JP2010154587A - Permanent magnet embedded rotor, magnetic plate, and method of manufacturing the permanent magnet embedded rotor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a permanent magnet embedded rotor with stable quality, which is free from the deficiency or break of permanent magnets upon insertion of permanent magnets, and also in which the permanent magnets are always fixed surely in certain positions for embedding permanent magnets and the quantity of unbalance in rotation of the rotor is reduced. <P>SOLUTION: The permanent magnet embedded rotor includes: a rotor stacked core 11, in which a plurality of magnetic plates 11a where holes 12a for embedding magnets are created at equal intervals in its circumferential direction are stacked; and permanent magnets 13, which are installed in each hole 12a for embedding the magnets. In the rotor, a thin part 15a, which is thinner than the magnetic plate 11a, is formed at the side of the hole 12a for embedding the magnets of the magnetic plate 11a, and the permanent magnet 13 is fixed to the rotor stacked core 11 by the elastic transformation of the thin part 15a. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a permanent magnet embedded rotor, and more particularly, to a permanent magnet embedded rotor in which a permanent magnet is mounted in a magnet embedding hole of a rotor laminated iron core in which a plurality of magnetic plates are stacked in the axial direction. It is related to.

As shown in a plan view (a) and a side view (b) of FIG. 19, the conventional general permanent magnet embedded rotor includes a rotating shaft 100 and a thin plate in which the rotating shaft 100 is fitted at the center. A rotor core 101 formed by laminating steel plates and a permanent magnet 103 embedded in a magnet embedding hole 102 formed near the outer periphery of the rotor core 101 are provided.
The permanent magnet 103 is formed in a size that can be accommodated in the magnet embedding hole 102. When embedding the permanent magnet 103 in the magnet embedding hole 102, an adhesive is applied to the surface of the permanent magnet 103, and the permanent magnet 103 is adhered and fixed to the magnet embedding hole 102 by the adhesive. When an adhesive cannot be used for fixing the permanent magnet 103, the permanent magnet 103 is molded so as to be embedded in the magnet embedding hole 102 without a gap. When the permanent magnet 103 is embedded in the magnet embedding hole 102, the permanent magnet 103 is pressed by a pneumatic device or the like and forcibly pressed into the magnet embedding hole 102.

  In addition, for example, Patent Document 1 proposes a permanent magnet embedded rotor in which a permanent magnet is fixed by a magnet fixing member. In this permanent magnet embedded rotor, after the permanent magnet is inserted into the permanent magnet insertion hole of the iron core, one surface of the magnet fixing member is pressed against both end faces of the rotor core, and the press-fitted portion of the magnet fixing member is inserted into the magnetic flux leakage prevention hole. Press fit into. At the same time, the circumferential pressing part of the magnet fixing member is inserted between the permanent magnet and the inner surface of the insertion hole, and the permanent magnet is pressed against the pressing part in the insertion hole. Fixed inside.

  Further, in the permanent magnet embedded rotor disclosed in Patent Document 2, the permanent magnet is fixedly held in the magnet embedding hole by shifting at least one of the magnetic plates constituting the iron core in the circumferential direction. Yes.

Japanese Patent Laid-Open No. 9-308149 Japanese Patent Laid-Open No. 9-182333

  In a permanent magnet embedded rotor in which a conventional permanent magnet is attached to a magnet embedding hole via an adhesive, the permanent magnet is formed slightly smaller than the permanent magnet embedding hole. There was a problem that the internal fixed position was not fixed and the amount of unbalance during rotation of the rotor increased. Further, when embedding the permanent magnet in the hole for embedding the magnet, there has been a problem that the thickness of the adhesive layer cannot be stably secured because the applied adhesive is scraped off.

  In the conventional permanent magnet embedded rotor in which the permanent magnet is forcibly pressed into the hole for embedding the magnet without using an adhesive, for example, when the permanent magnet is a sintered body and is brittle, the permanent magnet is pressed. Sometimes the permanent magnet is easily chipped due to contact with the wall surface of the magnet embedding hole. In addition, there is a problem that it is necessary to improve the dimensional accuracy of the permanent magnet in order to obtain dimensional consistency between the permanent magnet and the magnet embedding hole.

