JP5405996B2 - Permanent magnet embedded rotor - Google Patents

Description

  The present invention relates to a permanent magnet embedded rotor, and more particularly to high efficiency of the rotor.

  As shown in FIG. 20, a general embedded permanent magnet rotor includes a rotating shaft 4, a laminated iron core 72, and a permanent magnet 7. The laminated iron core 72 is formed by laminating magnetic plates 45 obtained by processing steel plates into a required shape.

  The rotating shaft 4 is fitted in the central portion of the laminated iron core 71. As shown in FIG. 20, a permanent magnet embedding hole 6 is formed in a substantially circumferential shape near the outer periphery of the laminated iron core 71, and the permanent magnet 7 is embedded in the permanent magnet embedding hole 6.

  FIG. 21 shows a partially enlarged view of the region K in FIG. 20. In the case of a conventional rotor, the region between the end portions 7a and 7b of adjacent permanent magnets does not contribute to the rotation of the motor. Leakage magnetic fluxes 39 and 40 are generated. The leakage magnetic fluxes 39 and 40 are magnetic fluxes that are closed inside the rotor without the magnetic flux generated from the permanent magnets reaching the stator side.

  Due to the influence of the leakage magnetic fluxes 39 and 40, the effective magnetic flux acting for the rotation of the motor is reduced, which causes the motor performance to deteriorate. By preventing the leakage magnetic fluxes 39 and 40, the performance of the motor can be improved.

  In Patent Document 1, in order to reduce leakage magnetic flux between magnetic poles and reduce stress concentration due to centrifugal force during high-speed rotation, gaps and connecting portions are alternately arranged in the circumferential direction between a plurality of insertion holes for inserting permanent magnets. A core (steel plate) is formed so as to be arranged, and the cores are rotated and laminated one by one by the magnetic pole angle to constitute a rotor core.

  Moreover, in patent document 2, the iron loss is reduced by forming a thin part by an etching process.

Japanese Patent Laying-Open No. 2007-53864 (stages 0016 to 0019, FIG. 2) JP 2009-33908 A (0121 stage, FIG. 17)

  However, in the conventional permanent magnet embedded rotor, a gap portion, a slot, a thin portion, etc. are provided between the magnet insertion holes to reduce the leakage magnetic flux, but there is a problem that the strength is lowered.

  The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a permanent magnet embedded rotor that suppresses leakage magnetic flux while suppressing a decrease in strength of a laminated core of the rotor. To do.

The permanent magnet embedded rotor according to the present invention is:
A plurality of permanent magnets arranged substantially circumferentially so that adjacent magnetic poles are different from each other;
A rotating core hole is provided at the center of the rotating shaft, the plurality of permanent magnets are embedded in the vicinity of the peripheral end, and a laminated core formed by laminating magnetic plates;
A shielding portion made of a resin material disposed in the vicinity of the circumferential end portions of the adjacent permanent magnets at the edge portion of the magnetic plate;
A rotating shaft fitted into the rotating shaft hole of the laminated core formed by laminating the magnetic plates , and
The shielding portion is formed by filling a groove or hole provided in each magnetic plate to be laminated with a resin material, and is provided while being shifted laterally in the laminating direction between adjacent magnetic plates. Or it is formed in the hole.

  According to the present invention, by providing a shielding portion made of a resin material in the vicinity of the magnetic pole ends of adjacent permanent magnets at the edge of the magnetic plate, magnetic flux leakage is reduced and motor characteristics are improved. It is possible to prevent a decrease in strength of the laminated core.

