Rotor of a rotating electrical machine

Abstract

The present invention provides a rotor of a rotating electrical machine that can easily form a saturation portion. The rotor (10) of the rotating electrical machine (1) includes a rotor core (20) and a plurality of magnetic pole portions (30) formed on the rotor core (20). Each magnetic pole portion (30) has a first magnet receiving hole (51) and a first permanent magnet (61) received in the first magnet receiving hole (51). A first magnetic saturation portion (71) is formed at a position on the rotor core (20) facing at least one of the inner side surface (611) and the outer side surface (612) of the first permanent magnet (61). The first magnetic saturation portion (71) is composed of a convex portion (71a) formed between the wall portion (510) of the first magnet receiving hole (51) and at least one of the inner side surface (611) and the outer side surface (612) of the first permanent magnet (61), and a gap portion (71b) formed between the wall portion (510) of the first magnet receiving hole (51) and at least one of the inner side surface (611) and the outer side surface (612) of the first permanent magnet (61).

Description

Technical Field

[0001] The present invention relates to a rotor of a rotating electric machine. Background Art

[0002] Conventionally, a rotating electric machine is known which includes a stator having a coil mounted thereon and a rotor having a magnet mounted thereon. In such a rotating electric machine, the magnetic field of the stator generated by the current flowing through the coil interacts with the magnetic field of the rotor generated by the magnet mounted on the rotor, thereby rotationally driving the rotor. Thus, since the rotating electric machine can obtain rotational power from electric energy, in recent years, as a measure for realizing a low-carbon society, electric vehicles such as hybrid vehicles, electric vehicles, and fuel cell vehicles, which are equipped with a rotating electric machine and driven by the rotational power of the rotating electric machine, are becoming popular.

[0003] Moreover, there is a strong demand for the rotating electric machine mounted on an electric vehicle to be energy-saving and high-output. Therefore, it is desired to maintain the maximum output torque during high-load operation and reduce the losses generated in the rotating electric machine during no-load operation and low-load operation.

[0004] Therefore, for example, Patent Document 1 discloses a rotating electric machine including an inner peripheral side rotor and an outer peripheral side rotor. The rotating electric machine according to Patent Document 1 changes the excitation state of the rotor of the rotating electric machine by engaging and disengaging the inner peripheral side rotor and the outer peripheral side rotor, thereby maintaining the maximum output torque during high-load operation and reducing the losses generated in the rotating electric machine during no-load operation and low-load operation.

[0005] Prior Art Documents

[0006] Patent Documents

[0007] Patent Document 1: Japanese Unexamined Patent Application Publication No. 2007-236049 Summary of the Invention

[0008] Problems to be Solved by the Invention

[0009] However, the rotating electric machine according to Patent Document 1 requires an oil passage for engaging and disengaging the inner peripheral side rotor and the outer peripheral side rotor and a phase control device for supplying hydraulic pressure for engaging and disengaging the inner peripheral side rotor and the outer peripheral side rotor. Therefore, the rotating electric machine according to Patent Document 1 has a problem of structural complexity.

[0010] The present invention provides a rotor of a rotating electric machine capable of easily forming a saturation portion that can suppress a decrease in the maximum output torque during high-load operation of the rotating electric machine and can reduce the losses generated in the rotating electric machine during no-load operation.

[0011] Means for Solving the Problems

[0012] The present invention provides a rotor of a rotating electric machine, comprising:

[0013] A rotor core having a substantially ring shape centered on a rotation axis; and

[0014] A plurality of magnetic pole portions formed circumferentially on the rotor core,

[0015] wherein each magnetic pole portion has: a magnet receiving hole formed in the rotor core and extending in the axial direction; and a permanent magnet received in the magnet receiving hole, and

[0016] the permanent magnet has a first main surface extending in the axial direction and a second main surface extending in the axial direction,

[0017] the magnet receiving hole has a wall portion forming a contour of the magnet receiving hole as viewed from the axial direction,

[0018] As viewed from the axial direction, a saturation portion that is magnetically saturated during no-load operation of the rotating electrical machine is formed at a position of the rotor core facing at least one of the first main surface and the second main surface of the permanent magnet,

[0019] As viewed from the axial direction, the saturation portion includes: a core protrusion formed by a part of the rotor core extending in a direction intersecting the first main surface or the second main surface between the wall portion of the magnet receiving hole and at least one of the first main surface and the second main surface of the permanent magnet; and a non-magnetic portion formed between the wall portion of the magnet receiving hole and at least one of the first main surface and the second main surface of the permanent magnet.

[0020] Advantageous Effects of the Invention

[0021] According to the present invention, in the rotor of a rotating electrical machine, as viewed from the axial direction, the saturation portion is composed of a core protrusion and a non-magnetic portion formed between the wall portion of the magnet receiving hole and at least one of the first main surface and the second main surface of the permanent magnet. Therefore, it is possible to suppress a decrease in the maximum output torque during high-load operation of the rotating electrical machine and to reduce the losses generated in the rotating electrical machine during no-load operation. In addition, since the saturation portion is composed of a core protrusion and a non-magnetic portion, the saturation portion can be easily formed. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 is a front view of a rotating electrical machine including a rotor of a rotating electrical machine according to a first embodiment of the present invention.

[0023] Figure 2 is Figure 1 a front view of a magnetic pole portion of the rotor in

[0024] Figure 3AIt is an equipotential line diagram of the magnetic flux density of the magnetic pole portion of the rotor during no-load operation of the rotating electrical machine when the first magnetic saturation portion, the second magnetic saturation portion, and the third magnetic saturation portion according to the present invention are formed.

[0025] Figure 3B It is an equipotential line diagram of the magnetic flux density of the magnetic pole portion of the rotor during no-load operation of the rotating electrical machine when the first magnetic saturation portion, the second magnetic saturation portion, and the third magnetic saturation portion according to the present invention are not formed.

[0026] Figure 4A It is an equipotential line diagram of the magnetic flux density of the magnetic pole portion of the rotor according to the present invention during no-load operation of the rotating electrical machine.

[0027] Figure 4B It is an equipotential line diagram of the magnetic flux density of the magnetic pole portion of the rotor according to the present invention during high-load operation of the rotating electrical machine.

[0028] Figure 5 It shows when changing Figure 1 It is a graph of the maximum output torque - no-load operation loss characteristics of the rotating electrical machine when the duty ratios of the first magnetic saturation portion, the second magnetic saturation portion, and the third magnetic saturation portion of the rotor of the rotating electrical machine according to the first embodiment are changed.

[0029] Figure 6 It is a diagram showing a modified example of the first magnetic saturation portion of the rotor of the rotating electrical machine according to the first embodiment of the present invention.

[0030] Figure 7 It is a diagram showing a first embodiment of the first magnetic saturation portion of the rotor of the rotating electrical machine according to the second embodiment of the present invention.

[0031] Figure 8 It is a diagram showing a second embodiment of the first magnetic saturation portion of the rotor of the rotating electrical machine according to the second embodiment of the present invention.

[0032] Figure 9 It is a diagram showing a third embodiment of the first magnetic saturation portion of the rotor of the rotating electrical machine according to the second embodiment of the present invention.

[0033] Figure 10 It is a front view of the magnetic pole portion of the rotor of the rotating electrical machine according to the third embodiment of the present invention.

[0034] Figure 11 It is a diagram showing a B-H curve with the vertical axis being the magnetic flux density B and the horizontal axis being the magnetic field H, and the state where the magnetic permeability, that is, the slope of the B-H curve, starts to decrease in the first magnetic saturation portion, the second magnetic saturation portion, and the third magnetic saturation portion according to the present invention.

[0035] Description of reference numerals

[0036] 1 Rotating electrical machine

[0037] 10 Rotor

[0038] 20 Rotor core

[0039] 30 Pole part

[0040] 31q First q-axis magnetic path (q-axis magnetic path)

[0041] 32q Second q-axis magnetic path (q-axis magnetic path)

[0042] 51 First magnet receiving hole (magnet receiving hole)

[0043] 510 Wall part

[0044] 52 Second magnet receiving hole (magnet receiving hole)

[0045] 520 Wall part

[0046] 53 Third magnet receiving hole (magnet receiving hole)

[0047] 530 Wall part

[0048] 61 First permanent magnet (permanent magnet)

[0049] 611 Inner side surface (first main surface)

[0050] 612 Outer side surface (second main surface)

[0051] 62 Second permanent magnet (permanent magnet)

[0052] 621 Inner side surface (first main surface)

[0053] 622 Outer side surface (second main surface)

[0054] 63 Third permanent magnet (permanent magnet)

[0055] 631 Inner side surface (first main surface)

[0056] 632 Outer side surface (second main surface)

[0057] 71 First magnetic saturation part (saturation part)

[0058] 71a Protrusion (core protrusion)

[0059] 71b Gap part (non-magnetic part)

[0060] 71c Protruding part (core protrusion)

[0061] 71d Gap part (non-magnetic part)

[0062] 711 Main surface

[0063] 712 Side

[0064] 72 Second magnetic saturation part (saturation part)

[0065] 72a Protrusion (iron core protrusion)

[0066] 72b Gap part (non-magnetic part)

[0067] 721 Main surface

[0068] 722 Side

[0069] 73 Third magnetic saturation part (saturation part)

[0070] 73a Protrusion (iron core protrusion)

[0071] 73b Gap part (non-magnetic part)

[0072] 731 Main surface

[0073] 732 Side

[0074] RC Rotation axis Detailed implementation manners

[0075] Hereinafter, each embodiment of the rotating electrical machine including the rotor of the rotating electrical machine of the present invention will be described based on the drawings. It should be noted that the drawings should be viewed in the direction of the reference numerals. In addition, in this specification and the like, unless otherwise specified, the axial direction, the radial direction, and the circumferential direction refer to the directions based on the rotation axis of the rotor. In addition, the inner side in the axial direction refers to the central side in the axial direction of the rotating electrical machine, and the outer side in the axial direction refers to the side away from the center in the axial direction of the rotating electrical machine. In addition, the inner side in the circumferential direction refers to the central side in the circumferential direction of the magnetic pole part, and the outer side in the circumferential direction refers to the side away from the central side in the circumferential direction of the magnetic pole part.

