JPS6322645Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a flat, aligned-wound coil that is arranged to face a disc-shaped magnetic field, and aims to improve the dimensional accuracy of the coil outer shape and the generation efficiency of electromagnetic force.

There is a demand for smaller and thinner devices such as VTRs and floppies, and flat coils are also required for the flat motors and actuators used there. This type of coil has a triangular or trapezoidal outer shape and is arranged so that the isosceles flux (direction of current) of the coil is perpendicular to the magnetic field facing the coil. The isosceles are the parts indicated by symbols A and B in FIG. In a coil arranged as described above, the isosceles portion affects the efficiency of generating electromagnetic force, and it is desirable that the wire flux is linear.

To summarize the qualities required for a coil, (1) If the specifications are the same, the outer diameter should be as small as possible, (2) The dimensional accuracy of the outer shape of the coil should be good (the coil should be finished according to the drawing), (3) ) The wire bundles of isosceles A and B are linear.Of the above three items, (1) and (2) can be solved to some extent by using aligned winding. In order to realize (3), the following conditions are required in addition to aligned winding.

Generally, a coil is wound from the inner layer to the outer layer with the wires crossing each other. In aligned winding, the wires in each layer are aligned, but there are also intersections where the wires overlap the wires in some of the layers. In other words, if the innermost layer is the first layer, after wrapping the first layer, fold it back from the same side and make the second layer.
When moving to the layer and performing multilayer winding in the same way, the line of the second layer is located between the line of the first layer and the line (the fifth layer).
), when winding in alignment, from the end of the nth layer (n+
1) At the point where the layer moves to the beginning of winding, that is, at the turn-back position, the winding spiral direction of the wire changes, and each time it is wound, a part of the wire runs over the lower layer wire and crosses occur, so the wire diameter is set to d. Then, the winding thickness at some of the running points will be 2d. On the other hand, most of the other wires are wound in a close-packed state in which the upper layer is located between the valleys of the lower wire, so they are wound to a thickness of 2dcos30° (strictly speaking, d+dcos30°).

From this, it is obvious that the coil bulges at the position where the wires intersect (ride on each other), and the position of this bulge is not constant and disturbs the winding layer.

In other words, as a necessary condition to satisfy (3), intersection (overboard) points must be concentrated in line bundle parts other than isosceles parts. When the landing position comes to the isosceles
This is because the winding thickness of 2d increases the winding thickness even with the same n layer and bulges outward accordingly, making it impossible to form a straight line. A self-welding wire having a structure as shown in FIG. 4 is suitable for the wire used for this purpose, and by bonding the wound coil, a coil with good dimensional accuracy that does not cause deformation can be obtained. This self-fusing wire 1 has a structure in which a fusing film 7 is applied to the outer periphery of a core wire 5 via an insulating film 6, and the contact films can be directly bonded to each other by reactivation treatment such as heating or solvent coating. In order to make the wire smaller, it is more advantageous to omit the regular bobbin and use a so-called bobbinless coil, but in this case, self-fusion wire is also suitable.

To wind the coils in an aligned manner, as shown in Figure 5, there should be approximately d/2 between the end of the winding of the nth layer and the winding frame.
A gap g is required. This gap is equal sides A and B
By providing it at the top or bottom of a point other than the intersection point, it is possible to concentrate it on any side other than the intersection (ride-up) point. To provide the gap g at the top or bottom, for example, a bobbin having a collar whose winding width can be adjusted may be used, and the spacing between the ribs may be set to a width such that the intersection occurs at the top or bottom.

Therefore, the purpose of the present invention is to create two
In a coil having a triangular or trapezoidal shape having equilateral sides A and B, the intersection or running-up point of the wires in each winding layer is arranged at the top or bottom of the isosceles A and B, so that the isosceles A of the coil body 4 is , B is achieved by an aligned winding coil characterized in that the wire bundles of portions B are formed in a straight line.

More specifically, the coil is formed into an isosceles trapezoidal shape using self-fused wire, and the intersection points of each winding layer, that is, the running points are concentrated at the top. During lamination, the self-fusing wire 1 of the outer layer is rolled up so as to settle in the valley 2 between the wires 1' and 1'' of the inner layer, and as shown in the figure, only the intersection (run-up point) 3 is connected to the top of the coil body 4. This increases the thickness at the top, but keeps the sides equilateral and straight.

To manufacture the proposed coil with this configuration, the first layer of windings should be placed at the top (or bottom) as shown in Figure 1.
After winding the entire width of the first layer, it is rolled up to the second layer, but in that case, the line of the first layer may run over the top (or bottom) due to the setting of the brim spacing, etc. The 4th layer...n... is wound in the same manner up to the outermost layer. In this manner, the main body 4 is processed by hot air fusing, electrical heating, solvent coating, etc., and the entire body is integrated with the fusing coating 7 to complete the process. The thickness of the completed coil winding is d+d(n-1)
The cos becomes 30°.

Since the present invention has the above configuration, it exhibits the following features and provides a high-performance aligned winding coil.

(1) Since the coil is manufactured in an orderly and close-packed manner compared to random winding, the finished dimensions are smaller, the wire area ratio is good, and the magnetization efficiency is high.

(2) Accurately fits within limited dimensions.

(3) Since the crossing (riding over) portions are concentrated at the bottom or top of the coil body 4, the characteristics of the coil are not adversely affected.

(4) In the case of a triangular coil, the electrical element is mainly the wire bundle on the hypotenuse, but in general, in an aligned winding coil, the crossing (riding) part extends on the hypotenuse.
As a result, the width of the wire bundle must be widened, but in the present invention, the crossing (riding) portions are concentrated at the bottom or top, so the oblique side is kept straight and dimensional accuracy is improved. The isosceles portion of the coil body 4 is finished with the same precision and is symmetrical, so that the balance of current density is particularly improved.

[Brief explanation of the drawing]

The drawings show an embodiment of the aligned winding coil according to the present invention, and FIG. 1 is a front view, FIG. 2 is an enlarged plan view showing the winding state, FIG. 3 is a perspective view of the same, and FIG.
The figure is a perspective view of a part of the wire rod, and FIG. 5 is an explanatory diagram of the winding state. 1...Self-fused wire, 2...Trough, 3...Intersection, 4...Coil body.

Claims (1)

[Scope of utility model registration request] In a triangular or trapezoidal shaped coil with isosceles A and B using self-fused wire, the intersection or running point of the wire in each winding layer is defined as isosceles A and B.
An aligned winding coil characterized in that the wire bundle at the isosceles A and B portions of the coil body 4 is formed in a straight line by being disposed at the top or bottom other than B.