It is an axial direction longitudinal cross-sectional view which shows the structure of the permanent magnet embedded type motor provided with the permanent magnet embedded type rotor which concerns on this invention. 1 is an axial cross-sectional view illustrating a configuration of a permanent magnet embedded motor including an embedded permanent magnet rotor according to the present invention. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a plan view, a plan enlarged view, and an axial longitudinal sectional enlarged view showing a configuration of a permanent magnet embedded rotor according to a first embodiment of a permanent magnet embedded rotor according to the present invention. It is a front view which shows the structure of the laminated board used for manufacture of the permanent magnet embedded type rotor in Embodiment 1 of the permanent magnet embedded type rotor which concerns on this invention. It is a schematic diagram explaining the etching process of the magnetic board in Embodiment 1 of the permanent magnet embedded type rotor which concerns on this invention. It is a schematic diagram explaining the etching process of the magnetic board in Embodiment 1 of the permanent magnet embedded type rotor which concerns on this invention. It is the front view and axial direction cross-sectional view which show the structure of the permanent magnet embedded type rotor formed by the manufacturing method in Embodiment 1 of the embedded permanent magnet rotor which concerns on this invention. It is sectional drawing which shows the structure of the injection die used for manufacture of the permanent magnet embedded type rotor in Embodiment 1 of the permanent magnet embedded type rotor which concerns on this invention in the state by which the laminated core was inserted. It is the top view which shows other structures of the permanent magnet embedded type rotor in Embodiment 1 of the permanent magnet embedded type rotor which concerns on this invention, a plane enlarged view, and an axial direction longitudinal cross-sectional enlarged view. It is the top view which shows the structure of the permanent magnet embedded type rotor in Embodiment 2 of the permanent magnet embedded type rotor which concerns on this invention, a plane enlarged view, and an axial direction longitudinal cross-sectional enlarged view. It is the top view which shows the structure of the permanent magnet embedded type rotor in Embodiment 3 of the permanent magnet embedded type rotor which concerns on this invention, a plane enlarged view, and an axial direction longitudinal cross-sectional enlarged view. It is the top view which shows the structure of the permanent magnet embedded type rotor in Embodiment 4 of the permanent magnet embedded type rotor which concerns on this invention, a plane enlarged view, and an axial direction longitudinal cross-sectional enlarged view. It is the plane enlarged view and cross-sectional enlarged view explaining the intensity | strength of the laminated iron core used for the permanent magnet embedded rotor in Embodiment 4 of the permanent magnet embedded rotor which concerns on this invention. It is the top view which shows other structures of the permanent magnet embedded type rotor in Embodiment 4 of the permanent magnet embedded type rotor which concerns on this invention, a plane enlarged view, and an axial direction longitudinal cross-sectional enlarged view. It is the top view which shows other structures of the permanent magnet embedded type rotor in Embodiment 4 of the permanent magnet embedded type rotor which concerns on this invention, a plane enlarged view, and an axial direction longitudinal cross-sectional enlarged view. It is the top view which shows the structure of the permanent magnet embedded type rotor in Embodiment 5 of the permanent magnet embedded type rotor which concerns on this invention, a plane enlarged view, and an axial direction longitudinal cross-sectional enlarged view. It is the top view which shows other structures of the permanent magnet embedded type rotor in Embodiment 5 of the permanent magnet embedded type rotor which concerns on this invention, a plane enlarged view, and an axial direction longitudinal cross-sectional enlarged view. It is the top view which shows other structures of the permanent magnet embedded type rotor in Embodiment 5 of the permanent magnet embedded type rotor which concerns on this invention, a plane enlarged view, and an axial direction longitudinal cross-sectional enlarged view. It is the top view which shows other structures of the permanent magnet embedded type rotor in Embodiment 5 of the permanent magnet embedded type rotor which concerns on this invention, a plane enlarged view, and an axial direction longitudinal cross-sectional enlarged view. It is a top view which shows the structure of the conventional permanent magnet embedded rotor. It is an enlarged plan view explaining the magnetic path of the conventional permanent magnet embedded rotor.

Hereinafter, various embodiments of a permanent magnet embedded rotor according to the present invention will be described with reference to the drawings.
Embodiment 1 FIG.
FIG. 1 is an axial longitudinal sectional view showing a configuration of an embedded permanent magnet motor 200 including an embedded permanent magnet rotor 100 according to Embodiment 1 of the present invention, and FIG. 2 is an axial transverse sectional view. It is. FIG. 3A is an enlarged view of the rotor 100 provided in the permanent magnet embedded motor 200 of FIG. 3B is an enlarged view of the region A in FIG. 3A, and FIGS. 3C and 3D are cross-sectional views taken in the direction of the arrow B in FIG. C direction arrow sectional drawing is shown.

  As shown in FIGS. 1 and 2, the permanent magnet embedded motor 200 includes a rotor 100 and a stator 111 and is covered with an outer structure 1. The stator 111 is configured such that a winding 3 is applied to a stator laminated core 50 obtained by laminating a silicon steel plate into a predetermined shape and then laminated, and connected to a power supply unit by a lead wire (not shown). . The number of slot openings 111a of the stator 111 and the number of magnetic poles of the rotor 100 are appropriately determined in consideration of characteristics.

  In FIG. 3A, the rotor 100 includes a rotating shaft 4, a rotor laminated core 60 that is a laminate of magnetic plates made of silicon steel plates processed into a predetermined shape, and the number of magnetic poles on the rotor laminated core 60. It is composed of permanent magnets 7 corresponding to the number of magnetic poles embedded and mounted in the magnet-embedding holes 6 formed in a divided manner. The permanent magnet 7 can be composed of a neodymium rare earth magnet.

  As shown in FIGS. 3C and 3D, the rotor laminated core 60 is formed by laminating first laminated plates 60a-1, 60a-2,..., 60a-n (n is an integer). Formed. In the region A at the edge of the first laminated plates 60a-1, 60a-2,... 60a-n, the region between the end 7a and the end 7b of the adjacent permanent magnets 7 A concave groove 8a is formed in the upper part. The groove 8a is formed by, for example, etching.

  A shielding part 81 is formed in the groove part 8a by filling and curing a resin material. The shielding part 81 reduces leakage of magnetic flux between the end part 7a and the end part 7b of the permanent magnet, and prevents a decrease in strength due to the groove part 8a.

  Next, an example of a manufacturing method of the permanent magnet embedded rotor according to the first embodiment will be described. The permanent magnet embedded rotor according to the first embodiment is manufactured by, for example, a method similar to the manufacturing method described in Japanese Patent No. 3585814.

