JPS59132737A - Stator core for motor - Google Patents

Abstract

PURPOSE:To enable to efficiently punch and stably caulk a stator core by uniformly disposing four caulking projections on the core substantially at 45 deg. from the center of a min pole of a yoke and using them also as punching holes. CONSTITUTION:Semipunched caulking projections 2 are formed at the positions of approx. 45 deg. from the center of a main pole of a yoke as seen from the center of a stator core 1 on the core 1 formed by punching in zigzag state intruded to each other on the adjacent outer shape from a steel strip. Further, through bolt holes 3 are partly opened in a direction reverse to the main pole side, and used commonly as punching holes 4 necessary in case of alternately forming to intrude to each other at the core. In this manner, the caulking strength can be improved, and the intruding margin of the core is not failed.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a stator core for an electric motor, and particularly to an improved configuration of the relative positions of caulking protrusions and through bolt holes used for fixing the stator core.

As shown in Fig. 3, the stator core (1) of a conventional electric motor is formed so that the outer shapes of adjacent stators bite into each other, and the through bolt holes (3) are located at the center of the main magnetic pole when viewed from the center of the core. When providing a half-cut caulking protrusion (2) for core layering on a stator core (1) that is located approximately 45'' from the stator core ( 1) Because the four points of the yoke are not evenly spaced, the oak,
It was difficult to mount the steel core, and there were problems with deformation of the inner diameter of the laminated iron core and the strength of the caulking itself.

In order to cope with this, for example, as shown in Fig. 4, the main magnetic pole formed by the main winding housed in the large slot (5) at approximately 45° of the stator core (1), that is, when viewed from the center of the core. It is located at a position of 45° from the center.

As a result, in the case of Fig. 5(a), adjacent stator cores (1
) It is necessary to move in the A direction to ensure the thickness of the punch hole (4) end and the through bolt hole (3) end, which is necessary on the mold in order to punch out the holes so as to bite into them alternately.

Also, in the case of Fig. 5 <b>, A
Or, if you don't move it in direction B, you won't become king. In other words, if the relative position of the through bolt hole (3) and the caulking protrusion (2) is changed, a through hole will be created in the area directly affected by the magnetic pole of the yoke part of the stator core (1), and the magnetic resistance This has the disadvantage that it leads to an increase in the amount of water and a deterioration of the characteristics.

The present invention provides an electric motor having a stator core formed by punching with adjacent outer shapes biting into each other, and a half-cut caulking protrusion for fixing the stator core. The iron part has four equally spaced holes approximately 45 degrees from the center of the main magnetic pole, and one part of the through-bolt holes in the stator core is open and is used as the punched hole required when biting into each other to form the stator core. It is.

Therefore, it is possible to make the stator core shape smaller and to make material removal more effective.With the space constraint of double-row zigzag punching, it is possible to set the crimping position to the optimum position when introducing crimping that can be automated, resulting in efficient punching and Stable caulking can be performed.

The present invention will be described below with reference to embodiments shown in the drawings. (1)
(1) ... is a solid iron core that is punched out from a strip steel plate in a staggered manner with adjacent outer shapes biting into each other, and when viewed from the center of the iron core, from the center of the main magnetic pole part 3- of the yoke part. Provide half-cut caulking protrusions (2) (2)... at approximately 45° positions, and insert through bolt holes (3) (3).
. . . are provided between one part [11, (This is the same as 4).

As described above, the present invention provides a stator core in which the caulking protrusions provided at four locations on the yoke portion of the stator core are evenly spaced to improve caulking strength, and the through bolt holes are formed by biting into each other. Since it also serves as a punching hole on the mold necessary for punching and forming, it is extremely effective without damaging the stator core's penetration (material removal) and without increasing magnetic resistance.

[Brief explanation of the drawing]

FIG. 1 is a plan view of the stator core according to the present invention when it is punched and formed, FIG. 2 is a plan view of the stator core of the present invention, FIG. 3 is a plan view of a conventional example corresponding to FIG. 1, and FIG. The figure is a plan view of the main part of a conventional stator core, and Figures 5 (a) and (b) are partial plane views of the stator core in which the relative positions of the through bolt holes and the locking protrusions in Figure 4 have been changed. It is a diagram. (1)...Stator core (2)...Protrusion for caulking (
3)...Bolt hole

Claims (1)

[Claims] 1) In a stator core that is formed by punching with adjacent outer shapes biting into each other and has a half-cut caulking protrusion for fixing the stator core, the caulking protrusion is connected to the yoke part of the stator core. They are located equally at four locations approximately 45 degrees from the center of the main magnetic pole, and some of the through-bolt holes in the stator core are open and are used as punched holes that are necessary when biting into each other to form the stator core. The stator core of the itI machine is a feature.