JP7162777B1 - Rotating electric machine and aircraft equipped with the rotating electric machine - Google Patents

Abstract

In a rotating electric machine having a double rotor structure, leakage magnetic flux in a stator is reduced to suppress loss. A rotating electric machine having an annular stator, an inner rotor, and an outer rotor. ), and an outer annular core member (5) and an inner annular core member (6) respectively fastened to the outer peripheral side and the inner peripheral side of a plurality of tooth members, the outer peripheral annular core member has an outer peripheral side thin portion having a smaller radial thickness than other portions at the outer peripheral portion of the slot (18), and the inner peripheral side annular core member has a radial thickness at the inner peripheral portion of the slot (18). has an inner peripheral thin portion that is smaller than the portion of

Description

TECHNICAL FIELD The present application relates to a rotating electric machine and an aircraft equipped with the rotating electric machine.

2. Description of the Related Art There is known a rotary electric machine with a double rotor structure, which is being developed with the aim of being applied to an electric aircraft. 2. Description of the Related Art As a conventional stator for a rotating electric machine having a double rotor structure, there is a stator in which a plurality of tooth members wound with coils are arranged in an annular shape. In this stator, the tooth member is fixed by two annular iron core members arranged respectively on the outer peripheral side and the inner peripheral side of the tooth member (see, for example, Patent Document 1).

Japanese Patent Application Laid-Open No. 2005-237191

However, in the conventional stator of a rotary electric machine having a double rotor structure, since the radial thickness of the annular iron core member at the position of the slot is constant in the circumferential direction, there is a problem that leakage flux is large and loss is large. rice field.

SUMMARY OF THE INVENTION The present invention has been made to solve the problems described above, and an object of the present invention is to provide a rotating electric machine having a dual rotor structure in which leakage flux in the stator is reduced to suppress loss.

The rotary electric machine of the present application includes a ring-shaped stator, an inner rotor disposed on the inner peripheral side of the stator with a gap therebetween, and a magnet disposed on the outer peripheral side of the stator with a gap therebetween and integrated with the inner rotor. and an outer rotor rotatable with respect to the stator . The stator includes a plurality of tooth members that are annularly spaced apart, a plurality of coils that are respectively wound around the plurality of tooth members, and a stator that is fastened to the outer peripheral side and the inner peripheral side of the plurality of tooth members, respectively. An outer annular core member and an inner annular core member are provided, and the outer annular core member and the inner annular core member are provided between a plurality of tooth members that are annularly spaced apart from each other. The space sandwiched between the two is a slot, and the outer peripheral side annular core member has an outer peripheral side thin portion whose thickness in the radial direction is smaller than the other portion on the outer peripheral wall of the slot, and the inner peripheral side annular core member The member has an outer thin portion on the outer peripheral wall and an inner thin portion on the inner peripheral wall of the slot whose thickness in the radial direction is smaller than that of other portions, and the inner thin portion on the inner peripheral annular core member. is greater than the thickness of the outer peripheral thin portion of the outer annular core member.

In the rotating electric machine of the present application, the outer ring-shaped core member has an outer thin-walled portion on the outer wall of the slot whose thickness in the radial direction is smaller than that of other portions, and the inner ring-shaped core member has a thinner portion on the outer wall of the slot. The inner peripheral wall of the slot having the outer peripheral thin portion has an inner peripheral thin portion whose thickness in the radial direction is smaller than that of other portions, and the thickness of the inner peripheral thin portion of the inner peripheral annular core member is Since the thickness is greater than the thickness of the thin portion on the outer peripheral side of the outer annular core member, it is possible to reduce leakage magnetic flux in the stator and suppress loss.

1 is a schematic cross-sectional view of a rotating electric machine according to Embodiment 1; FIG. 1 is a schematic cross-sectional view of a rotating electric machine according to Embodiment 1; FIG. 4 is a perspective view of a tooth member around which a coil according to Embodiment 1 is wound; FIG. 3 is a perspective view of an outer annular core member and an inner annular core member according to Embodiment 1. FIG. 2 is an exploded view of the stator according to Embodiment 1. FIG. 2 is an enlarged cross-sectional view of the stator according to Embodiment 1; FIG. 4 is an enlarged perspective view of a second stator holding member according to Embodiment 1; FIG. FIG. 4 is a perspective view showing a state in which an outer annular core member is attached to a second stator holding member in Embodiment 1; FIG. 4 is a perspective view showing a state in which an outer circumferential annular core member and tooth members are attached to a second stator holding member in Embodiment 1; FIG. 4 is an exploded assembly view showing a state in which a first stator holding member and a second stator holding member are attached to the stator in Embodiment 1; FIG. 4 is an explanatory diagram showing magnetic flux generated from an outer rotor magnet in Embodiment 1; FIG. 5 is an explanatory diagram showing an example of the relationship between the ratio of the thickness of the inner peripheral side thin portion to the thickness of the outer peripheral side thin portion and the interlinkage magnetic flux in Embodiment 1; FIG. 7 is a schematic cross-sectional view of a rotating electric machine according to Embodiment 2; FIG. 11 is a perspective view of a tooth member according to Embodiment 3; FIG. 11 is a perspective view of an outer circular ring-shaped core member and an inner ring-shaped core member according to Embodiment 3; FIG. 11 is an exploded assembly view of a stator according to Embodiment 3; FIG. 11 is an enlarged cross-sectional view of a stator according to Embodiment 4; FIG. 11 is an explanatory diagram of an airplane according to Embodiment 5; FIG. 11 is an explanatory diagram of a multicopter according to Embodiment 6; FIG. 11 is an explanatory diagram of a multicopter according to Embodiment 6;

