JP2010119260A - Rotor-laminated core and method of manufacturing the rotor-laminated iron core - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To obtain a rotor-laminated core that reduces the deterioration of the shape accuracy and degradation of magnetic characteristics generated by fixing core sheets by die-cutting caulking, rivet pins or crank pins and die casting, allowing manufacture, at low cost and having superior recyclability, and to obtain a method of manufacturing the rotor-laminated iron core. <P>SOLUTION: The rotor-laminated core is formed by laminating a plurality of core sheets, and provided with a through-hole for a rotary shaft in the center thereof; a plurality of through-holes for positioning the core sheets, into which the rivet pins are inserted, are provided between the through-hole for the rotary shaft of the rotor-laminated iron core and the outer periphery thereof; and the rotor-laminated core is fixed, by fixing and adhering the core sheets with a thermoplastic resin material arranged and installed around the rivet pins inserted into these through-holes. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a rotor laminated core that is one of the components of a rotating electrical machine and a method for manufacturing the same, and more particularly to a rotor laminated core used for a rotor having a permanent magnet and a method for manufacturing the same.

Conventionally, as a rotating electrical machine for driving a compressor such as an air conditioner or a refrigerator, there is a permanent magnet embedded type rotating electrical machine {(Internal Permanent Magnet Motor) IPM motor} using a rotor embedded with a permanent magnet.
The IPM motor is composed of a cylindrical stator having a coil wound around a plurality of teeth projecting in the center of the circle, and a rotor arranged to be rotatable via a tooth tip and a slight gap. The rotor is a rotor laminated core provided with a permanent magnet and a hole into which the permanent magnet is inserted in the outer peripheral region, and a rotating shaft fixed by press-fitting or shrink-fitting into a hole in the center of the rotor laminated core. It consists of.

The rotor laminated iron core constituting the rotor of the IPM motor has, for example, a hole (referred to as a permanent magnet insertion hole) into which the permanent magnet is inserted in the outer peripheral region, and the permanent magnet insertion hole and the rotation shaft are inserted and fixed. In some cases, each core sheet provided with a caulking portion is joined and laminated via the caulking portion between the holes. This is a rotor laminated iron core formed by a fixing method of caulking after forming cores on a magnetic steel sheet and then caulking core sheets while blanking in a blank process (see, for example, Patent Document 1).
In addition, a communication hole constituted by a through hole of each core sheet of a laminated body formed by laminating a core sheet provided with a through hole between a permanent magnet insertion hole and a hole into which the rotation shaft is inserted and fixed There is a rotor laminated iron core in which a rivet pin is inserted and a core sheet is fixed (see, for example, Patent Document 2).

As a motor having a permanent magnet on a rotor, there is an SPM (Surface Permanent Magnet) motor having a structure in which a permanent magnet is bonded to the outer periphery of a rotor laminated core. In particular, some SPM motors are provided with a cylindrical cover outside the permanent magnet in order to prevent troubles such as scattering of the permanent magnet and contact with the stator core due to centrifugal force generated when the rotor rotates. .
The rotor laminated core of the SPM motor provided with a cylindrical cover outside the permanent magnet is provided with a through hole in each core sheet to be laminated, and a communication hole constituted by the through hole. The molten iron is passed through the communication hole, and the laminated iron core is die-cast.
Moreover, there exists what fixed the lamination | stacking iron core through the clamp pin to the communicating hole of the rotor lamination | stacking iron core instead of die-casting (for example, refer patent document 3).

JP 2004-173375 A (page 4) JP 2000-069717 A (page 3) Japanese Patent Laid-Open No. 02-246748 (pages 2, 3 and 1)

The rotor laminated iron core described in Patent Document 1 is formed by joining and laminating core sheets by caulking, but the dowels formed on each core sheet for caulking are likely to be misaligned, resulting in laminating misalignment. In particular, there was a problem that the shape accuracy deteriorated.
In addition, when dowels are formed on the core sheet, the magnetic properties of the core sheet deteriorate, so the rotor laminated core described in Patent Document 1 also has a problem that the properties of the motor deteriorate.

  The rotor laminated core described in Patent Document 2 strictly manages the outer diameter of the rivet pin and the inner diameter of the through hole constituting the communication hole in order to laminate the core sheet with high accuracy, and sufficiently reduces the gap. In addition to the necessity, it is necessary to manage the straightness of the rivet pins, and there is a problem that the manufacturing yield is lowered and the cost of these members is increased.

The rotor laminated iron core described in Patent Document 3 uses a die-cast, and requires a work for removing the melt burr of the die-cast, and also requires dedicated equipment, resulting in an increase in manufacturing cost. It was.
In addition, due to heat and pressure when filling the molten metal in the die casting, the shape accuracy of the inner diameter of the rotor laminated core and the outer diameter of the cylindrical cover is deteriorated, and the magnetic characteristics of the permanent magnet are deteriorated by the molten metal. There was a problem that generation and loss (mainly iron loss) increased.
Furthermore, since integral molding is performed by die casting, there is a problem that a rotor that has been molded once cannot be easily disassembled.
Moreover, in the rotor laminated core described in Patent Document 3, the one using a clamp pin for fixing the laminated core has the same problem as the rotor laminated core described in Patent Document 2.

