JPH027839A - Stator core for motor - Google Patents

Abstract

PURPOSE:To reduce leakage flux from a ring by making a recess in the ring arranged concentrically in the yoke section. CONSTITUTION:A pole piece 13 comprises a ring 14 formed concentrically with a yoke 10 and a plurality of pole pieces 16 projecting from the ring 14 and secured to the yoke 10 at the tip 15. A pole piece 19 also comprises a plurality of pole pieces 15 and a ring 14, where a recess 20 is made in the ring 14. The tooth section core 21 is laminated such that the pole piece 19 is held therein and the pole pieces 13 are placed at the upper and lower faces. By such arrangement, it does not project excessively to the opposite ends of stator and leakage flux from the ring is reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a stator core for an electric motor in which the inside of the stator is connected.

[Conventional technology]

FIG. 5 is a perspective view showing the stator core of a conventional electric motor disclosed in, for example, Japanese Unexamined Patent Publication No. 58-33945. (4) is an iron core plate integrally formed with (51 is a stator with m layers of this iron core plate, (6) is a slot of this stator, in which a winding (not shown) is housed. (7) is This is the slot opening.

The stator core of a conventional electric motor is configured as described above, and a plurality of core plates (1) are laminated to form the stator f51. The winding wire is then wound around the magnetic pole piece (A) by an insert method, thereby being housed in the slot (6).

[Problem to be solved by the invention]

In the stator core of a conventional electric motor as described above, the yoke (
2) and the magnetic pole piece 4) are integrally formed, and the magnetic i The outer circumferential length of the winding part becomes long, causing excess protrusion to the outside from both ends of the stator (51), which poses a problem in that post-processing such as shaping, face treatment, lacing, etc. is required after winding.

This idea was made to solve the problem,
It is an object of the present invention to obtain a stator core for a motor, which can reduce protrusion outward from both ends of the stator and form a motor with good assemblability with less post-processing.

[Means to solve the problem]

This invention was made to solve the problem,
An iron core consisting of a yoke part forming an outer ring part, a ring provided concentrically within this yoke part, and a magnetic pole piece that protrudes radially from the outer periphery of this ring and whose tip is fixed to the yoke part is laminated. In the stator, the ring is provided with a recess that communicates with the stacking direction.

[Effect]

In this invention, leakage magnetic flux from the ring is reduced by providing the ring with the recess.

〔Example〕

FIG. 1 is a plan view of a stator showing an embodiment of the present invention, FIG. 2 is a plan view of the center of the laminated portion of the stator, and FIG. 3 is a cross-sectional view of the slot portion. 6) indicates a part that is the same as or equivalent to the above-mentioned conventional example, and the yoke is a yoke punched out by press working from an iron core (not shown), which forms the outer ring part of the stator (5), and has a plurality of concave shapes on the inner periphery. It has cutouts (11) formed at equal intervals.(12)
(13) is a yoke part in which a plurality of these yokes are laminated, (13) is a magnetic pole piece part A punched out from an iron core by press processing, and a ring (14) is formed concentrically with the above-mentioned yoke 00). A plurality of magnetic pole pieces (15) protrude from this ring and have tips (15) fixed to the yoke.
6). (19) is the magnetic pole piece B, which has the same magnetic pole piece (15) and ring (14) as the above magnetic pole piece part A (13).
The ring (14) is provided with a concave portion (20) having a narrow width. (21) is a toothed iron core, which is laminated by having the above-mentioned magnetic pole piece A (+3) as the upper and lower end surfaces and sandwiching the magnetic pole piece B (+91) therein.

In the stator core of the electric motor configured as described above, a winding (not shown) is wound around the tooth core (21), and the tip (15) of the magnetic pole piece (16) of the tooth core (21) is The tooth core (21) and the yoke portion (12) are fitted into the notch (11) of the yoke (10) by press fitting, for example.
) are integrally fixed to form a stator (5). By making the stator +5 divided into the yoke part (12) and the tooth core (21), direct winding of the winding is possible, and unnecessary overhang of the stator (51) at both ends is avoided. becomes smaller, and in the finished state there is less winding collapse and the outer circumference of the winding part is shortened, reducing post-processing such as forming and improving productivity.Furthermore, the lamination except for the upper and lower end surfaces of the tooth core (21) There is a recess (20) in the ring (14) of the part.
) by narrowing the width of the ring (14), leakage magnetic flux from the ring (14) is reduced, and a decrease in motor efficiency can be prevented.

In addition, FIGS. 4(a), (b), and (c) are partial views of a slot showing other practical examples of this invention, in which the concave portion B (23) or the square hole (24) is inserted from the inside of the ring (14). Alternatively, even if a hole (25) is provided, the same effect as in the above practical example can be expected.

〔Effect of the invention〕

As described above, the present invention includes a yoke portion forming an outer ring portion, a ring provided concentrically within the yoke portion, and a magnetic pole protruding radially from the outer circumference of the ring and having a tip fixed to the yoke portion. In a stator made of a laminated iron core consisting of two pieces, by providing the ring with a recess that communicates with the lamination direction, the yoke part and the toothed core are divided, allowing direct winding, and reducing leakage magnetic flux. This has the effect of making it possible to obtain fewer electric motors.

[Brief Description of the Drawings] Fig. 1 is a plan view of a stator showing an embodiment of the present invention, Fig. 2 is a plan view of the center of the laminated portion of the stator, and Fig. 3 is a sectional view of the slot portion. , Figure 4 (a), (b),
(c) is a partial view of a slot showing another practical example of the present invention, and FIG. 5 is a perspective view showing a stator core of a conventional electric motor. In addition, the same reference numerals in each figure indicate the same or equivalent parts.
9 is a stator, (12) is a yoke part, (14) is a ring,
(15) is the tip, (+6) is the magnetic pole piece, and (20) is the recess. Agent: Masuo Oiwa

Claims (2)

[Claims] (1) An iron core consisting of a yoke part forming an outer ring part, a ring provided concentrically within this yoke part, and a magnetic pole piece that projects radially from the outer circumference of this ring and whose tip is fixed to the yoke part. What is claimed is: 1. A stator core for an electric motor, characterized in that a stator formed by laminating the above-mentioned rings is provided with a recess that communicates with the ring in the laminating direction. (2) A stator core for an electric motor according to claim 1, characterized in that the core consists of a ring having a concave portion and a magnetic pole piece, and is provided in an intermediate portion of the lamination of the stator.