Magnetic cores, stator assemblies, rotating electromachines, and brushless motors

Abstract

This magnetic material core, which is used in a rotary electric machine, comprises: a core back portion; and teeth portions that include teeth body portions extending in a first direction from the core back portion, and teeth tip portions provided to the tips of the teeth body portions in the first direction. When the magnetic material core is incorporated into a rotary electric machine, the position of the geometric center of the teeth portions in a second direction that follows a rotary shaft of the rotary electric machine is equal to the position of the geometric center of the core back portion. The position of a first line at the tips of the teeth body portions and the position of the first line at the ends of the teeth body portions on the opposite side from the tips are offset in the second direction, where the first line is a line that connects the geometric centers of cross-sections of the teeth body portions perpendicular to a third direction, and the third direction is an orthogonal projection of the first direction onto a plane that is orthogonal to the second direction.

Description

Technical Field

[0001] The present invention relates to a magnetic core used in a rotating electrical machine, a stator assembly including the magnetic core, a rotating electrical machine including the magnetic core, and a brushless motor including the magnetic core.

Background Art

[0002] As an invention related to a conventional magnetic core, for example, the magnetic core described in Patent Document 1 is known. The magnetic core described in Patent Document 1 includes teeth extending from the inner peripheral surface of a cylindrical yoke extending in the direction along the rotation axis toward the opposite direction of the radial direction of the yoke, or teeth extending from the outer peripheral surface of a cylindrical yoke extending in the direction along the rotation axis toward the radial direction of the yoke. Here, the rotation axis is the rotation axis of the rotating electrical machine when the magnetic core is incorporated into the rotating electrical machine. The teeth have a teeth main body portion around which a coil is wound, and a teeth tip portion protruding in the direction along the rotation axis and the circumferential direction of the yoke with respect to the teeth main body portion.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] By the way, in the magnetic core described in Patent Document 1, there is a desire to miniaturize the rotating electrical machine.

[0005] Therefore, an object of the present invention is to provide a magnetic core, a stator assembly, a rotating electrical machine, and a brushless motor capable of miniaturizing the rotating electrical machine.

Means for Solving the Problems

[0006] A magnetic core according to one embodiment of the present invention is A magnetic core used in rotating electrical machinery, Core back section, A tooth portion including a tooth body portion extending in a first direction from the core back portion, and a tooth tip portion provided at the tip of the tooth body portion in the first direction, It is equipped with, With respect to a second direction that is aligned with the rotation axis of the rotating electric machine when the magnetic core is incorporated into the rotating electric machine, the position of the geometric center of the teeth portion is equal to the position of the geometric center of the core back portion. The orthogonal projection of the first direction onto a plane perpendicular to the second direction is defined as the third direction. The line connecting the geometric centers of the cross-sections of the tooth body portion perpendicular to the third direction is defined as the first line. The position of the first line at the tip of the tooth body and the position of the first line at the end of the tooth body opposite to the tip are offset in the second direction. [Effects of the Invention]

[0007] According to the present invention, it is possible to provide a magnetic core, stator assembly, rotating electric machine, and brushless motor that can be miniaturized. [Brief explanation of the drawing]

[0008] [Figure 1] Figure 1 is a perspective view of the magnetic core 1. [Figure 2] Figure 2 is a cross-sectional view of the magnetic core 1 as seen in the fourth direction, DIR4. [Figure 3] Figure 3 is an external perspective view of the brushless motor 100 in which the magnetic core 1 is used. [Figure 4] Figure 4 is an exploded perspective schematic of a brushless motor 100 using a magnetic core 1. [Figure 5] Figure 5 is a cross-sectional view of the magnetic core 6 according to the comparative example, viewed in the fourth direction DIR4. [Figure 6]Figure 6 is a cross-sectional view of the magnetic core 6 and connecting member 15 in a comparative example, on which the coil 13 is wound, as seen in the fourth direction DIR4. [Figure 7] Figure 7 is a cross-sectional view of the magnetic core 1 around which the coil 13 is wound and the connecting member 15, viewed in the fourth direction DIR4. [Figure 8] Figure 8 is a perspective view of the magnetic core 1a. [Figure 9] Figure 9 is a cross-sectional view of the magnetic core 1a as seen in the fourth direction, DIR4. [Figure 10] Figure 10 is an example of a cross-sectional view of the magnetic core 1 around which the coil 13 is wound, the connecting member 15, and the wiring member 16, viewed in the fourth direction DIR4. [Modes for carrying out the invention]