  The present invention has been made to solve the above-described problems, and its purpose is to reduce the shape accuracy and magnetic properties generated by caulking and fixing the core sheet by rivet pins, crank pins, and die casting. It is an object to provide a rotor laminated core and a method for producing the same, in which the deterioration of characteristics is small, the production cost is low, and the recyclability is excellent.

  A rotor laminated iron core according to the present invention is a rotor laminated iron core that is formed by laminating a plurality of core sheets, and that includes a rotation shaft through hole in which a rotation shaft is inserted and fixed at the center of the core sheet lamination surface. A thermoplastic resin material in which a plurality of core sheet positioning through-holes are provided between the through-holes for the rotating shaft of the laminated rotor core and the outer periphery, and are disposed surrounding the through-holes for positioning. The core sheet is fixed and fixed.

  In the method for manufacturing a rotor laminated core according to the present invention, when the rotor laminated core is made, at least a first hole serving as a through hole for a rotating shaft and a through hole for a rivet pin into which a rivet pin is inserted. A step of forming a core sheet having a plurality of third holes by punching, a step of inserting rivet pins into all the third holes in the core sheet formed by punching, and a core through which the rivet pins are inserted A step of disposing a thread-like thermoplastic resin on the surface of the sheet so as to surround the outer periphery of the rivet pin, a step of superimposing a new core sheet on the core sheet on which the thread-like thermoplastic resin is disposed, and a thread-like thermoplastic A step of repeating a step of arranging a resin and a step of stacking a new core sheet to form a core sheet laminate, a step of heating the core sheet laminate to melt the filamentous thermoplastic resin, The heated core sheet laminate is obtained and a step of fixing the core sheets with a resin material by cooling is formed by solidifying a thermoplastic resin in a molten filiform.

  A rotor laminated iron core according to the present invention is a rotor laminated iron core that is formed by laminating a plurality of core sheets, and that includes a rotation shaft through hole in which a rotation shaft is inserted and fixed at the center of the core sheet lamination surface. A thermoplastic resin material in which a plurality of core sheet positioning through-holes are provided between the through-holes for the rotating shaft of the laminated rotor core and the outer periphery, and are disposed surrounding the through-holes for positioning. Thus, the core sheet is fixed and fixed, the shape accuracy is good, the deterioration of magnetic characteristics is small, and the cogging torque, torque ripple and iron loss are less generated when used in a rotating electrical machine. Furthermore, since the resin material to which the core sheet is fixed can be remelted, the rotor laminated iron core can be easily disassembled into a core sheet shape and has excellent repairability.

  In the method for manufacturing a rotor laminated core according to the present invention, when the rotor laminated core is made, at least a first hole serving as a through hole for a rotating shaft and a through hole for a rivet pin into which a rivet pin is inserted. A step of forming a core sheet having a plurality of third holes by punching, a step of inserting rivet pins into all the third holes in the core sheet formed by punching, and a core through which the rivet pins are inserted A step of disposing a thread-like thermoplastic resin on the surface of the sheet so as to surround the outer periphery of the rivet pin, a step of superimposing a new core sheet on the core sheet on which the thread-like thermoplastic resin is disposed, and a thread-like thermoplastic A step of repeating a step of arranging a resin and a step of stacking a new core sheet to form a core sheet laminate, a step of heating the core sheet laminate to melt the filamentous thermoplastic resin, The core sheet is fixed with a resin material formed by solidifying the melted thread-like thermoplastic resin by cooling the heated core sheet laminate, and the manufacturing cost of the rotor laminated core In addition, when used in a rotating electrical machine, the occurrence of cogging torque, torque ripple, and iron loss is small, and a laminated rotor core excellent in repairability can be obtained.

Embodiment 1 FIG.
FIG. 1 is a perspective view (a) of a rotor laminated core according to Embodiment 1 of the present invention and a diagram (b) showing a state between core sheets constituting the rotor laminated core.
As shown in FIG. 1, the rotor laminated core 100 of the present embodiment includes a core sheet 2 that is laminated to form a rotor laminated core body, rivet pins 5 that fix the core sheet 2, A resin material 6 is provided between the core sheets and fixes the adjacent core sheets 2 to each other. The resin material 6 is disposed so as to surround all the rivet pins 5.
At the center of a plane perpendicular to the stacking direction of the core sheets 2 of the rotor laminated core 100 (referred to as the stacking direction of the rotor laminated core), a rotating shaft through hole 1 into which the rotating shaft is inserted and fixed is formed. .
Further, in the vicinity of the outer periphery of the surface perpendicular to the stacking direction of the rotor core 1, a plurality of permanent magnet through holes 3 having a rectangular shape and having permanent magnets inserted therein are arranged at regular intervals in the circumferential direction. It is arranged in a polygonal shape. In FIG. 1, the arrangement of the permanent magnet through holes 3 is a regular octagonal shape, but is not limited thereto, and may be a regular hexagonal shape, for example.

Further, inside the through holes 3 for permanent magnets arranged in a regular polygonal shape, a plurality of through holes (not shown) for inserting the rivet pins 5 and determining the position of the core sheet 2 are provided. The plurality of positioning through-holes are arranged so that when the adjacent through-holes are connected with a straight line, the straight line passes through the outer side of the rotary shaft through-hole 1. With such an arrangement, it is possible to prevent the amount of the resin material used for fixing the core sheet 2 from decreasing, and to prevent a decrease in the fixing force of the core sheet 2.
In the present embodiment, the plurality of positioning through holes in the core sheet 2 are rivet pin through holes into which the rivet pins 5 are inserted. The diameter of the through hole for the rivet pin is sufficiently larger than the outer diameter of the rivet pin 5, and the rivet pin 5 can be easily inserted into the core sheet 2, so that the core sheets 2 can be stacked easily.