  FIG. 4 shows the rotor laminated core 61 of the permanent magnet embedded rotor 101 formed by one manufacturing method according to the first embodiment. (A) First laminated plate 61a and (b) Second laminated plate 61b It is a top view which shows a structure. FIG. 5 and FIG. 6 are schematic diagrams for explaining the etching process of the magnetic plate for forming the first laminated plate 61a and the second laminated plate 61b.

  Fig.7 (a) is a top view which shows the structure of the rotor lamination | stacking iron core 61 formed with this manufacturing method, FIG.7 (b) shows the D direction arrow directional cross-sectional view in Fig.7 (a). FIG. 8 is a cross-sectional view showing the structure of an injection mold used for manufacturing the embedded permanent magnet rotor 101 in FIG. 7 with the rotor laminated core 61 inserted.

  First, as shown in FIG. 4A, a first laminated plate 61a having a hole 61c, a slit 61d, an injection hole 61e, and a shaft hole 61f as a rotation shaft hole, and FIG. 4B. A second laminated plate 61b having a hole 61c, an injection hole 61e, and a shaft hole 61f is formed by punching or the like.

  Next, groove portions 8a facing the outer periphery are provided at the outer peripheral side corners of the holes 61c of the first laminated plate 61a and the second laminated plate 61b. The groove 8a is formed by etching a silicon steel plate as shown in FIG.

  In FIG. 5 (a), masking 10 is applied to necessary portions in order to prevent dissolution of the silicon steel plate by the etching solution on both surfaces of the silicon steel plate 9 as the first laminated plate 61a or the second laminated plate 61b. .

  A groove 8a shown in FIG. 5 (b) is formed by spraying an etching solution on the silicon steel plate 9 treated with the masking 10 and dissolving the silicon steel plate 11 on the portion where the masking 10 is not applied. Here, as the silicon steel plate 9 to be etched, one without an insulating film is used.

  The hole 61c, the slit 61d, the injection hole 61e, and the shaft hole 61f may also be formed by etching. As shown in FIG. 6 (a), by dissolving the portion of the silicon steel plate 12 where the masking 10 is not provided at the same position on both sides of the silicon steel plate 9, the hole 61c as the through hole shown in FIG. 6 (b), A slit portion 61d, an injection hole portion 61e, and a shaft hole portion 61f are formed.

  In this case, at the time of forming the hole 61c, the slit 61d, the injection hole 61e, and the shaft hole 61f, the groove 8a can be simultaneously formed, thereby simplifying the manufacturing process. it can.

  Subsequently, as shown in FIG. 7, the second laminated plate 61 b is laminated, and the first laminated plate 61 a is arranged at both ends thereof to form the rotor laminated iron core 61. Each of the second laminated plates 61b and the first laminated plates 61a arranged at both ends thereof are laminated so that the respective hole portions 61c, the injection hole portion 61e, and the shaft hole portion 61f are aligned with each other, For example, the rotor laminated iron core 61 is formed by being fixed and integrated by, for example, punching or welding.

  Next, as shown in FIG. 8, the rotor laminated core 61 formed as described above is inserted into the bottomed hole portion 13 a of the lower mold 13, and the rotor laminated iron core 61 is inserted into each hole portion 61 c. A predetermined number of permanent magnets 7 are inserted into each.

  Next, the upper die 14 is placed on the upper portion of the lower die 13 so that each injection hole portion 14c coincides with the position of each injection hole portion 61e of the rotor laminated iron core 61. After the mold 14 and the lower mold 13 are fastened and fixed, a resin material 80 made of a thermosetting resin is injected from the resin supply hole 14a with a predetermined pressure.

  Subsequently, the resin material 80 sequentially flows through the branch hole portions 14b of the upper mold 14, the injection hole portions 14c, and the injection hole portions 61e of the rotor laminated iron core 61, and as shown in FIG. The permanent magnets 7 are filled with the permanent magnets 7 being pressed from both side surfaces thereof. Further, the resin material 80 guided to each hole 61c is guided and filled in the groove 8a formed in the region between the end 7a and the end 7b of the adjacent permanent magnets 7.

  Next, by heating in this state, the resin material 80 is cured and integrated into the rotor laminated core 61. At this time, the resin material 80 filled in the groove 8a is also cured, and the shielding part 81 is formed in the groove 8a. Since the shielding part 81 is formed by filling and curing the resin material 80, the laminated plates are fixed to each other, can be reinforced against tensile stress in the laminating direction, and strength reduction can be prevented.

  Next, the tightening portion (not shown) is loosened, the upper die 14 is removed, the rotor laminated iron core 61 is taken out from the lower die 13, and the rotor shaft 4 is fitted and fixed to the shaft hole portion 61f. Thus, the permanent magnet embedded rotor 101 is completed.

  As described above, in the first embodiment, the shielding portion 81 is provided in a part of the region through which the leakage magnetic flux between the end portion 7a and the end portion 7b of the permanent magnet 7 of the embedded permanent magnet rotors 100 and 101 passes. As a result, the leakage of magnetic flux can be reduced, the effective magnetic flux can be increased, and the motor characteristics can be improved by increasing the torque of the motor, improving efficiency, suppressing temperature rise, and the like.

