JP5609330B2 - Rotating electric machine and method of manufacturing rotating electric machine - Google Patents

Description

  The present invention relates to a rotating electrical machine and a method for manufacturing the rotating electrical machine.

  Patent Document 1 relates to a structure of a permanent magnet embedded motor, and a motor structure is known in which an adhesive is applied to the entire surface of a magnet and is inserted into a magnet embedding hole in order to fix the magnet to a rotor (rotor). .

JP 2007-74899 A

  However, since the clearance (gap) between the magnet embedding hole and the magnet is small, the adhesive is scraped off when the magnet is inserted, and the adhesive does not remain on the surface of the magnet after insertion, so that the magnet cannot be firmly fixed. There was a point.

  The present invention has been made paying attention to such conventional problems, and a rotating electrical machine in which an adhesive remains on the magnet surface and / or the rotor core surface after the magnet is inserted and the magnet and the rotor core are firmly fixed. The purpose is to provide.

A rotating electrical machine according to a typical aspect of the present invention includes a rotor having a magnet embedded therein. The rotating electrical machine includes a rotor core that includes the laminated electromagnetic steel plates and constitutes the rotor, a magnet embedded hole that extends in the rotation axis direction of the rotor in the rotor core, and the magnet that is inserted into the magnet embedded hole, Is provided. The rotating electrical machine includes an adhesive applied along the insertion direction of the magnet on at least one surface of the magnet and the magnet embedding hole. Furthermore, the rotating electrical machine includes a guide member disposed on at least one side of the adhesive on the one surface. The height of the adhesive after curing is higher than the height of the guide member.

The manufacturing method which concerns on another typical aspect of this invention is used in order to manufacture the rotary electric machine which has the rotor which embed | buried the magnet inside. The manufacturing method includes a step of manufacturing a rotor core having a magnet embedded hole extending in the direction of the rotation axis of the rotor. Further, the manufacturing method includes a step of installing an adhesive and a guide member located on at least one side of the adhesive along the insertion direction of the magnet on at least one of the surface of the magnet embedding hole and the surface of the magnet. Have. Furthermore, the manufacturing method includes a step of inserting the magnet into the magnet embedding hole. The height of the adhesive after curing is higher than the height of the guide member.

  According to the present invention, the adhesive is not scraped off when the magnet is inserted. Therefore, an adhesive agent remains reliably on the magnet surface and / or rotor core surface after magnet insertion, and the magnet and the rotor core are securely fixed.

It is an end view which shows the rotary electric machine which concerns on 7th embodiment from 1st. (A) It is a perspective view which shows an example of the adhesive agent and guide member which concern on 1st embodiment. (B) It is a perspective view which shows the other example of the adhesive agent and guide member which concern on 1st embodiment. (C) It is a perspective view which shows the further another example of the adhesive agent which concerns on 1st embodiment, and a guide member. It is the partial end elevation which looked at the rotor which concerns on 1st embodiment in the rotating shaft direction. FIG. 6 is a partial cross-sectional view along the rotation axis direction showing the inside of a magnet embedding hole when it is assumed that the elastic modulus of the guide member is higher than the elastic modulus of the rotor core. When the elastic modulus of a guide member is lower than the elastic modulus of a rotor core, it is a fragmentary sectional view along the rotating shaft direction which shows the inside of a magnet embedding hole. (A) Before hardening adhesive agent, it is the partial end elevation which looked at the rotor which concerns on 2nd embodiment in the rotating shaft direction. (B) It is the partial end elevation which looked at the rotor which concerns on 2nd embodiment in the rotating shaft direction after adhesive agent hardening. It is a partial end view which shows the other rotor which concerns on 2nd embodiment before adhesive agent hardening. It is a partial sectional view along the direction of a rotation axis which shows the inside of a magnet embedding hole concerning a second embodiment. It is a figure explaining the effect which concerns on 2nd embodiment. It is the partial end elevation which looked at the rotor which concerns on 3rd embodiment in the rotating shaft direction. It is a partial end view of a rotor in case an adhesive agent and a guide member are arrange | positioned in the magnet center part. It is an expansion sheet and a guide member for transfer concerning a 4th embodiment. It is a figure which shows an example of the adhesive agent and guide member which concern on 5th embodiment. (A) It is a perspective view which shows another example of the adhesive agent and guide member which concern on 5th embodiment. (B) It is a perspective view which shows another example of the adhesive agent and guide member which concern on 5th embodiment. (C) It is a perspective view which shows another example of the adhesive agent and guide member which concern on 5th embodiment. (D) It is a perspective view which shows another example of the adhesive agent and guide member which concern on 5th embodiment. It is a figure which shows the adhesive agent and guide member which concern on 6th embodiment. It is a perspective view which shows the adhesive agent and guide member which concern on 7th embodiment. It is a perspective view which shows the other adhesive agent and guide member which concern on 7th embodiment.