  In the present embodiment, for the core sheet 2, for example, a magnetic plate material such as an iron plate or an electromagnetic steel plate having a thickness of about 1 mm or less is used. A thermoplastic resin material is used for the resin material 6 that fixes the adjacent core sheets 2 to each other. Examples of the thermoplastic resin material include nylon, vinyl chloride, polypropylene, polyester, and polyethylene. Further, the resin material 6 can withstand the temperature rise during the operation of the rotating electrical machine, and in order to shorten the heating and cooling time during the production of the rotor laminated core, the melting point of the thermoplastic resin material is What is about 70 to 200 degreeC is desirable. In particular, in this example, low melting point nylon 6 having a melting point of 125 ° C. to 145 ° C. was used.

Next, the manufacturing method of the rotor lamination | stacking iron core 100 of this Embodiment is demonstrated.
First, in the core sheet forming step, for example, a magnetic plate material such as an iron plate or an electromagnetic steel plate having a thickness of about 1 mm or less is punched into a circular and hollow shape by a progressive press machine or the like to form the core sheet 2. At this time, the core sheet 2 communicates when laminated, and the first hole 1a that becomes the through hole 1 for the rotating shaft of the rotor laminated core and the second hole 3a that becomes the through hole 3 for the permanent magnet. Each of the third holes 4a to be rivet pin through holes is formed.

Next, in the core sheet laminating step, the punched core sheet 2 is laminated while inserting the rivet pins 5 into all the third holes 4 a formed in the core sheet 2.
Further, in the step of laminating the core sheet 2, a region formed when the rivet pins 5 are connected to a plane perpendicular to the laminating direction of the core sheet 2 (denoted as the surface of the core sheet) There is a step of disposing the thread-like thermoplastic resin 6a so as to surround the outer periphery). In this embodiment, the thread-like thermoplastic resin 6a is a nylon 6 resin thread, and one having an equivalent diameter of 0.11 mm obtained by bundling 12 resin threads into one is used. Incidentally, its weight is about 110 g at 10,000 m.

In the step of disposing the thread-like thermoplastic resin 6a so as to surround the outer periphery of the rivet pin 5, for example, a winding machine 7 in which the thread-like thermoplastic resin 6a comes out from the tip of the nozzle 9 is used. Is used to rotate around the outer periphery of the rivet pin 5 or to rotate the main body of the core sheet 2 stacked through the rivet pin 5. After a predetermined amount of the thread-like thermoplastic resin 6a is disposed, the thread-like thermoplastic resin 6a coming out of the nozzle is cut using, for example, scissors.
In this manner, a new core sheet 2 is superimposed on the core sheet 2 on which the thread-like thermoplastic resin 6 a is disposed, and the thread-like thermoplastic resin is similarly formed on the surface of the new core sheet 2. 6a is disposed. By repeating such an operation, the thread-like thermoplastic resin 6 a is disposed between all the core sheets 2.

Next, in the core sheet fixing step, the laminated body of the core sheets 2 in which the thread-like thermoplastic resins 6a are disposed between all the core sheets 2 is heated, and the thread-like thermoplastic resins 6a between the core sheets 2 are melted. Then, the resin material 6 is spread thinly on the surface of the core sheet 2. The core sheets 2 laminated in this state are accurately pressed from the outer peripheral portion in the direction perpendicular to the lamination direction to the center direction using, for example, blocks, and the core sheets 2 are aligned. In a state where the core sheets 2 are aligned, the stacked core sheets 2 are cooled, the resin material 6 is solidified, and the adjacent core sheets 2 are fixed to each other.
Finally, in the rivet pin fixing step, for example, all the core sheets 2 are fixed by the rivet pins 5 by striking both ends of the rivet pins 5 protruding from the laminated core sheets 2 with a hammer or the like.
Such a process completes the rotor laminated core 100.
However, the caulking and fixing with the rivet pin is one method for more firmly fixing the laminated body of the core sheets fixed by the resin material 6, and is an additional method for fixing the core sheet 2 by the resin material 6. There is no need to do so.

FIG. 2 is a diagram for explaining in detail the process of disposing the thread-like thermoplastic resin in the manufacture of the rotor laminated core according to Embodiment 1 of the present invention.
(A) of FIG. 2 is a process of laminating core sheets. As shown in FIG. 2A, the core sheet 2 in which the first to third holes 1a, 3a, 4a are formed is laminated while inserting the rivet pin 5 into the third hole 4a. Go. At this time, the arm 8 of the winding machine 7 is disposed in the hole portion that forms the through-hole 1 for the rotating shaft of the rotor laminated core.
FIG. 2B is a process at the start of disposing the thread-like thermoplastic resin 6a. As shown in FIG. 2 (b), the nozzle 9 is provided on the arm 8 of the winding machine 7 arranged at the center of the core sheet laminate and extends in the direction of the outer periphery of the core sheet 2 laminate. The thread-like thermoplastic resin 6 a is discharged from the tip, and the discharged thread-like thermoplastic resin 6 a is entangled with one predetermined rivet pin 5.

