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

Abstract

A magnetic core, a magnetic core with a coil, and a rotating electrical machine are provided. The magnetic core is provided with an iron core back part and a tooth part, and is used in a rotary electric machine. The core back has: two end surfaces facing, when the magnetic core is assembled in the rotating electrical machine, an axial direction along a rotational axis of the rotating electrical machine and a direction opposite to the axial direction, respectively; and two side surfaces arranged in a circumferential direction centered on the rotation axis when the magnetic core is assembled in the rotating electrical machine. The shape of the core back is a shape in which the end surfaces and the side surfaces are connected via cutout surfaces in at least any one of four combinations obtained by selecting and combining one of the two end surfaces and the two side surfaces, in consideration of the four combinations.

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 existing invention related to a 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 a tooth portion. A coil is wound around the tooth portion. The yoke portion has two end faces that face in an axial direction along the rotation axis of the rotating electric machine and in a direction opposite to the axial direction when the stator core is assembled in the rotating electric machine.

[0003] Patent Document 1: Japanese Patent Application Publication No. 2006-158176

[0004] In the stator core described in Patent Document 1, it is desirable to ensure regions at both end portions from which the coils can be led out. Summary of the invention

[0005] Therefore, an object of the present invention is to provide a magnetic core, a magnetic core with a coil, and a rotating electric machine that can ensure regions where both end portions of a coil can be led out.

[0006] A magnetic core according to one embodiment of the present invention comprises a core back and a tooth portion, and is used in a rotating electrical machine. In the magnetic core, the core back has: two end faces which face in an axial direction and in a direction opposite to the axial direction along the rotation axis of the rotating electrical machine, respectively, when the magnetic core is assembled in the rotating electrical machine; and two side faces which are arranged in a circumferential direction around the rotation axis when the magnetic core is assembled in the rotating electrical machine. The shape of the core back is a shape in which the end face and the side face are connected via a notch face in at least any one of the four combinations obtained by selecting one end face and one side face respectively and combining them.

[0007] A magnetic core according to one embodiment of the present invention comprises a core back and a tooth portion, and is used in a rotating electrical machine. In the magnetic core, the tooth portion comprises: a tooth body portion, which, when the magnetic core is assembled in the rotating electrical machine, extends from the core back toward the rotor of the rotating electrical machine; and a tooth tip portion, which is formed at the tip of the tooth body portion, and the tooth tip portion comprises: two end faces which, when the magnetic core is assembled in the rotating electrical machine, face the axial direction and the direction opposite to the axial direction along the rotating electrical machine's rotation axis, respectively; and two side faces which are arranged in a circumferential direction around the rotating electrical machine's rotation axis when the magnetic core is assembled in the rotating electrical machine, the shape of the tooth tip portion being a shape in which, in at least any one of four combinations obtained by selecting and combining each of the two end faces and the two side faces, the end faces and the side faces are connected via a notch face.

[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 regions where both end portions of a coil can be led out. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] Figure 1 It is a perspective view of the magnetic core 1 according to the first embodiment of the present invention.

[0010] Figure 2 This is a cross-sectional view of the core back 2 as viewed from the first direction DIR1.

[0011] Figure 3 It is a perspective view of the magnetic core 14 with a coil.

[0012] Figure 4 This is a cross-sectional view of the core back 2 and the coil 13 as viewed from the first direction DIR1.

[0013] Figure 5 1 is a perspective view of the appearance of a brushless motor 100 using the magnetic core 1 .

[0014] Figure 6 It is an exploded perspective schematic diagram of a brushless motor 100 using the magnetic core 1 .

[0015] Figure 7 It is a perspective view of a magnetic core 1 a according to a first modified example of the present invention.

[0016] Figure 8 This is a cross-sectional view of the core back 2 and the coil 13 as viewed from the first direction DIR1.

[0017] Fig. 9 It is a perspective view of a magnetic core 1b according to a second modified example of the present invention.

[0018] Fig.10 This is a cross-sectional view of the core back 2 and the coil 13 as viewed from the first direction DIR1.

[0019] Fig.11 It is a perspective view of a magnetic core 1c according to a third modified example of the present invention.

[0020] Fig.12 This is a cross-sectional view of the core back 2 as viewed from the first direction DIR1.

[0021] Fig.13 It is a perspective view of a magnetic core 1d according to a fourth modified example of the present invention.

[0022] Fig.14 This is a cross-sectional view of the core back 2 as viewed from the first direction DIR1.

[0023] Fig.15 It is a perspective view of a magnetic core 1e according to a fifth modified example of the present invention.

[0024] Fig.16 This is a cross-sectional view of the core back 2 as viewed from the first direction DIR1.

[0025] Fig.17 It is a perspective view of a magnetic core 1f according to a second embodiment of the present invention.

[0026] Fig.18 This is a cross-sectional view of the tooth tip portion 32 as viewed in the first direction DIR1.

[0027] Fig.19 It is a perspective view of the magnetic core 14f with a coil.

[0028] Fig. 20 This is a cross-sectional view of the tooth tip portion 32 and the coil 13 as viewed in the first direction DIR1.

[0029] Fig.21 It is a perspective view of a magnetic core 1g according to a sixth modified example of the present invention.

[0030] Fig. 22 This is a cross-sectional view of the tooth tip portion 32 and the coil 13 as viewed in the first direction DIR1.

[0031] Fig.23 It is a perspective view of a magnetic core 1h according to a seventh modification of the present invention.

[0032] Fig.24 This is a cross-sectional view of the tooth tip portion 32 and the coil 13 as viewed in the first direction DIR1.

[0033] Fig.25 It is a perspective view of a magnetic core 1i according to an eighth modified example of the present invention.

[0034] Fig.26 This is a cross-sectional view of the tooth tip portion 32 as viewed in the first direction DIR1.

[0035] Fig. 27 It is a perspective view of a magnetic core 1j according to a ninth modified example of the present invention.

[0036] Fig.28 This is a cross-sectional view of the tooth tip portion 32 as viewed in the first direction DIR1.

[0037] Fig.29 It is a perspective view of a magnetic core 1k according to a tenth modified example of the present invention.

[0038] Fig.30 This is a cross-sectional view of the tooth tip portion 32 as viewed in the first direction DIR1. DETAILED DESCRIPTION

[0039] [First embodiment]

[0040] (Structure of magnetic core 1)

[0041] Figure 1 1 is a perspective view of a magnetic core 1 according to a first embodiment of the present invention. Figure 1 As shown, the magnetic core 1 includes a core back 2 and a tooth portion 3. The tooth portion 3 has a shape extending from the core back 2 in the first direction DIR1. The tooth portion 3 includes: a tooth body portion 31 extending from the core back 2 in the first direction DIR1 and a tooth terminal portion 32 formed at the terminal of the tooth body portion 31 in the first direction DIR1. The coil 13 is wound on the tooth portion 3. In more detail, the coil 13 is wound on the tooth body portion 31 as described later. Such a magnetic core 1 of the present embodiment is used in a brushless motor 100 (an example of a "rotating electrical machine" of the present invention. Refer to Figure 3 and Figure 4 ). Moreover, when the magnetic core 1 is assembled in the brushless motor 100, the first direction DIR1 is oriented in the opposite direction of the radial direction centered on the rotation axis of the brushless motor 100. Furthermore, when the magnetic core 1 is assembled in the brushless motor 100, the second direction DIR2 is oriented in the axial direction along the rotation axis of the brushless motor 100. Furthermore, when the magnetic core 1 is assembled in the brushless motor 100, the opposite direction of the second direction DIR2 is also oriented in the axial direction along the rotation axis of the brushless motor 100. Furthermore, when the magnetic core 1 is assembled in the brushless motor 100, the third direction DIR3 is oriented in the circumferential direction centered on the rotation axis of the brushless motor 100. Furthermore, when the magnetic core 1 is assembled in the brushless motor 100, the opposite direction of the third direction DIR3 is also oriented in the circumferential direction centered on the rotation axis of the brushless motor 100. This will be described in detail below.

