Magnetic body core, magnetic body core with coil, and rotary electric machine

Abstract

This magnetic body core comprises a core back portion and a tooth portion and is used in a rotary electric machine. The core back portion has: two end surfaces respectively facing in the axial direction along the rotational axis of the rotary electric machine and in the direction opposite the axial direction when the magnetic body core is assembled in the rotary electric machine; and two side surfaces aligned in the circumferential direction about the rotational axis when the magnetic body core is assembled in the rotary electric machine. Envisaging the four combinations obtained by selecting and combining one of the two end surfaces and one of the two side surfaces, the core back portion has a shape in which the end surface and side surface of at least one of the four combinations are connected via a cut surface.

Description

Magnetic core, magnetic core with coil, and rotating electrical machine

[0001] The present invention relates to a magnetic core used in a rotating electric machine, a magnetic core with a coil, and a rotating electric machine.

[0002] A known example of a conventional invention relating to a magnetic core is the stator core described in Patent Document 1. The stator core described in Patent Document 1 includes a yoke portion and teeth. Coils are wound around the teeth. The yoke portion has two end faces, one facing in an axial direction along the rotation axis of a rotating electric machine when the stator core is incorporated into the rotating electric machine, and the other facing in a direction opposite to the axial direction.

[0003] Japanese Patent Application Laid-Open No. 2006-158176

[0004] In the stator core described in Patent Document 1, there is a demand for ensuring an area where both end portions of the coil can be pulled out.

[0005] SUMMARY OF THE INVENTION It is therefore an object of the present invention to provide a magnetic core, a magnetic core with a coil, and a rotating electrical machine that can ensure an area from which both end portions of a coil can be drawn out.

[0006] A magnetic core according to one embodiment of the present invention is a magnetic core for use in a rotating electric machine, comprising a core back portion and teeth portions, wherein the core back portion has: two end faces facing an axial direction along the rotation axis of the rotating electric machine when the magnetic core is incorporated into the rotating electric machine, and a direction opposite to the axial direction, respectively; and two side faces aligned in a circumferential direction centered on the rotation axis when the magnetic core is incorporated into the rotating electric machine; and the shape of the core back portion is such that, when four combinations are considered that can be obtained by selecting and combining one from each of the two end faces and the two side faces, in at least one of the four combinations, the end faces and the side faces are connected via a cutout surface.

[0007] A magnetic core according to one embodiment of the present invention is a magnetic core for use in a rotary electric machine, comprising a core back portion and a teeth portion, wherein the teeth portion includes: a teeth main body portion that extends from the core back portion toward a rotor of the rotary electric machine when the magnetic core is incorporated into the rotary electric machine; and a teeth tip portion formed at the tip of the teeth main body portion, wherein the teeth tip portion has: two end faces that face an axial direction along the rotation axis of the rotary electric machine when the magnetic core is incorporated into the rotary electric machine, and a direction opposite to the axial direction, respectively; and two side faces that are aligned in a circumferential direction around the rotation axis when the magnetic core is incorporated into the rotary electric machine, and wherein the shape of the teeth tip portion is such that, when four combinations are obtained by selecting and combining one from each of the two end faces and the two side faces, in at least one of the four combinations, the end face and the side face are connected via a notched surface.

[0008] According to the present invention, it is possible to provide a magnetic core, a magnetic core with a coil, and a rotating electric machine that can ensure an area from which both end portions of a coil can be drawn out.

[0009] FIG. 1 is a perspective view of a magnetic core 1 according to a first embodiment of the present invention. FIG. 2 is a cross-sectional view of the core back portion 2 as viewed from the first direction DIR1. FIG. 3 is a perspective view of a coil-equipped magnetic core 14. FIG. 4 is a cross-sectional view of the core back portion 2 and the coil 13 as viewed from the first direction DIR1. FIG. 5 is a perspective view of the exterior of a brushless motor 100 in which the magnetic core 1 is used. FIG. 6 is an exploded perspective view of the brushless motor 100 in which the magnetic core 1 is used. FIG. 7 is a perspective view of a magnetic core 1a according to a first modified example of the present invention. FIG. 8 is a cross-sectional view of the core back portion 2 and the coil 13 as viewed from the first direction DIR1. FIG. 9 is a perspective view of a magnetic core 1b according to a second modified example of the present invention. FIG. 10 is a cross-sectional view of the core back portion 2 and the coil 13 as viewed from the first direction DIR1. FIG. 11 is a perspective view of a magnetic core 1c according to a third modified example of the present invention. FIG. 12 is a cross-sectional view of the core back portion 2 as viewed from the first direction DIR1. FIG. 13 is a perspective view of a magnetic core 1d according to a fourth modified example of the present invention. FIG. 14 is a cross-sectional view of the core back portion 2 viewed from the first direction DIR1. FIG. 15 is a perspective view of a magnetic core 1e according to a fifth modified example of the present invention. FIG. 16 is a cross-sectional view of the core back portion 2 viewed from the first direction DIR1. FIG. 17 is a perspective view of a magnetic core 1f according to a second embodiment of the present invention. FIG. 18 is a cross-sectional view of the tooth tip portion 32 viewed from the first direction DIR1. FIG. 19 is a perspective view of a coil-equipped magnetic core 14f. FIG. 20 is a cross-sectional view of the tooth tip portion 32 and the coil 13 viewed from the first direction DIR1. FIG. 21 is a perspective view of a magnetic core 1g according to a sixth modified example of the present invention. FIG. 22 is a cross-sectional view of the tooth tip portion 32 and the coil 13 viewed from the first direction DIR1. FIG. 23 is a perspective view of a magnetic core 1h according to a seventh modified example of the present invention. Fig. 24 is a cross-sectional view of the tooth tip portions 32 and the coil 13 when viewed in the first direction DIR1. Fig. 25 is a perspective view of a magnetic core 1i according to an eighth modified example of the present invention. Fig. 26 is a cross-sectional view of the tooth tip portions 32 when viewed in the first direction DIR1. Fig. 27 is a perspective view of a magnetic core 1j according to a ninth modified example of the present invention. Fig. 28 is a cross-sectional view of the tooth tip portions 32 when viewed in the first direction DIR1. Fig. 29 is a perspective view of a magnetic core 1k according to a tenth modified example of the present invention.FIG. 30 is a cross-sectional view of the tooth tip portion 32 as viewed in the first direction DIR1.

[0010] [First Embodiment] (Configuration of Magnetic Core 1) FIG. 1 is a perspective view of a magnetic core 1 according to a first embodiment of the present invention. As shown in FIG. 1, the magnetic core 1 includes a core back portion 2 and teeth portions 3. The teeth portions 3 extend from the core back portion 2 in the first direction DIR1. The teeth portions 3 include teeth main body portions 31 extending from the core back portion 2 in the first direction DIR1 and teeth tip portions 32 formed at the tips of the teeth main body portions 31 in the first direction DIR1. Coils 13 are wound around the teeth portions 3. More specifically, the coils 13 are wound around the teeth main body portions 31, as described below. The magnetic core 1 according to this embodiment is used in a brushless motor 100 (an example of a "rotating electric machine" of the present invention; see FIGS. 3 and 4 ), which will be described later. When the magnetic core 1 is incorporated into the brushless motor 100, the first direction DIR1 faces in the opposite radial direction centered on the rotational axis of the brushless motor 100. When the magnetic core 1 is incorporated into the brushless motor 100, the second direction DIR2 faces in the axial direction along the rotational axis of the brushless motor 100. When the magnetic core 1 is incorporated into the brushless motor 100, the opposite direction of the second direction DIR2 also faces in the axial direction along the rotational axis of the brushless motor 100. When the magnetic core 1 is incorporated into the brushless motor 100, the third direction DIR3 faces in the circumferential direction centered on the rotational axis of the brushless motor 100. When the magnetic core 1 is incorporated into the brushless motor 100, the opposite direction of the third direction DIR3 also faces in the circumferential direction centered on the rotational axis of the brushless motor 100. The specific details will be explained below.

[0011] The magnetic core 1 is made of a soft magnetic material. When an external magnetic field is applied to the soft magnetic material, the soft magnetic material is magnetized. When the application of the magnetic field is stopped, the soft magnetic material loses its magnetization. An example of a material for such a soft magnetic material is iron.

[0012] The magnetic core 1 is a molded body made of soft magnetic powder. That is, each of the core back portion 2 and the teeth portion 3 is a molded body made of soft magnetic powder. The material of the soft magnetic powder includes, for example, iron and a binder. The binder is, for example, resin. The soft magnetic powder is, for example, a mixture of iron powder and epoxy resin, which is an example of a binder. Such a magnetic core 1 is produced, for example, by press molding. Furthermore, an insulating treatment is applied to the outer surface of the magnetic core 1, which comes into contact with other components when the stator 15 is incorporated into the brushless motor 100.

