIG.15 (b) are the areas of the part which overlaps with a magnet insertion hole, respectively. Indicates different resin injection holes. It is a front view which shows the structure of the resin sealing apparatus which concerns on the 10th Embodiment of this invention. It is a top view which shows the shape of the resin injection hole with which the upper mold | type which concerns on the 10th Embodiment of this invention is equipped, Comprising: Fig.17 (a) and FIG.17 (b) are the areas of the part which overlaps with a magnet insertion hole, respectively. Indicates different resin inlets. FIG. 18A to FIG. 18D are diagrams illustrating the principle of correcting the distortion of the laminated iron core by applying the armature manufacturing method according to each of the embodiments, and FIGS. It is a figure which shows the process performed along a time series. FIG. 19A is an explanatory view showing the principle of correcting the distortion of the laminated core by applying the armature manufacturing method according to each of the above embodiments, and FIG. 19A is a diagram of a resin material filled in the magnet insertion hole. FIG. 19B is a cross-sectional view of the magnet insertion hole when the amount of the resin material filled in the magnet insertion hole is small.

  Hereinafter, the manufacturing method of the armature concerning the embodiment of the present invention is explained in detail, referring to drawings.

(manufacturing device)
FIG. 1 is a plan view showing a configuration of an armature manufacturing apparatus 1 according to an embodiment of the present invention. As shown in FIG. 1, the manufacturing apparatus 1 includes a transport conveyor 2, a preheating device 3, and a resin sealing device 4. Moreover, the manufacturing apparatus 1 is provided with a computer 100, and the conveyor 2, the preheating device 3, and the resin sealing device 4 operate under the control of the computer 100.

(Conveyor)
The transport conveyor 2 is a device that carries the laminated iron core 6 manufactured in an upstream process (not shown) disposed on the left side of the manufacturing device 1 in FIG. 1 and placed on the transport tray 5 into the manufacturing device 1. The laminated iron core 6 that has finished processing in the manufacturing apparatus 1 is carried out by the transport conveyor 2 to a downstream process (not shown) arranged on the right side of the manufacturing apparatus 1 in FIG.

  The laminated iron core 6 carried into the manufacturing apparatus 1 from the upstream process by the conveyor 2 is transferred from the conveyor 2 to the preheating apparatus 3 by a transfer device (not shown). The preheating device 3 is a device that heats the laminated iron core 6 and raises the temperature of the preheating device 3 to a predetermined temperature. The detailed configuration of the preheating device 3 will be described later.

  The laminated iron core 6 that has been heated in the preheating device 3 is returned to the conveyor 2 and transferred from the conveyor 2 to the resin sealing device 4 by another transfer device (not shown). In the resin sealing device 4, the laminated core 6 is filled with resin. The laminated iron core 6 in which the resin filling is completed is taken out from the resin sealing device 4, returned to the transport conveyor 2, and carried out to a downstream process (not shown). The detailed configuration of the resin sealing device 4 will be described later.

(Preheating device)
As shown in FIG. 2, the preheating device 3 includes a lower heating unit 31 on which the transport tray 5 on which the laminated core 6 is placed, and a fixed base 32 that is fixed to the installation location. Lifting means (for example, a jack) 33 for moving the lower heating unit 31 up and down is fixed to the fixed base 32. Further, the preheating device 3 includes an upper heating portion 34 positioned above the laminated core 6 (shown by a broken line in FIG. 2) raised to the upper limit position by the lifting means 33, and a side surrounding the laminated core 6 from the side. Part heating unit 35. The side heating unit 35 is divided into two in the lateral direction, and is configured to be openable and closable by moving the divided part in the horizontal direction (indicated by an arrow in FIG. 2) around the laminated core 6. Each heating part 31, 34, 35 provided in the preheating device 3 is provided with an electric heater (not shown), and the laminated iron core 6 is heated by this electric heater. As described above, the preheating device 3 operates under the control of the computer 100.

(Resin sealing device)
As shown in FIG. 3, the resin sealing device 4 includes a lower die 41 for placing the transport tray 5 on which the laminated core 6 is placed, and an upper die 42 placed on the laminated core 6. ing. A dummy plate 7 is sandwiched between the laminated core 6 and the upper mold 42. That is, the lower surface of the dummy plate 7 is in contact with the upper surface of the laminated core 6, and the upper surface of the dummy plate 7 is in contact with the lower surface of the upper mold 42. The dummy plate 7 is a kind of cover that prevents the resin material 8 injected from the upper mold 42 into the magnet insertion hole 61 of the laminated iron core 6 from spreading on the upper surface of the laminated iron core 6 and adhering to the upper surface of the laminated iron core 6. It is. The dummy plate 7 is also called a cull plate.

