JPH065971B2 - 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 Patent Publication No. 78342, a structure in which patterned conductors are spirally formed on both surfaces of an insulating material by a technique such as etching or plating so that the patterns simply overlap each other on the front and back sides, and terminals are connected on the front and back sides. There is. In the conventional coil having the above structure, the thin coil in which the thickness of the insulating material and the patterned conductor is reduced to improve the conductor space factor and the coil efficiency is improved. However, when it is going to be formed, the reinforcing effect between the pattern conductors on the front and back sides is low, so the plane rigidity of the coil is extremely reduced, which makes it particularly difficult to handle in the manufacturing process. There is a drawback that it is difficult to manufacture a child 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 pole dimensions of the coil poles on the front and back surfaces of the insulating substrate are mutually changed so that the coil pole side of a small dimension is changed. On the surface of the above, a structure in which a reinforcing pattern conductor is provided so as to straddle a plurality of large-sized coil poles on the opposite surface side is provided, and even if the sheet coil is thin, the bending rigidity of the plane is increased and the manufacturability is improved. I planned it. The reinforcing pattern conductor enhances the plane rigidity between the opposing pattern conductor and the entire sheet surface. The present invention will be described below based on the embodiment shown in FIG. The stator coil of this embodiment forms the coil conductor by a chemical method. Spiral patterned conductors 1 and 2 are formed on both front and back surfaces of the thin insulating sheet 3 by etching or plating to form in-phase coil poles. Generally, when the patterned conductor is formed on both surfaces 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.
In the sheet-like coil based on such a configuration, in order to reduce the thickness of the coil, the insulating sheet 3 and the conductor are thinned to reduce the overall thickness of the coil and improve the space factor of the conductor.
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 coil of the present invention is characterized by a structure capable of maintaining sufficient plane rigidity even when it is made thin. In this embodiment, the pole areas of the front and back coil poles of the insulating sheet 3 are changed while maintaining symmetry with respect to the pole center line. The pattern conductor 1 of the coil pole on the front side and the pattern conductor 2 of the coil pole on the back side form a coil pole of the same phase and are connected in series with each other by the through-hole electrode 5 in the pole. The back side coil pole 2 has a shape extending to the inner radius position with respect to the front side coil pole 1 and has a wide pole area. An annular reinforcing pattern conductor 7 is provided on the inner peripheral edge of the first coil pole 1 . The second coil pole 2 on the back surface side is not provided with an annular reinforcing pattern conductor in order to maximize the pole area. The ring-shaped pattern conductor 7 is arranged at a position overlapping the plurality of second coil poles 2 . By providing the annular reinforcing pattern conductor 7, the sheet rigidity between the coil poles can be reinforced, and the plane rigidity of the entire sheet coil can be increased to significantly improve the productivity. Further, in this structure, since the front and back coil poles are symmetrical with respect to the pole center line and the center lines are aligned with each other, the distribution of the magnetic flux generated by energization becomes uniform without distortion. Therefore, torque fluctuations of the motor can be reduced. The reinforcing pattern conductor may be provided on the outermost peripheral edge of the coil outside the coil pole, or may be provided on both sides of the insulating sheet. Further, the shape may be a shape in which a part of the patterned conductor is lacking, instead of a perfect all-round type annular shape. 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 includes a stator coil for a cylindrical type motor. Also the seat is 1
The configuration may be one in which two or more sheets are stacked, instead of the single sheet configuration. According to the present invention, even when a thin insulating material or conductor is used, the planar rigidity of the coil can be easily increased, and therefore the coil can be manufactured at a low cost and easy to handle during manufacturing.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an embodiment of a stator coil of the present invention. [Explanation of Codes] 1 ... Coil pole on the front side, 2 ... Coil pole on the back side, 1 ... Patterned conductor on the front side, 2 ... Patterned conductor on the back side,
3 ... Insulating substrate, 7 ... Reinforcing patterned conductor.

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, a first patterned conductor disposed on the first surface side of the insulating substrate. And a first coil pole formed on the second surface side of the insulating substrate facing the first coil pole and formed of a second patterned conductor. A second coil pole having a narrower coil pole area, and a second coil pole facing the second surface side along the arrangement direction of the second coil pole across a plurality of poles of the first coil pole. 3. A stator coil comprising: 3) a patterned conductor.