JP2012110164A - Rotor core for rotary electric machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a rotor core for a rotary electric machine having high rotation strength.SOLUTION: Core plate pieces 3 have multiple caulking parts 10-10which include salient parts 11-11protruding from faces at one side and recessed parts 12-12for coupling with the salient parts of the caulking parts of other layers. Couplings of salient parts and recessed parts are tight fit in radial direction and loose fit with gaps d-din circumferential direction. The caulking parts 10-10are composed of first caulking parts 10and 10which are adjacent to positions of joints Dof the core plates overlapping in the lamination direction, second caulking parts 10and 10which are arranged at ends of the core plates, and third caulking parts 10, 10, 10and 10which are formed between the first and the second caulking parts. The gaps dbetween the recessed parts of the second caulking parts and the salient parts of the first caulking parts of other layers are set to be the largest among the gaps d-d.

Description

  The present invention relates to a rotor core of a rotating electrical machine formed by laminating a plurality of core plates, and more particularly to a caulking structure thereof.

  In general, a rotor core of a rotating electrical machine is known that is formed by laminating core plates made by punching electromagnetic steel sheets in order to reduce the generation of eddy currents. Conventionally, in a rotor core (rotor core 8) in which a plurality of such core plates (iron core blanks 9) are stacked, a plurality of circular caulking portions 16 are formed on the core plate 9 by punches, and the stacked core plates are Has been devised by caulking the dowel (see, for example, Patent Document 1).

  By the way, in order to form a rotor core by laminating core plates as in Patent Document 1, a plurality of core plates are required. If the shape of the core plate is an annular shape, the core plate is removed from the base material. When punching, the center of the ring cannot be used, resulting in a low yield. For this reason, the core plate is formed by connecting a plurality of arc-shaped core plate pieces, and the core plates are laminated so that the phase (circumferential position) of the seams of the core plate pieces is shifted (so-called brick stacking). ) A rotor core may be formed (see Patent Document 2).

  Then, the core plate pieces are bricked in this way to form the rotor core, and when the core plates are caulked together by dowel caulking, a rotor core having a high yield and capable of holding the shape alone can be formed. .

JP 2010-142114 A Japanese Patent Laid-Open No. 2002-262496

  However, when the core plate is formed by connecting the core plate pieces, strong stress is generated in the circumferential direction of the core plate with respect to the caulking portion based on the centrifugal force when the rotor core rotates.

  Further, the caulking portion of the circular shape causes tensile residual stress over the entire circumference, and the portion of the caulking portion where the stress is generated based on the centrifugal force causes the residual stress of the tensile force. Both stress and stress based on centrifugal force work.

  Therefore, in order to keep the rotational strength of the rotor core at a required strength, it is necessary to improve the strength of the caulking portion as compared with the case where the rotor core is formed without dividing the core plate. In order to improve the strength of the caulking portion, it is conceivable to increase the area where the stress based on the centrifugal force and the residual stress work and to receive these stresses in a distributed manner. However, when the diameter of the circular caulking portion is increased. There is a problem in that it is necessary to increase the radial width of the rotor core, the rotor core may be increased in diameter, and the yield is also deteriorated.

  On the other hand, when the rotor core is made thick to increase the area where the stress and residual stress based on the centrifugal force are applied, the eddy current generated in the rotor core is increased, and the efficiency of the rotating electrical machine is reduced.

  Furthermore, the stress generated based on the centrifugal force varies among the caulking portions formed in the circumferential direction of the core plate, depending on the circumferential position, and the specific caulking portion. There has been a problem that a large stress is generated.

  Therefore, in the present invention, the caulking part is formed so that the part receiving the stress based on the centrifugal force and the part where the residual stress is generated are separated, and by making the stress acting on each caulking part as uniform as possible, It aims at providing the rotor core which solved the above-mentioned subject.

The present invention is formed by laminating a plurality of annular core plates (2), and arc-shaped core plate pieces (3) obtained by equally dividing the core plate (2) are connected to form the core plate ( 2), and the positions of the circumferential direction (C) of the seams (D ₁ , D ₂ ) of the core plate pieces (3) of the core plate are alternately different for each layer. In the rotor core (1) of the rotating electrical machine
The core plate piece (3) is formed at the same position as the convex portion (11) on the surface on one side in the stacking direction and the convex portion (11) on the other side in the stacking direction. A caulking portion (10) having a concave portion (12) fitted to the convex portion (11) of the core plate piece (3) of the other layer that is in contact with the surface on the other side in the laminating direction when the A plurality of core plates (2) are provided in the circumferential direction,
The plurality of caulking portions (10 ₁ to 10 ₈ ), the first caulking portion (10 ₄ , 10 ₅ ) adjacent to the joint position (D ₂ ) of the core plate piece (3) of the other layer, and the core plate A second caulking portion (10 ₁ , 10 ₈ ) provided at an end of the piece (3) and a third caulking portion (10 ₂ , 10 ₃ , 10) formed between the first and second caulking portions. ₆ , 10 ₇ ), and the concave portions (12 ₄ , 12 ₅ ) of the first caulking portions (10 ₄ , 10 ₅ ) are the second caulking portions of the core plate piece (3) of the other layer. protrusion parts ₍₁₀ 1, 10 ₈₎ fitted in ₍₁₁ 1, 11 _8), the second crimping portion recesses ₍₁₀ 1, 10 _{8) (12} 1, 12 _8), the other layer Convex part (11 ₄ , 1) of the first caulking part (10 ₄ , 10 ₅ ) of the core plate piece (3) 1 ₅₎ fitted, the third crimping portions _{(10 2,} 10 _3, 10 6, recesses 10 _{7) (12 2,} 12 _3, 12 6, 12 _7), said core plate of said other layer The core plate (2) so as to be fitted to the convex portions (11 ₂ , 11 ₃ , 11 ₆ , 11 ₇ ) of the third caulking portion (10 ₂ , 10 ₃ , 10 ₆ , 10 ₇ ) of the piece (3) )
The fitting of the convex portions (11 _{1 to} 11 ₈ ) and the concave portions (12 _{1 to} 12 ₈ ) of the _first to third caulking portions (10 ₁ to 10 ₈ ) is determined in the radial direction of the core plate (2) ( R) is an interference fit, and a gap fit with a predetermined gap (d ₂ ) is provided in the circumferential direction (C) of the core plate (2) and the second caulking portion (10 ₁ , 10 ₈ ). Circumferential direction between the concave portions (12 ₁ , 12 ₈ ) and the convex portions (11 ₄ , 11 ₅ ) of the first caulked portions (10 ₄ , 10 ₅ ) of the core plate piece (3) of the other layer ( the clearance of C) a _{(d 21),} said third crimping portions _{(10 2,} 10 _3, 10 6, recesses 10 _{7) (12 2,} 12 _3, 12 6, 12 ₇₎ with the other layer core said third crimping portions of the plate piece (3) _{(10 2,} 10 _3, 10 6, 10 ₇ Protrusions of larger than the gap in the circumferential direction (C) between the _{(11 2, 11 3, 11} 6, 11 7) (d 23, d 24),
It is characterized by that.