  In the permanent magnet embedded rotor shown in Patent Document 1, it is necessary to separately prepare a magnet fixing plate integrally molded with a mold resin in a ring shape having an outer diameter slightly smaller than the outer diameter of the rotor core, and the product cost is reduced. There is a problem of getting higher. Further, it is necessary to press-fit the press-fitting portion of the magnet fixing member into the magnetic flux leakage prevention hole, which causes a problem in workability. Further, since the permanent magnet is not fixed in the radial direction, there is a problem that it is actually necessary to use it together with an adhesive.

  Moreover, in the permanent magnet embedded rotor shown in Patent Document 2, it is necessary to shift and fix a part of the magnetic plate of the iron core in the circumferential direction after the permanent magnet is inserted into the magnet embedding hole. In addition, there is a problem that productivity is deteriorated.

  The present invention has been made in order to solve the above-described problems, and provides a permanent magnet embedded rotor having a quality that does not cause a permanent magnet to be lost or damaged when the permanent magnet is inserted. Further, it is possible to provide a permanent magnet embedded rotor in which the permanent magnet is always securely fixed at a fixed position in the magnet embedding hole, and the amount of unbalance during rotation of the rotor is reduced.

  In addition, a permanent magnet embedded type rotor that is securely fixed at a fixed position of a magnet embedding hole without causing any permanent magnet breakage or damage when the permanent magnet is inserted is inexpensive, easy, and suitable for automation. The purpose is to manufacture with.

A permanent magnet embedded rotor according to the present invention is attached to a rotor laminated iron core in which a plurality of magnetic plates having magnet embedding holes formed at equal intervals in the circumferential direction are laminated in the axial direction, and each magnet embedding hole. In a permanent magnet embedded rotor having a permanent magnet,
A thin portion having a thickness smaller than the thickness of the magnetic plate is formed near the side surface of the magnet embedding hole of the magnetic plate, and the permanent magnet is fixed to the rotor laminated core by elastic deformation of the thin portion. To do.

The method of manufacturing a magnetic plate according to the present invention is a method of manufacturing a magnetic plate in which holes for embedding magnets are formed at equal intervals in the circumferential direction.
A magnet embedding hole of the magnetic plate is formed by etching, and a thin portion having a thickness smaller than the thickness of the magnetic plate is formed near the side surface of the magnet embedding hole by half etching.

The method of manufacturing a permanent magnet embedded rotor according to the present invention includes a rotor laminated iron core in which a plurality of magnetic plates in which magnet embedding holes are formed at equal intervals in the circumferential direction are laminated in the axial direction, and each magnet embedding hole In the manufacturing method of a permanent magnet embedded rotor having a permanent magnet attached to
Forming a hole for embedding the magnet in the magnetic plate by etching, and forming a thin portion with a thickness smaller than the thickness of the magnetic plate in the vicinity of the side surface of the hole for embedding magnet by half-etching;
A step of forming a rotor laminated core by laminating a plurality of magnetic plates formed with magnet embedding holes in the axial direction;
A step of inserting the permanent magnet into the magnet embedding hole and fixing the permanent magnet to the rotor laminated core by elastic deformation of the thin portion;

  According to the permanent magnet embedded rotor of the present invention, a thin portion having a thickness smaller than the thickness of the magnetic plate is formed near the side surface of the magnet embedding hole of the magnetic plate, and the permanent magnet is formed by elastic deformation of the thin portion. Is fixed to the rotor laminated iron core, it is possible to provide a stable rotor of a quality that does not cause the permanent magnet to be lost or damaged when the permanent magnet is inserted. Further, since the permanent magnet is always securely fixed at a fixed position in the magnet embedding hole, the amount of unbalance when the rotor rotates can be reduced.

  According to the method of manufacturing a magnetic plate and a permanent magnet embedded rotor according to the present invention, the permanent magnet is securely fixed to a fixed position of the magnet embedding hole without causing the permanent magnet to be broken or damaged when the permanent magnet is inserted. The magnet-embedded rotor can be manufactured by an inexpensive and easy method and a method suitable for automation.

Embodiment 1 FIG.
FIG. 1 is a view for explaining a magnetic plate constituting a rotor laminated core of a permanent magnet embedded rotor according to Embodiment 1 of the present invention. FIG. 2 is a plan view and a side sectional view showing a rotor laminated core of the embedded permanent magnet rotor according to the present embodiment, and FIG. 3 is a permanent magnet embedded in which a permanent magnet and a rotating shaft are attached to the rotor laminated core of FIG. It is the top view and side surface sectional view which show a type | mold rotor. 4 is a sectional view in the axial direction of a permanent magnet type motor equipped with the embedded permanent magnet rotor of this embodiment, and FIG. 5 is a sectional view of the stator and rotor of the permanent magnet type motor in FIG. 4 perpendicular to the axial direction. Sectional drawing at the time of cutting by is shown.