A rotating electric machine and an aircraft according to embodiments for carrying out the present application will be described below in detail with reference to the drawings. In each figure, the same reference numerals denote the same or corresponding parts.

Embodiment 1.
FIG. 1 is a schematic cross-sectional view of a rotating electric machine according to Embodiment 1. FIG. FIG. 1 is a schematic cross-sectional view in a direction parallel to the rotation axis of a rotating electric machine. The rotating electrical machine of the present embodiment is a rotating electrical machine with a dual rotor structure. As shown in FIG. 1 , a rotating electric machine 100 of the present embodiment includes a stator 1 having an annular shape, an inner rotor 2 arranged on the inner peripheral side of the stator 1 with a gap therebetween, and a gap on the outer peripheral side of the stator 1 . It has an outer rotor 3 arranged via and a rotating shaft 14 . Both ends of the stator 1 in the axial direction are held by a first stator holding member 11 and a second stator holding member 12, respectively. The stator 1 is fastened to the rotary electric machine cover 15 via the second stator holding member 12 . The inner rotor 2 is fastened to the rotating shaft 14 . The outer rotor 3 is fastened to the rotating shaft 14 via the outer rotor cover 10 . The rotary shaft 14 is rotatably arranged on the rotary electric machine cover 15 via the bearing 13 .

In FIG. 1, arrow Z indicates the axial direction of the rotating shaft 14, and arrow R indicates the radial direction of the rotating shaft. In the specification of the present application, the axial direction of the rotating shaft 14 is hereinafter simply referred to as the "axial direction", the radial direction of the rotating shaft 14 is simply referred to as the "radial direction", and the rotating direction of the rotating shaft 14 is simply referred to as the "circumferential direction".

The stator 1 includes a plurality of tooth members 4 arranged in an annular shape, coils 7 wound around the respective tooth members 4, and outer annular iron cores respectively arranged on the outer peripheral side and the inner peripheral side of the tooth members 4. It has a member 5 and an inner peripheral annular core member 6 . Axial ends of the outer ring-shaped core member 5 and the inner ring-shaped core member 6 extend axially outward beyond the axial ends of the teeth members 4 around which the coils 7 are wound. . One axial end of each of the outer annular core member 5 and the inner annular core member 6 is fastened to the first stator holding member 11 . The other axial ends of the outer annular core member 5 and the inner annular core member 6 are fastened to the second stator holding member 12 . The rotary shaft 14 is rotatably arranged on the first stator holding member 11 via the bearing 13 . Therefore, in rotating electric machine 100 of the present embodiment, inner rotor 2 , outer rotor 3 and rotating shaft 14 are integrally rotatable with respect to stator 1 and rotating electric machine cover 15 .

The inner rotor 2, the outer rotor 3, and the tooth members 4 are made of a magnetic material such as laminated electromagnetic steel plates. The outer ring-shaped core member 5 and the inner ring-shaped core member 6 are made of a magnetic material such as laminated magnetic steel sheets, iron, and ferrite, for example. The outer rotor cover 10 and the rotary electric machine cover 15 are made of non-magnetic material such as aluminum alloy or stainless steel.

A method of fastening the outer annular core member 5 and the inner annular core member 6 to the first stator holding member 11 and the second stator holding member 12, and a fastening method of the second stator holding member 12 and the rotary electric machine cover 15. , the method of fastening the inner rotor 2 and the rotating shaft 14, the method of fastening the outer rotor 3 and the outer rotor cover 10, the method of fastening the outer rotor cover 10 and the rotating shaft 14, etc. method can be used.

