JP6591084B2 - Rotor and rotating electric machine - Google Patents

Description

  The present invention relates to an internal rotation type rotating electrical machine and a rotor in which a rotor is arranged on the inner side in the radial direction of a stator, and in particular, prevents leakage magnetic flux in the rotor and prevents scattering of magnets. is there.

  Conventional rotary electric machines have been considered to increase the amount of magnets used for each pole to improve the output of the rotary electric machine. In the case of a structure in which magnets are arranged on the outer peripheral surface of the rotor, the circumferential width of each magnet must be equal to or smaller than “peripheral length of rotor outer periphery ÷ number of poles”. Due to this condition, when the number of poles increases, the width of the magnet tends to be narrowed, which becomes a limitation when the amount of magnets is increased to improve the characteristics of the rotating electrical machine. As a measure for avoiding this, a rotating electrical machine in which magnets are radially incorporated so as to extend in the radial direction from the inner peripheral side to the outer peripheral side in the iron core of the rotor has been proposed (for example, see Patent Document 1).

Japanese Patent No. 5429241 (FIG. 2)

  In the rotating electrical machine, when a leakage magnetic flux is generated in which the magnetic flux generated by the magnet is short-circuited in the rotor, the magnetic flux does not contribute to the torque generation of the rotor at all. Therefore, suppressing the leakage magnetic flux improves the characteristics of the rotating electrical machine. When the outer peripheral surface of the magnets arranged radially is completely covered with the laminated iron core, the magnetic flux is short-circuited there and becomes a leakage magnetic flux in the rotor. Moreover, the fan-shaped laminated iron cores sandwiched between the magnets are connected to each other via a narrow connecting portion on the inner peripheral side. In this structure, it is necessary to connect each of them, but in order to reduce the leakage magnetic flux through the connecting portion, the width of the connecting portion is narrowed to increase the magnetic resistance of the portion.

  In a conventional rotating electric machine, a portion for fixing a magnet is provided on the outer peripheral surface of the magnet in a bowl shape, and the magnet outer peripheral side is not completely covered with the iron core. There is a problem that a magnetic flux becomes a factor of leakage magnetic flux because of the presence of the shaped portion.

  Since the magnet of the rotor is a material that easily breaks due to an impact, it is necessary to take measures to prevent the magnet from being scattered even if a piece of magnet is generated depending on the application of the rotating electrical machine. However, the conventional magnet has a problem in that the outer peripheral side of the rotor is exposed and there is no scattering prevention effect.

  The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a rotor and a rotating electrical machine that prevent leakage magnetic flux in the rotor and prevent scattering of magnets.

The rotor of the present invention is
In the rotor that is arranged inside the stator of the rotating electrical machine and rotates around the rotating shaft,
A laminated iron core in which thin steel cores are laminated;
A first end plate and a second end plate respectively installed at both ends of the laminated core in the axial direction, each having a first through hole and a second through hole through which the rotating shaft passes in the center;
The laminated core has an annular base portion having a through hole through which the rotating shaft passes,
A plurality of magnetic pole portions formed in the circumferential direction at a predetermined interval in the circumferential direction, spaced apart from each other in the radial direction on the outside of the base portion;
It comprises a connecting portion that extends radially outward from the base and connects to each of the magnetic pole portions,
Magnets respectively disposed between circumferential directions of the magnetic pole portions of the laminated core;
A non-magnetic first wedge that covers the outside of each of the magnets in the radial direction;
A non-magnetic second wedge covering the radial inner side of each of the magnets ,
Each of the second wedges has one end in the axial direction formed integrally with the first end plate or the second end plate, and the other end in the axial direction is the other first end plate or the second end plate. It is formed by fitting in the second fitting part formed in the above.
The rotor of the present invention is
In the rotor that is arranged inside the stator of the rotating electrical machine and rotates around the rotating shaft,
A laminated iron core in which thin steel cores are laminated;
A first end plate and a second end plate respectively installed at both ends of the laminated core in the axial direction, each having a first through hole and a second through hole through which the rotating shaft passes in the center;
The laminated core has an annular base portion having a through hole through which the rotating shaft passes,
A plurality of magnetic pole portions formed in the circumferential direction at a predetermined interval in the circumferential direction, spaced apart from each other in the radial direction on the outside of the base portion;
It comprises a connecting portion that extends radially outward from the base and connects to each of the magnetic pole portions,
Magnets respectively disposed between circumferential directions of the magnetic pole portions of the laminated core;
A non-magnetic first wedge that covers the outside of each of the magnets in the radial direction;
The first through hole and the second through hole of the first end plate and the second end plate are formed smaller than the outer diameter of the base portion ,
In the gap formed between the base portion of the laminated core and the magnetic pole portion in the radial direction, one end in the axial direction of the gap portion is at the first end plate, and the axial direction of the gap portion Is sealed with the second end plate .
The rotating electrical machine of the present invention is
A rotor as described above;
The rotor is provided with the stator arranged concentrically with a space from the outer peripheral surface of the rotor.