FIG. 2C is a process in the middle of disposing the thread-like thermoplastic resin. As shown in FIG. 2 (c), the winding machine 7 rotates on the rotor rotating shaft, that is, the arm 8 rotates, and the thread-like thermoplastic resin 6a disposed so as to surround all the rivet pins 5. Is entangled again with the rivet pin 5 that is initially entangled, and then cut.
After a new core sheet 2 is laminated on the core sheet 2 on which the thread-shaped thermoplastic resin 6a is disposed, the thread-shaped thermoplastic resin 6a is disposed in the same manner. By repeating this operation, the thread-like thermoplastic resin 6 a is disposed between all the core sheets 2.
In these steps, by adjusting the thickness of the thread-like thermoplastic resin 6a and the number of times the thread-like thermoplastic resin 6a surrounds the rivet pin 5, the fixing force of the resin material 6 formed by melting or after melting The thickness of the can be adjusted freely. Therefore, the rotor laminated core 100 can secure a sufficient fixing force that does not break even when it is subjected to an external force applied during transportation or caulking of the rivet pin 5, and the product of the rotor laminated iron core 100 after completion can be secured. Thickness variation can be easily reduced.

FIG. 3 is a diagram for explaining in detail the fixing process of the core sheet with the resin material in the manufacture of the rotor laminated core according to the first embodiment of the present invention.
FIG. 3A is a perspective view of the core sheet laminate after the step of disposing the thread-like thermoplastic resin between the core sheets, and a schematic cross-sectional view showing the disposition state of the thread-like thermoplastic resin. It is.
As shown to (a) of FIG. 3, the core sheet laminated body has the thread-like thermoplastic resin 6a pinched | interposed between all the core sheets 2. As shown in FIG. However, the core sheets 2 are not aligned.
FIG. 3B is a perspective view of the core sheet laminate in the step of melting the thread-like thermoplastic resin between the core sheets, and a schematic cross-sectional view showing the state of the molten resin material.
As shown in FIG. 3B, the core sheet laminate is heated, for example, in a constant temperature furnace (not shown). The heating means may be induction heating, heat transfer, etc. other than using a thermostatic furnace. In the heated core sheet laminate, the thread-like thermoplastic resin 6 a between the core sheets 2 melts and spreads thinly between the core sheets 2 as the resin material 6. However, the core sheets 2 are not yet aligned.

FIG. 3C is a perspective view of the core sheet laminate in the process of pressing the heated core sheet laminate from the outer periphery to the center, and a schematic cross-sectional view showing the state of the pressurized core sheet. is there.
As shown in FIG. 3 (c), the core sheet laminated body in a state in which the resin material 6 is melted is used with a fan-shaped block 10 having a shape that matches the outer shape of the core sheet laminated body. The core sheets 2 are aligned by applying pressure in the center direction. Here, the outer peripheral part of the core sheet laminated body is pressurized from four directions.
FIG. 3D shows a perspective view of the core sheet laminate in the process of taking out and cooling the core sheet laminate in which the core sheets 2 are aligned from the thermostatic furnace, and the state of the core sheet fixed with the resin material. It is a cross-sectional schematic diagram shown.
As shown in FIG. 3D, the molten resin material 6 is solidified, and all the core sheets 2 in the core sheet laminate are aligned and fixed.
The core sheet laminate fixed with the resin material 6 is not essential, but is fixed with the rivet pins 5 to obtain the rotor laminated core 100 of the present embodiment.
In the schematic cross-sectional views shown in FIGS. 3A to 3D, the description of the permanent magnet through-hole 3 is omitted.

In the fixing process of the core sheet 2, since the fan-shaped block 10 having a shape that matches the outer shape of the core sheet laminate is used and the core sheet laminate is pressed from the four directions toward the center, all the core sheets 2 are Align so as to follow the surface shape of the block 10.
Therefore, the core sheet 2 can be accurately aligned by increasing the shape accuracy of the block 10. When the core sheet 2 is taken out of the thermostat and cooled in a state where the core sheets 2 are accurately aligned, the molten resin material 6 is solidified, and the adjacent core sheets 2 are fixed to each other while maintaining the alignment accuracy, and the shape accuracy is good. A rotor laminated core 100 can be obtained. Even when a part of the punched core sheet 2, for example, a thin portion is deformed, the shape of the core sheet 2 can be corrected by the pressure applied by the block 10. That is, the laminated core sheet 2 can be made to follow the shape of the block 10.

  Further, the core sheet laminate may be pressurized from the top in the stacking direction simultaneously with the alignment by pressurization from the outer periphery. If it carries out like this, while being able to reduce the clearance gap between the adjacent core sheets 2, the molten resin material 6 spreads thinner than the case where it does not pressurize from the upper part, and the adhering force between the core sheets 2 can be increased. And reducing the gap between the adjacent core sheets 2 reduces the thickness of the resin material with respect to the thickness of the rotor laminated core, and the space factor of the rotor laminated core (the ferromagnetic material with respect to the volume of the rotor laminated core). Ratio) can be improved, and a more efficient rotor laminated core can be obtained.

