JP2024005669A - Rotor core and rotary electric machine - Google Patents

Abstract

To provide a rotor core and a rotary electric machine which can reduce the weight in a magnetic hole part, and can reduce stress acting on the vicinity of an outside flux barrier part of the magnetic hole part by centrifugal force.SOLUTION: A rotor core 1 includes a laminated core 10, and a plurality of permanent magnets 11 constituting a plurality of magnetic poles M. The laminated core 10 has outside flux barrier parts F1 which are separated from an outer peripheral surface 10a of the laminated core 10 through a bridge part 10b and are provided in the vicinity of the outer peripheral surface 10a, and inside flux barrier parts F2 which are provided radial inside of the laminated core 10 opposite to the outside flux barrier parts F1. The laminated core includes a plurality of magnetic hole parts 12, 13 to which the permanent magnets 11 are inserted. All the inside flux barrier parts F2 of the plurality of magnet hole parts are formed of hollow parts F20, and at all the outside flux barrier parts F1 of the plurality of magnet hole parts, resin parts F10 formed of a resin are arranged.SELECTED DRAWING: Figure 2

Description

The present invention relates to a rotor core and a rotating electric machine.

Conventionally, a rotor core including a laminated core into which permanent magnets are inserted is known (for example, see Patent Document 1).

The rotor core described in Patent Document 1 includes a slit into which a magnet is inserted. The slit is formed in an arc shape when viewed from the axial direction of the rotor core, and both ends thereof are arranged near the annular outer peripheral surface of the rotor core. Both ends of the slit are arranged at the same position in the radial direction of the rotor core. A magnet is inserted into the center of the slit, and resin is placed at both ends of the slit to function as a flux barrier.

Patent No. 6214876

Although not specified in Patent Document 1, in the radial direction of the rotor core, the slit includes a slit in which the flux barrier at one end of the slit into which the magnet is inserted is arranged radially inward than the flux barrier at the other end. Rotor cores are conventionally known. When the rotor core described in Patent Document 1 is applied to such a conventional configuration, the resin disposed in the radially inner flux barrier and the resin disposed in the radially outer flux barrier cause the inside of the slit to be There is a problem in that the weight of the rotor core increases, and a relatively large stress is applied in the vicinity of the flux barrier on the radially outer side of the slit due to the centrifugal force acting on the rotor core, which has increased in weight. Note that if a relatively large stress acts near the flux barrier on the radially outer side of the slit, a relatively large circumferential stress will act on the bridge portion on the outer peripheral side adjacent to the flux barrier on the radially outer side of the slit. This is not desirable.

This invention was made to solve the above-mentioned problems, and one object of the invention is to reduce the weight inside the magnet hole and to reduce the weight inside the magnet hole by centrifugal force. It is an object of the present invention to provide a rotor core and a rotating electric machine that can reduce stress acting near an outer flux barrier part.

In order to achieve the above object, a rotor core according to a first aspect of the present invention includes an annular laminated core formed by laminating a plurality of electromagnetic steel plates, and a plurality of magnetic poles forming a plurality of circumferentially provided magnetic poles. and a permanent magnet, the laminated core is separated from the outer circumferential surface of the laminated core via the bridge portion, and includes an outer flux barrier section provided near the outer circumferential surface, and a laminated core on the opposite side of the outer flux barrier section. an inner flux barrier part provided on the radially inner side of the magnet hole, and includes a plurality of magnet holes into which permanent magnets are inserted, and all inner flux barrier parts of the plurality of magnet holes are formed by hollow parts. A resin part made of resin is arranged in all the outer flux barrier parts of the plurality of magnet holes.