[0076] [First Embodiment]

[0077] First, refer to Figures 1 to 6 to describe the rotor of the rotating electrical machine according to the first embodiment of the present invention.

[0078] <Rotating Electrical Machine>

[0079] As Figure 1 shown, the rotating electrical machine 1 according to the present embodiment includes: a rotor 10 having a substantially annular shape centered on the rotation axis RC and rotating around the rotation axis RC; and a stator 90 disposed to surround the outer peripheral surface of the rotor 10.

[0080] <Rotor>

[0081] As Figure 1As shown, the rotor 10 of the rotating electric machine according to the present embodiment includes a rotor core 20 having a substantially ring shape centered on a rotation axis RC, and a plurality of magnetic pole portions 30 formed in the rotor core 20 in the circumferential direction.

[0082] The rotor core 20 has a substantially ring shape centered on the rotation axis RC. The inner circumferential surface 21 of the rotor core 20 serves as the wall surface of a rotor shaft hole that fastens a rotor shaft (not shown) to the inside of the ring of the rotor core 20 by press-fitting or the like.

[0083] The rotor core 20 is formed by laminating a plurality of electromagnetic steel sheets 40 having a substantially ring shape centered on the rotation axis RC in the axial direction.

[0084] A plurality of magnetic pole portions 30 are formed at equal intervals in the circumferential direction. In the present embodiment, twelve magnetic pole portions 30 are formed at equal intervals, that is, at 30-degree intervals, in the circumferential direction.

[0085] In this specification and the like, when viewed from the axial direction, an axis extending radially at the circumferential center of each magnetic pole portion 30 is defined as the d-axis (d-axis in the figure), and an axis extending radially at the circumferential end of each magnetic pole portion 30 and electrically angled 90 degrees with respect to the d-axis is defined as the q-axis (q-axis in the figure).

[0086] Each magnetic pole portion 30 has a magnet accommodation hole 50 extending in the axial direction formed in the rotor core 20 and a permanent magnet 60 accommodated in the magnet accommodation hole 50. In the present embodiment, each magnetic pole portion 30 has three magnet accommodation holes 50 and three permanent magnets 60 respectively accommodated in the three magnet accommodation holes 50.

[0087] <Stator>

[0088] The stator 90 includes: a stator core 91 having a substantially ring shape, which is arranged at a predetermined interval in the radial direction from the outer circumferential surface of the rotor 10; and a stator coil 92 mounted on the stator core 91.

[0089] When current flows through the stator coil 92, a magnetic field is generated in the stator 90. Moreover, the magnetic field generated in the stator 90 interacts with the magnetic field generated by the permanent magnets 60 of the respective magnetic pole portions 30 of the rotor 10, thereby rotating the rotor 10. In this way, the rotating electric machine 1 is rotationally driven.

[0090] <Magnetic Pole Portion>

[0091] As Figure 2 shown, when viewed from the axial direction, the magnet accommodation hole 50 formed in each magnetic pole portion 30 has: a first magnet accommodation hole 51 that extends in the circumferential direction substantially orthogonally to the d-axis and has a shape substantially symmetric with respect to the d-axis; a second magnet accommodation hole 52 that is on one side in the circumferential direction with respect to the d-axis ( Figure 2is formed on the circumferential outer side of the first magnet housing hole 51 on the counterclockwise side); and a third magnet housing hole 53, which is formed on the circumferential other side ( Figure 2 on the clockwise side) of the first magnet housing hole 51 on the circumferential outer side. The second magnet housing hole 52 and the third magnet housing hole 53 are arranged in a substantially "C" shape such that the circumferential distance between them increases toward the radially outer side. Therefore, the second magnet housing hole 52 extends obliquely with respect to the circumferential direction so as to be on the radially outer side as it approaches the circumferential outer side. The third magnet housing hole 53 extends obliquely with respect to the circumferential direction so as to be on the radially outer side as it approaches the circumferential outer side. The second magnet housing hole 52 and the third magnet housing hole 53 are arranged such that the circumferential inner ends thereof are opposed to the circumferential ends of the first magnet housing hole 51 in the circumferential direction.

[0092] The three permanent magnets 60 include a first permanent magnet 61 housed in the first magnet housing hole 51, a second permanent magnet 62 housed in the second magnet housing hole 52, and a third permanent magnet 63 housed in the third magnet housing hole 53. The first permanent magnet 61, the second permanent magnet 62, and the third permanent magnet 63 are all plate-shaped with a substantially rectangular cross-section when viewed from the axial direction and extending along the axial direction.

[0093] When viewed from the axial direction, the first permanent magnet 61 has a rectangular shape with the direction substantially orthogonal to the d-axis as the length direction. The first permanent magnet 61 has: an inner side surface 611, which extends along the axial direction toward the radially inner side; an outer side surface 612, which extends along the axial direction toward the radially outer side; a first end surface 613a, which connects the inner side surface 611 and the outer side surface 612 at one circumferential end and extends along the axial direction; and a second end surface 613b, which connects the inner side surface 611 and the outer side surface 612 at the other circumferential end and extends along the axial direction. When viewed from the axial direction, the first permanent magnet 61 is magnetized in the direction orthogonal to the inner side surface 611 and the outer side surface 612.

[0094] The first magnet housing hole 51 has a wall portion 510 that forms the contour of the first magnet housing hole 51 when viewed from the axial direction. When viewed from the axial direction, the wall portion 510 includes: an inner side wall portion 511, which is opposed to the inner side surface 611 of the first permanent magnet 61 and extends along the axial direction; an outer side wall portion 512, which is opposed to the outer side surface 612 of the first permanent magnet 61 and extends along the axial direction; a first end wall portion 513a, which connects the circumferential one-end of the inner side wall portion 511 and the circumferential one-end of the outer side wall portion 512 and extends along the axial direction; and a second end wall portion 513b, which connects the circumferential other-end of the inner side wall portion 511 and the circumferential other-end of the outer side wall portion 512 and extends along the axial direction. When viewed from the axial direction, the first end wall portion 513a and the second end wall portion 513b extend obliquely toward the d-axis side as they move from the end of the inner side wall portion 511 to the end of the outer side wall portion 512.

[0095] When viewed axially, the second permanent magnet 62 extends obliquely with respect to the circumferential direction such that it is on the radially outer side as it approaches the outer circumferential side on the circumferential one side of the d-axis ( Figure 2 in the counterclockwise side in ). The second permanent magnet 62 has a substantially rectangular shape with the extending direction as the longitudinal direction. The second permanent magnet 62 has: an inner side surface 621 that extends along the longitudinal direction and the axial direction toward the radially inner side; an outer side surface 622 that extends along the longitudinal direction and the axial direction toward the radially outer side; a d-axis side end surface 623d that connects the d-axis side end of the inner side surface 621 and the d-axis side end of the outer side surface 622 and extends along the axial direction; and a q-axis side end surface 623q that connects the q-axis side end of the inner side surface 621 and the q-axis side end of the outer side surface 622 and extends along the axial direction. The second permanent magnet 62 is arranged such that the q-axis side end surface 623q is more radially outer than the first permanent magnet 61. When viewed axially, the second permanent magnet 62 is magnetized in a direction orthogonal to the inner side surface 621 and the outer side surface 622.

[0096] The second magnet housing hole 52 has a wall portion 520 that forms the contour of the second magnet housing hole 52 when viewed axially. When viewed axially, the wall portion 520 includes: an inner wall portion 521 that faces the inner side surface 621 of the second permanent magnet 62 and extends along the axial direction; an outer wall portion 522 that faces the outer side surface 622 of the second permanent magnet 62 and extends along the axial direction; a d-axis side wall portion 523d that connects the d-axis side end of the inner wall portion 521 and the d-axis side end of the outer wall portion 522 and extends along the axial direction; and a q-axis side wall portion 523q that connects the q-axis side end of the inner wall portion 521 and the q-axis side end of the outer wall portion 522 and extends along the axial direction. The d-axis side wall portion 523d extends opposite to the first end wall portion 513a of the first magnet housing hole 51. When viewed axially, the q-axis side wall portion 523q extends greatly bent from the ends of the inner wall portion 521 and the outer wall portion 522 toward the outer side in the longitudinal direction of the second permanent magnet 62, and a magnetic flux barrier is formed on the outer side in the longitudinal direction of the q-axis side end surface 623q of the second permanent magnet 62.

[0097] When viewed axially, the third permanent magnet 63 is on the other circumferential side of the d-axis ( Figure 2extends obliquely with respect to the circumferential direction so as to be radially outward as it approaches the circumferential outer side (the clockwise side in the figure), and has a substantially rectangular shape with the extending direction as the longitudinal direction. The third permanent magnet 63 has: an inner side surface 631 that extends in the longitudinal direction toward the radially inner side and extends in the axial direction; an outer side surface 632 that extends in the longitudinal direction toward the radially outer side and extends in the axial direction; a d-axis side end surface 633d that connects the d-axis side end of the inner side surface 631 and the d-axis side end of the outer side surface 632 and extends in the axial direction; and a q-axis side end surface 633q that connects the q-axis side end of the inner side surface 631 and the q-axis side end of the outer side surface 632 and extends in the axial direction. The third permanent magnet 63 is arranged such that the q-axis side end surface 633q is more radially outward than the first permanent magnet 61. When viewed from the axial direction, the third permanent magnet 63 is magnetized in a direction orthogonal to the inner side surface 631 and the outer side surface 632.