[0013] As shown in FIG. 1 , the core back portion 2 has a first end face E1, a second end face E2, a first side face S1, a second side face S2, a first inner main surface IS1, and a first outer main surface OS1. The first end face E1 is an end face of the core back portion 2 in the second direction DIR2. The second end face E2 is an end face of the core back portion 2 in the opposite direction to the second direction DIR2. In this embodiment, the first end face E1 and the second end face E2 are flat. The first end face E1 is located closer to the second direction DIR2 than the second end face E2. When the magnetic core 1 is incorporated into the brushless motor 100, the first end face E1 faces in the second direction DIR2. Furthermore, the second end face E2 faces in the opposite direction to the second direction DIR2 when the magnetic core 1 is incorporated into the brushless motor 100. That is, the core back portion 2 has a first end face E1 and a second end face E2, which are two end faces that face in the axial direction along the rotation axis of the brushless motor 100 when the magnetic core 1 is incorporated into the brushless motor 100, and in the direction opposite to the axial direction.

[0014] As shown in FIG. 1 , the first side surface S1 and the second side surface S2 are surfaces connecting the edges of the first end surface E1 and the second end surface E2 in the third direction DIR3. The first side surface S1 is an end surface of the core back portion 2 in the third direction DIR3. The second side surface S2 is an end surface of the core back portion 2 in the direction opposite to the third direction DIR3. Therefore, the first side surface S1 and the second side surface S2 are aligned in the third direction DIR3 when the magnetic core 1 is incorporated into the brushless motor 100. That is, the core back portion 2 has the first side surface S1 and the second side surface S2, which are two side surfaces aligned in the circumferential direction about the rotation axis of the brushless motor 100 when the magnetic core 1 is incorporated into the brushless motor 100. In this embodiment, each of the first side surface S1 and the second side surface S2 is a flat surface.

[0015] As shown in FIG. 1 , the first inner principal surface IS1 and the first outer principal surface OS1 are surfaces connecting the edges of the first end surface E1 and the second end surface E2 in the first direction DIR1. The first inner principal surface IS1 is an end surface of the core back portion 2 in the first direction DIR1. The first outer principal surface OS1 is an end surface of the core back portion 2 in the opposite direction to the first direction DIR1. Therefore, the first outer principal surface OS1 and the first inner principal surface IS1 are aligned in the first direction DIR1 when the magnetic core 1 is incorporated into the brushless motor 100. That is, the core back portion 2 has the first inner principal surface IS1 and the first outer principal surface OS1, which are two principal surfaces aligned in the radial direction of the rotation axis of the brushless motor 100 when the magnetic core 1 is incorporated into the brushless motor 100. In this embodiment, the first inner principal surface IS1 and the first outer principal surface OS1 are each flat.

[0016] 2 is a cross-sectional view of the core back portion 2 as viewed from the first direction DIR1. Considering four combinations obtained by selecting and combining two end faces, a first end face E1 and a second end face E2, and two side faces, a first side face S1 and a second side face S2, one by one, the shape of the core back portion 2 is such that the end faces and the side faces are connected via a notched surface in at least one of the four combinations. Specifically, the four possible combinations are the combination of the first end face E1 and the first side face S1, the combination of the first end face E1 and the second side face S2, the combination of the second end face E2 and the first side face S1, and the combination of the second end face E2 and the second side face S2. In this embodiment, as shown in FIGS. 1 and 2 , the first end face E1 and the first side face S1 are connected via a first notched surface NS1. In this embodiment, the first inner principal surface IS1 and the first outer principal surface OS1 are connected by the first cutout surface NS1.

[0017] As shown in FIG. 2 , the first cutout surface NS1 is formed by cutting out the intersection of a first imaginary extended end surface VE1, which is obtained by expanding the first end surface E1 in the third direction DIR3, and a first imaginary extended side surface VS1, which is obtained by expanding the first side surface S1 in the second direction DIR2, for the combination of the first end surface E1 and the first side surface S1 connected by the first cutout surface NS1. The first imaginary extended end surface VE1 may be any surface obtained by expanding the first end surface E1 in the circumferential direction about the rotation axis of the brushless motor 100 when the magnetic core 1 is incorporated into the brushless motor 100. The first imaginary extended side surface VS1 may be any surface obtained by expanding the first side surface S1 in the axial direction along the rotation axis of the brushless motor 100 when the magnetic core 1 is incorporated into the brushless motor 100. In this embodiment, the first cutout surface NS1 is a flat surface, as shown in FIGS. 1 and 2 . As shown in FIG. 2, the area surrounded by the first imaginary extended end surface VE1, the first imaginary extended side surface VS1, and the first cutout surface NS1 is defined as a first area A1.

[0018] 1 , the tooth main body portion 31 extends in a first direction DIR1 from a first inner principal surface IS1 of the core back portion 2. When the magnetic core 1 is incorporated into the brushless motor 100, the tooth main body portion 31 extends from the core back portion 2 toward the rotor of the brushless motor 100. In this embodiment, the tooth main body portion 31 has a rectangular parallelepiped shape.

[0019] As shown in FIG. 1 , the tooth tip portions 32 have a third end face E3, a fourth end face E4, a third side face S3, a fourth side face S4, a second inner main surface IS2, and a second outer main surface OS2. The third end face E3 is an end face of the tooth tip portions 32 in the second direction DIR2. The fourth end face E4 is an end face of the tooth tip portions 32 in the opposite direction to the second direction DIR2. In this embodiment, the third end face E3 and the fourth end face E4 are flat. The third end face E3 is located closer to the fourth end face E4 in the second direction DIR2. When the magnetic core 1 is incorporated into the brushless motor 100, the third end face E3 faces in the second direction DIR2. Furthermore, the fourth end face E4 faces in the opposite direction to the second direction DIR2 when the magnetic core 1 is incorporated into the brushless motor 100. That is, the tooth tip portion 32 has a third end face E3 and a fourth end face E4, which are two end faces that face in the axial direction along the rotation axis of the brushless motor 100 when the magnetic core 1 is incorporated into the brushless motor 100, and in the direction opposite to the axial direction.

[0020] As shown in FIG. 1 , the third side surface S3 and the fourth side surface S4 are surfaces connecting the edges of the third end surface E3 and the fourth end surface E4 in the third direction DIR3. The third side surface S3 is an end surface of the tooth tip portion 32 in the third direction DIR3. The fourth side surface S4 is an end surface of the tooth tip portion 32 in the opposite direction to the third direction DIR3. Therefore, the third side surface S3 and the fourth side surface S4 are aligned in the third direction DIR3 when the magnetic core 1 is incorporated into the brushless motor 100. That is, the tooth tip portion 32 has the third side surface S3 and the fourth side surface S4, which are two side surfaces aligned in the circumferential direction around the rotation axis of the brushless motor 100 when the magnetic core 1 is incorporated into the brushless motor 100. In this embodiment, the third side surface S3 and the fourth side surface S4 are each flat.

[0021] As shown in FIG. 1 , the second inner principal surface IS2 and the second outer principal surface OS2 are surfaces connecting the edges of the third end surface E3 and the fourth end surface E4 in the first direction DIR1. The second inner principal surface IS2 is an end surface of the tooth tip portion 32 in the first direction DIR1. The second outer principal surface OS2 is an end surface of the tooth tip portion 32 in the opposite direction to the first direction DIR1. Therefore, the second outer principal surface OS2 and the second inner principal surface IS2 are aligned in the first direction DIR1 when the magnetic core 1 is incorporated into the brushless motor 100. That is, the tooth tip portion 32 has the second inner principal surface IS2 and the second outer principal surface OS2, which are two principal surfaces aligned in the radial direction of the rotation axis of the brushless motor 100 when the magnetic core 1 is incorporated into the brushless motor 100. In this embodiment, the second inner principal surface IS2 and the second outer principal surface OS2 are each flat.

[0022] (Configuration of Coiled Magnetic Core 14) The configuration of the coiled magnetic core 14 according to the first embodiment of the present invention will be described below with reference to the drawings. Fig. 3 is a perspective view of the coiled magnetic core 14. Fig. 4 is a cross-sectional view of the core back portion 2 and the coil 13 as viewed from the first direction DIR1.

[0023] As shown in FIG. 3 , the coil-equipped magnetic core 14 includes the magnetic core 1 and a coil 13 .