Alternatively, the core sheet laminate may be cooled and fixed with the resin material 6 in a state where the pressurization by the block 10 and the pressurization in the stacking direction of the core sheet laminate are released. If this is done, there may be a slight deterioration in shape accuracy, but this is in a practically acceptable range. If such a process is adopted, the productivity of the rotor laminated core is improved.
Further, not only the pressing and alignment are performed simultaneously, but also a procedure of aligning after pressing in the stacking direction of the core sheet 2 and a procedure of pressing in the stacking direction after aligning the core sheet 2 may be used. .
Further, when the rotating shaft is fixed by shrink fitting to the rotor laminated core 100, the rotor laminated core 100 is heated at the time of shrink fitting, so that the thread-like thermoplastic resin 6a can be melted simultaneously with the heating of the shrink fitting. Work time can be shortened.

In a rotor core with a conventional core structure in which core sheets are laminated and fixed using die casting, it is necessary to introduce a dedicated die casting device, and it is also necessary to remove burrs generated by molten die casting. Becomes expensive. And the rotor lamination | stacking iron core shape | molded by die-casting is integral molding, and if it shape | molds once, it cannot decompose | disassemble easily.
In addition, due to the heat and pressure at the time of filling the molten metal in the die casting, the shape accuracy of the inner diameter of the rotor laminated core deteriorates, the magnetic characteristics of the permanent magnet deteriorate due to the heat, and the cogging torque and torque ripple of the rotating electrical machine increase, and , An increase in loss (mainly iron loss) occurs.
In the conventional rotor laminated iron core with a core sheet laminated and fixed only with rivet pins, it is necessary to manage the fit between the outer diameter of the rivet pin and the through hole, which also reduces productivity and manufacture. Cost becomes expensive.
Further, in the case where the rotor laminated core is fixed by punching lamination (punching), lamination deviation of the rotor laminated core occurs due to residual stress during dowel forming or misalignment of the dowel. In addition, when fixing the rotor core with only rivet pins, if the straightness of the rivet pins to be fixed is not improved, the stacking accuracy will deteriorate, the cogging torque and torque ripple of the rotating electrical machine will increase, and loss (mainly Increase in iron loss).

However, in the rotor laminated iron core of the present embodiment, since the core sheet is laminated and fixed using a resin material, even if the fitting accuracy between the rivet pin and the core sheet is not strict, the shape accuracy is good and magnetic The deterioration of the characteristics is small, and when used in a rotating electrical machine, the occurrence of cogging torque, torque ripple, and loss (mainly iron loss) is small.
Moreover, since the resin material which fixes a core sheet is a thermoplastic resin material, since the resin material solidified once can be remelted, the rotor lamination | stacking iron core of this Embodiment can be core-sheet-shaped from a rotor lamination | stacking iron core. It is easy to disassemble and is easy to repair.
The rotor laminated core described in the present embodiment is a rotor laminated core of an IPM type rotating electrical machine, but is used as a rotor laminated core of an SPM type rotating electrical machine not provided with a permanent magnet through hole. And the same effect can be obtained.

Embodiment 2. FIG.
FIG. 4A is a diagram showing a state between core sheets constituting a rotor laminated core according to Embodiment 2 of the present invention, and FIG. 4B is a diagram showing a state where a rotating shaft is inserted into the completed rotor laminated core. ).
As shown in FIG. 4 (a), the rotor laminated core 200 of the present embodiment has a rivet pin through hole provided in the vicinity of the outer periphery of the rotary shaft through hole 1, and a resin for adhering the adjacent core sheet 2 to each other. The material 6 is also the same as the rotor laminated iron core 100 of the first embodiment except that the material 6 is disposed in the vicinity of the outer periphery of the through hole 1 for the rotating shaft.
In the rotor laminated core 200 of the present embodiment, the resin material 6 is disposed in the vicinity of the outer periphery of the rotating shaft through hole 1, but a part of the resin material 6 is disposed on the inner wall of the rotating shaft through hole 1. The portion 11 may be protruded and solidified to be disposed. With such a configuration, the completed rotor laminated core 200 is heated again, and the resin material 6 adhering to the inner wall portion 11 of the through hole 1 for the rotating shaft is remelted, and FIG. When the rotary shaft 12 is press-fitted as shown in FIG. 5, the rotary shaft 12 and the rotor laminated core 200 are firmly fixed by cooling and solidifying the resin material 6 as compared with the case of simply press-fitting, thereby obtaining a more reliable rotating electric machine. be able to.
Also in the present embodiment, when the rotary shaft 12 is fixed by shrink fitting, the resin material 6 can be melted simultaneously with the shrink fitting heating, so that the working time can be shortened.

Embodiment 3 FIG.
FIG. 5 is a diagram for explaining in detail the process of disposing the thread-like thermoplastic resin in the method for manufacturing a rotor laminated core according to the third embodiment of the present invention.
(A) of FIG. 5 is a process which arrange | positions the thread-like thermoplastic resin 6a in the core sheet 2 of the lowest layer. As shown in FIG. 5A, the thread-like thermoplastic resin 6a is discharged from the tip of the nozzle 9 of the arm 8 of the winding machine 7 disposed in the first hole 1a in the center of the core sheet 2. Then, after being entangled with a predetermined single rivet pin 5 inserted, a thread-like thermoplastic resin 6a is disposed so as to surround all the rivet pins 5 by the rotation of the arm 8, and is first entangled. The thread-like thermoplastic resin 6a is again hung on the rivet pin 5.