Further, the concave portion (12 ₄ , 12 ₅ ) of the first caulking portion (10 ₄ , 10 ₅ ) and the convex portion of the second caulking portion (10 ₁ , 10 ₈ ) of the core plate piece (3) of the other layer. The size of the gap (d ₂₂ ) in the circumferential direction (C) between (11 ₁ , 11 ₈ ) and the recess (12 ₁ , 12 ₈ ) of the second caulking portion (10 ₁ , 10 ₈ ) The clearance (d ₂₁ ) in the circumferential direction (C) between the convex portion (11 ₄ , 11 ₅ ) of the first caulking portion (10 ₄ , 10 ₅ ) of the core plate piece (3) of the other layer. or less and, said third crimping portions recesses _{(10 2,} 10 _3, 10 6, 10 _{7) (12 2,} 12 _3, 12 6, 12 ₇₎ and the core plate piece of the other layer (3) Convex parts (11 ₂ , 11 ₃ , 11 ₆ , 11 ₇ ) of the third caulking part (10 ₂ , 10 ₃ , 10 ₆ , 10 ₇ ) It is preferable to set it so as to be equal to or larger than the gap (d ₂₃ , d ₂₄ ) in the circumferential direction (C).

  In addition, although the code | symbol in the said parenthesis is for contrast with drawing, it has no influence on the structure of each claim by this.

  According to the first aspect of the present invention, the fitting of the caulking portion is made into an interference fit in the radial direction of the core plate, and the circumferential direction of the core plate is set as a clearance fit having a predetermined gap, so that centrifugal force can be applied. It is possible to prevent a tensile residual stress generated when caulking is caulked in the circumferential direction portion of caulking subjected to stress based on the stress. Further, when the rotor core is rotated, the gap is such that the convex portion and the concave portion of the caulking portion to be fitted come into contact with each other, so that stress based on centrifugal force is not generated in the portion where the residual stress of the caulking portion is generated. Can receive. In addition, a plurality of caulking portions are provided on one core plate piece, and among these caulking portions, the concave portion of the caulking portion adjacent to the seam position of the core plate of the same layer is fitted with the convex portion of the caulking portion of the other layer. The above-mentioned gap formed together is made larger than the gap formed by fitting the concave portion of the other caulking portion with the convex portion of the caulking portion of the other layer, so that the caulking portion is positioned in the circumferential direction. Regardless, the difference in stress applied to each caulking portion of one core plate piece can be reduced as much as possible. The caulking portion is formed so as to separate the portion where the residual stress is generated from the portion receiving the centrifugal force, and a plurality of caulking formed on one core plate piece is adjusted by adjusting a gap between the caulking portions. Combined with the fact that the stress is uniformly generated in the part, it is possible to form a rotor core with high rotational strength.

  According to the invention which concerns on Claim 2, the magnitude | size of the said clearance gap between the recessed part of a 1st crimping part and the convex part of the 2nd crimping part of the core plate piece of another layer is made into the recessed part and other layer of a 2nd crimping part. Or less than the gap between the first caulking portion of the core plate piece and the concave portion of the third caulking portion and the convex portion of the third caulking portion of the core plate piece of the other layer. By setting so that it may become more than a clearance gap, a stress can be equally produced by the several crimping part formed in one core plate piece.