[0042] The magnetic core 1 is a soft magnetic body. The soft magnetic body is magnetized when a magnetic field is applied from the outside. Thereafter, when the application of the magnetic field is stopped, the soft magnetic body loses its magnetization. The material of such a soft magnetic body is, for example, iron.

[0043] The magnetic core 1 is a molded body formed of soft magnetic powder. That is, the core back 2 and the tooth portion 3 are each a molded body formed of 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 material obtained by mixing iron powder and an epoxy resin as an example of a binder. Such a magnetic core 1 is made, for example, by press molding. In addition, the outer surface of the magnetic core 1 that contacts other components when the stator 15 is assembled in the brushless motor 100 is subjected to insulation treatment.

[0044] like Figure 1 As shown, the core back 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 face IS1, and a first outer main face OS1. The first end face E1 is an end face of the core back 2 in the second direction DIR2. The second end face E2 is an end face of the core back 2 in the opposite direction to the second direction DIR2. In the present embodiment, the first end face E1 and the second end face E2 are each planes. 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 assembled in the brushless motor 100, the first end face E1 faces the second direction DIR2. In addition, when the magnetic core 1 is assembled in the brushless motor 100, the second end face E2 faces the opposite direction to the second direction DIR2. That is, the core back 2 has two end faces, namely, a first end face E1 and a second end face E2 , which face in the axial direction along the rotation axis of the brushless motor 100 and in the direction opposite to the axial direction, respectively, when the core 1 is assembled in the brushless motor 100 .

[0045] like Figure 1 As shown, the first side surface S1 and the second side surface S2 are each a surface that connects the end edges of the first end surface E1 and the second end surface E2 in the third direction DIR3. The first side surface S1 is the end surface of the core back 2 in the third direction DIR3. The second side surface S2 is the end surface of the core back 2 in the opposite direction to the third direction DIR3. Therefore, when the magnetic core 1 is assembled in the brushless motor 100, the first side surface S1 and the second side surface S2 are arranged in the third direction DIR3. That is, the core back 2 has: when the magnetic core 1 is assembled in the brushless motor 100, two side surfaces, namely, the first side surface S1 and the second side surface S2, are arranged in the circumferential direction centered on the rotation axis of the brushless motor 100. In the present embodiment, the first side surface S1 and the second side surface S2 are each a plane.

[0046] like Figure 1As shown, the first inner principal surface IS1 and the first outer principal surface OS1 are surfaces that connect the end 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 the end surface of the core back 2 in the first direction DIR1. The first outer principal surface OS1 is the end surface of the core back 2 in the opposite direction to the first direction DIR1. Therefore, when the magnetic core 1 is assembled in the brushless motor 100, the first outer principal surface OS1 and the first inner principal surface IS1 are arranged in the first direction DIR1. That is, the core back 2 has: when the magnetic core 1 is assembled in the brushless motor 100, two principal surfaces, namely, the first inner principal surface IS1 and the first outer principal surface OS1, are arranged in the radial direction of the rotation axis of the brushless motor 100. In the present embodiment, the first inner principal surface IS1 and the first outer principal surface OS1 are each a plane.

[0047] Figure 2 It is a cross-sectional view of the core back 2 as viewed from the first direction DIR1. The shape of the core back 2 is a shape in which the end face and the side face are connected via a notch face in at least any one of the four combinations, taking into account four combinations obtained by selecting one from each of the first end face E1 and the second end face E2 as two end faces and the first side face S1 and the second side face S2 as two side faces. Specifically, the four combinations considered are a combination of the first end face E1 and the first side face S1, a combination of the first end face E1 and the second side face S2, a combination of the second end face E2 and the first side face S1, and a combination of the second end face E2 and the second side face S2. In this embodiment, as Figure 1 and Figure 2 As shown, the first end surface E1 and the first side surface S1 are connected via the first notch surface NS1. In the present embodiment, the first inner main surface IS1 and the first outer main surface OS1 are connected via the first notch surface NS1.

[0048] like Figure 2 As shown, the first notch surface NS1 is a surface formed by cutting off the intersecting portion of the first imaginary extended end surface VE1 obtained by extending the first end surface E1 in the third direction DIR3 and the first imaginary extended side surface VS1 obtained by extending the first side surface S1 in the second direction DIR2, taking the combination of the first end surface E1 and the first side surface S1 connected by the first notch surface NS1 as the object. In addition, the first imaginary extended end surface VE1 only needs to be a surface obtained by extending 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 assembled in the brushless motor 100. In addition, the first imaginary extended side surface VS1 only needs to be a surface obtained by extending the first side surface S1 in the axial direction along the rotation axis of the brushless motor 100 when the magnetic core 1 is assembled in the brushless motor 100. In this embodiment, as Figure 1 and Figure 2As shown in FIG. 1 , the first notch surface NS1 is a plane. Figure 2 As shown in FIG. 1 , a region surrounded by the first imaginary extended end surface VE1 , the first imaginary extended side surface VS1 , and the first notch surface NS1 is defined as a first region A1 .

[0049] like Figure 1 As shown, the tooth body portion 31 extends in the first direction DIR1 from the first inner main surface IS1 of the core back 2. When the core 1 is assembled in the brushless motor 100, the tooth body portion 31 is in a state of extending from the core back 2 toward the rotor of the brushless motor 100. In the present embodiment, the tooth body portion 31 is in a rectangular parallelepiped shape.

[0050] like Figure 1 As shown, the tooth end portion 32 has a third end face E3, a fourth end face E4, a third side face S3, a fourth side face S4, a second inner main face IS2, and a second outer main face OS2. The third end face E3 is an end face of the tooth end portion 32 in the second direction DIR2. The fourth end face E4 is an end face of the tooth end portion 32 in the opposite direction to the second direction DIR2. In the present embodiment, the third end face E3 and the fourth end face E4 are each planes. The third end face E3 is located closer to the second direction DIR2 than the fourth end face E4. When the magnetic core 1 is assembled in the brushless motor 100, the third end face E3 faces the second direction DIR2. In addition, when the magnetic core 1 is assembled in the brushless motor 100, the fourth end face E4 faces the opposite direction to the second direction DIR2. That is, the tooth tip portion 32 has two end faces, namely, a third end face E3 and a fourth end face E4 , which face in the axial direction along the rotation axis of the brushless motor 100 and in the direction opposite to the axial direction, respectively, when the core 1 is assembled in the brushless motor 100 .

[0051] like Figure 1 As shown, the third side surface S3 and the fourth side surface S4 are each a surface that connects the end edges of the third end surface E3 and the fourth end surface E4 in the third direction DIR3 to each other. The third side surface S3 is the end surface of the tooth end portion 32 in the third direction DIR3. The fourth side surface S4 is the end surface of the tooth end portion 32 in the opposite direction to the third direction DIR3. Therefore, when the magnetic core 1 is assembled in the brushless motor 100, the third side surface S3 and the fourth side surface S4 are arranged in the third direction DIR3. That is, the tooth end portion 32 has: when the magnetic core 1 is assembled in the brushless motor 100, two side surfaces are arranged in the circumferential direction centered on the rotation axis of the brushless motor 100, namely, the third side surface S3 and the fourth side surface S4. In the present embodiment, the third side surface S3 and the fourth side surface S4 are each a plane.

[0052] like Figure 1As shown, the second inner main surface IS2 and the second outer main surface OS2 are surfaces that connect the end edges of the third end surface E3 and the fourth end surface E4 in the first direction DIR1 to each other. The second inner main surface IS2 is the end surface of the tooth end portion 32 in the first direction DIR1. The second outer main surface OS2 is the end surface of the tooth end portion 32 in the opposite direction to the first direction DIR1. Therefore, when the magnetic core 1 is assembled in the brushless motor 100, the second outer main surface OS2 and the second inner main surface IS2 are arranged in the first direction DIR1. That is, the tooth end portion 32 has: when the magnetic core 1 is assembled in the brushless motor 100, two main surfaces, namely, the second inner main surface IS2 and the second outer main surface OS2, are arranged in the radial direction of the rotation axis of the brushless motor 100. In the present embodiment, the second inner main surface IS2 and the second outer main surface OS2 are each a plane.