  Further, since the shielding portion 81 is formed of a resin material and the laminated plates are fixed to each other by an adhesive force, the shielding portion 81 can be reinforced against compressive stress and tensile stress in the laminating direction, and strength reduction can be prevented.

  In the first embodiment, in the rotor laminated iron core 61, the shielding portion 81 of each laminated plate is configured by the groove portion 8a having the same shape. However, the present invention is not limited to this.

  FIG. 9 shows a permanent magnet embedded rotor 102 having another configuration of the first embodiment. FIG. 9A is an enlarged view of the permanent magnet embedded rotor 102. 9B is an enlarged view of the region A in FIG. 9A, and FIGS. 9C and 9D are cross-sectional views taken in the direction of the arrow B in FIG. 9B, respectively. C direction arrow sectional drawing is shown.

  For example, as shown in FIG. 9, the second laminated plate 60a-1, 60a-2,..., 60a-n (n is an integer) is formed with respect to two grooves 8a. The plates 60b-1, 60b-2,..., 60b-n (n is an integer) are formed with one groove 8b positioned between the two grooves 8a, and the first laminated plate 60a and the first laminated plate 60a It is good also as the shielding parts 81 and 82 comprised by laminating | stacking the 2nd laminated board 60b alternately.

  In this case, the rotor laminated iron core 62 has a configuration in which the shielding portions 81 and the shielding portions 82 are alternately laminated and shifted laterally in the axial direction. Can be prevented.

Embodiment 2. FIG.
In the embedded permanent magnet rotor of the first embodiment, the shielding portion is provided in the groove shape formed in the rotor laminated iron core. In the second embodiment, a case where the shielding portion is provided in the hole shape will be described.

  FIG. 10 shows the embedded permanent magnet rotor 103 of the second embodiment. FIG. 10A is an enlarged view of the embedded permanent magnet rotor 103. FIG. 10 (b) is an enlarged view of the region A in FIG. 10 (a), and FIG. 10 (c) and FIG. 10 (d) are cross-sectional views taken in the direction of arrow B in FIG. 10 (b), respectively. C direction arrow sectional drawing is shown.

  As shown in FIG. 10, in the embedded permanent magnet rotor 103 according to the second embodiment, the rotor laminated iron core 63 has a hole 15a having a concave shape in the bottom instead of the grooves 8a and 8b in the first embodiment. , 63a-n (n is an integer) are formed by laminating the first laminated plates 63a-1, 63a-2,. The hole 15a is formed by, for example, etching.

  A shielding portion 83 is formed in the hole portion 15a by filling and curing a resin material. Other configurations are the same as those in the first embodiment, and the same reference numerals as those in FIG.

  The shielding part 83 reduces leakage of magnetic flux between the end part 7a and the end part 7b of the permanent magnet, and prevents a decrease in strength due to the hole part 15a. Further, in the second embodiment, the shielding portion 83 is formed in the hole portion 15a, so that not only the radial direction in the surface but also the circumferential direction can be reinforced against the compressive stress as compared with the groove portion 8a in the first embodiment. , Strength reduction can be prevented.

  Regarding the method for manufacturing the embedded permanent magnet rotor according to the second embodiment, for example, a method similar to the manufacturing method described in Japanese Patent No. 3585814 can be applied as in the first embodiment, and the description thereof is omitted.

  As described above, in the second embodiment, the shielding portion 83 is formed by filling and curing the resin material in the hole portion 15a, and the laminated plates are fixed to each other. In addition, it is possible to reinforce not only the in-plane radial direction but also the circumferential direction against the compressive stress, and the strength reduction can be prevented.

  In the first embodiment and the second embodiment, the recessed groove portions 8a and 8b or the hole portion 15a are formed below, but the present invention is not limited to this. The same effect can be obtained by forming concave groove portions 8a, 8b or hole portions 15a on each of them.

Embodiment 3 FIG.
In the embedded permanent magnet rotor of the second embodiment, the shielding portion is provided in the hole provided in the same direction surface of each layer of the laminated plate forming the rotor laminated iron core. A case where a shielding part is provided in a gap formed by a hole corresponding to each layer will be described.

  FIG. 11 shows the embedded permanent magnet rotor 104 of the third embodiment. FIG. 11A is an enlarged view of the permanent magnet embedded rotor 104. 11B is an enlarged view of the region A in FIG. 11A, and FIGS. 11C and 11D are cross-sectional views taken in the direction of the arrow B in FIG. C direction arrow sectional drawing is shown.

  As shown in FIG. 11, in the permanent magnet embedded rotor 104 according to the third embodiment, first laminated plates 63a-1, 63a-2,..., 63a- having a concave hole portion 15a formed below. n (n is an integer) and second laminated plates 63b-1, 63b-2,..., 63b-n (n is an integer) having concave holes 15b formed thereon are alternately laminated, The openings 15 are combined with each other to form the gap 15. The holes 15a and 15b are formed by, for example, etching.