In the rotor core according to the first aspect of the invention, as described above, all the inner flux barrier parts of the plurality of magnet holes provided on the radially inner side of the laminated core on the opposite side from the outer flux barrier part are arranged in the hollow part. A resin portion made of resin is disposed in all the outer flux barrier portions of the plurality of magnet holes provided near the outer peripheral surface of the laminated core. As a result, the weight inside the magnet hole (rotor core) can be reduced by not arranging the resin part in the inner flux barrier part, compared to the case where resin parts are arranged in the flux barrier parts at both ends of the magnet hole part. can. For this reason, compared to the case where resin parts are placed in the flux barrier parts at both ends of the magnet hole, the weight inside the magnet hole is reduced.The centrifugal force acting on the rotor core causes the area near the flux barrier part outside the magnet hole to be It is possible to reduce the stress acting on the Further, the outer flux barrier section in which the resin section is arranged can absorb and relieve the centrifugal force acting on the permanent magnet. This also makes it possible to reduce stress acting near the outer flux barrier section of the magnet hole section due to centrifugal force. As a result of the above, it is possible to reduce the weight inside the magnet hole, and it is also possible to reduce stress acting near the outer flux barrier portion of the magnet hole due to centrifugal force. Further, since it is not necessary to arrange a resin part in the inner flux barrier part and the amount of resin part used can be reduced, the manufacturing cost of the rotor core can be reduced.

In the rotor core according to the first aspect, preferably, the resin portion disposed in the outer flux barrier portion is also disposed between the laminated electromagnetic steel sheets.

With this configuration, the strength of the laminated core can be increased by increasing the adhesion between the laminated electromagnetic steel plates in the lamination direction (axial direction) by the resin portion.

In the rotor core according to the first aspect, preferably, a resin portion is disposed in the outer flux barrier portion over the entire area from one end to the other end in the axial direction of the laminated core.

With this configuration, compared to the case where the resin part is arranged only in a part of the axial direction of the laminated core, the stress acting on the outer flux barrier part of the magnet hole part due to centrifugal force can be effectively reduced. can do. Moreover, the strength of the laminated core can be increased by the resin portion disposed over the entire area from one end to the other end in the axial direction of the laminated core.

The rotor core according to the first aspect preferably further includes a cooling fluid passage that is connected to the inner flux barrier section formed by the hollow section and allows cooling fluid to flow through the inner flux barrier section.

With this configuration, the cooling fluid can flow into the inner flux barrier section through the cooling fluid passage, so the rotor core can be effectively cooled. Therefore, the inner flux barrier part formed by the hollow part can reduce the weight inside the magnet hole, reduce the stress acting near the outer flux barrier part of the magnet hole due to centrifugal force, and reduce the inner flux. The rotor core can be effectively cooled using the barrier section.

In this case, preferably, the cooling fluid passage includes a shaft-side cooling fluid supply passage that is provided on a shaft that is inserted into the laminated core and rotates together with the laminated core, and that allows the cooling fluid to be supplied to the inner flux barrier section to flow therethrough.

With this configuration, the cooling fluid can easily flow into the inner flux barrier section via the shaft-side cooling fluid supply path provided in the shaft that rotates together with the laminated core.

A rotating electric machine according to a second aspect of the invention includes a stator core and a rotor core, and the rotor core includes an annular laminated core formed by laminating a plurality of electromagnetic steel sheets and a plurality of circumferentially provided magnetic poles. The laminated core includes a plurality of permanent magnets, and the laminated core is separated from the outer circumferential surface of the laminated core via the bridge portion, and has an outer flux barrier section provided near the outer circumferential surface, and an outer flux barrier section on the opposite side of the outer flux barrier section. an inner flux barrier section provided on the radially inner side of the laminated core, and includes a plurality of magnet holes into which permanent magnets are inserted, and all inner flux barrier sections of the plurality of magnet holes are hollow. A resin part made of resin is disposed in all the outer flux barrier parts of the plurality of magnet hole parts.