[0053] (Structure of the magnetic core 14 with coil)

[0054] Hereinafter, the structure of the magnetic core 14 with coil according to the first embodiment of the present invention will be described with reference to the drawings. Figure 3 It is a perspective view of the magnetic core 14 with a coil. Figure 4 This is a cross-sectional view of the core back 2 and the coil 13 as viewed from the first direction DIR1.

[0055] like Figure 3 As shown, the magnetic core 14 with coil includes the magnetic core 1 and the coil 13 .

[0056] like Figure 3 As shown, the coil 13 is wound around the tooth body 31. The coil 13 is made of a conductive material such as copper. In addition, the coil 13 has a structure in which the surface of the copper wire is covered with an insulating film. By having a structure in which the surface of the copper wire is covered with an insulating film, the coil 13 is electrically insulated from the magnetic core 1. When the coil 13 is assembled in the brushless motor 100, the coil 13 generates a magnetic field by flowing an electric current in the coil 13.

[0057] like Figure 3 As shown, the coil 13 has a first end E131 and a second end E132. The first end E131 and the second end E132 are respectively the two end portions of the coil 13. When the magnetic core 1 is assembled in the brushless motor 100, an electrical signal is supplied to each of the first end E131 and the second end E132 of the coil 13 from a power source (not shown). At this time, the first end E131 and the second end E132 of the coil 13 are respectively fixed to a terminal block (not shown) located, for example, at a position in the opposite direction of the first direction DIR1 relative to the core back 2. As Figure 3 and Figure 4 As shown, the coil 13 passes through the first area A1.

[0058] (Structure of Brushless Motor 100)

[0059] Hereinafter, the structure of the brushless motor 100 according to the first embodiment of the present invention will be described with reference to the drawings. Figure 5 1 is a perspective view of the appearance of a brushless motor 100 using the magnetic core 1 . Figure 6 1 is an exploded perspective schematic diagram of a brushless motor 100 using the magnetic core 1. Figure 6 In the drawings, only representative magnetic cores 1 , coils 13 , and magnetic cores 14 with coils among the plurality of magnetic cores 1 , the plurality of coils 13 , and the plurality of magnetic cores 14 with coils are denoted by reference numerals.

[0060] like Figure 5 and Figure 6 As shown, the brushless motor 100 includes a rotor 20 and a stator assembly 10. Figure 6 As shown, when viewed in the second direction DIR2, the stator assembly 10 is disposed around the rotor 20. That is, the brushless motor 100 is an inner rotor type.

[0061] like Figure 6 As shown, the rotor 20 includes a shaft body 21 and a rotor member 22. The shaft body 21 has a shape extending in the second direction DIR2. In more detail, the shaft body 21 is cylindrical. The rotor member 22 is cylindrical. The central axis of each of the shaft body 21 and the rotor member 22 is the Z axis. That is, the rotation axis of the brushless motor 100 is the Z axis. Therefore, the second direction DIR2 is a direction along the Z axis.

[0062] like Figure 6 As shown, the rotor component 22 includes a soft magnetic body 23 and a hard magnetic body 24. The rotor component 22 is mounted on the outer peripheral surface of the shaft body 21 in the radial direction centered on the Z axis. More specifically, the soft magnetic body 23 is mounted on the outer peripheral surface of the shaft body 21 in the radial direction centered on the Z axis. The hard magnetic body 24 is mounted on the outer peripheral surface of the soft magnetic body 23 in the radial direction centered on the Z axis.

[0063] The soft magnetic body 23 is a soft magnetic body. In addition, the hard magnetic body 24 is a hard magnetic body. The hard magnetic body is magnetized when a magnetic field is applied from the outside. Thereafter, even if the application of the magnetic field is stopped, the hard magnetic body does not lose its magnetization. The material of such a hard magnetic body is a magnet.

[0064] like Figure 6 As shown, the stator assembly 10 includes a bearing 11, a housing 12, and a plurality of cores 14 with coils. Each of the plurality of cores 14 with coils includes a core 1 and a coil 13. That is, the brushless motor 100 includes a core 1.

[0065] The bearing 11 supports the shaft body 21 so that it can rotate around the Z axis. Figure 6As shown, the bearing 11 has a first bearing 11a and a second bearing 11b. The first bearing 11a and the second bearing 11b are each, for example, a ball bearing. The first bearing 11a and the second bearing 11b are each cylindrical. The center axis of each of the first bearing 11a and the second bearing 11b is the Z axis. That is, the center axis of each of the first bearing 11a and the second bearing 11b is consistent with the center axis of the shaft body 21.

[0066] like Figure 6 As shown, the second bearing 11b is located closer to the second direction DIR2 than the first bearing 11a. In addition, the first bearing 11a is located in the opposite direction of the second direction DIR2 than the rotor member 22. The second bearing 11b is located closer to the second direction DIR2 than the rotor member 22. The second bearing 11b supports the end of the shaft body 21 in the second direction DIR2.

[0067] like Figure 5 As shown in FIG. 1 , the housing 12 includes a first housing 12a and a second housing 12b. Figure 5 and Figure 6 As shown, 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 than the second housing 12b. In addition, the first housing 12a has an opening OP. As a result, the end of the shaft body 21 in the opposite direction of the second direction DIR2 protrudes from the opening OP in the opposite direction of the second direction DIR2. That is, the brushless motor 100 is a single-axis type.

[0068] The first housing 12a supports the first bearing 11a, the plurality of 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.

[0069] The number of the magnetic cores 14 with coils is 9. The 9 magnetic cores 14 with coils are arranged in the circumferential direction with the Z axis as the center. The 9 magnetic cores 14 with coils are arranged around the hard magnetic body 24 at intervals.

[0070] The core 1 is magnetized by the magnetic field generated by the hard magnetic body 24 and the magnetic field generated by the coil 13 below. Figure 6 As shown, there is a gap (air gap) between the magnetic core 1 and the rotor component 22 .

[0071] A current is supplied from a power source (not shown) to the coil 13. The rotation of the rotor 20 is controlled by controlling the current.

[0072] [Effect]

[0073] According to the magnetic core 1, it is possible to ensure an area where the two end portions of the coil can be led out. More specifically, it is a shape in which the first end face E1 and the first side face S1 are connected via the first notch face NS1. Therefore, the core back 2 has a shape in which the first end face E1 and the first side face S1 are cut out by the first notch face NS1. Thus, the two end portions of the coil 13 wound on the tooth portion 3 can be led out so as to pass through the area cut out by the first notch face NS1. As a result, according to the magnetic core 1, it is possible to ensure an area where the two end portions of the coil can be led out.

[0074] Furthermore, according to the magnetic core 1, the two end portions of the coil can be led out without increasing the size of the rotating electrical machine. More specifically, the first notch surface NS1 is a surface formed by cutting out the intersection of the first imaginary extended end surface VE1 obtained by extending the first end surface E1 in the third direction DIR3 and the first imaginary extended side surface VS1 obtained by extending the first side surface S1 in the second direction DIR2, with the combination of the first end surface E1 and the first side surface S1 connected by the first notch surface NS1. Thus, the two end portions of the coil 13 can be led out so as to pass through the first area A1, which is the area surrounded by the first imaginary extended end surface VE1, the first imaginary extended side surface VS1 and the first notch surface NS1. Therefore, according to the magnetic core 1, it is not necessary to ensure an area where the two end portions of the coil can be led out in addition to the magnetic core 1. As a result, according to the magnetic core 1, the two end portions of the coil can be led out without increasing the size of the rotating electrical machine.

[0075] In addition, according to the magnetic core 1, it is easy to form a notch surface. In more detail, for example, when the magnetic core is manufactured by stacking electromagnetic steel sheets, after the electromagnetic steel sheets are stacked, cutting processing is required to form the first notch surface NS1. On the other hand, the magnetic core 1 is a molded body formed of soft magnetic powder. Therefore, when manufacturing the magnetic core 1, cutting processing is not required to form the first notch surface NS1. As a result, according to the magnetic core 1, it is easy to form a notch surface.