  Hereinafter, embodiments for carrying out the present invention will be described in more detail with reference to the drawings.

<First embodiment>
FIG. 1 shows a rotating electrical machine 1 (motor) according to the present embodiment. The rotating electrical machine 1 includes a stator 2 (stator) and a rotor 3 (rotor) that are arranged coaxially with respect to a rotation axis. The rotor 3 is held rotatably with respect to the stator 2. The rotor core 4 of the rotor 3 is composed of a plurality of substantially identical electromagnetic steel plates stacked in the direction of the rotation axis. The electromagnetic steel sheets are produced by punching out one by one. The rotor 3 has a plurality of magnet embedding holes 6 in the rotation axis direction, and a plate-like magnet 10 is embedded in each magnet embedding hole 6.

  Referring to FIG. 2 (a), the plate-like magnet 10 includes an adhesive 12 applied along the right end 11a and the left end 11b on the surface of both end portions (right end 11a and left end 11b side), and an adhesive. 12 and guide members 14 installed on both sides. The guide member 14 is attached to the magnet 10 by an adhesive means such as an adhesive or grease. The adhesive 12 and the guide member 14 extend from the front end 11c to the rear end 11d in the direction of insertion into the magnet embedding hole 6 (rotational axis direction). Alternatively, the guide member may be disposed only on one side of the adhesive 12 as shown in FIG. That is, the magnet 10 may have only one of the guide members 14 shown in FIG.

  2C, the adhesive 12 and the guide member 14 may be provided on the surface of the magnet embedding hole 6 (that is, the surface of the rotor core 4) at a position facing both ends of the magnet 10. Good. Also in this case, the guide member 14 is attached to at least one side of the adhesive 12. The adhesive 12 and the guide member 14 extend in the direction in which the magnet embedding hole 6 extends. In the present embodiment, the direction in which the magnet embedding hole 6 extends is the same as the rotation axis direction of the rotor 3 and the direction in which the magnet 10 is inserted.

  FIG. 3 is a partial end view of the rotor 3 and shows a state where the magnet 10 is inserted into the magnet embedding hole 6. The guide member 14 prevents the adhesive 12 from being scraped off at the entrance or inner wall of the magnet embedding hole 6 when the magnet 10 is inserted. As shown in FIG. 3, the adhesive 12 reliably remains on the magnet surface even after the magnet 10 is inserted, and the magnet 10 and the rotor core 4 can be strongly bonded after curing. The adhesive 12 and the guide member 14 are attached to the surface on the side where the magnet 10 moves by centrifugal force when the rotor 3 rotates, that is, the surface on the side away from the rotor rotation axis of the magnet 10.

  In addition, the elasticity modulus of the material of the guide member 14 is smaller than the elasticity modulus of the rotor core 4 (magnetic steel plate). For example, the material of the guide member 14 is resin.