According to the rotor and the rotating electrical machine of the present invention,
This prevents leakage magnetic flux in the rotor and prevents the magnets from scattering.

It is sectional drawing which shows the structure of the rotary electric machine of Embodiment 1 of this invention. It is a disassembled perspective view which shows the structure of the rotor of the rotary electric machine shown in FIG. It is sectional drawing which shows the structure of the rotor of the rotary electric machine shown in FIG. It is an expanded sectional view which shows the structure of the rotor shown in FIG. It is sectional drawing which shows the structure of the rotor shown in FIG. It is a perspective view which shows the manufacturing method of the rotor shown in FIG. It is a perspective view which shows the manufacturing method of the rotor shown in FIG. It is a perspective view which shows the manufacturing method of the rotor shown in FIG. It is sectional drawing which shows the structure of the other example of the rotor of the rotary electric machine shown in FIG. It is sectional drawing which shows the structure of the stator of the rotary electric machine of Embodiment 2 of this invention. It is sectional drawing which shows the structure of the rotor shown in FIG. It is sectional drawing which shows the structure of the stator of the rotary electric machine of Embodiment 3 of this invention. It is a disassembled perspective view which shows the structure of the rotor shown in FIG. It is sectional drawing which shows the structure of the rotor shown in FIG. It is a disassembled perspective view which shows the structure of the rotor of the rotary electric machine shown in FIG. 1, and another manufacturing method.

Embodiment 1 FIG.
Embodiments of the present invention will be described below. In the following description, directions in the rotating electrical machine 1 according to the embodiment of the present invention are shown as a circumferential direction Z, an axial direction Y, a radial direction X, an outer side X1 in the radial direction X, and an inner side X2 in the radial direction X, respectively. Therefore, the directions of the stator 3 and the rotor 6 are the same.

  FIG. 1 is a cross-sectional view showing a cross section perpendicular to the axial direction Y of the rotary electric machine 1 according to Embodiment 1 of the present invention. FIG. 2 is an exploded perspective view showing the configuration of the rotor 6 of the rotating electrical machine shown in FIG. FIG. 2 shows the configuration of the laminated iron core 7 and the arrangement of the magnets 8. The laminated iron core 7, which will be described later, is configured by stacking thin steel cores 70 in the axial direction Y, and a rectangular parallelepiped. It shows that the magnets 8 are arranged radially and are fitted in the laminated iron core 7.

  3 is a cross-sectional view showing a cross section perpendicular to the axial direction Y of the rotor 6 of the rotating electrical machine 1 shown in FIG. FIG. 4 is an enlarged cross-sectional view showing a portion where the magnet 8 of the rotor 6 shown in FIG. 3 is incorporated. FIG. 5 is a cross-sectional view showing a cross section parallel to the axial direction Y of the rotor 6 along the line A1-A2 shown in FIG. FIG. 15 is an exploded perspective view showing the structure of the rotor of the rotating electrical machine shown in FIG. 1 and another manufacturing method. In each of the drawings, the first end plate 14 and the second end plate 16 to be described later are not shown in the drawings showing a cross section perpendicular to the axial direction Y. Since this is the same in the following embodiments, the description thereof will be omitted as appropriate.

  In the figure, a rotating electrical machine 1 includes a motor frame 2, a cylindrical stator 3 fixed to the inner side X2 of the motor frame 2, and a rotor 6 arranged at a predetermined interval on the inner side X2 of the stator 3. It consists of. The stator 3 is obtained by winding a winding 5 around a stator core 4. An insulating member is disposed between the stator core 4 and the winding 5 to prevent the two from being electrically short-circuited, but is omitted in the figure. The winding 5 is composed of a group of three or more multi-phase windings, and a predetermined current is sequentially applied to the windings 5 of each phase according to the phase of the rotor 6 using an external control device. Then, the rotor 6 is rotated.

  The rotor 6 includes a laminated iron core 7, a magnet 8, and a rotating shaft 9. The rotating shaft 9 is rotatably supported with respect to the stator 3 and the motor frame 2 by a bearing (not shown). The laminated iron core 7 is formed by laminating a plurality of thin iron cores 70 in the axial direction Y, for example. The laminated iron cores 70 are generally fixed by, for example, caulking the iron cores 70 adjacent to each other in the axial direction Y, but a fixing method in which the iron cores 70 are welded or bonded with an adhesive is also applied. Is possible.

  The stator core 4 is also generally constructed by laminating thin iron cores in the same manner as the laminated core 7. However, the stator core 4 is provided with an insulating coating on the surface of the iron core used for the stator core 4. The iron cores are electrically insulated, thereby making it difficult for eddy currents to occur in the stator core 4 and reducing losses due to eddy currents. Further, the core 70 used for the laminated core 7 may be the same as the core of the stator core 4, but the core 70 provided with an insulating coating may be used. However, in the case of the laminated core 7, an iron core 70 without an insulating coating may be used. Good.