[0024] As shown in Fig. 3, the coil 13 is wound around the tooth main body 31. The coil 13 is made of a conductive material such as copper. The coil 13 has a structure in which the surface of a copper wire is covered with an insulating coating. Because the surface of the copper wire is covered with an insulating coating, the coil 13 is electrically insulated from the magnetic core 1. When the coil 13 is incorporated into the brushless motor 100, a current flows through the coil 13, generating a magnetic field.

[0025] As shown in FIG. 3 , the coil 13 has a first end E131 and a second end E132. The first end E131 and the second end E132 are opposite ends of the coil 13. When the magnetic core 1 is incorporated into the brushless motor 100, an electric signal is supplied from a power source (not shown) to each of the first end E131 and the second end E132 of the coil 13. At this time, each of the first end E131 and the second end E132 of the coil 13 is fixed to, for example, a terminal block (not shown) located in the opposite direction of the core back portion 2 in the first direction DIR1. As shown in FIGS. 3 and 4 , the coil 13 passes through the first region A1.

[0026] (Configuration of Brushless Motor 100) The configuration of the brushless motor 100 according to the first embodiment of the present invention will be described below with reference to the drawings. Fig. 5 is an external perspective view of the brushless motor 100 that uses the magnetic core 1. Fig. 6 is an exploded perspective schematic view of the brushless motor 100 that uses the magnetic core 1. Note that in Fig. 6, reference symbols are assigned only to representative magnetic cores 1, coils 13, and coil-equipped magnetic cores 14 among the multiple magnetic cores 1, multiple coils 13, and multiple coil-equipped magnetic cores 14, respectively.

[0027] 5 and 6, brushless motor 100 includes rotor 20 and stator assembly 10. As shown in Fig. 6, stator assembly 10 is disposed around rotor 20 when viewed in second direction DIR2. In other words, brushless motor 100 is an inner rotor type.

[0028] As shown in FIG. 6 , the rotor 20 includes a shaft 21 and a rotor member 22. The shaft 21 has a shape that extends in the second direction DIR2. More specifically, the shaft 21 is cylindrical. The rotor member 22 is cylindrical. The central axes of the shaft 21 and the rotor member 22 are the Z-axis. In other words, the rotation axis of the brushless motor 100 is the Z-axis. Therefore, the second direction DIR2 is a direction along the Z-axis.

[0029] 6, the rotor member 22 includes a soft magnetic material 23 and a hard magnetic material 24. The rotor member 22 is attached to the outer circumferential surface of the shaft 21 in the radial direction centered on the Z axis. More specifically, the soft magnetic material 23 is attached to the outer circumferential surface of the shaft 21 in the radial direction centered on the Z axis. The hard magnetic material 24 is attached to the outer circumferential surface of the soft magnetic material 23 in the radial direction centered on the Z axis.

[0030] The soft magnetic body 23 is a soft magnetic body. The hard magnetic body 24 is a hard magnetic body. A hard magnetic body is magnetized when an external magnetic field is applied. Even if the application of the magnetic field is stopped, the hard magnetic body does not lose its magnetization. Such hard magnetic body materials are magnets.

[0031] 6 , the stator assembly 10 includes a bearing 11, a housing 12, and a plurality of coil-equipped magnetic cores 14. Each of the plurality of coil-equipped magnetic cores 14 includes a magnetic core 1 and a coil 13. That is, the brushless motor 100 includes the magnetic core 1.

[0032] The bearing 11 supports the shaft 21 so that it can rotate in the circumferential direction around the Z-axis. More specifically, as shown in FIG. 6 , the bearing 11 has a first bearing 11a and a second bearing 11b. Each of the first bearing 11a and the second bearing 11b is, for example, a ball bearing. Each of the first bearing 11a and the second bearing 11b is cylindrical. The central axes of the first bearing 11a and the second bearing 11b are aligned with the Z-axis. That is, the central axes of the first bearing 11a and the second bearing 11b coincide with the central axis of the shaft 21.

[0033] 6, the second bearing 11b is positioned further in the second direction DIR2 than the first bearing 11a. The first bearing 11a is positioned in the opposite direction of the second direction DIR2 than the rotor member 22. The second bearing 11b is positioned further in the second direction DIR2 than the rotor member 22. The second bearing 11b supports the end of the shaft 21 in the second direction DIR2.

[0034] As shown in FIG. 5, the housing 12 has a first housing 12a and a second housing 12b. As shown in FIGS. 5 and 6, the first housing 12a is cylindrical. The central axis of the first housing 12a is the Z-axis. The first housing 12a is located in the opposite direction of the second direction DIR2 from the second housing 12b. The first housing 12a also has an opening OP. As a result, the end of the shaft 21 opposite the second direction DIR2 protrudes from the opening OP in the opposite direction of the second direction DIR2. In other words, the brushless motor 100 is a single-shaft type.

[0035] The first housing 12a supports the first bearing 11a, the plurality of magnetic cores 1, and the plurality of coils 13. The second housing 12b supports the second bearing 11b. The first housing 12a and the second housing 12b are each made of a highly rigid material such as SUS.

[0036] The number of coiled magnetic cores 14 is nine. The nine coiled magnetic cores 14 are arranged in a circumferential direction centered on the Z axis. The nine coiled magnetic cores 14 are arranged around the hard magnetic material 24 with a gap therebetween.

[0037] The magnetic core 1 is magnetized by both the magnetic field generated by the hard magnetic material 24 and the magnetic field generated by the coil 13 (described later). Note that an air gap exists between the magnetic core 1 and the rotor member 22, as shown in FIG.

[0038] A current is supplied from a power source (not shown) to the coil 13. The rotation of the rotor 20 is controlled by controlling this current.

[0039] [Effect] The magnetic core 1 ensures an area from which both end portions of the coil can be pulled out. More specifically, the first end face E1 and the first side face S1 are connected via the first cutout surface NS1. Therefore, the core back portion 2 has a shape in which the first end face E1 and the first side face S1 are cut out by the first cutout surface NS1. This allows both end portions of the coil 13 wound around the tooth portion 3 to be pulled out so that they pass through the area cut out by the first cutout surface NS1. As a result, the magnetic core 1 ensures an area from which both end portions of the coil can be pulled out.

[0040] Furthermore, the magnetic core 1 allows both ends of the coil to be drawn without increasing the size of the rotating electric machine. More specifically, the first cutout surface NS1 is formed by cutting out the intersection of a first imaginary extended end surface VE1, which is obtained by expanding the first end surface E1 in the third direction DIR3, and a first imaginary extended side surface VS1, which is obtained by expanding the first side surface S1 in the second direction DIR2, for the combination of the first end surface E1 and the first side surface S1 connected by the first cutout surface NS1. This allows both ends of the coil 13 to be drawn through a first area A1, which is an area surrounded by the first imaginary extended end surface VE1, the first imaginary extended side surface VS1, and the first cutout surface NS1. Therefore, the magnetic core 1 does not require a separate area from the magnetic core 1 where both ends of the coil can be drawn. As a result, the magnetic core 1 allows both ends of the coil to be drawn without increasing the size of the rotating electric machine.

[0041] Furthermore, the magnetic core 1 makes it easier to form the notched surface. More specifically, for example, when manufacturing a magnetic core by stacking electromagnetic steel sheets, cutting is required to form the first notched surface NS1 after stacking the electromagnetic steel sheets. On the other hand, the magnetic core 1 is a molded body formed from soft magnetic powder. Therefore, when manufacturing the magnetic core 1, cutting is not required to form the first notched surface NS1. As a result, the magnetic core 1 makes it easier to form the notched surface.

[0042] Alternatively, when manufacturing the magnetic core by stacking electromagnetic steel sheets, the width of the stacked electromagnetic steel sheets can be adjusted in advance to form the notched surface. In this case, the notched surface has a step. In this case, the coil 13 may come into contact with the corner of the step on the notched surface, which may damage the insulating coating of the coil 13. On the other hand, the magnetic core 1 is a molded body formed from soft magnetic powder. Therefore, when manufacturing the magnetic core 1, a notched surface without a step can be formed, so there is no risk of the insulating coating of the coil 13 being damaged by the notched surface.

[0043] [First Modification] A magnetic core 1a and a coil-equipped magnetic core 14a according to a first modification of the present invention will be described below with reference to the drawings. Fig. 7 is a perspective view of the magnetic core 1a according to the first modification of the present invention. Fig. 8 is a cross-sectional view of the core back portion 2 and the coil 13 as viewed from the first direction DIR1. Note that for the magnetic core 1a and the coil-equipped magnetic core 14a according to the first modification, only the differences from the magnetic core 1 and the coil-equipped magnetic core 14 according to the first embodiment will be described, and the rest will be omitted.

