JP2013099051A - Rotor of permanent magnet rotary electric machine and permanent magnet rotary electric machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a rotor of a permanent magnet rotary electric machine that prevents enlargement of axial size of an outer edge of a rotor core and ensures desired output, and to provide a permanent magnet rotary electric machine provided with the same.SOLUTION: A rotor 1 comprises: a rotor core 3 that has a plurality of laminated magnetic steel sheets 30; and a plurality of permanent magnets 5 that are embedded in a plurality of respective magnet housing holes 32 that are bored through the rotor core 3 in an axial direction of a rotation shaft. The magnet housing holes 32 are disposed in such a manner that each adjacent pair of the magnet housing holes 32 spreads toward an outer edge 31 of the rotor core 2. An end plate 2 is disposed at each of two ends of the rotor core 3 along the axial direction of the rotating shaft. Each end plate 2 has an erected portion 21 that is formed, in a direction facing away from the rotor core 3, between an inner end 322 of each magnet housing hole 32 and the outer edge 31 along a radial direction of the rotating shaft.

Description

  The present invention relates to a rotor of a permanent magnet type rotating electrical machine having a rotor core formed by laminating a plurality of magnetic steel sheets and a plurality of permanent magnets embedded in the axial direction with respect to the rotor core, and a permanent magnet type equipped with the rotor It relates to a rotating electrical machine.

  A rotor of a permanent magnet type rotating electrical machine generally includes a rotor core formed by laminating a plurality of magnetic steel plates and a plurality of permanent magnets embedded in the rotor core in the axial direction. Therefore, the rotor core is provided with a magnet accommodation hole for embedding the permanent magnet in the axial direction. And in the some magnetic steel plate which comprises a rotor core, the penetration part for magnet arrangement | positioning for forming a magnet accommodation hole is formed in several places. By laminating a plurality of magnetic steel plates so that the magnet placement through portions overlap in the axial direction, a rotor core having a plurality of magnet housing holes is obtained. End plates are disposed at both ends of the rotor core in the axial direction, and are fixed by fixing members that penetrate the rotor core and the end plate (see Patent Document 1 and Patent Document 2).

In Patent Document 1, a rivet hole through which a rivet that is a fixing member is inserted, a convex portion formed on a circumference surrounding the rivet hole, and a float that is formed on the inner peripheral side of the convex portion and does not partially contact the rotor core. The structure which compresses a rotor core uniformly by the end plate provided with the part is proposed.
Patent Document 2 proposes a structure in which the fixing member is eliminated by fitting and holding the rotor core and the end plate inside the metal cylindrical member.

JP 2008-206342 A JP-A-6-153427

However, in a permanent magnet type rotating electrical machine having a rotor core formed by laminating a plurality of magnetic steel plates, the following problems may occur.
Each of the plurality of magnetic steel plates constituting the rotor core has a small thickness and a low strength, and therefore tends to be deformed. Thereby, there exists a possibility that the outer peripheral side of a magnetic steel plate may warp and deform | transform easily in the thickness direction. In particular, when the magnetic steel sheet is punched out by a press to obtain a desired shape, there is a sufficient possibility that the magnetic steel sheet will warp in the thickness direction.
In addition, the magnetic steel plate is formed with a magnet arrangement through portion that constitutes a magnet housing hole of the rotor core. Therefore, the magnetic steel sheet tends to have low rigidity around the periphery, and is likely to warp and deform in the thickness direction.

  When magnetic steel plates having a curved outer peripheral side are laminated to form a rotor core, the axial dimension of the rotor core becomes larger than the design value. If it does so, malfunctions, such as the ratio of the magnetic flux which influences the magnetic pole of a stator among the magnetic fluxes which come out of the permanent magnet of a rotor reduce, will arise, As a result, there exists a possibility that desired output may not be obtained. In addition, when the magnitude and shape of the warp deformation varies among a plurality of magnetic steel sheets, a gap is generated between adjacent magnetic steel sheets, thereby reducing the magnetic permeability of the entire rotor core, thereby causing a desired output. There is also a possibility that it will not be obtained.