[0098] The third magnet housing hole 53 has a wall portion 530 that forms the contour of the third magnet housing hole 53 when viewed from the axial direction. When viewed from the axial direction, the wall portion 530 includes: an inner side wall portion 531 that faces the inner side surface 631 of the third permanent magnet 63 and extends in the axial direction; an outer side wall portion 532 that faces the outer side surface 632 of the third permanent magnet 63 and extends in the axial direction; a d-axis side wall portion 533d that connects the d-axis side end of the inner side wall portion 531 and the d-axis side end of the outer side wall portion 532 and extends in the axial direction; and a q-axis side wall portion 533q that connects the q-axis side end of the inner side wall portion 531 and the q-axis side end of the outer side wall portion 532 and extends in the axial direction. The d-axis side wall portion 533d extends facing the second end wall portion 513b of the first magnet housing hole 51. When viewed from the axial direction, the q-axis side wall portion 533q extends substantially bent outward in the longitudinal direction of the third permanent magnet 63 from the ends of the inner side wall portion 531 and the outer side wall portion 532, and a magnetic flux barrier is formed outside the longitudinal direction of the q-axis side end surface 633q of the third permanent magnet 63.

[0099] In the magnetic pole portion 30, a first q-axis magnetic path 31q is formed radially outside the first magnet housing hole 51, the second magnet housing hole 52, and the third magnet housing hole 53, and the q-axis linkage magnetic flux generated by the q-axis current flowing through the stator coil 92 passes through the first q-axis magnetic path 31q. Further, in the magnetic pole portion 30, a second q-axis magnetic path 32q is formed radially inside the first magnet housing hole 51, the second magnet housing hole 52, and the third magnet housing hole 53, and the q-axis linkage magnetic flux generated by the q-axis current flowing through the stator coil 92 passes through the second q-axis magnetic path 32q. Therefore, the first q-axis magnetic path 31q and the second q-axis magnetic path 32q are formed outside the first magnet housing hole 51, the second magnet housing hole 52, and the third magnet housing hole 53. In the first q-axis magnetic path 31q, the q-axis linkage magnetic flux is bent convexly toward the radially inner side along the outer wall portion 512 of the first magnet housing hole 51, the outer wall portion 522 of the second magnet housing hole 52, and the outer wall portion 532 of the third magnet housing hole 53 and passes therethrough. In the second q-axis magnetic path 32q, the q-axis linkage magnetic flux is bent convexly toward the radially inner side along the inner wall portion 511 of the first magnet housing hole 51, the inner wall portion 521 of the second magnet housing hole 52, and the inner wall portion 531 of the third magnet housing hole 53 and passes therethrough.

[0100] In the magnetic pole portion 30, a magnetic flux barrier region 33 is formed between the first q-axis magnetic path 31q and the second q-axis magnetic path 32q. The magnetic flux barrier region 33 includes the first magnet housing hole 51, the second magnet housing hole 52, and the third magnet housing hole 53, and is a region bent convexly toward the radially inner side along the first q-axis magnetic path 31q and the second q-axis magnetic path 32q. The magnetic flux barrier region 33 is preferably formed such that the q-axis magnetic flux does not pass therethrough as much as possible.

[0101] <Magnetic saturation portion>

[0102] The losses generated in the rotating electrical machine 1 include iron loss and copper loss. The iron loss is a loss caused by the physical properties of the rotor core 20 and the stator core 91. The copper loss is a loss caused by the resistance component of the stator coil 92. During no-load operation in which no power is supplied to the stator coil 92 and during low-load operation in which a small amount of power is supplied to the stator coil 92, the losses generated in the rotating electrical machine 1 have less copper loss because the current flowing through the stator coil 92 is zero or small, and the iron loss becomes dominant. On the other hand, during high-load operation in which a large amount of power is supplied to the stator coil 92, the losses generated in the rotating electrical machine 1 have dominant copper loss because the current flowing through the stator coil 92 is large.

[0103] Therefore, the rotating electrical machine 1 preferably suppresses a decrease in the maximum output torque during high-load operation and reduces the magnetic flux generated by the permanent magnet 60 during no-load operation and low-load operation, thereby reducing the iron loss.

[0104] (First magnetic saturation portion)

[0105] In the first magnet accommodation hole 51, a first magnetic saturation portion 71 is formed at a position facing at least one of the inner side surface 611 and the outer side surface 612 of the first permanent magnet 61. In the present embodiment, the first magnetic saturation portion 71 is formed at a position facing the inner side surface 611 of the first permanent magnet 61. When viewed axially, the first magnetic saturation portion 71 extends facing the surface of the first permanent magnet 61 facing the first magnetic saturation portion 71, which is the inner side surface 611 of the first permanent magnet 61 in the present embodiment.

[0106] The first magnetic saturation portion 71 has: convex portions 71a, which are formed by a part of the rotor core 20 protruding from the inner side wall portion 511 of the first magnet accommodation hole 51 toward the inner side surface 611 of the first permanent magnet 61, and a plurality of which are formed along the extending direction of the first magnetic saturation portion 71; and gap portions 71b, which are formed between adjacent convex portions 71a, and a plurality of which are formed along the extending direction of the first magnetic saturation portion 71.

[0107] In the present embodiment, the convex portions 71a are bent in a wave shape in the circumferential direction from the inner side wall portion 511 of the first magnet accommodation hole 51 and protrude toward the inner side surface 611 of the first permanent magnet 61.

[0108] In this way, when viewed axially, the first magnetic saturation portion 71 is formed inside the wall portion 510 of the first magnet accommodation hole 51. Moreover, when viewed axially, the first magnetic saturation portion 71 protrudes from the inner side wall portion 511 of the first magnet accommodation hole 51 toward the first permanent magnet 61 and extends facing the inner side surface 611 of the first permanent magnet. Moreover, the first magnetic saturation portion 71 includes convex portions 71a formed by a part of the rotor core 20 and gap portions 71b formed between the inner side wall portion 511 of the first magnet accommodation hole 51 and the inner side surface 611 of the first permanent magnet 61.

[0109] The first magnetic saturation portion 71 is formed to be magnetically saturated when the rotating electric machine 1 operates without load. Magnetic saturation means that the magnetic flux density of the magnetic field generated in the magnetization direction of the first permanent magnet 61 approaches the saturation magnetic flux density of the first magnetic saturation portion 71, and the magnetic permeability in the first magnetic saturation portion 71, that is, Figure 11 the state where the slope of the B-H curve with the vertical axis being the magnetic flux density B and the horizontal axis being the magnetic field H starts to decrease as shown.

[0110] As described above, the rotor core 20 is formed by laminating a plurality of electromagnetic steel sheets 40 having a substantially ring shape centered on the rotation axis RC in the axial direction. However, since the relative magnetic permeability of the gap portion 71b is lower than the relative magnetic permeability of the electromagnetic steel sheet 40, the saturation magnetic flux density of the first magnetic saturation portion 71 is lower than the saturation magnetic flux density of the portion where the electromagnetic steel sheets 40 are laminated in the axial direction without forming the gap portion in the rotor core 20.

[0111] Therefore, as shown in FIG. 3, the first magnetic saturation portion 71 is more likely to be magnetically saturated than the portion where the electromagnetic steel sheets 40 are laminated along the axial direction without forming a gap portion. Therefore, it can be configured such that when the rotating electrical machine 1 operates without load, the second q-axis magnetic path 32q of the rotor core 20 does not become magnetically saturated, while the first magnetic saturation portion 71 becomes magnetically saturated.

[0112] Moreover, the first magnetic saturation portion 71 is configured to be magnetically saturated when the rotating electrical machine 1 operates without load. Therefore, when the rotating electrical machine 1 operates without load, the first magnetic saturation portion 71 is magnetically saturated by the magnetic flux generated by the first permanent magnet 61, and the magnetic resistance of the first magnetic saturation portion 71 increases. Compared with the case where the first magnetic saturation portion 71 is not formed, the magnetic flux generated in the magnetization direction of the first permanent magnet 61 decreases.

[0113] When the rotating electrical machine 1 operates without load, the losses generated in the rotating electrical machine 1 are mainly iron losses. Therefore, through the first magnetic saturation portion 71, the losses generated in the rotating electrical machine 1 when the rotating electrical machine 1 operates without load can be reduced.

[0114] On the other hand, as shown in FIG. 4, when the rotating electrical machine 1 operates at a high load, a large current is supplied to the stator coil 92 to cause the stator 90 to generate a large magnetic field. At this time, the magnetic flux generated in the magnetization direction of the first permanent magnet 61 cancels out the d-axis interlinking magnetic flux generated by the negative d-axis current flowing through the stator coil 92. Therefore, it is less than when the rotating electrical machine 1 operates without load. Therefore, even if the first magnetic saturation portion 71 is formed to be magnetically saturated when the rotating electrical machine 1 operates without load, the first magnetic saturation portion 71 can be prevented from becoming magnetically saturated when the rotating electrical machine 1 operates at a high load. Therefore, even if the first magnetic saturation portion 71 is formed, the magnetic flux generated in the magnetization direction of the first permanent magnet 61 when the rotating electrical machine 1 operates at a high load is almost the same as the case where the first magnetic saturation portion 71 is not formed, and the rotating electrical machine 1 can suppress a decrease in the maximum output torque during high-load operation.

[0115] In this way, the rotor 10 of the rotating electrical machine 1 can suppress a decrease in the maximum output torque during high-load operation of the rotating electrical machine 1 and can reduce the losses generated in the rotating electrical machine 1 when the rotating electrical machine 1 operates without load and at a low load by forming the first magnetic saturation portion 71 in the first magnet accommodation hole 51. In addition, the first magnetic saturation portion 71 includes a convex portion 71a formed by a part of the rotor core 20 and a gap portion 71b formed between the inner side wall portion 511 of the first magnet accommodation hole 51 and the first permanent magnet 61. Therefore, the first magnetic saturation portion 71 can be easily formed. Moreover, the ratio of the convex portion 71a and the ratio of the gap portion 71b in the first magnetic saturation portion 71 can be easily adjusted. Therefore, the saturation magnetic flux density of the first magnetic saturation portion 71 can be easily adjusted.

