Magnetic cores, magnetic cores with coils, and rotating electrical machinery

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

Technical Field

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

Background Art

[0002] As an invention related to a conventional magnetic core, for example, a stator core described in Patent Document 1 is known. 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 respectively facing in the axial direction along the rotation axis of the rotating electrical machine when the stator core is incorporated into the rotating electrical machine and in the direction opposite to the axial direction.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] In the stator core described in Patent Document 1, there is a desire to secure a region where both end portions of the coil can be drawn out.

[0005] Therefore, an object of the present invention is to provide a magnetic core, a magnetic core with a coil, and a rotating electrical machine that can secure a region where both end portions of the coil can be drawn out.

Means for Solving the Problems

[0006] The magnetic core according to one embodiment of the present invention is a magnetic core including a core back portion and tooth portions, and used in a rotating electrical machine, wherein the core back portion When the magnetic core is incorporated into the rotating electric machine, it has two end faces that face in the axial direction along the rotation axis of the rotating electric machine, and in the direction opposite to the axial direction, When the magnetic core is incorporated into the rotating electric machine, there are two sides that are aligned in the circumferential direction with respect to the rotation axis, It has, The shape of the core back portion is such that, when considering four combinations obtained by selecting and combining one from each of the two end faces and the two side faces, at least one of these four combinations has a shape in which the end face and the side face are connected via a notched surface.

[0007] A magnetic core according to one embodiment of the present invention is A magnetic core for use in a rotating electrical machine, comprising a core back portion and a teeth portion, The aforementioned teeth portion is, It includes a tooth body portion that extends from the core back portion toward the rotor of the rotating electric machine when the magnetic core is incorporated into the rotating electric machine, and a tooth tip portion formed at the tip of the tooth body portion. The tip of the tooth is, When the magnetic core is incorporated into the rotating electric machine, it has two end faces that face in the axial direction along the rotation axis of the rotating electric machine, and in the direction opposite to the axial direction, When the magnetic core is incorporated into the rotating electric machine, there are two sides that are aligned in the circumferential direction with respect to the rotation axis, It has, The shape of the tooth tip is such that, when considering four combinations obtained by selecting and combining one from each of the two end faces and the two side faces, at least one of the four combinations has a shape in which the end face and the side face are connected via a notched surface. [Effects of the Invention]

[0008] According to the present invention, it is possible to provide a magnetic core that can secure a region from which both ends of a coil can be drawn out, a magnetic core with a coil, and a rotating electric machine. [Brief explanation of the drawing]

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

BEST MODE FOR CARRYING OUT THE INVENTION

[0010] [First Embodiment] (Configuration of magnetic core 1) Figure 1 is a perspective view of a magnetic core 1 according to a first embodiment of the present invention. As shown in Figure 1, the magnetic core 1 comprises a core back portion 2 and a teeth portion 3. The teeth portion 3 has a shape that extends from the core back portion 2 in a first direction DIR1. The teeth portion 3 includes a teeth body portion 31 that extends from the core back portion 2 in the first direction DIR1 and a teeth tip portion 32 formed at the tip of the teeth body portion 31 with respect to the first direction DIR1. A coil 13 is wound around the teeth portion 3. More specifically, the coil 13 is wound around the teeth body portion 31, as will be described later. This magnetic core 1 of this embodiment is used in a brushless motor 100 (an example of the "rotating electric machine" of the present invention; see Figures 3 and 4) described later. When the magnetic core 1 is incorporated into the brushless motor 100, the first direction DIR1 will face in the opposite radial direction with respect to the rotation axis of the brushless motor 100. Furthermore, when the magnetic core 1 is incorporated into the brushless motor 100, the second direction DIR2 will be oriented 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, the opposite direction of the second direction DIR2 will also be oriented in the axial direction along the rotation axis of the brushless motor 100. Additionally, when the magnetic core 1 is incorporated into the brushless motor 100, the third direction DIR3 will be oriented in the circumferential direction centered on the rotation 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 will also be oriented in the circumferential direction centered on the rotation axis of the brushless motor 100. A detailed explanation follows below.

[0011] The magnetic core 1 is a soft magnetic material. A soft magnetic material becomes magnetized when an external magnetic field is applied. Subsequently, when the application of the magnetic field is stopped, the soft magnetic material loses its magnetization. An example of such a soft magnetic material is iron.

[0012] The magnetic core 1 is a molded body formed from soft magnetic powder. That is, the core back portion 2 and the teeth portion 3 are each molded bodies formed from soft magnetic powder. The material of the soft magnetic powder includes, for example, iron and a binder. The binder is, for example, a 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 manufactured, for example, by press molding. Also, in the brushless motor 100... Magnetic core 1 The outer surface of the magnetic core 1, which comes into contact with other components when assembled, is treated with an insulating coating.

[0013] As shown in Figure 1, the core back portion 2 has a first end face E1, a second end face E2, a first side surface S1, a second side surface S2, a first inner main surface IS1, and a first outer main surface OS1. The first end face E1 is the end face of the core back portion 2 with respect to the second direction DIR2. The second end face E2 is the end face of the core back portion 2 with respect to the opposite direction of the second direction DIR2. In this embodiment, both the first end face E1 and the second end face E2 are planar. The first end face E1 is located further in the second direction DIR2 than the second end face E2. When the magnetic core 1 is assembled into the brushless motor 100, the first end face E1 faces the second direction DIR2. Also, when the magnetic core 1 is assembled into the brushless motor 100, the second end face E2 faces the opposite direction of the second direction DIR2. In other words, 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 and in the opposite direction to the axial direction when the magnetic core 1 is incorporated into the brushless motor 100.

[0014] As shown in Figure 1, the first side surface S1 and the second side surface S2 are surfaces that connect the edges of the first end surface E1 and the second end surface E2 with respect to the third direction DIR3. The first side surface S1 is the end surface of the core back portion 2 with respect to the third direction DIR3. The second side surface S2 is the end surface of the core back portion 2 with respect to the opposite direction of the third direction DIR3. Therefore, the first side surface S1 and the second side surface S2 are aligned with the third direction DIR3 when the magnetic core 1 is incorporated into the brushless motor 100. In other words, the core back portion 2 has a first side surface S1 and a second side surface S2, which are two sides that are 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 first side surface S1 and the second side surface S2 are each planar.