  2 shows the rotor laminated core of the embedded permanent magnet rotor of this embodiment, and FIG. 3 shows the permanent magnet embedded rotor in which the permanent magnet and the rotating shaft are mounted on the rotor laminated core of FIG. Yes. In addition, although the permanent magnet embedded type rotor of this embodiment has illustrated the case of 8 poles, other pole numbers may be used. 2 and 3, the embedded permanent magnet rotor 10 includes a rotor laminated core 11 made of a laminate in which a plurality of magnetic plates 11a such as silicon steel plates processed into a predetermined shape are laminated, and a rotor laminated iron core. The permanent magnet 13 corresponding to the number of poles embedded in the magnet embedding hole 12 formed in the vicinity of the outer periphery of the magnet 11 (8 poles in this example) and the rotation fitted in the central portion of the rotor laminated core 11 A shaft 14 is provided.

  The rotor laminated iron core 11 is provided with magnet embedding holes 12 at equal intervals in the circumferential direction by the number of poles of the rotor (eight in this example) in the vicinity of the outer periphery thereof. The magnet embedding hole 12 has two side surfaces (in this example, two side surfaces in the long side direction) that extend in the circumferential direction and face each other, and two side surfaces that extend in the radial direction and face each other (in this example) In this case, it is a substantially rectangular hole having two side surfaces in the short side direction, and penetrates the magnetic body 11a constituting the rotor laminated core 11 in the axial direction. In each magnet embedding hole 12, a permanent magnet 13 is mounted so that the magnetic pole surface is in the radial direction and the poles adjacent in the circumferential direction are different from each other. Here, the permanent magnet 13 can be composed of a neodymium rare earth magnet.

  4 and 5 are cross-sectional views showing a permanent magnet motor equipped with the embedded permanent magnet rotor of the present embodiment. 4 and 5, the stator 20 includes a stator laminated iron core 21 in which a predetermined number of magnetic plates such as silicon steel plates are laminated in the axial direction, and a winding 22 applied to the teeth 21 a of the stator laminated iron core 21. (The winding 22 is omitted in FIG. 5) and is configured to be connected to the power supply unit by a lead wire (not shown). The stator 20 is fixed by an outer structure 23. The permanent magnet embedded rotor 10 is shown in FIG. 3, and includes a rotor laminated core 11 made of a laminate in which a plurality of magnetic plates are laminated, and a permanent magnet 13 embedded in a magnet embedding hole 12. The rotating shaft 14 is provided. The permanent magnet embedded rotor 10 is rotatably attached to the outer structure 23 via a bearing 24. Note that the number of slot openings of the stator 20 and the number of magnetic poles of the permanent magnet embedded rotor 10 are appropriately determined in consideration of the characteristics of the rotating electrical machine.

  FIG. 1 is a plan view, a partially enlarged view, and a cross-sectional view showing a magnetic plate 11a constituting a rotor laminated iron core 11 of a permanent magnet embedded rotor 10 according to the present embodiment. As shown in FIG. 1, in the magnetic plate 11a constituting the rotor laminated core 11, magnets are embedded at equal intervals in the circumferential direction by the number of poles of the rotor (8 in this example) in the vicinity of the outer periphery. A hole 12a is provided. A thin portion 15a thinner than the thickness of the magnetic plate 11a is formed on the side surface on the radially inner side of the side surfaces extending in the circumferential direction of the magnet embedding hole 12a. Further, thin portions 15b thinner than the thickness of the magnetic plate 11a are formed on two side surfaces that extend in the radial direction of the magnet embedding hole 12a and face each other. Then, when the magnetic plates 11a as shown in FIG. 1 are laminated in the required axial direction, the rotor laminated iron core 11 shown in FIG. 2 is formed. FIG. 2B is a diagram showing a cross section 3A-3A of the plan view of FIG. 2A, but in order to make the diagram easy to understand, the thickness of the magnetic plate 11a is enlarged to be larger than the actual scale. (In a normal scale, the thickness of the magnetic plate 11a is smaller and the number is larger). Similarly, the shape of the thin portion 15a of the magnet embedding hole is also enlarged and shown (both the thickness and protrusion length of the thin portion 15a are smaller on a normal scale).