The schematic diagram which shows the rotor core which concerns on embodiment of this invention. The schematic diagram which shows the core plate piece which concerns on embodiment of this invention. It is a schematic diagram explaining the shape of the crimping part which concerns on embodiment of this invention, Comprising: (a) The top view of a crimping part, (b) AA sectional drawing of a crimping part, (c) BB of a crimping part Sectional drawing. BRIEF DESCRIPTION OF THE DRAWINGS It is a schematic diagram explaining the residual stress concerning the crimping part of the core plate piece which concerns on embodiment of this invention, Comprising: (a) The figure which shows the state before laminating | stacking a core plate piece, (b) Laminating | stacking a core plate piece The figure which shows the state after having performed, (c) The principal part enlarged view of FIG.4 (b). It is a schematic diagram explaining the stress based on the centrifugal force concerning the crimping part of the core plate piece which concerns on embodiment of this invention, Comprising: (a) The schematic diagram explaining the centrifugal force which arises in the core plate piece of a different layer, (b) FIG. 5 is an enlarged view of the main part of FIG. (A) Schematic diagram showing the relationship of a plurality of caulking portions provided on the core plate piece according to the embodiment of the present invention, (b) MM sectional view of FIG. 6 (a), (c) FIG. Sectional drawing which shows the state at the time of the core plate piece of () being laminated | stacked. The graph which shows the magnitude | size of the clearance gap between the convex part and the recessed part of the crimping part of another layer in each crimping part provided in the core plate piece which concerns on embodiment of this invention. The graph which shows the magnitude | size of the stress which arises in the convex part of each crimping part in the case where the magnitude | size of the clearance gap of FIG. 7 is adjusted for every crimping part, and the case where it does not adjust. The modification of the core plate piece which concerns on embodiment of this invention.

  Hereinafter, a rotor core of a rotating electrical machine according to an embodiment of the present invention will be described with reference to the drawings. In the following description, an interference fit refers to a fit of a type in which the width of the convex portion to be fitted is slightly larger than the width of the concave portion, and the gap fit is a gap between the convex portion and the concave portion. This means a type of fit with a predetermined gap.

  As shown in FIGS. 1 and 2, a rotor core 1 for an IPM motor (rotary electric machine) is formed by laminating a plurality of annular core plates 2. The core plate 2 is a plate-like member punched from the base material of the electromagnetic steel plate, and in order to improve the yield, the core plate 2 is equally divided (in this embodiment, five divisions) It is formed by connecting core plate pieces 3.

Specifically, one end portion of the core plate piece 3 is formed with a protruding portion 5a for connecting to the circumferentially adjacent core plate piece 3, and the other end portion is provided with the core plate piece. A fitting portion 5b into which the protruding portion 5a of the piece 3 is fitted is formed. In one core plate 2, joints D ₁ and D ₂ between these core plate pieces, that is, the number of joints between the projections 5 a and the fitting portions 5 b are formed in the same number as the number of the core plate pieces 3.

The core plate 2 is formed in an annular shape by connecting the core plate pieces 3 of the same shape to any one of the core plates 2, but the core plate piece overlaps (is adjacent to) the core plate 2 in the stacking direction. The three seams D ₁ and D ₂ are laminated by brick stacking in which the positions (phases) in the circumferential direction are alternately shifted for each layer. That is, the circumferential positions of the seams D ₁ and D ₂ of the core plate 2 are configured to be alternately different between the core plates overlapping in the stacking direction. For example, in FIG. 1, for convenience, when the core plate 2 stacked from the bottom of the rotor core 1 is divided into an odd layer and an even layer, the even layer core plate piece _3E has its end position (seam D). ₁ ) is arranged so that the position thereof is deviated by a predetermined angle with respect to the end position (seam D ₂ ) of the odd-numbered core plate pieces 3 _O.

  The core plate piece 3 has a magnet insertion hole 6 into which a rare earth permanent magnet such as a neodymium magnet is inserted, and a caulking portion 10 for fastening the plurality of stacked core plates 2 to each other in the circumferential direction. A plurality are formed. The caulking portions 10 are provided on the inner peripheral sides of both end portions of the magnet insertion hole 6, and the caulking portions 10 are caulked after the core plate 2 is temporarily assembled, whereby the rotor core 1 is connected to each core plate. It is possible to maintain the shape of 2 without being separated.

  Next, the caulking portion 10 will be described in detail. As shown in FIG. 2 and FIG. 3, the caulking portion 10 includes a convex portion (a dowel) 11 in which a core plate piece is projected to one side (a surface on one side in the stacking direction) by press molding, and the convex portion 11. Are formed on the back surface of the convex portion 11 of the core plate piece 3 (the same position as the convex portion 11 on the other side in the stacking direction). When the convex portions 11 of the core plate piece 3 are fitted, dowels are caulked.

  By the way, two stresses, a residual stress generated when caulking and a stress based on a centrifugal force applied when the rotor core 1 rotates, act on the caulking portion 10 including the convex portion 11 and the concave portion 12.

The residual stress is a stress caused by the caulking portion 10 is interference fit, A through C layer _L A stacked together is shown in FIG. _4, L B, _{L C} of the core plate pieces _{3 A, 3} B, 3 When _C will be described by way of example, the caulking portion 10 is formed as in the portion 10a serving as the interference fit is greater than the width _{W r2} of width _{W r1} is the interference _{d 1} minute only recess 12 of the protrusion 11 (See FIG. 4A).

As shown in FIG. 4B, the core plate pieces 3 _A , 3 _B , 3 _C are inserted into the concave portion 12 that is narrow by the tightening allowance d ₁ so that the core plate pieces 3 _A , 3 _B , 3 _C are While being connected to the stacking direction, as the core plate pieces 3 _B of FIG. 4 (c), when the protrusion 11 is press-fitted into the core plate pieces 3 _C recesses 12 of the other layer (C layer L _C) , projections 11 that are press-fitted is subjected to a C layer _{L C} stress Tc in the direction to compress the walls 12a of the recess 12 (direction toward the projections 11 of the C layer _{L C} recess from B layer _{L B)} of the.

On the other hand, when the convex portion of the other layers in the recess 12 (A layer _{L A)} is pressed, the the recess 12, the direction to expand from the wall 11a of the projections 11 of the A layer _{L A} (A layer _{L A} stress Tt is applied from the convex portion 11 into the recess 12 toward the direction) of the B layer _{L B} of. Then, the connecting portion I of the B layer L _B for connecting the projections 11 and the recesses 12, the stress Tc acting toward the opposite directions, Tt is consuming, stress Tc from these convex side and the concave side, Tt Balance, and the tensile residual stress described above is generated.