[0015] As shown in Figure 1, the first inner main surface IS1 and the first outer main surface OS1 are surfaces that connect the edges of the first end surface E1 and the second end surface E2 with respect to the first direction DIR1. The first inner main surface IS1 is the end surface of the core back portion 2 with respect to the first direction DIR1. The first outer main surface OS1 is the end surface of the core back portion 2 with respect to the opposite direction of the first direction DIR1. Therefore, the first outer main surface OS1 and the first inner main surface IS1 are aligned in the first direction DIR1 when the magnetic core 1 is incorporated into the brushless motor 100. In other words, the core back portion 2 has the first inner main surface IS1 and the first outer main surface OS1, which are two main 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 main surface IS1 and the first outer main surface OS1 are both planar.

[0016] Figure 2 is a cross-sectional view of the core back portion 2 as seen from the first direction DIR1. The shape of the core back portion 2 is such that, when considering four combinations obtained by selecting and combining one from each of the two end faces, the first end face E1 and the second end face E2, and the two side faces, the first side face S1 and the second side face S2, at least one of these four combinations has a shape in which the end face and the side face are connected via a notched surface. 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 Figures 1 and 2, the shape is such that the first end face E1 and the first side face S1 are connected via a first notched surface NS1. Furthermore, in this embodiment, the first inner main surface IS1 and the first outer main surface OS1 are connected by the first notched surface NS1.

[0017] As shown in Figure 2, the first notch surface NS1 is a surface formed to cut out the portion where the first virtual extended end surface VE1, which is obtained by expanding the first end surface E1 in the third direction DIR3, and the first virtual extended side surface VS1, which is obtained by expanding the first side surface S1 in the second direction DIR2, intersect, targeting the combination of the first end surface E1 and the first side surface S1 connected by the first notch surface NS1. The first virtual extended end surface VE1 is a surface obtained by expanding the first end surface E1 in the circumferential direction centered on the rotation axis of the brushless motor 100 when the magnetic core 1 is incorporated into the brushless motor 100. The first virtual extended side surface VS1 is a 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 notch surface NS1 is a plane, as shown in Figures 1 and 2. The region enclosed by the first virtual extension end face VE1, the first virtual extension side face VS1, and the first notch face NS1 is defined as the first region A1, as shown in Figure 2.

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

[0019] As shown in Figure 1, the tooth tip 32 has a third end face E3, a fourth end face E4, a third side surface S3, a fourth side surface S4, a second inner main surface IS2, and a second outer main surface OS2. The third end face E3 is the end face of the tooth tip 32 with respect to the second direction DIR2. The fourth end face E4 is the end face of the tooth tip 32 with respect to the opposite direction of the second direction DIR2. In this embodiment, the third end face E3 and the fourth end face E4 are both planar. The third end face E3 is located further in the second direction DIR2 than the fourth end face E4. The third end face E3 faces the second direction DIR2 when the magnetic core 1 is incorporated into the brushless motor 100. The fourth end face E4 faces the opposite direction of the second direction DIR2 when the magnetic core 1 is incorporated into the brushless motor 100. In other words, 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, respectively.

[0020] As shown in Figure 1, the third side S3 and the fourth side S4 are surfaces that connect the edges of the third end face E3 and the fourth end face E4 with respect to the third direction DIR3. The third side S3 is the end face of the tooth tip portion 32 with respect to the third direction DIR3. The fourth side S4 is the end face of the tooth tip portion 32 with respect to the opposite direction of the third direction DIR3. Therefore, the third side S3 and the fourth side S4 are aligned with the third direction DIR3 when the magnetic core 1 is incorporated into the brushless motor 100. That is, the tooth tip portion 32 has a third side S3 and a fourth side S4, which are two sides that are 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 S3 and the fourth side S4 are each flat surfaces.

[0021] As shown in Figure 1, the second inner main surface IS2 and the second outer main surface OS2 are surfaces that connect the edges of the third end surface E3 and the fourth end surface E4 with respect to the first direction DIR1. The second inner main surface IS2 is the end surface of the tooth tip 32 with respect to the first direction DIR1. The second outer main surface OS2 is the end surface of the tooth tip 32 with respect to the opposite direction of the first direction DIR1. Therefore, the second outer main surface OS2 and the second inner main surface IS2 are aligned with the first direction DIR1 when the magnetic core 1 is incorporated into the brushless motor 100. That is, the tooth tip 32 has the second inner main surface IS2 and the second outer main surface OS2, which are two main 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 main surface IS2 and the second outer main surface OS2 are planes.

[0022] (Configuration of the 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. Figure 3 is a perspective view of the coiled magnetic core 14. Figure 4 is a cross-sectional view of the core back portion 2 and the coil 13 viewed from the first direction DIR1.

[0023] As shown in Figure 3, the coiled magnetic core 14 comprises a magnetic core 1 and a coil 13.

[0024] As shown in Figure 3, the coil 13 is wound around the tooth body 31. The coil 13 is made of a conductive material such as copper. The coil 13 also has a structure in which the surface of the copper wire is covered with an insulating coating. Because the surface of the copper wire is covered with an insulating coating, the coil 13 and the magnetic core 1 are electrically insulated. 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 Figure 3, coil 13 has a first end E131 and a second end E132. The first end E131 and the second end E132 are the ends of coil 13, respectively. When the magnetic core 1 is incorporated into the brushless motor 100, electrical signals are supplied to the first end E131 and the second end E132 of coil 13 from a power source (not shown). At this time, the first end E131 and the second end E132 of coil 13 are fixed to a terminal block (not shown) located, for example, in the opposite direction from the first direction DIR1 to the core back portion 2. Coil 13 passes through the first region A1, as shown in Figures 3 and 4.

[0026] (Configuration of brushless motor 100) The configuration of a brushless motor 100 according to the first embodiment of the present invention will be described below with reference to the drawings. Figure 5 is an external perspective view of a brushless motor 100 using a magnetic core 1. Figure 6 is an exploded perspective schematic view of a brushless motor 100 using a magnetic core 1. In Figure 6, reference numerals are given only to representative magnetic cores 1, coils 13, and magnetic cores 14 with coils, respectively, from among the multiple magnetic cores 1, multiple coils 13, and multiple magnetic cores 14 with coils.

[0027] As shown in Figures 5 and 6, the brushless motor 100 comprises a rotor 20 and a stator assembly 10. As shown in Figure 6, the stator assembly 10 is positioned around the rotor 20 when viewed in the second direction DIR2. In other words, the brushless motor 100 is an inner rotor type.