  Further, as described above, the rotor core includes end plates that sandwich a plurality of magnetic steel plates from both ends in the stacking direction, but in order to correct a plurality of magnetic steel plates in which warp deformation has occurred with a pair of end plates, It is necessary to obtain rigidity that resists the reaction force of a plurality of magnetic steel plates by increasing the plate thickness. This increases the weight and material costs of the end plate.

  The rotor described in Patent Document 1 is provided with a convex portion on the end plate, but is formed around the rivet hole, and efficiently transmits the pressing force by the fixing member to the magnetic steel plate through the end plate. be able to. On the other hand, since the position of the convex portion is determined by the position of the rivet hole, the effect of improving the rigidity of the end plate tends to be local, and it is difficult to obtain the strength necessary for suppressing the warp deformation of the magnetic steel sheet. In particular, in a permanent magnet type rotating electrical machine, when the magnet housing hole and the rivet hole that are likely to be warped are separated from each other, it is difficult to obtain the strength necessary for suppressing the warp deformation.

  The rotor described in Patent Document 2 has a metal tube for holding a permanent magnet. However, in the configuration in which the permanent magnet is embedded in the rotor core, a metal tube is unnecessary, and providing this is not preferable because it leads to an increase in the number of parts and an increase in the weight of the rotor.

  Moreover, when the rotor which embed | buried the permanent magnet mentioned above inside was comprised using the metal pipe, when inserting a some magnetic steel plate in a metal pipe, there exists a possibility of promoting the curvature deformation of a magnetic steel plate. The end plate is also fitted and fixed to the metal tube. At this time, since the end plate is held by the frictional force between the end plate and the metal tube, the pressing force of the end plate tends to be lower than when a fixed member is used, and the magnetic steel plate is sufficiently pressed. May not be able to be pressed. Further, when the end portion of the metal tube is bent inward to hold the end plate, it is necessary to increase the thickness of the metal tube, which increases the weight and material cost of the rotor.

  The present invention has been made in view of such a background, and includes a rotor for a permanent magnet type rotating electrical machine capable of preventing an increase in axial dimension at the outer peripheral portion of a rotor core and ensuring a desired output, and the same. A permanent magnet type rotating electrical machine is to be provided.

One aspect of the present invention includes a rotor core formed by laminating a plurality of magnetic steel plates, and a plurality of permanent magnets embedded in a plurality of magnet receiving holes formed so as to penetrate the rotor core in the axial direction of the rotation shaft. A rotor of a permanent magnet type rotating electric machine,
The plurality of magnet accommodation holes are arranged such that a pair of adjacent magnet accommodation holes expand toward the outer peripheral edge,
End plates are respectively disposed at both axial ends of the rotation axis of the rotor core, and the end plates are arranged on the inner peripheral side end of the magnet housing hole and the outer peripheral edge of the rotor core in the radial direction of the rotation shaft. In the rotor of the permanent magnet type rotating electrical machine, a standing portion formed toward the opposite side of the rotor core is provided.

  Another aspect of the present invention is a permanent magnet type rotating electrical machine comprising the rotor and a stator disposed on an outer periphery of the rotor (Claim 5).

  In the rotor of the permanent magnet type rotating electric machine, the end plate stands between the inner peripheral side end of the magnet receiving hole and the outer peripheral edge of the rotor core in the radial direction toward the opposite side of the rotor core. The above-mentioned standing part is provided. Furthermore, the standing portion is erected at least between the inner peripheral side end portion of the magnet accommodation hole and the outer peripheral edge of the rotor core in the radial direction.

Therefore, it is possible to improve the rigidity of the end plate in the vicinity of the magnet housing hole where warpage deformation is likely to occur in the magnetic steel plate. Thereby, even if the outer peripheral side of each magnetic steel plate is warped in the thickness direction, they can be laminated to constitute the rotor core, suppressed by the end plate, and prevented from spreading in the lamination direction. That is, it is possible to prevent the axial dimension at the outer peripheral portion of the rotor core from increasing.
As a result, it is possible to prevent a reduction in the proportion of the magnetic flux that affects the magnetic poles of the stator out of the magnetic flux emitted from the permanent magnet, and to secure a desired output of the permanent magnet type rotating electrical machine.

