JP2023169641A - Permanent magnet motor, rotor and rotor core for the same, and manufacturing method and manufacturing device for the permanent magnet motor - Google Patents

Abstract

To provide a rotor core capable of more securely bonding permanent magnets arranged to form a plurality of rows on a shaft direction, a permanent magnet motor and its rotor using the same, and a manufacturing method for a permanent magnet motor and a manufacturing device for the permanent magnet motor.SOLUTION: A permanent magnet motor includes a stator and a rotor. The rotor includes a plurality of permanent magnets 10p, 10q, and a rotor core 30. The rotor core 30 is provided rotatably around a rotary shaft for the permanent magnet motor. In the rotor core 30, a plurality of bonding surfaces 32p, 32q is arranged to form a plurality of rows that circles the sides in a circumferential direction and is adjacent to each other in a shaft direction. In each of the plurality of bonding surfaces 32p, 32q, permanent magnets 10p, 10q are bonded by bonding agents 20p, 20q. In the rotor core 30, between one set of bonding surfaces 32p, 32q adjacent to each other in the shaft direction among the plurality of bonding surfaces 32p, 32q, a bonding agent reservoir groove 30a is provided whose circumferential direction is set to a longitudinal direction.SELECTED DRAWING: Figure 4

Description

The present disclosure relates to a permanent magnet motor, a rotor and rotor core of a permanent magnet motor, and a method and apparatus for manufacturing a rotor of a permanent magnet motor.

Patent Document 1 discloses an example of a permanent magnet motor. In a permanent magnet motor, a groove is formed in an electromagnetic steel plate constituting a rotor core, into which a permanent magnet is inserted in a shape that matches the shape of the permanent magnet. Glue is applied between the permanent magnet and the bottom of the groove. An adhesive storage recess is formed at the upper end of the side wall of the groove, into which adhesive flowing out from between the permanent magnet and the bottom surface of the groove is introduced through the gap between the side wall of the groove and the side wall of the permanent magnet. By visually checking the amount of adhesive stored in the recess, the state of application of the adhesive can be confirmed.

Japanese Patent Application Publication No. 2012-125076

In the rotor of a permanent magnet motor, permanent magnets are sometimes arranged in a plurality of rows in the axial direction. At this time, one of the permanent magnets in the rotor is adjacent to another permanent magnet in the axial direction. Here, in the rotor of the permanent magnet motor of Patent Document 1, the side walls of the grooves to which the permanent magnets are attached are provided on the circumferential side. Therefore, when attaching the permanent magnet, the adhesive may protrude in the axial direction. The adhesive that protrudes toward the axial side of the permanent magnet may hinder the attachment of other permanent magnets adjacent to the permanent magnet in the axial direction. At this time, the adhesive strength of the permanent magnet may decrease due to the adhesive extruding.

The present disclosure relates to solving such problems. The present disclosure provides a rotor core capable of more reliably bonding permanent magnets arranged in a plurality of rows in the axial direction, a permanent magnet motor using the rotor core, a rotor thereof, and a method and apparatus for manufacturing the permanent magnet motor. do.

The rotor core of the permanent magnet motor according to the present disclosure is a rotor core that is rotatably provided around the rotation axis of the permanent magnet motor, and a permanent magnet is adhered to each rotor core, and a plurality of rotor cores that go around the side surface in the circumferential direction and are adjacent in the axial direction A plurality of adhesive surfaces arranged in a row are provided, and an adhesive storage groove having a circumferential direction as a longitudinal direction is provided between a pair of axially adjacent adhesive surfaces among the plurality of adhesive surfaces. provided.

A rotor of a permanent magnet motor according to the present disclosure includes the above rotor core and a plurality of permanent magnets bonded to each of the plurality of bonding surfaces of the rotor core.

A permanent magnet motor according to the present disclosure includes the rotor described above, and a stator that is arranged coaxially with the rotor and in which coils around which stator windings are wound are arranged side by side in the circumferential direction.

A method for manufacturing a rotor of a permanent magnet motor according to the present disclosure includes a first adhesive surface that is any one of the plurality of adhesive surfaces provided on the rotor core, or a first adhesive surface that is bonded to the first adhesive surface. a first application step of applying an adhesive to one or both of the bottom surfaces of the first permanent magnet; and after the first application step, pressing the bottom surface of the first permanent magnet against the first adhesive surface from the radial direction; A first pressing step.

A permanent magnet motor rotor manufacturing apparatus according to the present disclosure includes a first permanent magnet that is bonded to a first bonding surface that is any one of the plurality of bonding surfaces provided on the rotor core. a gripping part that grips from the opposite side of the bottom surface; and the first permanent magnet that is gripped by the gripping part with an adhesive applied to one or both of the bottom surface and the first adhesive surface of the first permanent magnet. a pressing portion that presses the bottom surface of the adhesive surface against the first adhesive surface from the radial direction.

According to the permanent magnet motor, the rotor or rotor core of the permanent magnet motor, or the manufacturing method or manufacturing device of the permanent magnet motor according to the present disclosure, permanent magnets arranged in a plurality of rows in the axial direction are bonded more reliably. become able to.

1 is a sectional view of a permanent magnet motor according to Embodiment 1. FIG. FIG. 2 is a perspective view of permanent magnets of the permanent magnet motor according to Embodiment 1. FIG. FIG. 2 is a perspective view of the rotor of the permanent magnet motor according to the first embodiment. 4 is a sectional view taken along line AA in FIG. 3 of the rotor of the permanent magnet motor according to Embodiment 1. FIG. 1 is a front view of the manufacturing apparatus according to Embodiment 1. FIG. 6 is a sectional view taken along line BB in FIG. 5 of the manufacturing apparatus according to the first embodiment. FIG. FIG. 6 is a sectional view taken along line CC in FIG. 5 of the manufacturing apparatus according to the first embodiment. FIG. 6 is a diagram showing an example of attaching permanent magnets to a rotor of a comparative example with respect to Embodiment 1; FIG. 6 is a diagram showing an example of attaching permanent magnets to a rotor of a comparative example with respect to Embodiment 1; FIG. 6 is a diagram showing an example of attaching permanent magnets to a rotor of a comparative example with respect to Embodiment 1; FIG. 3 is a diagram showing an example of attaching permanent magnets to the rotor according to the first embodiment. FIG. 3 is a diagram showing an example of attaching permanent magnets to the rotor according to the first embodiment.