[0044] As shown in Figures 7 and 8, the magnetic core 1a and the magnetic core 14a with a coil differ from the magnetic core 1 and the magnetic core 14 with a coil in that the shape of the core back portion 2 is such that in all four combinations obtained by selecting and combining one from the first end face E1 and the second end face E2, and one from the first side face S1 and the second side face S2, the end face and the side face are connected by a notched surface.

[0045] 7 and 8 , in this modification, the first end face E1 and the second side face S2 are connected by a second cutout surface NS2. The second end face E2 and the first side face S1 are connected by a third cutout surface NS3. The second end face E2 and the second side face S2 are connected by a fourth cutout surface NS4. In this modification, the first inner main surface IS1 and the first outer main surface OS1 are connected by the first cutout surface NS1, the second cutout surface NS2, the third cutout surface NS3, and the fourth cutout surface NS4, respectively.

[0046] As shown in Fig. 8, the second cutout surface NS2 is a surface formed by cutting out the intersection of a first imaginary extended end surface VE1 obtained by expanding the first end surface E1 in the direction opposite to the third direction DIR3 and a second imaginary extended side surface VS2 obtained by expanding the second side surface S2 in the second direction DIR2, with respect to the combination of the first end surface E1 and the second side surface S2 connected by the second cutout surface NS2. In this modification, the second cutout surface NS2 is a flat surface, as shown in Figs. 7 and 8. The area surrounded by the first imaginary extended end surface VE1, the second imaginary extended side surface VS2, and the second cutout surface NS2 is defined as a second area A2, as shown in Fig. 8.

[0047] As shown in Fig. 8, the third cutout surface NS3 is a surface formed by cutting out the intersection of a second imaginary extended end surface VE2 obtained by extending the second end surface E2 in the third direction DIR3 and a first imaginary extended side surface VS1 obtained by extending the first side surface S1 in the direction opposite to the second direction DIR2, with respect to the combination of the second end surface E2 and the first side surface S1 connected by the third cutout surface NS3. In this modification, the third cutout surface NS3 is a flat surface, as shown in Figs. 7 and 8. The area surrounded by the second imaginary extended end surface VE2, the first imaginary extended side surface VS1, and the third cutout surface NS3 is defined as a third region A3, as shown in Fig. 8.

[0048] As shown in Fig. 8 , the fourth cutout surface NS4 is a surface formed by cutting out the intersection of a second imaginary extended end surface VE2 obtained by extending the second end surface E2 in the direction opposite to the third direction DIR3 and a second imaginary extended side surface VS2 obtained by extending the second side surface S2 in the direction opposite to the second direction DIR2, with respect to the combination of the second end surface E2 and the second side surface S2 connected by the fourth cutout surface NS4. In this modification, the fourth cutout surface NS4 is a flat surface, as shown in Figs. 7 and 8 . The area surrounded by the second imaginary extended end surface VE2, the second imaginary extended side surface VS2, and the fourth cutout surface NS4 is defined as a fourth region A4, as shown in Fig. 8 .

[0049] In this modification, the coil 13 passes through both the first area A1 and the second area A2, as shown in FIG.

[0050] The magnetic core 1a described above also achieves the same effects as the magnetic core 1. Furthermore, the magnetic core 1a can suppress chipping of the core back portion. More specifically, in all four combinations obtained by selecting and combining one of the first end face E1 and the second end face E2 and one of the first side face S1 and the second side face S2, the end face and the side face are connected by a notched surface. Therefore, the magnetic core 1a can suppress chipping of the core back portion.

[0051] Furthermore, the magnetic core 1a provides greater flexibility in the coil wiring layout. More specifically, in a plurality of combinations of four possible combinations obtained by selecting and combining one of the first end face E1 and the second end face E2 and one of the first side face S1 and the second side face S2, the end face and the side face are connected by a notched surface. Therefore, both ends of the coil 13 can be routed through at least one of the first region A1, the second region A2, the third region A3, and the fourth region A4. As a result, the magnetic core 1a provides greater flexibility in the coil wiring layout.

[0052] [Second Modification] A magnetic core 1b and a coil-equipped magnetic core 14b according to a second modification of the present invention will be described below with reference to the drawings. Fig. 9 is a perspective view of the magnetic core 1b according to the second modification of the present invention. Fig. 10 is a cross-sectional view of the core back portion 2 and the coil 13 as viewed from the first direction DIR1. Note that for the magnetic core 1b and the coil-equipped magnetic core 14b according to the second modification, only the differences from the magnetic core 1a and the coil-equipped magnetic core 14a according to the first modification will be described, and the rest will be omitted.

[0053] As shown in Figures 9 and 10, magnetic core 1b and magnetic core 14b with coil differ from magnetic core 1a and magnetic core 14a with coil, respectively, in that the area of ​​first region A1 is larger than the area of ​​second region A2, the area of ​​third region A3, and the area of ​​fourth region A4.

[0054] 10, the coil 13 passes through the first region A1. However, the coil 13 does not pass through the second region A2, the third region A3, or the fourth region A4. In other words, the coil 13 passes through the first region A1, which is the region with the largest area among the first region A1, the second region A2, the third region A3, and the fourth region A4.

[0055] The magnetic core 1b described above also achieves the same effects as the magnetic core 1a. Furthermore, the magnetic core 1b can suppress chipping of the core back portion while ensuring an area from which both end portions of the coil can be pulled out. More specifically, the area of ​​the first region A1 is larger than the areas of the second region A2, the third region A3, and the fourth region A4. This allows the coil 13 to pass through the first region A1, which has the largest area. Furthermore, in several of the four combinations obtained by selecting and combining one each of the first end face E1 and the second end face E2 and the first side face S1 and the second side face S2, the end faces and the side faces are connected by notched surfaces. Therefore, chipping of the core back portion 2 can be suppressed. As a result, the magnetic core 1b can suppress chipping of the core back portion while ensuring an area from which both end portions of the coil can be pulled out.

[0056] [Third Modification] A magnetic core 1c according to a third modification of the present invention will be described below with reference to the drawings. Fig. 11 is a perspective view of the magnetic core 1c according to the third modification of the present invention. Fig. 12 is a cross-sectional view of the core back portion 2 as viewed from the first direction DIR1. Note that, for the magnetic core 1c according to the third modification, only the differences from the magnetic core 1 according to the first embodiment will be described, and the rest will be omitted.

[0057] 11 and 12, the magnetic core 1c differs from the magnetic core 1 in that the first cutout surface NS1 is L-shaped when viewed from the first direction DIR1. The first cutout surface NS1 is not limited to being a single plane, and may include a plane as shown in FIGS.

[0058] The magnetic core 1c as described above also has the same effect as the magnetic core 1.

[0059] [Fourth Modification] A magnetic core 1d according to a fourth modification of the present invention will be described below with reference to the drawings. Fig. 13 is a perspective view of the magnetic core 1d according to the fourth modification of the present invention. Fig. 14 is a cross-sectional view of the core back portion 2 as viewed from the first direction DIR1. Note that, with regard to the magnetic core 1d according to the fourth modification, only the differences from the magnetic core 1 according to the first embodiment will be described, and the rest will be omitted.

[0060] 13 and 14 , the magnetic core 1d differs from the magnetic core 1 in that the first cutout surface NS1 is a convex surface. That is, the first cutout surface NS1 is not limited to a flat surface and may be a curved surface. In this modification, the first cutout surface NS1 is a convex surface that curves so as to protrude from the center of the core back portion 2 toward the intersection of the first imaginary extended end surface VE1 and the first imaginary extended side surface VS1 when viewed from the first direction DIR1.

[0061] The magnetic core 1d as described above also has the same effects as the magnetic core 1. Furthermore, the magnetic core 1d can further suppress chipping of the core back portion.

[0062] [Fifth Modification] A magnetic core 1e according to a fifth modification of the present invention will be described below with reference to the drawings. Fig. 15 is a perspective view of the magnetic core 1e according to the fifth modification of the present invention. Fig. 16 is a cross-sectional view of the core back portion 2 as viewed from the first direction DIR1. Note that, for the magnetic core 1e according to the fifth modification, only the differences from the magnetic core 1 according to the first embodiment will be described, and the rest will be omitted.

[0063] 15 and 16, the magnetic core 1e differs from the magnetic core 1 in the shape of the first cutout surface NS1. The first cutout surface NS1 is not limited to a single curved surface, but may include a curved surface. Also, the first cutout surface NS1 is not limited to a single convex surface, but may include a convex surface.