FIG. 2 is a schematic cross-sectional view of the rotating electric machine according to the present embodiment. FIG. 2 is a schematic cross-sectional view at the position indicated by AA in FIG. In FIG. 2, the outer rotor cover 10 and the rotary electric machine cover 15 are omitted. The stator 1 includes a plurality of tooth members 4 annularly spaced apart from each other around a rotating shaft 14 , coils 7 wound around the respective tooth members 4 , and coils 7 on the outer and inner peripheral sides of the tooth members 4 . It has an outer peripheral side annular core member 5 and an inner peripheral side annular core member 6 which are respectively arranged. In the rotary electric machine 100 of the present embodiment, 24 tooth members 4 are annularly spaced apart from each other. The coil 7 is concentrically wound around the tooth member 4 by concentrated winding. Spaces between the plurality of tooth members 4 spaced apart form slots 18 .

The inner rotor 2 has an annular inner rotor core 8 and 32 inner rotor magnets 16 embedded in the inner rotor core 8 . In the inner rotor 2, a set of two inner rotor magnets 16 arranged in a V shape constitutes one pole, and the poles are arranged at equal pitches in the circumferential direction. A pair of inner rotor magnets 16 are arranged in a V shape that opens toward the outer circumference.

The outer rotor 3 has an annular outer rotor core 9 and 16 outer rotor magnets 17 fixed to the inner peripheral surface of the outer rotor core 9 . The outer rotor magnet 17 is provided to face the stator 1 with a gap therebetween. The outer rotor magnet 17 is fixed to the inner peripheral surface of the outer rotor core 9 with an adhesive, for example. The inner rotor magnets 16 are arranged to have north and south poles in the circumferential direction. The outer rotor magnets 17 are arranged so as to have S poles and N poles in the circumferential direction. Furthermore, the inner rotor magnets 16 and the outer rotor magnets 17 are arranged in phase around the rotating shaft 14 .

FIG. 3 is a perspective view of a tooth member around which a coil is wound according to the present embodiment. The tooth member 4 has a rod-like structure elongated in the axial direction. A coil 7 is wound around the tooth member 4 via an insulating member 19 . Groove-like fitting recesses 4a parallel to the axial direction are formed at both ends of the tooth member 4 in the radial direction. The cross-sectional shape of the fitting recess 4a tapers outward to narrow the width of the opening.

FIG. 4 is a perspective view of an outer annular core member and an inner annular core member according to the present embodiment. A ridge-shaped fitting protrusion 5 a parallel to the axial direction is formed on the inner peripheral side of the outer peripheral annular core member 5 . Further, on the outer peripheral side of the inner peripheral annular core member 6, a ridge-like fitting protrusion 6a parallel to the axial direction is formed. The cross-sectional shape of the fitting protrusion 5a and the fitting protrusion 6a widens toward the outside. Twenty-four fitting protrusions 5a and twenty-four fitting protrusions 6a are formed at equal pitches in the circumferential direction. When the tooth member 4 around which the coil 7 is wound is inserted axially between the outer ring-shaped core member 5 and the inner ring-shaped core member 6, the fitting recesses 4a at both ends of the tooth member 4 are inserted. , the fitting protrusion 5a of the outer peripheral annular core member 5 and the fitting protrusion 6a of the inner peripheral annular core member 6, respectively.

Further, as shown in FIG. 4, on the inner peripheral side of the outer annular core member 5, a groove-shaped inner peripheral recessed portion 5b parallel to the axial direction is formed at a position serving as the outer peripheral wall of the slot. Further, on the outer peripheral side of the inner peripheral annular core member 6, a groove-shaped outer peripheral recess 6b parallel to the axial direction is formed at a position that serves as the inner peripheral wall of the slot. The cross-sectional shapes of the inner peripheral recess 5b and the outer peripheral recess 6b are rectangular. Twenty-four inner peripheral recesses 5b and twenty-four outer peripheral recesses 6b are formed at equal pitches in the circumferential direction. The radial thickness of the outer annular core member 5 on the outer peripheral wall of the slot 18 is the smallest at the position where the inner peripheral recess 5b is formed. In addition, the radial thickness of the inner annular core member 6 on the inner peripheral wall of the slot 18 is the smallest at the position where the outer peripheral recess 6b is formed. In other words, the inner peripheral recessed portion 5b is an outer peripheral thin portion of the slot 18 in which the thickness of the outer peripheral wall is smaller than that of other portions. Further, the outer peripheral recess 6b is an inner peripheral thin portion in which the thickness of the inner peripheral wall of the slot 18 is smaller than that of other portions.

FIG. 5 is an exploded view of the stator according to this embodiment. As shown in FIG. 5, the stator 1 is assembled by axially inserting the tooth member 4 around which the coil 7 is wound between the outer annular core member 5 and the inner annular core member 6 . At this time, the fitting recesses 4a at both ends of the tooth member 4 are fitted to the fitting projections 5a of the outer circumferential annular core member 5 and the fitting projections 6a of the inner circumferential annular core member 6, respectively. Therefore, the tooth members 4 are accurately positioned in the circumferential direction, and the tooth members 4 are firmly fastened to the outer circumferential annular core member 5 and the inner circumferential annular core member 6 .