  The laminated iron core 7 includes a base portion 11, a plurality of magnetic pole portions 12, and a plurality of connecting portions 10. The base 11 has a through hole 30 through which the rotary shaft 9 passes and is formed in an annular shape. The rotating shaft 9 is fixed to the through hole 30 of the base 11. Since the rotational torque generated in the rotor 6 is output to the outside through the rotational shaft 9, the base 11 and the rotational shaft 9 are firmly fixed so as to withstand the rotational torque. As a fixing method, a configuration in which a key for press-fitting, welding, or rotation prevention is incorporated is conceivable.

  The magnetic pole portion 12 is formed on the outer side X1 of the base portion 11 in the radial direction X with a gap W1, and a plurality of, in this case, 14 pieces are formed in the circumferential direction Z with a predetermined gap W2 in the circumferential direction Z. The The connecting portion 10 extends from the base portion 11 to the outer side X1 in the radial direction X and connects each magnetic pole portion 12 to each other. Accordingly, the same 14 connecting portions 10 as the magnetic pole portions 12 are formed. The circumferential width Z of the connecting portion 10 is smaller than the circumferential width Z of the magnetic pole portion 12. As a result, a gap 40 is formed between the radial direction X between the base 11 and the magnetic pole 12 of the laminated iron core 7.

  Magnets 8 are disposed between the circumferential directions Z of the magnetic pole portions 12 of the laminated core 7. Therefore, 14 magnets 8 are arranged here. The magnet 8 is formed in a substantially rectangular parallelepiped. The magnet 8 is installed in the radial direction X of the rotor 6 so as to extend in the radial direction X from the inner side X2 to the outer side X1. The magnetic poles of adjacent magnets 8 are formed in opposite directions, and the magnetic pole portion 12 of the laminated iron core 7 sandwiched between them functions as the magnetic pole of the rotor 6.

  The reason why the magnet 8 of the rotating electrical machine 1 in the first embodiment is formed in a substantially rectangular parallelepiped will be described. A sintered magnet having a high magnetic flux density is used for the magnet 8 of the rotating electrical machine 1. A sintered magnet formed by baking and solidifying magnet powder has a large dimensional change in the sintering process, and therefore a polishing process after sintering is required to obtain a desired magnet shape accuracy. At that time, a simple shape can be finished with a small amount of polishing, and the polishing time is shortened. Therefore, a rectangular parallelepiped is used for finishing at the lowest cost among the magnets 8 of the same volume.

  The first end plate 14 and the second end plate 16 are installed in close contact with both ends in the axial direction Y of the laminated core 7. The first end plate 14 and the second end plate 16 are formed with a first through hole 31 and a second through hole 32 through which the rotary shaft 9 passes, respectively. The first wedge 13 is formed so as to cover all the upper and lower sides in the axial direction Y on the outer side X1 of the radial direction X of each magnet 8. The second wedge 15 is formed so as to cover all the upper and lower sides in the axial direction Y on the inner side X <b> 2 of the radial direction X of each magnet 8. The first wedge 13 and the second wedge 15 are formed of a nonmagnetic material, for example, a resin or an aluminum alloy. The first wedge 13 is formed integrally with the first end plate 14 at one end in the axial direction Y. One end of the second wedge 15 in the axial direction Y is integrally formed with the second end plate 16.

  The first end plate 14 is formed with a second fitting portion 19 for fitting the second wedge 15 into the first through hole 31 that is the inner side X2 in the radial direction X. A first fitting portion 17 for fitting the first wedge 13 to the outer side X1 in the radial direction X is formed on the second end plate 16. The magnetic pole part 12 is formed with a first fitting groove 18 extending in the axial direction Y on the side of the magnetic pole part 12 adjacent to the circumferential direction Z (FIG. 4). The magnetic pole portion 12 is formed with a second fitting groove 20 extending in the axial direction Y on the inner side X2 in the radial direction X (FIG. 4). The first wedge 13 is inserted into the first fitting groove 18 of the magnetic pole part 12 and connects the magnetic pole parts 12 adjacent to each other in the circumferential direction Z. The second wedge 15 is inserted into the second fitting groove 20 of the magnetic pole part 12 and connects the magnetic pole parts 12 adjacent to each other in the circumferential direction Z.

  The first wedge 13 is fitted to the first fitting portion 17 of the second end plate 16 on the second end plate 16 side in the axial direction Y. The second wedge 15 is fitted to the second fitting portion 19 of the first end plate 14 at the first end plate 14 side in the axial direction Y. This is because the length of the first wedge 13 and the second wedge 15 in the axial direction Y is longer than the length of the laminated iron core 7 in the axial direction Y. Therefore, the first wedge 13 and the second wedge 15 incorporated in the laminated core 7 pass through the laminated core 7 at the end portions that are not formed integrally with the first end plate 14 and the second end plate 16. Projecting outward in the axial direction Y. A second fitting portion 19 and a first fitting portion 17 are formed on the first end plate 14 and the second end plate 16 at the protruding position. Therefore, the end portions of the first wedge 13 and the second wedge 15 projecting outward from the laminated core 7 in the axial direction Y are the first fitting portion 17 and the second fitting portion of the second end plate 16 and the first end plate 14. It is inserted into the part 19.

