JPS5836144A - Core for shading coil induction motor - Google Patents

Abstract

PURPOSE:To reduce the cost of an induction motor by forming legs at a main core and a yoke core and forming the legs from the notches for winding coils, thereby improving the yield of a material without decreasing the performances of the cores. CONSTITUTION:When a core is produced in combination with a main core 6 and a yoke core 5, lengs 7, 8 are respectively formed at both main core 6 and a yoke core 5. In ths case, the sum (C+C) of the widths C of the legs becomes smaller than the width B of a coil occupying space 4. In this manner, when the cores 5 are punched from the core material, the lengs 7, 8 are formed from the notches to become the coil occupying space 4. Accordingly, the width L' of the material can be reduced smaller than the finished size L of the core, thereby improving the production yield.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an iron core for a shaded coil induction motor, and more particularly to an iron core for a shaded coil induction motor that can save the material of the iron core.

FIG. 1 is a diagram showing an example of the shape and punched state of the core of a conventional shaded coil induction motor, and the core is composed of a yoke core 1 and a main core 2. As shown in FIG. Reference numeral 3 denotes a leg part provided integrally with the main part iron core 2, and the main part iron core 2 and the yoke part iron core 1 are connected through the leg part 3 by uneven parts provided on both. ing. 4 is a notch provided between the legs 3, that is, the yoke core 1
This is the coil-occupied space formed for winding the coil. In the conventional iron core constructed in this way, a hoop material or the like is punched out from a steel plate, which is the core material, in the state shown in Fig. 1, and the steel plate in the four coil-occupied spaces is discarded as scrap. There is. That is, the iron core of the conventional shaded coil induction motor has a disadvantage of poor material yield.

The present invention has been made in view of the actual state of the prior art, and its purpose is to provide an iron core for a shaded coil induction motor with a high material yield.

In other words, the present invention devises the shape and arrangement of the main core and yoke core when punching the core, thereby improving the yield of core material without degrading the performance of the core. It is something.

The core of the shaded coil induction motor of the present invention will be explained below based on the drawings. FIG. 2 is a diagram showing an embodiment of the iron core of the shaded coil induction motor of the present invention, and FIG. 3 is a diagram showing an embodiment of the iron core in a punched state in FIG. 2. In these figures, 5 is the yoke core, 6 is the main core, 7 is the leg of the main core 6, and 8 is the main core.
are the legs of the yoke core 5. As shown in FIG. 2, the core of the present invention differs from the leg portion 3 of the main core 2 in the conventional core.
(Fig. 1) is composed of the leg portion 7 of the main core 6, the yoke core, and the leg 8 of the yoke core 5, and the uneven portions provided on both the main core 6 and the yoke core 5 are connected. Note that the length a of the leg portion 7 of the main portion core 6 and the length of the leg portion B a / of the yoke portion core 5 are approximately equal, and their sum a-1-a'
is the length A of the leg portion of the iron core, that is, the length A of the space occupied by the coil. Further, the sum C+C of the widths of the leg portions 7 and 8 is smaller than the width B of the space occupied by the coil, and is approximately equal to the width B.

However, the performance of the core is no different from that of the conventional core.

With this configuration, when punching the core of the present invention from a steel plate, the punching positions of the main core 6 and the yoke core 5 can be alternately shifted as shown in FIG. As is clear from the comparison with the conventional punched state of the core shown in Figure 1, the area of the scrapped portion can be reduced, and the length L' of the steel plate punched out of the core can be reduced compared to that of the conventional core. can be made smaller than the length L (Fig. 1) of the steel plate to be punched. Therefore, the material yield can be improved and hoop materials etc. can be used effectively.

As mentioned above, the iron core of the shaded coil induction motor of the present invention is
The material yield can be improved without degrading the performance of the core, and the material cost can be reduced.

[Brief explanation of drawings]

FIG. 1 is a diagram showing an example of the shape and punched state of the core of a conventional shaded coil induction motor, FIG. 2 is a diagram showing an example of the core of the shaded coil induction motor of the present invention, and FIG.
It is a figure which shows the punching state of the iron core of a figure. 1.5...Yoke part iron core, 2,6...Main part iron core, 3,
7゜8...Legs, 4...Coil occupied space.

Claims (1)

[Claims] 1. It is composed of a main part iron core and a yoke part iron core, and the main part iron core and the yoke part iron core are connected by two left and right legs, and there is a notch for winding the coil between the legs. In the core of a shaded coil induction motor, the main core and the yoke core each have two legs, and the length of the leg of the main core is approximately equal to the length of the leg of the yoke core. An iron core for a shaded coil induction motor, characterized in that the sum of the widths of the left and right legs (C+C) is smaller than the width of the notch.