FIG. 6 is an enlarged sectional view of the stator in this embodiment. As shown in FIG. 6, the fitting recesses 4a at both end portions of the teeth member 4 are fitted to the fitting projections 5a of the outer circumferential annular core member 5 and the fitting projections 6a of the inner circumferential annular core member 6, respectively. mated. An inner peripheral recess 5 b of the outer annular core member 5 is arranged on the outer peripheral wall of the slot 18 . An outer recessed portion 6 b of the inner annular core member 6 is arranged on the inner peripheral wall of the slot 18 .

FIG. 7 is an enlarged perspective view of the second stator holding member in this embodiment. The second stator holding member 12 is made of a non-magnetic material such as an aluminum alloy. As shown in FIG. 7, the annular second stator holding member 12 has a positioning protrusion 12a that protrudes in a direction parallel to the axial direction. The positioning protrusions 12 a are arranged in two rows in the radial direction of the second stator holding member 12 and are arranged side by side in the circumferential direction. The positioning projections 12 a on the outer peripheral side are positioned between the fitting projections 5 a of the outer annular core member 5 when the outer annular core member 5 is attached to the second stator holding member 12 . are placed. In addition, the positioning protrusions 12 a on the inner peripheral side are positioned between the fitting protrusions 6 a of the inner peripheral annular core member 6 when the inner peripheral annular core member 6 is attached to the second stator holding member 12 . It is arranged to be located in The second stator holding member 12 is formed with a draw-out port 12b for drawing out a connection cord electrically connected to the coil 7 or for drawing out an end portion of the coil 7. As shown in FIG.

FIG. 8 is a perspective view showing a state where the outer peripheral annular core member is attached to the second stator holding member. As shown in FIG. 8, the fitting protrusion 5a of the outer circumferential annular core member 5 is fitted into the outer positioning protrusion 12a of the second stator holding member 12 and fixed. Also, although not shown, the fitting protrusion 6a of the inner peripheral annular core member 6 is fitted into the positioning protrusion 12a on the inner peripheral side of the second stator holding member 12 and fixed. In this manner, the outer annular core member 5 and the inner annular core member 6 are accurately positioned in the circumferential direction and fixed to the second stator holding member 12 .

FIG. 9 is a perspective view showing a state in which the outer circumferential annular core member and the tooth member are attached to the second stator holding member. As shown in FIG. 9, after the outer annular core member 5 is fixed to the second stator holding member 12, the tooth member 4 around which the coil 7 is wound is axially inserted. The axial position of the teeth member 4 is determined when the ends of the tooth members 4 come into contact with the positioning projections 12 a of the second stator holding member 12 . That is, the positioning projections 12 a provided on the second stator holding member 12 regulate the positions of the outer annular core member 5 and the inner annular core member 6 in the circumferential direction, and also regulate the axial positions of the teeth members 4 . regulate the position of

FIG. 10 is an assembly exploded view showing a state in which the first stator holding member and the second stator holding member are attached to the stator. The first stator holding member 11 is made of a non-magnetic material such as an aluminum alloy. As shown in FIG. 10, the first stator holding member 11, like the second stator holding member 12, is provided with a positioning protrusion 11a protruding in a direction parallel to the axial direction. The positioning protrusions 11a are arranged in two rows in the radial direction of the first stator holding member 11 and are arranged side by side in the circumferential direction. Similarly to the positioning protrusions 12a provided on the second stator holding member 12, the positioning protrusions 11a provided on the first stator holding member 11 are also positioned on the outer peripheral side annular core member 5 and the inner peripheral side annular core member 6. and regulates the axial position of the tooth member 4 . As shown in FIG. 10, the first stator holding member 11 and the second stator holding member 12 are axially inserted into the stator 1 . A bearing insertion hole 11b is formed in the center of the first stator holding member 11 for rotatably supporting the rotating shaft via a bearing.

In the rotating electrical machine 100 configured as described above, the inner rotor magnet 16 is embedded in the inner rotor core 8, so the spatial harmonic magnetic flux generated near the gap between the stator 1 and the inner rotor 2 is generated by the inner rotor magnet. 16 can be prevented. Therefore, eddy current loss generated in the inner rotor magnet 16 can be reduced. In addition, since the inner rotor magnets 16 are embedded in the inner rotor core 8, it is possible to prevent the inner rotor magnets 16 from coming off due to centrifugal force.

Further, in rotating electric machine 100 of the present embodiment, positioning protrusions provided on first stator holding member 11 and second stator holding member 12 are used to rotate outer peripheral annular core member 5 and inner peripheral annular core member 6 . and axial positioning of the tooth member 4 can be performed. Furthermore, the teeth members 4 can be positioned in the circumferential direction by the fitting projections provided on the outer peripheral side annular core member 5 and the inner peripheral side annular core member 6 and the fitting recesses provided on the teeth members. can. Therefore, the assembly accuracy of the stator 1 is improved, and the strength of the stator 1 is also improved.