[0064] The magnetic core 1e as described above also provides the same effects as the magnetic core 1.

[0065] Second Embodiment A magnetic core 1f and a coil-equipped magnetic core 14f according to a second embodiment of the present invention will be described below with reference to the drawings. FIG. 17 is a perspective view of the magnetic core 1f according to the second embodiment of the present invention. FIG. 18 is a cross-sectional view of the tooth tip portion 32 as viewed in the first direction DIR1. FIG. 19 is a perspective view of the coil-equipped magnetic core 14f. FIG. 20 is a cross-sectional view of the tooth tip portion 32 and the coil 13 as viewed in the first direction DIR1. Note that for the magnetic core 1f and the coil-equipped magnetic core 14f according to the second embodiment, only the differences from the magnetic core 1 and the coil-equipped magnetic core 14 according to the first embodiment will be described, and the rest will be omitted.

[0066] 17 to 20 , the magnetic core 1f differs from the magnetic core 1 in that the first cutout surface NS1 is formed on the tooth tip portion 32. In this embodiment, the first cutout surface NS1 is not formed on the core back portion 2.

[0067] When considering four combinations obtained by selecting and combining one each of two end faces, the third end face E3 and the fourth end face E4, and two side faces, the third side face S3 and the fourth side face S4, the shape of the tooth tip portion 32 is such that, in at least one of the four combinations, the end face and the side face are connected via a notched surface. Specifically, the four possible combinations are the combination of the third end face E3 and the third side face S3, the combination of the third end face E3 and the fourth side face S4, the combination of the fourth end face E4 and the third side face S3, and the combination of the fourth end face E4 and the fourth side face S4. In this embodiment, as shown in FIGS. 17 and 18 , the third end face E3 and the third side face S3 are connected via a first notched surface NS1. In addition, in this embodiment, the second inner main surface IS2 and the second outer main surface OS2 are connected by the first notched surface NS1.

[0068] In this modification, as shown in FIG. 18 , the first cutout surface NS1 is formed by cutting out the intersection of a third imaginary extended end surface VE3, which is obtained by expanding the third end surface E3 in the third direction DIR3, and a third imaginary extended side surface VS3, which is obtained by expanding the third side surface S3 in the second direction DIR2, for the combination of the third end surface E3 and the third side surface S3 connected by the first cutout surface NS1. Note that the third imaginary extended end surface VE3 may be a surface obtained by expanding the third end surface E3 in the circumferential direction about the rotation axis of the brushless motor 100 when the magnetic core 1f is assembled into the brushless motor 100. Furthermore, the third imaginary extended side surface VS3 may be a surface obtained by expanding the third side surface S3 in the axial direction along the rotation axis of the brushless motor 100 when the magnetic core 1f is assembled into the brushless motor 100. In this embodiment, the first cutout surface NS1 is a flat surface, as shown in Figures 17 and 18. The area surrounded by the third imaginary extended end surface VE3, the third imaginary extended side surface VS3, and the first cutout surface NS1 is defined as a fifth area A5, as shown in Figure 18.

[0069] Each of the first end E131 and the second end E132 of the coil 13 is fixed to, for example, a terminal block (not shown) located in the first direction DIR1 further than the tooth tip portions 32. The coil 13 passes through a fifth region A5 as shown in FIGS.

[0070] The magnetic core 1f described above also achieves the same effects as the magnetic core 1. More specifically, the third end face E3 and the third side face S3 are connected via the first cutout surface NS1. Therefore, the tooth tip portion 32 has a shape in which the third end face E3 and the third side face S3 are cut out by the first cutout surface NS1. This allows both end portions of the coil 13 wound around the tooth portion 3 to be drawn through the area cut out by the first cutout surface NS1. As a result, the magnetic core 1f can ensure an area from which both end portions of the coil can be drawn out.

[0071] Furthermore, the magnetic core 1f allows both ends of the coil to be drawn without increasing the size of the rotating electric machine. More specifically, the first cutout surface NS1 is formed by cutting out the intersection of a third imaginary extended end surface VE3, which is obtained by expanding the third end surface E3 in the third direction DIR3, and a third imaginary extended side surface VS3, which is obtained by expanding the third side surface S3 in the second direction DIR2, for the combination of the third end surface E3 and the third side surface S3 connected by the first cutout surface NS1. This allows both ends of the coil 13 to be drawn through a fifth region A5, which is an area surrounded by the third imaginary extended end surface VE3, the third imaginary extended side surface VS3, and the first cutout surface NS1. Therefore, the magnetic core 1f does not require a separate region from the magnetic core 1f for drawing both ends of the coil. As a result, the magnetic core 1f allows both ends of the coil to be drawn without increasing the size of the rotating electric machine.

[0072] [Sixth Modification] A magnetic core 1g and a coil-equipped magnetic core 14g according to a sixth modification of the present invention will be described below with reference to the drawings. Fig. 21 is a perspective view of the magnetic core 1g according to the sixth modification of the present invention. Fig. 22 is a cross-sectional view of the tooth tip portion 32 and the coil 13 as viewed in the first direction DIR1. Note that for the magnetic core 1g and the coil-equipped magnetic core 14g according to the sixth modification, only the differences from the magnetic core 1f and the coil-equipped magnetic core 14f according to the second embodiment will be described, and the rest will be omitted.

[0073] As shown in Figures 21 and 22, magnetic core 1g and magnetic core 14g with coil differ from magnetic core 1f and magnetic core 14f with coil in that the shape of the tooth tip portion 32 is such that in all four combinations obtained by selecting and combining one from the third end face E3 and the fourth end face E4, and one from the third side face S3 and the fourth side face S4, the end face and the side face are connected by a notched surface.

[0074] 21 and 22 , in this modification, the third end face E3 and the fourth side face S4 are connected by the second cutout surface NS2. The fourth end face E4 and the third side face S3 are connected by the third cutout surface NS3. The fourth end face E4 and the fourth side face S4 are connected by the fourth cutout surface NS4. In this modification, the second inner main surface IS2 and the second outer main surface OS2 are connected by the first cutout surface NS1, the second cutout surface NS2, the third cutout surface NS3, and the fourth cutout surface NS4, respectively.

[0075] In this modification, the second cutout surface NS2 is a surface formed by cutting out the intersection of a third imaginary extended end surface VE3 obtained by extending the third end surface E3 in the direction opposite to the third direction DIR3 and a fourth imaginary extended side surface VS4 obtained by extending the fourth side surface S4 in the second direction DIR2, with respect to the combination of the third end surface E3 and the fourth side surface S4 connected by the second cutout surface NS2, as shown in Fig. 22. In this modification, the second cutout surface NS2 is a flat surface, as shown in Figs. 21 and 22. The area surrounded by the third imaginary extended end surface VE3, the fourth imaginary extended side surface VS4, and the second cutout surface NS2 is defined as a sixth area A6, as shown in Fig. 22.

[0076] In this modification, the third cutout surface NS3 is a surface formed by cutting out the intersection of a fourth imaginary extended end surface VE4, which is formed by extending the fourth end surface E4 in the third direction DIR3, and a third imaginary extended side surface VS3, which is formed by extending the third side surface S3 in the direction opposite to the second direction DIR2, for the combination of the fourth end surface E4 and the third side surface S3 connected by the third cutout surface NS3, as shown in Fig. 22. In this modification, the third cutout surface NS3 is a flat surface, as shown in Figs. 21 and 22. The area surrounded by the fourth imaginary extended end surface VE4, the third imaginary extended side surface VS3, and the third cutout surface NS3 is defined as a seventh area A7, as shown in Fig. 22.

[0077] In this modification, the fourth cutout surface NS4 is a surface formed by cutting out the intersection of a fourth imaginary extended end surface VE4 obtained by extending the fourth end surface E4 in the direction opposite the third direction DIR3 and a fourth imaginary extended side surface VS4 obtained by extending the fourth side surface S4 in the direction opposite the second direction DIR2, with respect to the combination of the fourth end surface E4 and the fourth side surface S4 connected by the fourth cutout surface NS4, as shown in Fig. 22 . In this modification, the fourth cutout surface NS4 is a flat surface, as shown in Figs. 21 and 22 . The area surrounded by the fourth imaginary extended end surface VE4, the fourth imaginary extended side surface VS4, and the fourth cutout surface NS4 is defined as an eighth area A8, as shown in Fig. 22 .

[0078] In this modification, the coil 13 passes through both the fifth area A5 and the sixth area A6, as shown in FIG.