In the rotating electric machine according to the second aspect of the invention, as described above, all the inner flux barrier parts of the plurality of magnet holes provided on the radially inner side of the laminated core on the opposite side from the outer flux barrier part are hollow. A resin portion made of resin is disposed in all the outer flux barrier portions of the plurality of magnet holes provided near the outer peripheral surface of the laminated core. As a result, the weight inside the magnet hole (rotor core) can be reduced by not arranging the resin part in the inner flux barrier part, compared to the case where resin parts are arranged in the flux barrier parts at both ends of the magnet hole part. can. For this reason, compared to the case where resin parts are placed in the flux barrier parts at both ends of the magnet hole, the weight inside the magnet hole is reduced.The centrifugal force acting on the rotor core causes the area near the flux barrier part outside the magnet hole to be It is possible to reduce the stress acting on the Further, the outer flux barrier section in which the resin section is arranged can absorb and relieve the centrifugal force acting on the permanent magnet. This also makes it possible to reduce stress acting near the outer flux barrier section of the magnet hole section due to centrifugal force. As a result of the above, it is possible to provide a rotating electric machine that can reduce the weight inside the magnet hole and reduce the stress acting near the outer flux barrier part of the magnet hole due to centrifugal force. . Further, since it is not necessary to arrange a resin part in the inner flux barrier part and the amount of resin part used can be reduced, the manufacturing cost of the rotor core can be reduced.

In the rotor core and rotating electrical machine, the following configurations are also possible.

(Additional notes)
In the rotor core and rotating electric machine, the outer flux barrier portion is smaller than the inner flux barrier portion when viewed from the axial direction of the shaft inserted into the laminated core.

With this configuration, the amount of resin part disposed in the outer flux barrier part can be relatively reduced, so the weight inside the magnet hole part can be further reduced. As a result, the stress acting on the vicinity of the outer flux barrier section of the magnet hole section due to centrifugal force can be more effectively reduced.

FIG. 1 is a plan view showing the configuration of a rotating electric machine according to an embodiment. FIG. 3 is a plan view showing an enlarged view of one magnetic pole of the rotor core according to the embodiment. FIG. 2 is a schematic cross-sectional view of the rotor core at the position of the outer flux barrier portion and the rotation axis of the rotor core according to the embodiment, and is a diagram for explaining a resin portion disposed between electromagnetic steel plates. FIG. 3 is a schematic cross-sectional view of the rotor core at the position of the inner flux barrier part and the rotation axis of the rotor core according to the embodiment, and is a diagram for explaining a cooling fluid passage. FIG. 4 is a diagram for explaining a cooling fluid passage according to a modification, and corresponds to FIG. 4 of the embodiment. FIG. 7 is an enlarged plan view showing one magnetic pole of a rotor core according to a modified example.

Embodiments of the present invention will be described below based on the drawings.

A rotating electric machine 100 including a rotor core 1 according to this embodiment will be described with reference to FIGS. 1 to 4.

In the following description, the "axial direction" means a direction along the axial direction of the shaft 2, and is indicated by the Z direction in each figure. The "axial direction" is also the direction along the rotation axis C1 of the rotor core 1 (laminated core 10).

In the following description, "radial direction" means the radial direction of the rotor core 1, and is indicated by the R direction in each figure. In each figure, the radially inner side is shown by the R2 direction, and the radially outer side is shown by the R1 direction.

In the following description, "circumferential direction" means the circumferential direction of the rotor core 1, and is indicated by the E direction in each figure.

As shown in FIG. 1, the rotating electric machine 100 includes a stator 101 and a rotor 102. Stator 101 and rotor 102 are each formed in an annular shape. Stator 101 and rotor 102 are opposed to each other. The rotor 102 is arranged radially inside (R2 direction side) of the stator 101. That is, the rotating electrical machine 100 of this embodiment is configured as an inner rotor type rotating electrical machine.

(Stator configuration)
The stator 101 includes a stator core 101a and a coil (not shown) disposed in the stator core 101a.

For example, the stator core 101a is made up of a plurality of electromagnetic steel sheets S stacked in the axial direction, and is configured to allow magnetic flux to pass therethrough. The coil is connected to an external power supply unit and is configured to be supplied with power (for example, three-phase AC power). The coil is configured to generate a magnetic field when supplied with electric power.

