Stator core and motor

Abstract

To provide a motor having a stator core that can enhance a dielectric voltage while suppressing deformation of a bridging part of an inner core at the time of press-processing.SOLUTION: A stator core 1 includes an inner core 6 and an outer core 7 in the shape of a ring located outside the inner core 6. The inner core 6 includes a plurality of teeth parts 15 located along a radial direction and bridging parts 16 for connecting the edges on the inner diameter side of the teeth parts 15 next to one another in a circumferential direction to the bridge parts 16, respectively. The bridging parts 16 have recessed parts 17 recessed from the center part to the inner diameter side in the circumferential direction.SELECTED DRAWING: Figure 2

Description

Technical Field

[0001] The present invention relates to a stator core and a motor using the stator core.

Background Art

[0002] Conventionally, in order to increase the induced voltage of a motor, there is a motor in which the radial width of a bridging portion that connects the tooth portions of the inner core of a stator core provided in the motor is made thinner. Patent Document 1 describes a configuration in which, in a stator provided with a ring-shaped yoke core, a tooth core arranged on the inner peripheral side of the yoke core, and a bridging portion that connects the inner peripheral sides of the tooth cores, the radial thickness of the bridging portion is made thinner in order to increase the induced voltage.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] However, in the above-described conventional stator core, in order to increase the induced voltage of the motor, if the radial width of the bridging portion of the inner core is excessively thinned, when the inner core is press-worked, the bridging portion is greatly deformed, partial cutting occurs from the deformed portion, and there is a problem that the tool life is reduced.

[0005] Here, with reference to FIG. 7, the deformation during press working of a conventional stator core will be described. FIG. 7 is a schematic diagram showing the deformation of a conventional stator core by press working, where (a) shows the dimensions and shape in design, (b) shows the state during press working, and (c) shows the state after press working. In a conventional stator core, in order to increase the induced voltage, as shown in FIG. 7(a), it was necessary to overall thin the radial width of the bridging portion 202 that connects the teeth portions 201 of the inner core 200. However, if the radial width of the bridging portion 202 is thinned beyond a certain limit, as shown in FIGS. 7(b) and (c), the entire bridging portion 202 is gradually drawn inward toward the inner diameter side during press working and is greatly deformed. Therefore, there was a limit to increasing the induced voltage without deforming the bridging portion.

[0006] Therefore, an object of the present invention is to provide a motor using a stator core capable of increasing the induced voltage while suppressing deformation of the bridging portion of the inner core during press working.

Means for Solving the Problems

[0007] In order to achieve the above object, the invention according to claim 1 is a stator core including an inner core and a ring-shaped outer core disposed outside the inner core, wherein the inner core is composed of a plurality of teeth portions arranged along the radial direction and a bridging portion that connects the inner diameter side ends of the teeth portions adjacent in the circumferential direction, and the bridging portion has a recess that recesses toward the inner diameter side and / or the outer diameter side at the central portion in the circumferential direction.

[0008] Further, the invention according to claim 2 is the invention according to claim 1, wherein the recess has a semi-circular shape. Further, the invention according to claim 3 is the invention according to claim 1, wherein the recess has a V-shaped shape that protrudes toward the recessed side. Further, the invention according to claim 4 is a motor having the stator core according to any one of claims 1 to 3 and a rotor that penetrates the stator core.

Effects of the Invention

[0009] According to the present invention, a stator core used in a motor is composed of an inner core and a ring-shaped outer core disposed outside the inner core. The inner core is constituted by a plurality of teeth portions arranged along the radial direction and a bridging portion that connects the inner diameter side ends of the teeth portions adjacent in the circumferential direction to each other. The bridging portion has a recess that is recessed toward the inner diameter side and / or the outer diameter side at the central portion in the circumferential direction. Therefore, by thinning a part of the width of the bridging portion in the radial direction by the recess, it is possible to increase the induced voltage, and during the pressing process of the inner core, the deformation of the bridging portion is suppressed around the recess, so that the bridging portion does not deform significantly. Thus, it is possible to increase the induced voltage while suppressing the deformation of the bridging portion of the inner core during the pressing process.

Brief Description of the Drawings

[0010]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Embodiments for Carrying Out the Invention

[0011] Hereinafter, an example of a stator core according to an embodiment of the present invention and a motor using the stator core will be described with reference to the drawings.

[0012] Figure 1 is a cross-sectional view showing the motor 100 of the present invention. The motor 100 includes a stator core 1 which is a stator, a rotor 2 which is a rotor, a bearing 3 for fixing the rotor 2, a bracket 4 for supporting various members, and a cover 5 for housing various members. The stator core 1 is composed of an inner core 6 and an outer core 7, and a coil 9 wound around a bobbin 8 is attached thereto. The rotor 2 is composed of a shaft 10 which is a rotating shaft and a rotor core 11 which pivotally supports the shaft 10. A magnet 12 is provided between the stator core 1 and the rotor core 11.

[0013] Figure 2 is a view showing the stator core 1 of the present invention. Figure 3 is an enlarged view of part A in Figure 2. Figure 4 is a schematic view showing the deformation of the stator core 1 of the present invention by pressing, where (a) shows the designed dimensions and shape, (b) shows the state during pressing, and (c) shows the state after pressing. Figure 5 is a table showing the feasible dimensions of the remaining width 18 of the bridging portion 16.

