JPS5863066A - Armature of dc motor - Google Patents

Abstract

PURPOSE:To shorten the length of a rotary shaft and to achieve compactness and light weight by a method wherein a coil at the region projected from the through hole of a core is flattened for eacy bend. CONSTITUTION:In an armature coil 27 used for an armature 21, a bend section 33 is flatly formed and twisting processing for the bend section 33 can easily be done with short length. After penetrating such the coil 27 into the through hole of a core 2, flattening processing is done by pressing the coil 27. Therefore, the succeeding twisting processing for the opposite ends 29, 29 of the coil 27 can easily be done with short length. As a result, the overall length L of a rotary shaft 4 can be shortened and the compactness and light weight of the armature 21 can be achieved.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an armature for a DC motor, and particularly to an armature for a DC motor for starting motion.

First, the conventional armatures of this type are shown in Figures 1 to 3.
This will be explained with the help of a diagram.

In Figures 1 and 2, the armature (1) of the DC motor for machine starting has an armature core (2), and the center hole (8) of the armature core (2) has a rotating shaft. (4) is inserted so that its both ends protrude from both ends of the center hole (8). A gear (5) is fitted to one end of the rotating shaft (4), and these cores (2) and the rotating shaft (4)
The shaft core is constructed by:

A plurality of through holes (6), (6) extending in the axial direction are bored in the outer peripheral part of the core (2) at intervals in the circumferential direction, and each through hole (6) is It is a long hole in the radial direction. A folded armature coil (1) consisting of one circuit of enamel-coated conductor wire as shown in Fig. 3a and b is inserted into each through-hole (6) after being covered with insulating paper (8). The coil (7) protrudes from both ends of the through hole (6). Both ends (91, (9) protruding from one end of the through hole (6) of the core (2) are enameled αα
After being peeled off and twisted, it is mechanically and electrically connected to the large diameter part of the commutator (b) mounted on the rotating shaft (4). In addition, the coil (7
) is also twisted.

The axial length C1,) of both ends (9), (o) and bent portion 08) of the coil (7) protruding from both ends of the through hole (6) of the core (2), CI, ) should be made as short as possible to reduce the size and weight of the armature (1). However, in the case of conventional coils, the coil (7) has a circular cross section. Therefore, a certain length was necessary.

The present invention has been made for the purpose of eliminating the drawbacks of the conventional motors and providing an armature for a DC motor that can be made smaller and lighter.

The coil in the area protruding from the through hole of the core is made flat to make it easier to bend.

The present invention will be explained below with reference to embodiments shown in the drawings. Note that the same components as those of the conventional device described above are denoted by the same reference numerals in one drawing, and the explanation thereof will be omitted.

The armature coil used in the armature @11 of the present invention is
As shown in FIGS. 4a and 4b, the bent portion is formed flat, and the twisting process of the bent portion shown in FIG. 5 can be easily performed with a short length. After such a coil is inserted into the through hole (6) of the core (2), it is pressed and flattened in the direction of the arrow, as shown in FIGS. 7a and 7b. Therefore, both ends of the subsequent coil phase - sa! The twisting process shown in FIG. 8 of 91 can be easily performed with a short length.

As a result, the total length (L) of the rotating shaft (4) shown in Fig. 5 can be made shorter than that of the conventional one, and the armature (211) can be made smaller and lighter. The commutator is not listed because it is a semi-finished product.

In the embodiment described above, the coil (
Although it has been described that the coil (b) is inserted through the core (b), the coil (b) may be fitted into a long groove formed on the curved surface of the core (2). In this case, not only the bent portion of the coil @7+ but also both ends (291, E) can be flattened in advance.

It goes without saying that the flattened shape includes elliptical shapes and other shapes.

As explained above, in the armature according to the present invention, since the exposed area of the coil is formed flat,
Because it is easy to twist, the length of the rotation::11 shaft can be made shorter than conventional ones, making it smaller and lighter, and also has the effect of saving material costs.

[Brief explanation of drawings]

Figure 1 is a side view of a conventional armature, Figure 2 is the ■- of Figure 1.
■A sectional view taken along the line, FIG. 3a is a normal drawing of the coil, FIG. 5 is a right side view of FIG. 6a, FIG. 4a is a front view of the coil used in the armature of the present invention, The figure is a right side view of Hi 4 Figure a, Figure 5 is a side view of the armature according to the present invention in a semi-finished state, and Figure 6 is a sectional view taken along the line ■-■ in Figure 5. FIG. 7a and FIG. 8 are side views showing the manufacturing process of the armature according to the present invention, respectively, and FIG.
■It is a cross-sectional view taken along a line. (1), +21+: Armature (2): Core (8
) Double rotation axis (6): Through hole (γ), (rotation))
: Coil agent Makoto Kuzuno - Figure 1

Claims (1)

[Claims] A rotating shaft is inserted into the center hole of the armature core, and a plurality of armature coils for each circuit are folded in half and inserted into a plurality of axial through holes drilled in the core, and one end of the through hole is inserted. In the armature of a DC motor in which both ends of the coil protruding from the rotary shaft are connected to a commutator mounted on the rotating shaft, the coil in a region protruding from the through hole is formed flat. Armature of a DC motor.