Further, the stress based on the centrifugal force is a stress generated in the caulking portion 10 when the rotor core 1 rotates. When the rotor core 1 rotates, as shown in FIG. 5A, the overlapping core plate pieces 3 _E , Centrifugal forces F _E and F _O act on 3 _O , respectively.

Centrifugal forces F _E and F _O acting on these overlapping core plate pieces 3 _E and 3 _O are converted into circumferential components F _EX and F _OX and radial components F _EY and F _OY of the core plate pieces 3 _E and 3 _O , respectively. 5B, since the radial components F _EY and F _OY both act in the direction from the center of the core plate 2 toward the outer diameter side, the overlapping core plate pieces 3 _{E 1} and 3 _O cannot receive each other's reaction force, and almost no force acts on the caulking portion 10 that connects the core plate pieces 3 _E and 3 _O of different layers.

On the other hand, the circumferential direction components F _OX , F _EX of the centrifugal forces F _E , F _O have different directions of action between the overlapping core plate pieces 3 _E , 3 _O , so that these core plate pieces 3 _E , 3 _O are connected. The caulking portions 10 can receive reaction forces from each other. That is, when attention is focused on the caulking portion ₁₀₈ formed on the end portion of the core plate piece 3 _E, by a core plate overlapping tends to move to the opposite side along the circumferential direction, the caulking portion ₁₀₈ includes a core Stress based on centrifugal force is generated in the circumferential direction of the plate 2. The radial components F _EY and F _OY of the centrifugal forces F _E and F _O are distributed and received by the caulking portion of the entire core plate 2, and particularly near the joints D ₁ and D _{2 of the} core plate piece 3. A large force acts on the crimped portion.

  The caulking portion 10 according to the present invention shown in FIG. 3 described above is configured so that the stress based on the centrifugal force and the residual stress of the tensile force do not occur in the same place, and the interference fit causes the residual stress. The portion 10a and the portion 10b where the stress due to the centrifugal force is generated are configured separately.

  Specifically, the caulking portion 10 includes a linear portion 10a in which the wall portions 11a and 12a in the circumferential direction (tangential direction of the core plate piece 3) C of the convex portion 11 and the concave portion 12 are formed linearly. The wall portions 11b and 12b in the radial direction R of the core plate 2 of the convex portion 11 and the concave portion 12 are formed in an arc shape having a predetermined curvature, and the arc portion 10b is formed between the straight portions 10a. The straight part 10a forms a part that is an interference fit of the caulking part 10.

That is, the caulking portion 10 has a width W _r2 in the radial direction R of the core plate 2 of the convex portion 11 which is a width between the linear wall portions 11a and 11a, and is a width between the linear wall portions 12a and 12a. The width W _{r1 of the} concave portion 12 in the radial direction R of the core plate 2 is larger (W _r2 > W _r1 ), and the fitting of the convex portions 11 and the concave portion 12 in the radial direction R is an interference fit.

In addition, since the caulking portion 10 is subjected to stress based on the centrifugal forces F _E and F _O in the circumferential direction, the arc portion 10b which is the circumferential end portion of the convex portion 11 and the concave portion 12 has an arc shape. wall 11b of the shape, and has a clearance fit with a predetermined gap _{d 2} between 12b. That is, the arc portion 10b forms a gap fitting portion of the caulking portion 10, and the width in the circumferential direction C of the core plate 2 of the convex portion 11 corresponding to the width between the arc-shaped wall portions 11b and 11b. W _c2 is smaller than the circumferential width W _c1 of the core plate 2 of the recess 12 corresponding to the width between the arcuate wall portions 12 b and 12 b (W _c1 > W _c2 ).

In the arc portion 10b, at the time when crimped crimping portion 10 painter, an arcuate wall portion 11b of the projections 11, and there is a gap d ₂ between the arc-shaped wall portion 12b of the recess 12 Therefore, the reaction force of the circumferential components F _OX and F _EX of the centrifugal forces F _E and F _O cannot be received between these wall portions 11b and 12b, but this gap d ₂ is caused by the rotation of the rotor core 1. When the overlapping core plate pieces 3 _E and 3 _O move away from each other in the circumferential direction, the core plate pieces 3 _E and 3 _O disappear due to a minute shift between the core plate pieces and elastic deformation of the core plate pieces 3 _E and 3 _O. 11 arcuate wall portions 11b and the arcuate wall portions 12b of the recesses 12 are formed so as to be in contact with each other. In other words, during rotation of the rotor core 1 has a gap d ₂ as with these projections 11 and recesses 12 are in contact.

Next, the difference depending on the position of the caulking portion 10 in the circumferential direction of the core plate piece 3 will be described. As shown in FIG. 6, a plurality of (eight in the present embodiment) caulking portions 10 ₁ to 10 ₈ are formed in one core plate piece 3 in the circumferential direction, and these caulking portions 10 ₁ to 10 ₁ are formed. 10 ₈ are provided at the first caulking portions 10 ₄ and 10 ₅ adjacent to the seam D ₂ position (circumferential position of the seam) of the core plate 2 overlapping in the stacking direction, and at the end of the core plate piece 3 _E. The second caulking portions 10 ₁ and 10 ₈ and the third caulking portions 10 ₂ , 10 ₃ , 10 ₆ and 10 ₇ formed between the first and second caulking portions.