  The upper mold 42 is a resin injection mold for injecting the resin material 8 into the magnet insertion hole 61 provided in the laminated iron core 6, and includes the same number of resin reservoirs 43 as the magnet insertion holes 61 provided in the laminated iron core 6. That is, the resin reservoir 43 is arranged in the upper mold 42 so as to correspond one-to-one with the magnet insertion hole 61 provided in the laminated core 6. The resin reservoir 43 is a part that temporarily holds the resin material 8 supplied from a resin supply device (not shown) and injected into the magnet insertion hole 61. A resin injection port 44 is formed on the bottom surface of the resin reservoir 43. The resin material 8 temporarily held in the resin reservoir 43 is injected into the magnet insertion hole 61 of the laminated core 6 through the resin injection port 44.

  Plungers 45 are attached to the resin reservoirs 43 so as to freely advance and retract. The plunger 45 is a member that pushes the resin material 8 temporarily held in the resin reservoir 43 toward the magnet insertion hole 61. The plunger 45 is attached to the holding plate 47 via a spring element 46. The holding plate 47 is configured to be driven by an actuator (for example, an air cylinder) 48 so as to advance and retreat with respect to the upper mold 42. The actuator 48 operates under the control of the computer 100. The spring element 46 is configured to expand and contract in the direction in which the plunger 45 advances and retreats.

  Note that all the plungers 45 included in the upper mold 42 are attached to the pressing plate 47 via spring elements 46. Therefore, when the actuator 48 is operated under the control of the computer 100, all the plungers 45 included in the upper mold 42 advance and retract simultaneously with respect to the resin reservoirs 43.

  A resin injection hole 71 is opened at a portion of the dummy plate 7 that contacts the resin reservoir 43 of the upper mold 42. The resin material 8 temporarily held in the resin reservoir 43 is injected into the magnet insertion hole 61 through the resin injection port 44 and the resin injection hole 71. Note that the permanent magnet 9 is inserted into each magnet insertion hole 61 in the upstream process. The resin material 8 injected into the magnet insertion hole 61 is solidified in the magnet insertion hole 61 to fix the permanent magnet 9 to the laminated core 6.

(Laminated core)
Next, the configuration and structure of the laminated iron core 6 will be described. The laminated iron core 6 is a component that constitutes a rotor of an inner rotor type IPM motor, and is constituted by laminating a plurality of base plates 10 as shown in FIG. As shown in FIG. 4A, the laminated iron core 6 has 16 magnet insertion holes 61 formed therein. The magnet insertion holes 61 are arranged on a circumference centered on the center of the laminated core 6. As described above, the permanent magnet 9 is inserted into the magnet insertion hole 61, and the permanent magnet 9 is fixed in the magnet insertion hole 61 by the resin material 8. Further, a shaft hole 62 penetrating the laminated core 6 is formed at the center of the laminated core 6. A rotation shaft of an IPM motor (not shown) is inserted into the shaft hole 62.

  As shown in FIG. 5, the base plate 10 constituting the laminated iron core 6 is formed by being punched from a strip-shaped blank 11. The blank 11 is manufactured by a rolling mill (not shown), and is supplied to the manufacturing process of the base plate 10 in the form of a coil wound up in a roll shape. The blank 11 is pulled out from a coil (not shown), transferred from left to right in FIG. 5, and sequentially processed. That is, in the first step, the magnet insertion hole 61 is punched from the blank 11, and then the blank 11 is transferred to the second step. In the second step, the shaft hole 62 is punched from the blank 11, and then the blank 11 is transferred to the third step. In the third step, the outer ring 63 is punched from the blank 11, and in the fourth step, the base plate 10 is separated from the blank 11. As described above, since the blank 11 is drawn from the coil wound up in a roll shape, the longitudinal direction of the blank 11 (the left-right direction in FIG. 5) coincides with the rolling direction of the blank 11. Moreover, in the process of laminating the base plates 10, the orientations are aligned so that the rolling directions of the base plates 10 face the same direction. That is, in FIG. 4 (a), when the rolling direction of the base plate 10 is placed in the left-right direction of FIG. 4 (a) in the uppermost layer of the laminated core 6, all the base plates constituting the laminated core 6 are arranged. 10 is placed so that the rolling direction is the left-right direction of FIG.

(First embodiment)
FIG. 6 is a plan view of the laminated core 6 according to the first embodiment. In FIG. 6, each of the 16 magnet insertion holes 61 is appended with a suffix a, b,... P to distinguish each of the magnet insertion holes 61. In the armature manufacturing method according to the first embodiment, the magnet insertion hole 61 provided in the laminated core 6 is divided into two groups. That is, as shown in FIG. 6, the magnet insertion holes 61a,... 61d and the magnet insertion holes 61i,. The magnet insertion holes 61e,... 61h and the magnet insertion holes 61m,. The magnet insertion holes 61 belonging to the first group are arranged in a direction parallel to the rolling direction of the base plate 10 constituting the laminated core 6. The magnet insertion holes 61 belonging to the second group are arranged in a direction orthogonal to the rolling direction of the base plate 10 constituting the laminated core 6.

  In the first embodiment, the amount of the resin material 8 injected into the magnet insertion hole 61 belonging to the first group is larger than the amount of the resin material 8 injected into the magnet insertion hole 61 belonging to the second group. doing. Specific means for adjusting the amount of the resin material 8 injected into the magnet insertion hole 61 will be described later.