  As described above, according to the present invention, a rotor of a permanent magnet type rotating electrical machine that can prevent an increase in the axial dimension in the outer peripheral portion of the rotor core and ensure a desired output, and a permanent magnet type rotation provided with the same. An electric machine can be provided.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an explanatory view showing a permanent magnet type rotating electrical machine in Embodiment 1. FIG. 3 is an explanatory diagram illustrating a rotor in the first embodiment. The AA arrow directional cross-sectional view in FIG. FIG. 3 is an explanatory diagram showing a rotor core in the first embodiment. BRIEF DESCRIPTION OF THE DRAWINGS FIG. FIG. 6 is an explanatory view showing a rotor in Embodiment 2. The BB arrow directional cross-sectional view in FIG. Explanatory drawing which shows the rotor provided with the end plate which formed the standing part intermittently in Example 3. FIG. Explanatory drawing which shows the rotor provided with the end plate which formed the standing part in polygonal shape in Example 3. FIG.

  In the rotor of the permanent magnet type rotating electrical machine, at least one of the magnetic steel plates may include a communication portion that communicates an outer peripheral side end portion and an outer peripheral edge of the magnet accommodation hole. . In order to prevent magnetic flux leakage at the outer peripheral edge, when the magnet accommodation hole is provided with the communication portion, the rigidity around the magnet accommodation hole is likely to be lowered, and warpage deformation is more likely to occur in the magnetic steel plate. As described above, by using an end plate having excellent strength and effectively suppressing warping deformation of the magnetic steel sheet, the rotor core is axially aligned even when the magnet housing hole includes the communication portion. An increase in the direction can be reliably prevented.

  Moreover, the said standing part may be cyclically | annularly formed in the said end plate along the periphery centering on the said rotating shaft (Claim 3). In this case, since the standing portion is continuously formed along the circumference, the rigidity of the end plate can be effectively improved.

  Further, the pair of end plates and the rotor core are sandwiched from both ends in the axial direction by a fastening member penetrating them in the axial direction of the rotating shaft, and the protruding height of the standing portion is the height of the fastening member. It may be less than the height of the head (claim 4). In this case, the standing portion does not protrude outward in the axial direction from the head of the fastening member. Therefore, even if the standing portion is provided, the rotor can be prevented from becoming larger in the axial direction.

Example 1
A rotor of a permanent magnet type rotating electrical machine according to an embodiment and a permanent magnet type rotating electrical machine including the same will be described with reference to FIGS.
The permanent magnet type rotating electrical machine 10 of this example includes a rotor 1 as shown in FIG. As shown in FIGS. 2 to 4, the rotor 1 includes a rotor core 3 formed by laminating a plurality of magnetic steel plates 30, and a plurality of magnet housing holes 32 formed through the rotor core 3 in the axial direction of the rotation shaft. A plurality of permanent magnets 5 are embedded. The plurality of magnet accommodation holes 32 are arranged such that a pair of adjacent magnet accommodation holes 32 expand toward the outer peripheral edge 31, and end plates 2 are arranged at both axial ends of the rotation axis of the rotor core 3. ing. The end plate 2 has a standing portion 21 formed toward the opposite side of the rotor core 3 between the inner peripheral side end 322 of the magnet housing hole 32 and the outer peripheral edge 31 of the rotor core 3 in the radial direction of the rotating shaft. I have.

Hereinafter, the rotor 1 of the permanent magnet type rotating electrical machine 10 and the permanent magnet type rotating electrical machine 10 of this example will be described in more detail.
As shown in FIG. 1, the permanent magnet type rotating electrical machine 10 of this example includes a rotor 1 and a stator 100 disposed on the outer periphery thereof.