[0076] Alternatively, in the case of manufacturing the magnetic core by stacking electromagnetic steel sheets, the notch surface can also be formed by pre-adjusting the width of the stacked electromagnetic steel sheets. In this case, the notch surface has a step. In this case, there is a possibility that the insulating film of the coil 13 may be damaged due to the angular contact between the coil 13 and the step of the notch surface. On the other hand, the magnetic core 1 is a formed body formed of soft magnetic powder. Therefore, in the case of manufacturing the magnetic core 1, a notch surface without a step can be formed, and therefore, there is no risk that the insulating film of the coil 13 is damaged by the notch surface.

[0077] [First Modification]

[0078] Hereinafter, a magnetic core 1 a and a magnetic core with coil 14 a according to a first modified example of the present invention will be described respectively with reference to the drawings. Figure 7 It is a perspective view of a magnetic core 1 a according to a first modified example of the present invention. Figure 8 This is a cross-sectional view of the core back 2 and the coil 13 as viewed from the first direction DIR1. In addition, for the magnetic core 1a and the magnetic core with coil 14a involved in the first modification, only the parts different from the magnetic core 1 and the magnetic core with coil 14 involved in the first embodiment are described, and the rest are omitted.

[0079] like Figure 7 and Figure 8 As shown, the shapes of the core 1a and the core 14a with a coil at the core back 2 are different from those of the core 1 and the core 14 with a coil in that the four combinations obtained by selecting 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 and combining them all have the end faces and the side faces connected by the notch faces.

[0080] like Figure 7 and Figure 8 As shown, in this variant, the first end face E1 and the second side face S2 are connected by the second notch face NS2. In addition, the second end face E2 and the first side face S1 are connected by the third notch face NS3. In addition, the second end face E2 and the second side face S2 are connected by the fourth notch face NS4. In addition, in this variant, the first inner main surface IS1 and the first outer main surface OS1 are connected by the first notch face NS1, the second notch face NS2, the third notch face NS3 and the fourth notch face NS4, respectively.

[0081] like Figure 8 As shown, the second notch surface NS2 is a surface formed by cutting off the intersection of the first virtual extended end surface VE1 obtained by extending the first end surface E1 in the opposite direction of the third direction DIR3 and the second virtual extended side surface VS2 obtained by extending the second side surface S2 in the second direction DIR2, taking the combination of the first end surface E1 and the second side surface S2 connected by the second notch surface NS2 as the object. Figure 7 and Figure 8 As shown, the second notch surface NS2 is a plane. Figure 8 As shown, a region surrounded by the first imaginary extended end surface VE1, the second imaginary extended side surface VS2, and the second notch surface NS2 is defined as a second region A2.

[0082] like Figure 8As shown, the third notch surface NS3 is a surface formed by cutting off the intersection of the second imaginary extended end surface VE2 obtained by extending the second end surface E2 in the third direction DIR3 and the first imaginary extended side surface VS1 obtained by extending the first side surface S1 in the opposite direction of the second direction DIR2, taking the combination of the second end surface E2 and the first side surface S1 connected by the third notch surface NS3 as the object. Figure 7 and Figure 8 As shown, the third notch surface NS3 is a plane. Figure 8 As shown, a region surrounded by the second imaginary extended end surface VE2, the first imaginary extended side surface VS1, and the third notch surface NS3 is defined as a third region A3.

[0083] like Figure 8 As shown, the fourth notch surface NS4 is a surface formed by cutting off the intersection of the second virtual extended end surface VE2 obtained by extending the second end surface E2 in the opposite direction of the third direction DIR3 and the second virtual extended side surface VS2 obtained by extending the second side surface S2 in the opposite direction of the second direction DIR2, taking the combination of the second end surface E2 and the second side surface S2 connected by the fourth notch surface NS4 as the object. Figure 7 and Figure 8 As shown, the fourth notch surface NS4 is a plane. Figure 8 As shown, a region surrounded by the second imaginary extended end surface VE2, the second imaginary extended side surface VS2, and the fourth notch surface NS4 is defined as a fourth region A4.

[0084] In this variation, if Figure 8 As shown, the coil 13 passes through each of the first area A1 and the second area A2.

[0085] In the magnetic core 1a as described above, the same effect as that of the magnetic core 1 is achieved. In addition, according to the magnetic core 1a, it is possible to suppress the defect of the core back. More specifically, 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 the notched surface. Therefore, according to the magnetic core 1a, it is possible to suppress the defect of the core back.

[0086] In addition, according to the magnetic core 1a, the degree of freedom of the wiring layout of the coil is improved. More specifically, in a plurality of combinations among 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 the notch face. Therefore, the two end portions of the coil 13 can be led out to pass through at least any one of the first area A1, the second area A2, the third area A3, and the fourth area A4. As a result, according to the magnetic core 1a, the degree of freedom of the wiring layout of the coil is improved.

[0087] [Second Modification]

[0088] Hereinafter, a magnetic core 1 b and a magnetic core with coil 14 b according to a second modified example of the present invention will be described respectively with reference to the drawings. Fig. 9 It is a perspective view of a magnetic core 1b according to a second modified example of the present invention. Fig.10 This is a cross-sectional view of the core back 2 and the coil 13 as viewed from the first direction DIR1. In addition, for the magnetic core 1b and the magnetic core with coil 14b involved in the second modification, only the parts different from the magnetic core 1a and the magnetic core with coil 14a involved in the first modification are described, and the rest are omitted.

[0089] like Fig. 9 and Fig.10 As shown, the core 1b and the core 14b with coil are different from the core 1a and the core 14a with coil in that the area of ​​the first region A1 is larger than the area of ​​the second region A2, the area of ​​the third region A3, and the area of ​​the fourth region A4.

[0090] In this variation, if Fig.10 As shown, the coil 13 passes through the first area A1. On the other hand, the coil 13 does not pass through the second area A2, the third area A3, and the fourth area A4. In other words, the coil 13 passes through the first area A1, which is the largest area among the first area A1, the second area A2, the third area A3, and the fourth area A4.

[0091] In the magnetic core 1b as described above, the same effect as that of the magnetic core 1a is achieved. In addition, according to the magnetic core 1b, it is possible to ensure an area where the two end portions of the coil can be led out, and it is possible to suppress defects in the back of the core. In more detail, the area of ​​the first area A1 is larger than the area of ​​the second area A2, the area of ​​the third area A3, and the area of ​​the fourth area A4. Thus, the coil 13 can pass through the first area A1, which is the area with the largest area. In addition, in a plurality of combinations among 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 the notch surface. Therefore, it is possible to suppress defects in the back of the core 2. As a result, according to the magnetic core 1b, it is possible to ensure an area where the two end portions of the coil can be led out, and it is possible to suppress defects in the back of the core.

[0092] [Third Modification]

[0093] Hereinafter, a magnetic core 1c according to a third modified example of the present invention will be described with reference to the drawings. Fig.11 It is a perspective view of a magnetic core 1c according to a third modified example of the present invention. Fig.12 This is a cross-sectional view of the core back 2 viewed from the first direction DIR1. In addition, regarding the magnetic core 1c according to the third modification, only the portion that is different from the magnetic core 1 according to the first embodiment will be described, and the rest will be omitted.

[0094] like Fig.11 and Fig.12 As shown, the core 1c is different from the 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 a single plane. Fig.11 and Fig.12 As shown, it is sufficient to include a plane.

[0095] The magnetic core 1 c described above also exhibits the same effects as those of the magnetic core 1 .

[0096] [Fourth Modification]

[0097] Hereinafter, a magnetic core 1d according to a fourth modified example of the present invention will be described with reference to the drawings. Fig.13 It is a perspective view of a magnetic core 1d according to a fourth modified example of the present invention. Fig.14 This is a cross-sectional view of the core back 2 viewed from the first direction DIR1. In addition, regarding the magnetic core 1d according to the fourth modification, only the portion that is different from the magnetic core 1 according to the first embodiment will be described, and the remaining portion will be omitted.

[0098] like Fig.13 and Fig.14As shown, the magnetic core 1d is different from the magnetic core 1 in that the first notch surface NS1 is a convex surface. That is, the first notch surface NS1 is not limited to a flat surface, but can also be a curved surface. In this modified example, when viewed from the first direction DIR1, the first notch surface NS1 is a convex surface that is protrudingly curved from the center of the core back 2 toward the first imaginary extended end surface VE1 and the first imaginary extended side surface VS1 to form an intersection.

