JPH0315238A - Stator core of rotating electric machine - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a stator core structure in an induction motor or a synchronous generator.

[Conventional technology]

The closest known example to the present invention is Utility Model Application Publication No. 56-138105
No. 62-244240. In both of the above methods, two different types of core plates are alternately laminated to form fins on the outer periphery to cool the stator core.

[Problem to be solved by the invention]

In the above-mentioned conventional technology, it was very difficult to distinguish the rolling direction of the iron core plate which was continuously punched from the hoop material from the appearance. In particular, there is a problem in that it takes a very long time to measure and manage the thickness of each iron core plate.

The present invention provides cut grooves at two or more locations or an integral multiple thereof on the outer periphery of a core plate that is continuously punched out of a hoop material, and makes one of the cut grooves asymmetrical with respect to the other cut grooves. By forming this, the rolling direction of the iron core plate is clearly indicated in a simple manner. Furthermore, the outer peripheral cut groove serves as a slot punching reference in the next process, and by rotating the core plate by θ° based on this cut groove and punching out the slot, core plates with different thicknesses can be stacked during stacking. However, since the thickness of each core plate is a weighted average and it is possible to reduce variations in stacking thickness, it is possible to provide a rotating electric machine with less electromagnetic vibration.

[Means to solve the problem]

In order to achieve the above object, in the present invention, two or more concave grooves, or an integral multiple thereof, are provided on the outer periphery of the core when punching the core, and one of the grooves is arranged asymmetrically with respect to the other grooves. A small notch groove was formed in the hoop material, and the hoop material was punched out continuously at certain positions so that the rolling direction of the hoop material could be determined. Furthermore, during the slot punching operation in the next step, the small notch groove is rotated in the circumferential direction by θ degrees to equalize the core plate thickness and reduce uneven stacking thickness.

[Effect]

The core plates that are continuously punched from the hoop material are always punched in the same direction, and by visually checking the asymmetric cut groove provided at one location, there is no possibility of misunderstanding the rolling direction of the core.

〔Example〕

An embodiment of the present invention will be described below with reference to FIGS. 1 to 7.

FIG. 1 shows the process of punching out the outer periphery of a core plate 2 from a hoop material 1 in the core plate punching operation.

According to this embodiment, the cut grooves Kz,
Kz is continuously punched to form a cut groove K2.
Unlike other cut grooves, a small cut groove is further formed at the bottom of the groove, and by making it asymmetrical with the other cut grooves Kl, it becomes possible to easily indicate the rolling direction of the iron core plate.

Generally, as shown in Figure 2, the thickness of the hoop plate 1 differs from TI, T2, and Ts depending on the plate width, and the tolerance is ±10% for each. As a result, the iron core block cannot be evenly tightened and held firmly.

As shown in FIG. 3, the present invention is based on the cut groove K2.
Sequentially punch out multiple slots S. Figure 4 shows the cut groove K.
2 in the circumferential direction by θ and punch out the slot S in the same manner as described above. In Figure 5, the slot S is rotated 20 degrees from the notch groove K2, and in Figure 6, it is rotated 3θ from the notch groove K2 and continues. As shown in FIG. 7, the cores 2A to 2D are made into blocks by inserting a slot gauge into the slot S, and the cut grooves K2 are arranged at the same position for every fifth core. ~2D is rotated by θ°, so iron core plate 2A
Even if multiple sheets of ~2D are laminated, the plate thicknesses Tz~T3 are mutually,
Since the weighted average is applied and unevenness in the laminated thickness after lamination can be reduced, the laminated core is completely tightened and maintained, and there is an effect of providing a rotating electric machine with less electromagnetic vibration.

〔Effect of the invention〕

According to the present invention, the rolling direction of the punched core can be easily determined by the asymmetric cut groove at one location. In addition, since the slot punching start position can be rotated by θ° based on this cut groove, it is possible to reduce variations in lamination thickness during core lamination work, and the laminated core is evenly tightened and maintained. , electromagnetic vibration can be reduced.

[Brief explanation of the drawing]

FIG. 1 is a cutaway plan view of an iron core plate showing an embodiment of the present invention;
2 is a sectional view taken along the line nn in FIG. 1, FIGS. 3 to 6 are plan views of the core plate, and FIG. 7 is a perspective view of the core plate block. 1... Hoop material, 2,2A-2D... Iron core plate, K
l...Outer circumference groove, K2...Outer circumference groove, Tl, T2 r
Ta...thickness of hoop material, S...standard slot,
θ゜・・・Outer circumference 1st figure 2nd figure 3rd figure 4th garden

Claims (1)

[Claims] 1. In an iron core formed in a circular or non-circular shape, two or more or an integral multiple of concave grooves are provided on the outer circumferential edge of the core, and one of the grooves is formed in the other grooves. A stator core for a rotating electric machine, characterized in that the shape of the cut groove is changed so as to be asymmetrical with the cut groove, or a small cut groove is formed at the bottom of the cut groove. 2. In claim 1, the slot groove is set at θ with reference to the cut groove provided on the outer peripheral edge.
A stator core for a rotating electric machine that is punched by rotating in degrees.