  A method of integrally forming the first wedge 13 and the second wedge 15, and the first end plate 14 and the second end plate 16 will be described. In the case of using aluminum, for example, it is performed by a method of integrally forming by die casting. In addition, the first wedge 13 and the second wedge 15 are formed by extrusion molding, fitted into the first end plate 14 and the second end plate 16, and fixed by welding or caulking to be integrally formed. Do it. When forming by die casting, an aluminum alloy for die casting having excellent castability is used. In the case of extrusion molding, an aluminum alloy suitable for extrusion processing is used.

  Further, it is conceivable to use a resin other than the aluminum alloy as the material of the first wedge 13 and the second wedge 15, but there is a concern of creep when the resin is used. However, in this embodiment, since the load hardly acts on the first wedge 13, the second wedge 15, the first end plate 14 and the second end plate 16 at normal times, it is considered that there is no problem with creep. This is a state in which the magnet 8 is sandwiched between the magnetic pole portions 12 of the laminated core 7 on both sides in the circumferential direction Z. Usually, the rotor 8 rotates because the magnet 8 and the laminated core 7 are adsorbed. This is because the centrifugal force due to this does not normally act on the first wedge 13, the second wedge 15, the first end plate 14 and the second end plate 16.

  It is conceivable that an external force acts on the rotor 6 to cause a centrifugal force or the like exceeding the attracting force to act on the magnet 8, but the frequency is slight and it is not considered to be a degree that leads to deformation of the first wedge 13. It is done. Accordingly, the resin material is not particularly limited, but the first wedge 13 supports the centrifugal force acting on the magnet 8 when the rotor 6 is rotated by an external force in an irregular state as described above. In view of the above, it is desirable to use a resin material having a relatively high strength. For example, a resin material having relatively high strength such as PA (polyamide, polyamide), PBT (polybutylene terephthalate), PET (polyethylene terephthalate), or the like is suitable.

  As described above, in the first embodiment, each magnetic pole portion 12 of the laminated core 7 of the rotor 6 is connected to the base portion 11 by the connecting portion 10. Therefore, the centrifugal force generated in each magnetic pole part 12 when the rotor 6 rotates is supported by the connecting part 10 provided in each magnetic pole part 12. Therefore, since only the centrifugal force acting on the magnet 8 acts on the first wedge 13, if the first wedge 13 is made of the resin material described above, the magnet 8 is held by the first wedge 13. It is possible enough.

  Next, a method for manufacturing the rotor of the rotating electrical machine of the first embodiment configured as described above will be described with reference to FIGS. As a manufacturing method, the first wedge 13, the second wedge 15 and the magnet 8 are incorporated into the laminated iron core 7. First, as a first step, the first wedge 13 or the second wedge 15 is incorporated into the laminated iron core 7 from one side in the axial direction Y. As a second step, the magnet 8 is fitted. As the third step, the other first wedge 13 or second wedge 15 is incorporated.

  In the first step, either the first wedge 13 or the second wedge 15 can be assembled. However, a method of holding the magnet 8 from the outer side X1 in the second step is desirable, and the second wedge 15 is integrally formed in the first step so that the magnet 8 can be held from the outer side X1 of the rotor 6. The second end plate 16 is placed so that the second wedge 15 faces upward (FIG. 6), and the laminated iron core 7 is assembled with the second wedge 15 from above in the axial direction Y (FIG. 7). At this time, the second wedge 15 is inserted into the second fitting groove 20 formed in the magnetic pole portion 12 and fitted.

  Next, the magnet 8 is incorporated into the laminated core 7 from the axial direction Y opposite to the second end plate 16 integrated with the second wedge 15 incorporated in the first step (FIG. 8). Alternatively, the magnet 8 may be incorporated in the laminated iron core 7 by moving the magnet 8 in the radial direction X from the outer side X1 toward the inner side X2. Next, the first end plate 14 in which the first wedge 13 is integrally formed is arranged so that the first wedge 13 faces downward, and is assembled into the laminated iron core 7 from the axial direction Y. At this time, the first wedge 13 is inserted and fitted into the first fitting groove 18 formed in the magnetic pole portion 12. At the same time, in the axial direction Y of the first wedge 13 and the second wedge 15, the end on the side not integrally formed with the first end plate 14 and the second end plate 16 is connected to the first end plate 16. The fitting portion 17 and the second fitting portion 19 of the first end plate 14 are respectively fitted.

  In order to use it as the rotor 6, a magnetizing step for applying a strong magnetic field to the magnet 8 to magnetize it is essential. In the rotor 6 of the present embodiment, a method may be used in which the rotor 6 is assembled using a magnet 8 that is not magnetized and magnetized immediately before the rotor 6 is incorporated into the rotating electrical machine 1. A method may be used in which each magnet 8 is magnetized and incorporated in the laminated core 7.