(B) and (c) in FIG. 5 are steps of disposing a thread-like thermoplastic resin 6a on the core sheet 2 in the middle portion of the second layer or more.
First, as shown in FIG. 5B, the thread-like thermoplastic resin 6 a disposed in the lowermost core sheet 2 is a key provided in the first hole 1 a in the center of the core sheet 2. It passes through the groove notch 1b and is drawn out to the upper surface side of the second core sheet 2. The notch 1b provided in the first hole 1a of the core sheet 2 is a portion into which a key material for preventing rotation between the rotating shaft and the rotor laminated core is inserted.
Next, as shown in FIG. 5 (c), the thread-like thermoplastic resin 6a drawn from the notch 1b to the upper surface side of the second-layer core sheet 2 is the first in the lowermost core sheet 2. After the thread-like thermoplastic resin 6a is hung on the rivet pin 5 entangled, the thread-like thermoplastic resin 6a is disposed so as to surround all the rivet pins 5 by the rotation of the arm 8, and is entangled first. The thread-like thermoplastic resin 6a is hung on the rivet pin 5 again. The steps (b) and (c) of FIG. 5 are repeated to dispose the thread-like thermoplastic resin 6a between the predetermined number of core sheets 2.

FIG. 5D shows a process of disposing the thread-like thermoplastic resin 6 a on the core sheet 2 that is one layer below the uppermost core sheet 2 and laminating the uppermost core sheet 2.
As shown in FIG. 5 (d), the thread-like thermoplastic resin 6a that passes through the notch 1b and is drawn to the surface is disposed so as to surround all the rivet pins 5, and is hung first. The rivet pin 5 is entangled again and then cut. Next, the core sheet 2 as the uppermost layer is laminated, and the process of disposing the thread-like thermoplastic resin is completed.
The arrangement process of these thread-like thermoplastic resins 6 a is also a lamination process of the core sheet 2, and the rivet pin 5 is inserted into the third hole 4 a of the core sheet 2.

In the present embodiment, since the thread-like thermoplastic resin 6a is disposed so as to surround the rivet pin 5 counterclockwise, the process of disposing the thread-like thermoplastic resin 6a on the lowermost core sheet 2 Thus, the rivet pin 5 that entangles the thread-like thermoplastic resin 6a first is closest to the notch 1b in the counterclockwise direction. If the thread-like thermoplastic resin 6a is disposed so as to surround the rivet pin 5 in the clockwise direction, the rivet pin 5 that ties the thread-like thermoplastic resin 6a first is notched in the clockwise direction. It is the closest one from 3b.
In the method for manufacturing a rotor laminated core according to the present embodiment, the core sheet forming step, the core sheet fixing step, and the rivet pin fixing step are the same as those of the rotor laminated core manufacturing method according to the first embodiment. is there.

According to the manufacturing method of the present embodiment, it is possible to continuously supply the thread-like thermoplastic resin 6a without cutting each core sheet, so that the working time is shortened and the rotor lamination is more efficiently performed. An iron core can be manufactured.
Further, in the core sheet 2 other than the core sheet 2 of the lowermost layer and the uppermost layer, it is not necessary to wind the thread-like thermoplastic resin 6a around the rivet pin 5 alone, and the nozzle 9 of the winding machine 7 is notched. Since the thread-like thermoplastic resin 6a is disposed by turning the outer peripheral side of the rivet pin 5 from 1b and returning to the notch portion 1b again, even when the punching speed when forming the core sheet 2 is high, And the thread-like thermoplastic resin 6a can be supplied correctly.

Embodiment 4 FIG.
FIG. 6 is a diagram for explaining in detail the process of disposing the thread-like thermoplastic resin in the method for manufacturing a rotor laminated core according to the fourth embodiment of the present invention.
FIG. 6A shows a process of binding a thread-like thermoplastic resin 6 a to a predetermined rivet pin 5 inserted through the core sheet 2. As shown in FIG. 6 (a), a thread-like thermoplastic resin is inserted into a predetermined rivet pin 5 inserted through the laminated core sheet 2 from the nozzle 9 of the winding machine 7 installed near the outer periphery of the core sheet laminated body. 6a is discharged and tied.
FIG. 6B shows a process of surrounding all the rivet pins 5 with a thread-like thermoplastic resin 6 a on the surface of the core sheet 2. As shown in FIG. 6 (b), the thread-like thermoplastic resin 6a surrounds all the rivet pins 5, re-entangles with the rivet pins 5 that are initially entangled, and then cuts.
FIG. 6C is a step of laminating a new core sheet 2 on the core sheet 2 on which the thread-like thermoplastic resin 6a is disposed. As shown in FIG. 6C, when the new core sheet 2 is laminated, the winding machine 7 is retracted to the outer peripheral side of the core sheet laminated body so that the nozzle 9 does not overlap the core sheet 2.

