JPS5989561A - Coreless armature and mold therefor - Google Patents

Abstract

PURPOSE:To prevent electrical mechanical unbalances due to the layer shortcircuit and the displacement of a coil by providing an interchangeability at the completed armature by constantly positioning the coil. CONSTITUTION:A coil 11 and a commutator 12 are associated, and inserted between a top force 16 and a bottom force 17. In other words, when a reference coil is matched to a mark and the coil 11 is inserted into a coil containing chamber 18, the commutator 12 is similarly contained in a commutator containing chamber 19. As a result, a recess 20 is engaged with a projection 14, the recess and the projection of the outer periphery of the coil 11 are engaged with the projection of the chamber 18 to effectively position the angular direction of the coil 11 and the commutator 12 to be secured to the bottom force 17. When the top force 16 is covered on the bottom force 17 and synthetic resin is filled from an inlet 16a, the coil 11 and the commutator 12 are integrated with the synthetic resin.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a coreless armature of a commutator motor used in household electrical appliances and the like, and a mold for molding the armature.

The structure of the conventional example and its problems As shown in Fig. 1, the conventional iron-free armature is made by first welding insulated self-welding wires wound in a ring shape to form a disk-shaped coil 1. Then, the conocoil is connected to a commutator 2 located in the center of the disk shape using a connecting wire 3. Then, these are put into a mold and made of synthetic resin 4 to form a coil 1 and a commutator 2.
The iron core armature shown in FIGS. 2 and 3 is one in which the connection wire 3 is integrally molded.

When the outer circumferential shape of the coil 1 is circular as described above, it is easy to manufacture a mold for molding it. However, since each group of coils 1 and commutator 2 are connected only by connection wires 3 with weak mechanical strength, there is no angular positioning of the coils 1 and commutator 2. Because the positions of the motors are not constant, when assembling a large number of motors, it is necessary to adjust the positions of the magnetic poles and brushes to suit each 31-inch armature, and each armature in a large number of completed motors is completely compatible. There was no sex.

Furthermore, as described above, when molding the coil 1, commutator 2, and connection wire 3 from synthetic resin, the coil 1 is fused in advance.
The adhesion between the wires deteriorated due to the heat and pressure during molding, causing the coil 1 to move in the radial direction and creating frictional force between the wires, causing layer shorts and misalignment of the single coil.

OBJECTS OF THE INVENTION The purpose of the present invention is to make the completed armature compatible by making the position of the coil constant, and to prevent electrical and mechanical imbalances caused by layer shorts and coil positional deviations.

Elaboration of the Invention The present invention enables positioning in the angular direction by providing one or more concave portions or convex portions on the outer peripheral surface of the coil group, which is formed by integrally molding a plurality of coil groups and a commutator connected thereto using synthetic resin. It's a social thing.

The present invention also provides a method for forming a commutator with a protrusion □ or a recess that engages with a concave or convex portion of the coil group on one side of a pair of molds in which the coil group and the commutator connected thereto are integrally molded from synthetic resin. A recess for positioning in the angular direction is formed.

DESCRIPTION OF THE EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. 4 to 11 of the drawings. Reference numeral 11 denotes a disc-shaped coil consisting of a plurality of coil groups, which is formed by winding an insulated self-welding wire to form a large number of concave portions 11a and convex portions 11b on the outer circumferential surface, and is fused and integrated in advance. A coil 110 is formed in advance.

12 is a commutator placed in the center of the coil 11, and has a convex portion 14 at the same angular position as the reference segment 13 to which the reference coil 11C is connected. A line 16 connects each group of coils 11 to the commutator 12, and connects each group of coils with reference to the reference coil 11c and the reference segment 13. A pair of upper and lower molds 16 and 17 shown in FIGS. 8 and 9 are composed of a commutator 12 connected via a connecting wire 16 to a coil 11 that has been integrated in advance by self-fusion as shown in FIG. The mold is made of resin and molded in one piece. That is, the upper mold 16 is formed with a synthetic resin injection port 16a. The lower mold 17 has the shape of the outer circumferential surface of the coil 11, that is, the recesses 11a that are continuous alternately.