  However, when the magnet 8 is radially incorporated into the rotor 6 as in the first embodiment, sufficient magnetic flux does not flow in the inner side X2 of the magnet 8 in the radial direction X even when a magnetic field is applied from the outside. The magnetization of the inner side X2 in the radial direction X of the magnet 8 may be insufficient. Therefore, a method of incorporating the magnet 8 that has been magnetized first into the laminated iron core 7 is often employed.

  Further, as described above, the rotor 6 of the first embodiment needs to incorporate a plurality of magnets 8 in the laminated core 7. Therefore, in order to shorten the time required for incorporating the plurality of magnets 8 and improve productivity, it is desirable to incorporate the plurality of magnets 8 into the laminated core 7 at the same time. As a method of simultaneously incorporating the magnet 8 between the magnetic pole portions 12 of the laminated iron core 7, a method of incorporating the magnet 8 from the axial direction Y of the rotor 6 or a magnet 8 from the outer side X1 of the rotor 6 in the radial direction X to the inner side X2. Two methods of incorporation are possible: a method of incorporating towards.

  As shown in FIG. 8 of the first embodiment, in the method of incorporating a plurality of magnets 8 simultaneously from the axial direction Y of the rotor 6, within the range of the axial direction Y of the size of the laminated core 7. Thus, a facility for simultaneously gripping the plurality of magnets 8 is required. However, there is no room for gripping the plurality of magnets 8 within a narrow range of the size of the laminated iron core 7 in the axial direction Y, and the equipment configuration is complicated. This is particularly noticeable in the small rotating electrical machine 1 because the size of the laminated iron core 7 is small. Moreover, it is necessary to produce a large number of small rotating electrical machines 1 at a low cost, which is disadvantageous from the viewpoint of productivity.

  Therefore, the configuration of the facility for incorporating the magnet 8 becomes simple, and in order to achieve both improvement in productivity by incorporating a plurality of magnets 8 at the same time, a plurality of portions are provided at a place where there is room on the outer side X1 of the rotor 6 in the radial direction X. It is conceivable that a facility for holding the magnet 8 is installed and the magnet 8 is incorporated from the outer side X1 in the radial direction X to the inner side X2 of the laminated core 7.

  A method of incorporating the magnet 8 from the outer side X1 in the radial direction X of the laminated core 7 to the inner side X2 will be described with reference to FIG. First, as in the first embodiment, the second wedge 15 is inserted and fitted in the axial direction Y between the magnetic pole portions 12 of the laminated core 7 (FIG. 7). Next, as shown in FIG. 15, the magnets 8 arranged radially on the outer side X <b> 1 in the radial direction X of the laminated core 7 are moved between the magnetic pole portions 12 of the laminated core 7 from the outer side X <b> 1 in the radial direction X toward the inner side X <b> 2. Insert. Next, as in the first embodiment, the first wedge 13 of the laminated core 7 is inserted and fitted in the axial direction Y, and the rotor 6 is configured as shown in FIG.

  In addition, in the case of the method and the method of incorporating the magnet 8 from the outer side X1 of the laminated core 7 in the radial direction X to the magnetic pole part 12, it is natural that the gap between the magnetic pole parts 12 is the width in the circumferential direction Z of the magnet 8. In addition to being formed as described above, each magnetic pole part 12 has a configuration that penetrates to the outer side X1 of the laminated core 7 in the radial direction X.

  In the case of a conventional rotating electric machine, the magnetic pole portions sandwiched between the magnets are connected only through thin connecting portions, and therefore the strength of the laminated iron core is weak. For this reason, end plates are disposed at both ends of the laminated core in the axial direction, and fixing of both end plates and securing of strength of the laminated core are achieved by a bar penetrating the laminated core. For this purpose, it is necessary to provide a hole through which the bar passes in the laminated iron core, which increases the magnetic resistance and deteriorates the characteristics of the rotating electrical machine. However, in the first embodiment, the first wedge 13 and the second wedge 15 connect the magnetic pole portions 12 adjacent to each other in the circumferential direction Z, so that the rigidity as the rotor 6 is improved.

  According to the rotor and the rotating electrical machine of Embodiment 1 configured as described above, the outer side and the inner side in the radial direction of the magnet are covered with the first wedge and the second wedge, and the magnet is held. The number of contact portions between the magnet and the laminated core decreases, and the magnet can be held while reducing the leakage magnetic flux generated in the laminated core. Therefore, it is possible to improve the characteristics or reduce the size of the rotating electrical machine. In addition, since the first wedge and the second wedge cover all the upper and lower sides in the axial direction inside and outside the magnet in the radial direction, it is possible to prevent malfunction of the rotating electrical machine due to scattering of magnet pieces.

  Further, in the structure in which magnets are embedded in the laminated iron core so as to extend in the radial direction X from the inner side X2 to the outer side X1 as in the first embodiment, the amount of magnets per pole is increased to improve the characteristics of the rotating electrical machine. Can be planned. As another method of arranging magnets, there is a method of arranging and fixing magnets in the circumferential direction of the laminated iron core. In this case, the circumferential width of each magnet is made larger than “peripheral length of laminated iron core ÷ number of poles”. I can't. Therefore, particularly in a rotor with a large number of poles, it is necessary to increase the axial length in order to increase the amount of magnets, which increases the axial length of the rotating electrical machine. On the other hand, in the magnet arrangement according to the first embodiment, the magnet width is limited by the radius of the laminated core, so that even when the number of poles is large, it is possible to increase the magnet amount by increasing the magnet width. The output can be increased without increasing the direction length.

