JP5556400B2 - Rotor core member and permanent magnet fixing method - Google Patents

Description

  The present invention relates to a rotor core member used as a rotor of a motor and a permanent magnet fixing method for fixing a permanent magnet to the rotor core member, and particularly suitable for an embedded permanent magnet motor. It is.

  In the embedded permanent magnet motor, a permanent magnet embedded hole is formed in a laminated rotor core member constituting the rotor, and the permanent magnet is mounted and fixed in the permanent magnet embedded hole. The fixing of the permanent magnet is a big problem for the embedded permanent magnet motor. When the motor is operated without firmly fixing the permanent magnet, there arises a problem that the permanent magnet moves, vibrates, generates noise, or cracks. On the other hand, a gap (tolerance) is required between the permanent magnet embedding hole and the permanent magnet. If there is no gap, the magnet cannot be inserted in the first place. Furthermore, since permanent magnets are brittle and break immediately due to a slight stress concentration, there are restrictions on the fixing method. Although there is a method using an adhesive, it is necessary to take measures against the thermal expansion difference (management of the adhesive layer thickness, etc.) and measures against chemical instability.

  In the following Patent Document 1, after inserting a permanent magnet into a rectangular permanent magnet embedding hole, the protrusions projecting from both ends of the long side of the permanent magnet embedding hole are bent and plastically deformed. It fixes so that both magnetic pole surfaces of a permanent magnet may be pinched. That is, in the permanent magnet mounting and fixing method described in Patent Document 1, a gap is provided when the permanent magnet is inserted, and the permanent magnet is fixed by reducing the gap after the permanent magnet is inserted. It is also unnecessary to take measures.

JP 2001-258187 A

However, in Patent Document 1, even if the bent protrusion is pressed against the magnetic pole surface of the permanent magnet and plastically deformed, there is a return of elastic deformation, so-called spring back, so the magnetic pole surface of the protrusion and the permanent magnet. A gap remains between them. Although this gap can be reduced, it cannot be eliminated in principle. Therefore, the force for fixing the permanent magnet by the protrusion is zero, and the external magnet is displaced when an external force is applied. Further, the gap between the protrusion and the permanent magnet is enlarged during thermal expansion, and the permanent magnet becomes easier to move.
The present invention has been made to solve these problems, and an object thereof is to provide a rotor core member and a permanent magnet fixing method capable of fixing a permanent magnet with a preset holding force. It is.

  In order to solve the above problems, the rotor core member of the present invention is a rotor core member used as a rotor of a motor, and is equally spaced in the circumferential direction by the number of poles of the rotor. Each of the permanent magnet embedded holes is formed in a rectangular shape having a long side in the circumferential direction and a short side in the radial direction and penetrating in the axial direction. In the rotor core member for mounting and fixing a permanent magnet so that the magnetic poles adjacent to each other are different on the short side of the permanent magnet embedded hole, both ends of the long side of the permanent magnet embedded hole and the permanent magnet The permanent magnet is pressed by an elastic restoring force to the inner side in the long side direction of the permanent magnet embedded hole, which is shorter by a predetermined length than the length between the magnetic pole surfaces of the permanent magnet mounted in the embedded hole. The elastic fixed protrusion to be fixed It is characterized in that it has set.

In addition, when the flux barrier hole is formed to be connected to the permanent magnet embedding hole, an inclination claw for inclining the elastic fixed protrusion is provided on the elastic barrier protrusion on the flux barrier hole side. It is what.
The permanent magnet fixing method of the present invention is a method of fixing a permanent magnet in a permanent magnet embedding hole of the rotor core member by attaching a jig to the tilting claw, and fixing the elastic fixing protrusion. Inclined in the elastic deformation region to the flux barrier hole side, insert a permanent magnet into the permanent magnet embedding hole in that state, then release the inclination of the elastic fixed protrusion by the jig, and the elastic restoring force of the elastic fixed protrusion And pressing the magnetic pole surface of the permanent magnet to fix the permanent magnet.