DESCRIPTION OF THE PREFERRED EMBODIMENTS Modes for implementing the subject matter of the present disclosure will be described with reference to the accompanying drawings. In each figure, the same or corresponding parts are given the same reference numerals, and overlapping explanations are simplified or omitted as appropriate. Note that the subject of the present disclosure is not limited to the following embodiments, and modifications of any constituent elements of the embodiments or modifications of any constituent elements of the embodiments may be made without departing from the spirit of the present disclosure. Can be omitted.

Embodiment 1.
FIG. 1 is a sectional view of a permanent magnet motor 1 according to the first embodiment.
In FIG. 1, a sectional view taken along a plane perpendicular to the rotation axis of the permanent magnet motor 1 is shown. In FIG. 1, the direction perpendicular to the paper surface is the axial direction.

The permanent magnet motor 1 includes a stator 2 and a rotor 3. Stator 2 and rotor 3 are arranged coaxially. In this example, the rotor 3 is arranged inside the stator 2. In the stator 2, a plurality of magnetic pole teeth 4 are arranged side by side in the circumferential direction. In the stator 2, a stator winding 5 is wound around each magnetic pole tooth 4. The stator winding 5 forms a coil that generates a magnetic field when energized. The stator 2 generates a rotating magnetic field inside by a plurality of coils arranged in the circumferential direction. The rotor 3 includes a rotor core 30 and a plurality of permanent magnets 10.

The rotor core 30 is rotatably provided around the rotation axis of the permanent magnet motor 1. The rotor core 30 is formed of, for example, a cast metal, a processed iron material, an electromagnetic steel plate, or the like. On the side surface of the rotor core 30, a plurality of magnet attachment grooves 31 are provided between the plurality of salient poles. The magnet attachment groove 31 is a groove to which the permanent magnet 10 is attached.

Each permanent magnet 10 is attached to the rotor core 30 so that its bottom surface 10a faces the bottom surface of the magnet attachment groove 31. The bottom surface of the magnet attachment groove 31 includes an adhesive surface 32 . In this example, each permanent magnet 10 corresponds to one adhesive surface 32. Each permanent magnet 10 is attached to a corresponding adhesive surface 32. Each permanent magnet 10 is attached to the rotor core 30 with an adhesive. Here, the adhesive is applied to one or both of the adhesive surface 32 included in the bottom surface 10a of the permanent magnet 10 or the bottom surface of the magnet attachment groove 31. In this example, the adhesive is applied to the bottom surface 10a of the permanent magnet 10. Each permanent magnet 10 is magnetized before being attached to the rotor core 30. Each permanent magnet 10 is, for example, a neodymium magnet.

FIG. 2 is a perspective view of the permanent magnet 10 of the permanent magnet motor 1 according to the first embodiment.

In this example, each permanent magnet 10 has a dome shape that is elongated in one direction. The bottom surface 10a of the permanent magnet 10 is a flat surface parallel to the longitudinal direction. The permanent magnet 10 has a curved surface 10b on the opposite side of the bottom surface 10a.

In FIG. 2, right-handed XYZ orthogonal coordinates with the center of gravity O of the permanent magnet 10 as the origin are shown. Here, the axis pointing in the longitudinal direction of the permanent magnet 10 is referred to as the Z axis. Further, the axis perpendicular to the bottom surface 10a of the permanent magnet 10 is defined as the X axis. Further, the axis perpendicular to both the Z axis and the X axis is the Y axis. The Y-axis points in the lateral direction when the permanent magnet 10 is viewed from a direction perpendicular to the bottom surface 10a.

FIG. 3 is a perspective view of the rotor 3 of the permanent magnet motor 1 according to the first embodiment.

The permanent magnets 10 are arranged in a row circumferentially around the side surface of the rotor core 30. The permanent magnets 10 are arranged in a plurality of axially adjacent rows. Therefore, on the side surface of the rotor core 30, the adhesive surfaces 32 to which the permanent magnets 10 correspond are arranged in a row that goes around the circumferential direction. Further, the adhesive surfaces 32 are arranged in a plurality of rows adjacent to each other in the axial direction. In this example, the permanent magnets 10 are arranged in two axially adjacent rows. Correspondingly, the adhesive surfaces 32 are arranged in two axially adjacent rows.

A lower positioning tool 40p and an upper positioning tool 40q are attached to the rotor core 30. The lower positioning tool 40p and the upper positioning tool 40q are parts used for positioning the permanent magnet 10 in the axial direction. The lower positioning tool 40p and the upper positioning tool 40q are made of non-magnetic material. The lower positioning tool 40p is attached to one end of the rotor core 30 in the axial direction. Upper positioning tool 40q is attached to the other end of rotor core 30 in the axial direction.

FIG. 4 is a sectional view taken along line AA in FIG. 3 of the rotor 3 of the permanent magnet motor 1 according to the first embodiment.

In FIG. 4, axially adjacent permanent magnets 10p and 10q are shown. In addition, when the permanent magnet 10p, the permanent magnet 10q, etc. are not particularly distinguished, they may be simply written as the permanent magnet 10. Permanent magnet 10p corresponds to adhesive surface 32p of rotor core 30. Permanent magnet 10q corresponds to adhesive surface 32q of rotor core 30. The adhesive surface 32p and the adhesive surface 32q are included in the bottom surface of the magnet attachment groove 31 of the rotor core 30. Note that when the adhesive surface 32p, the adhesive surface 32q, etc. are not particularly distinguished, they may be simply referred to as the adhesive surface 32. The permanent magnet 10p is attached to the adhesive surface 32p with an adhesive 20p. Permanent magnet 10q is attached to adhesive surface 32q with adhesive 20q. Note that when the adhesive 20p, the adhesive 20q, etc. are not particularly distinguished, they may be simply referred to as the adhesive 20. The permanent magnet 10 is attached to the rotor core 30 by applying the adhesive 20 to a corresponding adhesive surface 32 with the adhesive 20 applied to the bottom surface 10a. At this time, the adhesive 20 is spread between the bottom surface 10a and the adhesive surface 32. An excess amount of the spread adhesive 20 protrudes outward from the axial end of the permanent magnet 10.