[0116] Further, the first magnetic saturation portion 71 includes a convex portion 71a formed by a part of the rotor core 20 protruding from the inner side wall portion 511 of the first magnet receiving hole 51 toward the inner side surface 611 of the first permanent magnet 61, and a gap portion 71b formed between adjacent convex portions 71a. Therefore, by blanking the electromagnetic steel sheet 40 into a desired shape, the first magnetic saturation portion 71 can be formed while suppressing an increase in the manufacturing man-hours of the rotor 10.

[0117] Return Figure 2 , the first magnetic saturation portion 71 has: a main surface 711 extending opposite to the inner side surface 611 of the first permanent magnet 61; and a pair of side surfaces 712 extending from both end portions of the main surface 711 toward the inner side wall portion 511 of the first magnet receiving hole 51 and facing the outside in the extending direction of the first magnetic saturation portion 71. The pair of side surfaces 712 are formed to be exposed inside the first magnet receiving hole 51.

[0118] In the present embodiment, the main surface 711 is formed by the front end surfaces of a plurality of convex portions 71a. In addition, the pair of side surfaces 712 are formed by the surfaces of the convex portions 71a formed at both ends in the extending direction of the first magnetic saturation portion 71 and facing the outside in the extending direction of the first magnetic saturation portion 71.

[0119] Moreover, when viewed from the axial direction, in the first magnet receiving hole 51, the first permanent magnet 61 is disposed at a position separated from the wall portion 510 at both end portions of the inner side surface 611. In other words, when viewed from the axial direction, in the first magnet receiving hole 51, the first permanent magnet 61 is disposed at a position where it does not contact the inner side wall portion 511, the outer side wall portion 512, the first end wall portion 513a, and the second end wall portion 513b of the first magnet receiving hole 51 at both end portions of the inner side surface 611.

[0120] Therefore, the first magnetic saturation portion 71 is disposed in the magnetic flux barrier region 33 including the first magnet receiving hole 51, the second magnet receiving hole 52, and the third magnet receiving hole 53. In this way, the first magnetic saturation portion 71 is formed at a position avoiding the first q-axis magnetic path 31q and the second q-axis magnetic path 32q.

[0121] Thereby, the first magnetic saturation portion 71 is disposed at a position where the q-axis interlinkage magnetic flux caused by the q-axis current flowing through the stator coil 92 is not reduced. Therefore, the first magnetic saturation portion 71 can be provided while suppressing a decrease in the maximum output torque during high-load operation of the rotating electric machine 1.

[0122] (Second magnetic saturation portion)

[0123] In the second magnet accommodation hole 52, a second magnetic saturation portion 72 is formed at a position facing at least one of the inner side surface 621 and the outer side surface 622 of the second permanent magnet 62. In the present embodiment, the second magnetic saturation portion 72 is formed at a position facing the inner side surface 621 of the second permanent magnet 62. When viewed axially, the second magnetic saturation portion 72 extends in opposition to the surface of the second permanent magnet 62 that faces the second magnetic saturation portion 72, which is the inner side surface 621 of the second permanent magnet 62 in the present embodiment.

[0124] The second magnetic saturation portion 72 includes: convex portions 72a which are formed by a part of the rotor core 20 protruding from the inner side wall portion 521 of the second magnet accommodation hole 52 toward the inner side surface 621 of the second permanent magnet 62, and a plurality of which are formed along the extending direction of the second magnetic saturation portion 72; and gap portions 72b which are formed between adjacent convex portions 72a, and a plurality of which are formed along the extending direction of the second magnetic saturation portion 72.

[0125] In the present embodiment, the convex portions 72a are bent in a wave shape in the circumferential direction from the inner side wall portion 521 of the second magnet accommodation hole 52 and protrude toward the inner side surface 621 of the second permanent magnet 62.

[0126] In this way, when viewed axially, the second magnetic saturation portion 72 is formed inside the wall portion 520 of the second magnet accommodation hole 52. Moreover, when viewed axially, the second magnetic saturation portion 72 protrudes from the inner side wall portion 521 of the second magnet accommodation hole 52 toward the second permanent magnet 62 and extends in opposition to the inner side surface 621 of the second permanent magnet. Further, the second magnetic saturation portion 72 includes convex portions 72a formed by a part of the rotor core 20 and gap portions 72b formed between the inner side wall portion 521 of the second magnet accommodation hole 52 and the inner side surface 621 of the second permanent magnet 62.

[0127] The second magnetic saturation portion 72 is formed to be magnetically saturated when the rotating electrical machine 1 operates without load. Magnetic saturation means that the magnetic flux density of the magnetic field generated in the magnetization direction of the second permanent magnet 62 approaches the saturation magnetic flux density of the second magnetic saturation portion 72, and the magnetic permeability in the second magnetic saturation portion 72, that is, Figure 11 the slope of the B-H curve in which the vertical axis is the magnetic flux density B and the horizontal axis is the magnetic field H starts to decrease.

[0128] As described above, the rotor core 20 is formed by laminating a plurality of electromagnetic steel sheets 40 having a substantially ring shape centered on the rotation axis RC in the axial direction. However, since the relative magnetic permeability of the gap portion 72b is lower than the relative magnetic permeability of the electromagnetic steel sheet 40, the saturation magnetic flux density of the second magnetic saturation portion 72 is lower than the saturation magnetic flux density of the portion where the electromagnetic steel sheets 40 are laminated in the axial direction without forming the gap portion in the rotor core 20.

[0129] Therefore, as shown in FIG. 3, the second magnetic saturation portion 72 is more likely to be magnetically saturated than the portion where the electromagnetic steel sheets 40 are stacked axially without forming a gap portion. Therefore, it can be configured such that when the rotating electrical machine 1 operates without load, the second q-axis magnetic path 32q of the rotor core 20 does not become magnetically saturated, while the second magnetic saturation portion 72 becomes magnetically saturated.

[0130] Moreover, the second magnetic saturation portion 72 is configured to be magnetically saturated when the rotating electrical machine 1 operates without load. Therefore, when the rotating electrical machine 1 operates without load, the second magnetic saturation portion 72 is magnetically saturated by the magnetic flux generated by the second permanent magnet 62, and the magnetic resistance of the second magnetic saturation portion 72 increases. As compared with the case where the second magnetic saturation portion 72 is not formed, the magnetic flux generated in the magnetization direction of the second permanent magnet 62 decreases.

[0131] When the rotating electrical machine 1 operates without load, the loss generated in the rotating electrical machine 1 is mainly iron loss. Therefore, by means of the second magnetic saturation portion 72, the loss generated in the rotating electrical machine 1 when the rotating electrical machine 1 operates without load can be reduced.

[0132] On the other hand, as shown in FIG. 4, when the rotating electrical machine 1 operates at a high load, a large current is supplied to the stator coil 92 to cause the stator 90 to generate a large magnetic field. At this time, the magnetic flux generated in the magnetization direction of the second permanent magnet 62 cancels out the d-axis linkage magnetic flux generated by the negative d-axis current flowing through the stator coil 92. Therefore, as compared with when the rotating electrical machine 1 operates without load, it decreases. Therefore, even if the second magnetic saturation portion 72 is formed so as to be magnetically saturated when the rotating electrical machine 1 operates without load, it is possible to prevent the second magnetic saturation portion 72 from becoming magnetically saturated when the rotating electrical machine 1 operates at a high load. Therefore, even if the second magnetic saturation portion 72 is formed, the magnetic flux generated in the magnetization direction of the second permanent magnet 62 when the rotating electrical machine 1 operates at a high load is almost the same as the case where the second magnetic saturation portion 72 is not formed, and the rotating electrical machine 1 can suppress a decrease in the maximum output torque during high-load operation.

[0133] In this way, the rotor 10 of the rotating electrical machine 1 can suppress a decrease in the maximum output torque during high-load operation of the rotating electrical machine 1 and can reduce the loss generated in the rotating electrical machine 1 when the rotating electrical machine 1 operates without load and at a low load by forming the second magnetic saturation portion 72 in the second magnet accommodation hole 52. In addition, the second magnetic saturation portion 72 includes a convex portion 72a formed by a part of the rotor core 20 and a gap portion 72b formed between the inner side wall portion 521 of the second magnet accommodation hole 52 and the second permanent magnet 62. Therefore, the second magnetic saturation portion 72 can be easily formed. Moreover, the ratio of the convex portion 72a and the ratio of the gap portion 72b in the second magnetic saturation portion 72 can be easily adjusted. Therefore, the saturation magnetic flux density of the second magnetic saturation portion 72 can be easily adjusted.

[0134] Further, the second magnetic saturation portion 72 includes a convex portion 72a formed by a part of the rotor core 20 protruding from the inner side wall portion 521 of the second magnet receiving hole 52 toward the inner side surface 621 of the second permanent magnet 62, and a gap portion 72b formed between adjacent convex portions 72a. Therefore, by blanking the electromagnetic steel sheet 40 into a desired shape, the second magnetic saturation portion 72 can be formed while suppressing an increase in the manufacturing man-hours of the rotor 10.

[0135] Return Figure 2 , the second magnetic saturation portion 72 has: a main surface 721 extending opposite to the inner side surface 621 of the second permanent magnet 62; and a pair of side surfaces 722 extending from both end portions of the main surface 721 toward the inner side wall portion 521 of the second magnet receiving hole 52 and facing the outside in the extending direction of the second magnetic saturation portion 72. The pair of side surfaces 722 are formed to be exposed inside the second magnet receiving hole 52.

[0136] In the present embodiment, the main surface 721 is formed by the front end surfaces of a plurality of convex portions 72a. Further, the pair of side surfaces 722 are formed by the surfaces of the convex portions 72a formed at both ends in the extending direction of the second magnetic saturation portion 72 and facing the outside in the extending direction of the second magnetic saturation portion 72.

[0137] Moreover, when viewed from the axial direction, in the second magnet receiving hole 52, the second permanent magnet 62 is disposed at a position separated from the wall portion 520 of the second magnet receiving hole 52 at both end portions of the inner side surface 621. In other words, when viewed from the axial direction, in the second magnet receiving hole 52, the second permanent magnet 62 is disposed at a position where it does not contact the inner side wall portion 521, the outer side wall portion 522, the d-axis side wall portion 523d, and the q-axis side wall portion 523q of the second magnet receiving hole 52 at both end portions of the inner side surface 621.