  The permanent magnet 13 is inserted into the magnet embedding hole 12 of the rotor laminated core 11 of FIG. 2 obtained as described above, and the rotating shaft 14 is press-fitted into the central portion of the rotor laminated core 11 to obtain FIG. The rotor 10 for embedding the permanent magnet according to the first embodiment shown is obtained.

Here, the relationship between the radial thickness t of the permanent magnet and the radial widths w1 and w2 of the magnet embedding hole 12a shown in FIG.
w1 <t <w2 (1)
Therefore, when the permanent magnet is inserted, the thin portion 15a of the magnet embedding hole 12a contacts the permanent magnet 13, and the permanent magnet 13 is inserted while the thin portion 15a is deformed. Therefore, after the permanent magnet is inserted, the permanent magnet 13 is fixed in the magnet embedding hole by elastic deformation of the thin portion 15a.

  When a permanent magnet is inserted into a magnet embedding hole in which the radial width of the magnet embedding hole is smaller than the radial thickness of the permanent magnet and the thin portion is not formed, the permanent magnet is There is a problem that the permanent magnet is damaged or broken due to the resistance when the magnet is inserted. However, in the case of the present embodiment, since the thin portion is formed in the hole for embedding the magnet, the rigidity of the thin portion becomes low, the resistance when the permanent magnet is inserted is reduced, and the permanent magnet is lost or damaged. It is possible to reliably fix the permanent magnet to the rotor laminated core without using a method such as adhesion.

Further, as shown in FIGS. 1D and 1E, the thin portion 15b is formed on the two side surfaces extending in the radial direction of the magnet embedding hole 12a and facing each other, and the circumferential width of the permanent magnet The relationship between L and the circumferential lengths L1 and L2 of the magnet embedding hole 12a shown in FIG.
L1 <L <L2 (2)
Is set to When the permanent magnet is inserted, the thin portions 15b on both side surfaces extending in the radial direction of the magnet embedding hole 12a come into contact with the circumferential end of the permanent magnet 13, and the permanent magnet 13 is inserted while the thin portion 15b is elastically deformed. The After the permanent magnet is inserted, the permanent magnet 13 is fixed to the magnet embedding hole 12a by elastic deformation of the thin portion 15b. Therefore, the permanent magnet 13 can be reliably fixed to the circumferential direction of the rotor laminated core 11 without using a method such as adhesion and without being broken or damaged.

As described above, since the thin wall portion 15a is formed on the radially inner side surface of the side surfaces extending in the circumferential direction of the magnet embedding hole 12a, the permanent magnet 13 is disposed on the radially outer side of the magnet embedding hole 12. It is fixed in a state of being pressed against the side surface and in contact therewith. Therefore, the magnetic flux flows from the magnetic pole surface of the permanent magnet 13 through the magnetic plate 11a toward the outside in the radial direction without passing through the gap, and there is an effect of increasing the magnetic efficiency.
Further, in the circumferential direction, the permanent magnets 13 are fixed to the center position in the circumferential direction of the magnet embedding hole 12 by making the protruding lengths of the thin portions 15b on both sides of the magnet embedding hole 12a equal. Therefore, the position of the permanent magnet 13 in the rotor laminated core 11 does not vary and is fixed at a fixed position. In the case of the present embodiment, all of the eight permanent magnets 13 are pressed against the outer peripheral side surface of the magnet embedding hole 12 and fixed to the center position in the circumferential direction of the magnet embedding hole 13 without variation. Therefore, the amount of rotor unbalance can be reduced.

  Here, the formation method of the thin part of the hole for magnet embedding is demonstrated. The magnetic plate 11a of the present embodiment is formed by etching a steel plate 30 such as a silicon steel plate. First, FIG. 6 shows a conceptual diagram of a method for forming a through hole by etching. Masking (resist) 40 is applied to both surfaces of the steel plate 30 except for the portions where the through holes are formed. And the through-hole 31 is formed by spraying etching liquid on the steel plate 30 by which the masking process was carried out, and dissolving the steel plate 30 of the part which is not masked.