Furthermore, in the rotating electric machine 100 of the present embodiment, as shown in FIG. 6, the outer peripheral side annular core member 5 has an outer peripheral side thin portion having a radial thickness smaller than that of other portions on the outer peripheral portion of the slot 18 . In addition, the inner peripheral annular core member 6 has an inner peripheral thin portion in the inner peripheral portion of the slot 18 whose thickness in the radial direction is smaller than that of other portions. A portion of the annular core member having a small radial thickness is magnetically saturated with a small amount of magnetic flux, and the magnetic permeability is lowered. Therefore, in rotary electric machine 100 of the present embodiment, leakage magnetic flux in the annular core member can be reduced to suppress loss.

FIG. 11 is an explanatory diagram showing the magnetic flux generated from the outer rotor magnet 17 in the rotary electric machine 100 of this embodiment. It can be seen from FIG. 11 that the inner circumferential annular core member 6 functions as a magnetic flux path for the magnetic flux generated from the outer rotor magnet 17 . Similarly, in rotating electric machine 100 of the present embodiment, outer annular core member 5 functions as a magnetic flux path for magnetic flux generated from inner rotor magnet 16 . Thus, in rotating electric machine 100 of the present embodiment, inner annular core member 6 functions as a magnetic flux path for magnetic flux generated from outer rotor magnet 17, and outer annular core member 5 functions as an inner rotor magnet. Since it functions as a magnetic flux path for the magnetic flux generated from 16, the amount of magnetic flux interlinking with coil 7 increases, and the output of rotating electric machine 100 improves.

Let T1 be the thickness of the inner peripheral side thin portion of the inner peripheral side annular core member 6, T2 be the thickness of the outer peripheral side thin portion of the outer peripheral side annular core member 5, and T1/T2 be X. FIG. 12 is an explanatory diagram showing an example of the relationship between X and the interlinkage magnetic flux that interlinks the coil 7 of the stator 1. In FIG. In FIG. 12 , the interlinking magnetic flux is the interlinking magnetic flux due to the inner rotor magnet 16 and the outer rotor magnet 17 . The vertical axis in FIG. 12 is relative to the magnetic flux linkage that interlinks the coil 7 when the stator 1 does not include the outer ring-shaped core member 5 and the inner ring-shaped core member 6. value. As shown in FIG. 12, when X is 1 or more, that is, the thickness T1 of the inner peripheral thin portion of the inner peripheral annular core member 6 is equal to or greater than the thickness T2 of the outer peripheral thin portion of the outer annular core member 5. If there is, the interlinkage magnetic flux linking the coil 7 is increased. As a result, the output of rotating electric machine 100 can be further improved.

Embodiment 2.
In the rotary electric machine according to Embodiment 1, the outer rotor magnet is fixed to the inner peripheral surface of the outer rotor core. In the rotating electric machine according to Embodiment 2, the outer rotor magnets are embedded in the outer rotor core. The configuration of the rotating electrical machine of the present embodiment is the same as that of the rotating electrical machine of the first embodiment except for the configuration of the outer rotor.

FIG. 13 is a schematic cross-sectional view of the rotary electric machine according to this embodiment. FIG. 13 is a schematic cross-sectional view in a direction perpendicular to the rotation axis. In FIG. 13, the outer rotor cover and rotating electric machine cover are omitted. As shown in FIG. 13 , the outer rotor 3 has an annular outer rotor core 9 and 32 outer rotor magnets 17 embedded in the outer rotor core 9 . In the rotating electrical machine 100 of the present embodiment, a pair of outer rotor magnets 17 arranged in a V-shape constitutes one pole, and the poles are arranged at equal pitches in the circumferential direction. . A pair of outer rotor magnets 17 are arranged in a V shape that opens toward the inner circumference.

In the rotating electric machine 100 configured as described above, the outer rotor magnets 17 are embedded in the outer rotor core 9, so the spatial harmonic magnetic flux generated near the gap between the stator 1 and the outer rotor 3 is generated by the outer rotor magnets. 17 can be prevented. Therefore, eddy current loss generated in the outer rotor magnets 17 can be reduced. Further, since the outer rotor magnets 17 are embedded in the outer rotor core 9, it is possible to prevent the outer rotor magnets 17 from coming off due to centrifugal force.

Further, in the rotating electric machine 100 of the present embodiment, as in the first embodiment, the thin outer peripheral portion of the outer annular core member 5 is located on the outer peripheral side of the slot, and the inner annular core member The inner peripheral thin portion of 6 is located on the inner peripheral side of the slot. Therefore, it is possible to reduce the leakage magnetic flux in the annular core member and suppress the loss.