Convex portions 18a and concave portions 18b that match the convex portions 11b are alternately and continuously formed on the inner peripheral surface of the coil housing chamber 18, and the convex portions 14 of the commutator 12 are formed on the bottom of the commutator housing chamber 19. A positioning recess 2o into which it fits is formed. Reference numeral 21 denotes a removable rod inserted into the axial hole 12a of the commutator 12 and erected at the center of the lower mold 17, with its upper end facing toward the injection port 16a. Reference numeral 22 denotes an alignment mark provided at the upper end of the coil storage chamber 18 in alignment with the four parts 2o.

In the above embodiment, the coil 11 and commutator 12 assembled in advance as shown in FIG.
Insert between 7. That is, when the reference coil 11C is aligned with the mark 22 and the coil 11 is placed in the coil storage chamber 18, the commutator 12 enters the commutator storage chamber 19 in the same way.
As a result, the concave portion 20 engages with the convex portion 14 and the coil 1
The concave portion 11 & the convex portion 11b on the outer periphery of the coil housing chamber 18
7 to securely connect the coil 11 and commutator 12 by engaging with the convex portion 1B&
It can be fixed to the lower mold 17 by aligning the position in the angular direction. Then, by inserting the rod 21 into the axial hole 12a of the commutator 12, placing the upper mold 16 over the lower mold 1'7, and injecting the synthetic resin 23 from the injection port 16a, as shown in FIGS. 10 and 11. The coil 11 and commutator 12 are integrated with the synthetic resin 23 to complete the process. A recess 11 a' is formed on the outer peripheral surface of the coil 11.
, convex portions 11b' are formed alternately and continuously.

FIG. 12 shows another embodiment of the present invention, in which one recess 24 is provided on the outer peripheral surface of the coil 11 for positioning only in the angular direction, and the effect is the same as that of the above embodiment.

Effects of the Invention As described above, the present invention can ensure a constant position of the coil and commutator, prevent layer shorts in the wires of the coil due to heat and pressure during integral molding of the coil and commutator with synthetic resin, and improve electrical resistance. Mechanical balance can also be maintained. Further, due to the concave or convex portions on the outer circumferential surface of the coil, the amount of molding material can be reduced compared to the conventional method, and the heat dissipation surface is also increased, improving its effectiveness.

[Brief explanation of drawings]

Figure 1 is a top view of the conventional armature coil before molding;
The figure is a longitudinal cross-sectional view when integrated with synthetic resin, Fig. 3 is a top view of the same, Fig. 4 is a top view of the armature coil before molding according to an embodiment of the present invention, and Fig. 6 is a longitudinal cross-section of the same. 6 is a front view of the commutator, FIG. 7 is a bottom view of the commutator, FIG. 8 is a vertical cross-sectional view of a mold for forming an armature coil according to an embodiment of the present invention, and FIG. 9 is a front view of the commutator. FIG. 10 is a top view of the armature coil after molding of the present invention, FIG. 11 is a longitudinal cross-sectional view of the same, and FIG. 12 is the armature after molding according to another embodiment of the present invention. It is a top view of a coil. 11... River Coil, 11 a, 11 a' Old...
・Convex portion, 11b, 11b', 24... Concave portion, 12・
... Rectifier bearing 23 ... Synthetic resin, 16 ...
...Upper mold, 17...Lower mold, 18a...
...Convex portion, 18b...Concave portion, 20...
recess. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 1
Figure 2 Figure 3 303- Wisdom

Claims (1)

[Claims] (Li) A plurality of coils formed of insulated wires and a commutator connected to the coils are integrally molded from synthetic resin, and the outer peripheral surface of the molded coils is coated with the coils before molding. A coreless armature in which one or more convex portions or concave portions are formed to match the outer circumferential shape of the coil. The iron-core armature according to claim 1, in which convex portions and concave portions are formed alternately and continuously. (3) A plurality of coils and a commutator connected to the coils are integrated with a synthetic resin. It has an upper mold and a lower mold for molding, and one of the molds has a convex part or four parts that engage with a concave part or a convex part on the outer peripheral surface of the coil before and after molding, and further for positioning the commutator in the angular direction. A mold for a coreless armature with four parts.