[0079] The magnetic core 1g described above also achieves the same effect as the magnetic core 1f. Furthermore, the magnetic core 1g can suppress chipping of the tooth tips. More specifically, in all four combinations obtained by selecting and combining one of the third end face E3 and the fourth end face E4 and one of the third side face S3 and the fourth side face S4, the end face and the side face are connected by a notched surface. Therefore, the magnetic core 1g can suppress chipping of the tooth tips.

[0080] Furthermore, the magnetic core 1g provides greater flexibility in the coil wiring layout. More specifically, in a plurality of combinations of four combinations obtained by selecting and combining one of the third end face E3 and the fourth end face E4 and one of the third side face S3 and the fourth side face S4, the end face and the side face are connected by a notched surface. Therefore, both ends of the coil 13 can be routed through at least one of the fifth region A5, the sixth region A6, the seventh region A7, and the eighth region A8. As a result, the magnetic core 1g provides greater flexibility in the coil wiring layout.

[0081] [Seventh Modification] A magnetic core 1h and a coil-equipped magnetic core 14h according to a seventh modification of the present invention will be described below with reference to the drawings. Fig. 23 is a perspective view of the magnetic core 1h according to the seventh modification of the present invention. Fig. 24 is a cross-sectional view of the tooth tip portions 32 and the coil 13 as viewed in the first direction DIR1. Note that for the magnetic core 1h and the coil-equipped magnetic core 14h according to the seventh modification, only the differences from the magnetic core 1f and the coil-equipped magnetic core 14f according to the second embodiment will be described, and the rest will be omitted.

[0082] As shown in Figures 23 and 24, magnetic core 1h and magnetic core 14h with coil differ from magnetic core 1f and magnetic core 14f with coil, respectively, in that the area of ​​the fifth region A5 is larger than the area of ​​the sixth region A6, the area of ​​the seventh region A7, and the area of ​​the eighth region A8.

[0083] In this modification, the coil 13 passes through the fifth region A5 as shown in Fig. 24. However, the coil 13 does not pass through the sixth region A6, the seventh region A7, or the eighth region A8. In other words, the coil 13 passes through the fifth region A5, which is the region with the largest area among the fifth region A5, the sixth region A6, the seventh region A7, and the eighth region A8.

[0084] The magnetic core 1h described above also achieves the same effects as the magnetic core 1f. Furthermore, the magnetic core 1h can prevent chipping of the tooth tips while ensuring an area through which both end portions of the coil can be drawn. More specifically, the area of ​​the fifth region A5 is larger than the areas of the sixth region A6, the seventh region A7, and the eighth region A8. This allows the coil 13 to pass through the fifth region A5, which has the largest area. Furthermore, in multiple of the four combinations obtained by selecting and combining one of the third end face E3 and the fourth end face E4 and one of the third side face S3 and the fourth side face S4, the end faces and the side faces are connected by notched surfaces. Therefore, chipping of the tooth tips 32 can be prevented. As a result, the magnetic core 1h can prevent chipping of the tooth tips while ensuring an area through which both end portions of the coil can be drawn.

[0085] [Eighth Modification] A magnetic core 1i according to an eighth modification of the present invention will be described below with reference to the drawings. Fig. 25 is a perspective view of the magnetic core 1i according to the eighth modification of the present invention. Fig. 26 is a cross-sectional view of the tooth tip portion 32 as viewed in the first direction DIR1. Note that with regard to the magnetic core 1i according to the eighth modification, only the differences from the magnetic core 1f according to the second embodiment will be described, and the rest will be omitted.

[0086] 25 and 26, the magnetic core 1i differs from the magnetic core 1 in that the first cutout surface NS1 is L-shaped when viewed in the first direction DIR1. The first cutout surface NS1 is not limited to being a single plane, and may include a plane as shown in FIGS.

[0087] The magnetic core 1i as described above also has the same effect as the magnetic core 1f.

[0088] [Ninth Modification] A magnetic core 1j according to a ninth modification of the present invention will be described below with reference to the drawings. Fig. 27 is a perspective view of the magnetic core 1j according to the ninth modification of the present invention. Fig. 28 is a cross-sectional view of the tooth tip portion 32 as viewed in the first direction DIR1. Note that for the magnetic core 1j according to the ninth modification, only the differences from the magnetic core 1f according to the second embodiment will be described, and the rest will be omitted.

[0089] 27 and 28 , the magnetic core 1j differs from the magnetic core 1f in that the first cutout surface NS1 is a convex surface. That is, the first cutout surface NS1 is not limited to a flat surface and may be a curved surface. In this modification, the first cutout surface NS1 is a convex surface that curves to protrude from the center of the tooth tip portion 32 toward the intersection of the third imaginary extended end surface VE3 and the third imaginary extended side surface VS3 when viewed in the first direction DIR1.

[0090] The magnetic core 1j as described above also has the same effects as the magnetic core 1f. Furthermore, the magnetic core 1j can further prevent chipping of the tip portions of the teeth.

[0091] [Tenth Modification] A magnetic core 1k according to a tenth modification of the present invention will be described below with reference to the drawings. Fig. 29 is a perspective view of the magnetic core 1k according to the tenth modification of the present invention. Fig. 30 is a cross-sectional view of the tooth tip portion 32 as viewed in the first direction DIR1. Note that for the magnetic core 1k according to the tenth modification, only the differences from the magnetic core 1f according to the second embodiment will be described, and the rest will be omitted.

[0092] 29 and 30 , the magnetic core 1k differs from the magnetic core 1f in the shape of the first cutout surface NS1. The first cutout surface NS1 is not limited to a single curved surface, but may include a curved surface. Also, the first cutout surface NS1 is not limited to a single convex surface, but may include a convex surface.

[0093] The magnetic core 1k as described above also has the same effect as the magnetic core 1f.

[0094] Other Embodiments The magnetic core according to the present invention is not limited to the magnetic cores 1, 1a to 1k, and can be modified within the scope of the present invention. In addition, the structures of the magnetic cores 1, 1a to 1k may be combined arbitrarily.

[0095] The coiled magnetic core according to the present invention is not limited to the coiled magnetic cores 14, 14a to 14k each including a magnetic core 1, 1a to 1k and a coil 13, and can be modified within the scope of the invention. In addition, the structures of the coiled magnetic cores 14, 14a to 14k may be combined in any manner.

[0096] The rotating electric machine may have a structure in which a rotor is rotated by electricity or a structure in which electricity is generated by the rotation of the rotor. Rotating electric machines include brushless motors, permanent magnet synchronous motors, permanent magnet synchronous generators, etc. In this case, the rotating electric machine may have at least one of the magnetic cores 1, 1a to 1k, and may also have brushes.

[0097] It should be noted that the first direction DIR1 does not have to be oriented in the opposite radial direction about the rotation axis of the brushless motor 100 when the magnetic core 1 is incorporated into the brushless motor 100 .

[0098] The first end face E1, the second end face E2, the third end face E3, and the fourth end face E4 do not have to be flat. The first side face S1, the second side face S2, the third side face S3, and the fourth side face S4 do not have to be flat. The first inner main surface IS1, the first outer main surface OS1, the second inner main surface IS2, and the second outer main surface OS2 do not have to be flat.

[0099] The first inner main surface IS1 and the first outer main surface OS1 do not have to be connected by the first cutout surface NS1. The first inner main surface IS1 and the first outer main surface OS1 do not have to be connected by the second cutout surface NS2. The first inner main surface IS1 and the first outer main surface OS1 do not have to be connected by the third cutout surface NS3. The first inner main surface IS1 and the first outer main surface OS1 do not have to be connected by the fourth cutout surface NS4.

[0100] The brushless motor 100 may be an outer rotor type.

[0101] The brushless motor 100 is not limited to a single-shaft type, but may be, for example, a double-shaft type.

[0102] It should be noted that the first bearing 11a and the second bearing 11b are not limited to ball bearings.

[0103] The first housing 12a and the second housing 12b may be made of any material as long as it has high rigidity.

[0104] The number of coil-equipped magnetic cores 14 is not limited to nine.

[0105] In addition, in each of the magnetic core 1 and the coil-equipped magnetic core 14, instead of the first cutout surface NS1, at least one of the first cutout surface NS1, the second cutout surface NS2, the third cutout surface NS3 and the fourth cutout surface NS4 may be formed in the core back portion 2.

[0106] In the coiled magnetic core 14a, the coil 13 does not necessarily have to pass through both the first region A1 and the second region A2. In the coiled magnetic core 14a, the coil 13 only needs to pass through at least one of the first region A1, the second region A2, the third region A3, and the fourth region A4.