  Thus, according to the rotor core member of the present invention, the rotor core member is located at both ends of the long side of the permanent magnet embedding hole and by a predetermined length from the length between the magnetic pole surfaces of the permanent magnet mounted in the permanent magnet embedding hole. Because it is configured to project an elastic fixed protrusion on the inner side of the short permanent magnet embedded hole long side direction, and to fix the permanent magnet by pressing the magnetic pole surface of the permanent magnet with the elastic restoring force of the elastic fixed protrusion, The permanent magnet can be fixed with a preset holding force.

  Further, when forming a flux barrier hole connected to the permanent magnet embedding hole, an inclination claw for inclining the elastic fixed protrusion is provided on the flux barrier hole side of the elastic fixed protrusion, for example, a jig. Is attached to the claw for tilting, and the elastic fixed protrusion is inclined to the flux barrier hole side in the elastic deformation region. In this state, the permanent magnet is inserted into the permanent magnet embedding hole, and then the inclination of the elastic fixed protrusion by the jig is released. For example, the magnetic pole surface of the permanent magnet can be pressed and fixed by the elastic restoring force of the elastic fixing protrusion.

  Further, according to the permanent magnet fixing method of the present invention, when the permanent magnet is mounted and fixed in the permanent magnet embedding hole of the rotor core member, the elastic fixing protrusion is attached to the flux barrier hole side by attaching a jig to the inclination claw. In this state, the permanent magnet is inserted into the permanent magnet embedding hole, and then the inclination of the elastic fixed protrusion by the jig is released, and the magnetic force of the permanent magnet is released by the elastic restoring force of the elastic fixed protrusion. By pressing the surface and fixing the permanent magnet, the permanent magnet can be easily fixed with a preset holding force.

It is a longitudinal cross-sectional view which shows one Embodiment of the embedded permanent magnet motor using the rotor core member of this invention. It is a cross-sectional view of the embedded permanent magnet motor of FIG. It is a front view which shows the detail of the rotor of FIG. It is a front view of the rotor core member before the assembly which comprises the rotor of FIG. It is a perspective view which shows the lamination | stacking state of the rotor core member of FIG. It is explanatory drawing which attaches and fixes a permanent magnet to the rotor core member of FIG.

  1 and 2 show an embodiment of an embedded permanent magnet motor assembled by the permanent magnet fixing method of the present invention using the rotor core member of the present invention. This embedded permanent magnet motor supports a stator 1 fixed to the outer structure 4, a permanent magnet embedded rotor 2 disposed inside the stator 1, and the rotor 2. The rotating shaft 3 inserted through the body 4 and a bearing member 5 for rotatably supporting the rotating shaft 3 with respect to the outer structure 4 are configured.

  The stator 1 is configured such that a three-phase winding 7 is applied to a laminated stator core member 6 and connected to a power supply unit by a lead wire 8. The stator core member 6 is obtained by punching a silicon steel plate into a predetermined shape, for example, a shape having 36 slot openings 9 on the inner peripheral surface. The number and polarity of the slot openings 9 of the stator core member 6 should be appropriately set in consideration of characteristics.

  The rotor 2 includes a laminated rotor core member 10 and permanent magnets 12 corresponding to the number of poles mounted and fixed in permanent magnet embedded holes 11 formed in the laminated rotor core member 10. Composed. The rotor core member 10 is formed by punching a silicon steel plate into a predetermined shape. The permanent magnet 12 can be composed of a neodymium rare earth magnet or a ferrite magnet. Note that reference numeral 13 in FIG. 2 denotes a flux barrier hole that is connected to the permanent magnet embedded hole 11. This flux barrier hole 13 prevents the magnetic flux from wrapping around the rotor of the embedded permanent magnet motor, and increases the magnetic flux interlinking with the stator through the gap. Is formed.