[0009] [First Embodiment] (Configuration of magnetic core 1) The configuration of the magnetic core 1 according to the first embodiment of the present invention will be described below with reference to the drawings. Figure 1 is a perspective view of the magnetic core 1. Figure 2 is a cross-sectional view of the magnetic core 1 viewed in the fourth direction DIR4.

[0010] In this specification, directions are defined as follows: The direction in which the tooth body portion 31 extends is defined as the first direction DIR1. The direction along the rotation axis of the brushless motor 100 when the magnetic core 1 is incorporated into the brushless motor 100 is defined as the second direction DIR2. The orthogonal projection of the first direction DIR1 onto a plane perpendicular to the second direction DIR2 is defined as the third direction DIR3. The third direction DIR3 is different from the first direction DIR1. Furthermore, the direction perpendicular to the second direction DIR2 and the third direction DIR3 is defined as the fourth direction DIR4. However, the first direction DIR1, the second direction DIR2, the third direction DIR3 and the fourth direction DIR4 are directions defined for illustrative purposes. Therefore, the first direction DIR1, second direction DIR2, third direction DIR3, and fourth direction DIR4 of the magnetic core 1 during actual use do not necessarily have to be the same as the first direction DIR1, second direction DIR2, third direction DIR3, and fourth direction DIR4 in this embodiment.

[0011] The magnetic core 1 is used in the brushless motor 100. The brushless motor 100 is an example of the "rotating electrical machine" of the present invention.

[0012] As shown in FIG. 1, the magnetic core 1 includes a core back portion 2 and a tooth portion 3. The magnetic core 1 is a soft magnetic material. When a magnetic field is applied from the outside, the soft magnetic material is magnetized. Then, when the application of the magnetic field is stopped, the soft magnetic material loses its magnetization. Such a soft magnetic material is, for example, iron.

[0013] The magnetic core 1 is a molded body formed from soft magnetic powder. That is, each of the core back portion 2 and the tooth portion 3 is a molded body 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 an epoxy resin which is an example of the binder. Such a magnetic core 1 is produced, for example, by press molding. Also, an insulation treatment is applied to the outer surface of the magnetic core 1.

[0014] As shown in FIGS. 1 and 2, the core back portion 2 has a first main surface S1 and a second main surface S2 arranged in the third direction DIR3. The second main surface S2 is located in the third direction DIR3 with respect to the first main surface S1. Also, as shown in FIG. 1, each of the first main surface S1 and the second main surface S2 has a rectangular shape when viewed in the third direction DIR3. Incidentally, as shown in FIG. 2, the core back portion 2 has a geometric center GC2. The geometric center GC2 is the arithmetic mean position taken over all the points belonging to the core back portion 2. Also, the core back portion 2 has a shape that is symmetric with respect to a plane orthogonal to the second direction DIR2.

[0015] As shown in FIG. 1, the tooth portion 3 includes a tooth main body portion 31 and a tooth tip portion 32. Note that, as shown in FIG. 2, the tooth portion 3 has a geometric center GC3. The geometric center GC3 is the arithmetic mean position taken over all points belonging to the tooth portion 3. The tooth main body portion 31 extends from the core back portion 2 in the first direction DIR1. More specifically, the tooth main body portion 31 extends from the second main surface S2 in the first direction DIR1. Note that the first direction DIR1 is not orthogonal to the second direction DIR2. Therefore, the third direction DIR3 is different from the first direction DIR1. Further, the tooth main body portion 31 is quadrangular prism-shaped. Note that the tooth main body portion 31 has a geometric center GC31. The geometric center GC31 is the arithmetic mean position taken over all points belonging to the tooth main body portion 31.

