JPS5976131A - Laminated magnetic frame - Google Patents

Abstract

PURPOSE:To enhance the yield of a material and to reduce the number of manufacturing steps of a laminated magnetic frame by forming notched grooves at a suitable interval along one side of a thin iron plate of strip shape. CONSTITUTION:Notched grooves 22 of isosceles triangular shape are punched along one side of a thin strip-shaped iron plate 21. The iron plate 21 is bent at the side formed with the grooves, continuously wound spirally in a frame, and pressed in a thicknesswise direction to form a magnetic frame 2 of polygonal shape. In this case, the grooves 22 are bonded. Since the grooves are thus formed, the plate can be readily bent with weak restricting force for preventing the plate from being deformed, and the work from punching the grooves to the winding can be continuously performed readily.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a laminated magnetic frame for a DC machine. Direct current machines that require continuity in their transient characteristics are now equipped with laminated magnetic frames. It is desirable that the laminated magnetic frame be manufactured without waste of materials and with as few man-hours as possible.

Conventional laminated magnetic frames, as shown in FIGS. 1 and 2, are made by laminating thin iron plates punched using a die. In FIG. 1, a laminated magnetic frame 1 is formed by combining and stacking divided punched iron plates 1, which has the drawback of requiring much effort and time. Figure 2 shows a method in which a laminated magnetic frame is formed by stacking iron plates 12 punched using an integral punching die, which has disadvantages such as very poor material yield and high cost.The present invention eliminates the disadvantages described in On. However, it is an object of the present invention to provide a laminated magnetic frame that can be manufactured with a high material yield and a small number of man-hours. In order to achieve this object, the present invention provides notched grooves at appropriate intervals along the edge of one side of a strip-shaped thin iron plate, and bends this iron plate toward the side where the notched grooves are provided to continuously form a spiral shape. It is intended to form a polygonal laminated magnetic frame by winding and pressing in the stacking direction. .

Next, embodiments of the present invention will be described below with reference to the drawings. FIG. 8 is a perspective view of a laminated magnetic frame according to an embodiment of the present invention;
The figure is a partial plan view of a strip-shaped thin iron plate that is a component thereof. Isosceles octagonal notch grooves 22 are punched out along the edge of one side of the strip-shaped thin iron plate 21 at appropriate intervals, and the strip-shaped thin iron plate 21 is bent to the side where the notched grooves are provided, and then continuous. The magnetic frame 2 is wound spirally around a winding frame (not shown) and pressed in the stacking thickness direction to form a polygonal magnetic frame 2. At this time, the notch grooves 22 are connected.

The method of edgewise bending a thin strip of metal is well known as it is used for winding and other methods, but the inside of the bending direction is compressed and the sheet bulges, and the outside is stretched and becomes thinner and curved. Therefore, in order to prevent deformation, a method is usually used in which a strong restraining force is applied to the plate in the thickness direction and outwards to bend the plate.

In this regard, since the present invention has a notched groove, bending is easy and the restraining force for preventing deformation is weak, and the process from punching out the notched winding groove to winding can be easily performed continuously.

FIG. 5 is a partial plan view of a strip-shaped thin iron plate of a laminated magnetic frame according to another embodiment of the present invention. A dovetail groove 28a is made to protrude from one side of an isosceles octagon in a band-shaped thin iron plate 21, and a notch groove 2B into which a projection 28b that fits into the groove 28& is inserted is punched out from the other side. When bending this strip-shaped thin iron plate, the protrusion 2Bb portion is pushed in the direction perpendicular to the thin iron plate and bent so as to overlap the dovetail groove 28&, and then the protrusion 28b is pushed in the opposite direction to the tip and fitted into the dovetail groove 2B&.

The laminated magnetic frame formed in this way has increased rigidity.

FIG. 6 is a partial front view of a laminated magnetic frame according to another embodiment of the present invention, and FIG. 7 is a partial plan view of a strip-shaped thin iron plate as a component thereof. A notch groove 24 is punched out in the band-shaped thin iron plate 21 so that the joint part becomes a dogleg shape when bent, and the two punched iron plates are stacked front and back, bent, and continuously wound in a spiral shape to form a polygonal shape. A shaped laminated magnetic frame 2 is formed. In this way, as shown in FIG.
Since a and 24b are shifted, (even if a gap is formed at the joint, the gap will not overlap, and the magnetic properties of the magnetic frame will be improved. As shown in FIG. 5, the punched strip-shaped thin iron plate 2
You can also stack the sheets front and back.

According to the present invention, since notched grooves are provided in the strip-shaped thin iron plate, a laminated magnetic frame can be easily formed by continuous winding, the material yield is high, and manufacturing can be performed with less man-hours, resulting in a significant cost reduction effect. It is.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of a conventional laminated magnetic frame, FIG. 2 is a front view of another conventional laminated magnetic frame, FIG. 8 is a perspective view of a laminated magnetic frame according to an embodiment of the present invention, and FIG. FIG. 5 is a partial plan view of a strip-shaped thin iron plate of a laminated magnetic frame according to another embodiment of the present invention, and FIG. 6 is a partial plan view of a strip-shaped thin iron plate of a laminated magnetic frame according to another embodiment of the present invention. A partial front view of the frame, and FIG. 7 is a partial plan view of a strip-shaped thin iron plate that is a component of the frame. 1.2...1! [1 layer magnetic frame. Figure 1 Figure 3 Figure 6 Figure 2 Figure 4 Figure 1 Figure 5 1

Claims (1)

[Claims] 1) Notch grooves are provided at appropriate intervals along the edge of one side of a strip-shaped thin iron plate, and the iron plate is bent toward the side where the notch grooves are provided and continuously wound in a spiral shape. A laminated magnetic frame characterized by being formed into a polygonal shape by turning and pressing in the lamination thickness direction. 2. In the item described in claim 1, the notch groove has a dovetail-shaped groove protruding from one side of the isosceles octagon, and a protrusion that fits into the dovetail-shaped groove protrudes from the other side. A laminated magnetic frame characterized by its shape. 8) A laminated magnetic frame according to claim 1, characterized in that two iron plates provided with notched grooves are stacked on top of each other and wound spirally to form a polygonal shape.