  A shielding portion 84 is formed in the gap portion 15 by filling and curing a resin material. Other configurations are the same as those in the first embodiment, and the same reference numerals as those in FIG.

  The shielding portion 84 reduces leakage of magnetic flux between the end portions 7a and 7b of the permanent magnet and prevents a decrease in strength due to the gap portion 15.

  Moreover, the space | gap part 15 straddles 1st laminated board 63a-1, 63a-2, ..., 63a-n and 2nd laminated board 63b-1, 63b-2, ..., 63b-n. By forming it, not only can it be reinforced against tensile stress and compressive stress in the stacking direction as in the shielding portions of Embodiment 1 and Embodiment 2, but it can be reinforced against shear stress in the stacking direction, Strength reduction can be prevented.

  Regarding the method for manufacturing the embedded permanent magnet rotor according to the third embodiment, for example, a method similar to the manufacturing method described in Japanese Patent No. 3585814 can be applied as in the first embodiment, and the description thereof is omitted.

  As described above, in the third embodiment, the shielding portion 84 is formed of the first laminated plates 63a-1, 63a-2,..., 63a-n and the second laminated plates 63b-1, 63b-2,. , 63b-n is formed by filling and curing the resin material in the gap portion 15 so as to fix the laminates to each other, so that not only the tensile stress and the compressive stress in the stacking direction can be reinforced, but also the stacking lateral direction It is possible to reinforce against the shear stress of and prevent the strength from being lowered.

Embodiment 4 FIG.
In the embedded permanent magnet rotor of the third embodiment, the shielding portion is provided in the gap formed between the layers of the laminated plate forming the rotor laminated iron core. In the fourth embodiment, this gap is formed. It shows about the case where uneven | corrugated shape is provided in the bottom part of each hole part.

  FIG. 12 shows the permanent magnet embedded rotor 105 of the fourth embodiment. FIG. 12A is an enlarged view of the embedded permanent magnet rotor 105. 12 (b) is an enlarged view of the region A in FIG. 12 (a), and FIGS. 12 (c) and 12 (d) are cross-sectional views in the direction of arrow B in FIG. 12 (b), respectively. C direction arrow sectional drawing is shown.

  As shown in FIG. 12, in the embedded permanent magnet rotor 105 according to the fourth embodiment, the rotor laminated core 65 has a concavo-convex shape in the radial direction at the bottoms of the holes 15a and 15b according to the third embodiment. The provided holes 16a and 16b are provided.

  65a-1, 65a-n (n is an integer) formed with holes 16a, and second laminates 63b-1, 63b-2 formed with holes 16b. ,..., 63b-n (n is an integer) are alternately stacked, and the openings are combined to form the gap 16. The holes 16a and 16b are formed by, for example, etching.

  A shielding portion 85 is formed in the gap portion 16 by filling and curing a resin material. In the shielding part 85, shielding part recesses 85a and 85b are formed corresponding to the hole protrusions 16c and 16d, respectively, having a concavo-convex shape at the bottoms of the holes 16a and 16b. Other configurations are the same as those in the first embodiment, and the same reference numerals as those in FIG.

  The shielding portion 85 reduces the leakage of magnetic flux between the end portions 7a and 7b of the permanent magnet, and prevents a decrease in strength due to the gap portion 16.

  Moreover, the shielding part 85 straddles 1st laminated board 65a-1, 65a-2, ..., 65a-n and 2nd laminated board 65b-1, 65b-2, ..., 65b-n. By forming, not only the tensile stress and the compressive stress in the stacking direction, but also the shear stress in the stacking lateral direction can be reinforced, as in the shielding part of the third embodiment, thereby preventing a decrease in strength. be able to.

  Further, the shielding portion 85 can be reinforced against radial tensile stress generated by the centrifugal force of rotation of the rotor 105 by providing a concave and convex shape in the radial direction on the bottom side of the holes 16a and 16b. A decrease can be prevented.

  Moreover, it can reinforce in the in-plane circumferential direction against compressive stress in the stacking direction, and can prevent a decrease in strength. Further, since the bonding area with the inner surface of the gap portion 16 is expanded, the laminated plates can be more firmly fixed to each other, and can be reinforced against the tensile stress in the laminating direction, thereby preventing the strength from being lowered.

  Regarding the method for manufacturing the embedded permanent magnet rotor according to the fourth embodiment, for example, a method similar to the manufacturing method described in Japanese Patent No. 3585814 can be applied as in the first embodiment, and the description thereof is omitted.

  Here, the relationship between the shape of the shielding part 85 and the strength improvement in the embedded permanent magnet rotor 105 of the fourth embodiment will be described with reference to FIG. FIG. 13B is an enlarged view of the shielding portion 85, and FIG. 13A is a cross-sectional view taken in the direction of arrow B in FIG. 13B.

