Stator core and motor

Abstract

To provide a motor having a stator core which makes it easier to determine the position of an inner core to an outer core.SOLUTION: A stator core 1 includes an inner core 6 and an outer core 7 in the shape of a ring outside the inner core 6. The inner core 6 includes a plurality of teeth parts 15 arranged along a radial direction and bridging parts 16 connecting the edge parts on inner-diameter sides of the teeth parts 15 next to one another in circumferential direction. The outer core 7 and the teeth parts 15 are connected by the contact of outside contact parts 21, being cylindrical recessed parts recessed in the direction of the outer diameter, and inside contact parts 20, being cylindrical protruding parts that fit to the recessed parts of the outside contact part 21 by expanding toward the outer diameter side.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, an inner core and an outer core are press-worked from a single electromagnetic steel sheet, and the phases are aligned in the circumferential direction and joined from a state where the phases of the outer core and the inner core arranged inside the outer core are shifted. There is a stator core. Patent Document 1 discloses 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 connecting the inner peripheral sides of the tooth cores. From the drawings, the inner periphery having the same curvature as the outer periphery of the yoke core and the outer diameter side end of the tooth core are joined.

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 conventional stator core, when joining the inner core to the outer core, it is necessary to join the outer diameter side end of the tooth portion having the same curvature as the inner periphery of the outer core to the inner periphery of the outer core. There was a problem that positioning was difficult.

[0005] Therefore, an object of the present invention is to provide a motor using a stator core that facilitates positioning of the inner core with respect to the outer core.

Means for Solving the Problems

[0006] In order to achieve the above object, the invention according to claim 1 is a stator core having a two-part structure including an inner core and a ring-shaped outer core disposed outside the inner core. 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. The inner core and the outer core are coupled by the contact between an outer contact portion formed on the inner circumference of the outer core and an inner contact portion formed on the outer diameter side end of each teeth portion. The outer contact portion is an arc-shaped concave portion that is recessed toward the outer diameter side, and the inner contact portion is an arc-shaped convex portion that bulges toward the outer diameter side and fits into the concave portion. Further, the invention according to claim 2 is the invention according to claim 1, wherein the arc-shaped radius of the outer contact portion and the inner contact portion is equal to or greater than the width of the teeth portion, and the arc-shaped center points of the outer contact portion and the inner contact portion are located between the center point of the inner core and the outer diameter side end of the inner contact portion.

[0007] Further, the invention according to claim 3 is a stator core having a two-part structure including an inner core and a ring-shaped outer core disposed outside the inner core. The inner core is composed of a plurality of teeth portions arranged in the radial direction and a bridging portion that connects the inner diameter side ends of the adjacent teeth portions in the circumferential direction. The inner core and the outer core are coupled by the contact between an outer contact portion formed on the inner circumference of the outer core and an inner contact portion formed on the outer diameter side end of each teeth portion. The outer contact portion and the inner contact portion are flat surfaces that are in surface contact with each other. Further, the invention according to claim 4 is the invention according to claim 3, wherein each flat surface is formed in a tangential direction with respect to the outer peripheral surface of the outer core through which the center line of the teeth portion passes. Further, the invention according to claim 5 is a motor having the stator core according to any one of claims 1 to 4 and a rotor that penetrates the stator core.

Advantages of the Invention

[0008] According to the invention described in claim 1, the stator core used in the 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. And the outer core and each teeth portion are joined by the contact of an outer contact portion, which is an arc-shaped recess recessed on the outer diameter side, and an inner contact portion, which is an arc-shaped protrusion that bulges on the outer diameter side and fits into the recess of the outer contact portion. Therefore, since the inner contact portion and the outer contact portion where the outer core and each teeth portion come into contact with each other are both arc-shaped, the positioning operation of the inner core to the outer core becomes easy. Also, during shrink fitting, the arc shapes of the inner contact portion and the outer contact portion can be bent toward the center of the outer core and joined neatly.

[0009] Moreover, according to the invention described in claim 3, the stator core used in the 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. And the outer core and each teeth portion are joined by the joining of an outer contact portion and an inner contact portion, which are flat surfaces that are in surface contact with each other. Therefore, the positioning operation of the inner core with respect to the outer core becomes easy. Also, since the inner contact portion and the outer contact portion are flat surfaces, it becomes easy to rotate when the inner core is disposed inside the outer core and moved to the fitting position.

Brief Description of the Drawings

[0010]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Mode for Carrying Out the Invention

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

[0012] Fig. 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. Further, a magnet 12 is provided between the stator core 1 and the rotor core 11.

[0013] The first embodiment of the stator core 1 will be described. Fig. 2 is a diagram showing the stator core 1 of the first embodiment. Fig. 3 is an enlarged view of part A in Fig. 2. Fig. 4 is a diagram showing the stator core 1 of the first embodiment during press working.

[0014] As shown in FIGS. 2 and 3, 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. 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 circumferentially adjacent tooth portions 15, 15... The outer core 7 is a ring-shaped member disposed outside the inner core 6. And, an inner contact portion 20 is provided at the outer diameter side end of each tooth portion 15, and outer contact portions 21, 21... are provided on the inner circumference of the outer core 7 so as to contact the inner contact portion 20 of each tooth portion 15.