  Next, the conceptual diagram of the method of forming the thin part arrange | positioned in the hole for magnet embedding in FIG. 7 by an etching process is shown. As shown in FIG. 7, masking 40 is applied only to one side of the portion where the thin portion is formed. By spraying an etching solution on the steel plate 30 thus masked and dissolving the unmasked portion of the steel plate 30, a bottomed hole is formed in the steel plate 30, and as a result, a thin portion 32 is formed. Will be. This etching method is called half etching.

  8 and 9 are plan views showing an example of masking for forming the magnetic plate of the rotor laminated core according to the first embodiment. FIG. 8 shows a masking 40A arranged on one side of the steel plate 30, and FIG. 9 shows a masking 40B arranged on the other side of the steel plate 30. The masking 40A in FIG. 8 has an opening 41 for forming the outer peripheral portion of the magnetic plate 11a, an opening 42a for forming the magnet embedding hole 12a, and an opening 43 for inserting the rotating shaft. is doing. The masking 40B in FIG. 9 has an opening 41 for forming the outer periphery of the magnetic plate 11a, an opening 42b for forming the magnet embedding hole 12a, and an opening 43 for inserting the rotation shaft. is doing. Since the radial width of the opening 42b of the masking 40B in FIG. 9 is shorter than the radial width of the opening 42a of the masking 40A in FIG. 8, the magnet embedding hole 12a of the magnetic plate 11a shown in FIG. The thin-walled portion 15a can be formed. Moreover, the thin part 15b of the magnet embedding hole 12a of the magnetic plate 11a shown in FIG. 1 can be formed by the radially inner protrusions at both ends in the circumferential direction of the opening 42b of the masking 40B of FIG.

  By adjusting the processing conditions (processing time, etc.) at the time of half-etching, the thickness of the thin portion can be adjusted as shown in FIGS. 10B and 10C, and the rigidity of the thin portion can be adjusted. Can be adjusted. As a result, the magnitude of the resistance when the permanent magnet 13 is inserted into the magnet embedding hole 12a and the magnitude of the force that holds the permanent magnet 13 in the magnet embedding hole 12a can be adjusted. Further, by adjusting the length of the thin portion as shown in FIG. 10A, the rigidity of the thin portion can be adjusted, and the magnitude of resistance when the permanent magnet 13 is inserted and the permanent magnet 13 are held. The magnitude of the force can be adjusted. In order to fix the permanent magnet 13 more securely, a method such as adhesion may be used in an auxiliary manner.

  As described above, according to the first embodiment, a thin portion thinner than the thickness of the magnetic plate is formed in the vicinity of the side surface of the magnet embedding hole of the magnetic plate, and the permanent magnet is formed by elastic deformation of the thin portion. Since it is fixed to the rotor laminated iron core, it is possible to provide a stable rotor with a quality that does not cause the permanent magnet to be lost or damaged when the permanent magnet is inserted. Further, since the permanent magnet is always securely fixed at a fixed position in the magnet embedding hole, the amount of unbalance when the rotor rotates can be reduced.

  In addition, a hole for embedding the magnet in the magnetic plate is formed by etching, and a thin portion having a thickness smaller than the thickness of the magnetic plate is formed near the side surface of the hole for embedding the magnet by half-etching. To manufacture a permanent magnet embedded type rotor that is securely fixed at a fixed position of a magnet embedding hole without causing permanent magnet breakage and breakage, by an inexpensive and easy method and a method suitable for automation. Can do.

Embodiment 2. FIG.
11 is a plan view and a side sectional view showing a rotor laminated core of a permanent magnet embedded rotor according to a second embodiment of the present invention. FIG. 12 is a perspective view of the rotor laminated core shown in FIG. It is the top view and side sectional view showing a permanent magnet embedded type rotor.

  In the second embodiment, as shown in FIGS. 11 and 12, the rotor laminated core 11 is formed by combining the magnetic plate 11 a-1 with the thin portion 15 a and the magnetic plate 11 a-2 with no thin portion 15 a formed. Configure. In this case, as shown in FIGS. 11 and 12, the magnetic plates 11a-1 having the thin portions 15a are stacked and stacked between the magnetic plates 11a-2 having the plurality of thin portions 15a not formed. Alternatively, the magnetic plates 11a-1 on which the thin portions 15a are formed and the magnetic plates 11a-2 on which the thin portions 15a are not formed may be alternately stacked. Although not shown in the drawings, as described in the first embodiment, the magnetic plate has thin portions 15b formed on two side surfaces that extend in the radial direction of the magnet embedding hole and face each other. In this case, the rotor laminated core may be configured by combining a magnetic plate in which the thin portion 15b is formed and a magnetic plate in which the thin portion 15b is not formed. Here, the method of forming the magnetic plate and the thin portion uses etching and half-etching as in the first embodiment. The method for fixing the permanent magnet to the rotor laminated iron core is the same as in the first embodiment.