  FIG. 3 is a front view showing details of the rotor 2 of FIG. 2, (a) is an overall view, and (b) is a detail view of a part A of (a). In the figure, since four permanent magnets 12 are used, the number of poles of the rotor 2 is four. The permanent magnet embedded holes 11 are provided in a string shape with respect to the circular rotor core member 10 at equal intervals in the circumferential direction by the number of poles of the rotor 2, in this case, four. Each permanent magnet embedding hole 11 is a rectangle having a long side in the circumferential direction and a short side in the radial direction. And the permanent magnet embedding hole 11 of all the rotor core members 10 laminated | stacked is penetrated and formed in the axial direction. The permanent magnet 12 is mounted and fixed in each of the four permanent magnet embedded holes 11. At this time, the magnetic pole surface 14 of the permanent magnet 12 is set to the short side of the permanent magnet embedded hole 11 and magnetic poles adjacent to each other are arranged. Fix it differently. In the present embodiment, since the flux barrier hole 13 is continuously provided on the short side of the permanent magnet embedded hole 11, the short side of the permanent magnet embedded hole 11 is, for example, the magnetic pole surface of the permanent magnet 12 in FIG. 14 is assumed to exist virtually at the position 14. Further, in the long side direction of the permanent magnet embedded hole 11, a side closer to the center of the long side of the permanent magnet embedded hole 11 is defined as an inner side, and a side away from the center is defined as an outer side.

  4A and 4B are front views showing a single state of the rotor core member 10, wherein FIG. 4A is an overall view, and FIG. The two-dot chain line in the figure is a virtual depiction of the permanent magnet 12 mounted in the permanent magnet embedded hole 11, and as described above, the short side of the rectangular permanent magnet embedded hole 11 is the permanent magnet. It exists virtually at the position of 12 magnetic pole surfaces 14. In the present embodiment, the length between the magnetic pole surfaces 14 of the permanent magnet 12, for example, the width in the left-right direction in FIG. For example, an elastic fixed protrusion 15 is projected from the radially inner side to the outer side of the rotor core member 10 at the inner position in the long-side direction of the permanent magnet embedded hole that is shorter by 1 mm on one side. Further, an inclined claw 16 is projected from the central portion of the side surface of the flux barrier hole 13 of the elastic fixed protrusion 15. The elastic fixed protrusion 15 and the inclined claw 16 are both formed integrally with the rotor core member 10 when the rotor core member 10 is punched.

  The elastic fixed protrusion 15 is a rectangle which is short in the long side direction of the permanent magnet embedding hole 11 and long in the short side direction of the permanent magnet embedding hole 11. A notch 17 is formed to facilitate the inclination of the elastic fixed protrusion 15 toward the flux barrier hole 13 in particular. Further, a corner R is provided at a connecting portion between the elastic fixed protrusion 15 and the inclined claw 16 so as to relieve stress concentration when the inclined claw 16 is pressed by a jig described later. In addition, the code | symbol 3a in a figure is the circular hole opened in the rotor core member 10 in order to penetrate the said rotating shaft 3. As shown in FIG.

  FIG. 5 shows a state in which the rotor core member 10 formed by punching the silicon steel plate is laminated in the thickness direction, and the permanent magnet 12 is mounted and fixed in the permanent magnet embedded hole 11 penetrating in the lamination direction. As shown above, at both ends in the longitudinal direction of the permanent magnet embedding hole 11, elastic fixing protrusions are formed at positions on the inner side in the longitudinal direction of the permanent magnet embedding hole, which is shorter than the length between the magnetic pole faces 14 of the permanent magnet 12. Since the child 15 protrudes, the permanent magnet 12 cannot be inserted into the permanent magnet embedding hole 11 as it is, together with the fact that the permanent magnet 12 is brittle as described above. Therefore, before inserting the permanent magnet 12, as shown in FIG. 5, a jig 18 made of a rod having an oval cross section is inserted into the flux barrier hole 13 penetrating in the stacking direction of the rotor core member 10. To do.