  FIG. 4 shows a rotor cross-sectional view (rotational axis direction) showing the inside of the magnet embedding hole when it is assumed that the elastic modulus of the guide member 14 is higher than the elastic modulus of the rotor core 4. Since the rotor core 4 is composed of laminated electromagnetic steel plates 4a, the inner wall of the magnet embedding hole 6 has irregularities due to misalignment of the laminated steel plates. When it is assumed that the elastic modulus of the guide member 14 is higher than the elastic modulus of the rotor core 4, the convex portion 16 of the electromagnetic steel plate 4 a that protrudes most in the magnet embedding hole 6 contacts the guide member 14. Therefore, when the rotor 3 rotates at high speed, the centrifugal force load of the magnet 10 is concentrated only on the convex portion 16 of one electromagnetic steel plate 4a via the guide member 14, and the rotor core 4 is broken at the convex portion 16 due to stress concentration. .

  On the other hand, as shown in FIG. 5, when the elastic modulus of the guide member 14 is lower than the elastic modulus of the rotor core 4, the guide member 14 is elastically deformed by the centrifugal force load of the magnet 10 when the rotor 3 rotates at high speed. The distance from the rotor core 4 is reduced. Therefore, the rotor core 4 contacts the guide member 14 at the second and third convex portions 17 and 18 in addition to the most projecting convex portion 16 (first convex portion). Therefore, the centrifugal force applied to the rotor core 4 from the magnet 10 is dispersed, and it is possible to prevent the total load from being concentrated only on one convex portion 16 of the rotor core 4.

  Next, the manufacturing method which manufactures the rotary electric machine 1 which has the rotor 3 which embedded the magnet 10 inside is demonstrated.

  The manufacturing method includes a step of manufacturing the rotor core 4 having the magnet embedded holes 6 extending in the rotation axis direction of the rotor 3 by laminating the electromagnetic steel plates 4a. The manufacturing method also includes a step of installing the adhesive 12 and the guide member 14 along the magnet insertion direction on at least one of the surface of the magnet embedding hole 6 and the surface of the magnet 10. The guide member 14 is located on at least one side of the adhesive 12. In addition, the manufacturing method includes a step of inserting the magnet 10 into the magnet embedding hole 6 of the rotor core 4. Furthermore, the manufacturing method includes a step of arranging the rotor 3 coaxially with the stator 2. In this manufacturing method, the adhesive 12 is not removed when the magnet is inserted. Therefore, the rotating electrical machine in which the adhesive 12 reliably remains on the surface of the magnet 10 and / or the surface of the magnet embedding hole 6 and the magnet 10 is securely fixed to the rotor core 4 can be provided.

-Action and effect-
As described above, the rotating electrical machine 1 includes the adhesive 12 applied along the insertion direction of the magnet 10 on at least one of the surface of the magnet 10 and the surface (wall surface) of the magnet embedding hole 6. Further, the rotating electrical machine 1 includes a guide member 14 disposed on at least one side of the adhesive 12 on at least one surface thereof. Due to the configuration of the rotating electrical machine, the adhesive 12 is not scraped off when the magnet is inserted. Accordingly, the adhesive remains reliably on the magnet surface and / or the rotor core surface (the surface of the magnet embedding hole 6) after the magnet is inserted, and the magnet 10 and the rotor core 4 can be securely fixed.

  The rotating electrical machine 1 includes an adhesive 12 on at least one of the surface of the magnet embedding hole 6 on the side far from the rotation axis and the surface of the magnet 10 on the side far from the rotation axis. Thus, the rotating electrical machine 1 has the adhesive 12 and the guide member 14 on the side where the magnet 10 moves due to centrifugal force when the rotor 3 rotates. Therefore, the adhesive 12 and / or the guide member 14 function as a cushion against a centrifugal load applied from the magnet 10 to the rotor core 4, and damage to the rotor core 4 can be prevented.

  Since the elastic modulus of the guide member 14 is smaller than that of the rotor core 4, the guide member 14 is elastically deformed by the centrifugal force load of the magnet 10, and the rotor core 4 comes into contact with the guide member 14 at a plurality of locations. Therefore, the centrifugal force applied to the rotor core 4 from the magnet 10 is dispersed, and the rotor core 4 can be prevented from being damaged.