As shown in FIGS. 6B and 6C, the rotor core 1 has the convex portions 11 ₄ and 11 ₅ and the concave portions 12 ₄ and 12 _{5 of} the first caulking portions 10 ₄ and 10 _5. respectively fitted in the recesses ₁₂ 1, 12 ₈ and the convex portions ₁₁ 1, 11 ₈ of the core plate piece ₃ second caulking portion ₁₀ of the _O 1, 10 ₈ other layers on the side, third crimping portions ₁₀ 2, 10 _{3, 10} 6, 10 ₇ of the projections _{11 2,} 11 _3, 11 6, 11 ₇ and the recess _{12 2,} 12 _3, 12 6, 12 _7, wherein the core plate piece of the other layer of the convex portion side and the concave side It fits into the concave portions 12 ₂ , 12 ₃ , 12 ₆ , 12 ₇ and the convex portions 11 ₂ , 11 ₃ , 11 ₆ , 1 ₁₇ of the third caulking portions 10 ₂ , 10 ₃ , 10 ₆ , 10 ₇ of 3 _O , respectively. Thus, the core plate 2 is laminated.

It fits of the first to the projections ₁₁ 1 to 11 ₈ of the third clamping parts ₁₀ 1 to 10 ₈ and the recess ₁₂ 1 to 12 _8, as described above, O and interference fit in the radial direction R of the core plate 2 is in conjunction with that, the the circumferential direction C of the core plate 2, O and clearance fit exists a gap _{d 2} as with these protrusions ₁₁ 1 to 11 ₈ and the recess ₁₂ 1 to 12 ₈ during rotation of the rotor core 1 is in contact it is, the gap d ₂ is for one of the caulking portion 10, between the recess 12 of the core plate pieces 3 _O1 caulking portion 10 of the convex portion 11 and the upper layer (the layer of the convex portion side) (for example, the convex portion side gap _{d 21)} with respect to the caulking portion 10 _4, between the convex portion 11 of the caulking portion 10 of the core plate pieces _{3 O2} recess 12 and the lower layer (layer of the concave portion side) (for example, caulking portion 10 ₄ for the recess-side gap d ₂₂ ), Formed.

Incidentally, the graph _{S 1} in FIG. 8, when the gap _{d 2} were the same among the first to third crimping portions ₁₀ 1 to 10 _8, the convex portions ₁₁ 1 to the caulking portions ₁₀ 1 to 10 ₈ but illustrates a magnitude of stress applied to 11 _8, when the same a gap _{d 2} between these first to third crimping portions ₁₀ 1 to 10 _8, the seam _D 1, _{D 2} of the core plate 2 first and second caulking portions _{10 1,} 10 _{4 adjacent} 10 5, the convex portion ₁₁ 1 of 10 _8, 11 _4, 11 5, 11 _8, particularly adjacent to the joint _{D 2} position of the core plate 2 overlapped in the stacking direction the first caulking portion ₁₀ 4, 10 ₅ protrusions ₁₁ 4, 11 ₅ large stress is seen to act to.

This is because when the rotor core 1 rotates, the end portion of the core plate piece 3 is more affected by centrifugal force than the center portion, and the first and _second joints adjacent to the joints D ₁ and D ₂ of the core plate 2 The stress acting on the second caulking portions 10 ₁ , 10 ₄ , 10 ₅ , and 10 ₈ is larger than the stress acting on the third caulking portions 10 ₂ , 10 ₃ , 10 ₆ , and 10 ₇ .

In particular, since the first caulking portions 10 ₄ and 10 ₅ are located at the upper and lower layer division positions (the seam D ₁ ) between the pair of adjacent first caulking portions 10 ₄ and 10 ₅ , different core plate pieces are used. 3 _o1 and 3 _o2 are engaged with the caulking portions 10 ₁ and 10 ₈ . When the rotor core 1 rotates and centrifugal force is generated, the upper and lower core plate pieces 3 _o1 and 3 _o2 move in a direction in which the core plate pieces adjacent to each other in the circumferential direction C are separated from each other with the joint D ₁ as a boundary. tries to core plate pieces ₃ o1 to move away of these _{separately, 3 o1, 3 o2, 3} o2 a first caulking portion ₁₀ 4 of the fitting, 10 _5, the core plate piece of the upper and lower layers _{3 o1} , 3 by the movement of _o2, for pulled away in the circumferential direction C in the same core plate pieces 3 in _E, large tensile stress acts.

On the other hand, the protrusion ₁₁ 1, 11 ₈ of the caulking portion ₁₀ 1, 10 ₈ adjacent to the seam _{D 1,} since the divided into separate core plate pieces ₃ o, _{3 o} at the joint _{D 1} as described above, divided Since no force is directly applied between the core plate pieces 3 _o and 3 _o and the force can be released to the joint D ₁ , the caulking portions 10 ₄ and 10 ₅ adjacent to the joint D ₂ The stress as large as the convex portions 11 ₄ and 11 ₅ does not occur.

In the present embodiment, as shown in FIGS. 6 and 7, the first and second caulking portions _{10 1,} 10 _4, 10 5, as high stress to 10 ₈ is not generated, the first caulking portion ₁₀ 4, 10 ₅ and the gaps d ₂₁ and d ₂₂ between the second caulking portions 10 ₁ and 10 ₈ of the core plate pieces 3 _{O 1} and 3 _{O 2} of the other layers are formed as third caulking portions 10 ₂ , 10 ₃ , 10 ₆ , 10 ₇ and the third caulking portions 10 ₂ , 10 ₃ , 10 ₆ , 10 ₇ of the core plate pieces 3 _{O 1} , 3 _{O 2} of the other layers are formed larger than the gaps d ₂₃ , d ₂₄ .