  FIG. 6 a shows a state in which a jig 18 made of a rod having an oval cross section is inserted into the flux barrier hole 13 of the laminated rotor core member 10 before the permanent magnet 12 is mounted and fixed in the permanent magnet embedded hole 11. Show. From this state, for example, when the jig 18 made of a rod having an oval cross section is rotated so as to be twisted in the clockwise direction in the drawing, the jig 18 comes into contact with the inclined claw 16 and further rotates the jig 18, as shown in FIG. Thus, the inclined claw 16 is pushed downward in the figure, and the elastic fixed protrusion 15 is inclined toward the flux barrier hole 13 side accordingly. At this time, the notch 17 formed at the root of the elastic fixed protrusion 15 on the inner side in the long side of the permanent magnet embedded hole is on the flux barrier hole 13 side of the elastic fixed protrusion 15, that is, outward in the direction of the long side of the permanent magnet embedded hole. To make it easier to tilt.

  When the elastic fixed protrusion 15 is inclined toward the flux barrier hole 13 in this way, the length between the magnetic pole faces 14 of the permanent magnet 12 is secured in the permanent magnet embedding hole 11, and in this state, a two-dot chain line in FIG. The permanent magnet 12 is inserted into the permanent magnet embedding hole 11 as shown in FIG. When the permanent magnet 12 has been inserted into the permanent magnet embedding hole 11 in this way, as shown in FIG. 6c, the jig 18 made of, for example, an oval cross-section bar is rotated counterclockwise, and the flux of the elastic fixed protrusion 15 is increased. When the inclination toward the barrier hole 13 is released, the elastic fixed protrusion 15 is elastically restored and comes into contact with the magnetic pole surface 14 of the permanent magnet 12. In the figure, the elastic fixed protrusion 15 is not inclined toward the flux barrier hole 13 only at one end in the long side direction of the permanent magnet embedded hole 11, but actually the long side of the permanent magnet embedded hole 11 It is necessary to incline the elastic fixed protrusion 15 toward the flux barrier hole 13 at both ends in the direction.

  The elastic fixed protrusion 15 is located at both ends of the long side of the permanent magnet embedding hole 11, that is, near the short side, and the long side of the permanent magnet embedding hole that is shorter than the length between the magnetic pole faces 14 of the permanent magnet 12 by a predetermined length. Since the elastic fixed protrusion 15 is in contact with the permanent magnet 12, the elastic restoring force remains if the elastic deformation corresponding to the predetermined length is reduced and reduced. That is, in the permanent magnet 12, both magnetic pole surfaces 14 are sandwiched by the elastic restoring force of the elastic fixed protrusion 15, and the elastic restoring force that sandwiches the permanent magnet 12 becomes a force that fixes the permanent magnet 12. .

  This elastic restoring force is of course determined in accordance with a predetermined length shorter than the length between the magnetic pole faces 14 of the permanent magnet 12, although the tolerance varies, so the force for fixing the permanent magnet 12 is also constant. stable. In the permanent magnet fixing method described in Patent Document 1, in addition to the fact that the force for pinching the permanent magnet is almost zero, the permanent magnet according to the amount of bending or the bending strength in the step of bending the protrusion. The power to hold will change. On the other hand, the permanent magnet fixing method of the present embodiment has an advantage that the force for holding the permanent magnet 12 is constant and stable.

  In addition, in the present embodiment, the elastic fixed protrusion 15 is provided so as to protrude from the inner side in the rotor core member radial direction of the permanent magnet embedded hole 11 to the outer side. It is not the entirety of the magnetic pole surface 14 but the abutment with the permanent magnet 12 that is elastically restored, but is brought into contact with the inner corner of the magnetic core surface 14 in the rotor core member radial direction. It can be pressed against the outer surface of the core member in the radial direction, and the fixing position of the permanent magnet 12 can be regulated and stabilized, whereby the rotational balance of the rotor 2 itself can be stabilized.

  As described above, in the rotor core member 10 of the present embodiment, the length between the magnetic pole faces 14 of the permanent magnets 12 at both ends of the long side of the permanent magnet embedded hole 11 and mounted in the permanent magnet embedded hole 11 is determined. An elastic fixed protrusion 15 is protruded at the inner side in the long side direction of the permanent magnet embedding hole that is shorter by a predetermined length, and the magnetic surface 14 of the permanent magnet 12 is pressed by the elastic restoring force of the elastic fixed protrusion 15. Since 12 is fixed, the permanent magnet 12 can be fixed with a holding force set in advance.