  In the second embodiment, the rotor laminated iron core 11 is configured by combining the magnetic plate 11a-1 in which the thin portion 15a is formed and the magnetic plate 11a-2 in which the thin portion 15a is not formed. Further, the resistance when the permanent magnet 13 is inserted into the magnet embedding hole 12 is reduced, and the risk of the permanent magnet 13 being lost or damaged is further reduced.

  As described above, according to the present embodiment, the rigidity of the thin portion can be reduced, so that the permanent magnet can be inserted into the hole for embedding the magnet with a smaller resistance, and the permanent magnet is prevented from being broken or damaged. However, the permanent magnet can be reliably fixed to the rotor laminated core. Further, since the permanent magnet can be accurately and reliably fixed at a fixed position in the rotor laminated iron core, the amount of unbalance when the rotor rotates can be reduced.

Embodiment 3 FIG.
13 is a plan view and a side sectional view showing a rotor laminated core of an embedded permanent magnet rotor according to Embodiment 3 of the present invention. FIG. 14 is a perspective view of the rotor laminated core shown in FIG. It is the top view and side sectional view showing a permanent magnet embedded type rotor.

  In the third embodiment, as shown in FIGS. 13 and 14, the magnetic plate 11a-3 includes a magnetic plate 11a- on the radially inner side surface among the side surfaces extending in the circumferential direction of the magnet embedding hole 12a. Thin portions 15c thinner than the plate thickness 3 are formed at a plurality of locations. And the rotor laminated | stacked iron core 11 is comprised by laminating | stacking and laminating | stacking the magnetic plate 11a-3 in which the thin part 15c was formed, and the magnetic plate 11a-4 in which the thin part 15c was not formed. Alternatively, the rotor laminated core 11 may be configured by laminating only a plurality of magnetic plates 11a-3 on which the thin portions 15c are formed. Although not shown, as described in the first embodiment, the magnetic plate has thin portions 15b formed on the two side surfaces that extend in the radial direction of the magnet embedding hole and face each other. Here, the method of forming the magnetic plate and the thin portion uses etching and half-etching as in the first embodiment. The method for fixing the permanent magnet to the rotor laminated core is the same as that in the first embodiment.

  As described above, according to the present embodiment, the rigidity of the thin-walled portion can be further reduced, so that the permanent magnet can be inserted into the permanent magnet embedding hole with smaller resistance, and the permanent magnet is lost or damaged. The permanent magnet can be reliably fixed to the rotor laminated iron core while preventing the above. In addition, since the permanent magnet can be fixed accurately and reliably at a predetermined position in the rotor laminated core, the amount of unbalance when the rotor rotates can be reduced.

Embodiment 4 FIG.
15 is a sectional view and a detailed view showing a magnetic plate constituting a rotor laminated core of a permanent magnet embedded rotor according to a fourth embodiment of the present invention, and FIG. 16 is a plan view showing the rotor laminated iron core according to the present embodiment. FIG. 17 is a plan view, a sectional view, and a detailed view showing a permanent magnet embedded rotor in which a permanent magnet and a rotating shaft are mounted on the rotor laminated core shown in FIG.

  In the said embodiment, the thin parts 15a, 15b, 15c have the shape which protruded from the side surface of the hole 12a for magnet embedding of the magnetic board 11a. On the other hand, in the present embodiment, the thin portion is formed at a position inside the magnetic body from the side surface of the magnet embedding hole. For example, as shown in FIGS. 15 and 16, the thin portion 16a is spaced a little from the radially inner side surface to the position inside the magnetic body among the side surfaces extending in the circumferential direction of the magnet embedding hole of the magnetic plate 11b. Is formed. The thin portion 16a is disposed along a side surface extending in the circumferential direction of the magnet embedding hole. Further, as shown in the detailed view of FIG. 16C, slits 17a extending in the radial direction from both circumferential ends of the thin portion 16a toward the magnet embedding hole 12a are formed. Further, as described in the first embodiment, the magnetic plate 11b is formed with the thin portions 15b on the two side surfaces extending in the radial direction of the magnet embedding hole and facing each other. Here, the method of forming the magnetic plate and the thin portion uses etching and half-etching as in the first embodiment.