(Second Embodiment)
The armature manufacturing method according to the present invention is not limited to the method of dividing the plurality of magnet insertion holes 61 into two groups. The plurality of magnet insertion holes 61 may be divided into three or more groups. Therefore, in the second embodiment, as shown in FIG. 7, the 16 magnet insertion holes 61 are divided into three groups. That is, the magnet insertion holes 61b, 61c, 61j, 61k are in the first group, the magnet insertion holes 61d, 61e, 61h, 61i, 61l, 61m, 61p, 61a are in the second group, and the magnet insertion holes 61f, 61g, 61n, 61o. To the third group.

  In the second embodiment, the amount of the resin material 8 injected into the magnet insertion hole 61 belonging to the first group is the largest, and the amount of the resin material 8 injected into the magnet insertion hole 61 belonging to the second group. However, following this, the amount of the resin material 8 injected into the magnet insertion holes 61 belonging to the third group is minimized.

(Third embodiment)
A specific means for adjusting the amount of the resin material 8 injected into the magnet insertion hole 61 will be described. FIG. 8 is a plan view of the upper mold 42 used in the third embodiment. As shown in FIG. 8, the upper mold 42 includes resin reservoirs 43 at positions corresponding to the 16 magnet insertion holes 61 provided in the laminated core 6. Resin injection ports 44 (44a, 44b) are formed at the bottom of each resin reservoir 43, respectively. That is, the upper mold 42 includes 16 resin injection ports 44 (44a, 44b). Further, as shown in FIG. 8, the cross-sectional areas of the 16 resin injection ports 44 (44a, 44b) are not unified. The cross-sectional area of some resin injection ports 44 (44a) is made larger than the cross-sectional area of the other resin injection ports 44 (44b).

  Next, the principle by which the amount of the resin material 8 injected into the magnet insertion hole 61 is increased or decreased by the upper mold 42 shown in FIG. As shown in FIG. 9A, the resin reservoir 43a and the resin reservoir 43b, and the plunger 45a and the plunger 45b have the same shape and the same size. Also. A spring element 46a and a spring element 46b are attached between the plunger 45a and the plunger 45b and the holding plate 47, respectively. These are also the same shape and size, and their spring constants are also equal to each other. Further, the amounts of the resin material 8 held in the resin reservoir 43a and the resin reservoir 43b are also equal to each other. On the other hand, as described above, the cross-sectional area of the resin injection port 44a is larger than the cross-sectional area of the resin injection port 44b.

  Under such conditions, when the actuator 48 (not shown) in FIG. 9A is operated and the presser plate 47 is lowered (approaching the upper die 42), the plunger 45a and the plunger 45b are moved upward. Reaction force acts. This reaction force includes resistance when the resin material 8 pushed by the plunger 45a and the plunger 45b passes through the resin injection port 44a and the resin injection port 44b. Since the cross-sectional area of the resin injection port 44a is larger than the cross-sectional area of the resin injection port 44b, the resistance when the resin material 8 passes through the resin injection port 44a is the resistance when the resin material 8 passes through the resin injection port 44b. Smaller than. Therefore, the reaction force that the plunger 45 a receives from the resin material 8 is smaller than the reaction force that the plunger 45 b receives from the resin material 8. Therefore, the contraction of the spring element 46a that occurs when the plunger 45a is pushed into the resin injection port 44a is smaller than the contraction of the spring element 46b that occurs when the plunger 45b is pushed into the resin injection port 44b. As a result, the plunger 45b is pushed into the resin injection port 44b later than the plunger 45a. That is, as shown in FIG. 9B, when the plunger 45a contacts the bottom surface of the resin reservoir 43a, the plunger 45b does not contact the bottom surface of the resin reservoir 43b. Therefore, at this timing, the resin material 8 remains in the resin reservoir 43b. Accordingly, the resin material injected from the resin reservoir 43a into the magnet insertion hole 61 (not shown in FIG. 9) from the state shown in FIG. 9A to the state shown in FIG. 9B. The amount of 8 is larger than the amount of the resin material 8 injected into the magnet insertion hole 61 from the resin reservoir 43b. Thus, if the cross-sectional areas of the resin injection ports 44 (44a, 44b) are different from each other, the amounts of the resin material 8 injected from the resin reservoir 43 (43a, 43b) into the magnet insertion hole 61 are different from each other. Can do. That is, the amount of the resin material 8 injected into the magnet insertion hole 61 can be adjusted by adjusting the cross-sectional area of the resin injection port 44.