[0016] The tooth main body portion 31 is shown in FIG. 2 As shown, it has a first end E1 and a second end E2 which are both ends with respect to the second direction DIR2. The first end E1 is located in the second direction DIR2 relative to the second end E2. Note that, as shown in FIG. 2, the tooth main body portion 31 has a geometric center GC31. Also, the position PGC31 of the geometric center GC31 of the tooth main body portion 31 in the second direction DIR2 is equal to the position PGC31 of the geometric center GC31 of the core back portion 2. As shown in FIGS. 3 and 4, the second direction DIR2 is the direction along the rotation axis of the brushless motor 100 when the magnetic core 1 is incorporated into the brushless motor 100.

[0017] As shown in FIGS. 1 and 2, the tooth tip portion 32 has a third main surface S3 and a fourth main surface S4 arranged in the third direction DIR3. The fourth main surface S4 is located in the third direction DIR3 relative to the third main surface S3. Also, each of the third main surface S3 and the fourth main surface S4 has a rectangular shape as shown in FIG. 1 when viewed in the third direction DIR3. Note that, as shown in FIG. 2, the tooth tip portion 32 has a geometric center GC32. The geometric center GC32 is the arithmetic mean position taken over all points belonging to the tooth tip portion 32. Also, the position PGC of the geometric center GC32 of the tooth tip portion 32 in the second direction DIR2 32This is equal to the position PGC2 of the geometric center GC2 of the core back portion 2. Furthermore, the tooth tip portion 32 has a shape that is symmetrical with respect to a plane perpendicular to the second direction DIR2.

[0018] Furthermore, as shown in Figure 1, the tooth tip portion 32 has a first end face EF1 facing the second direction DIR2, and a second end face EF2 facing the opposite direction of the second direction DIR2. The first end face EF1 is located further in the second direction DIR2 than the second end face EF2. As shown in Figure 1, such a tooth tip portion 32 is provided at the tip of the tooth body portion 31 with respect to the first direction DIR1.

[0019] As shown in Figure 1, the outer edge O2 of the core back portion 2, viewed in the third direction DIR3, surrounds the outer edge O31 of the tooth body portion 31, also viewed in the third direction DIR3. Similarly, the outer edge O32 of the tooth tip portion 32, viewed in the third direction DIR3, surrounds the outer edge O31 of the tooth body portion 31, also viewed in the third direction DIR3. Furthermore, the length of the tooth body portion 31 in the second direction DIR2 is uniform in the third direction DIR3, as shown in Figure 2.

[0020] For the second direction DIR2, the position PGC3 of the geometric center GC3 of the teeth portion 3 is equal to the position PGC2 of the geometric center GC2 of the core back portion 2, as shown in Figure 2.

[0021] Here, the line connecting the geometric centers of the cross-sections of the tooth body 31 perpendicular to the third direction DIR3 is defined as the first line L1. The geometric center of the cross-section of the tooth body 31 perpendicular to the third direction DIR3 is the position of the arithmetic mean taken over all points belonging to the cross-section of the tooth body 31 perpendicular to the third direction DIR3. In this embodiment, the first line L1 is a straight line, as shown in Figure 2. Furthermore, the position of the first line L1 at the tip of the tooth body 31 with respect to the first direction DIR1 and the position of the first line L1 at the end of the tooth body 31 opposite to the tip are offset in the second direction DIR2. More specifically, in this embodiment, the first line L1 at the tip of the tooth body 31 with respect to the first direction DIR1 is located in the opposite direction of the second direction DIR2 than the first line L1 at the end of the tooth body 31 opposite to the tip with respect to the first direction DIR1.

[0022] (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 3 is an external perspective view of a brushless motor 100 using a magnetic core 1. Figure 4 is an exploded perspective schematic of a brushless motor 100 using a magnetic core 1. In Figure 4, reference numerals are given only to representative magnetic cores 1, coils 13, and insulating members 14 from among the multiple magnetic cores 1, multiple coils 13, and multiple insulating members 14.

[0023] As shown in Figure 4, the brushless motor 100 comprises a rotor 20 and a stator assembly 10. As shown in Figure 4, 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.

[0024] As shown in Figure 4, 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.

