JPS6243417B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a cylindrical coil for a small motor, which is suitable for example as a cylindrical coil for a small DC motor.

Conventionally, for example, a coreless motor of this type has a yoke 1 and a cylindrical permanent magnet 2 installed inside the yoke 1 at a distance from the inner peripheral surface of the yoke 1 using a synthetic resin 3, as shown in FIG. The upper end portion of the cylindrical coil 8 is connected to a shaft 5 which is integrally formed into a stator and which passes through the permanent magnet 2 via bearings 4 and is pivotally supported, and to a commutator plate 7 which is coupled with a metal boss 6 interposed therebetween. is fixed to form a rotor, and a brush plate 11 having a terminal 10 connected to a brush 9 is fixed to the open end of the yoke 1. In this case, the cylindrical coil 8 constituting the rotor is
As shown in FIGS. 4 and 3, a coil wire 8a having a circular cross section is used, and it is sequentially wound around the winding surface of the cylindrical coil 8 to form a chevron or diamond shape as shown in FIGS. 4A and 4B. It was formed by winding it around the winding surface of the cylindrical coil 8, or by winding it in a tapered shape around the winding surface of the cylindrical coil 8.

However, in this conventional cylindrical coil, once the wire diameter of the coil wire 8a is determined, the number of turns is limited in relation to the diameter of the cylindrical coil 8, making it difficult to improve characteristics such as motor torque and rotation speed. This made the motor design rigid, and the diameter of the strands had to be changed in order to improve the motor's characteristics. For example, coil wire 8
The wire diameter of a is set to d, and this is wound by the winding method shown in FIG. In this case, the number of turns N is N=π(D
+d) expressed by sinθ/d, number of turns N
Since the magnetic flux of the coil cylindrical body 8 is determined by , the torque, rotation speed, etc. of the motor are limited by the wire diameter d of the strands.

The present invention eliminates such conventional drawbacks, and by using a flat coil wire, the number of turns can be increased while maintaining a constant cross-sectional area of the coil wire, and various characteristics of the motor can be improved. The object of the present invention is to provide a cylindrical coil for a small motor, etc., which can improve the performance.

Hereinafter, one embodiment of the present invention will be explained with reference to the drawings. The drawings show a situation in which the present invention is applied to a cylindrical coil of a coreless motor. In Figs. (omitted) is a cylindrical coil disposed inside the coil wire 1.
2a is sequentially wound in accordance with the winding method shown in FIG. Coil wire 12a
has a flat rectangular cross section, and in this coil wire cross section, the width b, which is the thinner outer peripheral direction, is radially arranged on the winding peripheral surface of the cylindrical coil 12 relative to the longitudinal width ω, which is the diameter direction of the cylindrical coil 12. The coil wires 12 in the inner and outer layer coils 13 and 14 are arranged accordingly.
We are trying to increase the number of turns in a. In this case, since the coil wire 12a has a vertical width ω>width b, the number of turns of the coil wire 12a in the inner layer coil 13 is increased, and the outer layer coil 1
In No. 4, by significantly increasing the outer circumference of the inner layer coil 13, which is the winding surface of the wire 12a, it is possible to further increase the number of turns of the wire 12a in the outer layer coil 14, thereby improving various characteristics of the motor. becomes possible. Therefore, this coil wire 12a is produced by rolling a coil wire material having a circular cross section and selecting the desired cross-sectional shape.
The number of turns of the coil wire 12a can be changed as appropriate. Therefore, when the cross-sectional area of the coil wire is kept constant, if the width b is appropriately selected, it is possible to set the number of turns of the coil wire 12a that corresponds to the desired motor characteristics. Even if a large number of turns are required, so-called more aligned winding is possible. Further, although it is desirable that the present invention is applied mainly to a cylindrical coil of a motor, it may also be applied to a coil winding means in a relay, a ballast, etc. or a coil winding means having a shape other than a cylindrical shape. is also possible. In addition, in the figure, 15 is a commutator plate, 16 is a conductive foil of the commutator plate 15, and 17 is a shaft passing through the stator.

As described above, in the present invention, instead of the conventional coil wire having a circular cross section, a coil wire having a flat cross section and a vertical width larger than the horizontal width is wound, so that the cross section of the wire is formed into a rectangular shape. However, by winding the thinner side surfaces radially toward the winding surface, the number of turns of the coil wire can be increased due to the thinner width, thereby increasing the motor torque and rotation. Characteristics such as number can be improved. In addition, the present invention sets the predetermined number of turns used for desired motor characteristics even when the cross-sectional area of the wire is constant by appropriately selecting the cross-sectional shape of the coil wire within the range of vertical width>width. This has an advantageous effect on the design of the motor. In particular, this effect is of great benefit in that it solves the problem of conventional coil wire diameters determining the number of turns, which constrains motor characteristics and makes motor design rigid. be. Furthermore, there is an effect that the strength of the coil is large.

[Brief explanation of the drawing]

Fig. 1 is a simplified sectional view of a coreless motor, Fig. 2 is a simplified plan view of a conventional example, Fig. 3 is a perspective view of a conventional coil wire, and Fig. 4 A to C are windings of the coil wire. FIG. 5 is a perspective view showing an embodiment of the present invention, FIG. 6 is an enlarged perspective view of the main parts of the present invention, and FIG. 7 is a perspective view of a coil wire used in the present invention. , FIG. 8 is a simplified plan view of the present invention. 12... Cylindrical coil, 12a... Coil wire.

Claims (1)

[Claims] 1. In a cylindrical coil for a small motor, etc., a coil wire with a flat cross section is wound into a cylindrical shape to form a coil, and the shape of the coil wire is the same as the vertical width ω in the diameter direction of the coil and the outer circumferential direction. A cylindrical coil for a small motor, etc., characterized in that the relationship of width b is ω>b.