First,
Shear strength of resin material: σp
Tensile strength of electrical steel sheet (laminate): σs
Shear strength of electrical steel sheet (laminate): τs
Width of shielding part 85 convex part 85c, 85d, 85e, 85f (thin part of electromagnetic steel sheet): W2
Length of shielding part 85 convex part 85c, 85d, 85e, 85f (thin part of electromagnetic steel sheet): L1
And

When the laminated plates 65a-n and 65b-n are thin by a thickness of 2t every two sheets by the shielding portions 85 convex portions 85c, 85d, 85e, and 85f, the strength S1 that decreases at the electromagnetic steel plate portion is
S1 = σs × 2t × W2
It becomes.

On the other hand, the portions of the shielding portion 85 convex portions 85c, 85d, 85e, 85f are filled with resin, and the strength S2 of the shielding portion 85 convex portions 85c, 85d, 85e, 85f is S2 = σp × 2 × L1 × W2
It becomes.

Therefore, the condition for S1 <S2 is
σs × 2t × W2 <σp × 2 × L1 × W2
∴L1> σs / σp × t
It becomes.

Further, since the strength S3 of the shielding portion 85 concave portions 85a and 85b (the convex portion 16c of the electromagnetic steel sheet) needs to be larger than the strength S2, the length of the convex portion 16c is L2.
S3 = 2 × L2 × W2 × τs> σp × 2 × L1 × W2
It becomes.

Here, since L2 = W1-2L1 (W1 is the total length of the shielding portion 85),
2 × (W1-2L1) × W2 × τs> σp × 2 × L1 × W2
∴L1 <W1 / (σp / τs + 2)
It becomes.

Therefore, if L1 is in the following range, strength improvement can be expected.
σs / σp × t <L1 <W1 / (σp / τs + 2)

For example, when σs = 400 MPa, τs = 240 MPa, σp = 90 MPa, t = 0.1 mm, W1 = 3 mm,
400/90 × 0.1 <L1 <3 / (90/240 + 2)
∴0.44mm <L1 <1.26mm
If L1 is in the above range, the strength of the laminated core is improved by an amount corresponding to the strength depending on the shape of the resin material.

  As described above, in the fourth embodiment, since the concave and convex shapes are provided in the shielding portion 85 on the bottom side of the holes 16a and 16b in the radial direction, the radial tension generated by the centrifugal force of the rotation of the rotor is provided. It can reinforce against stress and prevent strength reduction.

  Moreover, it can reinforce in the in-plane circumferential direction against compressive stress in the stacking direction, and can prevent a decrease in strength. Further, since the bonding area with the inner surface of the gap portion 16 is expanded, the laminated plates can be more firmly fixed to each other, and can be reinforced against the tensile stress in the laminating direction, thereby preventing the strength from being lowered.

  In the fourth embodiment, the concavo-convex shape is provided in the radial direction on the bottom side of the holes 16a and 16b of the shielding portion 85. However, the present invention is not limited to this.

  FIG. 14 shows a permanent magnet embedded rotor 106 having another configuration according to the fourth embodiment. FIG. 14A is an enlarged view of the embedded permanent magnet rotor 106. Fig. 14 (b) is an enlarged view of the region A in Fig. 14 (a), and Fig. 14 (c) and Fig. 14 (d) are cross-sectional views taken in the direction of the arrow B in Fig. 14 (b), C direction arrow sectional drawing is shown.

  As shown in FIG. 14, an uneven shape may be provided in the circumferential direction on the bottom side of the holes 17 a and 17 b of the shielding part 86. In the shielding part 86, shielding part concave parts 86a and 86b are formed corresponding to the convex parts 17c and 17d having the concave and convex shapes at the bottoms of the holes 17a and 17b, respectively.

  In this case, it is possible to reinforce the circumferential tensile stress generated by the rotation acceleration and centrifugal force of the rotor 106, and to prevent the strength from being lowered.

  FIG. 15 shows a permanent magnet embedded rotor 107 having another configuration of the fourth embodiment. FIG. 15A is an enlarged view of the embedded permanent magnet rotor 107. Fig. 15 (b) is an enlarged view of the region A in Fig. 15 (a), and Fig. 15 (c) and Fig. 15 (d) are cross-sectional views taken in the direction of the arrow B in Fig. 15 (b), respectively. C direction arrow sectional drawing is shown.

  As shown in FIG. 15, an uneven shape may be provided on the bottom side and the center of the holes 18 a and 18 b of the shielding part 87. Concave portions 87a and 87b are formed in the shielding portion 87 corresponding to the convex portions 18c and 18d due to the concave and convex shapes of the hole portions 18a and 18b, respectively.

  In this case, it is possible to reinforce both the circumferential tensile stress generated by the rotational acceleration of the rotor 107 and the centrifugal force and the radial tensile stress generated by the centrifugal force of the rotor rotation, thereby preventing a decrease in strength. can do.

  Further, in the permanent magnet embedded rotor according to the fourth embodiment, the resin material 80 made of a thermosetting resin is used as the resin filling the shielding portion 85, but a resin material made of a thermoplastic resin may be used.

  Also in this case, the strength of the laminated iron core is improved by an amount corresponding to the strength depending on the shape of the resin material.