  Further, in the first embodiment, in order to reduce the number of components and facilitate positioning of the laminated core when the magnet is assembled, the inside of the magnetic pole part and the base part arranged on the inside are connected by a connecting part. ing. However, in order to reduce the leakage magnetic flux that passes through the connecting portion, the connecting portion is configured to be elongated, and as a result, the circumferential rigidity of each magnetic pole portion may be lowered. If the rigidity in the circumferential direction is low, each magnetic pole portion is displaced in the circumferential direction when the rotating electrical machine is driven, which causes generation of vibration and sound. By placing the first and second wedges between the magnetic poles adjacent to each other in the circumferential direction and connecting them together, they are not connected magnetically but are mechanically connected. Can be increased.

  In the first embodiment, one end of the first wedge and the second wedge in the axial direction is integrally formed with the first end plate or the second end plate. Since the end is fitted with the second fitting portion or the first fitting portion of the other first end plate or the second end plate, deformation in the rotation direction of the first wedge and the second wedge can also be suppressed.

  In the rotor in which magnets are arranged radially in the first embodiment, it is common to use a sintered magnet having a high magnetic flux density. A sintered magnet is a fragile material, and cracks and chips may occur in the magnet when an impact force or the like is applied. If the magnet pieces are scattered, the rotor may be unable to rotate if it is caught between the stator and the rotor. Further, the broken pieces may cause dielectric breakdown of the stator windings and the like.

  For this reason, in applications where high reliability is required in spite of harsh usage environments such as temperature and vibration, for example, in-car applications for automobiles, it is necessary to take measures to prevent the rotating electric machine from moving into a stationary state due to scattering of magnet fragments. There is. In the laminated iron core, the connecting portion is elongated to reduce the leakage magnetic flux, and it is necessary to use a thin plate to process the shape with a press which is a processing method suitable for mass production. Therefore, the laminated iron core is formed by laminating thin iron cores. Thereby, the laminated iron core provided with the elongate connection part which enlarged magnetic resistance and reduced the leakage magnetic flux can be obtained.

  However, since variations in the thickness of the thin iron cores constituting the laminated core are unavoidable, variations in the height of the entire laminated core in which the laminated cores are laminated also occur. Although it is possible to adjust the height by adjusting the number of stacked layers, it can only be adjusted in units of the thickness of the thin steel core, so the axial height of the entire stack cannot be avoided.

  In the present embodiment, axial ends of the first wedge and the second wedge disposed in the vicinity of the radially outer side and the inner side of each magnet are integrated with the first end plate or the second end plate, and the first Since the end plate and the second end plate are attached in close contact with the axial end of the laminated iron core, there is no gap in which the magnet pieces are scattered outside the rotor. The other end of the first wedge and the second wedge in the axial direction is fitted into the second fitting portion or the second fitting portion of the opposite first end plate or second end plate, and this end plate Since it is attached in close contact with the laminated end of the laminated iron core, there is no gap where the fragments are scattered in this part as well.

  In this way, by integrating one end of the first wedge and the second wedge in the axial direction with the first end plate or the second end plate, the gap in the corresponding portion is eliminated, and the axial direction of the first wedge and the second wedge The other end of the magnet is fitted with the other first end plate or the second end plate, so that even if the axial height of the entire laminated iron core varies, no gap is generated at that location. It is possible to prevent scattering.

  In the first embodiment, the end plate and the wedge are formed from the same material, the first end plate 14 is formed integrally with the first wedge 13, and the second end plate 16 is formed integrally with the second wedge 15. However, the present invention is not limited to this, and the first end plate 14 or the second end plate 16 is formed in a configuration in which both the first wedge 13 and the second wedge 15 are integrated. It is also possible. The first wedge 13 and the second wedge 15 may be formed integrally with either the first end plate 14 or the second end plate 16.

  In addition, when the first wedge 13 and the second wedge 15 are fitted into the laminated core 7, the first end plate 14 and the second end plate 16 that are integrated by being press-fitted are also fixed. However, when the fixing force of the first end plate 14 and the second end plate 16 is insufficient by this alone, the first end plate 14 and the second end plate 16 are bonded to the laminated iron core 7 with an adhesive, or a screw It is also possible to use a configuration such as fixing with. Further, as shown in FIG. 9, the first through hole 310 and the second through hole 320 of the first end plate 14 and the second end plate 16 are reduced in size to the size of the rotary shaft 9, It is also possible to press fit and fix.