[0138] Therefore, the second magnetic saturation portion 72 is disposed in the magnetic flux barrier region 33 including the first magnet receiving hole 51, the second magnet receiving hole 52, and the third magnet receiving hole 53. In this way, the second magnetic saturation portion 72 is formed at a position avoiding the first q-axis magnetic path 31q and the second q-axis magnetic path 32q.

[0139] Accordingly, the second magnetic saturation portion 72 is disposed at a position where the q-axis interlinking magnetic flux caused by the q-axis current flowing through the stator coil 92 is not reduced. Therefore, the second magnetic saturation portion 72 can be provided while suppressing a decrease in the maximum output torque during high-load operation of the rotating electric machine 1.

[0140] (Third magnetic saturation portion)

[0141] In the third magnet accommodation hole 53, a third magnetic saturation portion 73 is formed at a position facing at least one of the inner side surface 631 and the outer side surface 632 of the third permanent magnet 63. In the present embodiment, the third magnetic saturation portion 73 is formed at a position facing the inner side surface 631 of the third permanent magnet 63. When observed from the axial direction, the third magnetic saturation portion 73 extends facing the surface of the third permanent magnet 63 that faces the third magnetic saturation portion 73, which is the inner side surface 631 of the third permanent magnet 63 in the present embodiment.

[0142] The third magnetic saturation portion 73 has: convex portions 73a, which are formed by a part of the rotor core 20 protruding from the inner side wall portion 531 of the third magnet accommodation hole 53 toward the inner side surface 631 of the third permanent magnet 63, and a plurality of them are formed along the extending direction of the third magnetic saturation portion 73; and gap portions 73b, which are formed between adjacent convex portions 73a, and a plurality of them are formed along the extending direction of the third magnetic saturation portion 73.

[0143] In the present embodiment, the convex portions 73a are bent in a wave shape in the circumferential direction from the inner side wall portion 531 of the third magnet accommodation hole 53 and protrude toward the inner side surface 631 of the third permanent magnet 63.

[0144] In this way, when observed from the axial direction, the third magnetic saturation portion 73 is formed inside the wall portion 530 of the third magnet accommodation hole 53. Moreover, when observed from the axial direction, the third magnetic saturation portion 73 protrudes from the inner side wall portion 531 of the third magnet accommodation hole 53 toward the third permanent magnet 63 and extends facing the inner side surface 631 of the third permanent magnet. Further, the third magnetic saturation portion 73 includes convex portions 73a formed by a part of the rotor core 20 and gap portions 73b formed between the inner side wall portion 531 of the third magnet accommodation hole 53 and the inner side surface 631 of the third permanent magnet 63.

[0145] The third magnetic saturation portion 73 is formed to be magnetically saturated when the rotating electrical machine 1 operates without load. Magnetic saturation means that the magnetic flux density of the magnetic field generated in the magnetization direction of the third permanent magnet 63 approaches the saturation magnetic flux density of the third magnetic saturation portion 73, and the magnetic permeability in the third magnetic saturation portion 73, that is, Figure 11 the slope of the B-H curve shown with the vertical axis as the magnetic flux density B and the horizontal axis as the magnetic field H starts to decrease.

[0146] As described above, the rotor core 20 is formed by laminating a plurality of electromagnetic steel sheets 40 having a substantially ring shape centered on the rotation axis RC in the axial direction. However, since the relative magnetic permeability of the gap portion 73b is lower than the relative magnetic permeability of the electromagnetic steel sheet 40, the saturation magnetic flux density of the third magnetic saturation portion 73 is lower than the saturation magnetic flux density of the portion where the electromagnetic steel sheets 40 are laminated in the axial direction without forming the gap portion in the rotor core 20.

[0147] Therefore, as shown in FIG. 3, the third magnetic saturation portion 73 is more likely to be magnetically saturated than the portion where the electromagnetic steel sheets 40 are stacked axially without forming a void portion. Therefore, it can be configured such that when the rotating electrical machine 1 operates without load, the second q-axis magnetic path 32q of the rotor core 20 does not become magnetically saturated, while the third magnetic saturation portion 73 becomes magnetically saturated.

[0148] Moreover, the third magnetic saturation portion 73 is configured to be magnetically saturated when the rotating electrical machine 1 operates without load. Therefore, when the rotating electrical machine 1 operates without load, the third magnetic saturation portion 73 is magnetically saturated by the magnetic flux generated by the third permanent magnet 63, and the magnetic resistance of the third magnetic saturation portion 73 increases. Compared with the case where the third magnetic saturation portion 73 is not formed, the magnetic flux generated in the magnetization direction of the third permanent magnet 63 decreases.

[0149] When the rotating electrical machine 1 operates without load, the loss generated in the rotating electrical machine 1 is mainly iron loss. Therefore, through the third magnetic saturation portion 73, the loss generated in the rotating electrical machine 1 when the rotating electrical machine 1 operates without load can be reduced.

[0150] On the other hand, as shown in FIG. 4, when the rotating electrical machine 1 operates at a high load, a large current is supplied to the stator coil 92 to generate a large magnetic field in the stator 90. At this time, the magnetic flux generated in the magnetization direction of the third permanent magnet 63 cancels out the d-axis linkage magnetic flux generated by the negative d-axis current flowing through the stator coil 92. Therefore, it is less than when the rotating electrical machine 1 operates without load. Therefore, even if the third magnetic saturation portion 73 is formed to be magnetically saturated when the rotating electrical machine 1 operates without load, the third magnetic saturation portion 73 can be prevented from becoming magnetically saturated when the rotating electrical machine 1 operates at a high load. Therefore, even if the third magnetic saturation portion 73 is formed, the magnetic flux generated in the magnetization direction of the third permanent magnet 63 when the rotating electrical machine 1 operates at a high load is almost the same as the case where the third magnetic saturation portion 73 is not formed, and the rotating electrical machine 1 can suppress the reduction of the maximum output torque during high-load operation.

[0151] In this way, the rotor 10 of the rotating electrical machine 1 can suppress the reduction of the maximum output torque during high-load operation of the rotating electrical machine 1 and can reduce the loss generated in the rotating electrical machine 1 when the rotating electrical machine 1 operates without load and at a low load by forming the third magnetic saturation portion 73 in the third magnet receiving hole 53. In addition, the third magnetic saturation portion 73 includes a convex portion 73a formed by a part of the rotor core 20 and a void portion 73b formed between the inner side wall portion 531 of the third magnet receiving hole 53 and the third permanent magnet 63. Therefore, the third magnetic saturation portion 73 can be easily formed. And, the ratio of the convex portion 73a and the ratio of the void portion 73b in the third magnetic saturation portion 73 can be easily adjusted. Therefore, the saturation magnetic flux density of the third magnetic saturation portion 73 can be easily adjusted.

[0152] Further, the third magnetic saturation portion 73 includes a convex portion 73a formed by a part of the rotor core 20 protruding from the inner side wall portion 531 of the third magnet receiving hole 53 toward the inner side surface 631 of the third permanent magnet 63, and a gap portion 73b formed between adjacent convex portions 73a. Therefore, by blanking the electromagnetic steel sheet 40 into a desired shape, the third magnetic saturation portion 73 can be formed while suppressing an increase in the manufacturing man-hours of the rotor 10.

[0153] Return Figure 2 , the third magnetic saturation portion 73 has: a main surface 731 extending opposite to the inner side surface 631 of the third permanent magnet 63; and a pair of side surfaces 732 extending from both end portions of the main surface 731 toward the inner side wall portion 531 of the third magnet receiving hole 53 and facing the outside in the extending direction of the third magnetic saturation portion 73. The pair of side surfaces 732 are formed to be exposed inside the third magnet receiving hole 53.

[0154] In the present embodiment, the main surface 731 is formed by the front end surfaces of a plurality of convex portions 73a. Further, the pair of side surfaces 732 are formed by the surfaces of the convex portions 73a formed at both ends in the extending direction of the third magnetic saturation portion 73 and facing the outside in the extending direction of the third magnetic saturation portion 73.

[0155] Moreover, when viewed from the axial direction, in the third magnet receiving hole 53, the third permanent magnet 63 is disposed at a position separated from the wall portion 530 of the third magnet receiving hole 53 at both end portions of the inner side surface 631. In other words, when viewed from the axial direction, in the third magnet receiving hole 53, the third permanent magnet 63 is disposed at a position where it does not contact the inner side wall portion 531, the outer side wall portion 532, the d-axis side wall portion 533d, and the q-axis side wall portion 533q of the third magnet receiving hole 53 at both end portions of the inner side surface 631.

[0156] Therefore, the third magnetic saturation portion 73 is disposed in the magnetic flux barrier region 33 including the first magnet receiving hole 51, the second magnet receiving hole 52, and the third magnet receiving hole 53. In this way, the third magnetic saturation portion 73 is formed at a position avoiding the first q-axis magnetic path 31q and the second q-axis magnetic path 32q.

[0157] Thereby, the third magnetic saturation portion 73 is disposed at a position where the q-axis interlinkage magnetic flux caused by the q-axis current flowing through the stator coil 92 is not reduced. Therefore, the third magnetic saturation portion 73 can be provided while suppressing a decrease in the maximum output torque during high-load operation of the rotating electrical machine 1.

[0158] <Maximum output torque - no-load loss characteristic>

[0159] Next, with reference to Figure 5 , the torque - no-load loss characteristic of the rotating electrical machine 1 in the case where the first magnetic saturation portion 71, the second magnetic saturation portion 72, and the third magnetic saturation portion 73 are formed will be described.

[0160] Figure 5 This is a graph showing the maximum output torque - no-load loss characteristics when the proportions of the convex portions 71a, 72a, and 73a formed by a part of the rotor core 20 in the first magnetic saturation portion 71, the second magnetic saturation portion 72, and the third magnetic saturation portion 73 are changed. In addition, in this specification and the like, the proportion of the convex portions 71a, 72a, and 73a in the first magnetic saturation portion 71, the second magnetic saturation portion 72, and the third magnetic saturation portion 73 is sometimes referred to as the duty factor.