[0025] As shown in Figure 4, 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. The rotor member 22 is also positioned such that the position PGC22 in the second direction DIR2 of the geometric center GC22 of the rotor member 22 is equal to the position PGC2 in the second direction DIR2 of the geometric center GC2 of the core back portion 2. Note that the geometric center GC22 is the arithmetic mean position taken over all points belonging to the rotor member 22.

[0026] 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.

[0027] As shown in Figure 4, the stator assembly 10 includes a bearing 11, a housing 12, a plurality of magnetic cores 1, a plurality of coils 13, a plurality of insulating members 14, and a connecting member 15. In other words, the brushless motor 100 includes a magnetic core 1.

[0028] 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 4. 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.

[0029] As shown in Figure 4, the first bearing 11a is located in the second direction DIR2 relative to the second bearing 11b. Also, the first bearing 11a is located in the second direction DIR2 relative to the rotor member 22. The second bearing 11b is located in the opposite direction to the second direction DIR2 relative to the rotor member 22. The second bearing 11b supports the end of the shaft 21 in the direction opposite to the second direction DIR2.

[0030] As shown in Figure 3, the housing 12 has a first housing 12a and a second housing 12b. The first housing 12a is cylindrical, as shown in Figures 3 and 4. The central axis of the first housing 12a is the Z-axis. The first housing 12a is located in the second direction DIR2 relative to the second housing 12b. The first housing 12a also has an opening OP. As a result, the end of the shaft 21 in the second direction DIR2 protrudes from the opening OP into the second direction DIR2. In other words, the brushless motor 100 is a single-shaft type.

[0031] The first housing 12a supports the first bearing 11a, a plurality of magnetic cores 1, a plurality of coils 13, and a plurality of insulating members 14. 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.

[0032] The number of magnetic cores 1, coils 13, and insulating members 14 is nine. Each of the nine coils 13 and each of the nine insulating members 14 corresponds to each of the nine magnetic cores 1. More specifically, if a set consists of one magnetic core 1, one coil 13, and one insulating member 14, then the nine sets are arranged in the circumferential direction around the Z-axis. Each set is positioned around the hard magnetic material 24, with a gap between them. The structure of each set is the same. Therefore, we will describe one set consisting of one magnetic core 1, one coil 13, and one insulating member 14.

[0033] 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. As a result, the magnetic core 1 generates a magnetic force that rotates the rotor. As shown in Figure 4, there is an air gap between the magnetic core 1 and the rotor member 22. In this embodiment, the first direction DIR1 is the direction toward the rotation axis of the brushless motor 100 when the magnetic core 1 is incorporated into the brushless motor 100.

[0034] As shown in Figure 4, the coil 13 is wound around the tooth body 31 so as to be positioned around the magnetic core 1 when viewed radially with respect to the Z-axis. 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 film. The coil 13 generates a magnetic field when an electric current flows through it.

[0035] The insulating member 14 is an insulator. As shown in Figure 4, the insulating member 14 is placed between the magnetic core 1 and the coil 13. This electrically insulates the magnetic core 1 and the coil 13. In this embodiment, the insulating member 14 is in the form of a film, but it may also be in the form of a plate. Furthermore, the insulating member 14 may be positioned such that a portion of it is placed between the magnetic core 1 and the coil 13. Therefore, the insulating member 14 may be placed over the entire surface of the coil 13.

[0036] The connecting member 15 is electrically connected to the coil 13. The connecting member 15 is, for example, a substrate. The substrate includes a substrate body (not shown) and a plurality of mounting electrodes (not shown) provided on the surface of the substrate body. The substrate body is a glass epoxy substrate. The plurality of mounting electrodes are copper electrodes. The coil 13 is electrically connected to each of the plurality of mounting electrodes.

[0037] 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.

[0038] [effect] The magnetic core 1 allows for miniaturization of the brushless motor 100. The reason why the brushless motor 100 can be miniaturized will be explained with reference to the drawings. Figure 5 is a cross-sectional view of the magnetic core 6 according to the comparative example, viewed in the fourth direction DIR4. Figure 6 is a cross-sectional view of the magnetic core 6 and connecting member 15 according to the comparative example, with the coil 13 wound around it, viewed in the fourth direction DIR4. Figure 7 is a cross-sectional view of the magnetic core 1 and connecting member 15, with the coil 13 wound around it, viewed in the fourth direction DIR4. Note that in Figures 6 and 7, the number of turns of the coil 13 is equal to that of the other.