The stator 100 includes an annular stator core 101 and a coil 103 provided in a slot between teeth 102 arranged in a plurality on the inner periphery of the stator core 101.
In addition, the permanent magnet type rotary electric machine 10 of this example is mounted in vehicles, such as an electric vehicle and a hybrid vehicle, for example.

  As shown in FIGS. 1 to 4, the rotor 1 includes a rotor core 3 formed by laminating a plurality of magnetic steel plates 30, a plurality of permanent magnets 5 embedded in the axial direction with respect to the rotor core 3, and a shaft of the rotor core 3. And end plates 2 disposed at both ends in the direction.

  As shown in FIG. 5, the plurality of magnetic steel plates 30 have a substantially disk shape, and have a plurality of magnet housing holes 32 and a shaft hole 34 through which the rotation shaft is inserted. The magnet accommodation hole 32 has a substantially rectangular shape, and has a communication part 321 that communicates the outer peripheral side end 323 of the magnet accommodation hole 32 and the outer peripheral edge 31. The pair of magnet housing holes 32 are arranged so as to be close to each other on the inner circumferential side end 322 in the circumferential direction and away from each other toward the outer circumference.

The magnetic steel sheet 30 is a pair of a bridge portion 35 formed between inner end portions 322 in a pair of magnet housing holes 32 adjacent to each other in the circumferential direction, and a portion on the outer peripheral side of the bridge portion 35. And a peninsula 36 formed between the magnet housing holes 32.
Further, a fixing hole 33 penetrating in the thickness direction is formed at a position shifted from the bridge portion 35 in the magnetic steel plate 30 toward the radially inner peripheral side.

As shown in FIGS. 1 to 4, the rotor core 3 formed by laminating a plurality of magnetic steel plates 30 has a substantially cylindrical shape, and the shape viewed from the lamination direction is the same as the shape of the magnetic steel plates.
As shown in FIG. 4, the permanent magnets 5 are respectively embedded in the plurality of magnet housing holes 32 of the rotor core 3. Each permanent magnet 5 has a substantially rectangular shape when viewed from the axial direction, and the surface of the long side portion is a magnetic pole surface. Further, the permanent magnet 5 has a rectangular parallelepiped shape in which the axial length is equal to the axial length of the rotor core 3 and is integrally formed. And it arrange | positions so that one magnetic pole may be comprised by a pair of adjacent permanent magnets 5. FIG.

  That is, the pair of permanent magnets 5 arranged with the inner peripheral side end portions 322 close to each other are arranged with the magnetic pole surfaces of the same magnetic pole (N pole or S pole) facing the outer peripheral side. A plurality of pairs of permanent magnets 5 (magnet pairs 50) are arranged in the circumferential direction of the rotor core 3. The plurality of magnet pairs 50 are arranged such that the magnetic poles on the outer peripheral side are alternately N and S poles. The plurality of magnet pairs 50 are arranged circumferentially at equal intervals.

  As shown in FIG. 4, the magnet accommodation hole 32 provided in the rotor core 3 has a communication portion 321 that is open on the outer peripheral side. Thereby, it is possible to prevent the magnetic flux from the permanent magnet 5 from short-circuiting around the permanent magnet 5 in the rotor core 3 (magnetic flux leakage). In particular, in this example, all the magnetic steel plates 30 constituting the rotor core 3 open the magnet housing holes 32 to the outer peripheral side. That is, all the magnetic steel plates 30 are open to the outer peripheral side.

As shown in FIG. 3, end plates 2 are arranged at both axial ends of the rotor core 3.
As shown in FIGS. 3 and 4, the end plate 2 has a substantially disc shape, and the outer diameter thereof is set to be substantially the same as the outer diameter of the magnetic steel plate 30. The end plate 2 is manufactured by press molding a stainless steel plate. On the outer peripheral edge portion 23 of the end plate 2, a standing portion 21 is formed standing up toward the opposite side of the rotor core 3. The standing portion 21 is erected from the entire circumference of the outer peripheral edge portion 23 of the end plate 2 and has an annular shape.