[0161] Figure 5 The maximum output torque T0 shown is the maximum output torque of the rotating electric machine 1 when the duty factor is 0%, that is, when the entire area provided with the first magnetic saturation portion 71, the second magnetic saturation portion 72, and the third magnetic saturation portion 73 is a gap.

[0162] The maximum output torque T20 is the maximum output torque of the rotating electric machine 1 when the duty factor is 20%, that is, when the proportion of the convex portions 71a, 72a, and 73a formed by a part of the rotor core 20 in the first magnetic saturation portion 71, the second magnetic saturation portion 72, and the third magnetic saturation portion 73 is 20%.

[0163] The maximum output torque T40 is the maximum output torque of the rotating electric machine 1 when the duty factor is 40%, that is, when the proportion of the convex portions 71a, 72a, and 73a formed by a part of the rotor core 20 in the first magnetic saturation portion 71, the second magnetic saturation portion 72, and the third magnetic saturation portion 73 is 40%.

[0164] The maximum output torque T60 is the maximum output torque of the rotating electric machine 1 when the duty factor is 60%, that is, when the proportion of the convex portions 71a, 72a, and 73a formed by a part of the rotor core 20 in the first magnetic saturation portion 71, the second magnetic saturation portion 72, and the third magnetic saturation portion 73 is 60%.

[0165] The maximum output torque T80 is the maximum output torque of the rotating electric machine 1 when the duty factor is 80%, that is, when the proportion of the convex portions 71a, 72a, and 73a formed by a part of the rotor core 20 in the first magnetic saturation portion 71, the second magnetic saturation portion 72, and the third magnetic saturation portion 73 is 80%.

[0166] The maximum output torque T100 is the maximum output torque of the rotating electric machine 1 when the duty factor is 100%, that is, when the entire area provided with the first magnetic saturation portion 71, the second magnetic saturation portion 72, and the third magnetic saturation portion 73 is the rotor core 20.

[0167] Figure 5The no-load loss LO shown is the loss generated during no-load operation of the rotating electric machine 1 when the duty factor is 0%, that is, when the regions provided with the first magnetic saturation portion 71, the second magnetic saturation portion 72, and the third magnetic saturation portion 73 are all voids.

[0168] The no-load loss L20 is the loss generated during no-load operation of the rotating electric machine 1 when the duty factor is 20%, that is, when the proportion of the convex portions 71a, 72a, and 73a formed by a part of the rotor core 20 in the first magnetic saturation portion 71, the second magnetic saturation portion 72, and the third magnetic saturation portion 73 is 20%.

[0169] The no-load loss L40 is the loss generated during no-load operation of the rotating electric machine 1 when the duty factor is 40%, that is, when the proportion of the convex portions 71a, 72a, and 73a formed by a part of the rotor core 20 in the first magnetic saturation portion 71, the second magnetic saturation portion 72, and the third magnetic saturation portion 73 is 40%.

[0170] The no-load loss L60 is the loss generated during no-load operation of the rotating electric machine 1 when the duty factor is 60%, that is, when the proportion of the convex portions 71a, 72a, and 73a formed by a part of the rotor core 20 in the first magnetic saturation portion 71, the second magnetic saturation portion 72, and the third magnetic saturation portion 73 is 60%.

[0171] The no-load loss L80 is the loss generated during no-load operation of the rotating electric machine 1 when the duty factor is 80%, that is, when the proportion of the convex portions 71a, 72a, and 73a formed by a part of the rotor core 20 in the first magnetic saturation portion 71, the second magnetic saturation portion 72, and the third magnetic saturation portion 73 is 80%.

[0172] The no-load loss L100 is the loss generated during no-load operation of the rotating electric machine 1 when the duty factor is 100%, that is, when the regions provided with the first magnetic saturation portion 71, the second magnetic saturation portion 72, and the third magnetic saturation portion 73 are all the rotor core 20.

[0173] In the present embodiment, the duty factors of the first magnetic saturation portion 71, the second magnetic saturation portion 72, and the third magnetic saturation portion 73 are 20% or more and 60% or less, that is, the proportion of the convex portions 71a, 72a, and 73a formed by a part of the rotor core 20 is 20% or more and 60% or less. More preferably, the duty factors of the first magnetic saturation portion 71, the second magnetic saturation portion 72, and the third magnetic saturation portion 73 are about 40%, that is, the proportion of the convex portions 71a, 72a, and 73a formed by a part of the rotor core 20 is about 40%.

[0174] Thus, as Figure 5As shown, it is possible to further suppress a decrease in the maximum output torque of the rotating electric machine 1 and further reduce losses during no-load operation of the rotating electric machine 1.

[0175] (Modified example)

[0176] As Figure 6 shown, the first magnetic saturation portion 71 may also be formed such that the convex portion 71a protrudes from the inner side wall portion 511 of the first magnet receiving hole 51 toward the inner side surface 611 of the first permanent magnet 61 and is curved into an arc shape protruding toward one end side in the extending direction of the first magnetic saturation portion 71. In addition, although detailed description is omitted, the second magnetic saturation portion 72 and the third magnetic saturation portion 73 may also be formed in the same manner as the first magnetic saturation portion 71, that is, the convex portion 72a protrudes from the inner side wall portion 521 of the second magnet receiving hole 52 toward the inner side surface 621 of the second permanent magnet 62 and is curved into an arc shape protruding toward one end side in the extending direction of the second magnetic saturation portion 72, and the convex portion 73a protrudes from the inner side wall portion 531 of the third magnet receiving hole 53 toward the inner side surface 631 of the third permanent magnet 63 and is curved into an arc shape protruding toward one end side in the extending direction of the third magnetic saturation portion 73.

[0177] [Second Embodiment]

[0178] Next, with reference to Figures 7 to 9 the rotor 10 of the rotating electric machine according to the second embodiment of the present invention will be described. In addition, in the following description, the same reference numerals are given to the same constituent elements as those of the rotor 10 of the rotating electric machine according to the first embodiment, and the description thereof is omitted or simplified. In the rotor 10 of the rotating electric machine according to the second embodiment, the shapes of the first magnetic saturation portion 71, the second magnetic saturation portion 72, and the third magnetic saturation portion 73 are different from those of the rotor 10 of the rotating electric machine according to the first embodiment. Hereinafter, the shape of the first magnetic saturation portion 71 in the rotor 10 of the rotating electric machine according to the second embodiment will be described in detail. In addition, although detailed description is omitted, the second magnetic saturation portion 72 and the third magnetic saturation portion 73 of the rotor 10 of the rotating electric machine according to the second embodiment have the same shape as the first magnetic saturation portion 71 of the rotor 10 of the rotating electric machine according to the second embodiment.

[0179] As Figures 7 to 9 shown, when viewed from the axial direction, the first magnetic saturation portion 71 according to the present embodiment has: a protruding portion 71c formed by a part of the rotor core 20 protruding from the inner side wall portion 511 of the first magnet receiving hole 51 toward the inner side surface 611 of the first permanent magnet 61; and a gap portion 71d formed with a plurality of them inside the protruding portion 71c along the extending direction of the first magnetic saturation portion 71.

[0180] (First Example)

[0181] As Figure 7As shown, when viewed axially, the protrusion 71c of the first magnetic saturation portion 71 according to the first embodiment of the present embodiment includes: convex portions 71e, which are formed by a part of the rotor core 20 protruding from the inner side wall portion 511 of the first magnet receiving hole 51 toward the inner side surface 611 of the first permanent magnet 61 and are formed in a plurality along the extending direction of the first magnetic saturation portion 71; and a main surface portion 71f, which connects the front end portions of the respective convex portions 71e and extends opposite to the inner side surface 611 of the first permanent magnet 61. The convex portion 71e protrudes from the inner side wall portion 511 of the first magnet receiving hole 51 toward the inner side surface 611 of the first permanent magnet 61 and is bent into a waveform in the circumferential direction.

[0182] In the present embodiment, the main surface 711 is formed by the main surface portion 71f. In addition, a pair of side surfaces 712 are formed by the surfaces of the convex portions 71e formed at both ends in the extending direction of the first magnetic saturation portion 71 and facing the outside in the extending direction of the first magnetic saturation portion 71.

[0183] In addition, in the present embodiment, the gap portions 71d are surrounded by two adjacent convex portions 71e, the main surface portion 71f, and the inner side wall portion 511 of the first magnet receiving hole 51, and a plurality of them are formed inside the protrusion 71c.

[0184] (Second Embodiment)

[0185] As Figure 8 shown, when viewed axially, the protrusion 71c of the first magnetic saturation portion 71 according to the second embodiment of the present embodiment includes: convex portions 71g, which are formed by a part of the rotor core 20 protruding from the inner side wall portion 511 of the first magnet receiving hole 51 toward the inner side surface 611 of the first permanent magnet 61 and are formed in a plurality along the extending direction of the first magnetic saturation portion 71; and a main surface portion 71h, which connects the front end portions of the respective convex portions 71g and extends opposite to the inner side surface 611 of the first permanent magnet 61. The convex portion 71g protrudes from the inner side wall portion 511 of the first magnet receiving hole 51 in a substantially linear shape in a direction substantially orthogonal to the inner side surface 611 of the first permanent magnet 61.

[0186] In the present embodiment, the main surface 711 is formed by the main surface portion 71h. In addition, a pair of side surfaces 712 are formed by the surfaces of the convex portions 71g formed at both ends in the extending direction of the first magnetic saturation portion 71 and facing the outside in the extending direction of the first magnetic saturation portion 71.

[0187] In addition, in the present embodiment, the gap portions 71d are surrounded by two adjacent convex portions 71g, the main surface portion 71h, and the inner side wall portion 511 of the first magnet receiving hole 51, and a plurality of them are formed inside the protrusion 71c.