[0107] In each of the magnetic core 1b and the coil-equipped magnetic core 14b, the area of ​​the first region A1 does not have to be larger than the areas of the second region A2, the third region A3, and the fourth region A4. More specifically, the end face and the side face do not have to be connected by a notch in all four combinations (the combination of the first end face E1 and the first side face S1, the combination of the first end face E1 and the second side face S2, the combination of the second end face E2 and the first side face S1, and the combination of the second end face E2 and the second side face S2). It is sufficient that the end face and the side face are connected by a notch in more than one of the four combinations. Furthermore, the area of ​​the first region A1 does not necessarily have to be larger than the areas of the second region A2, the third region A3, and the fourth region A4. For example, the area of ​​the second region A2 may be larger than the area of ​​the first region A1, the area of ​​the third region A3, and the area of ​​the fourth region A4. In this case, the coil 13 passes through the second region A2, which is the region with the largest area.

[0108] In the magnetic core 1c, the first cutout surface NS1 does not have to be L-shaped when viewed from the first direction DIR1.

[0109] In addition, in the magnetic core 1d, the first cutout surface NS1 does not have to be a convex surface that curves so as to protrude from the center of the core back portion 2 toward the intersection of the first imaginary extended end face VE1 and the first imaginary extended side face VS1 when viewed from the first direction DIR1.

[0110] The second inner principal surface IS2 and the second outer principal surface OS2 do not have to be connected by the first cutout surface NS1. The second inner principal surface IS2 and the second outer principal surface OS2 do not have to be connected by the second cutout surface NS2. The second inner principal surface IS2 and the second outer principal surface OS2 do not have to be connected by the third cutout surface NS3. The second inner principal surface IS2 and the second outer principal surface OS2 do not have to be connected by the fourth cutout surface NS4.

[0111] In addition, in each of the magnetic core 1f and the coil-equipped magnetic core 14f, instead of the first notch surface NS1, at least one of the first notch surface NS1, the second notch surface NS2, the third notch surface NS3 and the fourth notch surface NS4 may be formed on the tooth tip portion 32.

[0112] In the coiled magnetic core 14g, the coil 13 does not necessarily have to pass through both the fifth region A5 and the sixth region A6. In the coiled magnetic core 14g, the coil 13 may pass through at least one of the fifth region A5, the sixth region A6, the seventh region A7, and the eighth region A8.

[0113] In each of the magnetic core 1 h and the coil-equipped magnetic core 14 h, the area of ​​the fifth region A5 does not have to be larger than the area of ​​the sixth region A6, the area of ​​the seventh region A7, and the area of ​​the eighth region A8. More specifically, in all of the four combinations (the combination of the third end face E3 and the third side face S3, the combination of the third end face E3 and the fourth side face S4, the combination of the fourth end face E4 and the third side face S3, and the combination of the fourth end face E4 and the fourth side face S4), the end face and the side face do not need to be connected by a notched surface, but it is sufficient that the end face and the side face are connected by a notched surface in more than one of the four combinations. Furthermore, the area of ​​the fifth region A5 does not necessarily have to be larger than the areas of the sixth region A6, the seventh region A7, and the eighth region A8, and for example, the area of ​​the sixth region A6 may be larger than the areas of the fifth region A5, the seventh region A7, and the eighth region A8. In this case, the coil 13 passes through the sixth region A6, which is the region with the largest area.

[0114] In the magnetic core 1i, the first cutout surface NS1 does not have to be L-shaped when viewed in the first direction DIR1.

[0115] In addition, in the magnetic core 1j, the first cutout surface NS1 does not have to be a convex surface that curves so as to protrude from the center of the tooth tip portion 32 toward the intersection of the third imaginary extended end face VE3 and the third imaginary extended side face VS3 when viewed in the first direction DIR1.

[0116] The first notched surface NS1, the second notched surface NS2, the third notched surface NS3, and the fourth notched surface NS4 may each be formed in both the core back portion 2 and the tooth tip end portion 32.

[0117] The magnetic cores 1, 1a to 1k may be made by laminating electromagnetic steel sheets.

[0118] The present invention has the following configuration.

[0119] (1) A magnetic core for use in a rotating electric machine, the magnetic core comprising a core back portion and teeth portions, wherein the core back portion has: two end faces facing an axial direction along the rotation axis of a rotating electric machine when the magnetic core is incorporated into the rotating electric machine, and a direction opposite to the axial direction, respectively; and two side faces aligned in a circumferential direction centered on the rotation axis when the magnetic core is incorporated into the rotating electric machine; and when considering four combinations obtained by selecting and combining one from each of the two end faces and the two side faces, the shape of the core back portion is such that, in at least one of the four combinations, the end faces and the side faces are connected via a cutout surface.

[0120] (2) The magnetic core according to (1), wherein the cutout surface is a surface formed to cut out a portion where an imaginary extended end surface formed by expanding the end face in the circumferential direction and an imaginary extended side surface formed by expanding the side face in the axial direction intersect, with respect to a combination of the end face and the side face connected by the cutout surface.

[0121] (3) The magnetic core according to (2), wherein in all of the four combinations, the end face and the side face are connected by the notched surface.

[0122] (4) A magnetic core according to (2) or (3), wherein in a plurality of combinations among the four combinations, the end faces and the side faces are connected by the cutout surfaces, and the area of ​​the region surrounded by the imaginary extended end faces, the imaginary extended side faces, and the cutout surfaces in one of the plurality of combinations is larger than the corresponding areas in the other combinations.

[0123] (5) The magnetic core according to any one of (1) to (4), wherein the cutout surface includes a flat surface.

[0124] (6) The magnetic core according to any one of (1) to (5), wherein the cutout surface includes a convex surface.

[0125] (7) A magnetic core with a coil, comprising: the magnetic core according to (2) or (3); and a coil, wherein the coil is wound around the tooth portion, and the coil passes through an area surrounded by the imaginary extended end surface, the imaginary extended side surface, and the cutout surface.

[0126] (8) A magnetic core with a coil, comprising: the magnetic core according to (4); and a coil, wherein the coil is wound around the tooth portion, and the coil passes through the region having the largest area.

[0127] (9) A magnetic core for use in a rotating electric machine, the magnetic core comprising a core back portion and teeth portions, wherein the teeth portions include: teeth main body portions that extend from the core back portion toward a rotor of the rotating electric machine when the magnetic core is incorporated into the rotating electric machine; and teeth tip portions formed at the tips of the teeth main body portions, wherein the teeth tip portions have: two end faces that face an axial direction along the rotation axis of the rotating electric machine when the magnetic core is incorporated into the rotating electric machine, and a direction opposite to the axial direction, respectively; and two side faces that are aligned in a circumferential direction around the rotation axis when the magnetic core is incorporated into the rotating electric machine, wherein a shape of the teeth tip portions is such that, when four combinations are considered that can be obtained by selecting and combining one from the two end faces and one from the two side faces, in at least one of the four combinations, the end faces and the side faces are connected via a notched surface.

[0128] (10) The magnetic core according to (9), wherein the cutout surface is a surface formed to cut out a portion where an imaginary extended end surface formed by expanding the end face in the circumferential direction and an imaginary extended side surface formed by expanding the side face in the axial direction intersect, with respect to a combination of the end face and the side face connected by the cutout surface.

[0129] (11) The magnetic core according to (10), wherein in all of the four combinations, the end face and the side face are connected by the notched surface.

[0130] (12) The magnetic core according to (10) or (11), wherein in a plurality of combinations among the four combinations, the end faces and the side faces are connected by the cutout surfaces, and the area of ​​the region surrounded by the imaginary extended end faces, the imaginary extended side faces, and the cutout surfaces in one of the plurality of combinations is larger than the corresponding areas in the other combinations.

[0131] (13) The magnetic core according to any one of (9) to (12), wherein the cutout surface includes a flat surface.

[0132] (14) The magnetic core according to any one of (9) to (13), wherein the cutout surface includes a convex surface.

[0133] (15) A magnetic core with a coil, comprising: the magnetic core according to (10) or (11); and a coil, wherein the coil is wound around the tooth main body portion, and the coil passes through an area surrounded by the imaginary extended end surface, the imaginary extended side surface, and the cutout surface.

[0134] (16) A magnetic core with a coil, comprising: the magnetic core according to (12); and a coil, wherein the coil is wound around the tooth main body portion, and the coil passes through the region having the largest area.

[0135] (17) The magnetic core according to any one of (1) to (6) or (9) to (14), which is a molded body formed from soft magnetic powder.

[0136] (18) A rotating electric machine including the magnetic core according to any one of (1) to (6), (9) to (14), or (17).