(Rotor configuration)
The rotor 102 includes a rotor core 1, a shaft 2, and a cooling fluid passage 3 (see FIG. 4).

The rotor core 1 is provided with a shaft insertion hole 1a into which the shaft 2 is inserted. The shaft 2 is connected to an engine, an axle, etc. via a rotational force transmitting member such as a gear. Although this is an example, the rotating electrical machine 100 is configured as a motor, a generator, or a motor/generator, and is configured to be mounted on a vehicle.

The rotor core 1 includes an annular laminated core 10 and a plurality of permanent magnets 11.

The laminated core 10 is configured by laminating a plurality of electromagnetic steel plates S in the axial direction (Z direction). The rotating electric machine 100 is configured as an interior permanent magnet motor (IPM motor). The plurality of permanent magnets 11 constitute a plurality of circumferential magnetic poles M.

As shown in FIG. 2, each of the plurality of magnetic poles M has five permanent magnets 11. As an example, the rotor 102 has eight magnetic poles M arranged in a row in the circumferential direction (E direction) at a pitch of 45 degrees.

The permanent magnet 11 has a rectangular cross section perpendicular to the axial direction (Z direction) of the rotor core 1 . Note that the permanent magnet 11 is, for example, a neodymium magnet.

In each magnetic pole M, the laminated core 10 includes a plurality of magnet holes 12, 13, 14 into which the permanent magnets 11 are inserted. The magnet holes 12 , 13 , and 14 extend in the axial direction of the rotor core 1 and penetrate the laminated core 10 .

In each magnetic pole M, the magnet hole portion 12 is a pair of holes arranged line-symmetrically with respect to the d-axis. That is, the laminated core 10 is provided with a total of 16 magnet holes 12 (a total of 8 pairs of magnet holes 12). The pair of magnet holes 12 have a shape that widens toward the end so that they are spaced apart from each other from the inner circumferential side (R2 direction side) to the outer circumferential side (R1 direction side) when viewed from the axial direction (Z direction). . Therefore, the magnet hole 12 has an inner end located on the inner peripheral side in the radial direction (R2 direction side) and an outer peripheral end located on the outer peripheral side in the radial direction (R1 direction side). have. The magnet hole 12 is formed by two opposing walls extending linearly and two arcuate walls connecting the ends of the two opposing walls when viewed from the axial direction (Z direction). It is configured.

In each magnetic pole M, the magnet hole portion 13 is a pair of holes arranged line-symmetrically with respect to the d-axis. That is, the laminated core 10 is provided with a total of 16 magnet holes 13 (a total of 8 pairs of magnet holes 13). The magnet holes 13 are arranged closer to the q-axis than the magnet holes 12, and are arranged on both sides of the magnet holes 12 in the circumferential direction (E direction) so as to sandwich the pair of magnet holes 12 therebetween. There is. The pair of magnet holes 13 have a shape that widens toward the end so that they are spaced apart from each other from the inner circumferential side (R2 direction side) toward the outer circumferential side (R1 direction side) when viewed from the axial direction (Z direction). . Therefore, the magnet hole 13 has an inner end located on the inner peripheral side in the radial direction (R2 direction side) and an outer peripheral end located on the outer peripheral side in the radial direction (R1 direction side). have. When viewed from the axial direction (Z direction), the magnet hole 13 includes two opposing walls that extend linearly and two arcuate walls that connect the ends of the two opposing walls. It is configured.

In each magnetic pole M, only one magnet hole 14 is provided so as to straddle both sides of the d-axis, and has a shape that is line symmetrical with respect to the d-axis. That is, a total of eight magnet holes 14 are provided in the laminated core 10. The magnet hole 14 has a V-shape that widens from the inner circumferential side (R2 direction side) toward the outer circumferential side (R1 direction side). The flux barrier portions at both ends of the magnet hole portion 14 are formed by hollow portions.