In the rotor core 30, an adhesive storage groove 30a is provided between the axially adjacent adhesive surfaces 32p and 32q. The adhesive storage groove 30a is provided so that the circumferential direction is the longitudinal direction. In this example, the adhesive storage groove 30a is provided over the entire circumference of the rotor core 30. The adhesive storage groove 30a is a groove in which the adhesive 20 protruding from the axial end of the permanent magnet 10 is stored when the permanent magnet 10 is adhered to the adhesive surface 32. Note that the adhesive storage groove 30a is not limited to being provided over the entire circumference of the rotor core 30, but may be provided only between axially adjacent permanent magnets 10 depending on the workability or processing cost of the rotor core 30. It may be.

In FIG. 4, the length in the axial direction of the region to which the permanent magnet 10 is attached is represented by a dimension α. Moreover, the distance between the permanent magnets 10 adjacent in the axial direction is represented by the dimension β. Further, the width of the adhesive storage groove 30a in the axial direction is represented by the dimension γ.

Considering the characteristics of the permanent magnet motor 1, it is preferable to use a single permanent magnet 10 in the axial direction. However, if the length of the permanent magnet 10 becomes long, there may be problems in manufacturing the permanent magnet 10, such as yield problems, problems in rigidity, etc. may occur. For this reason, the permanent magnet 10 is divided into a plurality of parts in the axial direction and is attached to the rotor core 30. On the other hand, since it is preferable to use a single permanent magnet 10 in the axial direction, it is preferable that the dimension β, which is the interval between the permanent magnets 10, is small. In this example, the dimension β is set to about 2 mm, for example, based on the dimensional accuracy of the permanent magnet 10 itself, the attachment accuracy of the permanent magnet 10, and the like.

If the dimension γ, which is the width in the axial direction of the adhesive storage groove 30a, is longer than the dimension β, there will be a difference in the thickness of the adhesive layer on the bottom surface 10a of the permanent magnet 10, which will affect the adhesive strength and the stress on the permanent magnet 10. The impact is visible. Furthermore, if the dimension γ is too shorter than the dimension β, it becomes difficult for the adhesive 20 protruding from the axial end of the permanent magnet 10 to flow into the adhesive storage groove 30a. For this reason, it is necessary to consider the viscosity of the adhesive 20 used, the flow rate at the time of extrusion, etc., and determine the dimension γ based on experiments conducted in advance. The dimension γ is set, for example, to the same width as the dimension β. Further, the depth of the adhesive storage groove 30a is determined so that the adhesive 20 that protrudes when the permanent magnet 10 is attached first does not overflow from the adhesive storage groove 30a. The depth of the adhesive storage groove 30a is determined based on, for example, experiments conducted in advance.

The lower positioning tool 40p and the upper positioning tool 40q are attached to the ends of the rotor core 30 so as to protrude from the adhesive surface 32 in the radial direction. The lower positioning tool 40p and the upper positioning tool 40q have a regulating portion 41. The regulating portion 41 is a portion that comes into contact with an end portion of the permanent magnet 10 in the axial direction to regulate the movement of the permanent magnet 10. The regulating portion 41 faces the adhesive surface 32 without contacting it. The regulating portion 41 of the lower positioning tool 40p faces the adhesive surface 32p without contacting it. The regulating portion 41 of the lower positioning tool 40p is provided so as to be able to regulate movement by contacting the end of the permanent magnet 10p from the outside in the axial direction. The regulating portion 41 of the upper positioning tool 40q faces the adhesive surface 32q without contacting it. The regulating portion 41 of the upper positioning tool 40q is provided so as to be able to regulate movement by contacting the end of the permanent magnet 10q from the outside in the axial direction.

The lower positioning tool 40p and the upper positioning tool 40q regulate the attachment length of the plurality of permanent magnets 10 arranged in the axial direction. The attachment length of the plurality of permanent magnets 10 lined up in the axial direction is the length from one end to the other end in the axial direction of the plurality of permanent magnets 10 lined up as a whole. In this example, the lower positioning tool 40p and the upper positioning tool 40q regulate the attachment lengths of the permanent magnets 10p and 10q. The attachment length of permanent magnet 10p and permanent magnet 10q is the length from the axially outer end of permanent magnet 10p to the axially outer end of permanent magnet 10q.

For example, if a magnetized permanent magnet 10p is attached and then a magnetized permanent magnet 10q is attached before the adhesive 20p has hardened, the magnetic repulsion between the permanent magnets 10 causes both of them to separate from each other. The permanent magnet 10 may be misaligned. In addition, if the magnetized permanent magnet 10p is pasted and the magnetized permanent magnet 10q is pasted after the adhesive 20p has sufficiently hardened, the magnetized permanent magnet 10p fixed with the adhesive 20p will be in position. Stays in place. On the other hand, the magnetized permanent magnet 10q attached later may be displaced away from the permanent magnet 10p due to magnetic repulsion between the permanent magnets 10. In order to suppress the occurrence of such positional deviation, the lower positioning tool 40p and the upper positioning tool 40q position the permanent magnet 10 by contacting the end of the permanent magnet 10 in the axial direction to restrict movement. .

In this example, if the method is to attach a magnetized permanent magnet 10p and then attach a magnetized permanent magnet 10q after the adhesive 20p has sufficiently hardened, the lower positioning tool 40p on the permanent magnet 10p side is Can be omitted. On the other hand, as a repair when a mistake occurs in pasting the permanent magnet 10, there is a possibility that one or both of the permanent magnet 10p and the permanent magnet 10q must be re- pasted. To cope with such a case, a lower positioning tool 40p and an upper positioning tool 40q are provided on both sides of the rotor core 30 in the axial direction. Note that the lower positioning tool 40p and the upper positioning tool 40q are attached to the end of the rotor core 30 before the permanent magnet 10 is attached. The lower positioning tool 40p and the upper positioning tool 40q are removed from the rotor core 30 after the permanent magnet 10 is attached and the adhesive 20 used for the last attached permanent magnet 10 is sufficiently cured.

In manufacturing the rotor 3, the permanent magnets 10 are attached to the rotor core 30 using a manufacturing device not shown in FIG.