[0137] DESCRIPTION OF SYMBOLS 1, 1a, 1b, 1c, 1d, 1e, 1f, 1g, 1h, 1i, 1j, 1k: magnetic core 2: core back portion 3: teeth portion 10: stator assembly 11: bearing 11a: first bearing 11b: second bearing 12: housing 12a: first housing 12b: second housing 13: coil 14, 14a, 14b, 14c, 14d, 14e, 14f, 14g, 14h, 14i, 14j, 14k: magnetic core with coil 15: stator 20: rotor 21: shaft 22: rotor member 23: soft magnetic material 24: hard magnetic material 31: teeth main body portion 32: teeth tip portion 100: brushless motor A1: first region A2: second region A3: third region A4: Fourth area A5: Fifth area A6: Sixth area A7: Seventh area A8: Eighth area DIR1: First direction DIR2: Second direction DIR3: Third direction E131: First end E132: Second end E1: First end face E2: Second end face E3: Third end face E4: Fourth end face IS1: First inner principal surface IS2: Second inner principal surface NS1: First notched surface NS2: Second notched surface NS3: Third notched surface NS4: Fourth notched surface OP: Opening OS1: First outer principal surface OS2: Second outer principal surface S1: First side S2: Second side S3: Third side S4: Fourth side VE1: First virtual extended end surface VE2: Second imaginary extended end face VE3: Third imaginary extended end face VE4: Fourth imaginary extended end face VS1: First imaginary extended side face VS2: Second imaginary extended side face VS3: Third imaginary extended side face VS4: Fourth imaginary extended side face

Claims

1. A magnetic core for use in a rotating electric machine, the magnetic core comprising a core back portion and a teeth portion, The core back portion is two end faces respectively facing an axial direction along a rotation shaft of the rotary electric machine when the magnetic core is assembled in the rotary electric machine and a direction opposite to the axial direction; two side surfaces arranged in a circumferential direction about the rotation axis when the magnetic core is assembled in the rotating electric machine; an outer main surface that connects end edges of the two end surfaces in a radial direction about the rotation axis when the magnetic core is assembled in the rotating electric machine; and an inner main surface connecting end edges of the two end surfaces in the radially opposite directions when the magnetic core is assembled in the rotating electrical machine; having When four combinations are considered that can be obtained by selecting and combining one each of the two end faces and the two side faces, the shape of the core back portion is such that, in at least one of the four combinations, the end face, the side face, the outer main surface, and the inner main surface are connected via a cutout surface. Magnetic core.

2. The cutout surface is a surface formed so as to cut out a portion where a virtual extended end surface obtained by expanding the end surface in the circumferential direction and a virtual extended side surface obtained by expanding the side surface in the axial direction intersect, with respect to a combination of the end surface and the side surface connected by the cutout surface. The magnetic core according to claim 1 .

3. In all of the four combinations, the end surface and the side surface are connected by the notched surface. The magnetic core according to claim 2 .

4. In a plurality of combinations among the four combinations, the end surface and the side surface are connected by the notched surface, an area of ​​a region surrounded by the imaginary extended end surface, the imaginary extended side surface, and the notch surface in one combination of the plurality of combinations is larger than the area of ​​the region surrounded by the imaginary extended end surface, the imaginary extended side surface, and the notch surface in another combination; The magnetic core according to claim 2 or 3.

5. The cutout surface includes a flat surface. The magnetic core according to claim 1 .

6. The cutout surface includes a convex surface. The magnetic core according to claim 1 .

7. The magnetic core according to claim 2 or 3, A coil and Equipped with The coil is wound around the teeth portion, The coil passes through a region surrounded by the imaginary extended end surface, the imaginary extended side surface, and the cutout surface. Magnetic core with coil.

8. The magnetic core according to claim 4, A coil and Equipped with The coil is wound around the teeth portion, The coil passes through the region having the largest area. Magnetic core with coil.

9. A magnetic core for use in a rotating electric machine, the magnetic core comprising a core back portion and a teeth portion, The teeth portion includes: a teeth main body portion that extends from the core back portion toward a rotor of the rotating electric machine when the magnetic core is assembled into the rotating electric machine, and a teeth tip portion formed at a tip of the teeth main body portion, The tooth tip portion is two end faces respectively facing an axial direction along a rotation shaft of the rotary electric machine when the magnetic core is assembled in the rotary electric machine and a direction opposite to the axial direction; two side surfaces arranged in a circumferential direction about the rotation axis when the magnetic core is assembled in the rotating electric machine; having When considering four combinations obtained by selecting and combining one each of the two end faces and the two side faces, the shape of the tip end portion of the teeth is such that the end face and the side face are connected via a notch surface in at least one of the four combinations. Magnetic core.

10. The cutout surface is a surface formed so as to cut out a portion where a virtual extended end surface obtained by expanding the end surface in the circumferential direction and a virtual extended side surface obtained by expanding the side surface in the axial direction intersect, with respect to a combination of the end surface and the side surface connected by the cutout surface. The magnetic core according to claim 9.

11. In all of the four combinations, the end surface and the side surface are connected by the notched surface. The magnetic core according to claim 10.

12. In a plurality of combinations among the four combinations, the end surface and the side surface are connected by the notched surface, an area of ​​a region surrounded by the imaginary extended end surface, the imaginary extended side surface, and the notch surface in one combination of the plurality of combinations is larger than the area of ​​the region surrounded by the imaginary extended end surface, the imaginary extended side surface, and the notch surface in another combination; The magnetic core according to claim 10 or 11.

13. The cutout surface includes a flat surface. The magnetic core according to any one of claims 9 to 11.

14. The cutout surface includes a convex surface. The magnetic core according to any one of claims 9 to 11.

15. A magnetic core according to claim 10 or 11; A coil and Equipped with The coil is wound around the tooth main body, The coil passes through a region surrounded by the imaginary extended end surface, the imaginary extended side surface, and the cutout surface. Magnetic core with coil.

16. The magnetic core according to claim 12; A coil and Equipped with The coil is wound around the tooth main body, The coil passes through the region having the largest area. Magnetic core with coil.

17. A magnetic core for use in a rotating electrical machine, comprising a core back portion and a teeth portion, The core back portion is two end faces respectively facing an axial direction along a rotation shaft of the rotary electric machine when the magnetic core is assembled in the rotary electric machine and a direction opposite to the axial direction; two side surfaces arranged in a circumferential direction about the rotation axis when the magnetic core is assembled in the rotating electric machine; having a shape of the core back portion is such that, when four combinations are obtained by selecting and combining one each of the two end faces and the two side faces, the end faces and the side faces are connected by a notched surface in all of the four combinations; The cutout surface is a surface formed so as to cut out a portion where a virtual extended end surface obtained by expanding the end surface in the circumferential direction and a virtual extended side surface obtained by expanding the side surface in the axial direction intersect, with respect to a combination of the end surface and the side surface connected by the cutout surface. Magnetic core.

18. A magnetic core according to claim 17, A coil and Equipped with The coil is wound around the teeth portion, The coil passes through a region surrounded by the imaginary extended end surface, the imaginary extended side surface, and the cutout surface. Magnetic core with coil.

19. A magnetic core for use in a rotating electric machine, comprising a core back portion and a teeth portion, The core back portion is two end faces respectively facing an axial direction along a rotation shaft of the rotary electric machine when the magnetic core is assembled in the rotary electric machine and a direction opposite to the axial direction; two side surfaces arranged in a circumferential direction about the rotation axis when the magnetic core is assembled in the rotating electric machine; having a shape of the core back portion is such that, when four combinations are obtained by selecting and combining one each of the two end faces and the two side faces, in at least one of the four combinations, the end face and the side face are connected via a notched surface; The cutout surface is a surface formed to cut out a portion where a virtual extended end surface obtained by expanding the end surface in the circumferential direction and a virtual extended side surface obtained by expanding the side surface in the axial direction intersect, with respect to a combination of the end surface and the side surface connected by the cutout surface; In a plurality of combinations among the four combinations, the end surface and the side surface are connected by the notched surface, an area of ​​a region surrounded by the imaginary extended end surface, the imaginary extended side surface, and the notch surface in one combination of the plurality of combinations is larger than the area of ​​the region surrounded by the imaginary extended end surface, the imaginary extended side surface, and the notch surface in another combination; Magnetic core.

20. A magnetic core according to claim 19, A coil and Equipped with The coil is wound around the teeth portion, The coil passes through the region having the largest area. Magnetic core with coil.

21. A compact formed from soft magnetic powder. The magnetic core according to any one of claims 1 to 3, claims 9 to 11, claims 17 and 19.

22. A magnetic core according to any one of claims 1 to 3, claims 9 to 11, claims 17 and 19, Rotating electrical machines.