[0014] The stator core 1 is a member used as a stator in the motor 100, and is composed of an inner core 6 and a ring-shaped outer core 7 disposed outside the inner core 6. The stator core 1 is formed by pressing a plurality of laminated electromagnetic steel sheets.

[0015] The inner core 6 is composed of a plurality of tooth portions 15, 15... arranged along the radial direction and bridging portions 16, 16... connecting the inner diameter side ends of the adjacent tooth portions 15, 15... in the circumferential direction. The outer core 7 is a ring-shaped member disposed outside the inner core 6, and its dimensions and shape are determined such that the inner side of the outer core 7 is in contact with the outer diameter side ends of the tooth portions 15, 15... respectively.

[0016] The tooth portions 15, 15... are fixed such that the outer diameter side end portions are in contact with the inner diameter of the outer core 7. As shown in FIGS. 3 and 4(a), each bridging portion 16 has a recess 17 that is recessed toward the inner diameter side at the central portion in the circumferential direction. In the embodiment, the recess 17 has a semi-circular shape and is formed, for example, by punching with a round pin or the like. And, due to the recess 17, it becomes possible to partially reduce the radial width of the bridging portion 16, and it becomes possible to increase the induced voltage.

[0017] Also, as shown in FIGS. 4(b) and (c), the bridging portion 16 of the inner core 6 is deformed by being drawn inward only around the recess 17 during the pressing process. Therefore, the bridging portion 16 of the inner core 6 does not deform significantly.

[0018] Also, the dimension of the remaining width 18, which is the width from the inner diameter side end portion of the recess 17 to the inner diameter of the bridging portion 6, is appropriately determined. The achievable dimension of the remaining width 18 is determined by the thickness of the electromagnetic steel sheet before being laminated, which is the material of the inner core 6. Specifically, as shown in FIG. 5, when the thickness of the electromagnetic steel sheet is 0.50 mm, the remaining width 18 is 0.20 mm or more; when the thickness of the electromagnetic steel sheet is 0.35 mm, the remaining width 18 is 0.15 mm or more; when the thickness of the electromagnetic steel sheet is 0.25 mm, the remaining width 18 is 0.13 mm or more; when the thickness of the electromagnetic steel sheet is 0.20 mm, the remaining width 18 is 0.13 mm or more.

[0019] According to the stator core 1 used in the motor 100 of the embodiment as described above, it is composed of the inner core 6 and the ring-shaped outer core 7 disposed outside the inner core 6. The inner core 6 is composed of a plurality of tooth portions 15, 15... arranged along the radial direction and bridging portions 16, 16... that connect the inner diameter side end portions of the circumferentially adjacent tooth portions 15, 15... respectively. The bridging portions 16, 16 have recesses 17 that are recessed toward the inner diameter side at the central portion in the circumferential direction.

[0020] Therefore, the recess 17 thins a part of the radial width of the bridging portion 6, making it possible to increase the induced voltage. Also, during the pressing process of the inner core 6, the deformation of the bridging portion 16 is suppressed around the recess 17, so the bridging portion 16 does not deform significantly. Thus, it is possible to increase the induced voltage while suppressing the deformation of the bridging portion 16 of the inner core 6 during the pressing process.

[0021] Note that the stator core according to the present invention and the motor using the stator core are not limited to the aspects of the above embodiments at all. Not only the stator core and the overall configuration of the stator core, but also, for example, the configuration of the inner core can be appropriately changed as needed.

[0022] For example, in the embodiment, the inner core 6 is provided with the recess 17 so as to recess from the outer diameter side to the inner diameter side at the central portion in the circumferential direction of the bridging portion 6. However, as shown in FIG. 6(a), the recess 17 may be provided so as to recess from the inner diameter side to the outer diameter side at the central portion in the circumferential direction of the bridging portion 6. Also, as shown in FIG. 6(b), a configuration may be adopted in which both a recess 17 that recesses from the inner diameter side to the outer diameter side and a recess 17 that recesses from the outer diameter side to the inner diameter side are provided at the central portion in the circumferential direction of the bridging portion. Also, in the embodiment, the recess 17 has a semi-circular shape, but as shown in FIG. 6(c), it may have a V-shaped configuration that protrudes toward the recessed side.

Explanation of Reference Numerals

[0023] 1 ··· Stator core, 2 ··· Rotor, 3 ··· Bearing, 4 ··· Bracket, 5 ··· Cover, 6,200 ··· Inner core, 7 ··· Outer core, 8 ··· Bobbin, 9 ··· Coil, 10 ··· Shaft, 11 ··· Rotor core, 12 ··· Magnet, 15,201 ··· Tooth portion, 16,202 ··· Bridging portion, 17 ··· Recess, 18 ··· Remaining width.

Claims

1. A stator core comprising an inner core and a ring-shaped outer core disposed outside the inner core, wherein the inner core is composed of a plurality of teeth portions arranged along the radial direction and a bridging portion that connects the inner diameter side ends of the adjacent teeth portions in the circumferential direction, and the bridging portion has a recess that is recessed toward the inner diameter side and / or the outer diameter side at the central portion in the circumferential direction. The stator core is characterized by this.

2. The stator core according to claim 1, wherein the recess has a semi-circular shape.

3. The stator core according to claim 1, wherein the recess has a V-shaped protrusion toward the recessed side.

4. A motor having the stator core according to any one of claims 1 to 3 and a rotor that penetrates the stator core.

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