How to design a jig plate

Abstract

To provide a design method of a jig plate capable of reducing the types of jig plates for multiple types of core bodies.SOLUTION: A jig plate 20 includes a plate body 21 having an upper surface 21c on which a core body 11 having a central hole 11a and a plurality of magnet housing holes 13 is mounted, and a pin 26 protruding from the upper surface 21c and in contact with the lower surface of the magnet 14 housed in the magnet housing hole 13. The jig plate 20 is applicable to a first core body 11 and a second core body having the same number of magnet housing holes as each other and different in positions of the magnet housing holes from each other. The magnet housing holes of core bodies different in type from each other have regions A that overlap in the axial direction on the jig plate 20. The pin 26 is set in the region A.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] The present invention relates to a method for designing a jig plate that is applied to a manufacturing device for a rotor core of an interior permanent magnet motor. [Background technology]

[0002] The rotor core of an embedded magnet motor is constructed by stacking multiple iron core pieces and includes a core body having a central hole and multiple magnet accommodating holes, and magnets inserted into each magnet accommodating hole and fixed to the core body via a thermosetting resin material.

[0003] In the manufacture of such rotor cores, there is known an apparatus that fills magnet accommodating holes with a thermosetting resin material and thermally hardens the resin material to fix the magnets to the core body (see, for example, Patent Document 1).

[0004] The device includes a spacer on which the core body is placed. A regulating pin is attached to the spacer at a position corresponding to the magnet accommodating hole. The regulating pin protrudes from the upper surface of the spacer. The regulating pin raises the lower surface of the magnet above the upper surface of the spacer, thereby fixing the magnet to the core body with the magnet positioned at the center of the core body in the axial direction. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Patent Application Publication No. 2019-140842 Summary of the Invention [Problem to be solved by the invention]

[0006] The shape of the magnet housing holes varies depending on the type of rotor core. Therefore, spacers (hereinafter referred to as jig plates) with different arrangements of regulating pins are required depending on the type of rotor core. As a result, the number of types of jig plates increases as the number of types of rotor cores increases, which creates a problem of complicated management of the jig plates.

[0007] An object of the present invention is to provide a method for designing a jig plate that can reduce the number of types of jig plates. [Means for solving the problem]

[0008] A method for designing a jig plate to solve the above problem is applied to a manufacturing device for rotor cores of embedded magnet motors, and is a method for designing a jig plate comprising a plate body having a mounting surface on which a core body having a central hole and multiple magnet accommodating holes is placed, and pins that protrude from the mounting surface and abut the undersides of the magnets accommodated in the magnet accommodating holes, wherein the jig plate is applicable to multiple types of core bodies that have the same number of magnet accommodating holes but differ from each other in at least one of the shape and position of the magnet accommodating holes, and the magnet accommodating holes of the different types of core bodies have overlapping areas in the axial direction of the core body, and the pins are set within the area.

[0009] According to this method, for example, if the first core body and the second core body have the same number of magnet accommodating holes but at least one of the shape and position of the magnet accommodating holes is different, the magnet accommodated in the magnet accommodating hole of either core body will abut against the upper surface of the corresponding pin. This allows a common jig plate to be used for multiple different types of core bodies. Therefore, the number of types of jig plates can be reduced. [Brief explanation of the drawings]

[0010] [Figure 1]FIG. 1 is a perspective view showing a rotor core manufactured using a jig plate according to one embodiment of a method for designing a jig plate. [Figure 2] FIG. 2 is a vertical cross-sectional view showing the rotor core of the embodiment. [Figure 3] FIG. 3 is a vertical cross-sectional view showing the rotor core manufacturing apparatus of the embodiment together with the rotor core. [Figure 4] FIG. 4 is a plan view showing the core body placed on the jig plate of the same embodiment. [Figure 5] FIG. 5 is an enlarged plan view showing a part of FIG. [Figure 6] FIG. 6 is a view corresponding to FIG. 5 and is an enlarged plan view showing the core body placed on the jig plate of the first modified example. [Figure 7] FIG. 7 is a view corresponding to FIG. 5 and is an enlarged plan view showing the core body placed on the jig plate of the second modified example. [Figure 8] FIG. 8 is a view corresponding to FIG. 3 and is a vertical cross-sectional view showing a rotor core manufacturing apparatus equipped with a jig plate of the third modified example, together with the rotor core. DETAILED DESCRIPTION OF THE INVENTION

[0011] Hereinafter, one embodiment of a method for designing a jig plate will be described with reference to FIGS. First, with reference to FIGS. 1 and 2, a rotor core of an interior magnet motor manufactured using the jig plate of this embodiment will be described.