Embodiment 5 FIG.
In the embedded permanent magnet rotor according to the fourth embodiment, a shielding portion is provided in the gap formed between the layers of the laminated plate forming the rotor laminated iron core, and an uneven shape is formed at the bottom of each hole forming the gap. However, in the fifth embodiment, a case in which an uneven shape is provided on the side portion of each hole portion will be described.

  FIG. 16 shows the permanent magnet embedded rotor 108 according to the fifth embodiment. FIG. 16A is an enlarged view of the embedded permanent magnet rotor 108. 16 (b) is an enlarged view of region A in FIG. 16 (a), and FIGS. 16 (c) and 16 (d) are cross-sectional views taken in the direction of arrow B in FIG. 16 (b), C direction arrow sectional drawing is shown.

  As shown in FIG. 16, in the embedded permanent magnet rotor 108 according to the fifth embodiment, the rotor laminated iron core 68 has a concavo-convex shape on the sides in the circumferential direction of the holes 15a and 15b according to the third embodiment. Are provided with holes 19a and 19b.

  68a-n (n is an integer) formed with the holes 19a and the second laminated plates 68b-1, 68b-2 formed with the holes 19b. ,..., 68b-n (n is an integer) are alternately stacked, and the openings are combined to form the gap 19. The holes 19a and 19b are formed by, for example, etching.

  A shielding portion 88 is formed in the gap portion 19 by filling and curing the resin material 80. In the shielding part 88, shielding part recesses 88a and 88b are formed corresponding to the hole protrusions 19c and 19d due to the uneven shape at the side parts of the holes 19a and 19b, respectively. Other configurations are the same as those in the first embodiment, and the same reference numerals as those in FIG.

  The shielding portion 88 reduces leakage of magnetic flux between the end portions 7 a and 7 b of the permanent magnet and prevents a decrease in strength due to the gap portion 19.

  Moreover, the shielding part 88 straddles 1st laminated board 68a-1, 68a-2, ..., 68a-n and 2nd laminated board 68b-1, 68b-2, ..., 68b-n. By forming, not only the tensile stress and the compressive stress in the stacking direction, but also the shear stress in the stacking lateral direction can be reinforced, as in the shielding part of the third embodiment, thereby preventing a decrease in strength. be able to.

  Furthermore, the shielding part 88 can reinforce against the tensile stress in the circumferential direction generated by the acceleration of rotation of the rotor 108 and the centrifugal force by providing the concave and convex shapes on the side parts in the circumferential direction of the holes 19a and 19b. Strength reduction can be prevented. In addition, since the bonding area with the inner surface of the gap portion 19 is widened, the laminated plates can be more firmly fixed, and can be reinforced against tensile stress in the laminating direction, and strength reduction can be prevented.

  Also, when the holes 19a and 19b are provided by etching, unlike the fourth embodiment, the hole protrusions 19c and 19d can be formed at the same time in a single etching process by providing an uneven shape in the etched shape. The etching process can be simplified.

  Regarding the method for manufacturing the embedded permanent magnet rotor according to the fifth embodiment, as in the first embodiment, for example, a method similar to the manufacturing method described in Japanese Patent No. 3585814 can be applied, and the description thereof is omitted.

  As described above, in the fifth embodiment, since the concave and convex shapes are provided in the shielding portion 88 on the side portions in the circumferential direction of the holes 19a and 19b, the circumferential direction generated by the rotational acceleration and centrifugal force of the rotor is provided. It is possible to reinforce against tensile stress and prevent strength reduction. In addition, since the bonding area with the inner surface of the gap portion 19 is widened, the laminated plates can be more firmly fixed, and can be reinforced against tensile stress in the laminating direction, and strength reduction can be prevented.

  In addition, when the holes 19a and 19b are provided by etching, the hole protrusions can be formed simultaneously by a single etching process simply by providing an uneven shape in the etching shape, and the etching process can be simplified.

  In the fifth embodiment, the concave and convex shapes are provided on the side portions of the shielding portion 88 in the circumferential direction, but the present invention is not limited to this.

  FIG. 17 shows a permanent magnet embedded rotor 109 having another configuration of the fifth embodiment. FIG. 17A is an enlarged view of the embedded permanent magnet rotor 109. FIG. 17 (b) is an enlarged view of the region A in FIG. 17 (a), and FIGS. 17 (c) and 17 (d) are cross-sectional views taken in the direction of arrow B in FIG. C direction arrow sectional drawing is shown.

  As shown in FIG. 17, an uneven shape may be provided on the radial side portion of the shielding portion 89. Concave portions 89a and 89b are respectively formed in the shielding portion 89 corresponding to the convex portions 20c and 20d having the concave and convex shapes on the radial side portions of the hole portions 20a and 20b.

  In this case, it is possible to reinforce against the radial tensile stress generated by the centrifugal force of the rotation of the rotor, and it is possible to prevent a decrease in strength.

  FIG. 18 shows a permanent magnet embedded rotor 110 having another configuration of the fifth embodiment. FIG. 18A is an enlarged view of the embedded permanent magnet rotor 110. 18 (b) is an enlarged view of region A in FIG. 18 (a), and FIGS. 18 (c) and 18 (d) are cross-sectional views in the direction of arrow B in FIG. 18 (b), C direction arrow sectional drawing is shown.