  Further, when the flux barrier hole 13 is formed so as to be connected to the permanent magnet embedded hole 11, an inclination claw 16 for inclining the elastic fixed protrusion 15 is provided on the elastic barrier protrusion 15 side. As a result, the jig 18 is applied to the claw 16 for tilting, the elastic fixed protrusion 15 is tilted toward the flux barrier hole 13 in the elastic deformation region, and the permanent magnet 12 is inserted into the permanent magnet embedding hole 11 in this state, If the inclination of the elastic fixed protrusion 15 by the jig 18 is released, the magnetic pole surface 14 of the permanent magnet 12 can be pressed and fixed by the elastic restoring force of the elastic fixed protrusion 15.

Further, in the permanent magnet fixing method of the present embodiment, when the permanent magnet 12 is mounted and fixed in the permanent magnet embedded hole 11 of the rotor core member 10, the jig 18 is applied to the tilting claw 16 and the elastic fixed protrusion 15. Is tilted toward the flux barrier hole 13 in the elastic deformation region, and the permanent magnet 12 is inserted into the permanent magnet embedding hole 11 in this state, and then the inclination of the elastic fixing protrusion 15 by the jig 18 is released, and the elastic fixing protrusion By pressing the magnetic pole surface 14 of the permanent magnet 12 with the elastic restoring force of the child 15 to fix the permanent magnet 12, the permanent magnet 12 can be easily fixed with a preset holding force.
In the above-described embodiment, a four-pole single-character permanent magnet motor is described as an example of the embedded permanent magnet motor. However, the embedded permanent magnet motor to which the present invention is applicable is not limited to this. .

1 is a stator, 2 is a rotor, 3 is a rotating shaft, 4 is an outer structure, 5 is a bearing member, 6 is a stator core member, 7 is a three-phase winding, 8 is a lead wire, and 9 is a slot opening. 10 is a rotor core member, 11 is a permanent magnet embedding hole, 12 is a permanent magnet, 13 is a flux barrier hole, 14 is a magnetic pole surface, 15 is an elastic fixed protrusion, 16 is an inclined claw, 17 is a notch, 18 is a notch Jig

Claims (2)

A rotor core member that is used as a rotor of a motor, and is provided in a string shape at equal intervals in the circumferential direction for the number of poles of the rotor, and has a circumferential side as a long side and a radial direction. A permanent magnet embedded hole which is a rectangle having a short side and penetrates in the axial direction, a flux barrier hole is formed in connection with the permanent magnet embedded hole, and a magnetic pole surface is attached to each of the permanent magnet embedded holes. In a rotor core member for mounting and fixing a permanent magnet so that magnetic poles adjacent to each other are different on the short side of the permanent magnet embedding hole, the permanent magnet embedding is provided at both ends of the long side of the permanent magnet embedding hole. The permanent magnet is fixed by pressing the magnetic pole surface of the permanent magnet with elastic restoring force at the inner side in the long-side direction of the permanent magnet embedded hole, which is shorter by a predetermined length than the length between the magnetic pole surfaces of the permanent magnet mounted in the hole. Elastic solid While projecting the projections, inclined nail for the said jig When inserted through the oval cross-section rod-shaped jig is rotated to a flux barrier holes for tilting the elastic fixing projections in contact with the flux barrier holes side the A rotor core member characterized in that it is provided on the flux barrier hole side of an elastic fixed protrusion. A method for attaching and fixing a permanent magnet in a permanent magnet embedding hole of the rotor core member according to claim 1 , wherein a jig inserted into the flux barrier hole is rotated to form a jig on the inclined claw. The elastic fixed protrusion is inclined toward the flux barrier hole side in the elastic deformation region, and a permanent magnet is inserted into the permanent magnet embedded hole in that state, and then the inclination of the elastic fixed protrusion due to the jig is released. A permanent magnet fixing method, wherein the permanent magnet is fixed by pressing a magnetic pole surface of the permanent magnet with an elastic restoring force of the elastic fixing protrusion.

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