[0099] The magnetic core 1d described above also exhibits the same effects as those of the magnetic core 1. Furthermore, according to the magnetic core 1d, it is possible to further suppress the chipping of the core back.

[0100] [Fifth Modification]

[0101] Hereinafter, a magnetic core 1 e according to a fifth modified example of the present invention will be described with reference to the drawings. Fig.15 It is a perspective view of a magnetic core 1e according to a fifth modified example of the present invention. Fig.16 This is a cross-sectional view of the core back 2 viewed from the first direction DIR1. In addition, regarding the magnetic core 1e according to the fifth modification, only the portion that is different from the magnetic core 1 according to the first embodiment will be described, and the remaining portion will be omitted.

[0102] like Fig.15 and Fig.16 As shown, the core 1e is different from the core 1 in the shape of the first notch surface NS1. The first notch surface NS1 is not limited to a single curved surface, but may include a curved surface. Furthermore, the first notch surface NS1 is not limited to a single convex surface, but may include a convex surface.

[0103] The magnetic core 1 e described above also has the same effects as those of the magnetic core 1 .

[0104] [Second embodiment]

[0105] Hereinafter, a magnetic core 1f and a magnetic core 14f with a coil according to a second embodiment of the present invention will be described respectively with reference to the drawings. Fig.17 It is a perspective view of a magnetic core 1f according to a second embodiment of the present invention. Fig.18 This is a cross-sectional view of the tooth tip portion 32 as viewed in the first direction DIR1. Fig.19 It is a perspective view of the magnetic core 14f with a coil. Fig. 20 It is a cross-sectional view of the tooth end portion 32 and the coil 13 observed in the first direction DIR1. In addition, for the magnetic core 1f and the magnetic core with coil 14f involved in the second embodiment, only the parts different from the magnetic core 1 and the magnetic core with coil 14 involved in the first embodiment are described, and the rest will be omitted.

[0106] like Figures 17 to 20As shown in FIG. 1 , the core 1f is different from the core 1 in that the first notch surface NS1 is formed in the tooth end portion 32 . In the present embodiment, the first notch surface NS1 is not formed in the core back 2 .

[0107] The shape of the tooth end portion 32 is a shape in which the end face and the side face are connected via a notch face in at least any one of the four combinations, taking into account four combinations obtained by selecting one of the three end faces E3 and the four end faces E4 as two end faces and the three side faces S3 and the four side faces S4 as two side faces. Specifically, the four combinations considered are a combination of the third end face E3 and the third side face S3, a combination of the third end face E3 and the fourth side face S4, a combination of the fourth end face E4 and the third side face S3, and a combination of the fourth end face E4 and the fourth side face S4. In this embodiment, as Fig.17 and Fig.18 As shown, the third end surface E3 and the third side surface S3 are connected via the first notch surface NS1. In the present embodiment, the second inner main surface IS2 and the second outer main surface OS2 are connected via the first notch surface NS1.

[0108] In this variation, if Fig.18 As shown, the first notch surface NS1 is a surface formed by cutting off the intersecting portion of the third imaginary extended end surface VE3 obtained by extending the third end surface E3 in the third direction DIR3 and the third imaginary extended side surface VS3 obtained by extending the third side surface S3 in the second direction DIR2, taking the combination of the third end surface E3 and the third side surface S3 connected by the first notch surface NS1 as the object. In addition, the third imaginary extended end surface VE3 only needs to be a surface obtained by extending the third end surface E3 in the circumferential direction with the rotation axis of the brushless motor 100 as the center when the magnetic core 1f is assembled in the brushless motor 100. In addition, the third imaginary extended side surface VS3 only needs to be a surface obtained by extending 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 in the brushless motor 100. In this embodiment, as Fig.17 and Fig.18 As shown in FIG. 1 , the first notch surface NS1 is a plane. Fig.18 As shown, a region surrounded by the third imaginary extended end surface VE3, the third imaginary extended side surface VS3, and the first notch surface NS1 is defined as a fifth region A5.

[0109] The first end E131 and the second end E132 of the coil 13 are each fixed to a terminal block (not shown) located closer to the first direction DIR1 than the tooth end portion 32, for example. Fig.19 and Fig. 20 As shown, the coil 13 passes through the fifth area A5.

[0110] In the magnetic core 1f as described above, the same effect as that of the magnetic core 1 is achieved. More specifically, the third end face E3 and the third side face S3 are connected via the first notch face NS1. Therefore, the tooth end portion 32 has a shape in which the third end face E3 and the third side face S3 are cut off by the first notch face NS1. As a result, the two end portions of the coil 13 wound on the tooth portion 3 can be led out so as to pass through the area cut off by the first notch face NS1. As a result, according to the magnetic core 1f, the area where the two end portions of the coil can be led out can be ensured.

[0111] In addition, according to the magnetic core 1f, the two end portions of the coil can be led out without increasing the size of the rotating electrical machine. More specifically, the first notch surface NS1 is a surface formed by cutting out the intersection of the third imaginary extended end surface VE3 obtained by extending the third end surface E3 in the third direction DIR3 and the third imaginary extended side surface VS3 obtained by extending the third side surface S3 in the second direction DIR2, with the combination of the third end surface E3 and the third side surface S3 connected by the first notch surface NS1. Thus, the two end portions of the coil 13 can be led out so as to pass through the fifth area A5, which is the area surrounded by the third imaginary extended end surface VE3, the third imaginary extended side surface VS3 and the first notch surface NS1. Therefore, according to the magnetic core 1f, it is not necessary to ensure an area where the two end portions of the coil can be led out independently of the magnetic core 1f. As a result, according to the magnetic core 1f, the two end portions of the coil can be led out without increasing the size of the rotating electrical machine.

[0112] [Sixth Modification]

[0113] Hereinafter, a magnetic core 1g and a magnetic core with coil 14g according to a sixth modified example of the present invention will be described respectively with reference to the drawings. Fig.21 It is a perspective view of a magnetic core 1g according to a sixth modified example of the present invention. Fig. 22 It is a cross-sectional view of the tooth end portion 32 and the coil 13 observed in the first direction DIR1. In addition, for the magnetic core 1g and the magnetic core with coil 14g involved in the sixth modification, only the parts different from the magnetic core 1f and the magnetic core with coil 14f involved in the second embodiment are described, and the rest are omitted.

[0114] like Fig.21 and Fig. 22 As shown, the magnetic core 1g and the magnetic core 14g with a coil are different from the magnetic core 1f and the magnetic core 14f with a coil in that the shape of the tooth end portion 32 is a shape in which all end faces and side faces are connected by notch faces in four combinations obtained by selecting one from each of the third end face E3 and the fourth end face E4 and the third side face S3 and the fourth side face S4 and combining them.

[0115] In this variation, if Fig.21 and Fig. 22 As shown, the third end face E3 and the fourth side face S4 are connected by the second notch face NS2. In addition, the fourth end face E4 and the third side face S3 are connected by the third notch face NS3. In addition, the fourth end face E4 and the fourth side face S4 are connected by the fourth notch face NS4. In addition, in this variant, the second inner main surface IS2 and the second outer main surface OS2 are connected by the first notch face NS1, the second notch face NS2, the third notch face NS3 and the fourth notch face NS4, respectively.

[0116] In this variation, if Fig. 22 As shown, the second notch surface NS2 is a surface formed by cutting off the intersecting portion of the third virtual extended end surface VE3 obtained by extending the third end surface E3 in the opposite direction of the third direction DIR3 and the fourth virtual extended side surface VS4 obtained by extending the fourth side surface S4 in the second direction DIR2, taking the combination of the third end surface E3 and the fourth side surface S4 connected by the second notch surface NS2 as the object. Fig.21 and Fig. 22 As shown, the second notch surface NS2 is a plane. Fig. 22 As shown, the area surrounded by the third imaginary extended end surface VE3, the fourth imaginary extended side surface VS4 and the second notch surface NS2 is defined as the sixth area A6.