(Fourth embodiment)
The amount of the resin material 8 injected into the magnet insertion hole 61 can also be adjusted by adjusting the cross-sectional area of the resin injection hole 71 provided in the dummy plate 7 instead of adjusting the cross-sectional area of the resin injection port 44. it can. FIG. 10 is a plan view of the dummy plate 7 used in the fourth embodiment. As shown in FIG. 10, the dummy plate 7 includes 16 resin injection holes 71 (71 a, 71 b) at positions corresponding to the 16 magnet insertion holes 61 provided in the laminated core 6. Further, as shown in FIG. 10, the cross-sectional areas of the 16 resin injection holes 71 (71a, 71b) are not unified. The cross-sectional areas of some resin injection holes 71 (71a) are larger than the cross-sectional areas of other resin injection holes 71 (71b). Also in this case, the amount of the resin material 8 injected into the magnet insertion hole 61 is increased or decreased by the same mechanism as that in the third embodiment.

(Fifth embodiment)
Specific means for adjusting the amount of the resin material 8 injected into the magnet insertion hole 61 is not limited to those shown in the third and fourth embodiments. The amount of the resin material 8 injected into the magnet insertion hole 61 can also be increased or decreased by adjusting the cross-sectional area of the resin reservoir 43 provided in the upper mold 42. FIG. 11A is a plan view of the upper mold 42 used in the fifth embodiment. Similarly to the upper mold 42 according to the third embodiment, the upper mold 42 according to the fifth embodiment has 16 resin reservoirs 43 at positions corresponding to the 16 magnet insertion holes 61 provided in the laminated core 6. (43a, 43b). Similarly to the third embodiment, a resin injection port 44 is formed at the bottom of each resin reservoir 43 (43a, 43b). However, in the case of the fifth embodiment, as shown in FIG. 11A, the cross-sectional areas of the 16 resin reservoirs 43 (43a, 43b) are not unified. The cross-sectional area of some resin reservoirs 43 (43a) is larger than the cross-sectional area of other resin reservoirs 43 (43b). As a result, the volume of some resin reservoirs 43 (43a) is made larger than the volume of other resin reservoirs 43 (43b).

  As shown in FIG. 11B, in the fifth embodiment, the holding plate 47 is provided with a plunger 45a having a size corresponding to the resin reservoir 43a and a plunger 45b having a size corresponding to the resin reservoir 43b. It has been. In FIG. 11B, the actuator 48 (not shown) is operated to lower the holding plate 47 (closer to the upper mold 42) so that the lower end of the plunger 45a is on the bottom surface of the resin reservoir 43a and the lower end of the plunger 45b is resin. When they are brought into contact with the bottom surfaces of the reservoirs 43b, the entire amount of the resin material 8 held in the resin reservoirs 43a and 43b is pushed out below the upper mold 42. As described above, since the volume of the resin reservoir 43a is larger than the volume of the resin reservoir 43b, the amount of the resin material 8 pushed out from the resin reservoir 43a is the resin material injected into the magnet insertion hole 61 pushed out from the resin reservoir 43b. More than the amount of 8. Thus, the amount of the resin material 8 injected into the magnet insertion hole 61 can also be adjusted by adjusting the cross-sectional area of the resin reservoir 43.

(Sixth embodiment)
Next, when the plunger 45 is in a position where it is taken out from the upper mold 42, the distal ends of some of the plungers 45 are closer to the upper mold 42 than the distal ends of the other plungers 45. It shows that the quantity of the resin material 8 inject | poured into the magnet insertion hole 61 can be adjusted by comprising in this way. In 6th Embodiment, as shown to Fig.12 (a), the length of the plunger 45 (45a, 45b) is not unified. The plunger 45a pushed into the resin reservoir 43a is longer than the plunger 45b pushed into the resin reservoir 43b. Therefore, in FIG. 12A, the lower end of the plunger 45a is closer to the upper mold 42 than the lower end of the plunger 45b. Therefore, when the actuator 48 (not shown) in FIG. 12A is operated to lower the presser plate 47, the lower end of the plunger 45a comes into contact with the bottom surface of the resin reservoir 43a as shown in FIG. At this time, the lower end of the plunger 45b does not reach the bottom surface of the resin reservoir 43b. If the lowering of the holding plate 47 is stopped before the lower end of the plunger 45b comes into contact with the bottom surface of the resin reservoir 43b, the amount of the resin material 8 pushed out from the resin reservoir 43b is the amount of the resin material 8 pushed out from the resin reservoir 43a. Less than the amount.

(Seventh embodiment)
The resin material 8 injected from the resin reservoir 43 into the magnet insertion hole 61 can also be increased or decreased by adjusting the spring constant of the spring element 46 interposed between the pressing plate 47 and the plunger 45. In the seventh embodiment, as shown in FIG. 13A, the spring element 46a is disposed between the presser plate 47 and the plunger 45a, and the spring element 46b is disposed between the presser plate 47 and the plunger 45b. In this case, the spring constant of the spring element 46a is larger than the spring constant of the spring element 46b. In this case, when the presser plate 47 is pushed down (closed to the upper mold 42) and the plunger 45a and the plunger 45b are pushed into the resin reservoir 43a and the resin reservoir 43b, the plunger 45a and the plunger 45b become the resin material 8 Receive reaction force from. As described above, the spring element 46b has a smaller spring constant than the spring element 46a. At this time, the spring element 46b contracts more than the spring element 46a. Therefore, as shown in FIG. 13B, the plunger 45a first comes into contact with the bottom of the resin reservoir 43a. At the timing shown in FIG. 13B, since the plunger 45b is not in contact with the bottom of the resin reservoir 43b, part of the resin material 8 remains inside the resin reservoir 43b. On the other hand, no resin material 8 remains in the resin reservoir 43a. Accordingly, by the timing shown in FIG. 13B, the amount of the resin material 8 injected into the magnet insertion hole 61a is larger than the amount of the resin material 8 injected into the magnet insertion hole 61b. And if plunger 45b contact | abuts to the bottom part of the resin reservoir 43b, if the downward movement of the press board 47 is stopped and injection | pouring of the resin material 8 is complete | finished, the quantity of the resin material 8 inject | poured into the magnet insertion hole 61a Can be made larger than the amount of the resin material 8 injected into the magnet insertion hole 61b.