Each of the plurality of magnet holes 12 and 13 has an outer flux barrier part F1 and an inner flux barrier part F2.

The outer flux barrier portion F1 is separated from the outer circumferential surface 10a of the laminated core 10 via the bridge portion 10b, and is provided near the outer circumferential surface 10a of the laminated core 10. That is, a bridge portion 10b is formed by the outer peripheral surface 10a of the laminated core 10 and the outer flux barrier portion F1. The inner flux barrier section F2 is provided on the radially inner side of the laminated core 10 on the opposite side of the outer flux barrier section F1 with respect to the permanent magnets 11 inserted into the magnet holes 12 and 13.

All the inner flux barrier parts F2 of the plurality of magnet holes 12 and 13 are formed by a hollow part F20. No resin is placed in the plurality of inner flux barrier parts F2. In addition, resin portions F10 made of resin are arranged in all the outer flux barrier portions F1 of the plurality of magnet holes 12 and 13. Specifically, in all the magnet holes 12 and 13 separated from the outer peripheral surface 10a of the laminated core 10 via the bridge portion 10b, an outer flux barrier portion F1 in which a resin portion F10 is disposed is provided.

As shown in FIG. 3, a resin portion F10 is disposed in the plurality of outer flux barrier portions F1 over the entire area from one end 10c to the other end 10d of the laminated core 10 in the axial direction (Z direction). That is, the plurality of outer flux barrier parts F1 are filled with the resin part F10.

The resin portion F10 is placed in the outer flux barrier portion F1 by filling. The resin portion F10 disposed in the outer flux barrier portion F1 is also disposed between the stacked electromagnetic steel plates S.

In detail, the resin part F10 is arranged also between the electromagnetic steel plates S by entering between the electromagnetic steel plates S when filling the outer flux barrier part F1. The resin portion F10 is disposed between the electromagnetic steel sheets S only in a portion near the outer flux barrier portion F1. In addition, the resin part may be arranged in the entire region between the electromagnetic steel plates.

The resin portion F10 shown in FIG. 2 is fixed to the magnet holes 12 and 13. That is, the resin part F10 is fixed to the magnet holes 12, 13 so that it cannot be separated from the magnet holes 12, 13.

Here, as a result of intensive study conducted by the inventors of the present application through simulations, etc., the resin part F10 It has been found that when the magnet holes 12 and 13 are fixed to the magnet holes 12 and 13, the stress (mainly stress in the circumferential direction) generated in the bridge portion 10b can be reduced.

As an example, the resin forming the resin portion F10 is a thermosetting resin such as PF (phenol resin) or EP (epoxy resin). In addition, the resin forming the resin portion may be a thermoplastic resin such as PA (polyamide) or PPS (polyphenylene sulfide).

The (volume of) the outer flux barrier part F1 is smaller than (the volume of) the inner flux barrier part F2. That is, since the outer flux barrier portion F1 has a relatively small volume, it is not filled with a large amount of the resin portion F10.

As shown in FIG. 4, the cooling fluid passage 3 is connected to an inner flux barrier section F2 formed by a hollow section F20. The cooling fluid passage 3 is configured to flow cooling fluid into the inner flux barrier section F2. As an example, the cooling fluid is a predetermined coolant liquid, oil, water, or the like.

Specifically, the cooling fluid passage 3 is provided in the shaft 2 that is inserted into the laminated core 10 and rotates together with the laminated core 10, and serves as a shaft-side cooling fluid supply passage 30 through which the cooling fluid supplied to the inner flux barrier section F2 flows. , and a core-side cooling fluid supply path 31 provided in the laminated core 10 of the rotor core 1. The cooling fluid passage 3 is configured to supply cooling fluid to the inner flux barrier portion F2 of the magnet holes 12 and 13 via the shaft-side cooling fluid supply path 30 and the core-side cooling fluid supply path 31. Note that the shaft-side cooling fluid supply path 30 may be configured to branch the existing cooling fluid flowing inside the shaft 2 and supply it to the inner flux barrier section F2, or may be configured to supply a dedicated cooling fluid to the inner flux barrier section F2. It may be configured to supply the following.