[0028] As shown in Figure 6, the rotor 20 comprises 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. That is, the axis of rotation of the brushless motor 100 is the Z-axis. Therefore, the second direction DIR2 is the direction along the Z-axis.

[0029] As shown in Figure 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 about 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 about 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 about the Z-axis.

[0030] The soft magnetic material 23 is a soft magnetic material. The hard magnetic material 24 is a hard magnetic material. When a hard magnetic material is subjected to an external magnetic field, it becomes magnetized. Even after the magnetic field is removed, the hard magnetic material retains its magnetization. Such a hard magnetic material is a magnet.

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

[0032] The bearing 11 supports the shaft 21 so that it can rotate in the circumferential direction about the Z-axis. More specifically, the bearing 11 has a first bearing 11a and a second bearing 11b, as shown in Figure 6. 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 axis of each of the first bearing 11a and the second bearing 11b is the Z-axis. That is, the central axes of each of the first bearing 11a and the second bearing 11b coincide with the central axis of the shaft 21.

[0033] As shown in Figure 6, the second bearing 11b is located in the second direction DIR2 than the first bearing 11a. Opposite direction It is located in the second direction DIR than the rotor member 22. 2 The second bearing 11b is located in the second direction DIR2 relative to the rotor member 22. Opposite direction It is located in the second direction DIR2 of the shaft 21. Opposite direction Support the end.

[0034] The housing 12 has a first housing 12a and a second housing 12b, as shown in Figure 5. The first housing 12a is cylindrical, as shown in Figures 5 and 6. The central axis of the first housing 12a is the Z-axis. The first housing 12a is in the second direction DIR than the second housing 12b. 2 It is located. Also, the first housing 12a has an opening OP. This allows the second direction DIR of the shaft 21. 2 The end is in the second direction DIR from the opening OP. 2 It protrudes. In other words, the brushless motor 100 is a single-shaft type.

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

[0036] There are nine coiled magnetic cores 14. The nine coiled magnetic cores 14 are arranged in a circumferential direction centered on the Z-axis. The nine coiled magnetic cores 14 are positioned around the hard magnetic material 24, with some space between them.

[0037] The magnetic core 1 is magnetized by the magnetic field generated by the hard magnetic material 24 and the magnetic field generated by the coil 13, which will be described later. As shown in Figure 6, there is an air gap between the magnetic core 1 and the rotor member 22.

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

[0039] [effect] The magnetic core 1 provides a region from which both ends of the coil can be pulled out. More specifically, the first end face E1 and the first side surface S1 are connected via a first notch surface NS1. Therefore, the core back portion 2 has a shape in which the first end face E1 and the first side surface S1 are notched by the first notch surface NS1. This allows both ends of the coil 13 wound around the teeth portion 3 to be pulled out so that they pass through the region notched by the first notch surface NS1. As a result, the magnetic core 1 provides a region from which both ends of the coil can be pulled out.

[0040] Furthermore, with the magnetic core 1, the ends of the coil can be drawn out without increasing the size of the rotating electric machine. More specifically, the first notch surface NS1 is a surface formed to cut out the portion where the first virtual extended end surface VE1, which is obtained by extending the first end surface E1 in the third direction DIR3, and the first virtual extended side surface VS1, which is obtained by extending the first side surface S1 in the second direction DIR2, intersect, targeting the combination of the first end surface E1 and the first side surface S1 connected by the first notch surface NS1. As a result, the ends of the coil 13 can be drawn out so as to pass through the first region A1, which is the region enclosed by the first virtual extended end surface VE1, the first virtual extended side surface VS1, and the first notch surface NS1. Therefore, with the magnetic core 1, there is no need to secure a separate region from the magnetic core 1 in which the ends of the coil can be drawn out. Consequently, with the magnetic core 1, the ends of the coil can be drawn out without increasing the size of the rotating electric machine.

[0041] Furthermore, the magnetic core 1 makes it easier to form notched surfaces. More specifically, for example, when manufacturing a magnetic core by laminating electromagnetic steel sheets, cutting is required to form the first notched surface NS1 after laminating 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 notched surfaces.

[0042] Alternatively, when manufacturing a magnetic core by laminating electromagnetic steel sheets, a notched surface can be formed by pre-adjusting the width of the laminated electromagnetic steel sheets. In this case, the notched surface has a step. In this case, the insulating coating of the coil 13 may be damaged by contact with the corner of the step in the notched surface. 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 variation] The following describes the magnetic core 1a and the magnetic core with coil 14a according to the first modification of the present invention, with reference to the figures. Figure 7 is a perspective view of the magnetic core 1a according to the first modification of the present invention. Figure 8 is a cross-sectional view of the core back portion 2 and the coil 13 viewed from the first direction DIR1. Note that for the magnetic core 1a and the magnetic core with coil 14a according to the first modification, only the parts that differ from the magnetic core 1 and the magnetic core with coil 14 according to the first embodiment will be described, and the rest will be omitted.

[0044] As shown in Figures 7 and 8, the shape of the core back portion 2 of the magnetic core 1a and the magnetic core with coil differs from that of the magnetic core 1 and the magnetic core with coil, respectively, in that in all four combinations obtained by selecting and combining one from 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 face and the side face are connected by a notched surface.

[0045] In this modified example, as shown in Figures 7 and 8, the first end face E1 and the second side surface S2 are connected by the second notch surface NS2. Also, the second end face E2 and the first side surface S1 are connected by the third notch surface NS3. Furthermore, the second end face E2 and the second side surface S2 are connected by the fourth notch surface NS4. In addition, in this modified example, the first inner main surface IS1 and the first outer main surface OS1 are connected by the first notch surface NS1, the second notch surface NS2, the third notch surface NS3, and the fourth notch surface NS4, respectively.

[0046] As shown in Figure 8, the second notch surface NS2 is a surface formed by cutting out the portion where the first virtual extension end surface VE1, which is obtained by extending the first end surface E1 in the direction opposite to the third direction DIR3, and the second virtual extension side surface VS2, which is obtained by extending the second side surface S2 in the second direction DIR2, intersect, targeting the combination of the first end surface E1 and the second side surface S2 connected by the second notch surface NS2. In this modified example, the second notch surface NS2 is a plane, as shown in Figures 7 and 8. The region enclosed by the first virtual extension end surface VE1, the second virtual extension side surface VS2, and the second notch surface NS2 is defined as the second region A2, as shown in Figure 8.