Next, the configuration of the manufacturing apparatus will be explained using FIGS. 5 to 7.
FIG. 5 is a front view of the manufacturing apparatus according to the first embodiment.
FIG. 6 is a sectional view taken along line BB in FIG. 5 of the manufacturing apparatus according to the first embodiment.
FIG. 7 is a sectional view taken along the line CC in FIG. 5 of the manufacturing apparatus according to the first embodiment.

The manufacturing apparatus includes a magnet attachment head section 100. In FIG. 5, a front view of the magnet attachment head section 100 is shown. The magnet attaching head section 100 is a section equipped with a function of attaching the magnetized permanent magnet 10 to the rotor core 30. FIG. 5 shows the magnet attachment head section 100 viewed from the bottom surface 10a side of the permanent magnet 10 when attached to the rotor core 30. 5 to 7, the XYZ coordinate system of the permanent magnet 10 is shown.

As shown in FIG. 5, the magnet sticking head section 100 includes a gripping block 11. As shown in FIG. The gripping block 11 is a portion that grips the permanent magnet 10. The gripping block 11 grips the permanent magnet 10 so that the bottom surface 10a faces the front. That is, the gripping block 11 grips the curved surface 10b side of the permanent magnet 10. The gripping block 11 grips the permanent magnet 10 with magnetic attraction. That is, the gripping block 11 grips the curved surface 10b of the permanent magnet 10 using the magnetic force of the permanent magnet 10. Adhesive 20 is applied to the bottom surface 10a of the permanent magnet 10 with the gripping block 11 facing forward.

The magnet sticking head section 100 includes a magnet chuck 14. The magnetic chuck 14 is made of, for example, a magnetic material. The magnetic chuck 14 is used to center the permanent magnet 10 so that the center line of the grip block 11 is located on the X axis of the permanent magnet 10, that is, the center line of the grip block 11 passes through the center of gravity of the permanent magnet 10. provided. The magnetic chucks 14 are arranged on both sides of the permanent magnet 10 in the Y-axis direction, that is, on both the left and right sides of the permanent magnet 10 in this example. The magnetic chuck 14 is opened and closed by a magnetic chuck actuator 15. The speed at which the magnetic chuck actuator 15 closes the left and right magnetic chucks 14 is set to the same speed so that the center line of the gripping block 11 is located on the X axis of the permanent magnet 10. Further, if an impact is applied to the permanent magnet 10, cracks or chips may occur. Therefore, the speed at which the magnetic chuck actuator 15 closes the left and right magnetic chucks 14 and the magnitude of the force with which the left and right magnetic chucks 14 sandwich the permanent magnet 10 are adjusted to such an extent that cracks or chips do not occur in the permanent magnet 10. be done.

As shown in FIG. 6, the magnet attachment head section 100 includes a positioning block 18. The positioning block 18 serves as a reference for positioning the permanent magnet 10. The positioning block 18 is driven by a positioning block actuator 19. The positioning block actuator 19 moves the positioning block 18 in the front and rear directions, for example. The positioning block 18 contacts one end of the Z axis of the permanent magnet 10. In this example, positioning block 18 contacts the lower end of permanent magnet 10. Positioning block 18 is made of non-magnetic material. The shape of the positioning block 18 is, for example, a prismatic shape.

The magnet attachment head section 100 includes a Z-axis pusher 16. The Z-axis pusher 16 is arranged at the opposite end of the positioning block 18 with respect to the Z-axis of the permanent magnet 10. In this example, the Z-axis pusher 16 is arranged above the permanent magnet 10. The Z-axis pusher 16 is driven by a Z-axis pusher actuator 17. The Z-axis pusher actuator 17 moves the Z-axis pusher 16 in the vertical direction. The Z-axis pusher actuator 17 positions the permanent magnet 10 in the Z-axis direction by pressing the Z-axis pusher 16 against the upper end of the permanent magnet 10 until the lower end of the permanent magnet 10 hits the positioning block 18.

In FIG. 7, the gripping block 11 is shown gripping the permanent magnet 10. The gripping block 11 has a curved surface 11b on the front side. The shape of the curved surface 11b of the gripping block 11 is a concave shape that follows the convex shape of the curved surface 10b of the permanent magnet 10. The width of the gripping block 11 in the left-right direction is the same as the width of the permanent magnet 10 in the Y-axis direction. The length of the gripping block 11 in the vertical direction is equal to or longer than the length of the permanent magnet 10 in the Z-axis direction. Grip block 11 is made of magnetic material. The gripping block 11 has a volume that is above the saturation magnetization region, that is, the magnetic flux density is below the saturation magnetic flux density of the magnetic material. The grip block 11 is an example of a grip part.

In the gripping block 11, a square hole 11a is provided. The square hole 11a is a through hole that penetrates the grip block 11 in the X-axis direction of the permanent magnet 10. The length of the square hole 11a in the Z-axis direction is designed to correspond to the lengths of various permanent magnets 10.

The extrusion block 12 is inserted into the square hole 11a of the gripping block 11. Extrusion block 12 is made of magnetic material. The shape of the extruded block 12 is, for example, a prismatic shape. In this example, the shape of the extrusion block 12 is, for example, a plate-like shape with the X-axis direction as the longitudinal direction and the Y-axis direction as the thickness direction. The tip 12a of the extrusion block 12 contacts the curved surface 10b of the permanent magnet 10. The shape of the tip portion 12a is a concave shape that follows the convex shape of the curved surface 10b of the permanent magnet 10. The extrusion block 12 is driven by an extrusion block actuator 13. The extrusion block actuator 13 moves the extrusion block 12 in the front-back direction. The push-out block 12 has a distal end 12a shaped along the curved surface 10b of the permanent magnet 10, and the push-out block actuator 13 pushes out the permanent magnet 10, so that the permanent magnet 10 is pushed out in a stable posture. The extrusion block 12 is an example of a pressing section.

Before attaching the permanent magnet 10 to the rotor core 30, the extrusion block 12 is moved by the extrusion block actuator 13 to a position where the tip end 12a does not protrude from the curved surface 11b of the gripping block 11. As a result, when the entire magnet attachment head section 100 retreats, that is, when the entire magnet attachment head section 100 separates from the rotor core 30, the tip end 12a of the push-out block 12 does not protrude from the curved surface 11b of the grip block 11. . Further, the orientation of the tip end 12a of the extrusion block 12 is adjusted to be the same as the orientation of the curved surface 11b of the gripping block 11. Thereby, the curved surface 11b of the grip block 11 and the curved surface of the tip end 12a of the extrusion block 12 are adjusted so as to align with the curved surface 10b of the permanent magnet 10.

