JP2017011782A - Stator core, motor, and manufacturing method of stator core - Google Patents

Abstract

A stator core, a motor, and a stator core manufacturing method capable of increasing the torque of a motor with a small diameter.
A stator core includes an annular base portion and a pole tooth portion attached to the base portion. And the pole tooth part 12 is comprised with the base part 11, and is provided with the annular | circular shaped base part 12a attached to the base part 11, and several polar teeth 12b extended from the base part 12a, It is characterized by the above-mentioned. To do.
[Selection] Figure 2

Description

  The present invention relates to a stator core, a motor using the stator core, and a method for manufacturing the stator core.

  For example, small stepping motors used in digital cameras, digital video cameras, FDD, ODD, and the like are wound around a rotor having a permanent magnet on the outer periphery of a rotating shaft, a stator core disposed on the outer periphery of the rotor, and a stator core. And a coil. And the stator core of them, for example, as shown in the left figure of FIG. 6, punches the center part of the disk-shaped plate material made of magnetic metal into a predetermined shape, and then, after the punching process, as shown in the right figure of FIG. A plurality of pole teeth 112b are formed by drawing or cutting and bending the remaining portion. As described above, in the conventional stator core 110, the plurality of pole teeth 112b are erected on the inner periphery of the annular base 111a, and the base 111a and the plurality of pole teeth 112b are structurally integrated.

JP 2008-35649 A

  Here, when increasing the torque of the stepping motor with a small diameter, it is necessary to lengthen the motor shape in the axial direction of the rotating shaft, and accordingly, it is necessary to lengthen the pole teeth of the stator core. However, many of the stator cores used in small stepping motors have pole teeth 112b formed by standing up the remaining portion when the center portion of the disk-shaped plate material is punched as shown in FIG. Yes. For this reason, for example, in the stator core 110 shown in the figure, the pole teeth 112b cannot be formed with a length equal to or longer than the radius of the inner periphery of the base 111a, and the length of the pole teeth 112b that can be formed is limited. Further, in the case of the stator core 110, the smaller the outer diameter of the pedestal 111a, the shorter the length of the pole teeth 112b that can be formed.

  The present invention has been made in view of the above, and an object of the present invention is to provide a stator core capable of increasing the torque while maintaining a small diameter of the motor, a motor using the stator core, and a method of manufacturing the stator core.

  In order to solve the above-described problems and achieve the object, a stator core according to the present invention includes an annular base portion and a pole tooth portion attached to the base portion, and the pole tooth portion includes: It is comprised by the base part and another member, and is provided with the annular | circular shaped base part attached to the said base part, and several polar teeth extended from the said base part.

  In order to solve the above-described problems and achieve the object, a motor according to the present invention includes the stator core and a coil wound around the stator core, and pole teeth of pole teeth of a plurality of stator cores The coil is wound around the outer periphery of the meshed pole teeth.

  In order to solve the above-described problems and achieve the object, a stator core manufacturing method according to the present invention includes a base part manufacturing step of processing a plate material to manufacture an annular base portion, and processing the plate material. Forming a base portion extending in a predetermined direction and a plurality of pole teeth extending in a direction perpendicular to the extension direction of the base portion, and bending the base portion in an annular shape so that the plurality of pole teeth face each other, The method includes a pole tooth part manufacturing step for manufacturing a tooth part, and an attaching step for attaching the pole tooth part to the base part.

  According to the present invention, since the base portion and the pole tooth portion of the stator core are formed of different members, the length of the pole teeth that can be formed is not restricted as in the prior art, so the pole teeth are formed longer. As a result, the torque of the motor can be increased while maintaining a small diameter.

FIG. 1 is a perspective view showing a configuration of a stator core according to an embodiment of the present invention. FIG. 2 is an exploded perspective view showing configurations of a base portion and pole tooth portions of the stator core according to the embodiment of the present invention. FIG. 3 is a diagram illustrating an example of a pole tooth manufacturing step in the stator core manufacturing method according to the embodiment of the present invention. FIG. 4 is a perspective view showing a state in which a plurality of stator cores according to the embodiment of the present invention are combined. FIG. 5 is a perspective view showing a stepping motor using the stator core according to the embodiment of the present invention. FIG. 6 is a diagram illustrating an example of a method for manufacturing a stator core in the prior art.

  A stator core according to an embodiment of the present invention, a motor using the stator core, and a method for manufacturing the stator core will be described with reference to FIGS. In addition, this invention is not limited to the following embodiment. In addition, constituent elements in the following embodiments include those that can be easily replaced by those skilled in the art or those that are substantially the same.

  The stator core according to the embodiment of the present invention is used for a small stepping motor (hereinafter simply referred to as a motor) used in, for example, a digital camera, a digital video camera, an FDD, an ODD, and the like. As shown in FIG. 1, the stator core 10 includes a base portion 11 and a pole tooth portion 12 attached to the base portion 11. Moreover, the base part 11 and the pole tooth part 12 of the stator core 10 are comprised by another member as shown in FIG. 2, and after producing the base part 11 and the pole tooth part 12 in a separate process, as will be described later. The stator core 10 is obtained by combining the two.

  As shown in FIG. 2, the base portion 11 includes an annular pedestal 11 a and a plurality of protruding portions 11 b for attaching the pole tooth portion 12 to the inner periphery of the annular ring. The base portion 11 is made of a magnetic metal, and can be manufactured, for example, by punching a plate material made of a magnetic metal into a shape shown in FIG.