In the manufacturing method of the present embodiment, the means for the thread-like thermoplastic resin 6a to surround all the rivet pins 5 is a method of rotating the core sheet 2 itself. The rotation of the core sheet 2 itself can be realized, for example, by attaching a rotation mechanism to the table 16 on which the core sheets 2 are stacked.
And the core sheet 2 is laminated | stacked, arrange | positioning the thread-like thermoplastic resin 6a between the adjacent core sheets 2 by repeating the process of (a)-(c) of FIG.
Also in the method for manufacturing the rotor laminated core of the present embodiment, the core sheet forming step, the core sheet fixing step, and the rivet pin fixing step are the same as those in the method of manufacturing the rotor laminated core of the first embodiment. It is.
According to the manufacturing method of the present embodiment, even when the diameter of the rotary shaft through hole 1 is small and the winding machine 7 cannot be installed in this hole, the thread-like thermoplastic resin can be disposed between the core sheets.
In addition, since the punched core sheet is laminated while rotating at an equal angle, it is possible to eliminate the collapse of the rotor laminated iron core caused by the thickness deviation of the core sheet, and to form a rotor laminated iron core with good shape accuracy. Obtainable.

Embodiment 5 FIG.
FIG. 7 is a view for explaining a rotor laminated iron core according to Embodiment 5 of the present invention.
FIG. 7A is a perspective view showing a completed rotor laminated iron core and a cross-sectional model view showing a core sheet laminated and fixed. (B) of Drawing 7 is a perspective view and a section model figure showing a core sheet lamination process.
As shown in FIG. 7B, the rotor laminated core 300 according to the present embodiment is provided with a hole (denoted as a protrusion-attached hole) 15 having a protrusion 14 as a through hole for positioning the core sheet 2a. It is what was done.
As shown in FIG. 7A, the resin material 6 is disposed so as to surround all the protrusions 14 of the core sheet 2a, and all the adjacent core sheets 2a are fixed by the resin material 6. ing. The protrusions 14 of all the laminated core sheets 2a are inserted into the hole portions 13 of the protrusion-equipped holes 15 of the core sheet 2a that are overlaid thereon. However, the hole into which the protrusion 14 of the uppermost core sheet 2b is inserted has no protrusion. Further, the protrusion-provided hole 15 of the core sheet 2a is overlapped with the protrusion-provided hole 15 of the underlying core sheet 2a in a circumferential direction having a radius between the center of the core sheet 2a and the protrusion-provided hole 15. They are staggered.

Next, the manufacturing method of the rotor lamination | stacking iron core 300 of this Embodiment is demonstrated.
In the core sheet 2a, a plurality of round holes are formed before being punched and a part of the core sheet 2a is cut up from the end surface of the round hole, so that the protrusion 14 and the hole 13 are formed in each round hole. The protrusion-attached hole 15 is used.
The core sheet 2a is formed and laminated by using a punching laminated mold in which a driving mechanism that rotates around the center of the rotor laminated core is incorporated and a part that forms a round hole and a protrusion is provided. Is called. By using such a mold, the next core sheet 2a to be laminated is rotated and punched until the hole 13 comes to the position of the projection 14 of the core sheet 2a below it. That is, the core sheet 2a is punched out by rotating only the projection-provided holes 15 by a predetermined angle for each sheet.

In the method for manufacturing the rotor laminated core 300 according to the present embodiment, the step of disposing the thread-like thermoplastic resin 6a between the adjacent core sheets 2a includes the rivet pin that surrounds the thread-shaped thermoplastic resin 6a at the time of disposition. The first embodiment and the second embodiment are the same as the first embodiment except that the projection 14 is used instead of the fifth projection. Further, the fixing process of the core sheet 2a is the same as that of the first embodiment.
Since the rotor laminated core 300 according to the present embodiment does not use rivet pins, the number of parts can be reduced and the cost can be reduced. Moreover, since it fixes only with the resin material 6, it is not necessary to strike the both ends of a rivet pin with a hammer etc., the assembly process of a rotor lamination | stacking iron core can be decreased, and productivity improves.

FIG. 8 is a view for explaining a rotor laminated core using a core sheet in which the height of the protrusion according to the fifth embodiment of the present invention is larger than the plate thickness.
The rotor laminated iron core shown in FIG. 8 increases the size of the hole 13 of the protrusion-equipped hole 15, and the two core sheets below the hole 13 of the protrusion-formed hole 15 of one core sheet 2a. The protrusion 14 of 2a enters. For this reason, there are two identical core sheets 2a, and for each two stacked sheets, only the protrusion-provided holes 15 are rotated by an arbitrary angle. Although not shown, the protrusion 14 is inserted into the rectangular hole opened by cutting and raising the protrusion 14 by twisting the protrusion 14 by 90 ° without increasing the size of the hole portion 13 of the hole 15 with protrusion. I can escape. At this time, it is necessary to make the width of the protrusion 14 thicker than the thickness of the core sheet 2a.
With such a structure, it becomes easy to dispose the thread-like thermoplastic resin 6a.

  In the rotor laminated core according to the present invention, the core sheet is fixedly joined with a thermoplastic resin material, and all the core sheets are aligned and the lamination accuracy is excellent, so that cogging torque and torque ripple are obtained. It can be applied to a rotating electrical machine with a small occurrence of iron loss.