Further, when attaching the permanent magnet 10 to the rotor core 30, the extrusion block 12 is moved by the extrusion block actuator 13 to a position where the tip portion 12a protrudes from the curved surface 11b of the gripping block 11. As a result, when the entire magnet attachment head section 100 moves forward, that is, when the entire magnet attachment head section 100 approaches the rotor core 30, the tip end 12a of the extrusion block 12 is, for example, 30 mm away from the curved surface 11b of the gripping block 11. outstanding to some degree. At this time, the permanent magnet 10 is stably pushed out straight.

Next, with reference to FIG. 8, problems that may occur in a comparative example in which the rotor 3 of Embodiment 1 does not have the adhesive storage groove 30a will be described.
FIGS. 8A to 8C are diagrams showing examples of attaching permanent magnets to a rotor of a comparative example with respect to the first embodiment.
In FIG. 8, the same or corresponding parts between the rotor of the comparative example and the rotor 3 of the first embodiment are given the same reference numerals, and overlapping explanations will be simplified or omitted as appropriate.
In FIG. 8, a cross-sectional view of the rotor 3 taken along a plane corresponding to the plane AA in FIG. 3 is shown.

In FIG. 8A, the state of the adhesive 20p being spread out on the bottom surface 10a of the permanent magnet 10p to be attached first is shown. When attaching the permanent magnet 10p whose bottom surface 10a is coated with the adhesive 20p to the adhesive surface 32p of the rotor core 30, the permanent magnet 10p is attached slightly inside in the axial direction so as not to interfere with the lower positioning tool 40p. It will be done. When the permanent magnet 10p is pressed against the adhesive surface 32p from the radial direction, the permanent magnet 10p is attracted to the rotor core 30 by the magnetic attraction between the magnetized permanent magnet 10p and the rotor core 30. As a result, the adhesive 20p is spread out and protrudes from the axial end of the permanent magnet 10p. At this time, the adhesive 20p protruding from between the end of the permanent magnet 10p and the adhesive surface 32p may flow to the adhesive surface 32q adjacent in the axial direction.

In this example, after the magnetized permanent magnet 10p is attached to the adhesive surface 32p, the axially adjacent magnetized permanent magnet 10q is attached to the adhesive surface 32q before the adhesive 20p is sufficiently cured. Can be pasted.

FIG. 8B shows the state of the adhesive 20q being spread out on the bottom surface 10a of the permanent magnet 10q that will be attached later. When attaching the permanent magnet 10q, whose bottom surface 10a is coated with the adhesive 20q, to the adhesive surface 32q of the rotor core 30, the permanent magnet 10q is attached slightly inward in the axial direction so as not to interfere with the upper positioning tool 40q. . When permanent magnet 10q is pressed against adhesive surface 32q from the radial direction, permanent magnet 10q is attracted to rotor core 30 by the magnetic attraction force between magnetized permanent magnet 10q and rotor core 30. As a result, the adhesive 20q is spread out and protrudes from the axial end of the permanent magnet 10q. At this time, the adhesive 20q that has protruded may overlap the adhesive 20p that has already flowed to the adhesive surface 32q. As a result, the adhesive layer on the bottom surface 10a of the permanent magnet 10q may have different thicknesses, which may affect the adhesive strength and stress on the permanent magnet 10q.

Moreover, depending on the hardening state of the adhesive 20p applied to the permanent magnet 10p that is attached first, the permanent magnet 10q that is attached later may be tilted.

FIG. 8C shows a state in which the permanent magnets 10 have moved away from each other due to magnetic repulsion between the permanent magnets 10. The permanent magnet 10p moves outward in the axial direction until it hits the restriction part 41 of the lower positioning tool 40p, and further movement is restricted by the restriction part 41. The permanent magnet 10q moves outward in the axial direction until it hits the restriction part 41 of the upper positioning tool 40q, and further movement is restricted by the restriction part 41. In this way, the permanent magnet 10p is fixed in contact with the regulating part 41 of the lower positioning tool 40p, and the permanent magnet 10q is fixed in a state in contact with the regulating part 41 of the upper positioning tool 40q.

In this way, the adhesive storage groove 30a is provided in the rotor core 30 of the first embodiment so as to suppress the decrease in adhesive strength of the bottom surface 10a of the permanent magnet 10 or the inclination of the permanent magnet 10.

Next, an example of a method for manufacturing the rotor 3 of the first embodiment will be described using FIG. 9.
9A and 9B are diagrams showing an example of how permanent magnets 10 are attached to rotor 3 according to the first embodiment.
In FIG. 9, a sectional view of the rotor 3 taken along a plane corresponding to plane AA in FIG. 3 is shown.

Before the permanent magnets 10 are attached, a lower positioning tool 40p and an upper positioning tool 40q are attached to both ends of the rotor core 30 in the axial direction.

The permanent magnet 10p to be pasted first is gripped by the gripping block 11 of the magnet pasting head section 100. At this time, the permanent magnet 10p is centered by the magnetic chuck 14. Further, the longitudinal position of the permanent magnet 10p is determined by a Z-axis pusher 16 and a positioning block 18. Adhesive 20p is applied to the bottom surface 10a of the permanent magnet 10p held by the holding block 11. Thereafter, the magnet attachment head unit pushes the extrusion block 12 forward while moving forward so as to approach the rotor core 30, thereby pressing the bottom surface 10a of the permanent magnet 10p against the adhesive surface 32p.

FIG. 9A shows a state of the adhesive 20p being spread out on the bottom surface 10a of the permanent magnet 10p. When attaching the permanent magnet 10p whose bottom surface 10a is coated with the adhesive 20p to the adhesive surface 32p of the rotor core 30, the permanent magnet 10p is attached slightly inside in the axial direction so as not to interfere with the lower positioning tool 40p. It will be done. When the permanent magnet 10p is pressed against the adhesive surface 32p from the radial direction, the permanent magnet 10p is attracted to the rotor core 30 by the magnetic attraction between the magnetized permanent magnet 10p and the rotor core 30. As a result, the adhesive 20p is spread out and protrudes from the axial end of the permanent magnet 10p. At this time, the adhesive 20p protruding from between the end of the permanent magnet 10p and the adhesive surface 32p flows into the adhesive storage groove 30a. Therefore, the adhesive 20p is prevented from flowing from the adhesive surface 32p to the axially adjacent adhesive surface 32q. Furthermore, by visually checking the adhesive 20p accumulated in the adhesive storage groove 30a, it is possible to easily and reliably confirm that the entire bottom surface 10a of the permanent magnet 10p is uniformly filled with the adhesive 20p. become.