[0188] (Third Embodiment)

[0189] As Figure 9As shown, when viewed axially, the protruding portion 71c of the first magnetic saturation portion 71 according to the third embodiment of the present embodiment is formed by a part of the rotor core 20 protruding from the inner side wall portion 511 of the first magnet receiving hole 51 toward the inner side surface 611 of the first permanent magnet 61, and has a substantially rectangular shape with the extending direction of the first magnetic saturation portion 71 as the long side direction.

[0190] In the present embodiment, the main surface 711 is constituted by the front end surface of the protruding portion 71c facing the inner side surface 611 of the first permanent magnet 61, and the protruding portion 71c has a substantially rectangular shape when viewed axially. When viewed axially, the pair of side surfaces 712 are formed by the side wall surfaces formed at both ends in the extending direction of the first magnetic saturation portion 71.

[0191] In addition, in the present embodiment, the gap portions 71d have a substantially circular shape when viewed axially, and a plurality of them are formed inside the protruding portion 71c along the extending direction of the first magnetic saturation portion 71.

[0192] As shown in the first to third embodiments, the first magnetic saturation portion 71 according to the present embodiment includes: a protruding portion 71c formed by a part of the rotor core 20 protruding from the inner side wall portion 511 of the first magnet receiving hole 51 toward the inner side surface 611 of the first permanent magnet 61; and a plurality of gap portions 71d formed inside the protruding portion 71c along the extending direction of the first magnetic saturation portion 71. Therefore, by punching the electromagnetic steel sheet 40 into a desired shape, the first magnetic saturation portion 71 can be formed while suppressing an increase in the manufacturing man-hours of the rotor 10.

[0193] Moreover, since the gap portions 71d are formed inside the protruding portion 71c, the first magnetic saturation portion 71 can be formed with high rigidity.

[0194] [Third Embodiment]

[0195] Next, with reference to Figure 10 The rotor 10 of the rotating electric machine according to the third embodiment of the present invention will be described. In addition, in the following description, the same reference numerals are given to the same constituent elements as those of the rotor 10 of the rotating electric machine according to the first embodiment, and the description is omitted or simplified. In the rotor 10 of the rotating electric machine according to the third embodiment, the arrangements and shapes of the first magnet receiving hole 51, the second magnet receiving hole 52, and the third magnet receiving hole 53, and the arrangements and shapes of the first permanent magnet 61, the second permanent magnet 6, and the third permanent magnet 63 are different from those of the rotor 10 of the rotating electric machine according to the first embodiment. Hereinafter, the differences between the rotor 10 of the rotating electric machine according to the first embodiment and the rotor 10 of the rotating electric machine according to the third embodiment will be described in detail.

[0196] As Figure 10As shown, in the present embodiment, the first magnet accommodation hole 51 is formed near the outer peripheral surface of the rotor core 20. Further, the second magnet accommodation hole 52 is formed such that the d-axis side end surface 623d of the second permanent magnet 62 is located radially inside the first permanent magnet 61, and the q-axis side end surface 623q of the second permanent magnet 62 is located at substantially the same position as the first permanent magnet 61 in the radial direction. The third magnet accommodation hole 53 is formed such that the d-axis side end surface 633d of the third permanent magnet 63 is located radially inside the first permanent magnet 61, and the q-axis side end surface 633q of the third permanent magnet 63 is located at substantially the same position as the first permanent magnet 61 in the radial direction.

[0197] In the present embodiment, in the magnetic pole portion 30, a first q-axis magnetic path 31q is formed radially outside the first magnet accommodation hole 51, and the q-axis interlinkage magnetic flux generated by the q-axis current flowing through the stator coil 92 passes through the first q-axis magnetic path 31q. Further, in the magnetic pole portion 30, a second q-axis magnetic path 32q is formed in a region radially inside the first magnet accommodation hole 51 and radially outside the second magnet accommodation hole 52 and the third magnet accommodation hole 53, and the q-axis interlinkage magnetic flux generated by the q-axis current flowing through the stator coil 92 passes through the second q-axis magnetic path 32q. Further, a third q-axis magnetic path 35q is formed radially inside the second magnet accommodation hole 52 and the third magnet accommodation hole 53, and the q-axis interlinkage magnetic flux generated by the q-axis current flowing through the stator coil 92 passes through the third q-axis magnetic path 35q.

[0198] In the first q-axis magnetic path 31q, the q-axis interlinkage magnetic flux is bent convexly toward the radially inner side along the outer wall portion 512 of the first magnet accommodation hole 51 and passes through. In the second q-axis magnetic path 32q, the q-axis interlinkage magnetic flux is bent convexly toward the radially inner side along the inner wall portion 511 of the first magnet accommodation hole 51, the outer wall portion 522 of the second magnet accommodation hole 52, and the outer wall portion 532 of the third magnet accommodation hole 53 and passes through. In the third q-axis magnetic path 35q, the q-axis interlinkage magnetic flux is bent convexly toward the radially inner side along the inner wall portion 521 of the second magnet accommodation hole 52 and the inner wall portion 531 of the third magnet accommodation hole 53 and passes through.

[0199] The magnetic flux barrier region 33 formed in the magnetic pole portion 30 has a first magnetic flux barrier region 331 formed between the first q-axis magnetic path 31q and the second q-axis magnetic path 32q, and a second magnetic flux barrier region 332 formed between the second q-axis magnetic path 32q and the third q-axis magnetic path 35q. The first magnetic flux barrier region 331 is a region that includes the first magnet receiving hole 51 and is curved convexly toward the radially inner side along the first q-axis magnetic path 31q and the second q-axis magnetic path 32q. The second magnetic flux barrier region 332 is a region that includes the second magnet receiving hole 52 and the third magnet receiving hole 53 and is curved convexly toward the radially inner side along the second q-axis magnetic path 32q and the third q-axis magnetic path 35q. The first magnetic flux barrier region 331 and the second magnetic flux barrier region 332 are preferably formed so that the q-axis magnetic flux does not pass through as much as possible.

[0200] The first magnetic saturation portion 71 has: a convex portion 71a formed by a part of the rotor core 20 protruding from the inner side wall portion 511 of the first magnet receiving hole 51 toward the inner side surface 611 of the first permanent magnet 61 at a substantially central portion in the extending direction of the inner side wall portion 511 of the first magnet receiving hole 51; and a pair of gap portions 71b formed with the convex portion 71a interposed therebetween. In other words, the pair of gap portions 71b are formed on one side and the other side of the convex portion 71a in the extending direction of the inner side wall portion 511 of the first magnet receiving hole 51.

[0201] The second magnetic saturation portion 72 has: a convex portion 72a formed by a part of the rotor core 20 protruding from the inner side wall portion 521 of the second magnet receiving hole 52 toward the inner side surface 621 of the second permanent magnet 62 at a substantially central portion in the extending direction of the inner side wall portion 521 of the second magnet receiving hole 52; and a pair of gap portions 72b formed with the convex portion 72a interposed therebetween. In other words, the pair of gap portions 72b are formed on one side and the other side of the convex portion 72a in the extending direction of the inner side wall portion 521 of the second magnet receiving hole 52.

[0202] The third magnetic saturation portion 73 has: a convex portion 73a formed by a part of the rotor core 20 protruding from the inner side wall portion 531 of the third magnet receiving hole 53 toward the inner side surface 631 of the third permanent magnet 63 at a substantially central portion in the extending direction of the inner side wall portion 531 of the third magnet receiving hole 53; and a plurality of gap portions 73b formed with the convex portion 73a interposed therebetween. In other words, the plurality of gap portions 73b are formed on one side and the other side of the convex portion 73a in the extending direction of the inner side wall portion 531 of the third magnet receiving hole 53.

[0203] Thus, the first magnetic saturation portion 71, the second magnetic saturation portion 72, and the third magnetic saturation portion 73 can be formed in a simple shape, and thus the first magnetic saturation portion 71, the second magnetic saturation portion 72, and the third magnetic saturation portion 73 can be easily manufactured.

[0204] As described above, the embodiments of the present invention have been described with reference to the accompanying drawings, but the present invention is of course not limited to these embodiments. Obviously, those skilled in the art should understand that various variations or modifications can be conceived within the scope described in the technical solution, and these variations or modifications naturally also belong to the technical scope of the present invention. In addition, within the scope not departing from the gist of the invention, the constituent elements in the above embodiments can also be arbitrarily combined.

[0205] For example, resin may also be filled inside the first magnet housing hole 51 including the gap portion 71b of the first magnetic saturation portion 71. Similarly, resin may also be filled inside the second magnet housing hole 52 including the gap portion 72b of the second magnetic saturation portion 72. Additionally, similarly, resin may also be filled inside the third magnet housing hole 53 including the gap portion 73b of the third magnetic saturation portion 73.

[0206] For example, in the present embodiment, the first magnetic saturation portion 71 is formed on the inner side wall portion 511 of the first magnet housing hole 51, but the first magnetic saturation portion 71 may also be formed on the outer side wall portion 512 of the first magnet housing hole 51, or may be formed on both the inner side wall portion 511 and the outer side wall portion 512 of the first magnet housing hole 51.

[0207] For example, in the present embodiment, the second magnetic saturation portion 72 is formed on the inner side wall portion 521 of the second magnet housing hole 52, but the second magnetic saturation portion 72 may also be formed on the outer side wall portion 522 of the second magnet housing hole 52, or may be formed on both the inner side wall portion 521 and the outer side wall portion 522 of the second magnet housing hole 52.

[0208] For example, in the present embodiment, the third magnetic saturation portion 73 is formed on the inner side wall portion 531 of the third magnet housing hole 53, but the third magnetic saturation portion 73 may also be formed on the outer side wall portion 532 of the third magnet housing hole 53, or may be formed on both the inner side wall portion 531 and the outer side wall portion 532 of the third magnet housing hole 53.

