JPS6223340A - Miniaturized motor - Google Patents

Abstract

PURPOSE:To prevent the undesirable spring back produced at the bent-up portion of an insulating core by composing the insulation core of metal foils clad inside the resin films. CONSTITUTION:An insulating core 1 is formed by bending up the bent-up portion 2 corresponding to the winding portion of the rotor winding at each pole. Here, the resin films 3 are clad with the metal foils 4 and laminated. Thus the undesirable opening to outside, i.e., the spring back 6 formerly produced in the insulating core, which has so far been formed of resin films only, is no more produced with the support of the plasticity of the metal foils 4.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention provides a compact motor, in particular an insulating core that covers the axial end face of a rotor core, by bonding metal foil and resin film together. The present invention relates to a small motor that suppresses undesired springback occurring at the bent portion of the insulating core.

[Prior art and problems to be solved by the invention]-C: When winding a rotor winding on a rotor core in the manufacturing process of a small motor, the rotor winding is coated at the corner of the rotor core. in case of damage.

The axial end face of the rotor core is covered with an insulating core. A resin film, such as a polyester film, is used as a material for forming the insulating core, and a mackerel-edge core in which a bent portion is formed by bending the resin film is often used. However, when using a thin resin film forming the insulating core, such as a thickness of 0.075 m/m to 0.08 m/m, the bent portion may cause springback, or As shown in Figure 2 (A), a phenomenon of opening outward may occur.

For example, a problem arises when the thickness is 0.125 m/w or less.

If the bent portion of the insulating core opens outward like a wing in this way, it becomes difficult to wind the rotor winding.

Therefore, conventionally, an insulating core was bonded to the 9-rotor core using an adhesive before winding was performed, but it is difficult to bond a thin insulating core to a rotor core that is covered with oil or the like. This was an obstacle in the mass production process.

[Means for solving problems]

The present invention aims to solve the above-mentioned problems, and therefore the small motor of the present invention is provided.

In a small motor that uses an insulating core molded into a shape having a bent portion using a resin film, the insulating core is configured to cover an end face in the axial direction of a nine-rotor iron core, wherein the insulating core is made of the resin film. It is characterized in that it is constructed by bonding a metal foil to the inside of the film, and prevents undesired springback that occurs at the bent portion due to the plasticity of the metal foil bonded to the inside of the insulating core. This will be explained below with reference to the drawings.

[Embodiment] FIG. 1 is a rear view of an embodiment of the insulating core in a small motor of the present invention, and FIG.
- An enlarged cross-sectional view of A'; FIG. 2 (B) shows another embodiment of A;
-A,' shows an enlarged cross-sectional view.

In the figure, 1 represents a bent portion of the insulating core 22, 3 represents a resin film, 4 represents a metal foil, 5 represents a resin coat, and 6 represents a springback (or a state in which springback occurs). ' The insulating core 1 of the embodiment shown in FIG. 1 is for a three-pole rotor, and bent portions 2 are formed by bending in correspondence to the portions around which the rotor windings are wound at each pole. There is. Then, the resin film 3 and the metal foil 4 are bonded and laminated. The laminated state is shown in FIGS. 2(A) and 2(CB), both of which are enlarged cross-sectional views taken along the line AA' in FIG. 1. That is, in the case shown in FIG. 2(A), the outer part of the insulating core 1 that contacts the nine rotor windings is made of resin film 3, and the inner part of the insulating core 1 that contacts the rotor core is made of gold JXF.
i4. Therefore, an undesired outward opening occurs in the insulating core, which was conventionally formed only by the resin film 3.

That is, the springback 6 is supported by the plasticity of the metal foil 4 and does not occur. In another embodiment shown in FIG. 2(B), a resin coat 5 is applied on a metal foil 4, and the resin film 3, the metal M4, and the resin coat 5 are three layers.

〔Effect of the invention〕

As explained above, according to the present invention, a rotor winding is wound around a rotor core of a small motor.

Conventionally, a process of bonding the insulating core to the rotor core was required to avoid springback that occurs at the bent portion of the insulating core, but the plasticity of the metal foil solves the problem of springback. For this reason, the above-mentioned adhesion process becomes unnecessary, and one bottleneck in the mass production process can be solved. Further, according to the present invention, &f! Since the bending angle at the bent portion of the I-edge core can be freely set, the bent portion can be shaped as a fifted shape around the rotor core.

[Brief explanation of drawings]

FIG. 1 is a rear view of an embodiment of an insulating core in a small motor of the present invention, and FIG. 2(A) is an A of the embodiment shown in FIG.
- An enlarged cross-sectional view of A'; FIG. 2 (B) shows another embodiment of A;
-A' cross-sectional enlarged view is shown. In the figure, 1 represents an insulating core, 2 a bent portion, 3 a resin film, 4 a metal foil, 5 a resin coat, and 6 a spring bank.

Claims (1)

[Claims] In a small motor that uses an insulating core formed using a resin film into a shape having a bent part, the insulating core is configured to cover an end face in the axial direction of the rotor core. A small motor comprising a metal foil bonded to the inside of a film, and characterized in that undesirable springback occurring at the bent portion is prevented by the plasticity of the metal foil bonded to the inside of the insulating core.