  As shown in FIG. 2, the pole tooth portion 12 includes an annular base portion 12 a, a plurality of pole teeth 12 b extending from the base portion 12 a, a plurality of notch portions 12 c engaged with the protruding portions 11 b of the base portion 11, It has. As shown in the figure, a plurality of pole teeth 12b are formed at a predetermined length in the axial direction of the rotating shaft 50 (see FIG. 5) of the motor 1 in which the stator core 10 is used, in the upper part of the base 12a. Further, as shown in the figure, the plurality of pole teeth 12b are formed on the upper portion of the annular base 12a so as to face each other at equal intervals in the circumferential direction of the ring.

  For example, as shown in FIG. 3, the pole tooth portion 12 is formed by punching a plate made of magnetic metal into a comb shape and bending the punched plate into an annular shape (cylindrical shape). Can be produced. And the stator core 10 as shown in FIG. 1 is producible by attaching the notch part 12c of the pole tooth part 12 to the protrusion part 11b provided in the inner periphery of the base part 11, and fixing both.

  In the stator core 10 according to the embodiment of the present invention having the above-described configuration, the length of the pole teeth 12b that can be formed by forming the base portion 11 and the pole tooth portion 12 of the stator core 10 as separate members, respectively. There are no conventional restrictions. That is, as shown in FIG. 6, in the conventional stator core 110, since the pedestal 111a and the pole teeth 112b are integrally formed, the pole teeth 112b are formed to have a length longer than the radius of the inner periphery of the pedestal 111a. However, the stator core 10 according to the embodiment of the present invention can form the pole teeth 12b long without such restrictions. Therefore, by using such a stator core 10, it is possible to increase the torque while maintaining a small diameter of the motor as compared with the conventional case.

  Here, when the stator core 10 according to the embodiment of the present invention is used in a motor (stepping motor), a plurality of stator cores 10 are used in combination as shown in FIG. That is, as shown in the figure, the pole teeth 12b of the pole tooth portions 12 of a plurality (four in this case) of the stator core 10 are engaged with each other. Then, as shown in FIG. 5, the coil 20 is wound around the outer periphery of the meshed pole teeth 12 b and incorporated in the motor 1.

  In FIG. 5, the stator core 10, the coil 20 wound around the outer periphery of the stator core 10, the mounting plate 30 used as a fixing plate when the motor 1 is mounted on a device, and the radial mounted on the mounting plate 30 The motor 1 including the bearing 40, the rotating shaft 50, the terminal pin 60 that supplies power to the coil 20, and the terminal block 70 that supports the terminal pin 60 is illustrated, but the motor on which the stator core 10 is mounted. The configuration is not limited to this. Further, in the same figure, the illustration of the rotor provided inside the stator core 10 is omitted.

  Hereinafter, the manufacturing method of the stator core 10 which concerns on embodiment of this invention is demonstrated. The manufacturing method of the stator core 10 includes a base part manufacturing step, a pole tooth part manufacturing step, and an attachment step.

  First, in the base portion manufacturing step, an annular base portion 11 (see FIG. 2) is manufactured by punching a plate material made of magnetic metal or the like. That is, in the base portion manufacturing step, the plate material is punched into an annular shape so that a plurality of protruding portions 11b are formed on the inner periphery of the annular shape.

  Next, in the pole tooth portion production step, a plate material made of a magnetic metal or the like is punched into a comb shape, and the punched plate material is bent into an annular shape to thereby form a pole tooth portion 12 having a plurality of pole teeth 12b. (See FIG. 3). That is, in the pole tooth portion production step, a base material 12a that extends linearly in a predetermined direction and a plurality of pole teeth 12b that extend in a direction orthogonal to the extension direction of the base portion 12a are formed by processing the plate material. And the pole tooth part 12 is produced by bending the base 12a into an annular shape so that the plurality of pole teeth 12b face each other.

  Finally, in the attachment step, the pole tooth portion 12 is attached to the inner periphery of the base portion 11 by engaging the notch portion 12 c of the pole tooth portion 12 with the protruding portion 11 b of the base portion 11. Thereby, the stator core 10 as shown in FIG. 1 can be manufactured.

  The stator core, the motor, and the method for manufacturing the stator core according to the present invention have been specifically described above by the embodiments for carrying out the invention. However, the gist of the present invention is not limited to these descriptions, and the claims It should be interpreted broadly based on the scope description. Needless to say, various changes and modifications based on these descriptions are also included in the spirit of the present invention.

DESCRIPTION OF SYMBOLS 1 Motor 10,110 Stator core 11 Base part 11a, 111a Base 11b Protrusion part 12 Polar tooth part 12a Base part 12b, 112b Polar tooth 12c Notch part 20 Coil 30 Mounting plate 40 Radial bearing 50 Rotary shaft 60 Terminal pin 70 Terminal block

Claims (3)

An annular base,
A pole tooth portion attached to the base portion,
The pole tooth portion is constituted by a member separate from the base portion, and includes a ring-shaped base portion attached to the base portion, and a plurality of pole teeth extending from the base portion. The stator core according to claim 1;
A coil wound around the stator core,
A motor in which pole teeth of pole teeth of a plurality of stator cores are engaged with each other, and the coil is wound around an outer periphery of the engaged pole teeth. A base part production step for producing an annular base part by processing a plate material;
By processing the plate material, a base portion extending in a predetermined direction and a plurality of pole teeth extending in a direction perpendicular to the extension direction of the base portion are formed, and the base portion is formed in an annular shape so that the plurality of pole teeth face each other. By bending, the pole tooth preparation step for preparing the pole tooth part,
An attaching step for attaching the pole tooth portion to the base portion;
A stator core manufacturing method comprising:

Images