(Eighth embodiment)
In each of the above embodiments, an example is shown in which the bottom surface of the resin reservoir 43 of the upper mold 42 is provided with the resin inlet 44 smaller in cross-sectional area than the bottom surface (FIGS. 3 and 8). However, the shapes of the resin reservoir 43 and the resin injection port 44 are not limited to these. As shown in FIG. 14, the cross-sectional areas of the resin reservoir 43 and the resin injection port 44 may be the same shape and the same size. That is, the resin reservoir 43 is configured to penetrate the upper mold 42 so that the cross-sectional shape of the resin reservoir 43 on the upper surface of the upper mold 42 is equal to the cross-sectional shape of the resin reservoir 43 on the lower surface of the upper mold 42. good.

(Ninth embodiment)
In the said 4th Embodiment, it showed adjusting the quantity of the resin material 8 inject | poured into the magnet insertion hole 61 by adjusting the cross-sectional area of the resin injection hole 71 with which the dummy plate 7 is provided. 10 shows an example in which the cross-sectional area of the resin injection hole 71a is larger than the cross-sectional area of the resin injection hole 71b. However, even if the cross-sectional area of the resin injection hole 71 is the same, the resin material 8 injected into the magnet insertion hole 61 can be adjusted by adjusting the area of the resin injection hole 71 that overlaps the magnet insertion hole 61 in the planar shape. The amount of can be adjusted. For example, as shown in FIGS. 15A and 15B, the resin injection hole 71a and the resin injection hole 71b have the same cross-sectional shape, while the magnet insertion hole 61 of the resin injection hole 71a has a planar shape. The area of the overlapping portion (the hatched portion in FIG. 15A) is different from the area of the portion overlapping the magnet insertion hole 61 of the resin injection hole 71b (the hatched portion in FIG. 15B). May be. Even when such a configuration is selected, the same operations and effects as those of the third embodiment are produced.

(Tenth embodiment)
In each said embodiment, although the example which sandwiches the dummy plate 7 between the upper mold | type 42 and the laminated iron core 6 was shown, the dummy plate 7 is not an essential component. The dummy plate 7 can also be omitted. For example, as shown in FIG. 16, the upper mold 42 may be placed directly on the upper surface of the laminated iron core 6. Further, the resin injection port 44 is not limited to one having a cross-sectional area equal to that of the resin reservoir 43 or smaller than that of the resin reservoir 43. As shown in FIG. 16, the resin injection port 44 may have a cross-sectional area larger than that of the resin reservoir 43.

  Further, in the resin sealing device 4 according to the tenth embodiment, that is, the resin sealing device 4 shown in FIG. 16, the area of the portion of the resin injection port 44 that overlaps the magnet insertion hole 61 in the planar shape is adjusted. Thus, the amount of the resin material 8 injected into the magnet insertion hole 61 is adjusted. For example, as shown in FIGS. 17 (a) and 17 (b), when the resin injection port 44a and the resin injection port 44b are planar, the areas of the portions overlapping the magnet insertion holes 61 (FIGS. 17A and 17B). If the hatched portions in b) are different, the same operations and effects as in the third embodiment are produced.

(Correction of shape defects)
Finally, with reference to FIGS. 18 and 19, the principle of correcting the shape defect of the laminated iron core 6 by the method according to the first to seventh embodiments will be described. FIG. 18A is a plan view showing the shapes of the magnet insertion hole 61 and the permanent magnet 9 of the laminated iron core 6 at room temperature. The permanent magnet 9 is a neodymium magnet and has different easy magnetization performance depending on the direction. 18, the X axis indicates the magnetization (easy) axis of the permanent magnet 9, and the Y axis indicates the non-magnetization axis of the permanent magnet 9. That is, the permanent magnet 9 is disposed in the magnet insertion hole 61 so that the magnetization (easy) axis coincides with the X axis and the non-magnetization axis coincides with the Y axis. The neodymium magnet, that is, the permanent magnet 9 has a positive coefficient of thermal expansion in the magnetization axis (X-axis) direction and a negative coefficient of thermal expansion in the non-magnetization axis (Y-axis) direction. . Therefore, when the permanent magnet 9 is heated, the permanent magnet 9 expands in the X-axis direction and contracts in the Y-axis direction.