[0117] In this variation, if Fig. 22 As shown, the third notch surface NS3 is a surface formed by cutting off the intersection of the fourth virtual extended end surface VE4 obtained by extending the fourth end surface E4 in the third direction DIR3 and the third virtual extended side surface VS3 obtained by extending the third side surface S3 in the opposite direction of the second direction DIR2. Fig.21 and Fig. 22 As shown, the third notch surface NS3 is a plane. Fig. 22 As shown, the area surrounded by the fourth imaginary extended end surface VE4, the third imaginary extended side surface VS3 and the third notch surface NS3 is defined as the seventh area A7.

[0118] In this variation, if Fig. 22 As shown, the fourth notch surface NS4 is a surface formed by cutting off the intersection of the fourth virtual extended end surface VE4 obtained by extending the fourth end surface E4 in the opposite direction of the third direction DIR3 and the fourth virtual extended side surface VS4 obtained by extending the fourth side surface S4 in the opposite direction of the second direction DIR2. Fig.21 and Fig. 22 As shown, the fourth notch surface NS4 is a plane. Fig. 22 As shown, the area surrounded by the 4th imaginary extended end surface VE4, the 4th imaginary extended side surface VS4 and the 4th notch surface NS4 is defined as the 8th area A8.

[0119] In this variation, if Fig. 22 As shown, the coil 13 passes through the fifth area A5 and the sixth area A6 respectively.

[0120] In the magnetic core 1g as described above, the same effect as that of the magnetic core 1f is achieved. In addition, according to the magnetic core 1g, it is possible to suppress the defect of the tooth end portion. More specifically, in all of the four combinations obtained by selecting one from each of the third end face E3 and the fourth end face E4 and the third side face S3 and the fourth side face S4 and combining them, the end face and the side face are connected by the notch surface. Therefore, according to the magnetic core 1g, it is possible to suppress the defect of the tooth end portion.

[0121] In addition, according to the magnetic core 1g, the degree of freedom of the wiring layout of the coil is improved. More specifically, in a plurality of combinations among the four combinations obtained by selecting and combining one from each of 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 the notch face. Therefore, the two end portions of the coil 13 can be led out so as to pass through at least any one of the fifth area A5, the sixth area A6, the seventh area A7, and the eighth area A8. As a result, according to the magnetic core 1g, the degree of freedom of the wiring layout of the coil is improved.

[0122] [Seventh Modification]

[0123] Hereinafter, a magnetic core 1h and a magnetic core with coil 14h according to a seventh modification of the present invention will be described respectively with reference to the drawings. Fig.23 It is a perspective view of a magnetic core 1h according to a seventh modification of the present invention. Fig.24 It is a cross-sectional view of the tooth end portion 32 and the coil 13 observed in the first direction DIR1. In addition, for the magnetic core 1h and the magnetic core with coil 14h involved in the seventh modification, only the parts that are different from the magnetic core 1f and the magnetic core with coil 14f involved in the second embodiment are described, and the rest are omitted.

[0124] like Fig.23 and Fig.24 As shown, the core 1h and the core 14h with coil are different from the core 1f and the core 14f with coil in that the area of ​​the 5th region A5 is larger than the area of ​​the 6th region A6, the area of ​​the 7th region A7 and the area of ​​the 8th region A8.

[0125] In this variation, if Fig.24 As shown, the coil 13 passes through the fifth area A5. On the other hand, the coil 13 does not pass through the sixth area A6, the seventh area A7, and the eighth area A8. In other words, the coil 13 passes through the fifth area A5, which is the largest area among the fifth area A5, the sixth area A6, the seventh area A7, and the eighth area A8.

[0126] In the magnetic core 1h as described above, the same effect as that of the magnetic core 1f is achieved. In addition, according to the magnetic core 1h, it is possible to ensure the area where the two end portions of the coil can be led out, and it is possible to suppress the defect of the tooth end portion. In more detail, the area of ​​the 5th area A5 is larger than the area of ​​the 6th area A6, the area of ​​the 7th area A7, and the area of ​​the 8th area A8. As a result, the coil 13 can pass through the 5th area A5, which is the area with the largest area. In addition, in a plurality of combinations among the four combinations obtained by selecting one from each of the 3rd end face E3 and the 4th end face E4 and the 3rd side face S3 and the 4th side face S4 and combining them, the end face and the side face are connected by the notched surface. Therefore, it is possible to suppress the defect of the tooth end portion 32. As a result, according to the magnetic core 1h, it is possible to ensure the area where the two end portions of the coil can be led out, and it is possible to suppress the defect of the tooth end portion.

[0127] [Eighth Modification]

[0128] Hereinafter, a magnetic core 1i according to an eighth modification of the present invention will be described with reference to the drawings. Fig.25 It is a perspective view of a magnetic core 1i according to an eighth modified example of the present invention. Fig.26 It is a cross-sectional view of the tooth tip portion 32 viewed in the first direction DIR1. In addition, regarding the core 1i according to the eighth modification, only the portion that is different from the core 1f according to the second embodiment will be described, and the rest will be omitted.

[0129] like Fig.25 and Fig.26 As shown, the difference between the magnetic core 1i and the magnetic core 1 is that the first notch surface NS1 is L-shaped when viewed in the first direction DIR1. The first notch surface NS1 is not limited to being a plane. Fig.25 and Fig.26 As shown, it is sufficient to include a plane.

[0130] The magnetic core 1i described above also exhibits the same effects as those of the magnetic core 1f.

[0131] [9th Modification]

[0132] Hereinafter, a magnetic core 1j according to a ninth modified example of the present invention will be described with reference to the drawings. Fig. 27 It is a perspective view of a magnetic core 1j according to a ninth modified example of the present invention. Fig.28It is a cross-sectional view of the tooth tip portion 32 viewed in the first direction DIR1. In addition, only the parts of the core 1j according to the ninth modification example that are different from the core 1f according to the second embodiment will be described, and the rest will be omitted.

[0133] like Fig. 27 and Fig.28 As shown, the magnetic core 1j is different from the magnetic core 1f in that the first notch surface NS1 is a convex surface. That is, the first notch surface NS1 is not limited to a flat surface, but may be a curved surface. In this modified example, when viewed in the first direction DIR1, the first notch surface NS1 is a convex surface that curves protrudingly from the center of the tooth end portion 32 toward the portion where the third imaginary extended end surface VE3 intersects with the third imaginary extended side surface VS3.

[0134] The magnetic core 1j described above also has the same effects as the magnetic core 1f. In addition, according to the magnetic core 1j, it is possible to further suppress the chipping of the tooth tip portion.

[0135] [10th Modification]

[0136] Hereinafter, a magnetic core 1k according to a tenth modified example of the present invention will be described with reference to the drawings. Fig.29 It is a perspective view of a magnetic core 1k according to a tenth modified example of the present invention. Fig.30 It is a cross-sectional view of the tooth tip portion 32 viewed in the first direction DIR1. In addition, regarding the core 1k according to the tenth modification, only the portion that is different from the core 1f according to the second embodiment will be described, and the rest will be omitted.

[0137] like Fig.29 and Fig.30 As shown, the core 1k is different from the core 1f in the shape of the first notch surface NS1. The first notch surface NS1 is not limited to a curved surface, as long as it includes a curved surface. In addition, the first notch surface NS1 is not limited to a convex surface, as long as it includes a convex surface.

[0138] The magnetic core 1k described above also exhibits the same effects as those of the magnetic core 1f.

[0139] [Other embodiments]

[0140] The magnetic core according to the present invention is not limited to the magnetic cores 1 and 1a to 1k, and can be modified within the scope of the gist thereof. In addition, the structures of the magnetic cores 1 and 1a to 1k can be arbitrarily combined.

[0141] The core with coil according to the present invention is not limited to the cores with coil 14, 14a to 14k including the cores 1, 1a to 1k and the coil 13, and can be modified within the scope of the gist thereof. In addition, the structures of the cores with coil 14, 14a to 14k can be arbitrarily combined.