[0209] For example, in the present embodiment, the rotor 10 of the rotating electric machine has the first magnetic saturation portion 71 formed in the first magnet housing hole 51, the second magnetic saturation portion 72 formed in the second magnet housing hole 52, and the third magnetic saturation portion 73 formed in the third magnet housing hole 53, but the rotor 10 of the rotating electric machine only needs to have at least one of the first magnetic saturation portion 71, the second magnetic saturation portion 72, and the third magnetic saturation portion 73. That is, any one or two of the first magnetic saturation portion 71, the second magnetic saturation portion 72, and the third magnetic saturation portion 73 may also be omitted.

[0210] At least the following matters are described in this specification. In parentheses, the corresponding constituent elements, etc. in the above embodiments are shown as an example, but are not limited thereto.

[0211] (1) The rotor (rotor 10) of a rotating electrical machine (rotating electrical machine 1), comprising:

[0212] A rotor core (rotor core 20) having a substantially annular shape centered on a rotation axis (rotation axis RC); and

[0213] A plurality of magnetic pole portions (magnetic pole portions 30) formed on the rotor core in the circumferential direction,

[0214] Each magnetic pole portion has: magnet accommodation holes (first magnet accommodation hole 51, second magnet accommodation hole 52, third magnet accommodation hole 53) formed in the rotor core and extending in the axial direction; and permanent magnets (first permanent magnet 61, second permanent magnet 62, third permanent magnet 63) accommodated in the magnet accommodation holes, wherein,

[0215] The permanent magnet has a first main surface (inner side surfaces 611, 621, 631) extending in the axial direction and a second main surface (outer side surfaces 612, 622, 632) extending in the axial direction,

[0216] The magnet accommodation hole has wall portions (wall portions 510, 520, 530) forming the contour of the magnet accommodation hole as viewed from the axial direction,

[0217] As viewed from the axial direction, at a position on the rotor core facing at least one of the first main surface and the second main surface of the permanent magnet, a saturation portion (first magnetic saturation portion 71, second magnetic saturation portion 72, third magnetic saturation portion 73) that is magnetically saturated during no-load operation of the rotating electrical machine is formed,

[0218] As viewed from the axial direction, the saturation portion includes:

[0219] Core protrusions (protrusions 71a, 72a, 73a, protruding portion 71c) formed by a part of the rotor core extending in a direction intersecting the first main surface or the second main surface between the wall portion of the magnet accommodation hole and at least one of the first main surface and the second main surface of the permanent magnet; and

[0220] Non-magnetic portions (gap portions 71b, 72b, 73b, 71d) formed between the wall portion of the magnet accommodation hole and at least one of the first main surface and the second main surface of the permanent magnet.

[0221] According to (1), in the rotor of a rotating electrical machine, when viewed axially, the saturation portion is composed of a core protrusion and a non-magnetic portion formed between the wall portion of the magnet receiving hole and at least one of the first main surface and the second main surface of the permanent magnet. Therefore, it is possible to suppress a decrease in the maximum output torque during high-load operation of the rotating electrical machine and to reduce the losses generated in the rotating electrical machine during no-load operation. In addition, since the saturation portion is composed of a core protrusion and a non-magnetic portion, the saturation portion can be easily formed.

[0222] (2) The rotor of the rotating electrical machine according to (1), wherein

[0223] When viewed axially, the saturation portion is formed inside the wall portion of the magnet receiving hole.

[0224] A q-axis magnetic path (first q-axis magnetic path 31q, second q-axis magnetic path 32q) is formed outside the magnet receiving hole of each magnetic pole portion, and the q-axis linked magnetic flux of the rotating electrical machine passes through the q-axis magnetic path.

[0225] According to (2), since the saturation portion is formed inside the magnet receiving hole, it is possible to provide the saturation portion at a position avoiding the q-axis magnetic path formed outside the magnet receiving hole of each magnetic pole portion, and thus it is possible to provide the saturation portion while suppressing a decrease in the maximum output torque during high-load operation of the rotating electrical machine.

[0226] (3) The rotor of the rotating electrical machine according to (1) or (2), wherein

[0227] A plurality of core protrusions (protrusions 71a, 72a, 73a) are formed between the wall portion of the magnet receiving hole and at least one of the first main surface and the second main surface of the permanent magnet.

[0228] The non-magnetic portion (gap portions 71b, 72b, 73b) is formed between the plurality of core protrusions.

[0229] According to (3), since a plurality of core protrusions are formed between the wall portion of the magnet receiving hole and at least one of the first main surface and the second main surface of the permanent magnet, and the non-magnetic portion is formed between the plurality of core protrusions, it is possible to form the saturation portion while suppressing an increase in the manufacturing man-hours of the rotor.

[0230] (4) The rotor of the rotating electrical machine according to (1) or (2), wherein

[0231] When viewed axially, the saturation portion is composed of the core protrusion (protrusion 71c) and a plurality of non-magnetic portions (gap portions 71d) formed in the core protrusion.

[0232] According to (4), when viewed axially, the saturation portion is composed of the iron core protrusions and a plurality of non-magnetic portions formed in the iron core protrusions. Therefore, it is possible to form the saturation portion while suppressing an increase in the manufacturing man-hours of the rotor. Further, since the non-magnetic portions are formed in the iron core protrusions, the saturation portion can be formed with high rigidity.

[0233] (5) The rotor of the rotating electrical machine according to (1) or (2), wherein,

[0234] When viewed axially, the saturation portion is composed of the iron core protrusions (protrusions 71a, 72a, 73a) and a plurality of the non-magnetic portions (gap portions 71b, 72b, 73b) formed with the iron core protrusions interposed therebetween.

[0235] According to (5), when viewed axially, the saturation portion is composed of the iron core protrusions and a plurality of non-magnetic portions formed with the iron core protrusions interposed therebetween. Therefore, the saturation portion can be formed in a simple shape. Thereby, the saturation portion can be easily manufactured.

[0236] (6) The rotor of the rotating electrical machine according to any one of (1) to (5), wherein,

[0237] In the saturation portion, the proportion of a part of the rotor core is 20% or more and 60% or less.

[0238] According to (6), in the saturation portion, the proportion of a part of the rotor core is 20% or more and 60% or less. Therefore, it is possible to further suppress a decrease in the maximum output torque of the rotating electrical machine and further reduce the loss during no-load operation of the rotating electrical machine.

[0239] (7) The rotor of the rotating electrical machine according to any one of (1) to (6), wherein,

[0240] When viewed axially, the saturation portion has:

[0241] Main surfaces (main surfaces 711, 721, 731) that extend facing at least one of the first main surface and the second main surface of the permanent magnet; and

[0242] A pair of side surfaces (side surfaces 712, 722, 732) that extend from both end portions of the main surface toward the wall portion of the magnet accommodation hole and face the outside in the extending direction of the saturation portion,

[0243] The pair of side surfaces are formed to be exposed inside the magnet accommodation hole,

[0244] When viewed axially, in the magnet accommodation hole, the permanent magnet is disposed at a position separated from the wall portion of the magnet accommodation hole at both end portions of the first main surface or the second main surface of the permanent magnet.

[0245] According to (7), a pair of side surfaces of the saturation portion are formed to be exposed inside the magnet accommodation hole, and the permanent magnet is disposed at positions separated from the wall portion of the magnet accommodation hole at both ends of the opposed surface when viewed axially in the magnet accommodation hole. Therefore, the saturation portion is disposed at a position where the q-axis interlinkage magnetic flux is not reduced. Thus, it is possible to provide the saturation portion while suppressing a decrease in the maximum output torque during high-load operation of the rotating electric machine.

Claims

1. A rotor of a rotating electrical machine, comprising: A rotor core having a substantially annular shape centered on the rotation axis; and A plurality of magnetic pole portions formed circumferentially on the rotor core, Each magnetic pole portion having: a magnet receiving hole formed in the rotor core and extending in the axial direction; and a permanent magnet received in the magnet receiving hole, wherein The permanent magnet has a first main surface extending in the axial direction and a second main surface extending in the axial direction, The magnet receiving hole has a wall portion forming the contour of the magnet receiving hole as viewed from the axial direction, As viewed from the axial direction, a saturation portion that magnetically saturates during no-load operation of the rotating electrical machine is formed at a position on the rotor core facing at least one of the first main surface and the second main surface of the permanent magnet, As viewed from the axial direction, the saturation portion includes: A core protrusion formed by a part of the rotor core extending in a direction intersecting with the first main surface or the second main surface between the wall portion of the magnet receiving hole and at least one of the first main surface and the second main surface of the permanent magnet; and A non-magnetic portion formed between the wall portion of the magnet receiving hole and at least one of the first main surface and the second main surface of the permanent magnet, As viewed from the axial direction, the saturation portion is composed of the core protrusion and a plurality of the non-magnetic portions formed on the core protrusion.

2. The rotor of the rotating electrical machine according to claim 1, wherein As viewed from the axial direction, The saturation portion is formed inside the wall portion of the magnet receiving hole, A q-axis magnetic path is formed outside the magnet receiving hole of each magnetic pole portion, and the q-axis linked magnetic flux of the rotating electrical machine passes through the q-axis magnetic path.

3. The rotor of the rotating electrical machine according to claim 1 or 2, wherein A plurality of the core protrusions are formed between the wall portion of the magnet receiving hole and at least one of the first main surface and the second main surface of the permanent magnet, The non-magnetic portion is formed between the plurality of core protrusions.

4. The rotor of the rotating electrical machine according to claim 1 or 2, wherein As viewed from the axial direction, the saturation portion is composed of the core protrusion and a plurality of the non-magnetic portions formed with the core protrusion interposed therebetween.

5. The rotor of the rotating electrical machine according to claim 1 or 2, wherein As viewed from the axial direction, the saturation portion has: A main surface extending facing at least one of the first main surface and the second main surface of the permanent magnet; and A pair of side surfaces extending from both end portions of the main surface toward the wall portion of the magnet receiving hole and facing the outside of the extending direction of the saturation portion, The pair of side surfaces are formed to be exposed inside the magnet receiving hole, As viewed from the axial direction, in the magnet receiving hole, the permanent magnet is disposed at a position where both end portions of the first main surface or the second main surface of the permanent magnet are separated from the wall portion of the magnet receiving hole.

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