It is the perspective view (a) of the rotor lamination | stacking iron core concerning Embodiment 1 of this invention, and the figure (b) which shows the state between the core sheets which comprise a rotor lamination | stacking iron core. It is a figure explaining the arrangement | positioning process of the thread-like thermoplastic resin in manufacture of the rotor lamination | stacking iron core concerning Embodiment 1 of this invention in detail. It is a figure explaining the adhering process of the core sheet by the resin material in manufacture of the rotor lamination | stacking iron core concerning Embodiment 1 of this invention in detail. It is the figure (a) which shows the state between the core sheets which comprise the rotor laminated iron core concerning Embodiment 2 of this invention, and the figure (b) which shows the state which inserted the rotating shaft in the completed rotor laminated iron core. . It is a figure explaining the arrangement | positioning process of the thread-like thermoplastic resin in the manufacturing method of the rotor lamination | stacking iron core concerning Embodiment 3 of this invention in detail. It is a figure explaining the arrangement | positioning process of the thread-like thermoplastic resin in the manufacturing method of the rotor lamination | stacking iron core concerning Embodiment 4 of this invention in detail. It is a figure explaining the rotor lamination | stacking iron core concerning Embodiment 5 of this invention. It is a figure explaining the rotor lamination | stacking iron core using the core sheet | seat whose projection height which concerns on Embodiment 5 of this invention is larger than board thickness.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Through-hole for rotating shafts, 1a 1st hole, 1b Notch part, 2, 2a Core sheet,
3 Permanent magnet through hole, 3a 2nd hole, 4a 3rd hole, 5 rivet pin,
6 resin material, 6a thread-like thermoplastic resin, 7 winding machine, 8 arm, 9 nozzle,
10 fan-shaped block, 11 inner wall part, 12 rotating shaft, 13 hole part, 14 protrusion,
15 hole with projection, 16 table, 100, 200, 300 Rotor laminated iron core.

Claims (12)

  A rotor laminated iron core that is formed by laminating a plurality of core sheets and has a through-hole for a rotating shaft in which a rotating shaft is inserted and fixed at the center of the core sheet laminated surface. A plurality of through holes for positioning of the core sheet are provided between the through hole for rotating shaft and the outer periphery, and the core sheet is a thermoplastic resin material disposed so as to surround the through hole for positioning. Rotor laminated iron core fixed and fixed.   A plurality of core sheet positioning through-holes are arranged so that when the adjacent through-holes for positioning are connected by a straight line, the straight line passes through the outside of the rotary shaft through-hole. The rotor laminated core according to claim 1.   The rotor laminated core according to claim 1, wherein the positioning through hole is provided in the vicinity of the outer periphery of the rotary shaft through hole.   4. The rotor according to claim 1, wherein a rivet pin is inserted into the positioning through hole to position the core sheet, and the rivet pin is also fixed. 5. Laminated iron core.   The positioning through-hole is a hole with a protrusion, and the protrusion of the hole with the protrusion of the adjacent lower core sheet is inserted into the hole of the hole with the protrusion of the core sheet. The rotor lamination | stacking iron core of any one of Claim 3.   The core hole is formed by rotating and shifting the protrusion-provided hole of the adjacent lower core sheet in a circumferential direction having a radius between the center of the core sheet and the protrusion-provided hole. The rotor laminated iron core according to claim 5, wherein sheets are laminated.   The rotor laminated core according to any one of claims 1 to 6, wherein the thermoplastic resin material is nylon or polyester.   The plurality of permanent magnet through holes into which the permanent magnets are inserted in the vicinity of the inside of the outer peripheral portion are arranged in a regular polygonal shape at intervals in the circumferential direction. The rotor laminated core described in 1.   When a rotor laminated iron core is formed, a core sheet provided with at least a first hole serving as a rotating shaft through hole and a plurality of third holes serving as rivet pin through holes into which rivet pins are inserted is punched. A step of forming, a step of inserting the rivet pin into all the third holes in the core sheet formed by the punching, and an outer periphery of the rivet pin is surrounded by a surface of the core sheet through which the rivet pin is inserted. A step of disposing the thread-like thermoplastic resin, a step of superimposing the core sheet on the core sheet on which the thread-like thermoplastic resin is disposed, and a step of disposing the thread-like thermoplastic resin. Repeating the steps of stacking the new core sheet to form a core sheet laminate, heating the core sheet laminate to melt the thread-like thermoplastic resin, and It heated The method of manufacturing a laminated rotor core and a step of fixing the core sheet by cooling the core sheet laminate with a resin material formed by solidifying a thermoplastic resin filamentous which is above the melting.   In the step of stacking a new core sheet on the core sheet on which the thread-shaped thermoplastic resin is disposed, the thread-shaped thermoplastic resin is newly stacked on the core sheet on which the thread-shaped thermoplastic resin is disposed on the lower layer. 10. The method for manufacturing a rotor laminated core according to claim 9, wherein the core sheet is pulled out to the surface of the new core sheet through a notch provided in the through hole for the rotating shaft of the core sheet to be formed.   A step of heating the core sheet laminate to melt the filamentary thermoplastic resin, and a core made of a resin material formed by cooling the heated core sheet laminate and solidifying the melted filamentous thermoplastic resin In the step of fixing the sheet, at least one of pressurization from the outer periphery of the core sheet laminate to the center and pressurization from the upper part in the stacking direction of the core sheet laminate is applied to the core sheet laminate. The method for manufacturing a rotor laminated core according to claim 9 or 10, wherein any one of pressurizations is performed.   The rotor laminated core according to claim 9 or 10, wherein melting of the thread-like thermoplastic resin in the core sheet laminate is simultaneously performed with shrink fitting of the rotating shaft inserted into the through hole for the rotating shaft. Manufacturing method.

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