[0012] 1 and 2, the rotor core 10 includes a core body 11 formed of a laminate of a plurality of core pieces 12 made of electromagnetic steel sheets. The core body 11 is substantially cylindrical and has an axis C.

[0013] In the following description, the radial direction of the core body 11 will be simply referred to as the radial direction, and the circumferential direction of the core body 11 will be simply referred to as the circumferential direction. The core body 11 has a central hole 11a and a plurality of magnet accommodating holes 13 located on the outer circumferential side of the central hole 11a and spaced apart from one another in the circumferential direction. The central hole 11a and each of the magnet accommodating holes 13 penetrate the core body 11 along its axial direction (the vertical direction in FIGS. 1 and 2).

[0014] The magnet accommodating hole 13 of this embodiment has a generally rectangular shape in a plan view, and is inclined relative to the circumferential direction. As shown in FIG. 1, a pair of keys 11b are provided on the inner peripheral surface of the central hole 11a so as to project therefrom and face each other in the radial direction of the core body 11. As shown in FIG.

[0015] As shown in FIG. 2, a rectangular parallelepiped magnet 14 extending along the axis C of the core body 11 is inserted into each magnet accommodating hole 13. As shown by the two-dot chain line in Fig. 5, two magnets 14 are arranged adjacent to each other in the direction of the long side of magnet accommodating hole 13. The interior of each magnet accommodating hole 13 is filled with a resin material 15 for fixing magnet 14. Note that resin material 15 is preferably a thermosetting resin such as epoxy resin.

[0016] The core body 11 of this embodiment is composed of multiple blocks in which multiple iron core pieces 12 are stacked. The iron core pieces 12 constituting each block have a well-known joint portion (not shown) formed by dowel processing to protrude toward one side of the stacking direction (axial direction). Adjacent iron core pieces 12 are joined to each other by crimping their joint portions due to the concave-convex relationship. One end of each block includes a dummy iron core piece 12 having a hole (not shown) where the joint portion is punched out. Therefore, the dummy iron core piece 12 is joined to the iron core pieces 12 of a pair of adjacent iron core pieces 12 that constitute the same block as the dummy iron core piece 12, but is not joined to the iron core pieces 12 that constitute a block other than the dummy iron core piece 12. Therefore, the blocks constituting the core body 11 are separated from each other when no resin material 15 is provided inside each magnet accommodating hole 13.

[0017] Next, a manufacturing device for the rotor core 10 will be described. As shown in FIG. 3, the manufacturing apparatus includes a jig plate 20 and a cull plate 40 .

[0018] <Jig plate 20> As shown in FIG. 3, the jig plate 20 includes a plate body 21, a pin 26, and a post portion 30.

[0019] The plate body 21 includes a lower plate 22 and an upper plate 23 disposed on the upper surface of the lower plate 22 . The post portion 30 is cylindrical and protrudes from the center of the lower plate 22. The post portion 30 is inserted into the center hole 11a of the core body 11.

[0020] A pair of key grooves 31 into which the respective key portions 11b of the core body 11 are inserted are provided along the axial direction on the outer peripheral surface of the post portion 30 (see FIG. 4). By inserting the key portions 11b of the core body 11 into the key grooves 31 of the post portion 30, the phase of the core body 11 relative to the lower plate 22, more specifically, the phase of each block constituting the core body 11, is determined.

[0021] The upper plate 23 is provided with a through-hole 24 having a generally circular shape in plan view and centered on the axis C. A pair of restricting protrusions (not shown) are provided on the inner peripheral surface of the through hole 24. The restricting protrusions are inserted into the pair of key grooves 31 of the post portion 30 to position the upper plate 23 relative to the lower plate 22. When the post portion 30 is inserted into the through hole 24 of the upper plate 23, the lower surface 11c of the core body 11 abuts against the upper surface 21c of the upper plate 23.

[0022] 3 and 4, a plurality of insertion holes 25 are provided in the upper plate 23 at positions that overlap with the magnet accommodating holes 13 in the axial direction. Two insertion holes 25 are provided for each magnet accommodating hole 13. Two pins 26 are inserted into the two insertion holes 25 from below and fixed thereto.