In particular to reduce the protrusion ₁₁ 4, 11 high tensile stress is likely to occur in ₅ first caulking portion ₁₀ 4, 10 ₅ to stress, first to third crimping portions ₁₀ 1 to 10 _8, the Of the gaps d ₂₁ and d ₂₂ between the first caulking portions 10 ₄ and 10 ₅ and the second caulking portions 10 ₁ and 10 ₈ of the core plate pieces 3 _O1 and 3 _O2 of the other layers, the first caulking portion 10 ₄ , the convex portion ₁₁ 4, 11 ₅ of 10 _5, the recess ₁₂ 1, 12 ₈ and between the gap _{d 21} of the second caulking portion ₁₀ 1, 10 ₈ of the core plate pieces _{3 O1} of other layers of the convex portion , a recess ₁₂ 4, 12 ₅ of the first caulking portion ₁₀ 4, 10 _5, the convex portion ₁₁ 1 of the second caulking portion ₁₀ 1, 10 ₈ of the core plate pieces _{3 O2} of other layers of the concave side, 11 ₈ and It is larger than the gap d ₂₂ between.

Then, the above-mentioned clearance relationship, the first to the projections ₁₁ 1 to 11 ₈ of the third caulking portion ₁₀ 1 to 10 ₈ of one core plate piece _{3 E,} the upper layer of the core plate pieces _{3 O1} of (other layer) Consider the gap between the caulking portions 10 ₁ to 10 ₈ recesses 12 _{1 to} 12 ₈ . As shown in FIG. 6 (b), the caulking portions ₁₀ 1 to 10 _8, together with the formed constant in any caulking portion width of the recess ₁₂ 1 to 12 _8, the convex portions ₁₁ 1 to 11 ₈ The width is changed by each caulking portion.

More specifically, the first caulking portion ₁₀ 4, 10 ₅ protrusions ₁₁ 4, 11 ₅ with the most reduced form width _{W c24, W c25,} and then the second caulking portion ₁₀ 1, 10 ₈ projections ₁₁ 1, 11 ₈ and the first caulking portion ₁₀ 4, 10 ₅ side of the third caulking portion ₁₀ 3, 10 ₆ projections ₁₁ 3 of 11 ₆ width _W of _c21, W _{c 28,} W _{c23, W c 26} is formed small, and has a width _{W c22, W c27} of the second caulking portion ₁₀ 1, 10 ₈ third crimping portions of the side ₁₀ 2, 10 ₇ of the projections ₁₁ 2, 11 ₇ the greatest.

That is, as shown in FIG. 7, a gap formed by the convex portions ₁₁ 1 to 11 ₈ of the respective caulking portions ₁₀ 1 to 10 _8, first caulking portion ₁₀ 4, 10 ₅ of the gap _{d 21} is the largest, the Gaps d ₂₂ and d ₂₃ between the second caulking portions 10 ₁ and 10 ₈ and the third caulking portions 10 ₃ and 10 ₆ on the first caulking portions 10 ₄ and 10 ₅ side, and the third caulking portions 10 ₁ and 10 ₈ side on the third side The gaps d ₂₄ between the caulking portions 10 ₂ and 10 ₇ become smaller in this order.

Further, from the viewpoint of the concave portion side, the concave portions (12 ₁ , 12 ₈ ) of the second caulking portions 10 ₁ , 10 ₈ and the convex portions 11 of the first caulking portions 10 ₄ , 10 ₅ of the upper core plate piece 3 _O1 . _4, 11 in the circumferential direction C of the gap _{d 21} between _5, third crimping portions _{10 2,} 10 _3, 10 6, 10 ₇ recesses _{12 2,} 12 _3, 12 6, 12 ₇ and an upper core The gaps d ₂₃ , d _{24 in} the circumferential direction C between the convex portions 11 ₂ , 11 ₃ , 11 ₆ , 11 ₇ of the third caulking portions 10 ₂ , 10 ₃ , 10 ₆ , 10 ₇ of the plate piece 3 _{O 1} . Bigger than. Further, the circumference between the projecting portions ₁₁ 1, 11 ₈ of the first caulking portion ₁₀ 4, 10 ₅ recess ₁₂ 4, 12 ₅ and an upper core plate pieces ₃ second caulking portion ₁₀ 1 of the _O, 10 ₈ the size of the gap _{d 22} direction C, the second caulking portion ₁₀ 1, 10 ₈ recesses ₁₂ 1, 12 ₈ and the first caulking portion ₁₀ 4 of the upper core plate pieces _{3 O1,} 10 ₅ protrusions 11 ₄ of the , the circumferential direction C and the gap _{d 21} below, third crimping portions _{10 2,} 10 _3, 10 6, 10 ₇ recesses _{12 2,} 12 _3, 12 6, 12 ₇ and another layer between 11 ₅ projections ₁₁ 2 third crimping portions _{10 2,} 10 _3, 10 6, 10 ₇ of the core plate pieces _3, 11 _3, 11 6, 11 circumferential direction C of the gap _d 23 between the _{7, d 24} It can be said that it was set as above.

The range of _{E 1} in FIG. 7 is a set allowable range of the gap _{d 21} of the first caulking portion ₁₀ 4, 10 ₅ protrusions side, the convex portion side of the second caulking portion ₁₀ 1, 10 ₈ It is substantially approximately matches the set permissible range _{E 2} of the gap _{d 22.} Also, _{E 3} is the allowable setting range of the third crimping portions ₁₀ 2, 10 ₇ the convex side of the gap _{d 22, d 23, d 26} , d 27, of the third crimping portions ₁₀ 2, 10 ₇ The gaps d ₂₂ , d ₂₃ , d ₂₆ , d ₂₇ on the convex side are larger as they are closer to the first caulking parts 10 ₄ , 10 _5, and the seam D ₂ position of the core plate 2 overlapping in the stacking direction; at an intermediate point between the seam D ₁ is an end position of the core plate piece 3 _E, is set as the gap becomes smaller.