<Second embodiment>
In 2nd embodiment, as shown to Fig.6 (a), the magnet 10 has the guide member 14 on the both sides or the one side (at least one side) of the adhesive agent 12 apply | coated to the surface. Further, the linear expansion coefficient of the adhesive 12 is larger than the linear expansion coefficient of the guide member 14. The adhesive 12 is made of a material (such as a thermosetting adhesive such as an epoxy resin) that undergoes irreversible thermal expansion by thermosetting or the like. Other configurations are the same as those in the first embodiment.

  By providing the guide member 14 on one side or both sides of the adhesive 12, the adhesive 12 is not scraped off when the magnet 10 is inserted, but reliably remains on the surface of the magnet after insertion. At this time, as shown in FIG. 6A, if the gap 24 is generated between the guide member 14 and the rotor core 4 due to misalignment or the like, the adhesive 12 does not reach the rotor core 4, so that the magnet 10 and the rotor core 4 are fixed as they are. Can not. However, the linear expansion coefficient of the adhesive 12 is larger than the linear expansion coefficient of the guide member 14 and becomes equal to or higher than the height of the gap 24 after thermosetting. For this reason, as shown in FIG. 6B, the adhesive 12 reaches the rotor core 4 after thermosetting, and the magnet 10 and the rotor core 4 can be reliably bonded.

  As shown in FIG. 7, the adhesive 12 is applied below the height of the guide member 14, and the adhesive 12 can reach the rotor core 4 by the expansion due to thermosetting. This is because the linear expansion coefficient of the adhesive 12 is larger than the linear expansion coefficient of the guide member 14. Thereby, the application | coating thickness of the adhesive agent 12 can be decreased. Moreover, since the adhesive 12 does not adhere to unnecessary portions when the magnet is inserted, the quality of the product is improved. Furthermore, no extra work such as wiping off the adhesive 12 occurs, and the manufacturing cost of the rotor 3 is reduced.

  As shown in FIG. 8, the adhesive 12 protected by the guide member 14 and remaining on the magnet surface expands at the time of thermosetting, fills the space between the rotor core 4 and the magnet 10, and forms an adhesive layer 26. As a result, since the guide member 14 and the adhesive 12 are surely present between the magnet 10 and the rotor core 4, the centrifugal force load of the magnet 10 is transmitted to the rotor core 4 through the guide member 14 and the adhesive layer 26. As a result, as shown in FIG. 9, the magnet 10 and the rotor core 4 are connected in series and parallel by two types of elastic bodies (springs) including the guide member 14 and the adhesive 12. Therefore, the stress concentration due to the stacking unevenness of the rotor core 4 can be alleviated by the laminated magnetic steel sheets as a whole, and the rotor 3 can operate up to a higher rotation.

  As described above, according to the present embodiment, the linear expansion coefficient of the adhesive 12 is larger than the linear expansion coefficient of the guide member 14. For example, the adhesive 12 is made of a material that undergoes irreversible thermal expansion. For this reason, the magnet 10 and the rotor core 4 can be reliably bonded. When the adhesive 12 forms the adhesive layer 26, the rotor core 4 contacts the adhesive 12 at a plurality of locations. Therefore, the centrifugal load applied from the magnet 10 to the rotor core 4 is reliably dispersed.

<Third embodiment>
In the third embodiment, as shown in FIG. 10, the adhesive 12 and the guide member 14 are located on the surfaces of both ends of the magnet (on the right end 11 a and the left end 11 b side). Further, at least one of the guide members 14 is positioned on the center side of the magnetic pole 10 with respect to the adhesive 12. Other configurations are the same as those in the first embodiment.

  When the rotor 3 rotates at a high speed, the portion 30 of the rotor core 4 located on the radially outer side of the magnet embedding hole 6 receives a force radially outward due to the centrifugal load of the magnet 10. The portion 30 is a region sandwiched between two bridge portions 32 positioned at the radially outer corners of the magnet embedding hole 6. As shown in FIG. 11, if the adhesive 12 and the guide member 14 are located on the surface of the magnet central portion and in contact with the rotor core 4, the total centrifugal force load of the magnet 10 is placed in the center of the magnet embedding hole 6. It joins the part of the rotor core 4 which opposes. Therefore, a large bending moment is generated in the bridge portion 32 of the rotor core 4 and the rotor core 4 is broken.