[0047] As shown in Figure 8, the third notch surface NS3 is a surface formed by cutting out the portion where the second virtual extension end surface VE2, which is obtained by extending the second end surface E2 in the third direction DIR3, and the first virtual extension side surface VS1, which is obtained by extending the first side surface S1 in the direction opposite to the second direction DIR2, intersect, targeting the combination of the second end surface E2 and the first side surface S1 connected by the third notch surface NS3. In this modified example, the third notch surface NS3 is a plane, as shown in Figures 7 and 8. The region enclosed by the second virtual extension end surface VE2, the first virtual extension side surface VS1, and the third notch surface NS3 is defined as the third region A3, as shown in Figure 8.

[0048] As shown in Figure 8, the fourth notch surface NS4 is a surface formed by cutting out the portion where the second virtual extension end surface VE2, which is obtained by extending the second end surface E2 in the direction opposite to the third direction DIR3, and the second virtual extension side surface VS2, which is obtained by extending the second side surface S2 in the direction opposite to the second direction DIR2, intersect, targeting the combination of the second end surface E2 and the second side surface S2 connected by the fourth notch surface NS4. In this modified example, the fourth notch surface NS4 is a plane, as shown in Figures 7 and 8. The region enclosed by the second virtual extension end surface VE2, the second virtual extension side surface VS2, and the fourth notch surface NS4 is defined as the fourth region A4, as shown in Figure 8.

[0049] In this modified example, coil 13 passes through the first region A1 and the second region A2, respectively, as shown in Figure 8.

[0050] The magnetic core 1a described above also produces the same effect 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 each from the first end face E1 and the second end face E2, and the first side surface S1 and the second side surface S2, the end face and the side surface 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 improves the flexibility of the coil wiring layout. More specifically, in several of the four combinations obtained by selecting and combining one from 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 face and the side face are connected by a notched surface. Therefore, both ends of the coil 13 can be drawn out so as to pass 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 improves the flexibility of the coil wiring layout.

[0052] [Second variation] The following describes the magnetic core 1b and the magnetic core with coil 14b according to the second modification of the present invention, with reference to the figures. Figure 9 is a perspective view of the magnetic core 1b according to the second modification of the present invention. Figure 10 is a cross-sectional view of the core back portion 2 and the coil 13 viewed from the first direction DIR1. Note that for the magnetic core 1b and the magnetic core with coil 14b according to the second modification, only the parts that differ from the magnetic core 1a and the magnetic core with coil 14a according to the first modification will be described, and the rest will be omitted.

[0053] As shown in Figures 9 and 10, the magnetic core 1b and the magnetic core 14b with coil differ from the magnetic core 1a and the magnetic core 14a, respectively, in that 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, respectively.

[0054] In this modified example, coil 13 passes through the first region A1, as shown in Figure 10. On the other hand, coil 13 does not pass through the second region A2, the third region A3, or the fourth region A4. In other words, 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 produces the same effect as the magnetic core 1a. Furthermore, with the magnetic core 1b, it is possible to secure a region in which both ends of the coil can be pulled out while suppressing chipping of the core back portion. 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. As a result, the coil 13 can pass through the first region A1, which has the largest area. In addition, in several of the four combinations obtained by selecting and combining one each from the first end face E1 and the second end face E2, and the first side surface S1 and the second side surface S2, the end face and the side surface are connected by a notched surface. Therefore, chipping of the core back portion 2 can be suppressed. As a result, with the magnetic core 1b, it is possible to secure a region in which both ends of the coil can be pulled out while suppressing chipping of the core back portion.

[0056] [Third variation] The following describes a magnetic core 1c according to a third modification of the present invention with reference to the figures. Figure 11 is a perspective view of the magnetic core 1c according to the third modification of the present invention. Figure 12 is a cross-sectional view of the core back portion 2 viewed from the first direction DIR1. Note that only the parts of the magnetic core 1c according to the third modification that differ from the magnetic core 1 according to the first embodiment will be described, and the rest will be omitted.

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

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

[0059] [Fourth variation] The following describes a magnetic core 1d according to a fourth modification of the present invention with reference to the figures. Figure 13 is a perspective view of the magnetic core 1d according to the fourth modification of the present invention. Figure 14 is a cross-sectional view of the core back portion 2 viewed from the first direction DIR1. Note that only the parts of the magnetic core 1d according to the fourth modification that differ from the magnetic core 1 according to the first embodiment will be described, and the rest will be omitted.

[0060] As shown in Figures 13 and 14, the magnetic core 1d differs from the magnetic core 1 in that its first notched surface NS1 is convex. That is, the first notched surface NS1 is not limited to being planar, but may also be curved. In this modified example, the first notched surface NS1 is a convex surface that curves so as to project from the center of the core back portion 2 toward the point where the first virtual extended end surface VE1 and the first virtual extended side surface VS1 intersect, when viewed from the first direction DIR1.

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

[0062] [Fifth variation] The following describes a magnetic core 1e according to the fifth modification of the present invention with reference to the figures. Figure 15 is a perspective view of the magnetic core 1e according to the fifth modification of the present invention. Figure 16 is a cross-sectional view of the core back portion 2 viewed from the first direction DIR1. Note that only the parts of the magnetic core 1e according to the fifth modification that differ from the magnetic core 1 according to the first embodiment will be described, and the rest will be omitted.

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

[0064] The magnetic core 1e described above also produces the same effect as the magnetic core 1.

[0065] [Second Embodiment] Below, the magnetic core 1f and the magnetic core with coil 14f according to the second embodiment of the present invention will be described with reference to the figures. Figure 17 is a perspective view of the magnetic core 1f according to the second embodiment of the present invention. Figure 18 is a cross-sectional view of the tooth tip 32 in the first direction DIR1. Figure 19 is a perspective view of the magnetic core with coil 14f. Figure 20 is a cross-sectional view of the tooth tip 32 and the coil 13 in the first direction DIR1. Note that for the magnetic core 1f and the magnetic core with coil 14f according to the second embodiment, only the parts that differ from the magnetic core 1 and the magnetic core with coil 14 according to the first embodiment will be described, and the rest will be omitted.