[0142] In addition, the rotating electrical machine only needs to have a structure that rotates the rotor by electricity or a structure that generates electricity by the rotation of the rotor. The rotating electrical machine includes a brushless motor, a permanent magnet synchronous motor, a permanent magnet synchronous generator, etc. In this case, the rotating electrical machine only needs to have at least any one of the magnetic cores 1, 1a to 1k, and may also have a brush.

[0143] Furthermore, when the core 1 is assembled in the brushless motor 100 , the first direction DIR1 may not be directed in the opposite direction to the radial direction centered on the rotation axis of the brushless motor 100 .

[0144] In addition, the first end face E1, the second end face E2, the third end face E3, and the fourth end face E4 may not be planes. In addition, the first side face S1, the second side face S2, the third side face S3, and the fourth side face S4 may not be planes. In addition, the first inner principal surface IS1, the first outer principal surface OS1, the second inner principal surface IS2, and the second outer principal surface OS2 may not be planes.

[0145] In addition, the first inner principal surface IS1 and the first outer principal surface OS1 may not be connected by the first notch surface NS1. In addition, the first inner principal surface IS1 and the first outer principal surface OS1 may not be connected by the second notch surface NS2. In addition, the first inner principal surface IS1 and the first outer principal surface OS1 may not be connected by the third notch surface NS3. In addition, the first inner principal surface IS1 and the first outer principal surface OS1 may not be connected by the fourth notch surface NS4.

[0146] In addition, the brushless motor 100 may be an outer rotor type.

[0147] In addition, the brushless motor 100 is not limited to a single-shaft type, and the brushless motor 100 may be a dual-shaft type, for example.

[0148] In addition, each of the first bearing 11 a and the second bearing 11 b is not limited to a ball bearing.

[0149] In addition, the material of each of the first housing 12a and the second housing 12b may be a material having high rigidity.

[0150] In addition, the number of the magnetic cores 14 with coils is not limited to nine.

[0151] In addition, in each of the magnetic core 1 and the magnetic core with coil 14 , at least any 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 2 instead of the first notch surface NS1 .

[0152] In the magnetic core 14a with coil, the coil 13 does not necessarily need to pass through each of the first area A1 and the second area A2. In the magnetic core 14a with coil, the coil 13 only needs to pass through at least any one of the first area A1, the second area A2, the third area A3, and the fourth area A4.

[0153] In addition, in each of the magnetic core 1b and the magnetic core with coil 14b, the area of ​​the first region A1 is not larger than the area of ​​the second region A2, the area of ​​the third region A3, and the area of ​​the fourth region A4. In more detail, it is not necessary to connect the end face and the side face by the notch face in all of the 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), as long as the end face and the side face are connected by the notch face in multiple combinations among the four combinations. In addition, it is not necessary to make the area of ​​the first region A1 larger than the area of ​​the second region A2, the area of ​​the third region A3, and the area of ​​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 area A2 which is the largest area.

[0154] In addition, in the magnetic core 1c, when viewed from the first direction DIR1, the first notch surface NS1 may not be L-shaped.

[0155] Furthermore, in the magnetic core 1d, when viewed from the first direction DIR1, the first notch surface NS1 may not be a convex surface that curves protrudingly from the center of the core back 2 toward the intersection of the first imaginary extended end surface VE1 and the first imaginary extended side surface VS1.

[0156] In addition, the second inner main surface IS2 and the second outer main surface OS2 may not be connected via the first notch surface NS1. In addition, the second inner main surface IS2 and the second outer main surface OS2 may not be connected via the second notch surface NS2. In addition, the second inner main surface IS2 and the second outer main surface OS2 may not be connected via the third notch surface NS3. In addition, the second inner main surface IS2 and the second outer main surface OS2 may not be connected via the fourth notch surface NS4.

[0157] In addition, in each of the magnetic core 1f and the magnetic core with coil 14f, at least any 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 at the tooth tip portion 32 instead of the first notch surface NS1.

[0158] In the magnetic core 14g with coil, the coil 13 does not necessarily need to pass through each of the fifth area A5 and the sixth area A6. In the magnetic core 14g with coil, the coil 13 only needs to pass through at least any one of the fifth area A5, the sixth area A6, the seventh area A7, and the eighth area A8.

[0159] In addition, in each of the magnetic core 1h and the magnetic core with coil 14h, the area of ​​the fifth region A5 is not larger than the area of ​​the sixth region A6, the area of ​​the seventh region A7, and the area of ​​the eighth region A8. In more detail, it is not necessary to connect the end face and the side face by the notch face 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). It is sufficient to connect the end face and the side face by the notch face in multiple combinations among the four combinations. In addition, it is not necessary to make the area of ​​the fifth region A5 larger than the area of ​​the sixth region A6, the area of ​​the seventh region A7, and the area of ​​the eighth region A8. For example, the area of ​​the sixth region A6 may be larger than the area of ​​the fifth region A5, the area of ​​the seventh region A7, and the area of ​​the eighth region A8. In this case, the coil 13 passes through the sixth area A6 which is the largest area.

[0160] In addition, in the magnetic core 1i, the first notch surface NS1 may not be L-shaped when viewed in the first direction DIR1.

[0161] Furthermore, in the core 1 j , when viewed in the first direction DIR1 , the first notch surface NS1 may not be a convex surface that curves protrudingly 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 .

[0162] In addition, 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 both the core back 2 and the tooth tip portion 32 .

[0163] Alternatively, the magnetic cores 1 and 1 a to 1 k may be produced by laminating electromagnetic steel sheets.

[0164] The present invention has the following structure.

[0165] (1) A magnetic core comprising a core back and a tooth portion, and used in a rotating electrical machine, wherein the core back has: two end faces which face in an axial direction and in a direction opposite to the axial direction along a rotation axis of the rotating electrical machine, respectively, when the core is assembled in the rotating electrical machine; and two side faces which are arranged in a circumferential direction around the rotation axis when the core is assembled in the rotating electrical machine, wherein the core back has a shape in which, in at least any one of four combinations obtained by selecting one of the two end faces and the two side faces and combining them, the end faces and the side faces are connected via a notch face.

[0166] (2) In the magnetic core described in (1), the above-mentioned notch surface is a surface formed by cutting off the intersecting portion of the above-mentioned end face and the above-mentioned side face connected by the notch surface and the imaginary extended end face obtained by extending the end face in the above-mentioned circumferential direction and the imaginary extended side face obtained by extending the side face in the above-mentioned axial direction.

[0167] (3) In the magnetic core described in (2), in all of the above four combinations, the end surface and the side surface are connected by the notch surface.

[0168] (4) In the magnetic core described in (2) or (3), in multiple combinations among the above-mentioned four combinations, the above-mentioned end face and the above-mentioned side face are connected by the above-mentioned notch face, and with respect to the area of ​​the region enclosed by the above-mentioned imaginary extended end face, the above-mentioned imaginary extended side face and the above-mentioned notch face, in one combination among the above-mentioned multiple combinations, the area is larger than the area in other combinations.

[0169] (5) In the magnetic core described in any one of (1) to (4), the notch surface includes a flat surface.

[0170] (6) In the magnetic core described in any one of (1) to (5), the notch surface includes a convex surface.

[0171] (7) A magnetic core with a coil, comprising: the magnetic core described in (2) or (3); and a coil, wherein the coil is wound on the above-mentioned tooth portion, and the coil passes through an area surrounded by the above-mentioned imaginary extended end face, the above-mentioned imaginary extended side face and the above-mentioned notch face.

[0172] (8) A magnetic core with a coil, comprising: the magnetic core described in (4); and a coil, wherein the coil is wound around the tooth portion, and the coil passes through the region having the largest area.

[0173] (9) A magnetic core having a core back and a tooth portion, and used in a rotating electrical machine, wherein the tooth portion in the magnetic core includes: a tooth body portion, which, when the magnetic core is assembled in the rotating electrical machine, extends from the core back toward the rotor of the rotating electrical machine; and a tooth tip portion, which is formed at the tip of the tooth body portion, the tooth tip portion having: two end faces facing in an axial direction and in a direction opposite to the axial direction along the rotation axis of the rotating electrical machine when the magnetic core is assembled in the rotating electrical machine; and two side faces arranged in a circumferential direction around the rotation axis when the magnetic core is assembled in the rotating electrical machine, the tooth tip portion having a shape in which, in at least any one of four combinations obtained by selecting and combining the two end faces and the two side faces, the end faces are connected to the side faces via a notch face.