Embodiment 2. FIG.
FIG. 10 is a cross-sectional view showing a cross section perpendicular to the axial direction Y of the rotor 6 according to Embodiment 2 of the present invention. 11 is a cross-sectional view showing a cross section of the rotor 6 shown in FIG. 10 parallel to the axial direction Y along the line B1-B2. In the figure, the same parts as those in the first embodiment are denoted by the same reference numerals, and the description thereof is omitted. Only parts different from those in the first embodiment will be described. The second wedge 150 is formed integrally with the first end plate 14. The second wedge 151 is formed integrally with the second end plate 16.

  The length of the second wedges 150 and 151 in the axial direction Y is shorter than the length of the laminated iron core 7 in the axial direction Y, that is, the length of the magnet 8 in the axial direction Y, and the length of one iron core 70 in the axial direction Y. It is formed longer than (thickness). Therefore, only a part of the inner side X <b> 2 in the radial direction X of the magnet 8 is covered with the second wedges 150 and 151.

  The diameters of the first through hole 310 of the first end plate 14 and the second through hole 320 of the second end plate 16 are formed to have the same size as the diameter of the through hole 30 of the laminated core 7. Accordingly, the first through hole 310 and the second through hole 320 are formed smaller than the outer diameter of the base 11 of the laminated core 7.

  In the rotor of the rotating electrical machine according to the second embodiment configured as described above, the first wedge 13 acts as in the first embodiment, and the inner side X2 of the magnet 8 is pivoted by the second wedges 150 and 151. A part is held above and below the direction Y, and the magnet 8 is formed so as not to move to the inside X2. That is, the second wedge 15 functions as positioning of the magnet 8 in the radial direction X.

  Moreover, since the diameter of the 1st through-hole 310 and the 2nd through-hole 320 of the 1st end plate 14 and the 2nd end plate 16 is formed smaller than the external shape of the base 11, the 1st end plate 14 and the 2nd end The inner X2 portion of the plate 16 overlaps the base portion 11 in the axial direction Y. Therefore, the gap 40 of the laminated core 7 where the inner side X2 of the magnet 8 is exposed is in a state of being covered with the first end plate 14 and the second end plate 16 in the axial direction Y. It can be prevented from scattering.

  According to the rotor of the rotating electrical machine of the second embodiment configured as described above, the same effect as that of the first embodiment is obtained, and the second wedge is not fitted to the magnetic pole portion, and the axial direction Therefore, it is easy to incorporate the second wedge into the laminated core. Further, the accuracy of the positional relationship between the second wedge and the magnetic pole portion is relaxed.

  In the second embodiment, the example in which the second wedges 150 and 151 are formed on each of the first end plate 14 and the second end plate 16 has been described. However, the present invention is not limited to this. When the length of the child 6 in the axial direction Y is short, the second wedge 150 or 151 can be formed only on one of the first end plate 14 and the second end plate 16.

Embodiment 3 FIG.
FIG. 12 is a cross-sectional view showing a cross section perpendicular to the axial direction Y of the rotor 6 according to Embodiment 3 of the present invention. FIG. 13 is an exploded perspective view showing the configuration of the rotor 6 shown in FIG. 14 is a cross-sectional view showing a cross section of the rotor 6 shown in FIG. 12 parallel to the axial direction Y along the line C1-C2. In the figure, the same parts as those in the above embodiments are denoted by the same reference numerals, and the description thereof will be omitted. Only parts different from those in the above embodiments will be described.

  In the present third embodiment, as in the second embodiment, the diameters of the first through hole 310 of the first end plate 14 and the second through hole 320 of the second end plate 16 are the same as the through holes of the laminated iron core 7. It is formed with the same size as the diameter of 30. Accordingly, the first through hole 310 and the second through hole 320 are formed smaller than the outer diameter of the base 11 of the laminated core 7. And the 2nd wedge is not formed. Moreover, the magnetic pole part 12 and the magnet 8 of the laminated iron core 7 are fixed with an adhesive.

  Thus, fixing the laminated core 7 and the magnet 8 with an adhesive is a normal method. However, the fixation with the adhesive is easily affected by the surface condition of the object to be bonded, and the degree of adhesion between the opposing surfaces of the magnetic pole portion 12 and the magnet 8 of the laminated iron core 7 is confirmed. Is difficult. For this reason, even if there is a variation in the surface state and the bonding area, an adhesive having a high adhesive strength is used so that sufficient adhesive strength can be obtained with respect to the required fixing force of the magnet 8, or the adhesive surface is increased. Measures are taken. In this case, there are disadvantages in product cost such as an increase in the cost of the adhesive and the time required to apply the adhesive.

  A large force acts in the direction of the outer side X1 of the magnet 8 by centrifugal force when the rotor 6 rotates at a high speed, but the force acting on the inner side X2 is not large. In the third embodiment, the first wedge 13 is incorporated on the outer side X1 of the magnet 8, and the centrifugal force can be supported by the first wedge 13 in addition to the adhesive force of the adhesive. As a result, the magnet 8 needs to be held only by the adhesive only in the direction of the inner side X2 of the magnet 8, and the required value of the adhesive force can be lowered. This makes it possible to reduce the adhesive force by using an inexpensive adhesive or reducing the adhesion area.

