JPS6125349Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to the structure of a rotor for a coreless armature, in which connecting grooves 2 are recessed in the outer peripheral end of a commutator plate 1 formed into a flat plate, and a cylindrical coil 3 is The drawn out connection portion 4 is bent into a substantially U-shape, the commutator plate 1 is arranged around the inner periphery of the cylindrical coil 3, the connection portion 4 bent into a substantially U-shape is fitted into the connection portion matching groove 2, and this connection is performed. This relates to the structure of a rotor of a coreless armature in which a solder layer 5 is applied between a portion 4 and a connection groove 2.

Regarding the rotor of this type of iron core type armature,
Conventionally, the commutator plate 1 and the cylindrical coil 3 were connected in the following manner. That is, a commutator plate 1 having a shaft 6 is formed into a disk shape, commutator segments 7 are radially applied to the commutator plate 1 using copper foil, etc., and wiring portions are formed on the commutator segment 7 portions as shown in FIG. A matching groove 2 is provided. 8 in FIG. 1 is a commutator. Further, the connection portion 4 led out from the cylindrical coil 3 is bent inside the cylindrical coil 3 as shown in FIG. Next, the commutator plate 1 is inserted into the cylindrical coil 3, and the connection part 4 of the cylindrical coil 3 is fitted into the connection groove 2 of the commutator plate 1 as shown in FIG. 3a.
Solder is applied between the connection groove 2 and the connection part 4, and a solder layer 5 is applied as shown in FIG. 3b.
However, in this case, the wire connection portion 4 is bent downward into the cylindrical coil 3, so the cut end of the wire connection portion 4 is likely to pierce the coil wire of the cylindrical coil 3, peeling off the insulation coating of the wire and causing layer yaw. Moreover, a large gap a is created between the connection part 4 and the inner surface of the connection part mating groove 2, which has the disadvantage that solder tends to flow out and it is difficult to apply solder.

The present invention has been made in view of the above points, and it is an object of the present invention to provide a rotor structure for an iron-core type armature that is free from the risk of solder outflow or layer yawt.

The present invention will be explained in detail below with reference to Examples. As the commutator plate 1, it is possible to use the one shown in FIG. 1 in which the commutator segment 7 portion is provided with connection grooves 2. Further, the cylindrical coil 3 is formed by winding a coil wire material, and a wire connection portion 4 is led out from the end thereof, in which the winding start and winding end portions of the coil wire material coincide with each other. This connection portion 4 is bent into a substantially U-shape inside the cylindrical coil 3 as shown in FIG. Therefore, when installing the commutator plate 1 into the cylindrical coil 3, first insert the commutator plate 1 into the cylindrical coil 3 as shown in FIG. The connecting portion 4 of the cylindrical coil 3, which is bent into a substantially U-shape, is fitted into the cylindrical coil 2. At this time, the elasticity of the U-shaped connecting portion 4 bent into a substantially U-shape prevents the tip from coming into elastic contact with the inner surface of the connecting portion mating groove 2, thereby creating a gap between the connecting portion 4 and the connecting portion mating groove 2. Prevented. Next, as shown in FIG. 5B, solder is deposited between the wire connection portion 4 and the wire connection portion alignment groove 2 to form a solder layer 5. At this time, as there is no gap between the connection part 4 and the connection groove 2 as described above, there is no risk of solder flowing out, and the solder is inside the connection part 4 which is bent into a substantially U-shape. This allows for good solder application. In this way, the cylindrical coil 3 and the commutator plate 1 are electrically coupled, and furthermore, as shown in FIG.
As shown in FIG.
The commutator plate 1 is fixed to the cylindrical coil 3 to form a rotor of a coreless armature.

As described above, in the present invention, the wire connection portion drawn out from the cylindrical coil is bent into a substantially U-shape and this wire connection portion is fitted into the wire connection portion fitting groove of the commutator. The tip does not face the cylindrical coil, there is no risk of breaking the insulation coating of the coil wire of the cylindrical coil at the tip of the connection part, and it can prevent layer shorts from occurring, and moreover, it is approximately U. Due to the elasticity of the U-shaped wire connection part, the tip of the wire connection part elastically contacts the inner surface of the connection part matching groove, preventing a gap from forming between the connection part and the connection part matching groove, and when soldering is performed. There is no risk of solder flowing out from this gap, and the solder is received inside the connection portion bent into a substantially U-shape, allowing for good solder application.

[Brief explanation of the drawing]

Fig. 1 is a perspective view of a commutator plate used in an embodiment of the present invention and a conventional example, Fig. 2 is a vertical cross-sectional view of a cylindrical coil of a conventional example, Fig.
Figure b is an enlarged view of a part of Figure 3 a, Figure 4 is a vertical cross-sectional view of a cylindrical coil according to an embodiment of the present invention, Figure 5 a is a longitudinal cross-sectional view of an embodiment of the present invention, Figure 5 b is Figure 5a
It is an enlarged view of a part of. 1 is a commutator plate, 2 is a connection groove, 3 is a cylindrical coil, 4 is a connection portion, and 5 is a solder layer.

Claims (1)

[Scope of utility model registration request] A connection groove is formed in the outer peripheral end of the flat commutator plate, the connection part pulled out from the cylindrical coil is bent into a substantially U shape, and the commutator plate is arranged on the inner circumference of the cylindrical coil. A structure of a rotor of a ironless core type armature in which a U-shaped connecting part is fitted into a connecting part matching groove, and a solder layer is applied between the wiring part and the wiring part matching groove.