  On the other hand, in the present embodiment, as shown in FIG. 10, the rotor core 4 receives a centrifugal force load at a position facing both ends of the magnet, so that the load is distributed in half. And the distance of the action point 33 of the magnet load in the rotor core 4 and the bridge part 32 becomes small. For this reason, the bending moment in the bridge part 32 becomes small, and the fracture | rupture of the rotor core 4 can be prevented.

  Moreover, in this embodiment, since the rotor core 4 receives a centrifugal force load at a position facing both ends of the magnet, the adhesive 12 is prevented from flowing into the magnet center. Therefore, as shown in FIG. 10, the guide member 14 for protecting the adhesive 12 is installed on the magnet center side with respect to the adhesive 12. Moreover, since the guide member 14 should just be provided only in the one side of the adhesive agent 12, the number of the guide members 14 used per magnet does not increase, and cost is suppressed.

<Fourth embodiment>
In the fourth embodiment, as shown in FIG. 12, an expansion sheet 40 (for example, a fired sheet) that thermally expands irreversibly is used as the adhesive 12. As shown in FIG. 12, the expansion sheet 40 provided with the guide members 14 at both ends is prepared in advance, and the expansion sheet 40 and the guide member 14 are transferred onto the surface of the magnet 10 together. For example, the expansion sheet 40 and the guide member 14 can be provided on a sheet-like base material or the like. The expansion sheet 40 and the guide member 14 can also be connected due to the adhesiveness of the expansion sheet 40. Other configurations are the same as those in the first embodiment.

  As described above, according to the present embodiment, the adhesive application operation can be simplified and the cost can be reduced by transferring the guide member 14 and the adhesive together in advance to the magnet surface at a time.

<Fifth embodiment>
In the fifth embodiment, the adhesive 12 and the guide member 14 have various forms different from the first embodiment. Other configurations are the same as those in the first embodiment.

  As shown in FIG. 13, the guide member 14 has a ladder shape. The adhesive 12 is surrounded by the guide member 14. Thereby, when inserting the magnet 10 in the magnet embedding hole 6, the dripping of the adhesive agent 12 can be prevented.

  In addition, as shown in FIGS. 14A to 14D, the adhesive 12 and the guide member 14 may have various forms. As shown in FIG. 14A, the adhesive 12 and the guide members 14 on both sides thereof may be disposed at the four corners of the plate-like magnet 10 with a length shorter than that of the right end 11 a and the left end 11 b of the magnet 10. . As shown in FIG. 14B, the quadrangular adhesive 12 and the square ring-shaped guide member 14 disposed so as to surround the adhesive 12 may be disposed on the surface of the magnet 10. As shown in FIG. 14C, the thinner adhesive 12 and the guide members 14 on both sides thereof may be disposed near both ends of the magnet 10. As shown in FIG. 14 (d), the thinner adhesive 12 and the guide members 14 on both sides thereof may be arranged at the center of the surface of the magnet 10.

<Sixth embodiment>
In the sixth embodiment, as shown in FIG. 15, the guide member 14 is made of a cured adhesive 60. The adhesive 12 (second adhesive) is applied between the previously cured adhesive 60 (first adhesive). The adhesive 60 may be the same type as the adhesive 12 or a different type. Other configurations are the same as those in the first embodiment.

  In addition to the same effects as the first embodiment, this embodiment has an effect that the guide member 14 can be easily formed.

<Seventh embodiment>
In the seventh embodiment, as shown in FIGS. 16 and 17, the coating 70 that is normally provided on the magnet 10 is provided with irregularities, and the concave 72 is used as an adhesive reservoir. The adhesive 12 is applied to the recess 72. The coating material is, for example, an epoxy resin. The coating 70 may be partially removed and a recess 72 may be provided. Other configurations are the same as those in the first embodiment. In FIG. 16, the adhesive 12 and the guide member 14 (coating 70) extend from the front end 11c to the rear end 11d in the direction of insertion into the magnet embedding hole 6 (rotational axis direction). In FIG. 17, the adhesive 12 and the recess 72 do not reach the front end 11c and the rear end 11d, but are present in a state surrounded by the guide member 14 (coating 70).