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

[0067] The shape of the tooth tip portion 32 is such that, when considering four combinations obtained by selecting and combining one from each of the two end faces, the third end face E3 and the fourth end face E4, and the two side faces, the third side face S3 and the fourth side face S4, at least one of these four combinations has a shape in which 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 Figures 17 and 18, the third end face E3 and the third side face S3 are connected via a first notched surface NS1. Also 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] Book Embodiment As shown in Figure 18, the first notch surface NS1 is a surface formed to cut out the portion where the third virtual extension end surface VE3, which is obtained by expanding the third end surface E3 in the third direction DIR3, and the third virtual extension side surface VS3, which is obtained by expanding the third side surface S3 in the second direction DIR2, intersect, targeting the combination of the third end surface E3 and the third side surface S3 connected by the first notch surface NS1. The third virtual extension end surface VE3 is a surface obtained by expanding the third end surface E3 in the circumferential direction centered on the rotation axis of the brushless motor 100 when the magnetic core 1f is incorporated into the brushless motor 100. The third virtual extension side surface VS3 is 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 incorporated into the brushless motor 100. In this embodiment, the first notch surface NS1 is a plane, as shown in Figures 17 and 18. The region enclosed by the third virtual extension end face VE3, the third virtual extension side face VS3, and the first notch face NS1 is defined as the fifth region A5, as shown in Figure 18.

[0069] The first end E131 and the second end E132 of the coil 13 are each fixed to a terminal block (not shown) located, for example, in the first direction DIR1 relative to the tooth tip 32. The coil 13 passes through the fifth region A5, as shown in Figures 19 and 20.

[0070] The magnetic core 1f described above also produces the same effect as the magnetic core 1. More specifically, the third end face E3 and the third side surface S3 are connected via the first notched surface NS1. Therefore, the tooth tip 32 has a shape in which the third end face E3 and the third side surface S3 are notched by the first notched surface NS1. This allows both ends of the coil 13 wound around the tooth portion 3 to be pulled out so that they pass through the area notched by the first notched surface NS1. As a result, the magnetic core 1f provides an area in which both ends of the coil can be pulled out.

[0071] Furthermore, with the magnetic core 1f, the ends of the coil can be drawn out without increasing the size of the rotating electric machine. More specifically, the first notch surface NS1 is a surface formed to cut out the portion where the third virtual extension end surface VE3, which is obtained by expanding the third end surface E3 in the third direction DIR3, and the third virtual extension side surface VS3, which is obtained by expanding the third side surface S3 in the second direction DIR2, intersect, targeting the combination of the third end surface E3 and the third side surface S3 connected by the first notch surface NS1. As a result, the ends of the coil 13 can be drawn out so as to pass through the fifth region A5, which is the region enclosed by the third virtual extension end surface VE3, the third virtual extension side surface VS3, and the first notch surface NS1. Therefore, with the magnetic core 1f, there is no need to secure a separate region from the magnetic core 1f in which the ends of the coil can be drawn out. Consequently, with the magnetic core 1f, the ends of the coil can be drawn out without increasing the size of the rotating electric machine.

[0072] [Sixth variation] The following describes the magnetic core 1g and the magnetic core with coil 14g according to the sixth modification of the present invention, with reference to the figures. Figure 21 is a perspective view of the magnetic core 1g according to the sixth modification of the present invention. Figure 22 is a cross-sectional view of the tooth tip 32 and the coil 13 viewed in the first direction DIR1. Note that for the magnetic core 1g and the magnetic core with coil 14g according to the sixth modification, only the parts that differ from the magnetic core 1f and the magnetic core with coil 14f according to the second embodiment will be described, and the rest will be omitted.

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

[0074] In this modified example, as shown in Figures 21 and 22, the third end face E3 and the fourth side surface S4 are connected by the second notch surface NS2. Also, the fourth end face E4 and the third side surface S3 are connected by the third notch surface NS3. Furthermore, the fourth end face E4 and the fourth side surface S4 are connected by the fourth notch surface NS4. In this modified example, the second inner main surface IS2 and the second outer main surface OS2 are connected by the first notch surface NS1, the second notch surface NS2, the third notch surface NS3, and the fourth notch surface NS4, respectively.

[0075] In this modified example, the second notch surface NS2 is formed by cutting out the portion where the third virtual extension end surface VE3, which is obtained by extending the third end surface E3 in the direction opposite to the third direction DIR3, and the fourth virtual extension side surface VS4, which is obtained by extending the fourth side surface S4 in the second direction DIR2, intersect, targeting the combination of the third end surface E3 and the fourth side surface S4 connected by the second notch surface NS2, as shown in Figure 22. In this modified example, the second notch surface NS2 is a plane, as shown in Figures 21 and 22. The region enclosed by the third virtual extension end surface VE3, the fourth virtual extension side surface VS4, and the second notch surface NS2 is defined as the sixth region A6, as shown in Figure 22.

[0076] In this modified example, the third notch surface NS3 is formed by cutting out the portion where the fourth virtual extension end surface VE4, which is obtained by extending the fourth end surface E4 in the third direction DIR3, and the third virtual extension side surface VS3, which is obtained by extending the third side surface S3 in the opposite direction to the second direction DIR2, intersect, targeting the combination of the fourth end surface E4 and the third side surface S3 connected by the third notch surface NS3. In this modified example, the third notch surface NS3 is a plane, as shown in Figures 21 and 22. The region enclosed by the fourth virtual extension end surface VE4, the third virtual extension side surface VS3, and the third notch surface NS3 is defined as the seventh region A7, as shown in Figure 22.

[0077] In this modified example, the fourth notch surface NS4 is formed by cutting out the portion where the fourth virtual extension end surface VE4, which is obtained by extending the fourth end surface E4 in the direction opposite to the third direction DIR3, and the fourth virtual extension side surface VS4, which is obtained by extending the fourth side surface S4 in the direction opposite to the second direction DIR2, intersect, targeting the combination of the fourth end surface E4 and the fourth side surface S4 connected by the fourth notch surface NS4, as shown in Figure 22. In this modified example, the fourth notch surface NS4 is a plane, as shown in Figures 21 and 22. The region enclosed by the fourth virtual extension end surface VE4, the fourth virtual extension side surface VS4, and the fourth notch surface NS4 is defined as the eighth region A8, as shown in Figure 22.

[0078] In this modified example, coil 13 passes through the fifth region A5 and the sixth region A6, respectively, as shown in Figure 22.

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

[0080] Furthermore, the magnetic core 1g improves the flexibility of the coil wiring layout. More specifically, in several of the four combinations obtained by selecting and combining one each from the third end face E3 and the fourth end face E4, and 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 led out so as to pass 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 improves the flexibility of the coil wiring layout.

