JPS5883550A - Motor - Google Patents

Abstract

PURPOSE:To facilitate the production of a housing, to reduce the size and weight of a motor and to improve the cooling effect of the motor by covering the end of a stator core at the side of at least one coil end covered with an insulating sheet with a housing formed of a strip steel plate. CONSTITUTION:A coil is contained through an insulating sheet in the slot of a stator core 2 formed by laminating thin iron plates, at least one side 4 of coil ends 4, 5 projected from both ends of the core 2 is covered and insulated with an insulating sheet 3 such as mica moisture tape or prepreg sheet. Upper and lower housings 8, 7 are mounted at both ends of the core 2, thereby supporting a rotational shaft 11 through a bearing metal 9 mounted on the housings 7, 8. In this case the housing 8 at the side of the coil end 4 covered with the sheet 3 is formed from a strip steel plate, and the housing 9 is formed in a cylindrical shape with a bottom.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to electric motors used in washing machines and the like, and particularly relates to improvements in the housing of the electric motor.

In conventional electric motors used in washing machines, etc., the stator coil cannot be exposed due to the structure of the washing machine, so either ends of the stator core are covered with a bottomed cylindrical housing, or Tree the stator! It was completely molded to cover the stator coil.

Recently, electric motors are desired to be small and lightweight, but since conventional electric motors use 71 uzings, which are cylindrical with a bottom, there is a limit to how much weight can be reduced.
The problem was that it was expensive.

The present invention has been made in view of the above-mentioned difficulties.
By completely insulating at least one end of the coil end with an insulating sheet, and by forming a housing that covers the end of the stator core insulated with the insulating sheet from a steel strip, the motor can be made smaller and lighter. The purpose is to reduce costs.

The present invention will be explained below based on embodiments shown in the drawings.

(υ is a stator, which consists of a stator core (2) formed by laminating thin steel plates in the axial direction for a predetermined length, and a stator core (
2) The coil is wound and housed in the slot with an insulating paper interposed therebetween.

(3) is an insulating sheet, and the coil end portion (
4) Coil end portion (4) at least one end of (5)
Cover and insulate. In this embodiment, only the coil end portion (4) at one end is covered with the insulating sheet (3), but the coil end portions f4+ +51 at both ends may be covered with the insulating sheet (3).

The insulating sheet (3) is a sheet made of prepreg material by heating a polyester nonwoven fabric impregnated with mica wet temperature tape or a thermosetting resin such as epoxy resin to semi-cure the resin. , as shown in Figure 3 fAl, a circular insulation sheet (3 m) cut into a circular shape,
A rectangular insulating sheet (sb) cut into rectangles as shown in FIG. 3 fBl may be used.

Annular insulation sheet (roa) and rectangular insulation sheet (3b)
A plurality of notches (6) are provided in each of the coils so that the coil can be well coated along the coil end portion (4).

To cover and adhere the coil end portion (4) with the insulating sheet (3), as shown in Fig. 2, the insulating sheet (3) is placed on the iron core (2) in which the coil is housed, and the coil is The coil end portion (4) is closely adhered from above along the outer edge of the coil end portion (4) to cover and insulate the entire coil end portion (4) as shown in FIG.

When the prepreg material described above is used for the insulating sheet (3), the insulating sheet (3) is brought into close contact with the coil end portion (4), and then heated and cured to fix the coil and seal the coil end. Insulate the parts.

4 to 6 show an embodiment of the electric motor according to the present invention using the stator described above, in which FIG. 4 is a side view, FIG. 5 is a plan view, and FIG. It is an AllFrdi diagram.

In the figure, (υ is the stator mentioned above, (7) is a bottomed cylindrical lower housing, (8) is an upper housing formed of a strip steel plate. (9) is attached to the housing f?l +81. The rotary shaft I fixed to the rotor α is supported via the bearing metal (9).

An upper housing (8) and a lower housing (7) are attached to both ends of the stator core (2), and the upper housing (8) made of a strip steel plate protrudes from the stator core (2). Attach the coil end portion (4) to the side covered and insulated with the insulating sheet (3). Housing (7), (8
) is installed using the positioning claw 02c provided on the stator (housing 171 t8). Position the stator by bringing the knife into contact with it and fix both housings (7) and (8).Both housings (7) , (8) are fixed using screws in the embodiment, but they may be fixed by welding.

As is clear from Fig. 115, the upper housing (8) of this electric motor is made of a strip steel plate, so the stator (υ part is not completely covered, but the coil end 51
4) is completely covered and insulated with the insulating sheet (3), so there is no risk of short circuit. Therefore, it is possible to make a housing small enough to mount the bearing metal (9) using strip steel plate, which can significantly reduce the amount of materials used, making the motor smaller and lighter, and the open part also improves the cooling effect of the motor. There are various advantages such as significant improvement.

Further, in the embodiment, only the upper housing is formed of a strip-shaped steel plate, but the coil end portions at both ends may be covered and insulated with an insulating sheet, and both housings may be formed of a strip-shaped steel plate. Furthermore, the housing can be constructed by stacking the strips #il& in a cross shape.

As explained above, 1. According to the present invention, at least one end of the housing can be formed of a strip steel plate, so the material for the housing can be significantly reduced, and the electric motor can be made smaller, lighter, and lower in cost. I can do it.

Furthermore, since the housing is formed from a strip-shaped steel plate, the housing can be made extremely easily.

Furthermore, since the housing is made of steel strip,
Since the stator portion is not completely destroyed, the open portion significantly improves the cooling effect of the motor, which is of great practical value.

[Brief explanation of the drawing]

The drawings are all related to the present invention; Fig. 1 is a plan view of the stator, Fig. 2 is a schematic cross-sectional view showing the coil end portion of the stator covered with an insulating sheet, and Fig. 3 shows the insulating sheet. FIG. 6 iA) is a plan view showing the sheet, and FIG.
Figure (B) shows a rectangular insulating sheet, Figures 4 to 6 show an electric motor according to the present invention, Figure 4 is a side view, Figure 5 is a plan view, and Figure 6 is A--A in Figure 5. It is an A sectional view. (υ・, stator, (2)... stator core, (3)...
Insulation sheet 1.41+51・Coil end m, +7+
・・・Door housing, 18+...h housing, (9
)...bearing metal, shout...rotor. 247-

Claims (1)

[Claims] +11 Articles of Incorporation An electric motor consisting of a stator with a housing attached to both ends of the iron core, and a rotor rotatably supported by the housing via bearings, the coil ends protruding from both ends of the stator iron core. An electric motor characterized in that a coil end portion at at least one end of the section is covered and insulated with an insulating sheet, and a housing that covers an end portion of a stator core covered and insulated with the insulating sheet is formed of a band-shaped steel plate.