In this example, after the magnetized permanent magnet 10p is attached to the adhesive surface 32p, the axially adjacent magnetized permanent magnet 10q is attached to the adhesive surface 32q before the adhesive 20p is sufficiently cured. Can be pasted. The magnet pasting head section 100 presses the permanent magnet 10q, whose bottom surface 10a is coated with an adhesive 20q, against the adhesive surface 32q in the same manner as the permanent magnet 10p.

FIG. 9B shows the state of the adhesive 20q being spread out on the bottom surface 10a of the permanent magnet 10q that will be attached later. When attaching the permanent magnet 10q, whose bottom surface 10a is coated with the adhesive 20q, to the adhesive surface 32q of the rotor core 30, the permanent magnet 10q is attached slightly inward in the axial direction so as not to interfere with the upper positioning tool 40q. . When permanent magnet 10q is pressed against adhesive surface 32q from the radial direction, permanent magnet 10q is attracted to rotor core 30 by the magnetic attraction force between magnetized permanent magnet 10q and rotor core 30. As a result, the adhesive 20q is spread out and protrudes from the axial end of the permanent magnet 10q. At this time, the adhesive 20q that has protruded out from between the end of the permanent magnet 10q and the adhesive surface 32q flows into the adhesive storage groove 30a. Therefore, the adhesive 20q is prevented from flowing from the adhesive surface 32q to the axially adjacent adhesive surface 32p. Furthermore, by visually checking the adhesive 20q accumulated in the adhesive storage groove 30a, it is possible to easily and reliably confirm that the entire bottom surface 10a of the permanent magnet 10q is uniformly filled with the adhesive 20q. become.

The adhesive storage groove 30a prevents the overflowing adhesive 20 from entering between the axially adjacent adhesive surfaces 32p and 32q. Therefore, even when the permanent magnets 10 are arranged side by side in the axial direction, a decrease in the adhesive strength of the bottom surface 10a of the permanent magnet 10 or an inclination of the permanent magnet 10 is suppressed.

Thereafter, due to magnetic repulsion between the permanent magnets 10, the permanent magnets 10 move away from each other. The permanent magnet 10p moves outward in the axial direction until it hits the restriction part 41 of the lower positioning tool 40p, and further movement is restricted by the restriction part 41. The permanent magnet 10q moves outward in the axial direction until it hits the restriction part 41 of the upper positioning tool 40q, and further movement is restricted by the restriction part 41. This results in the state shown in FIG. 4, where the permanent magnet 10p is fixed in contact with the regulating part 41 of the lower positioning tool 40p, and the permanent magnet 10q is fixed in a state in which it is in contact with the regulating part 41 of the upper positioning tool 40q. Fixed.

After that, all the permanent magnets 10 are attached, and after the adhesive applied to the last permanent magnet 10 has sufficiently hardened, that is, after all the permanent magnets 10 are fixed by adhesive, the axis of the rotor core 30 is The lower positioning tool 40p and the upper positioning tool 40q are removed from both ends in the direction.

As explained above, the permanent magnet motor 1 according to the first embodiment includes the stator 2 and the rotor 3. The stator 2 is arranged coaxially with the rotor 3. In the stator 2, coils around which the stator winding 5 is wound are arranged side by side in the circumferential direction. The rotor 3 includes a plurality of permanent magnets 10 and a rotor core 30. The rotor core 30 is rotatably provided around the rotation axis of the permanent magnet motor 1. In the rotor core 30, a plurality of bonding surfaces 32 are provided, which are arranged so as to circumferentially go around the side surface and form a plurality of axially adjacent rows. A permanent magnet 10 is adhered to each adhesive surface 32. In the rotor core 30, an adhesive storage groove 30a whose longitudinal direction is the circumferential direction is provided between a pair of axially adjacent adhesive surfaces 32 among the plurality of adhesive surfaces 32.
Further, the method for manufacturing the rotor 3 includes a first coating step and a first pressing step. In the first application step, adhesive is applied to one or both of the adhesive surface 32p, which is one of the plurality of adhesive surfaces 32 provided on the rotor core 30, or the bottom surface 10a of the permanent magnet 10p that is adhered to the adhesive surface 32p. This is the process of applying No. 20. The first pressing step is performed after the first application step. The first application step is a step of pressing the bottom surface 10a of the permanent magnet 10p against the adhesive surface 32p from the radial direction.
The rotor 3 manufacturing device also includes a grip block 11 and an extrusion block 12. The gripping block 11 grips the permanent magnet 10p from the opposite side of the bottom surface 10a. The extrusion block 12 holds the bottom surface 10a of the permanent magnet 10p, which is being held by the gripping block 11, with the adhesive 20p applied to one or both of the bottom surface 10a and the adhesive surface 32p of the permanent magnet 10p, to the adhesive surface 32p. and press from the radial direction.

With such a configuration, the adhesive 20 protruding from between the bottom surface 10a of the permanent magnet 10 and the adhesive surface flows into the adhesive storage groove 30a, so that the adhesive 20 that protrudes from between the bottom surface 10a of the permanent magnet 10 and the adhesive surface flows into the adhesive storage groove 30a. The influence of the protruding adhesive 20 can be suppressed. Thereby, the permanent magnets 10 arranged in a plurality of rows in the axial direction can be bonded more reliably.

Further, the method for manufacturing the rotor 3 includes a confirmation step. The confirmation process is performed after the first pressing process. The confirmation step is performed by the adhesive 20p flowing out from the axial end of the bottom surface 10a of the permanent magnet 10p into the adhesive storage groove 30a provided between the axially adjacent adhesive surfaces 32p and 32q. This is a step of checking whether the permanent magnet 10p is properly bonded.