In this example, the outer peripheral edge portion 23 of the end plate 2 coincides with the outer peripheral edge 31 of the rotor core 3. Therefore, the standing portion 21 is in a state of pressing the outer peripheral edge 31 from the axial direction.
Further, the end plate 2 includes a plate shaft hole 24 and a plate fixing hole 25 at positions corresponding to the shaft hole 34 and the fixing hole 33 of the rotor core 3, respectively.

  The pair of end plates 2 and the rotor core 3 are sandwiched from both ends in the axial direction by fastening members 6 penetrating them in the axial direction. In this example, a rivet is used as the fastening member 6. The fastening member 6 includes a pair of heads 61 that engage with the outer main surface 22 on the outer side in the axial direction with respect to the pair of end plates 2. The protruding height of the standing portion 21 with respect to the outer main surface 22 of the end plate 2 is set to be equal to or lower than the protruding height of the head 61 with respect to the outer main surface 22 of the end plate 2.

  The rivet (fastening member 6) penetrates the plurality of magnetic steel plates 30 and the pair of end plates 2 in the stacking direction and is sandwiched from both ends in the stacking direction. That is, the rivet passes through the fixing holes 33 in the plurality of magnetic steel plates 30 and the plate fixing holes 25 in the pair of end plates 2. Then, as shown in FIG. 3, the rivet head 61 is engaged with the outer main surface 22 of one end plate 3, and the tip end portion of the rivet shaft portion 62 is crushed and expanded, so that the other end plate 3 The outer main surface 22 is engaged.

  In this example, a stainless steel plate is used as the material of the end plate 2, but the present invention is not limited to this. However, it is preferable that the material has sufficient permeability to suppress warpage deformation of the magnetic steel plate 30 and has a lower magnetic permeability than the magnetic steel plate 30 in order to prevent leakage of magnetic flux. Further, the end plate 2 can be manufactured by various forming methods other than the press work shown in this example.

Next, the effect of this example is demonstrated.
In the rotor 1 of the permanent magnet type rotating electrical machine 10, the end plate 2 is disposed on the opposite side of the rotor core 3 between the inner peripheral side end 322 of the magnet accommodation hole 32 and the outer peripheral edge 31 of the rotor core 3 in the radial direction. A standing portion 21 is provided so as to stand up. Therefore, it is possible to improve the rigidity of the end plate 2 around the magnet housing hole 32 that is likely to be warped and deformed in the magnetic steel plate 30. . Thereby, even if the outer peripheral side of each magnetic steel plate 30 is warped in the thickness direction, these can be suppressed by the end plate 2 and prevented from spreading in the stacking direction. That is, it is possible to prevent the axial dimension at the outer peripheral portion of the rotor core 3 from increasing.
As a result, it is possible to prevent a reduction in the proportion of the magnetic flux that affects the magnetic poles of the stator 1 out of the magnetic flux emitted from the permanent magnet 5 and to secure a desired output of the permanent magnet type rotating electrical machine 10.

  Further, in order to prevent magnetic flux leakage at the outer peripheral edge 31 of the rotor core 3, when the magnet accommodation hole 32 includes the communication portion 321, the rigidity around the magnet accommodation hole 32 is likely to be lowered, and the magnetic steel plate 30 is further warped and deformed. It becomes easy. As described above, even when the magnet housing hole 32 includes the communication portion 321 by effectively suppressing the warp deformation of the magnetic steel plate 30 using the end plate 2 having excellent strength, the rotor core 3 It is possible to reliably prevent an increase in the axial direction.

  In addition, the end plate 2 is formed with an upright portion 21 in an annular shape along a circumference around the rotation axis. Therefore, since the standing part 21 is continuously formed along the circumference, the rigidity of the end plate 2 can be effectively improved.

  The pair of end plates 2 and the rotor core 3 are sandwiched from both ends in the axial direction by fastening members 6 penetrating them in the axial direction, and the height of the standing portion 21 is the outer main surface 22 of the end plate 2. Is less than or equal to the height of the head 61 relative to. Therefore, the standing portion 21 is arranged at a position inside the axial direction with respect to the head portion 61 of the fixing member 6. Therefore, even if the standing portion 21 is provided, the rotor 1 can be prevented from becoming larger in the axial direction.