[0015] The inner contact portion 20 has an arc-shaped convex portion shape that bulges outward from the tip of the tooth portion 15. Further, the outer contact portion 21 has an arc-shaped concave portion shape that is concave outward. And, the arc-shaped convex portion of the inner contact portion 20 and the arc-shaped concave portion of the outer contact portion 21 are dimensioned and shaped to fit. The arc-shaped radius of the inner contact portion 20 and the outer contact portion 21 is equal to or greater than the circumferential width of the tooth portion 15, and the arc-shaped center points of the inner contact portion 20 and the outer contact portion 21 are between the center point of the inner core 6 and the outer diameter side end of the inner contact portion 20.

[0016] The process for creating the stator core 1 will be described. When generating the inner core 6 and the outer core 7 from a single electromagnetic steel sheet by pressing so that the inner core 6 is disposed inside the outer core 7, a clearance equal to or greater than the thickness of the electromagnetic steel sheet is required between the outer diameter of the inner core 6 and the inner diameter of the outer core 7. Therefore, as shown in FIG. 4, it is generated from a single electromagnetic steel sheet by pressing so that the inner contact portion 20 of the tooth portion 15 is positioned between the outer contact portions 21 of the outer core 7. And, after pressing, the inner core 6 disposed inside the outer core 7 is phase-shifted so that the inner contact portion 20 and the outer contact portion 21 come into contact with each other, and shrink-fitted, whereby the inner contact portion 20 and the outer contact portion 21 are joined to form the stator core 1.

[0017] According to the stator core 1 used in the motor 100 of the embodiment as described above, it is composed of an inner core 6 and a 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 ends of the tooth portions 15, 15... adjacent in the circumferential direction. And the outer core 7 and each tooth portion 15 are joined by the contact between an outer contact portion 21 which is an arc-shaped recess on the outer diameter side and an inner contact portion 20 which is an arc-shaped protrusion that bulges on the outer diameter side and fits into the recess of the outer contact portion 21.

[0018] Therefore, since the inner contact portion 20 and the outer contact portion 21 where the outer core 7 and each tooth portion 15 contact each other are both arc-shaped, the positioning operation of the inner core 6 to the outer core 7 becomes easy. Also, during shrink fitting, the arc shapes of the inner contact portion 20 and the outer contact portion 21 can be bent toward the center of the outer core 7 and joined neatly.

[0019] Next, a second embodiment of the stator core 1 will be described. FIG. 5 is a view showing the stator core 1 of the second embodiment. FIG. 6 is an enlarged view of part B in FIG. 5. FIG. 7 is a view showing the stator core 1 of the second embodiment during press working. In addition, for the components having the same effects as those shown in FIGS. 1 to 4, the same reference numerals as those in FIGS. 1 to 4 are given, and the description is omitted.

[0020] As shown in FIGS. 5 to 7, the inner contact portions 20a, 20a... provided at the outer diameter side ends of the tooth portions 15 and the outer contact portions 21a, 21a... provided at the inner peripheral side of the outer core 7 are flat surfaces that are in surface contact with each other. Also, the inner contact portion 20a and the outer contact portion 21a are formed in the direction of a tangent line L to the outer peripheral surface of the outer core 7 through which the center line of the tooth portion 15 passes.

[0021] According to such a configuration, similar to the first embodiment, the positioning operation of the inner core 6 with respect to the outer core 7 becomes easy. Further, since the inner contact portion 20 and the outer contact portion 21 are flat surfaces, when the inner core 6 is disposed inside the outer core 7 and moved to the fitting position, it becomes easy to rotate.

[0022] 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.

Explanation of reference numerals

[0023] 1 ·· Stator core, 2 ·· Rotor, 3 ·· Bearing, 4 ·· Bracket, 5 ·· Cover, 6 ·· Inner core, 7 ·· Outer core, 8 ·· Bobbin, 9 ·· Coil, 10 ·· Shaft, 11 ·· Rotor core, 12 ·· Magnet, 15 ·· Tooth portion, 16 ·· Bridging portion, 20, 20a ·· Inner contact portion, 21, 21a ·· Outer contact portion, L ·· Tangent line.

Claims

1. A stator core having a two-part structure 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, the inner core and the outer core are joined by the contact between an outer contact portion formed on the inner circumference of the outer core and an inner contact portion formed on the outer diameter side end of each teeth portion, and the outer contact portion is an arcuate concave portion that is concave on the outer diameter side, and the inner contact portion is an arcuate convex portion that bulges on the outer diameter side and fits into the concave portion. A stator core characterized by this.

2. The arcuate radius of the outer contact portion and the inner contact portion is equal to or greater than the width of the teeth portion, and the arcuate center points of the outer contact portion and the inner contact portion are between the center point of the inner core and the outer diameter side end of the inner contact portion. The stator core according to claim 1, characterized by this.

3. A stator core having a two-part structure 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 in the radial direction and a bridging portion that connects the inner diameter side ends of the adjacent teeth portions in the circumferential direction, the inner core and the outer core are joined by the contact between an outer contact portion formed on the inner circumference of the outer core and an inner contact portion formed on the outer diameter side end of each teeth portion, and the outer contact portion and the inner contact portion are flat surfaces that are in surface contact with each other. A stator core characterized by this.

4. Each of the flat surfaces is formed in a tangential direction with respect to the outer peripheral surface of the outer core through which the center line of the teeth portion passes. The stator core according to claim 3, characterized by this.

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

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