With this configuration, it becomes possible to easily and reliably visually confirm that the entire bottom surface 10a of the permanent magnet 10 is filled with the adhesive 20, thereby preventing peeling of the permanent magnet 10, etc. The occurrence of manufacturing defects in the rotor 3 can be suppressed.

Further, in the rotor core 30, the plurality of adhesive surfaces 32 are arranged in two rows adjacent to each other in the axial direction. At this time, the method for manufacturing the permanent magnet motor 1 includes an attaching step, a second coating step, a second pressing step, and a removing step. The attachment process is performed before the first application process. The attachment process is a process of attaching the lower positioning tool 40p and the upper positioning tool 40q to the rotor core 30. The lower positioning tool 40p is attached to one end of the rotor core 30 so as to protrude in the radial direction from the adhesive surface 32p, thereby restricting movement of the permanent magnet 10p outward in the axial direction. The upper positioning tool 40q is attached to the other end of the rotor core 30 so as to protrude radially from the adhesive surface 32q, thereby restricting the axial movement of the permanent magnet 10q to the outside. The second application step is performed after the attachment step. The second application step is a step of applying the adhesive 20q to one or both of the adhesive surface 32q and the bottom surface 10a of the permanent magnet 10q. The second pressing step is performed after the first pressing step and after the second application step. The second pressing step is a step of pressing the bottom surface 10a of the permanent magnet 10q against the adhesive surface 32q from the radial direction. The removal process is performed after the second pressing process. The removal process is a process of removing the lower positioning tool 40p and the upper positioning tool 40q from the rotor core 30.

With such a configuration, the upper positioning tool 40q and the lower positioning tool 40p suppress positional displacement due to magnetic repulsion between the permanent magnets 10 adjacent to each other in the axial direction. Thereby, the accuracy of attaching the permanent magnet 10 can be further improved.

Further, the second pressing step is performed after the first pressing step and before the permanent magnet 10p is fixed to the adhesive surface 32p with the adhesive 20p.

With such a configuration, the upper positioning tool 40q and the lower positioning tool 40p can suppress the positional shift of the permanent magnet 10, so that the permanent magnet 10 can be pasted without waiting for the adhesive 20p applied to the permanent magnet 10p to fully harden. The permanent magnet 10q can be attached to the permanent magnet 10q. Thereby, the working efficiency in manufacturing the rotor 3 is further improved.

Further, the lower positioning tool 40p has a regulating portion 41. The regulating portion 41 faces the adhesive surface 32p without contacting it. The regulating portion 41 contacts the axial end of the permanent magnet 10p and regulates the movement of the permanent magnet 10p in the axial direction.
Further, the upper positioning tool 40q has a regulating portion 41. The regulating portion 41 faces the adhesive surface 32q without contacting it. The regulating portion 41 contacts the axial end of the permanent magnet 10q and regulates the axial movement of the permanent magnet 10q.

With such a configuration, the protruding adhesive 20 becomes difficult to adhere to the regulating portion 41, so that the upper positioning tool 40q and the lower positioning tool 40p can be easily removed after the adhesive 20 has hardened. Thereby, the working efficiency in manufacturing the rotor 3 is further improved.

Note that the second pressing step may be performed after the first pressing step and after the permanent magnet 10p is fixed to the adhesive surface 32p with the adhesive 20p.

With such a configuration, the permanent magnet 10p that is attached first will not be misaligned, so that the accuracy of attaching the permanent magnet 10p can be further improved.

To summarize the above description, possible configurations of the technology according to the present disclosure include each configuration shown as an additional note below.
(Additional note 1)
A rotor core that is rotatably installed around the rotation axis of a permanent magnet motor.
A plurality of adhesive surfaces are provided, each of which has a permanent magnet adhered thereto, and which are arranged circumferentially around the side surface and arranged in a plurality of axially adjacent rows;
An adhesive storage groove whose longitudinal direction is in the circumferential direction is provided between a pair of axially adjacent adhesive surfaces among the plurality of adhesive surfaces.
Rotor core of permanent magnet motor.
(Additional note 2)
The rotor core described in Appendix 1,
a plurality of permanent magnets adhered to each of the plurality of adhesive surfaces of the rotor core;
A permanent magnet motor rotor.
(Additional note 3)
The rotor described in Appendix 2,
a stator that is arranged coaxially with the rotor, and in which coils around which stator windings are wound are arranged side by side in the circumferential direction;
Permanent magnet motor.
(Additional note 4)
Among the plurality of adhesive surfaces provided on the rotor core according to Supplementary Note 1, one or both of the first adhesive surface, which is any one of the adhesive surfaces, or the bottom surface of the first permanent magnet that is adhered to the first adhesive surface. a first application step of applying an adhesive;
After the first application step, a first pressing step of pressing the bottom surface of the first permanent magnet against the first adhesive surface from a radial direction;
A method of manufacturing a rotor of a permanent magnet motor, comprising:
(Appendix 5)
After the first pressing step, the first adhesive is applied to an adhesive surface adjacent to the first adhesive surface in the axial direction among the plurality of adhesive surfaces and the adhesive storage groove provided between the first adhesive surfaces. The method for manufacturing a rotor for a permanent magnet motor according to Supplementary Note 4, comprising a step of confirming whether or not the adhesion of the first permanent magnet is good by leaking adhesive from the axial end of the bottom surface of the permanent magnet.
(Appendix 6)
In the rotor core, the plurality of adhesive surfaces are arranged in two adjacent rows in the axial direction,
a first positioning tool that is attached to one end of the rotor core so as to protrude radially from the first adhesive surface to restrict axial movement of the first permanent magnet; and A second permanent magnet attached to the other end of the rotor core so as to protrude radially from a second adhesive surface adjacent to the first adhesive surface in the axial direction, thereby controlling the axial movement of a second permanent magnet bonded to the second adhesive surface. an attachment step of attaching the described second positioning tool to the rotor core before the first application step;
After the attachment step, a second application step of applying an adhesive to one or both of the second adhesive surface or the bottom surface of the second permanent magnet;
After the first pressing step and the second application step, a second pressing step of pressing the bottom surface of the second permanent magnet against the second adhesive surface from the radial direction;
a removal step of removing the first positioning tool and the second positioning tool from the rotor core after the second pressing step;
A method for manufacturing a rotor of a permanent magnet motor according to appendix 4 or 5, comprising:
(Appendix 7)
The second pressing step is performed after the first pressing step and before the first permanent magnet is fixed to the first adhesive surface with an adhesive.
A method for manufacturing a rotor of a permanent magnet motor according to appendix 6.
(Appendix 8)
The second pressing step is performed after the first permanent magnet is fixed to the first adhesive surface with an adhesive after the first pressing step.
A method for manufacturing a rotor of a permanent magnet motor according to appendix 6.
(Appendix 9)
The first positioning tool faces the first adhesive surface without contacting it, contacts the axial end of the first permanent magnet, and controls the movement of the first permanent magnet in the axial direction. having a section;
A method for manufacturing a rotor for a permanent magnet motor according to any one of Supplementary notes 6 to 8.
(Appendix 10)
The second positioning tool faces the second adhesive surface without contacting it, and contacts the axial end of the second permanent magnet, thereby regulating the movement of the second permanent magnet in the axial direction. having a section;
A method for manufacturing a rotor for a permanent magnet motor according to any one of Supplementary notes 6 to 9.
(Appendix 11)
a gripping portion that grips a first permanent magnet that is adhered to a first adhesive surface that is one of the plurality of adhesive surfaces provided on the rotor core according to Supplementary Note 1 from the opposite side of the bottom surface;
The bottom surface of the first permanent magnet held by the gripping section with adhesive applied to one or both of the bottom surface of the first permanent magnet and the first adhesive surface is placed against the first adhesive surface. a pressing part that presses from the radial direction;
A permanent magnet motor rotor manufacturing device, comprising:

