JPH01148047A - Manufacture of core for coil of motor - Google Patents

Abstract

PURPOSE:To effect mass production employing a progressive press, by a method wherein an electric wire, having a circular section, is bent so as to have the shape of rectangular wave, in which horizontal parts and vertical parts are continued alternately, and the vertical parts are pressed to flat surfaces while the wire is cut at the central part of the flat surfaces. CONSTITUTION:A wire material 1, having a circular section, is pulled out of a roll and is bent so as to have the shape of a rectangular wave, in which horizontal parts 11 and vertical parts 12, which are provided with the same length, are continued alternately. Subsequently, the vertical parts 12 are pressed to form flat surfaces 12a, then, up-and-down holes 2 are bored. Next, the wire is cut along an intermediate line 3 to form the core of coil having U-shape, which is provided with connecting surfaces 121a readily connected to a stator. A coil bobbin 4 is attached to the horizontal part 11 and a motor driving coil 5 is wound therearound, then, the coil 5 is connected to a stator utilizing the holes 2. According to this method, the core may be worked continuously by a progressive press whereby productivity may be improved and the waste of the wire material may be prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a method of manufacturing a coil core for a motor.

(Prior Art) Traditionally, coil cores have been manufactured by crushing both ends of a single bar in the thickness direction to form a flat surface, or by forming a coil core into a flat surface in advance.
Both ends of the book bar are compressed in the axial direction to increase its diameter, and then both ends are crushed in the thickness direction to form a wide flat surface, and the stator is connected to this flat surface. (Japanese Unexamined Patent Publication No. 61-8504)
No. 8, No. 62-44050).

(Problems to be Solved by the Invention) However, this conventional process has a problem in manufacturing efficiency due to lack of manufacturing continuity, and improvements for mass production have been desired.

SUMMARY OF THE INVENTION An object of the present invention is to provide a method for manufacturing a coil core that enables continuous processing of the coil core, prevents waste of materials, and is effective in reducing manufacturing costs through mass production.

(Means for Solving the Problems) The present invention is characterized by bending a wire rod having a circular cross-sectional shape into a rectangular wave shape in which horizontal portions and vertical portions are successively positioned alternately, and then The wavy vertical portion is pressed into a flat surface, and then cut approximately at the center of the flat surface.

(Example) Hereinafter, an example of the present invention will be described with reference to the drawings. In FIG. 1, one end of a wire 1 having a circular cross-sectional shape is drawn out, and the wire is bent into a rectangular wave shape with horizontal portions 11 and vertical portions 12 alternately continuous as shown in FIG.

In the wire 1 bent into a rectangular wave shape, the horizontal portions 11 have the same length, and the vertical portions 12 have the same length.

Thereafter, a progressive multi-stage press process is performed to form a flat surface 12a sequentially from the rectangular wave-shaped vertical portion 12 located at the front, as shown in the third figure.

Next, as shown in the fourth figure, holes 2.degree. 2 are sequentially bored at two locations above and below the flat surface 12a that is fed in sequentially.

Furthermore, as shown in FIG. 5, a cut is made along line 3 between the holes 2, 2 on the flat surface.

Therefore, in the wire rod 1, the flat surface 12a as shown in the sixth figure is divided into two upper and lower parts, each forming a flat connecting surface 121a, 121a that can be easily connected to a stator (not shown).

The present invention thus forms a mouth-shaped coil core with bent ends.

The coil core completed by the above steps has a known coil bobbin 4 (
For example, see Utility Model Application Publication No. 62-2372).
The motor drive coil 5 is wound around the hole 2 of the connecting surface 121a.
The stator (not shown) is connected using the . Of course, the step of drilling holes 2, 2 is not necessary for the coil core to which the stator is spot-welded to the connecting surface 121a.

(Effects of the Invention) Since the present invention has the above configuration, there is no wastage of materials, continuous processing is easy by applying a progressive press machine, and it is suitable for mass production and reduces manufacturing costs. It is extremely effective.

[Brief explanation of the drawing]

The drawings show the processing steps according to the present invention. Fig. 1 is a front view of the wire being pulled out, Fig. 2 is a front view of the wire being bent into a rectangular wave shape, and Fig. 3 is a front view of the wire being bent into a rectangular wave shape. Fig. 4 is a front view of the flat surface with a hole drilled therein, Fig. 5 is a front view of the flat surface cut into two, and Fig. FIG. 6 is a front view of the completed coil core, and FIG. 7 is a front view showing the drive coil wound around the coil core. DESCRIPTION OF SYMBOLS 1...Wire rod, 11...Horizontal portion, 12.Fist/vertical portion, 12a...Flat surface. that's all

Claims (1)

[Claims] A wire rod having a circular cross-sectional shape is bent into a rectangular wave shape in which horizontal portions and vertical portions are successively positioned alternately, and then the vertical portions of the rectangular wave shape are pressed into a flat surface. and then cutting the coil core at approximately the center of the flat surface.