[0023] The pin 26 has a protruding portion 26 a that protrudes above the upper surface 21 c of the upper plate 23 . The jig plate 20 of this embodiment is applicable to two types of core bodies 11, 111 that have the same number of magnet accommodating holes 13, 113 but different positions of the magnet accommodating holes 13, 113.

[0024] In this embodiment, the magnet accommodating holes 13 and 113 have the same shape. As shown in FIG. 4, the magnet accommodating holes 113 are disposed radially outward of the magnet accommodating holes 13.

[0025] As shown in FIGS. 4 and 5, the magnet accommodating holes 13, 113 of the core bodies 11, 111 of different types have an overlapping region A in the axial direction of the core bodies 11, 111.

[0026] The region A has an elongated shape in plan view. The direction perpendicular to both the longitudinal direction and the axial direction of the region A in plan view is defined as the width direction. The two pins 26, more specifically the two protrusions 26a, are set within the region A.

[0027] The two pins 26 are disposed at the center of the region A in the width direction. <Calplate 40> 3, a cull plate 40 is placed on the upper surface 11d of the core body 11. The lower surface 40a of the cull plate 40 abuts against the upper surface 11d of the core body 11.

[0028] The cull plate 40 is provided with a plurality of filling pots 41 spaced apart from one another in the circumferential direction for filling the resin material 15 into each magnet accommodating hole 13 of the core body 11. Each filling pot 41 penetrates the cull plate 40 in the thickness direction and communicates with the pair of magnet accommodating holes 13.

[0029] In this embodiment, the upper surface 21c of the upper plate 23 corresponds to the mounting surface of the present invention. The key portion 11b of the core body 11 corresponds to the engaging portion of the present invention. The key groove portion 31 of the post portion 30 corresponds to the engaged portion of the present invention.

[0030] Next, a procedure for fixing the magnet 14 to the core body 11 using a manufacturing device to which the jig plate 20 of this embodiment is applied will be described. First, the core body 11 is placed on the upper surface 21c of the upper plate 23 of the jig plate 20, and then the magnets 14 are inserted into the magnet accommodating holes 13 of the core body 11. At this time, the key portions 11b are inserted into the key groove portions 31. Within each magnet accommodating hole 13, the lower surface of each magnet 14 comes into contact with the protruding portions 26a of each pin 26 above the lower surface 11c of the core body 11. This restricts downward displacement of the magnets 14, and positions the magnets 14 in the axial direction.

[0031] Next, as shown in FIG. 3, the cull plate 40 is placed on the upper surface 11d of the core body 11. Next, the resin material 15 is supplied to the filling pot 41. The resin material 15 is filled into the magnet accommodating hole 13 of the core body 11 through the filling pot 41. Note that the resin material 15 is not shown in the drawing.

[0032] Next, the entire manufacturing apparatus is heated by a heating device to thermally harden the thermosetting resin material 15, thereby fixing the magnet 14 to the core body 11. Next, the operation of this embodiment will be described.

[0033] 5, whichever magnet 14 is accommodated in the magnet accommodating hole 13, 113 of either core body 11, 111 abuts against the upper surface of the pin 26 corresponding to that magnet 14. This allows a common jig plate 20 to be used for different types of core bodies 11, 111.

[0034] Next, the effects of this embodiment will be described. (1) The pin 26 is set in the region A where the magnet accommodating holes 13, 113 of the core bodies 11, 111 of different types overlap each other in the axial direction.

[0035] According to this method, the above-mentioned effects are achieved, and therefore the number of types of jig plates 20 can be reduced. (2) The pin 26 is disposed at the center of the width of the region A.

[0036] If the pin 26 is positioned closer to the magnet accommodating hole 13 of the first rotor body 11 in the width direction of the region A, the pin 26 will approach the center position of the end face of the magnet 14 accommodated in the magnet accommodating hole 13. On the other hand, the pin 26 will be farther away from the center of the magnet 14 accommodated in the magnet accommodating hole 113 of the second rotor body 111. As a result, there is a risk that the magnet 14 accommodated in the magnet accommodating hole 113 of the second rotor body 111 will not be stably supported.

[0037] In this regard, the above method can prevent the magnet 14 from becoming unable to be stably supported. (3) The jig plate 20 has a post portion 30 that protrudes from the plate body 21 and is inserted into the central hole 11a. The outer peripheral surface of the post portion 30 is provided with a key groove portion 31 into which a key portion 11b provided on the inner peripheral surface of the central hole 11a is inserted.

