JPH065970B2 - Stator coil - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a motor stator coil formed of a patterned conductor. 2. Description of the Related Art Conventionally, as a stator coil for a motor composed of a double-sided patterned conductor, for example, Japanese Patent Laid-Open No.
As disclosed in Japanese Laid-Open Patent Publication No. 78342, coils of the same phase are formed on both surfaces of an insulating material in a spiral shape by pattern conductors so that the patterns are simply overlapped with each other. There is a configuration in which terminals are connected. In the conventional coil having the above structure, in particular, a thin coil in which the insulating material and the patterned conductor are thinned to improve the conductor occupation rate and the coil efficiency is improved. When it is formed, the reinforcing effect between the pattern conductors on the front and back is low, and the planar rigidity of the coil is extremely reduced, making it difficult to handle especially in the manufacturing process. There is a drawback that it is difficult to manufacture a coil. It is an object of the present invention to provide a stator coil for a motor which eliminates the above-mentioned drawbacks of the prior art, is easy to manufacture, is low in cost, and has high mass productivity. In order to achieve the above object, in the stator coil of the present invention, the width dimensions of the patterned conductors of the coil poles to be overlapped on the front and back surfaces of the insulating substrate are mutually opposite. The structure is such that the wide patterned conductor extends over the narrow patterned conductor across a plurality of gaps, and the sheet-shaped coil is designed to enhance the bending rigidity of the plane and improve the productivity even when it is thin. The wide patterned conductor reinforces the plane rigidity of the gap portion between the narrow patterned conductors. The present invention will be described below based on the embodiment shown in FIG. In the stator coil of this embodiment, a coiled conductor is formed by a chemical method such as etching. Spiral patterned conductors are formed on both sides of the thin insulating sheet 3 so as to face each other to form in-phase coil poles 1 and 2 . In general, when the patterned conductor is formed on both sides of the insulating sheet 3, the resistance is low, the number of turns is large, and the coil pole area can be widened, so that the coil efficiency can be improved and a highly efficient motor can be configured. The connection between the poles becomes easy. Also, the coil output is stable because the coil pole shape is uniform and the pole arrangement can be performed with high precision. In the sheet-shaped coil based on such a configuration, the insulating sheet 3 and the conductor are thinned to reduce the overall thickness of the coil and improve the conductor space factor. However, the thinner the insulating sheet 3 and the conductor are, the lower the planar bending rigidity thereof becomes, and it becomes difficult to handle in manufacturing. The stator coil of the present invention is characterized by a structure capable of maintaining sufficient planar rigidity even when it is made thin. FIG. 1 is a diagram showing an embodiment of the stator coil of the present invention. In this embodiment, the width of the patterned conductor on the back surface (second surface) is made wider than that on the front surface (first figure) and the positions are shifted in parallel. That is, the coil pole on the back side
Pattern conductor width W ₂ of 2, patterned conductor width of the coil electrode ₁ surface W ₁ pattern conductor between two gaps and g ₁
Wider than the sum of double and the patterned conductor 2 on the back side
Are two gaps on the surface side and one patterned conductor 1
It is arranged in a position that sandwiches and. Further, the width W ₁ of the patterned conductor on the side surface is equal to the gap g ₂ between the patterned conductors on the back surface.
The patterned conductor 1 on the front side is disposed at a position across two adjacent patterned conductors on the back side, sandwiching the gap on the back side. Thus, the planar rigidity can be increased by forming the pattern conductors in the gap between the pattern conductors so as to reinforce each other on the front and back sides. The above embodiment is a structural example of a stator coil for a flat type axial gap type motor, but the scope of the present invention is not limited to this, and also includes a stator coil for a cylindrical type motor. Further, the sheet-shaped coil may have a structure in which a plurality of two or more sheets are stacked, instead of the one-sheet structure. Further, the pattern conductors may be displaced not only in parallel but in an oblique direction so that they intersect with each other. According to the present invention, even if a thin insulating material or a conductor is used, the planar rigidity of the coil can be easily increased, and the coil can be manufactured at a low cost because it is easy to handle during manufacturing.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a sectional view showing an embodiment of a stator coil of the present invention. DESCRIPTION OF SYMBOLS 1 ... Coil pole on front surface, 2 ... Coil pole on back surface, 1 ... Pattern conductor on front surface side, 2 ... Pattern conductor on back surface side, 3 ... Insulating substrate, W ₁ ... Conductor of pattern conductor on front surface side Width, W ₂ ... Conductor width of the pattern conductor on the back surface side, g ₁ ... Gap between pattern conductors on the front surface side, g ₂ ... Gap between pattern conductors on the back surface side.

Claims (1)

[Claims] 1. In a sheet-shaped stator coil having coil poles formed by spirally forming patterned conductors on both front and back surfaces of a thin insulating substrate, the first patterned conductors are arranged on the front surface side of the insulating substrate. And a first coil pole, which is arranged on the back surface side of the insulating substrate so as to face the first coil pole, has a conductor width wider than that of the first patterned conductor, and has a plurality of inter-conductor gaps. A second coil pole formed by having a second patterned conductor that is arranged so as to straddle a plurality of first patterned conductors, and a stator coil.