  Next, the operation of the rotor core 1 according to the embodiment of the present invention will be described. As shown in FIG. 1, the operator forms the core plate 2 by arranging the core plate pieces 3 in a ring shape in a cage (not shown) and forms the core plate 2 on the core plate. The pieces 3 are stacked. At this time, since the cage is rotated by a predetermined angle every time the layer of the core plate changes, the core plate 2 is arranged in the circumferential direction of the joints D1 and D2 between the core plate 2 and the core plate piece 3 adjacent to each other in the stacking direction. The layers are stacked so that the positions of C are alternately shifted. Further, when the layer of the core plate 2 is changed, the core plate 2 is blurred by a press, so that the stacked core plates 2 are connected in the stacking direction. A predetermined number of core plates 2 are laminated to form the rotor core 1.

  That is, when the temporarily assembled core plate 2 is pressed, the straight portion 10a of the caulking portion 10 is fitted by interference fit, and the core plate pieces 3 are connected in the stacking direction, and a plurality of these core plates stacked together 2 forms one rotor core 1. Then, the operator inserts a neodymium magnet into the magnet insertion hole 6 of the rotor core 1 to form a rotor, and creates a rotating electrical machine by incorporating the rotor.

By the way, when electric power is supplied to the rotating electrical machine and the rotor rotates, a centrifugal force corresponding to the rotational speed of the rotor is generated in the core plate piece 3 of the rotor core 1. When this centrifugal force is generated, as shown in FIG. 5, each core plate piece 3 has a direction in which the overlapping core plate pieces 3 _O and 3 _E are separated in the circumferential direction C of the core plate 2 (for example, the core plate piece 3 _E In the case of, it tries to move in the M direction in the figure. Then, in the caulking portion 10 that connects the overlapping core plate pieces 3 _O and 3 _E , the gap d ₂ between the wall portions 11 b and 12 b of the arc portion 10 b that is the gap fitting is a circle of the core plate pieces 3 _O and 3 _E. Loss due to circumferential displacement or elastic deformation. And the force of the circumferential direction component of the centrifugal force applied to the caulking portion 10 is received by the contact of these arcuate wall portions 11b and 12b.

At this time, the first to third crimping portions ₁₀ 1 to 10 ₈ provided in the core plate piece _{3 E} is crimped portion 10 of the convex portions ₁₁ 1 to 11 ₈ and the core of the other layer plate pieces _{3 O1, 3 O2} from the concave portion ₁₂ 1 to 12 ₈ and the gap is formed between _d 21 _{to d 24} is narrower caulking portions ₁₀ 1 to 10 _{8 1} 10 _8, the arc-shaped wall portion 11b, 12b abut. Specifically, the third caulking portions 10 ₂ and 10 _{7 on} the second caulking portion side, the third caulking portions 10 ₃ and 10 ₆ on the first caulking portions 10 ₄ and 10 ₅ side, and the second caulking portions 10 ₁ and 10, respectively. ₈ and finally, the wall portions 11b and 12b of the first caulking portions 10 ₄ and 10 ₅ come into contact with each other, and the force of the circumferential component is received by the caulking portions 10 ₁ to 10 _{8 in a} distributed manner.

  As described above, when the centrifugal force applied to the caulking portion 10 is received by the abutting of the wall portions 11b and 12b formed in an arc shape, the stress is not concentrated, so that a large stress (centrifugal force) can be resisted. Further, the fitting in the radial direction of the caulking portion 10 is an interference fit, and the arc portion 10b that receives the stress generated based on the centrifugal force is a gap fit. No stress is generated and it can withstand a greater centrifugal force.

Furthermore, since the portion to be the interference fit is constituted by the straight portion 10a linearly extending in the tangential direction of the core plate piece 3, the residual stress due to the interference fit can be uniformly received at the straight portion. The overlapping core plate pieces 3 _O and 3 _E are easily displaced in the circumferential direction. Then, by separating the portion receiving the stress based on the centrifugal force and the portion where the residual stress is generated, the caulking portion can withstand a large centrifugal force, and the rotational strength of the rotor core 1 can be improved.

Further, a plurality of caulking portions in one core plate piece 3, among the plurality of the caulking portions, the seam D ₁ position of the core plate 3 _O seams D ₂ position and the same layer core plate 3 _E overlapping in the lamination direction Adjacent first and second caulking portions 10 ₄ , 10 ₅ , 10 ₁ , 10 ₈ are fitted with caulking portions 10 ₄ , 10 ₅ , 10 ₁ , 10 ₈ of the core plate pieces 3 _{O 1} , 3 _{O 2} of the other layers. and the gap _{d 21, d 22} be formed, third crimping portions _{10 2,} 10 _3, 10 6, 10 _7, the crimping portion ₁₀ 2 of the other _layer, 10 _3, 10 6, 10 ₇ and a fitting The difference between the stresses applied to the caulking portions 10 ₁ to 10 ₈ of one core plate piece 3 regardless of the positions of the caulking portions 10 ₁ to 10 ₈ by making the gaps d ₂₃ and d ₂₄ larger than the gaps d ₂₃ and d ₂₄ formed. As little as possible Door can be.