  FIG. 18B is a plan view showing the shapes of the magnet insertion hole 61 and the permanent magnet 9 when the laminated core 6 is heated. In this case, the magnet insertion hole 61 expands in the X-axis and Y-axis directions (the dimension increases). The permanent magnet 9 expands (size increases) in the X-axis direction and contracts (size decreases) in the Y-axis direction. As a result, the gap between the magnet insertion hole 61 and the permanent magnet 9 is enlarged. In particular, the gap in the Y-axis direction is enlarged.

  In this way, when the resin material 8 is injected into the magnet insertion hole 61 in a state where the laminated iron core 6 is heated, the resin is inserted into the gap between the magnet insertion hole 61 and the permanent magnet 9 as shown in FIG. Material 8 is filled.

  After injecting the resin material 8 into the magnet insertion hole 61, the laminated iron core 6 is cooled, and the temperature of the laminated iron core 6 is returned to room temperature, the resin filled in the gap between the magnet insertion hole 61 and the permanent magnet 9. The material 8 is solidified. At this time, the magnet insertion hole 61 contracts in the X-axis and Y-axis directions (the size is reduced). The permanent magnet 9 contracts (the size is reduced) in the X-axis direction and expands (the size is expanded) in the Y-axis direction. That is, the magnet insertion hole 61 and the permanent magnet 9 try to return to the shape shown in FIG. However, as shown in FIG. 18 (d), since the resin material 8 is filled in the gap between the magnet insertion hole 61 and the permanent magnet 9, the magnet insertion hole 61 extends from the inside in the Y-axis direction. Pressed. As a result, the length in the Y-axis direction of the magnet insertion hole 61 in the state shown in FIG. 18D is larger than the length in the state shown in FIG. In FIG. 18D, a thick solid line with an arrow indicates a pressing force acting on the magnet insertion hole 61 at this time.

  If the amount of the resin material 8 injected into the magnet insertion hole 61 is large, the amount of the resin material 8 filled between the magnet insertion hole 61 and the permanent magnet 9 is large as shown in FIG. Become. The resin material 8 acts as a spring between the magnet insertion hole 61 and the permanent magnet 9. However, if the amount of the resin material 8 filled between the magnet insertion hole 61 and the permanent magnet 9 is large, the spring constant increases. . If the spring constant is large, when the permanent magnet 9 is cooled to room temperature after the resin material 8 is filled, the dimension in the Y-axis direction of the permanent magnet 9 returns to the original (that is, the state shown in FIG. 18D). The pressing force acting on the magnet insertion hole 61 is increased.

  On the other hand, if the amount of the resin material 8 injected into the magnet insertion hole 61 is small, the amount of the resin material 8 filled between the magnet insertion hole 61 and the permanent magnet 9 is small as shown in FIG. Become. If the amount of the resin material 8 filled between the magnet insertion hole 61 and the permanent magnet 9 is small, the spring constant of the spring acting between the magnet insertion hole 61 and the permanent magnet 9 in the resin material 8 becomes small. If the spring constant is small, the permanent magnet 9 is cooled to room temperature after the resin material 8 is filled, and when the dimension of the permanent magnet 9 in the Y-axis direction returns to the original state (that is, the state shown in FIG. 18D), The pressing force acting on the magnet insertion hole 61 is reduced.

  Thus, if the amount of the resin material 8 injected into the magnet insertion hole 61 is adjusted, the pressing force acting on the magnet insertion hole 61 after the resin material 8 is solidified is adjusted. If the pressing force acting on the magnet insertion hole 61 is increased, the magnet insertion hole 61 is greatly expanded. If the pressing force acting on the magnet insertion hole 61 is small, the expansion of the magnet insertion hole 61 is limited. And using this phenomenon, the shape defect of the laminated iron core 6 can be corrected. That is, the injection amount of the resin material 8 into the magnet insertion hole 61 at a position where the dimension in the Y-axis direction is to be greatly enlarged is made larger than the injection amount of the resin material 8 into the magnet insertion hole 61 at another position. The shape of the iron core 6 can be corrected.

  For example, in the first embodiment, the magnet insertion hole 61 belonging to the first group has a relatively large size in the Y-axis direction after the resin material 8 is solidified. The amount of expansion of the dimension in the Y-axis direction of the magnet insertion hole 61 belonging to the second group after the resin material 8 is solidified is smaller than that of the magnet insertion hole 61 belonging to the first group. Also in the second embodiment, the magnet insertion hole 61 belonging to the first group has the largest dimension in the Y-axis direction after the resin material 8 is solidified. The amount of enlargement of the dimension in the Y-axis direction of the magnet insertion hole 61 belonging to the second group after the resin material 8 is solidified is the second largest after the first group. The amount of expansion of the dimension in the Y-axis direction of the magnet insertion hole 61 belonging to the third group after the resin material 8 is solidified is the smallest.