The core-side cooling fluid supply path 31 has one upstream end connected to the shaft-side cooling fluid supply path 30, and the other downstream end connected to the inner flux barrier portion F2. The core-side cooling fluid supply path 31 is connected to the inner flux barrier portion F2 of one of the magnet holes 12 and 13 near the center of the laminated core 10 in the axial direction (Z direction).

Further, the core-side cooling fluid supply path 31 connects the inner flux barrier portion F2 of the magnet hole portion 12 and the inner flux barrier portion F2 of the magnet hole portion 13 at a plurality of (2) locations. Thereby, the core-side cooling fluid supply path 31 supplies cooling fluid from the inner flux barrier section F2 of one of the magnet holes 12 and 13 to the other inner flux barrier section F2 of the magnet holes 12 and 13. It is configured.

The cooling fluid passage 3 also includes a cooling fluid discharge path (not shown). The cooling fluid discharge path is provided in the laminated core 10 of the rotor core 1 and is configured to discharge the cooling fluid from the inner flux barrier portion F2. Note that the cooling fluid discharge path may be configured to discharge the cooling fluid via the laminated core 10 and the shaft 2, or may be configured to discharge the cooling fluid from the laminated core 10 without passing through the shaft 2. may have been done.

(Effects of this embodiment)
In this embodiment, the following effects can be obtained.

In this embodiment, as described above, all the inner flux barrier parts F2 of the plurality of magnet holes 12 and 13 provided on the radially inner side of the laminated core 10 on the opposite side to the outer flux barrier part F1 are moved to the hollow part. A resin portion F10 made of resin is disposed in all the outer flux barrier portions F1 of the plurality of magnet holes 12 and 13 formed of F20 and provided near the outer peripheral surface 10a of the laminated core 10. As a result, compared to the case where resin parts are arranged in the flux barrier parts at both ends of the magnet hole part, the inner flux barrier part F2 is not arranged with the resin part F10. weight can be reduced. Therefore, the centrifugal force acting on the rotor core 1, whose weight inside the magnet holes 12 and 13 is reduced, compared to the case where resin parts are arranged in the flux barrier parts at both ends of the magnet holes 12 and 13, causes the magnets to Stress acting near the outer flux barrier portion F1 of the holes 12 and 13 can be reduced. Moreover, the outer flux barrier part F1 in which the resin part F10 is arranged can absorb and relieve the centrifugal force acting on the permanent magnet 11. This also makes it possible to reduce the stress acting on the vicinity of the outer flux barrier portion F1 of the magnet holes 12 and 13 due to centrifugal force. As a result of the above, the weight inside the magnet holes 12 and 13 can be reduced, and the stress acting on the vicinity of the outer flux barrier portion F1 of the magnet holes 12 and 13 due to centrifugal force can be reduced. Further, it is not necessary to arrange the resin part F10 in the inner flux barrier part F2, and the amount of resin part F10 used can be reduced, so the manufacturing cost of the rotor core 1 can be reduced.

In this embodiment, as described above, the resin portion F10 disposed in the outer flux barrier portion F1 is also disposed between the stacked electromagnetic steel plates S. Thereby, the strength of the laminated core 10 can be increased by increasing the adhesion between the laminated electromagnetic steel plates S in the lamination direction (axial direction) by the resin portion F10.

In this embodiment, as described above, the resin portion F10 is disposed in the outer flux barrier portion F1 over the entire area from the one end 10c to the other end 10d of the laminated core 10 in the axial direction. This effectively reduces stress acting near the outer flux barrier part F1 of the magnet holes 12 and 13 due to centrifugal force, compared to the case where the resin part is arranged only in a part of the laminated core in the axial direction. can do. Moreover, the strength of the laminated core 10 can be increased by the resin portion F10 disposed over the entire area from one end 10c to the other end 10d of the laminated core 10 in the axial direction.