[0039] First, the magnetic core 6 of the comparative example will be described. Note that only the parts of the magnetic core 6 of the comparative example that differ from magnetic core 1 will be described, and the rest will be omitted. In the magnetic core 6 of the comparative example, the third direction DIR3 is equal to the first direction DIR1, as shown in Figure 5. Therefore, in the magnetic core 6 of the comparative example, the position of the first line L1 at the tip of the tooth body 31 in the second direction DIR2 with respect to the first direction DIR1 is equal to the position of the first line L1 at the end of the tooth body 31 opposite to the tip in the second direction DIR2. In other words, the position of the first line L1 at the tip of the tooth body 31 in the first direction DIR1 and the position of the first line L1 at the end of the tooth body 31 opposite to the tip are not shifted in the second direction DIR2.

[0040] When the magnetic core 6 according to the comparative example is incorporated into the brushless motor 100, the coil 13 is wound around the tooth body portion 31 as shown in Figure 6. If the connecting member 15 is placed in a region that overlaps with the tooth portion 3 when viewed in the second direction DIR2, and is located in the opposite direction of the second direction DIR2 to the tooth portion 3, the end of the connecting member 15 in the opposite direction of the second direction DIR2 may be located in the opposite direction of the second direction DIR2 to the end of the core back portion 2 in the opposite direction of the second direction DIR2. As a result, the length of the second direction DIR2 of the brushless motor 100 becomes larger.

[0041] In the magnetic core 1, the position of the first line L1 at the tip of the tooth body 31 in the first direction DIR1 is offset in the second direction DIR2 from the position of the first line L1 at the end of the tooth body 31 opposite to the tip. More specifically, the first line L1 at the tip of the tooth body 31 in the first direction DIR1 is located in the opposite direction of the second direction DIR2 than the first line L1 at the end of the tooth body 31 opposite to the tip in the first direction DIR1. As a result, the coil 13 according to the first embodiment of the present invention is located in the second direction DIR2 more than the coil 13 according to the comparative example, as shown in Figure 7. Therefore, even if the connecting member 15 is positioned in a region that overlaps with the tooth portion 3 when viewed in the second direction DIR2, and is located in the opposite direction of the second direction DIR2 to the tooth portion 3, the end of the connecting member 15 in the opposite direction of the second direction DIR2 can be positioned in the second direction DIR2 more than the end of the core back portion 2 in the opposite direction of the second direction DIR2. In this case, the connecting member 15 is located on the core back portion 2 side between the tooth tip portion 32 and the core back portion 2, and is located in the opposite direction of the second direction DIR2 to the tooth body portion 31. As a result, the length of the second direction DIR2 of the brushless motor 100 according to the first embodiment of the present invention can be made smaller than the length of the second direction DIR2 of the brushless motor 100 according to the comparative example. Therefore, the magnetic core 1 makes it possible to reduce the height and size of the brushless motor 100.

[0042] The magnetic core 1 makes it easier to form. More specifically, the core back portion 2 and the tooth tip portion 32 each have a shape that is symmetrical with respect to a plane perpendicular to the second direction DIR2. Therefore, for example, when the magnetic core 1 is manufactured by press molding, the magnetic core 1 can be manufactured using a mold having a shape that is symmetrical with respect to a plane perpendicular to the second direction DIR2, and a punch having a shape that is symmetrical with respect to a plane perpendicular to the second direction DIR2. As a result, the magnetic core 1 makes it easier to form.

[0043] [First variation] The following describes a magnetic core 1a according to the first modification of the present invention with reference to the figures. Figure 8 is a perspective view of the magnetic core 1a. Figure 9 is a cross-sectional view of the magnetic core 1a viewed in the fourth direction DIR4. Note that only the parts of the magnetic core 1a according to the first modification that differ from the magnetic core 1 according to the first embodiment will be described, and the rest will be omitted.

[0044] As shown in Figures 8 and 9, the magnetic core 1a differs from the magnetic core 1 in that the first line L1 is a broken line.