[0038] According to this method, the key portion 11b provided in the central hole 11a of the core body 11 engages with the key groove portion 31 provided on the outer peripheral surface of the post portion 30, thereby positioning the core body 11 in the circumferential direction of the post portion 30. Therefore, the positioning of the core body 11 relative to the jig plate 20 can be easily performed.

[0039] <Modification> This embodiment can be modified as follows: This embodiment and the following modifications can be combined and implemented within the scope of technical compatibility.

[0040] The jig plate 20 may not have the post portion 30. In this case, a post portion may be provided on a fixed mold located below the jig plate 20, and a through hole may be provided in the plate body so that the post portion passes through.

[0041] Although the protrusion 26a of the pin 26 is arranged at the center of the width of the region A, the arrangement of the protrusion 26a may be changed as appropriate within the region A. Even in this case, it is sufficient that the magnet 14 can be positioned at a predetermined position within the magnet accommodating hole 13 by supporting the magnet 14 from below.

[0042] The number of magnets 14 accommodated in the magnet accommodating hole 13 is not limited to two, but may be one or three. For example, as shown in Figure 6, if three magnets 14 are accommodated in the magnet accommodating hole 13, three pins 26 may be set in the above-mentioned area A to respectively correspond to the three magnets 14.

[0043] For example, as shown in FIG. 7, when two magnets 14 are housed in the magnet housing hole 13, one pin 26 can be set between the magnets 14. In the present embodiment, the jig plate 20 is exemplified as being applicable to multiple types of core bodies 11, 111 having the same number of magnet accommodating holes 13, 113 but different positions of the magnet accommodating holes 13, 113. Alternatively, the present invention can be embodied as a jig plate that is applicable to multiple types of core bodies having the same number of magnet accommodating holes but different shapes of the magnet accommodating holes. Furthermore, the present invention can be embodied as a jig plate that is applicable to multiple types of core bodies having the same number of magnet accommodating holes but different shapes and positions of the magnet accommodating holes.

[0044] In this embodiment, the plate body 21 is made up of the lower plate 22 and the upper plate 23, but the lower plate 22 may be omitted and the post portion 30 may be fixed to the upper plate 23.

[0045] In this embodiment, the plate body 21 and the pin 26 are configured as separate bodies, but this is not limited to this. As shown in Fig. 8, the pin 26 may be configured by protruding a part of the upper surface of the plate body 21. [Explanation of symbols]

[0046] 10...Rotor core 11,111...Core body 11a...Center hole 11b...Key portion (engagement portion) 11c…Bottom surface 11d…Top surface 12...Iron core piece 13,113...Magnet housing hole 14...Magnet 15...Resin material 20...Jig plate 21...Plate body 21c...Top surface (mounting surface) 22...Lower plate 23...Upper plate 24...Through hole 25...Through hole 26...pin 26a...Protruding part 30...Post Office 31...Key groove portion (engaged portion) 40...Calplate 40a…Bottom surface 41...Filling pot

Claims

1. A method for designing a jig plate applicable to a manufacturing device for a rotor core of an embedded magnet motor, the method comprising: a plate body having a mounting surface on which a core body having a center hole and a plurality of magnet accommodating holes is placed; and pins protruding from the mounting surface and abutting against the undersides of magnets accommodated in the magnet accommodating holes, the jig plate is applicable to a plurality of types of core bodies each having the same number of magnet accommodating holes and different shapes and / or positions of the magnet accommodating holes, When the axial direction of the core body is defined as the axial direction and the direction perpendicular to the axial direction is defined as the orthogonal direction, the plurality of types of core bodies include a first core body having a first magnet accommodating hole and a second core body having a second magnet accommodating hole, the first magnet accommodating hole and the second magnet accommodating hole have an overlapping region in the axial direction, the region is biased from the center of the first magnet accommodating hole to one side in the orthogonal direction, and is biased from the center of the second magnet accommodating hole to the opposite side to the one side, setting the pin within the region; How to design a fixture plate.

2. The region is elongated in plan view, When the direction perpendicular to both the longitudinal direction and the axial direction of the region in a plan view is defined as the width direction, The pin is disposed at the center of the width of the region. The method for designing a jig plate according to claim 1 .

3. the jig plate has a post portion that protrudes from the plate body and is inserted into the central hole, an engaged portion is provided on an outer peripheral surface of the post portion, into which an engaging portion provided on an inner peripheral surface of the center hole is inserted; The method for designing a jig plate according to claim 1 or 2.

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