In this embodiment, as described above, the cooling fluid passage 3 is further provided, which is connected to the inner flux barrier part F2 formed by the hollow part F20 and allows cooling fluid to flow into the inner flux barrier part F2. This allows the cooling fluid to flow through the cooling fluid passage 3 to the inner flux barrier portion F2, so that the rotor core 1 can be effectively cooled. Therefore, the inner flux barrier part F2 formed by the hollow part F20 can reduce the weight inside the magnet holes 12 and 13, and the centrifugal force can reduce the weight in the magnet holes 12 and 13 near the outer flux barrier part F1. The rotor core 1 can be effectively cooled using the inner flux barrier portion F2 while reducing the applied stress.

In this embodiment, as described above, the cooling fluid passage 3 is provided on the shaft 2 that is inserted into the laminated core 10 and rotates together with the laminated core 10, and is provided on the shaft side through which the cooling fluid supplied to the inner flux barrier section F2 flows. A cooling fluid supply path 30 is included. Thereby, the cooling fluid can easily flow into the inner flux barrier portion F2 via the shaft-side cooling fluid supply path 30 provided in the shaft 2 that rotates together with the laminated core 10.

In this embodiment, as described above, the outer flux barrier portion F1 is smaller than the inner flux barrier portion F2 when viewed from the axial direction of the shaft 2 inserted into the laminated core 10. As a result, the amount of the resin portion F10 arranged in the outer flux barrier portion F1 can be made relatively small, so that the weight inside the magnet holes 12 and 13 can be further reduced. As a result, the stress acting near the outer flux barrier portion F1 of the magnet holes 12 and 13 due to centrifugal force can be more effectively reduced.

[Modified example]
Note that the embodiments disclosed this time should be considered to be illustrative in all respects and not restrictive. The scope of the present invention is indicated by the claims rather than the description of the embodiments described above, and further includes all changes (modifications) within the meaning and range equivalent to the claims.

For example, in the above embodiment, an example was shown in which the cooling fluid passage was connected to the inner flux barrier section near the center position in the axial direction (Z direction) of the laminated core, but the present invention is not limited to this. In the present invention, the cooling fluid passage 203 may be connected to one end of the inner flux barrier portion F2, as in a modified rotating electrical machine 200 shown in FIG. In this case, the cooling fluid is discharged from the other end side of the inner flux barrier section F2.

Further, in the above embodiment, an example was shown in which the rotating electric machine includes a cooling fluid passage through which cooling fluid flows through the inner flux barrier portion, but the present invention is not limited to this. In the present invention, the rotating electric machine does not need to be provided with a cooling fluid passageway that allows cooling fluid to flow through the inner flux barrier section.

Further, in the above embodiment, an example was shown in which the magnet hole was formed in a straight line, but the present invention is not limited to this. In the present invention, the magnet hole portion may be formed in an arc shape. Specifically, each of the magnet holes 312 and 313 may be formed by a pair of arc-shaped holes that are symmetrical about the d-axis, as in a modified rotating electrical machine 300 shown in FIG. . Further, the present invention can be applied to magnet holes other than V-shaped as long as the magnet holes have an inner diameter side and an outer diameter side.

Further, in the embodiment described above, an example has been shown in which the resin portion is disposed in the outer flux barrier portion by filling the outer flux barrier portion with resin, but the present invention is not limited to this. In the present invention, the resin part may be arranged in the outer flux barrier part by inserting a solid resin part into the outer flux barrier part.

Further, in the above embodiment, an example was shown in which the outer flux barrier part was formed smaller than the inner flux barrier part when viewed from the axial direction of the shaft inserted into the laminated core, but the present invention is not limited to this. . In the present invention, the outer flux barrier section may be formed to have the same size as the inner flux barrier section or larger than the inner flux barrier section when viewed from the axial direction of the shaft inserted into the laminated core.