Embodiment 3.
The rotating electric machine according to the third embodiment is obtained by changing the shapes of the teeth members, the outer circular ring-shaped core member, and the inner ring-shaped core member in the rotating electric machine shown in the first embodiment. The configuration of the rotating electrical machine of the present embodiment is the same as the configuration of the rotating electrical machine of the first embodiment, except for the configuration of the teeth members, the outer circumferential annular core member, and the inner circumferential annular core member.

FIG. 14 is a perspective view of a tooth member according to this embodiment. Ridge-like fitting protrusions 4b parallel to the axial direction are formed at both ends of the tooth member 4 in the radial direction. The cross-sectional shape of the fitting protrusion 4b widens toward the outside.

FIG. 15 is a perspective view of an outer annular core member and an inner annular core member according to the present embodiment. A groove-shaped fitting recess 5c parallel to the axial direction is formed on the inner peripheral side of the outer peripheral annular core member 5 . A groove-shaped fitting recess 6 c parallel to the axial direction is formed on the outer peripheral side of the inner peripheral annular core member 6 . The cross-sectional shapes of the fitting recess 5c and the fitting recess 6c taper outward to narrow the width of the opening. 24 fitting recesses 5c and 24 fitting recesses 6c are formed at equal pitches in the circumferential direction. When the tooth member 4 around which the coil 7 is wound is inserted axially between the outer ring-shaped core member 5 and the inner ring-shaped core member 6, the fitting protrusions 4b at both ends of the tooth member 4 are inserted. are fitted into the fitting recess 5c of the outer peripheral annular core member 5 and the fitting recess 6c of the inner peripheral annular core member 6, respectively.

Further, as shown in FIG. 15, on the inner peripheral side of the outer annular core member 5, a groove-shaped inner peripheral recessed portion 5b parallel to the axial direction is formed at a position serving as the outer peripheral wall of the slot. Further, on the outer peripheral side of the inner peripheral annular core member 6, a groove-shaped outer peripheral recess 6b parallel to the axial direction is formed at a position that serves as the inner peripheral wall of the slot. The cross-sectional shapes of the inner peripheral recess 5b and the outer peripheral recess 6b are rectangular. Twenty-four inner peripheral recesses 5b and twenty-four outer peripheral recesses 6b are formed at equal pitches in the circumferential direction. That is, the inner peripheral side recess 5 b is the outer peripheral side thin portion of the outer peripheral side annular core member 5 , and the outer peripheral side recess 6 b is the inner peripheral side thin portion of the inner peripheral side annular core member 6 .

FIG. 16 is an exploded view of the stator according to this embodiment. As shown in FIG. 16, the stator 1 is assembled by axially inserting the tooth member 4 around which the coil 7 is wound between the outer annular core member 5 and the inner annular core member 6 . At this time, the fitting projections 4b on both ends of the tooth member 4 are fitted into the fitting recesses 5c of the outer circumferential annular core member 5 and the fitting recesses 6c of the inner circumferential annular core member 6, respectively.

In the stator 1 configured as described above, the tooth member 4, the outer circumferential annular core member 5, and the inner circumferential annular core member 6 are fitted to the fitting projections in the same manner as in the stator of the first embodiment. It is firmly fastened by fitting with the concave portion.

Further, in the rotating electric machine 100 of the present embodiment, as in the first embodiment, the outer thin portion of the outer circumferential annular core member 5 is located on the outer circumferential side of the slot, and the inner circumferential annular core member 6 is located on the outer peripheral side of the slot. is located on the inner peripheral side of the slot. Therefore, it is possible to reduce the leakage magnetic flux in the annular core member and suppress the loss.

Embodiment 4.
The rotary electric machine according to the fourth embodiment is different from the rotary electric machine shown in the first embodiment in the shape of the inner peripheral side recess and the outer peripheral side recess formed in the outer peripheral side annular core member and the inner peripheral side annular core member, respectively. It has been changed. The configuration of the rotating electrical machine of the present embodiment is the same as that of the rotating electrical machine of the first embodiment, except for the shapes of the inner peripheral recess and the outer peripheral recess.

FIG. 17 is an enlarged sectional view of the stator in this embodiment. As shown in FIG. 17, the fitting recesses 4a at both end portions of the tooth member 4 are fitted to the fitting projections 5a of the outer circumferential annular core member 5 and the fitting projections 6a of the inner circumferential annular core member 6, respectively. mated. An inner peripheral recess 5 b of the outer annular core member 5 is arranged on the outer peripheral wall of the slot 18 . An outer recessed portion 6 b of the inner annular core member 6 is arranged on the inner peripheral wall of the slot 18 . In the rotary electric machine of Embodiment 1, the cross-sectional shapes of the inner peripheral recess and the outer peripheral recess are rectangular. In the rotating electrical machine of the present embodiment, as shown in FIG. 17, the cross-sectional shapes of the inner peripheral side recess 5b and the outer peripheral side recess 6b are circular arc shapes. The radial thickness of the outer annular core member 5 on the outer peripheral wall of the slot 18 is the smallest at the position where the inner peripheral recess 5b is formed. In addition, the radial thickness of the inner annular core member 6 on the inner peripheral wall of the slot 18 is the smallest at the position where the outer peripheral recess 6b is formed. That is, the inner peripheral side recess 5 b is the outer peripheral side thin portion of the outer peripheral side annular core member 5 , and the outer peripheral side recess 6 b is the inner peripheral side thin portion of the inner peripheral side annular core member 6 .