  As described above, according to the embodiment of the present invention, it is possible to correct the shape defect of the armature constituted by embedding the permanent magnet 9 in the laminated core 6. As a result, the occurrence of problems such as torque fluctuations in the rotating electrical machine including the armature is suppressed, and the performance of the rotating electrical machine is improved. Moreover, the manufacturing method of the armature which concerns on the said embodiment is applicable regardless of the kind of steel plate which comprises a laminated iron core.

  However, the technical scope of the present invention is not limited by the above embodiment. The present invention can be freely modified, applied or improved within the scope of the technical idea described in the claims.

  For example, the unit for changing the injection amount of the resin material 8 is not limited to the “group of magnet insertion holes 61”. The injection amount of the resin material 8 may be changed for each magnet insertion hole 61. Further, the number of the magnet insertion holes 61 constituting the “group” is also arbitrary.

  In the first embodiment, as a specific example of “a direction that forms a specific angle with respect to the rolling direction of the material of the laminated core 6”, “a direction parallel to the rolling direction of the base plate 10” and “element The direction perpendicular to the rolling direction of the plate 10 is exemplified. However, the “direction forming a specific angle” is not limited to the “parallel direction” or the “perpendicular direction”. The “specific angle” can be arbitrarily selected.

  Specific means for adjusting the amount of the resin material 8 injected into the magnet insertion hole 61 is not limited to those shown in the third to seventh embodiments. A dedicated actuator 48 may be provided for each of the plurality of plungers 45, and the thrust and operation stroke of the actuator 48 may be controlled and changed by the computer 100. Alternatively, the plurality of plungers 45 are divided into a plurality of “groups”, and a dedicated actuator 48 is provided in each “group”, and the thrust and operation stroke of the actuator 48 are controlled and changed by the computer 100. Anyway.

  In the said embodiment, the resin sealing apparatus 4 is equipped with the press board 47 and the actuator 48 one each, and the example in which all the plungers 45 with which the resin sealing apparatus 4 is provided is attached to the single press board 47 is shown. However, the technical scope of the present invention is not limited to those using such an apparatus. The resin sealing device 4 may include a plurality of sets of pressing plates 47 and actuators 48. Alternatively, the plurality of plungers 45 included in the resin sealing device 4 may be divided into a plurality of “groups”, and each “group” may be provided with a set of a dedicated pressing plate 47 and an actuator 48.

  In the above embodiment, an example in which the upper mold 42 is a resin injection mold has been described. However, the technical scope of the present invention is not limited to the one in which the upper mold 42 is a resin injection mold. The lower mold 41 may be provided with a resin reservoir 43 or the like so that the lower mold 41 functions as a resin injection mold. That is, the resin material 8 may be injected from the lower surface of the laminated core 6.

  The mechanical configurations and structures of the upper mold 42, the dummy plate 7, and the plunger 45 exemplified in the above embodiments are examples. For example, the number, shape and arrangement of the resin reservoirs 43 provided in the upper mold 42, the number, shape and arrangement of the resin injection holes 71 provided in the dummy plate 7, and the shape of the plunger 45 are examples. The shape of the spring element 46 is also exemplary. The mechanical configuration and structure of the laminated iron core 6 are also examples. Therefore, the technical scope of the present invention is not limited by these. For example, the dummy plate 7 is not limited to a single disk as shown in FIG. The dummy plate 7 may be divided for each of one or a plurality of adjacent magnet insertion holes 61. A plurality of dummy plates 7 may be stacked one above the other and sandwiched between the upper mold 42 and the laminated iron core 6. In the fifth and sixth embodiments, the spring element 46 is an optional component. In the fifth and sixth embodiments, the plunger 45 may be directly attached to the holding plate 47 without using the spring element 46.

  In the sixth embodiment, the example in which the distance between the tip of the plunger 45 and the upper mold 42 is adjusted by changing the length of the plunger 45 has been described. However, the distance between the tip of the plunger 45 and the upper mold 42 is shown. This adjustment may be realized by interposing a separate part between the plunger 45 and the spring element 46. For example, an adapter may be interposed between the plunger 45 and the spring element 46 to extend the substantial length of the plunger 45.

  In the above embodiment, a neodymium magnet is exemplified as a specific example of “a permanent magnet having a negative thermal expansion coefficient in the non-magnetization direction”, but “a permanent magnet having a negative thermal expansion coefficient in the non-magnetization direction” is a neodymium magnet. Is not limited. The present invention is widely applied to the manufacture of an armature provided with a “permanent magnet having a negative coefficient of thermal expansion in the non-magnetization direction” that currently exists or will appear in the future.

  In the above embodiment, the rotor of the IPM motor is illustrated as a specific example of the armature. However, the armature to which the present invention is applied is not limited to the rotor of the IPM motor. The armature to which the present invention is applied may be a stator, or a rotor or a stator provided in a motor other than the IPM motor. The armature to which the present invention is applied is not limited to the armature that constitutes the motor. The present invention is also applied to the manufacture of an armature constituting a generator.