  As described above, according to the present embodiment, the adhesive 12 is disposed in the recess 72 provided in the coating 70 of the magnet 10, and the coating 70 becomes the guide member 14. Therefore, the manufacturing cost of the rotating electrical machine can be reduced.

  Without being limited to the embodiments described above, various modifications and changes are possible within the scope of the technical idea, and it is obvious that these are also included in the technical scope of the present invention.

DESCRIPTION OF SYMBOLS 1 Rotating electrical machine 2 Stator 3 Rotor 4 Rotor core 4a Magnetic steel plate 6 Magnet embedding hole 10 Magnet 12 Adhesive 14 Guide member

Claims (11)

A rotating electric machine having a rotor with a magnet embedded therein,
A rotor core comprising laminated electromagnetic steel sheets and constituting the rotor;
In the rotor core, a magnet embedding hole extending in the rotation axis direction of the rotor,
The magnet inserted into the magnet embedding hole;
On the surface of at least one of the surface of the magnet and the surface of the magnet embedding hole, an adhesive applied along the insertion direction of the magnet,
A guide member disposed on at least one side of the adhesive on the one surface ;
The rotating electrical machine, wherein the height of the adhesive after curing is higher than the height of the guide member . A rotating electric machine having a rotor with a magnet embedded therein,
A rotor core comprising laminated electromagnetic steel sheets and constituting the rotor;
In the rotor core, a magnet embedding hole extending in the rotation axis direction of the rotor,
The magnet inserted into the magnet embedding hole;
On the surface of at least one of the surface of the magnet and the surface of the magnet embedding hole, an adhesive applied along the insertion direction of the magnet,
A guide member disposed on at least one side of the adhesive on the one surface;
The rotating electrical machine according to claim 1, wherein the guide member has a ladder shape, and the adhesive is surrounded by the guide member. A rotating electric machine having a rotor with a magnet embedded therein,
A rotor core comprising laminated electromagnetic steel sheets and constituting the rotor;
In the rotor core, a magnet embedding hole extending in the rotation axis direction of the rotor,
The magnet inserted into the magnet embedding hole;
On the surface of at least one of the surface of the magnet and the surface of the magnet embedding hole, an adhesive applied along the insertion direction of the magnet,
A guide member disposed on at least one side of the adhesive on the one surface;
  The rotating electrical machine, wherein the guide member is made of a cured adhesive. 4. The adhesive according to claim 1, wherein the adhesive is provided on at least one of a surface of the magnet embedding hole far from the rotation axis and a surface of the magnet far from the rotation axis. 5. The rotating electrical machine described in 1. 5. The rotating electrical machine according to claim 1, wherein an elastic modulus of the guide member is smaller than an elastic modulus of the rotor core. 6. The rotating electrical machine according to claim 1, wherein a linear expansion coefficient of the adhesive is larger than a linear expansion coefficient of the guide member. The rotating electrical machine according to any one of claims 1 to 6, wherein the adhesive and the guide member are installed at both ends of the magnet. The rotating electrical machine according to any one of claims 1 to 7, wherein the guide member is installed at least on a center side of the magnet. The rotating electrical machine according to any one of claims 1 to 8, wherein the adhesive is an expansion sheet that thermally expands irreversibly. The rotating electrical machine according to claim 1 or 2 , wherein the adhesive is disposed in a recess provided in the coating of the magnet, and the coating serves as the guide member. A manufacturing method for manufacturing a rotating electrical machine having a rotor with a magnet embedded therein,
Producing a rotor core having a magnet buried hole extending in the direction of the rotation axis of the rotor;
Installing a guide member located on at least one side of the adhesive and the adhesive along the insertion direction of the magnet on at least one of the surface of the magnet embedding hole and the surface of the magnet;
Inserting the magnet into the magnet embedding hole,
The manufacturing method, wherein the height of the adhesive after curing is higher than the height of the guide member .

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