In the rotating electric machine configured in this manner, the thin outer wall portion of the outer annular core member 5 is located on the outer peripheral side of the slot 18, and the inner annular core member 6 is located on the outer peripheral side of the slot 18, as in the first embodiment. The inner thin portion is positioned on the inner peripheral side of the slot 18 . Therefore, it is possible to reduce the leakage magnetic flux in the annular core member and suppress the loss.

Embodiment 5.
18 is an explanatory diagram of an airplane according to Embodiment 5. FIG. Airplane 200 of the present embodiment is a fixed-wing aircraft equipped with rotary electric machine 100 described in the first to fourth embodiments. As shown in FIG. 18, in an airplane 200 of the present embodiment, an engine 220 driven by liquid fuel and the rotary electric machine 100 described in Embodiments 1 to 4 are installed inside an engine case 210. . Rotating electric machine 100 is driven by a battery (not shown) mounted on airplane 200 . Engine 220, rotating electric machine 100, and propulsion fan 230 are connected by a shaft. Propulsion fan 230 rotates using engine 220 and rotating electric machine 100 as driving force sources. Gears for converting the rotation speed may be mounted between the propulsion fan 230 and the rotating electrical machine 100 and between the engine 220 and the rotating electrical machine 100, or both. Further, in airplane 200 of the present embodiment, engine 220, rotating electric machine 100, and propulsion fan 230 are arranged coaxially with a shaft. As another configuration, engine 220, rotating electric machine 100, and propulsion fan 230 may be arranged on different axes via gears or the like.

In this rotating electric machine, the positioning projections provided on the first stator holding member and the second stator holding member position the outer annular core member and the inner annular core member in the circumferential direction and position the teeth members in the axial direction. can be positioned. Furthermore, the teeth members can be positioned in the circumferential direction by the fitting protrusions and fitting recesses provided on the outer and inner annular core members and the teeth members, respectively. Therefore, the assembling accuracy of the stator is improved, and the strength of the stator is also improved. By applying this rotating electric machine to the driving force source of the propulsion device of an airplane, a highly reliable electric airplane can be realized.

Further, in this rotating electric machine, the outer thin portion of the outer annular core member is located on the outer peripheral side of the slot, and the inner thin portion of the inner annular core member is located on the inner peripheral side of the slot. Therefore, it is possible to reduce the leakage magnetic flux in the annular core member and suppress the loss. Furthermore, the outer ring-shaped core member functions as a magnetic flux path for the magnetic flux generated from the inner rotor magnet, and the inner ring-shaped core member functions as a magnetic flux path for the magnetic flux generated from the outer rotor magnet, contributing to output. The amount of magnetic flux can be increased. As a result, this rotating electric machine can obtain a high torque output, so that the cruising distance per unit fuel of an airplane equipped with this rotating electric machine can be extended.

In the airplane of the present embodiment, both the engine and the rotating electric machine are provided as driving force sources for the propulsion fan, but only the rotating electric machine may be used as the driving force source.

Embodiment 6.
FIG. 19 is an explanatory diagram of a multicopter according to Embodiment 6. FIG. A multicopter 300 of the present embodiment is a rotorcraft equipped with the rotary electric machine 100 described in the first to fourth embodiments. As shown in FIG. 19, the multicopter 300 of the present embodiment includes four propulsion fans 310, four rotating electrical machines 100 that respectively drive the four propulsion fans 310, and four rotating electrical machines 100 that respectively control the four rotating electrical machines 100. and a battery 330 that supplies power to the inverter 320 .

Even in the multicopter configured in this way, since the rotating electric machine described in the first to fourth embodiments is applied to the driving force source of the propulsion device, it is possible to realize a multicopter with high reliability and a long cruising distance. can be done.

FIG. 20 is an explanatory diagram of another multicopter according to this embodiment. In the multicopter 300 shown in FIG. 20, the rotating electric machine described in the first to fourth embodiments is also used as the generator 340. As shown in FIG. This generator 340 is driven by the engine 350 . Electric power generated by generator 340 is stored in battery 330 .

In the multicopter configured in this way, the rotating electric machine described in Embodiments 1 to 4 can be applied to the generator, and this generator can be used to supply electric power to the battery 330. A long multicopter can be realized.