[0045] The magnetic core 1a described above also produces the same effect as the magnetic core 1.

[0046] [Second Embodiment] The stator assembly 10a according to the second embodiment of the present invention will be described below with reference to the figures. Figure 10 is an example of a cross-sectional view of the magnetic core 1 around which the coil 13 is wound and the wiring member 16 as viewed in the fourth direction DIR4. Note that only the parts of the stator assembly 10a according to the second embodiment that differ from the stator assembly 10 according to the first embodiment will be described, and the rest will be omitted.

[0047] The stator assembly 10a differs from the stator assembly 10 in that it further includes a wiring member 16. The wiring member 16 is, for example, a busbar.

[0048] As shown in Figure 10, the wiring member 16 is positioned in a region that overlaps with the teeth portion 3 when viewed in the second direction DIR2, and is located further in the second direction DIR2 than the teeth portion 3.

[0049] According to the stator assembly 10a, even if the wiring member 16 is positioned in a region that overlaps with the teeth portion 3 when viewed in the second direction DIR2, and is located in a region that is further in the second direction DIR2 than the teeth portion 3, the end of the wiring member 16 in the second direction DIR2 can be positioned in the opposite direction of the second direction DIR2 than the end of the core back portion 2 in the second direction DIR2. In this case, the wiring member 16 is located on the teeth tip portion 32 side between the teeth tip portion 32 and the core back portion 2, and is located in a second direction DIR2 further than the teeth body portion 31. As a result, the length of the second direction DIR2 of the brushless motor 100 can be made smaller than the length of the second direction DIR2 of the brushless motor 100 according to the comparative example. Therefore, according to the stator assembly 10a, the brushless motor 100 can be made lower profile and smaller.

[0050] Furthermore, the connecting member 15 may be located on the tooth tip 32 side between the tooth tip 32 and the core back 2, and in the second direction DIR2 relative to the tooth body 31, while the wiring member 16 may be located on the core back 2 side between the tooth tip 32 and the core back 2, and in the opposite direction to the second direction DIR2 relative to the tooth body 31. In this case as well, the brushless motor 100 can be made lower profile and smaller.

[0051] [Other embodiments] The magnetic core according to the present invention is not limited to magnetic cores 1 and 1a, but can be modified within the scope of its gist. Furthermore, the structures of magnetic cores 1 and 1a may be arbitrarily combined.

[0052] The stator assembly according to the present invention is not limited to stator assemblies 10 and 10a, but can be modified within the scope of its gist. Furthermore, the structures of stator assemblies 10 and 10a may be combined in any way.

[0053] 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. In this case, the rotating electric machine only needs to have at least one of the magnetic cores 1, 1a, and may also have brushes.

[0054] The magnetic cores 1 and 1a may be manufactured by laminating electromagnetic steel sheets. The magnetic cores 1 and 1a may be made of soft magnetic material.

[0055] Furthermore, the outer surface of the magnetic cores 1,1a does not necessarily need to be insulated.

[0056] Furthermore, the first main surface S1 and the second main surface S2 of the core back portion 2 do not necessarily have to be rectangular when viewed in the third direction DIR3.

[0057] Furthermore, the core back portion 2 does not necessarily have to have a shape that is symmetrical with respect to a plane perpendicular to the second direction DIR2.

[0058] Note that the main body of the teeth 31 does not have to be in the shape of a rectangular prism.

[0059] Note that the position PGC31 of the geometric center GC31 of the tooth body 31 in the second direction DIR2 may be different from the position PGC31 of the geometric center GC31 of the core back portion 2.

[0060] Furthermore, the third main surface S3 and the fourth main surface S4 of the tooth tip portion 32 do not necessarily have to be rectangular in shape when viewed in the third direction DIR3.

[0061] Furthermore, the position PGC is the second direction DIR2 of the geometric center GC32 of the tooth tip portion 32. 32 The position of the geometric center GC2 of the core back section 2 may be different from the position PGC2.

[0062] Furthermore, the tooth tip portion 32 does not necessarily have to have a shape that is symmetrical with respect to a plane perpendicular to the second direction DIR2.