DESCRIPTION OF SYMBOLS 1 Manufacturing apparatus 2 Conveyor 3 Preheating apparatus 4 Resin sealing apparatus 5 Conveying tray 6 Laminated core 7 Dummy plate 8 Resin material 9 Permanent magnet 10 Base plate 11 Blank 31 Lower heating part 32 Fixed stand 33 Lifting means 34 Upper heating part 35 side Part heating unit 41 Lower mold 42 Upper mold 43, 43a, 43b Resin reservoir 44, 44a, 44b Resin inlet 45, 45a, 45b Plunger 46, 46a, 46b Spring element 47 Holding plate 48 Actuator 61 Magnet insertion hole 61a,. 61p Magnet insertion hole 62 Shaft hole 63 Outer rings 71, 71a, 71b Resin injection hole 100 Computer

Claims (10)

A permanent magnet having a negative coefficient of thermal expansion in the non-magnetization direction is inserted into each of the plurality of magnet insertion holes formed in the laminated iron core, and then a resin is injected into the magnet insertion hole, whereby the magnet insertion hole In the manufacturing method of the armature that is solidified inside and fixes the permanent magnet to the laminated core,
Injecting a larger amount of the resin into the specific magnet insertion hole than the amount of the resin injected into the other magnet insertion hole,
The manufacturing method of an armature. The specific magnet insertion holes are a group of the magnet insertion holes arranged in a direction that forms a specific angle with respect to the rolling direction of the material of the laminated core.
The armature manufacturing method according to claim 1. A resin injection mold that includes a resin reservoir that temporarily holds the resin injected into the magnet insertion hole and is in contact with an upper surface or a lower surface of the laminated core;
A plunger that is attached to the resin reservoir so as to freely advance and retract, and that pushes the resin temporarily held in the resin reservoir toward the magnet insertion hole;
A plunger drive mechanism for moving the plunger forward and backward with respect to the resin injection mold,
Injecting the resin into the magnet insertion hole using a resin sealing device comprising:
The manufacturing method of the armature of Claim 1 or Claim 2. A resin injection mold provided in a resin sealing device used in the armature manufacturing method according to claim 3,
A resin injection port for injecting the resin held in the resin reservoir into the magnet insertion hole;
The cross-sectional area of the resin injection port for injecting the resin into the specific magnet insertion hole is larger than the cross-sectional area of the other resin injection port,
Mold for resin injection. A resin injection mold provided in a resin sealing device used in the armature manufacturing method according to claim 3,
A resin injection port for injecting the resin held in the resin reservoir into the magnet insertion hole;
The cross-sectional area of the portion of the resin injection port that injects the resin into the specific magnet insertion hole overlaps with the magnet insertion hole in the planar shape overlaps with the magnet insertion hole in the planar shape of the other resin injection port. Is larger than the cross-sectional area of the part,
Mold for resin injection. A resin injection mold provided in a resin sealing device used in the armature manufacturing method according to claim 3,
The cross-sectional area of the resin reservoir that holds the resin injected into the specific magnet insertion hole is larger than the cross-sectional area of the other resin reservoirs,
Mold for resin injection. The armature manufacturing method according to claim 3, wherein the dummy plate is used by being sandwiched between the resin injection mold and the laminated iron core,
A resin injection hole that penetrates the dummy plate and flows the resin pushed out of the resin reservoir of the resin injection mold into the magnet insertion hole,
The cross-sectional area of the resin injection hole for pouring the resin into the specific magnet insertion hole is larger than the cross-sectional area of the other resin injection hole,
Dummy plate. The armature manufacturing method according to claim 3, wherein the dummy plate is used by being sandwiched between the resin injection mold and the laminated iron core,
A resin injection hole that penetrates the dummy plate and flows the resin pushed out of the resin reservoir of the resin injection mold into the magnet insertion hole,
The portion of the resin injection hole that pours the resin into the specific magnet insertion hole in a plane shape that overlaps with the magnet insertion hole in the plane shape is the portion of the other resin injection hole that overlaps the magnet insertion hole in the plane shape Is larger than the cross-sectional area of
Dummy plate. A resin sealing device used in the armature manufacturing method according to claim 3,
The plunger drive mechanism includes a pressing plate to which a plurality of the plungers are attached and which advances and retreats with respect to the resin injection mold,
When a part of the plunger is located at a position taken out from the resin injection mold, the tip of the plunger is compared with the tip of the other plunger attached to the pressing plate. It is attached to the holding plate so that it is located close to the mold,
Resin sealing device. A resin sealing device used in the armature manufacturing method according to claim 3,
In the plunger drive mechanism,
A plurality of the plungers are attached, and a pressing plate that moves forward and backward with respect to the resin injection mold,
A spring element attached between the pressing plate and the plunger and extending and retracting in the advancing and retreating direction of the pressing plate;
A spring constant of the spring element for attaching the plunger attached to the resin reservoir in which the resin injected into the specific magnet insertion hole is held to the holding plate is larger than the spring constant of the other spring elements. Being
Resin sealing device.

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