1 Permanent magnet motor, 2 Stator, 3 Rotor, 4 Magnetic pole teeth, 5 Stator winding, 10, 10p, 10q Permanent magnet, 10a Bottom surface, 10b Curved surface, 11 Gripping block, 11a Square hole, 11b Curved surface, 12 Extrusion block , 12a tip, 13 extrusion block actuator, 14 magnetic chuck, 15 magnetic chuck actuator, 16 Z-axis pusher, 17 Z-axis pusher actuator, 18 positioning block, 19 positioning block actuator, 20, 20p, 20q adhesive , 30 rotor core, 30a adhesive storage groove, 31 magnet sticking groove, 32, 32p, 32q adhesive surface, 40p lower positioning tool, 40q upper positioning tool, 41 regulating part, 100 magnet sticking head part

Claims (11)

A rotor core that is rotatably installed around the rotation axis of a permanent magnet motor.
A plurality of adhesive surfaces are provided, each of which has a permanent magnet adhered thereto, and which are arranged circumferentially around the side surface and arranged in a plurality of axially adjacent rows;
An adhesive storage groove whose longitudinal direction is in the circumferential direction is provided between a pair of axially adjacent adhesive surfaces among the plurality of adhesive surfaces.
Rotor core of permanent magnet motor. The rotor core according to claim 1;
a plurality of permanent magnets adhered to each of the plurality of adhesive surfaces of the rotor core;
A permanent magnet motor rotor. A rotor according to claim 2;
a stator that is arranged coaxially with the rotor, and in which coils around which stator windings are wound are arranged side by side in the circumferential direction;
Permanent magnet motor. One or both of a first adhesive surface that is any one of the plurality of adhesive surfaces provided on the rotor core according to claim 1 or a bottom surface of a first permanent magnet that is adhered to the first adhesive surface. a first application step of applying adhesive to;
After the first application step, a first pressing step of pressing the bottom surface of the first permanent magnet against the first adhesive surface from a radial direction;
A method of manufacturing a rotor of a permanent magnet motor, comprising: After the first pressing step, the first adhesive is applied to an adhesive surface adjacent to the first adhesive surface in the axial direction among the plurality of adhesive surfaces and the adhesive storage groove provided between the first adhesive surfaces. 5. The method for manufacturing a rotor for a permanent magnet motor according to claim 4, further comprising a step of confirming whether adhesion of the first permanent magnet is good or not based on an adhesive flowing out from an axial end of a bottom surface of the permanent magnet. In the rotor core, the plurality of adhesive surfaces are arranged in two adjacent rows in the axial direction,
a first positioning tool that is attached to one end of the rotor core so as to protrude radially from the first adhesive surface to restrict axial movement of the first permanent magnet; and A second permanent magnet attached to the other end of the rotor core so as to protrude radially from a second adhesive surface adjacent to the first adhesive surface in the axial direction, thereby controlling the axial movement of a second permanent magnet bonded to the second adhesive surface. an attachment step of attaching the described second positioning tool to the rotor core before the first application step;
After the attachment step, a second application step of applying an adhesive to one or both of the second adhesive surface or the bottom surface of the second permanent magnet;
After the first pressing step and the second application step, a second pressing step of pressing the bottom surface of the second permanent magnet against the second adhesive surface from the radial direction;
a removal step of removing the first positioning tool and the second positioning tool from the rotor core after the second pressing step;
A method for manufacturing a rotor for a permanent magnet motor according to claim 4, comprising: The second pressing step is performed after the first pressing step and before the first permanent magnet is fixed to the first adhesive surface with an adhesive.
A method for manufacturing a rotor for a permanent magnet motor according to claim 6. The second pressing step is performed after the first permanent magnet is fixed to the first adhesive surface with an adhesive after the first pressing step.
A method for manufacturing a rotor for a permanent magnet motor according to claim 6. The first positioning tool faces the first adhesive surface without contacting it, contacts the axial end of the first permanent magnet, and controls the movement of the first permanent magnet in the axial direction. having a section;
A method for manufacturing a rotor for a permanent magnet motor according to claim 6. The second positioning tool faces the second adhesive surface without contacting it, and contacts the axial end of the second permanent magnet, thereby regulating the movement of the second permanent magnet in the axial direction. having a section;
A method for manufacturing a rotor for a permanent magnet motor according to claim 6. A gripping portion that grips a first permanent magnet that is adhered to a first adhesive surface that is any one of the plurality of adhesive surfaces provided on the rotor core according to claim 1 from the side opposite to the bottom surface. ,
The bottom surface of the first permanent magnet held by the gripping section with adhesive applied to one or both of the bottom surface of the first permanent magnet and the first adhesive surface is placed against the first adhesive surface. a pressing part that presses from the radial direction;
A permanent magnet motor rotor manufacturing device, comprising:

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