[0081] [Seventh variation] The following describes the magnetic core 1h and the magnetic core with coil 14h according to the seventh modification of the present invention, with reference to the figures. Figure 23 is a perspective view of the magnetic core 1h according to the seventh modification of the present invention. Figure 24 is a cross-sectional view of the tooth tip 32 and the coil 13 viewed in the first direction DIR1. Note that for the magnetic core 1h and the magnetic core with coil 14h according to the seventh modification, only the parts that differ from the magnetic core 1f and the magnetic core with coil 14f according to the second embodiment will be described, and the rest will be omitted.

[0082] As shown in Figures 23 and 24, the magnetic core 1h and the magnetic core 14h with coil differ from the magnetic core 1f and the magnetic core 14f, respectively, in that 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, respectively.

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

[0084] The magnetic core 1h described above also produces the same effect as the magnetic core 1f. Furthermore, with the magnetic core 1h, it is possible to secure a region in which both ends of the coil can be pulled out while suppressing chipping of the tooth tip. 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. As a result, the coil 13 can pass through the fifth region A5, which is the region with the largest area. In addition, in several of the four combinations obtained by selecting and combining one each from the third end face E3 and the fourth end face E4 and the third side surface S3 and the fourth side surface S4, the end face and the side surface are connected by a notched surface. Therefore, chipping of the tooth tip 32 can be suppressed. As a result, with the magnetic core 1h, it is possible to secure a region in which both ends of the coil can be pulled out while suppressing chipping of the tooth tip.

[0085] [Variation 8] The magnetic core 1i according to the eighth modified embodiment of the present invention will be described below with reference to the figures. Figure 25 is a perspective view of the magnetic core 1i according to the eighth modified embodiment of the present invention. Figure 26 is a cross-sectional view of the tooth tip portion 32 viewed in the first direction DIR1. Note that only the parts of the magnetic core 1i according to the eighth modified embodiment that differ from the magnetic core 1f according to the second embodiment will be described, and the rest will be omitted.

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

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

[0088] [9th variation] The magnetic core 1j according to the ninth modified embodiment of the present invention will be described below with reference to the figures. Figure 27 is a perspective view of the magnetic core 1j according to the ninth modified embodiment of the present invention. Figure 28 is a cross-sectional view of the tooth tip portion 32 viewed in the first direction DIR1. Note that only the parts of the magnetic core 1j according to the ninth modified embodiment that differ from the magnetic core 1f according to the second embodiment will be described, and the rest will be omitted.

[0089] As shown in Figures 27 and 28, the magnetic core 1j differs from the magnetic core 1f in that its first notched surface NS1 is convex. That is, the first notched surface NS1 is not limited to being planar, but may also be curved. In this modified example, the first notched surface NS1 is a convex surface that curves so as to protrude from the center of the tooth tip portion 32 toward the point where the third virtual extended end surface VE3 and the third virtual extended side surface VS3 intersect, when viewed in the first direction DIR1.

[0090] The magnetic core 1j described above also produces the same effect as the magnetic core 1f. Furthermore, the magnetic core 1j can further suppress chipping at the tip of the tooth.

[0091] [Tenth variation] The following describes a magnetic core 1k according to the tenth modified embodiment of the present invention with reference to the figures. Figure 29 is a perspective view of the magnetic core 1k according to the tenth modified embodiment of the present invention. Figure 30 is a cross-sectional view of the tooth tip portion 32 viewed in the first direction DIR1. Note that only the parts of the magnetic core 1k according to the tenth modified embodiment that differ from the magnetic core 1f according to the second embodiment will be described, and the rest will be omitted.

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

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

[0094] [Other embodiments] The magnetic core according to the present invention is not limited to magnetic cores 1, 1a to 1k, but can be modified within the scope of its gist. Furthermore, the structures of magnetic cores 1, 1a to 1k may be arbitrarily combined.

[0095] The coiled magnetic core according to the present invention is not limited to the coiled magnetic cores 14, 14a to 14k, each comprising a magnetic core 1, 1a to 1k and a coil 13, but can be modified within the scope of its gist. Furthermore, the structures of the coiled magnetic cores 14, 14a to 14k may be arbitrarily combined.

[0096] Furthermore, a rotating electric machine only needs to have a structure in which the rotor rotates electrically, 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 only needs to have at least one of the magnetic cores 1, 1a to 1k, and may also have brushes.

[0097] Furthermore, the first direction DIR1 does not necessarily have to be oriented in the opposite direction to the radial direction centered on the rotation axis of the brushless motor 100 when the magnetic core 1 is incorporated into the brushless motor 100.

[0098] Note that the first end face E1, the second end face E2, the third end face E3, and the fourth end face E4 do not necessarily have to be flat. Also, the first side surface S1, the second side surface S2, the third side surface S3, and the fourth side surface S4 do not necessarily have to be flat. Furthermore, 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 necessarily have to be flat.

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

[0100] The brushless motor 100 may also be of the outer rotor type.

[0101] Furthermore, the brushless motor 100 is not limited to a single-shaft type. For example, the brushless motor 100 may be a double-shaft type.

[0102] Note that the first bearing 11a and the second bearing 11b are not limited to ball bearings.

[0103] Furthermore, the materials used for the first housing 12a and the second housing 12b can be any material with high rigidity.

[0104] Furthermore, the number of coiled magnetic cores 14 is not limited to nine.

[0105] In addition, in both the magnetic core 1 and the magnetic core 14 with a coil, 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 core back portion 2 instead of the first notch surface NS1.

[0106] Furthermore, in the coiled magnetic core 14a, the coil 13 does not necessarily need 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] Furthermore, in both the magnetic core 1b and the coiled magnetic core 14b, 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. More specifically, in all four combinations (the combination of the first end face E1 and the first side surface S1, the combination of the first end face E1 and the second side surface S2, the combination of the second end face E2 and the first side surface S1, and the combination of the second end face E2 and the second side surface S2), the end face and the side surface do not need to be connected by a notched surface; it is sufficient if the end face and the side surface are connected by a notched surface in some of the four combinations. Also, 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 areas of the first region A1, the third region A3, and 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] Furthermore, in the magnetic core 1c, the first notch 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 notch 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 point where the first virtual extended end surface VE1 and the first virtual extended side surface VS1 intersect, when viewed from the first direction DIR1.