  FIG. 16 shows a rotor laminated core 11 obtained by laminating a required number of magnetic plates 11b. The permanent magnet embedded rotor 10 is obtained by inserting the permanent magnet 13 into the magnet embedding hole 12 of the rotor laminated core 11 and press-fitting the rotating shaft 14. When the permanent magnet 13 is inserted into the rotor laminated iron core 11, the thin portion 16a of the magnetic plate 11b is elastically deformed as shown in the detailed view of FIG. It can be fixed to the iron core 11. As described in the above embodiment, the rotor laminated core 11 can be configured by combining and laminating a magnetic plate in which the thin portion 15b is formed and a magnetic plate in which the thin portion 15b is not formed. .

  By configuring as described above, the rigidity of the thin portion can be reduced, so that the permanent magnet can be inserted into the permanent magnet embedding hole with a smaller resistance, and the permanent magnet can be prevented from being broken or damaged. However, the permanent magnet can be reliably fixed to the rotor laminated core. Further, since the permanent magnet can be accurately and reliably fixed at a fixed position in the rotor laminated iron core, the amount of unbalance when the rotor rotates can be reduced.

  FIG. 18 is a plan view, a detailed view, and a cross-sectional view showing a configuration of a magnetic plate that is a modification of the fourth embodiment. The magnetic plate 11c in FIG. 18 is formed by interposing a plurality of thin portions 16b at positions inside the magnetic body from the radially inner side surface among the side surfaces extending in the circumferential direction of the magnet embedding hole 12a. Then, slits 17b extending in the radial direction from both end portions of each thin portion 16b toward the magnet embedding hole 12a are formed.

  By configuring as described above, the rigidity of the thin-walled portion can be further reduced, so that the permanent magnet can be inserted into the hole for embedding the magnet with a smaller resistance while preventing the permanent magnet from being broken or damaged. The permanent magnet can be reliably fixed to the rotor laminated core. Further, since the permanent magnet can be accurately and reliably fixed at a predetermined position in the rotor laminated core, the amount of unbalance when the rotor rotates can be reduced.

It is the top view of the magnetic board which comprises the rotor lamination | stacking iron core of the permanent magnet embedded type rotor which concerns on Embodiment 1 of this invention, the elements on larger scale, and sectional drawing. FIG. 3 is a plan view and a side cross-sectional view showing a rotor laminated core of the embedded permanent magnet rotor according to the first embodiment. FIG. 3 is a plan view and a side sectional view showing a permanent magnet embedded rotor in which a permanent magnet and a rotating shaft are mounted on the rotor laminated iron core of FIG. 2. FIG. 3 is an axial sectional view of a permanent magnet motor equipped with the embedded permanent magnet rotor according to the first embodiment. FIG. 5 is a cross-sectional view when the stator and the rotor of the permanent magnet type motor of FIG. 4 are cut along a cross section perpendicular to the axial direction. The conceptual diagram of the formation method of the through-hole by an etching is shown. The conceptual diagram of the method of forming a thin part by an etching process is shown. FIG. 3 is a plan view showing an example of masking for forming the magnetic plate of the rotor laminated iron core according to the first embodiment. FIG. 3 is a plan view showing an example of masking for forming the magnetic plate of the rotor laminated iron core according to the first embodiment. It is a figure which shows formation of the thin part by half etching. It is the top view and side sectional drawing which show the rotor lamination | stacking iron core of the permanent magnet embedding type rotor by Embodiment 2 of this invention. FIG. 12 is a plan view and a side sectional view showing a permanent magnet embedded rotor in which a permanent magnet and a rotating shaft are mounted on the rotor laminated iron core of FIG. 11. It is the top view and side sectional drawing which show the rotor lamination | stacking iron core of the permanent magnet embedding type rotor by Embodiment 3 of this invention. FIG. 14 is a plan view and a side sectional view showing a permanent magnet embedded rotor in which a permanent magnet and a rotating shaft are mounted on the rotor laminated iron core of FIG. 13. It is sectional drawing and detail drawing which show the magnetic board which comprises the rotor lamination | stacking iron core of the permanent magnet embedding type rotor by Embodiment 4 of this invention. FIG. 6 is a plan view, a cross-sectional view, and a detailed view showing a rotor laminated core according to a fourth embodiment. FIG. 17 is a plan view, a cross-sectional view, and a detailed view showing a permanent magnet embedded rotor in which a permanent magnet and a rotating shaft are mounted on the rotor laminated iron core of FIG. 16. FIG. 10 is a plan view, a detailed view, and a cross-sectional view illustrating a configuration of a magnetic plate that is a modification of the fourth embodiment. It is the top view and side view which show the conventional common permanent magnet embedded type | mold rotor.