[0063] Furthermore, the outer edge O2 of the core back portion 2, as viewed in the third direction DIR3, does not have to surround the outer edge O31 of the tooth body portion 31, as viewed in the third direction DIR3. Also, the outer edge O32 of the tooth tip portion 32, as viewed in the third direction DIR3, does not have to surround the outer edge O31 of the tooth body portion 31, as viewed in the third direction DIR3.

[0064] Furthermore, the length of the tooth body portion 31 in the second direction DIR2 does not need to be uniform in the third direction DIR3.

[0065] Note that the first line L1 is not limited to a straight line or a broken line; it may also be a curve. Furthermore, the first line L1 only needs to include a straight line or a curve.

[0066] Furthermore, the first line L1 at the tip of the tooth body 31 with respect to the first direction DIR1 may be located in the second direction DIR2 more than the first line L1 at the end of the tooth body 31 opposite to the tip of the tooth body 31 with respect to the first direction DIR1. In this case, even if the connecting member 15 is placed in a region that overlaps with the tooth portion 3 when viewed in the second direction DIR2, and is located in the opposite direction of the second direction DIR2 from the tooth portion 3, the end of the connecting member 15 in the opposite direction of the second direction DIR2 can be positioned in the second direction DIR2 more than the end of the core back portion 2 in the opposite direction of the second direction DIR2. Therefore, even in this case, the length of the second direction DIR2 of the brushless motor 100 can be made smaller than the length of the second direction DIR2 of the brushless motor 100 in the comparative example. As a result, the brushless motor 100 can be miniaturized.

[0067] The brushless motor 100 may also be of the outer rotor type. In this case, the first direction DIR1 is in the opposite direction to the direction toward the rotation axis of the brushless motor 100 when the magnetic core 1 is incorporated into the brushless motor 100.

[0068] 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.

[0069] Note that the first bearing 11a and the second bearing 11b are not limited to ball bearings.

[0070] Furthermore, the materials used for the first housing 12a and the second housing 12b can be any material with high rigidity.

[0071] Note that the number of each of the multiple magnetic cores 1, multiple coils 13, and multiple insulating members 14 is not limited to nine. Each of the multiple coils 13 and each of the multiple insulating members 14 may be provided in correspondence with each of the multiple magnetic cores 1.

[0072] Note that the connection member 15 is not limited to a circuit board. The connection member 15 may be, for example, a terminal block. Also, in the stator assembly 10a, the connection member 15 is not an essential component.

[0073] Note that the wiring component 16 is not limited to a busbar. The wiring component 16 may be, for example, a cable.

[0074] The present invention has the following configuration.

[0075] (1) A magnetic core used in rotating electrical machinery, Core back section, A tooth portion including a tooth body portion extending in a first direction from the core back portion, and a tooth tip portion provided at the tip of the tooth body portion in the first direction, It is equipped with, With respect to a second direction that is aligned with the rotation axis of the rotating electric machine when the magnetic core is incorporated into the rotating electric machine, the position of the geometric center of the teeth portion is equal to the position of the geometric center of the core back portion. The orthogonal projection of the first direction onto a plane perpendicular to the second direction is defined as the third direction. The line connecting the geometric centers of the cross-sections of the tooth body portion perpendicular to the third direction is defined as the first line. The position of the first line at the tip of the tooth body and the position of the first line at the end of the tooth body opposite to the tip are offset in the second direction. Magnetic core.

[0076] (2) The first line is a straight line. (1) The magnetic core described above.

[0077] (3) The first line mentioned above is a broken line. (1) The magnetic core described above.

[0078] (4) The core back portion has a shape that is symmetrical with respect to a plane perpendicular to the second direction, The tip of the tooth has a shape that is symmetrical with respect to a plane perpendicular to the second direction. A magnetic core as described in any of (1) to (3).

[0079] (5) The length of the tooth body in the second direction is uniform in the third direction. A magnetic core as described in any of (1) to (4).

[0080] (6) The core back portion and the teeth portion are each molded bodies formed from soft magnetic powder. A magnetic core as described in any of (1) to (5).

[0081] (7) The material of the aforementioned soft magnetic powder includes iron and resin. (6) The magnetic core described above.