[0110] Furthermore, the second inner main surface IS2 and the second outer main surface OS2 do not have to be connected by the first notch surface NS1. Also, the second inner main surface IS2 and the second outer main surface OS2 do not have to be connected by the second notch surface NS2. Also, the second inner main surface IS2 and the second outer main surface OS2 do not have to be connected by the third notch surface NS3. Also, the second inner main surface IS2 and the second outer main surface OS2 do not have to be connected by the fourth notch surface NS4.

[0111] In addition, in both the magnetic core 1f and the magnetic core 14f with coil, 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 instead of the first notch surface NS1.

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

[0113] Furthermore, in both the magnetic core 1h and the magnetic core 14h with a coil, the area of ​​the fifth region A5 does not have to be larger than the area of ​​the sixth region A6, the seventh region A7, and the eighth region A8. More specifically, in all four combinations (the combination of the third end face E3 and the third side surface S3, the combination of the third end face E3 and the fourth side surface S4, the combination of the fourth end face E4 and the third side surface S3, and the combination of the fourth end face E4 and the fourth side surface S4), the end face and the side surface do not need to be connected by a notched surface; it is sufficient if the end face and the side surface are connected by a notched surface in some 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. 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 has the largest area.

[0114] In addition, in the magnetic core 1i, the first notch 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 notch 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 point where the third virtual extended end surface VE3 and the third virtual extended side surface VS3 intersect, when viewed in the first direction DIR1.

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

[0117] The magnetic cores 1, 1a to 1k may also be manufactured by laminating electrical steel sheets.

[0118] The present invention has the following configuration.

[0119] (1) A magnetic core for use in a rotating electrical machine, comprising a core back portion and a teeth portion, The core back portion is, When the magnetic core is incorporated into the rotating electric machine, it has two end faces that face in the axial direction along the rotation axis of the rotating electric machine, and in the direction opposite to the axial direction, When the magnetic core is incorporated into the rotating electric machine, there are two sides that are aligned in the circumferential direction with respect to the rotation axis, It has, When considering the four possible combinations of the core back portion obtained by selecting and combining one of the two end faces and one of the two side faces, at least one of these four combinations has a shape in which the end face and the side face are connected via a notched surface. Magnetic core.

[0120] (2) The notched surface is formed to cut out the portion where a virtual extended end face, obtained by widening the end face in the circumferential direction, and a virtual extended side face, obtained by widening the side face in the axial direction, intersect, with respect to the combination of the end face and the side face connected by the notched surface. (1) The magnetic core described above.

[0121] (3) In all of the above four combinations, the end face and the side face are connected by the notched surface. (2) The magnetic core described above.

[0122] (4) In some of the four combinations mentioned above, the end face and the side face are connected by the notched surface. In one of the above-mentioned combinations, the area of ​​the region enclosed by the virtual extended end face, the virtual extended side face, and the notched face is larger than the area in the other combinations. (2) or (3) the magnetic core described above.

[0123] (5) The aforementioned notched surface includes a plane, A magnetic core as described in any of (1) to (4).

[0124] (6) The aforementioned notched surface includes a convex surface. A magnetic core as described in any of (1) to (5).

[0125] (7) (2) or (3) the magnetic core, Coil and, It is equipped with, The coil is wound around the teeth portion. The coil passes through the region enclosed by the virtual extended end face, the virtual extended side face, and the notched face. Magnetic core with coil.

[0126] (8) (4) The magnetic core described above, Coil and, It is equipped with, The coil is wound around the teeth portion. The coil passes through the region with the largest area. Magnetic core with coil.

[0127] (9) A magnetic core for use in a rotating electrical machine, comprising a core back portion and a teeth portion, The aforementioned teeth portion is, It includes a tooth body portion that extends from the core back portion toward the rotor of the rotating electric machine when the magnetic core is incorporated into the rotating electric machine, and a tooth tip portion formed at the tip of the tooth body portion. The tip of the tooth is, When the magnetic core is incorporated into the rotating electric machine, it has two end faces that face in the axial direction along the rotation axis of the rotating electric machine, and in the direction opposite to the axial direction, When the magnetic core is incorporated into the rotating electric machine, there are two sides that are aligned in the circumferential direction with respect to the rotation axis, It has, When considering the shape of the tip of the tooth, if we consider the four combinations obtained by selecting and combining one from each of the two end faces and the two side faces, in at least one of these four combinations, the end face and the side face are connected via a notched surface. Magnetic core.

[0128] (10) The notched surface is formed to cut out the portion where a virtual extended end face, obtained by widening the end face in the circumferential direction, and a virtual extended side face, obtained by widening the side face in the axial direction, intersect, with respect to the combination of the end face and the side face connected by the notched surface. (9) The magnetic core described above.

[0129] (11) In all of the above four combinations, the end face and the side face are connected by the notched surface. (10) The magnetic core described above.

[0130] (12) In some of the four combinations mentioned above, the end face and the side face are connected by the notched surface. In one of the above-mentioned combinations, the area of ​​the region enclosed by the virtual extended end face, the virtual extended side face, and the notched face is larger than the area in the other combinations. A magnetic core as described in (10) or (11).

[0131] (13) The aforementioned notched surface includes a plane, A magnetic core as described in any of (9) to (12).

[0132] (14) The aforementioned notched surface includes a convex surface. A magnetic core as described in any of (9) to (13).

[0133] (15) A magnetic core as described in (10) or (11), Coil and, It is equipped with, The coil is wound around the tooth body portion. The coil passes through the region enclosed by the virtual extended end face, the virtual extended side face, and the notched face. Magnetic core with coil.

[0134] (16) (12) The magnetic core described above, Coil and, It is equipped with, The coil is wound around the tooth body portion. The coil passes through the region with the largest area. Magnetic core with coil.

[0135] (17) It is a molded body formed from soft magnetic powder. A magnetic core as described in any of (1) through (6), or any of (9) through (14).