  As described above, according to this example, the rotor of the permanent magnet type rotating electrical machine capable of preventing the axial dimension of the outer periphery of the rotor core from expanding and securing a desired output, and the permanent magnet type rotation provided with the rotor. An electric machine can be provided.

(Example 2)
This example is an example in which the shape of the end plate 2 is changed with respect to the rotor 1 shown in the first embodiment.
As shown in FIGS. 6 and 7, the end plate 2 in the rotor 1 of the present example includes a standing portion 21 formed at a position inside the outer peripheral edge portion 23. The standing portion 21 passes through a substantially intermediate position between the inner peripheral side end 322 of the magnet housing hole 32 and the outer peripheral edge 31 of the end plate 2 in the radial direction, and extends along a circumference centering on the rotation center of the rotor 1. It is formed in an annular shape. As shown in FIG. 7, the cross-sectional shape of the upright portion 21 on the plane orthogonal to the circumference is a shape that rises in a mountain shape toward the outside in the axial direction.
Other configurations are the same as those of the first embodiment.
Also in this example, the same effect as Example 1 can be obtained.

(Example 3)
This example is an example of a variation in the shape of the standing portion 21 of the end plate 2.
FIG. 8 shows an example in which the standing portion 21 is erected from the outer peripheral edge portion 23 and is formed in an intermittent annular shape.
FIG. 9 shows an example in which the standing portion 21 is erected from the inner side of the outer peripheral edge portion 23 and is formed in a polygonal (octagonal) shape.
In addition, this example shows an example of the shape of the standing portion 21, and the standing portion 21 can be formed in various shapes other than those described above.
In the above embodiment, an example has been shown in which all the magnetic steel plates constituting the rotor core have communication portions. However, even when a magnetic steel plate having no communication portions is included, the effects of the present invention can be obtained. Can do.

DESCRIPTION OF SYMBOLS 1 Rotor 10 Permanent-magnet-type rotary electric machine 100 Stator 2 End plate 21 Standing part 22 Outer main surface 3 Rotor core 30 Magnetic steel plate 31 Outer peripheral edge 32 Magnet accommodating hole 321 Inner peripheral side end part 5 Permanent magnet

Claims (5)

Rotation of a permanent magnet type rotating electrical machine having a rotor core formed by laminating a plurality of magnetic steel plates, and a plurality of permanent magnets embedded in a plurality of magnet housing holes formed through the rotor core in the axial direction of the rotation shaft A child,
The plurality of magnet accommodation holes are arranged such that a pair of adjacent magnet accommodation holes expand toward the outer peripheral edge,
End plates are respectively disposed at both axial ends of the rotation axis of the rotor core, and the end plates are arranged on the inner peripheral side end of the magnet housing hole and the outer peripheral edge of the rotor core in the radial direction of the rotation shaft. A rotor of a permanent magnet type rotating electrical machine, comprising a standing portion formed between the rotor core and the rotor core.   2. The rotor of the permanent magnet type rotating electrical machine according to claim 1, wherein at least one of the magnetic steel plates includes a communication portion that connects an outer peripheral side end of the magnet accommodation hole and an outer peripheral edge. A permanent magnet type rotating electrical machine.   The rotor of a permanent magnet type rotating electrical machine according to claim 1 or 2, wherein the standing portion is formed in an annular shape along a circumference around the rotation axis. Electric rotor.   The rotor of the permanent magnet type rotating electrical machine according to any one of claims 1 to 3, wherein the pair of end plates and the rotor core are axially connected by a fastening member that passes through them in the axial direction of the rotating shaft. A rotor of a permanent magnet type rotating electrical machine, wherein the rotor is sandwiched from both ends, and a protruding height of the standing portion is equal to or less than a height of a head portion of the fastening member.   A permanent magnet type rotating electrical machine comprising: a rotor of the permanent magnet type rotating electrical machine according to any one of claims 1 to 3; and a stator disposed on an outer periphery of the rotor.

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