JPS605711Y2 - Electric motor - Google Patents

Description

[Detailed Description of the Invention] This invention relates to an electric motor such as an engine starting motor, and particularly to an improvement of its amateur core.

The starting motor will be explained below. A conventional electric motor of this type is constructed as shown in FIGS. 1 and 2.

That is, in FIGS. 1 and 2, 1 is a shaft of an engine starting motor, 2 is a commutator fitted to the shaft 1, 3 is an amateur core made of a laminated steel plate fitted to the shaft 1, and 4 is an amateur core. A slot provided on the circumference of 3 and having an opening 41 necessary for winding on the outer periphery; 5 a coil wound in the slot 4 and connected to the commutator 2 after winding; This end plate is provided on both sides of the armature core 3 to prevent grounding to the armature core 3, and has slots 61 of the same shape as the armature core 3, and is manufactured by punching out fiberboard, pressboard, or the like.

In the conventional device configured as described above, since the slot 4 has an opening 41 on the outer periphery, in order to prevent the coil 5 from floating after winding, the coil 5 is temporarily held with a jig or the like (not shown). It needed to be fixed.

Furthermore, in order to prevent the coils 5 from floating due to the centrifugal force generated when the armature core rotates, varnish treatment is applied, but if the varnish treatment is not uniform, some of the coils 5 may not be sufficiently fixed, resulting in a decrease in centrifugal force resistance. It was extremely unstable.

This invention provides an excellent amateur core that overcomes the drawbacks of these conventional ones.

An embodiment of this invention will be described below with reference to FIG.

That is, in FIG. 3, the end plate 6 is made of thermoplastic resin and has a slot 61 and a notch 62 on the outer periphery, and the tip of 7 is pressed against the notch 62 of the end plate 6, and the notch 62 is pushed and expanded. It is a heating element that is shaped into a tapered shape suitable for use.

In this structure, after the coil 5 is wound around the slot 4 of the armature core 3, the heating element 7 is pressed against the notch 62 of the end plate 9 to open the slot 61 of the end plate 6 to the slot opening size a. The coil 5 is deformed to the position indicated by the dashed line until it becomes smaller than the diameter of the coil 5.

Here, an example in which the end plate 6 is provided with a notch 62 is shown, but
As shown in FIG. 4, a protrusion 63 is provided on the outer peripheral surface of the end plate 6,
The heating member 7 may be used to heat and deform the slot to the position indicated by the dashed line so as to reduce the opening dimension a of the slot.

As mentioned above, the electric motor according to this invention is provided with an end plate made of thermoplastic resin having slots into which the coils are inserted, at the side ends of the armature core around which the coil is wound, and after the coil is wound. The characteristics are stabilized because the slot opening in the end plate is heated and deformed to become smaller than the diameter of the coil to prevent the coil from floating.

[Brief explanation of the drawing]

Fig. 1 is a front view showing a main part of a conventional electric motor of this type in cross section, Fig. 2 is a sectional view taken along line H-II in Fig. 1, and Fig. 3 shows an embodiment of this invention. FIG. 4 is a cross-sectional view taken at a position corresponding to the line -■, and is an explanatory view of the main parts showing another embodiment of this invention. In the figure, 1 is a shaft, 1 is a commutator, 3 is an armature core, 4 is a slot, 5 is an armature coil, 6 is an end plate, 61 is a slot, 62 is a notch, 63 is a protrusion, and 7 is a heating element.

Claims (1)

[Claims for Utility Model Registration] 1. An armature core around which a coil is wound, an end plate made of thermoplastic resin that is provided at the side end of the armature core and has a slot into which the coil is inserted; The slot opening of the electric motor is heated and deformed to become smaller than the diameter of the force coil. 2. The electric motor according to claim 1, wherein a notch is formed between the slots of the end plate, into which the heating body is pressed for thermal deformation. 3. The electric motor according to claim 1, wherein a projection is formed between the slots of the end plate, on which the heating body is pressed for thermal deformation.