  According to the rotor of the third embodiment configured as described above, the same effects as those of the above-described embodiments can be obtained, and the rotor and the rotating electrical machine can be manufactured at low cost.

  It should be noted that the present invention can be freely combined with each other within the scope of the invention, and each embodiment can be appropriately modified or omitted.

  DESCRIPTION OF SYMBOLS 1 Rotating electrical machine, 2 Motor frame, 3 Stator, 4 Stator core, 5 Winding, 6 Rotor, 7 Laminated core, 8 Magnet, 9 Rotating shaft, 10 Connection part, 11 Base part, 12 Magnetic pole part, 13 1st Wedge, 14 First end plate, 15 Second wedge, 16 Second end plate, 17 First fitting portion, 18 First fitting groove, 19 Second fitting portion, 20 Second fitting groove, 30 Through hole , 31 1st through-hole, 32 2nd through-hole, 40 gap part, 70 iron core, 150 2nd wedge, 151 2nd wedge, 310 1st through-hole, 320 2nd through-hole, X radial direction, X1 outside, X2 Inside, Y axis direction, Z circumferential direction.

Claims (9)

In the rotor that is arranged inside the stator of the rotating electrical machine and rotates around the rotating shaft,
A laminated iron core in which thin steel cores are laminated;
A first end plate and a second end plate respectively installed at both ends of the laminated core in the axial direction, each having a first through hole and a second through hole through which the rotating shaft passes in the center;
The laminated core has an annular base portion having a through hole through which the rotating shaft passes,
A plurality of magnetic pole portions formed in the circumferential direction at a predetermined interval in the circumferential direction, spaced apart from each other in the radial direction on the outside of the base portion;
It comprises a connecting portion that extends radially outward from the base and connects to each of the magnetic pole portions,
Magnets respectively disposed between circumferential directions of the magnetic pole portions of the laminated core;
A non-magnetic first wedge that covers the outside of each of the magnets in the radial direction;
A non-magnetic second wedge covering the radial inner side of each of the magnets ,
Each of the second wedges has one end in the axial direction formed integrally with the first end plate or the second end plate, and the other end in the axial direction is the other first end plate or the second end plate. second fitting portion fitted to the formed round rotor formed. Each said 2nd wedge fits in the 2nd fitting groove formed in the said magnetic pole part adjacent to the circumferential direction of the said 2nd wedge, and the said magnetic pole parts adjacent to the circumferential direction are mutually connected by the said 2nd wedge. The rotor according to claim 1 to be coupled. The first through hole and the second through hole of the first end plate and the second end plate are formed smaller than the outer diameter of the base portion ,
In the gap formed between the base portion of the laminated core and the magnetic pole portion in the radial direction, one end in the axial direction of the gap portion is at the first end plate, and the axial direction of the gap portion the rotor of claim 1 or claim 2 of the other end sealing at the second end plate. In the rotor that is arranged inside the stator of the rotating electrical machine and rotates around the rotating shaft,
A laminated iron core in which thin steel cores are laminated;
A first end plate and a second end plate respectively installed at both ends of the laminated core in the axial direction, each having a first through hole and a second through hole through which the rotating shaft passes in the center;
The laminated core has an annular base portion having a through hole through which the rotating shaft passes,
A plurality of magnetic pole portions formed in the circumferential direction at a predetermined interval in the circumferential direction, spaced apart from each other in the radial direction on the outside of the base portion;
It comprises a connecting portion that extends radially outward from the base and connects to each of the magnetic pole portions,
Magnets respectively disposed between circumferential directions of the magnetic pole portions of the laminated core;
A non-magnetic first wedge that covers the outside of each of the magnets in the radial direction;
The first through hole and the second through hole of the first end plate and the second end plate are formed smaller than the outer diameter of the base portion ,
In the gap formed between the base portion of the laminated core and the magnetic pole portion in the radial direction, one end in the axial direction of the gap portion is at the first end plate, and the axial direction of the gap portion The other end of the rotor is sealed with the second end plate . The rotor according to any one of claims 1 to 4 , wherein the first wedge covers all of the upper and lower sides in the axial direction on the outer side in the radial direction of each of the magnets. Each of the first wedges has one end in the axial direction formed integrally with the first end plate or the second end plate, and the other end in the axial direction is the other one of the first end plate or the second end plate. The rotor according to any one of claims 1 to 5 , wherein the rotor is formed by being fitted to a first fitting portion formed in the above. Each said 1st wedge fits into the 1st fitting groove formed in the said magnetic pole part adjacent to the circumferential direction of the said 1st wedge, and the said magnetic pole parts adjacent to the circumferential direction are in the said 1st wedge. The rotor according to any one of claims 1 to 6 , wherein the rotor is connected. The rotor according to any one of claims 1 to 7 , wherein the magnetic pole portion and the magnet of the laminated core are fixed with an adhesive. The rotor according to any one of claims 1 to 8 ,
A rotating electrical machine comprising: the stator disposed concentrically with an interval from an outer peripheral surface of the rotor.

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