[0174] (10) In the magnetic core described in (9), the above-mentioned notch surface is a surface formed by cutting off the intersecting portion of the above-mentioned end face and the above-mentioned side face connected by the notch surface and the imaginary extended end face obtained by extending the end face in the above-mentioned circumferential direction and the imaginary extended side face obtained by extending the side face in the above-mentioned axial direction.

[0175] (11) In the magnetic core described in (10), in all of the above four combinations, the end surface and the side surface are connected by the notch surface.

[0176] (12) In the magnetic core described in (10) or (11), in multiple combinations among the above-mentioned four combinations, the above-mentioned end face and the above-mentioned side face are connected by the above-mentioned notch face, and with respect to the area of ​​the region enclosed by the above-mentioned imaginary extended end face, the above-mentioned imaginary extended side face and the above-mentioned notch face, the area of ​​one combination among the above-mentioned multiple combinations is larger than the area of ​​other combinations.

[0177] (13) In the magnetic core described in any one of (9) to (12), the notch surface includes a flat surface.

[0178] (14) In the magnetic core described in any one of (9) to (13), the notch surface includes a convex surface.

[0179] (15) A magnetic core with a coil, comprising: the magnetic core described in (10) or (11); and a coil, wherein the coil is wound on the above-mentioned tooth body portion, and the above-mentioned coil passes through the area surrounded by the above-mentioned imaginary extended end face, the above-mentioned imaginary extended side face and the above-mentioned notch face.

[0180] (16) A magnetic core with a coil, comprising: the magnetic core described in (12); and a coil, wherein the coil is wound around the tooth body portion, and the coil passes through the region having the largest area.

[0181] (17) In the magnetic core described in any one of (1) to (6) or any one of (9) to (14), the core is a molded body formed of soft magnetic powder.

[0182] (18) A rotating electrical machine comprising the core described in any one of (1) to (6), any one of (9) to (14), or (17).

[0183] Description of Reference Numerals

[0184] 1, 1a, 1b, 1c, 1d, 1e, 1f, 1g, 1h, 1i, 1j, 1k... magnetic core; 2... back of the core; 3... teeth; 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, 14 k...core with coil; 15...stator; 20...rotor; 21...shaft; 22...rotor member; 23...soft magnetic body; 24...hard magnetic body; 31...tooth body; 32...tooth tip; 100...brushless motor; A1...1st area; A2...2nd area; A3...3rd area; A4...4th area; A5...5th area; A6...6th area; A7...7th area; A8...8th area; DIR 1...1st direction; DIR2...2nd direction; DIR3...3rd direction; E131...1st end; E132...2nd end; E1...1st end surface; E2...2nd end surface; E3...3rd end surface; E4...4th end surface; IS1...1st inner main surface; IS2...2nd inner main surface; NS1...1st notch surface; NS2...2nd notch surface; NS3...3rd notch surface; NS4...4th notch surface; OP...opening; OS1. ..the first outer main surface; OS2...the second outer main surface; S1...the first side surface; S2...the second side surface; S3...the third side surface; S4...the fourth side surface; VE1...the first imaginary extended end surface; VE2...the second imaginary extended end surface; VE3...the third imaginary extended end surface; VE4...the fourth imaginary extended end surface; VS1...the first imaginary extended side surface; VS2...the second imaginary extended side surface; VS3...the third imaginary extended side surface; VS4...the fourth imaginary extended side surface.

Claims

1. A magnetic core having a core back and a tooth portion and used for a rotating electrical machine, The magnetic core is characterized in that The core back has: two end surfaces facing in an axial direction and in a direction opposite to the axial direction along a rotation axis of the rotating electrical machine, respectively, when the magnetic core is assembled in the rotating electrical machine; and When the magnetic core is assembled in the rotating electrical machine, two side surfaces are arranged in a circumferential direction around the rotation axis. The shape of the core back is a shape in which the end face and the side face are connected via a notch face in at least any one of four combinations obtained by selecting one from each of the two end faces and the two side faces and combining them.

2. The magnetic core according to claim 1, characterized in that The notch surface is formed by cutting off the intersecting portion of the imaginary extended end surface obtained by extending the end surface in the circumferential direction and the imaginary extended side surface obtained by extending the side surface in the axial direction, taking the combination of the end surface and the side surface connected by the notch surface as the object.

3. The magnetic core according to claim 2, characterized in that: In all of the four combinations, the end surface and the side surface are connected by the notch surface.

4. The magnetic core according to claim 2 or 3, characterized in that: In a plurality of the four combinations, the end face and the side face are connected by the notch face, Regarding the area of ​​a region surrounded by the imaginary extended end surface, the imaginary extended side surface, and the notch surface, in one of the plurality of combinations, the area is made larger than that in the other combinations.

5. The magnetic core according to any one of claims 1 to 4, characterized in that: The notch surface comprises a plane.

6. The magnetic core according to any one of claims 1 to 5, characterized in that: The notched surface comprises a convex surface.

7. A magnetic core with a coil, characterized in that: have: The magnetic core according to claim 2 or 3; and Coil, The coil is wound around the tooth portion. The coil passes through a region surrounded by the imaginary extended end surface, the imaginary extended side surface, and the notch surface.

8. A magnetic core with a coil, characterized in that: have: The magnetic core according to claim 4; and Coil, The coil is wound around the tooth portion. The coil passes through the region with the largest area.

9. A magnetic core having a core back and a tooth portion and used for a rotating electrical machine, The magnetic core is characterized in that The tooth portion comprises: a tooth body portion which, when the magnetic core is assembled in the rotating electrical machine, extends from the core back toward the rotor of the rotating electrical machine; and a tooth terminal portion formed at a terminal end of the tooth main body portion, The tooth end portion has: two end surfaces facing the axial direction along the rotation axis of the rotating electrical machine and the direction opposite to the axial direction respectively when the magnetic core is assembled in the rotating electrical machine; as well as When the magnetic core is assembled in the rotating electrical machine, two side surfaces are arranged in a circumferential direction around the rotation axis. The shape of the tooth tip portion is a shape in which the end face and the side face are connected via a notch face in at least any one of four combinations obtained by selecting one from each of the two end faces and the two side faces and combining them.

10. The magnetic core according to claim 9, characterized in that The notch surface is formed by cutting off the intersecting portion of the imaginary extended end surface obtained by extending the end surface in the circumferential direction and the imaginary extended side surface obtained by extending the side surface in the axial direction, taking the combination of the end surface and the side surface connected by the notch surface as the object.

11. The magnetic core according to claim 10, characterized in that: In all of the four combinations, the end surface and the side surface are connected by the notch surface.

12. The magnetic core according to claim 10 or 11, characterized in that: In a plurality of the four combinations, the end face and the side face are connected by the notch face, Regarding the area of ​​a region surrounded by the imaginary extended end surface, the imaginary extended side surface, and the notch surface, in one of the plurality of combinations, the area is made larger than that in the other combinations.

13. The magnetic core according to any one of claims 9 to 12, characterized in that: The notch surface comprises a plane.

14. The magnetic core according to any one of claims 9 to 13, characterized in that: The notched surface comprises a convex surface.

15. A magnetic core with a coil, characterized in that: have: The magnetic core according to claim 10 or 11; and Coil, The coil is wound around the tooth body. The coil passes through a region surrounded by the imaginary extended end surface, the imaginary extended side surface, and the notch surface.

16. A magnetic core with a coil, characterized in that: have: The magnetic core according to claim 12; and Coil, The coil is wound around the tooth body. The coil passes through the region with the largest area.

17. The magnetic core according to any one of claims 1 to 6 or any one of claims 9 to 14, characterized in that: It is a molded body formed from soft magnetic powder.

18. A rotating electrical machine, characterized in that: A magnetic core according to any one of claims 1 to 6, any one of claims 9 to 14, or claim 17.

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