Further, in the above embodiment, an example was shown in which the resin portion was arranged between the laminated electromagnetic steel sheets, but the present invention is not limited to this. In the present invention, it is not necessary to arrange the resin portion between the stacked electromagnetic steel sheets.

Further, in the above embodiment, an example was shown in which the rotating electric machine has eight magnetic poles, but the present invention is not limited to this. In the present invention, the rotating electrical machine may have a different number of magnetic poles than eight.

Further, in the above embodiment, an example is shown in which the rotor core includes four magnet holes in one magnetic pole, each having both an inner flux barrier part formed by a hollow part and an outer flux barrier part in which a resin part is arranged. However, the present invention is not limited to this. In the present invention, the rotor core includes, in one magnetic pole, a number of magnet holes having both an inner flux barrier part formed by a hollow part and an outer flux barrier part in which a resin part is arranged, in a number different from four. Good too.

Further, in the above embodiment, an example was shown in which the rotor core has five permanent magnets in one magnetic pole, but the present invention is not limited to this. According to the invention, the rotor core may have a number of permanent magnets different from five in one magnetic pole.

1 Rotor core 2 Shaft 3, 203 Cooling fluid passage 10 Laminated core 10a Outer peripheral surface (of the laminated core) 10b Bridge portion (of the laminated core) 10c One end (in the axial direction of the laminated core) 10d Other side (in the axial direction of the laminated core) End 11 Permanent magnet 12, 13, 312, 313 Magnet hole 30 Shaft side cooling fluid supply path 100, 200, 300 Rotating electric machine 101 Stator 101a Stator core F1 Outer flux barrier part F2 Inner flux barrier part F10 (Arranged in the outer flux barrier part ) Resin part F20 (forming the inner flux barrier part) Hollow part M Magnetic pole S Electromagnetic steel plate

Claims (6)

An annular laminated core formed by laminating multiple electromagnetic steel sheets,
A plurality of permanent magnets forming a plurality of circumferential magnetic poles,
The laminated core is separated from the outer circumferential surface of the laminated core via a bridge portion, and includes an outer flux barrier section provided near the outer circumferential surface, and a radial direction of the laminated core on the opposite side of the outer flux barrier section. an inner flux barrier section provided on the inside, and includes a plurality of magnet holes into which the permanent magnets are inserted;
All of the inner flux barrier parts of the plurality of magnet hole parts are formed by a hollow part,
A rotor core, wherein a resin part made of resin is disposed in all the outer flux barrier parts of the plurality of magnet holes. The rotor core according to claim 1, wherein the resin portion disposed in the outer flux barrier portion is also disposed between the laminated electromagnetic steel sheets. The rotor core according to claim 1, wherein the resin portion is disposed in the outer flux barrier portion over the entire area from one end to the other end of the laminated core in the axial direction. The rotor core according to claim 1 , further comprising a cooling fluid passage connected to the inner flux barrier portion formed by the hollow portion and allowing cooling fluid to flow through the inner flux barrier portion. 4 . The cooling fluid passage includes a shaft-side cooling fluid supply passage that is provided on a shaft that is inserted into the laminated core and rotates together with the laminated core, and that allows the cooling fluid to be supplied to the inner flux barrier section to flow. Rotor core described in. Equipped with a stator core and a rotor core,
The rotor core is
An annular laminated core formed by laminating multiple electromagnetic steel sheets,
A plurality of permanent magnets forming a plurality of circumferential magnetic poles,
The laminated core is separated from the outer circumferential surface of the laminated core via a bridge portion, and includes an outer flux barrier section provided near the outer circumferential surface, and a radial direction of the laminated core on the opposite side of the outer flux barrier section. an inner flux barrier section provided on the inside, and includes a plurality of magnet holes into which the permanent magnets are inserted;
All of the inner flux barrier parts of the plurality of magnet hole parts are formed by a hollow part,
A rotating electrical machine, wherein a resin part made of resin is disposed in all of the outer flux barrier parts of the plurality of magnet holes.

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