Explanation of symbols

10 embedded permanent magnet rotor, 11 rotor laminated core, 11a magnetic plate,
12, 12a Magnet embedding hole, 13 permanent magnet, 14 rotating shaft,
15a, b, c, 16a Thin part.

Claims (11)

Permanent magnet embedded type comprising a rotor laminated iron core in which a plurality of magnetic plates having magnet embedding holes formed at equal intervals in the circumferential direction are laminated in the axial direction, and permanent magnets mounted in the respective magnet embedding holes. In the rotor,
A thin portion having a thickness smaller than the thickness of the magnetic plate is formed near the side surface of the magnet embedding hole of the magnetic plate, and the permanent magnet is fixed to the rotor laminated core by elastic deformation of the thin portion. A permanent magnet embedded rotor. 2. The permanent magnet embedded rotor according to claim 1, wherein the thin portion is formed in the vicinity of a radially inner side surface in a vicinity of a side surface extending in a circumferential direction of the magnet embedding hole. 3. The permanent magnet embedded rotor according to claim 1, wherein the thin portion is formed in the vicinity of two side surfaces that extend in a radial direction of the magnet embedding hole and face each other. . 4. The rotor laminated iron core according to claim 1, wherein the laminated magnetic core is formed by combining a magnetic plate in which the thin portion is formed and a magnetic plate in which the thin portion is not formed. A permanent magnet embedded rotor according to claim 1. The permanent magnet-embedded rotor according to any one of claims 1 to 4, wherein the thin-walled portion has a shape protruding from a side surface of a magnet-embedding hole of the magnetic plate. 5. The permanent magnet embedding according to claim 1, wherein the thin portion is formed at a position inside the magnetic body from a side surface of the magnet embedding hole of the magnetic plate. Type rotor. The thin-walled portion is formed in a plurality of locations near the side surface on the radially inner side in the vicinity of the side surface extending in the circumferential direction of the magnet embedding hole. The embedded permanent magnet rotor according to any one of the above. The distance between the thin wall portion protruding from the side surface of the magnet embedding hole of the magnetic plate and the side surface facing the side surface is smaller than the corresponding outer dimension of the permanent magnet, and the protruding thin wall portion is The embedded permanent magnet rotor according to claim 5, wherein a distance between the formed side surface and the side surface facing the side surface is formed to be larger than a corresponding outer dimension of the permanent magnet. The distance between the side surface where the thin portion is formed at the position inside the magnetic body of the magnet embedding hole of the magnetic plate and the side surface facing the side surface is smaller than the corresponding outer dimension of the permanent magnet. The embedded permanent magnet rotor according to claim 6. In the method of manufacturing a magnetic plate in which holes for embedding magnets are formed at equal intervals in the circumferential direction,
Manufacturing a magnetic plate, wherein a hole for embedding a magnet in the magnetic plate is formed by etching, and a thin portion having a thickness smaller than a thickness of the magnetic plate is formed near a side surface of the hole for embedding the magnet by half-etching. Method. Permanent magnet embedded type comprising a rotor laminated iron core in which a plurality of magnetic plates having magnet embedding holes formed at equal intervals in the circumferential direction are laminated in the axial direction, and permanent magnets mounted in the respective magnet embedding holes. In the rotor manufacturing method,
Forming a hole for embedding the magnet in the magnetic plate by etching, and forming a thin portion having a thickness smaller than the thickness of the magnetic plate in the vicinity of the side surface of the hole for embedding the magnet by half-etching;
A step of forming a rotor laminated core by laminating a plurality of magnetic plates in which the magnet embedding holes are formed in the axial direction;
A method of manufacturing a permanent magnet embedded rotor comprising a step of inserting the permanent magnet into the magnet embedding hole and fixing the permanent magnet to the rotor laminated core by elastic deformation of the thin portion.

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