Further, the gap between the convex portion ₁₁ 4, 11 ₅ of the first caulking portion ₁₀ 4, 10 _5, the recess ₁₂ 1, 12 ₈ of the second caulking portion ₁₀ 1, 10 ₈ of the upper core plate pieces _{3 O1} By making d ₂₁ larger than the other gaps d _{22 to} d ₂₄ , the convex portions 11 _{4 of} the first caulking portions 10 ₄ and 10 ₅ in which the largest tensile stress acts among the caulking portions 10 ₁ to 10 _8. , it is possible to effectively reduce the stress generated in 11 _5.

  Thereby, the strength of the caulking portion is improved, and even in the rotor core 1 in which the core plate 2 is divided, the necessary rotational strength can be achieved with a radially compact configuration. Further, since the core plate 2 can be formed with a small thickness, an eddy current generated in the rotor core 1 can be suppressed to be small, and a rotating electrical machine having a high yield and high efficiency can be produced using the rotor core 1. it can.

In the present embodiment, the size of the gap d ₂ between the convex portion 11 of the caulking portion 10 and the concave portion 12 of the caulking portion 10 of the core plate pieces 3 _O1 and 3 _O2 of the other layers is adjusted. However, while the width W _c1 of the concave portion 12 of the caulking portion is made constant and the widths W _{c21 to} W _c28 of the convex portions 11 of the respective caulking portions 10 are changed, the convex portion 11 of the caulking portion 10 is naturally changed. The width W _c2 of each of the caulking portions may be changed and the width W _c1 of each caulking portion may be changed. Further, as shown in FIG. 9, the position of the convex portion 11 with respect to the concave portion 12 is shifted, and when the rotor core 1 rotates, only the gap d ₂ on the side where the convex portion and the concave portion of the caulking portion abut is adjusted. Also good.

  Further, the caulking portion 10 may be formed so that the linear portion 10a is long by forming the arc portion 10b by two arcs of curvature or by one large arc having a small curvature.

  Further, in the present embodiment, the caulking portion 10 is formed such that the circumferential length is longer than the radial length, but the radial length may be longer than the circumferential length. good.

  Furthermore, the above-described caulking structure may be combined in any way, and naturally it is not limited to the IPM motor and may be used for the rotor core of any rotating electrical machine.

DESCRIPTION OF SYMBOLS 1 Rotor core 2 Core plate 3 Core plate piece 10 ₄ , 10 ₅ 1st caulking part 10 ₁ , 10 ₈ 2nd caulking part 10 ₂ , 10 ₃ , 10 ₆ , 10 ₇ 3rd caulking part 10a Part)
10b Part (arc part) which becomes gap fitting
11 convex portion 11 ₄ , 1 ₁₅ first caulking portion convex portion 11 ₁ , _{1 18} second caulking portion convex portion 11 ₂ , 11 ₃ , 11 ₆ , 1 ₁₇ third caulking portion convex portion 12 concave portion 12 ₄ , 12 ₅ 1st caulking part recesses 12 ₁ , 12 ₈ 2nd caulking part recesses 12 ₂ , 12 ₃ , 12 ₆ , 12 ₇ 3rd caulking part recesses W _r1 recessed part width W _r2 convex part Core plate radial width W _c1 concave core plate circumferential width W _c2 convex core plate circumferential width d ₂ gap d ₂₁ convex portion of first caulking portion and other layer on convex portion side A gap d ₂₂ between the second caulking portion of the core plate piece d ₂₂ and a gap d ₂₃ between the concave portion of the first caulking portion and the convex portion of the second caulking portion of the core plate piece of the other layer on the concave side. ₂₄ third gap D between the third crimping portions of the core plate piece of the caulking portion and the other layer , _{D 2} seams R radial direction C circumferential direction

Claims (2)

A plurality of annular core plates are stacked, and arc-shaped core plate pieces obtained by equally dividing the core plate are connected to form one layer of the core plate, and the core plate of the core plate In the rotor core of the rotating electrical machine configured so that the circumferential position of the seam of the piece is alternately different for each layer,
The core plate piece is formed at the same position as the convex portion on the one side in the stacking direction and the convex portion on the other side in the stacking direction, and when the core plate piece is stacked, A plurality of caulking portions having a concave portion that fits with the convex portion of the core plate piece of the other layer in contact with the surface in the circumferential direction of the core plate;
The plurality of caulking portions include a first caulking portion adjacent to a joint position of the core plate piece of the other layer, a second caulking portion provided at an end portion of the core plate piece, and the first and second caulking portions. And a concave portion of the first caulking portion is fitted to a convex portion of the second caulking portion of the core plate piece of the other layer, and the second caulking portion is formed between the second caulking portions. A concave portion of the caulking portion fits into a convex portion of the first caulking portion of the core plate piece of the other layer, and a concave portion of the caulking portion of the third plate is a portion of the third caulking portion of the core plate piece of the other layer. Laminate the core plate so as to fit into the convex part,
The fitting of the convex portion and the concave portion of the first to third caulking portions is an interference fit in the radial direction of the core plate, and a gap fit with a predetermined gap in the circumferential direction of the core plate, and A circumferential clearance between the concave portion of the second caulking portion and the convex portion of the first caulking portion of the core plate piece of the other layer is defined as a concave portion of the third caulking portion and the core plate piece of the other layer. A rotor core for a rotating electrical machine, wherein the rotor core is larger than a circumferential clearance between the third caulking portion and the convex portion. The size of the gap in the circumferential direction between the concave portion of the first caulking portion and the convex portion of the second caulking portion of the core plate piece of the other layer is set as the concave portion of the second caulking portion and the other layer. A circumferential gap between the convex portion of the first caulking portion of the core plate piece and a concave portion of the third caulking portion and a convex portion of the third caulking portion of the core plate piece of the other layer; Set to be greater than or equal to the circumferential clearance between
The rotor core of the rotary electric machine according to claim 1.

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