  As shown in FIG. 18, concave and convex shapes may be provided on both the circumferential and radial side portions of the shielding portion 90. Concave portions 90a and 90b are formed in the shielding portion 90 corresponding to the convex and concave portions 21c and 21d, respectively, on the circumferential side portions of the holes 21a and 21b, and the convex portions 21e are formed on the radial side portions. , 21f are respectively formed with recesses 90c, 90d.

  In this case, both the circumferential tensile stress generated by the rotation acceleration of the rotor and the centrifugal force and the radial tensile stress generated by the centrifugal force of the rotor rotation can be reinforced to prevent a decrease in strength. be able to.

  Moreover, the shape which provides uneven | corrugated shape in the side part of both the circumferential direction and radial direction of a shielding part is not necessarily restricted to what is shown in FIG.

  FIG. 19 shows a permanent magnet embedded rotor 111 having another configuration of the fifth embodiment. FIG. 19A is an enlarged view of the permanent magnet embedded rotor 111. 19 (b) is an enlarged view of region A in FIG. 19 (a), and FIGS. 19 (c) and 19 (d) are cross-sectional views in the direction of arrow B in FIG. 19 (b), respectively. C direction arrow sectional drawing is shown.

  A T-shaped shield 91 as shown in FIG. 19 may be used. Concave portions 91a, 91b, and 91c are formed in the shielding portion 91 corresponding to the convex and concave portions 22c, 22d, and 22e formed on the circumferential side portions of the holes 22a and 22b, respectively, and the concave and convex shapes on the radial side portions are formed. Recesses 91d and 91e are formed corresponding to the protrusions 22f and 22g, respectively.

  In this case, not only the same effects as described above can be obtained, but also a narrow region between the end portions 7a and 7b of the permanent magnet can be used effectively, reducing magnetic flux leakage and preventing strength reduction. Both effects can be improved.

  In the embedded permanent magnet rotor of the fifth embodiment, the resin material 80 made of a thermosetting resin is used as the resin filled in the shielding portion 88, but a resin material made of a thermoplastic resin may be used.

  Also in this case, the strength of the laminated iron core is improved by an amount corresponding to the strength depending on the shape of the resin material.

4 Rotating shaft 7 Permanent magnet 8a Grooves 15a, 15b, 16a, 16b, 17a, 17b, 18a, 18b, 19a, 19b, 20a, 20b, 21a, 21b, 22a, 22b Holes 16c, 16d, 17c, 17d, 18c , 18d, 19c, 19d, 20c, 20d, 21c, 21d, 21e, 21f, 22c, 22d, 22e, 22f, 22g Hole convex portions 60, 61, 62, 63, 64, 65, 66, 67, 68, 69, 70, 71 Rotor laminated cores 60a, 63a, 65a, 66a, 67a, 68a, 69a, 70a, 71a First laminated plate 60b, 61b, 63b, 65b, 66b, 67b, 68b, 69b, 70b, 71b Second laminated plate 61f Shaft hole 60, 61, 62, 63, 64, 65, 66, 67, 68, 69, 70, 71 Rotor Laminated iron core 81, 82, 83, 84, 85, 86, 87, 88, 89, 90, 91 Shield part 85c, 85d, 85e, 85f Shield part convex part 85a, 85b, 86a, 86b, 87a, 87b, 88a, 88b, 89a, 89b, 90a, 90b, 90c, 90d, 91a, 91b, 91c Shield part recess 100, 101, 102, 103, 104, 105, 106, 107, 108, 109, 110, 111 Embedded permanent magnet rotation Child

Claims (5)

A plurality of permanent magnets arranged substantially circumferentially so that adjacent magnetic poles are different from each other;
A rotating core hole is provided at the center of the rotating shaft, the plurality of permanent magnets are embedded in the vicinity of the peripheral end, and a laminated core formed by laminating magnetic plates;
A shielding portion made of a resin material disposed in the vicinity of the circumferential end portions of the adjacent permanent magnets at the edge portion of the magnetic plate;
A permanent magnet embedded rotor comprising: a rotating shaft fitted into the rotating shaft hole of the laminated core formed by laminating the magnetic plates ;
The shielding portion is formed by filling a groove or hole provided in each of the magnetic plates to be laminated with a resin material, and is provided by being shifted laterally in the stacking direction between adjacent magnetic plates or A permanent magnet embedded rotor formed in a hole. The embedded permanent magnet rotor according to claim 1, wherein the shielding portion is formed in a groove portion or a hole portion having an uneven shape on a bottom portion. The embedded permanent magnet rotor according to claim 1, wherein the shielding portion is formed in a groove portion or a hole portion having an uneven shape on a side portion. 4. The embedded permanent magnet rotor according to claim 2 , wherein the uneven shape is provided in a circumferential direction and / or a radial direction. The embedded permanent magnet rotor according to any one of claims 1 to 4, wherein a groove or a hole of the shielding part is formed by etching.

Images