As shown in Embodiments 5 and 6, by applying the rotating electric machine described in Embodiments 1 to 4 to the driving force source of the propulsion device of fixed-wing aircraft, rotary-wing aircraft, etc., reliability is high and An aircraft with a long cruising range can be realized.

Although this application describes various exemplary embodiments, the various features, aspects, and functions described in one or more embodiments are limited to the application of particular embodiments. can be applied to the embodiments alone or in various combinations.
Therefore, countless modifications not illustrated are envisioned within the scope of the technology disclosed in the present application. For example, modification, addition or omission of at least one component, extraction of at least one component, and combination with components of other embodiments shall be included.

Reference Signs List 1 stator 2 inner rotor 3 outer rotor 4 teeth member 4a fitting recess 4b, 5a, 6a fitting protrusion 5 outer annular core member 5b inner periphery recess 5c, 6c fitting recess , 6 inner annular core member, 6b outer recess, 7 coil, 8 inner rotor core, 9 outer rotor core, 10 outer rotor cover, 11 first stator holding member, 11a, 12a positioning projections, 11b bearing insertion hole 12 second stator holding member 13 bearing 14 rotating shaft 15 rotary electric machine cover 16 inner rotor magnet 17 outer rotor magnet 18 slot 19 insulating member 100 rotary electric machine 200 airplane 210 engine case 220 , 350 engine, 230, 310 propulsion fan, 300 multicopter, 320 inverter, 330 battery, 340 generator.

Claims (7)

an annular stator;
an inner rotor disposed on the inner peripheral side of the stator with a gap therebetween;
A rotating electric machine having an outer rotor disposed on the outer peripheral side of the stator with a gap therebetween and having magnets and capable of rotating integrally with the inner rotor with respect to the stator ,
The stator includes a plurality of tooth members that are annularly spaced apart, a plurality of coils wound around the plurality of tooth members, and fastened to the outer and inner peripheral sides of the plurality of tooth members, respectively. The outer ring-shaped core member and the inner ring-shaped core member are provided between the plurality of tooth members that are annularly spaced apart from each other. The space sandwiched between the annular core members is a slot, and the outer peripheral annular core member has an outer peripheral thin portion having a smaller radial thickness than other portions on the outer peripheral wall of the slot, The inner peripheral annular core member has an inner peripheral thin portion having a smaller radial thickness than other portions on the inner peripheral wall of the slot having the outer peripheral thin portion on the outer peripheral wall, and A rotary electric machine, wherein the thickness of the inner peripheral thin portion of the side annular core member is larger than the thickness of the outer peripheral thin portion of the outer annular core member. an annular stator;
an inner rotor disposed on the inner peripheral side of the stator with a gap therebetween and having a magnet;
A rotating electric machine having an outer rotor disposed on the outer peripheral side of the stator with a gap therebetween and having magnets and capable of rotating integrally with the inner rotor with respect to the stator,
The stator includes a plurality of tooth members that are annularly spaced apart, a plurality of coils that are respectively wound around the plurality of tooth members, and coils that are disposed on the outer and inner peripheral sides of the radial ends of the tooth members. An outer ring-shaped core member and an inner ring-shaped core member are fastened to each other, and the outer ring-shaped core member and the inner ring-shaped core member are disposed between the plurality of tooth members that are annularly spaced apart from each other. A space sandwiched between the peripheral annular core member and the peripheral annular core member forms a slot, and the outer peripheral annular core member has an outer peripheral thin portion having a smaller radial thickness than other portions on the outer peripheral wall of the slot. and the inner peripheral annular core member has an inner peripheral thin portion having a radial thickness smaller than that of other portions on the inner peripheral wall of the slot having the outer peripheral thin portion on the outer peripheral wall. Rotating electric machine characterized by: Axial ends of the outer annular core member and the inner annular core member are axially outward from axial ends of the plurality of coils respectively wound around the plurality of tooth members. 3. The electric rotating machine according to claim 1 , wherein the rotating electric machine is positioned. The tooth members are provided with fitting projections or fitting recesses, and the outer circumferential annular core member and the inner circumferential annular core member have the fitting projections or the fitting recesses provided on the teeth members. 4. The electric rotating machine according to any one of claims 1 to 3, further comprising a fitting recess or a fitting projection for fitting with the fitting recess. A pair of annular stator holding members for holding the stator are further provided, and both ends in the axial direction of the outer circumferential annular core member and the inner circumferential annular core member are fastened to the stator retaining members, respectively. The electric rotating machine according to any one of claims 1 to 4 , wherein 5. The pair of stator holding members each have a plurality of positioning projections for contacting axial ends of the plurality of teeth members to regulate the axial positions of the teeth members. The rotary electric machine described in . An aircraft comprising: the electric rotating machine according to any one of claims 1 to 6 ; and a propulsion fan driven by the electric rotating machine.

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