[0082] (8) A magnetic core as described in any of (1) to (7), Connecting components and It is equipped with, The first line at the end of the tooth body opposite to the tip is located in the second direction more than the first line at the tip of the tooth body. The connecting member is located on the core back portion side between the tooth tip portion and the core back portion, and in the opposite direction to the tooth body portion in the second direction. Stator assembly.

[0083] (9) A magnetic core as described in any of (1) to (7), Wiring components and It is equipped with, The first line at the end of the tooth body opposite to the tip is located in the second direction more than the first line at the tip of the tooth body. The wiring member is located on the tooth tip side between the tooth tip and the core back portion, and is positioned in the second direction relative to the tooth body portion. Stator assembly.

[0084] (10) (1) to (7) comprising a magnetic core as described in any of the above, Rotating electrical machinery.

[0085] (11) (1) to (7) comprising a magnetic core as described in any of the above, Brushless motor. [Explanation of Symbols]

[0086] 1,1a,6: Magnetic core 2: Core back section 3: Teeth Department 10,10a: Stator assembly 11: Bearings 11a: First bearing 11b: Second bearing 12: Cabinet 12a: First enclosure 12b: Second cabinet 13: Coil 14: Insulating material 15: Connection components 16: Wiring components 20: Rotor 21: Shaft 22: Rotor component 23: Soft magnetic material 24:Hard magnetic material 31: Teeth main body 32: Tooth tip 100: Brushless motor DIR1: 1st direction DIR2:Second direction DIR3: Third direction DIR4: Fourth direction E1: 1st end E2: 2nd end EF1: 1st end face EF2: 2nd end face GC2,GC22,GC3,GC31,GC32: Geometric center L1: 1st line O2, O31, O32: outer edge OP: Opening S1: First main surface S2: 2nd principal surface S3: Third main surface S4: Fourth main surface

Claims

1. A magnetic core used in rotating electrical machinery, Core back section, A tooth portion including a tooth body portion extending in a first direction from the core back portion, and a tooth tip portion provided at the tip of the tooth body portion in the first direction, It is equipped with, With respect to a second direction that is aligned with the rotation axis of the rotating electric machine when the magnetic core is incorporated into the rotating electric machine, the position of the geometric center of the teeth portion is equal to the position of the geometric center of the core back portion. The orthogonal projection of the first direction onto a plane perpendicular to the second direction is defined as the third direction. The line connecting the geometric centers of the cross-sections of the tooth body portion perpendicular to the third direction is defined as the first line. The position of the first line at the tip of the tooth body and the position of the first line at the end of the tooth body opposite to the tip are offset in the second direction. Magnetic core.

2. The first line is a straight line. A magnetic core according to claim 1.

3. The first line is a broken line. A magnetic core according to claim 1.

4. The core back portion has a shape that is symmetrical with respect to a plane perpendicular to the second direction. The tip of the tooth has a shape that is symmetrical with respect to a plane perpendicular to the second direction. A magnetic core according to any one of claims 1 to 3.

5. The length of the tooth body in the second direction is uniform in the third direction. A magnetic core according to any one of claims 1 to 3.

6. The core back portion and the teeth portion are each molded bodies formed from soft magnetic powder. A magnetic core according to any one of claims 1 to 3.

7. The material of the aforementioned soft magnetic powder includes iron and resin. The magnetic core according to claim 6.

8. A magnetic core according to any one of claims 1 to 3, Connecting components and It is equipped with, The first line at the end of the tooth body opposite to the tip is located in the second direction more than the first line at the tip of the tooth body. The connecting member is located on the core back side between the tooth tip and the core back portion, and in the opposite direction to the tooth body portion in the second direction. Stator assembly.

9. A magnetic core according to any one of claims 1 to 3, Wiring components and It is equipped with, The first line at the end of the tooth body opposite to the tip is located in the second direction more than the first line at the tip of the tooth body. The wiring member is located on the tooth tip side between the tooth tip and the core back portion, and is positioned in the second direction relative to the tooth body portion. Stator assembly.

10. A magnetic core comprising the magnetic core according to any one of claims 1 to 3, Rotating electrical machinery.

11. A magnetic core comprising the magnetic core according to any one of claims 1 to 3, Brushless motor.

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