[0136] (18) (1) to (6), (9) to (14), or (17) comprising a magnetic core, Rotating electrical machinery. [Explanation of Symbols]

[0137] 1,1a,1b,1c,1d,1e,1f,1g,1h,1i,1j,1k: Magnetic core 2: Core back section 3: Teeth Department 10: Stator Assembly 11: Bearings 11a: First bearing 11b: Second bearing 12: Cabinet 12a: First enclosure 12b: Second cabinet 13: Coil 14, 14a, 14b, 14c, 14d, 14e, 14f, 14g, 14h, 14i, 14j, 14k: Magnetic material with coil a 2 0: Rotor 21: Shaft 22: Rotor component 23: Soft magnetic material 24:Hard magnetic material 31: Teeth main body 32: Tooth tip 100: Brushless motor A1:First area A2:Second area A3: Third area A4: 4th area A5: 5th area A6: Area 6 A7: Area 7 A8: 8th area DIR1: 1st direction DIR2:Second direction DIR3: Third direction E131: 1st end E132: 2nd end E1: 1st end surface E2: 2nd end face E3: 3rd end face E4: 4th end face IS1: First Inner Main Surface IS2: Second Inner Main Surface NS1: First notched surface NS2: 2nd notch surface NS3: Third notched surface NS4: 4th notch surface OP: Opening OS1: First outer main surface OS2: Second outer main surface S1: 1st side S2:Second side S3: Third aspect S4: 4th aspect VE1: First virtual extension end face VE2: Second virtual extension end face VE3: Third virtual extension end face VE4: Fourth virtual extension end face VS1: First virtual extension side VS2: Second virtual extension side VS3: Third virtual extension side VS4: Fourth virtual extension side

Claims

1. A magnetic core for use in a rotating electrical machine, comprising a core back portion and a teeth portion, The core back portion is When the magnetic core is incorporated into the rotating electric machine, it has two end faces that face in the axial direction along the rotation axis of the rotating electric machine, and in the direction opposite to the axial direction, When the magnetic core is incorporated into the rotating electric machine, there are two sides that are aligned in the circumferential direction with respect to the rotation axis, When the magnetic core is incorporated into the rotating electric machine, the outer main surface connecting the edges of the two end faces in the radial direction with respect to the axis of rotation, When the magnetic core is incorporated into the rotating electric machine, the inner main surface connects the edges of the two end faces in opposite radial directions, It has, When considering the four possible combinations of the core back portion obtained by selecting and combining one of the two end faces and the two side faces, at least one of these four combinations has a shape in which the end face, the side face, the outer main surface, and the inner main surface are connected via a notched surface. Magnetic core.

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

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

4. In some of the four combinations mentioned above, the end face and the side face are connected by the notched surface. In one of the above-mentioned combinations, the area of ​​the region enclosed by the virtual extended end face, the virtual extended side face, and the notched face is larger than the area in the other combinations. A magnetic core according to claim 2 or claim 3.

5. The aforementioned notched surface includes a plane, A magnetic core according to any one of claims 1 to 3.

6. The aforementioned notched surface includes a convex surface. A magnetic core according to any one of claims 1 to 3.

7. A magnetic core according to claim 2 or claim 3, Coil and, It is equipped with, The coil is wound around the teeth portion. The coil passes through the region enclosed by the virtual extended end face, the virtual extended side face, and the notched face. Magnetic core with coil.

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

9. A magnetic core for use in a rotating electrical machine, comprising a core back portion and a teeth portion, The aforementioned teeth portion is, It includes a tooth body portion that extends from the core back portion toward the rotor of the rotating electric machine when the magnetic core is incorporated into the rotating electric machine, and a tooth tip portion formed at the tip of the tooth body portion. The tip of the tooth is, When the magnetic core is incorporated into the rotating electric machine, it has two end faces that face in the axial direction along the rotation axis of the rotating electric machine, and in the direction opposite to the axial direction, When the magnetic core is incorporated into the rotating electric machine, there are two sides that are aligned in the circumferential direction with respect to the rotation axis, It has, When considering the shape of the tooth tip, if we consider the four combinations obtained by selecting and combining one from each of the two end faces and the two side faces, in at least one of these four combinations, the end face and the side face are connected via a notched surface. Magnetic core.

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

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

12. In some of the four combinations mentioned above, the end face and the side face are connected by the notched surface. In one of the above-mentioned combinations, the area of ​​the region enclosed by the virtual extended end face, the virtual extended side face, and the notched face is larger than the area in the other combinations. A magnetic core according to claim 10 or claim 11.

13. The aforementioned notched surface includes a plane, A magnetic core according to any one of claims 9 to 11.

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

15. A magnetic core according to claim 10 or claim 11, Coil and, It is equipped with, The coil is wound around the tooth body portion. The coil passes through the region enclosed by the virtual extended end face, the virtual extended side face, and the notched face. Magnetic core with coil.

16. A magnetic core according to claim 12, Coil and, It is equipped with, The coil is wound around the tooth body portion. The coil passes through the region with the largest area. Magnetic core with coil.

17. A magnetic core for use in a rotating electric machine, comprising a core back portion and a teeth portion, The core back portion is When the magnetic core is incorporated into the rotating electric machine, it has two end faces that face in the axial direction along the rotation axis of the rotating electric machine, and in the direction opposite to the axial direction, When the magnetic core is incorporated into the rotating electric machine, there are two sides that are aligned in the circumferential direction with respect to the rotation axis, It has, When considering the four combinations of the core back portion obtained by selecting and combining one from each of the two end faces and the two side faces, in all four combinations, the end face and the side face are connected by a notched surface. The notched surface is formed to cut out the portion where a virtual extended end face, obtained by widening the end face in the circumferential direction, and a virtual extended side face, obtained by widening the side face in the axial direction, intersect, with respect to the combination of the end face and the side face connected by the notched surface. Magnetic core.

18. A magnetic core according to claim 17, Coil and, It is equipped with, The coil is wound around the teeth portion. The coil passes through the region enclosed by the virtual extended end face, the virtual extended side face, and the notched face. 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 When the magnetic core is incorporated into the rotating electric machine, it has two end faces that face in the axial direction along the rotation axis of the rotating electric machine, and in the direction opposite to the axial direction, When the magnetic core is incorporated into the rotating electric machine, there are two sides that are aligned in the circumferential direction with respect to the rotation axis, It has, When considering the four combinations of the core back portion obtained by selecting and combining one from each of the two end faces and the two side faces, in at least one of these four combinations, the end face and the side face are connected via a notched surface. The notched surface is formed to cut out the portion where a virtual extended end face, obtained by widening the end face in the circumferential direction, and a virtual extended side face, obtained by widening the side face in the axial direction, intersect, with respect to the combination of the end face and the side face connected by the notched surface. In some of the four combinations mentioned above, the end face and the side face are connected by the notched surface. In one of the above-mentioned combinations, the area of ​​the region enclosed by the virtual extended end face, the virtual extended side face, and the notched face is larger than the area in the other combinations. Magnetic core.

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

21. It is a molded body formed from soft magnetic powder. A magnetic core according to any one of claims 1 to 3, 9 to 11, 17, and 19.

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

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