JPH089571A - Frameless rotating electric machine - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide a frameless rotating electric machine having a stator structure in which a stator core can be easily fixed and a dedicated mounting plate for a bracket is unnecessary. [Structure] A stator core 4 is formed by laminating silicon steel plates 14 having a plurality of holes 4a formed along the circumferential direction and a plurality of other holes, and at this time, each hole 4a is a continuous cavity. Four
a and the die provided on both end faces of the stator core 4 are die-cast (aluminum die-cast) to form the fixing portion 2 and the seats 5 and 6, and the fixing portion 2 fixes the silicon steel plate 14 and by stamping. Fitting portions 5a and 6a are formed on the seats 5 and 6, and brackets 7 and 8 are attached so as to be fitted into the fitting portions, and iron rods are inserted into the other plurality of holes for positioning. Meanwhile, the silicon steel plates 14 are laminated and the stator core 4 is reinforced.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a frameless rotating electric machine, and is particularly useful when applied to the assembly of a stator.

[0002]

2. Description of the Related Art FIG. 1 is a longitudinal sectional view showing a main part of a frameless electric motor according to the prior art. In the figure, 21 is a frameless electric motor, 22 and 23 are brackets, 24 is a stator core, 25 is a coil, 26 is a silicon steel plate, 27 and 2
Reference numeral 8 is a mounting plate.

Of these, the stator core 24 is formed by laminating a large number of silicon steel plates 26 in the direction of the rotation axis (not shown), and the coil 25 is wound around the inner peripheral portion. Further, mounting plates 27, 28 are provided on both left and right end surfaces of the stator core 24 in the drawing.
Are provided respectively. The fitting portions 27a, 28a are formed on the peripheral portions of the mounting plates 27, 28 by the stamping process.
Are formed respectively, and these fitting portions 27a, 27a
Brackets 22 and 23 are attached so as to fit into 8a.

[0004]

By the way, conventionally, as the fixing means of the stator core 24, that is, the laminated silicon steel plates 26, means for welding the outer peripheral surfaces of the silicon steel plates 26 after laminating the silicon steel plates 26 and each of the silicon steel plates. It is roughly classified into two, that is, a means for fixing a crimping groove in advance by 26 and fixing them by these.

However, in the former method, it is necessary to provide a groove for welding in the silicon steel plate 26. In addition, it is necessary to weld together with a plate that also serves as a reinforcement, which takes a lot of man-hours. Furthermore, it is necessary to provide the silicon steel plate 26 with alignment grooves for positioning. On the other hand, with the latter means, it is not possible to provide the caulking groove on the entire circumference of the silicon steel plate 26, and therefore, problems such as peeling of the silicon steel plate 26 are likely to occur.

Further, since the silicon steel plate 26 cannot be stamped, the brackets 22 and 23 must be mounted using the mounting plates 27 and 28 which are iron plates capable of stamping as described above. The number of parts will increase and the assembly time will not be long.

Therefore, in view of the above-mentioned prior art, the present invention has an object to provide a frameless rotating electric machine having a stator structure in which the stator core can be easily fixed and a dedicated mounting plate for the bracket is unnecessary. And

[0008]

The first structure of the present invention to achieve the above object is to stack silicon steel sheets having a plurality of holes formed along the circumferential direction, and the plurality of holes at this time are A stator core formed by fixing the silicon steel plate by a fixing portion formed by die-casting in each continuous cavity,
A mold is provided on both end faces of the stator core, and a bracket mounting seat integrally formed with the fixing part by die casting is provided in the mold.

A second structure of the present invention that achieves the above object is the same as the first structure, in which a plurality of other holes are formed in each silicon steel plate along the circumferential direction and these holes are continuous with each other. A rod having sufficient strength is inserted into each of the other cavities thus formed.

A third structure of the present invention for achieving the above object is characterized in that, in the first or second structure, the fixing portion and the seat are made of aluminum cast.

[0011]

According to the present invention having the above-mentioned structure, the laminated silicon steel plates can be easily fixed by the fixing portion formed by die casting, and die forming is performed without using a dedicated mounting plate. Brackets can be easily attached to both sides of the stator core via the seat. In addition, by inserting the rod into the other cavity, the positioning when stacking the silicon steel sheets is easy, and the stator core is reinforced.

[0012]

Embodiments of the present invention will now be described in detail with reference to the drawings.

FIG. 1 is a vertical sectional view showing a main part of a frameless electric motor according to an embodiment of the present invention, and FIG. 2 is a front view of a silicon steel plate. In both figures, 1 is a frameless electric motor, 2 is a fixed part, 3 is a coil, 4 is a stator core, 5 and 6 are seats,
7 and 8 are brackets, 14 is a silicon steel plate, and 15 is a bar.

Of these, the stator core 4 is formed by stacking a large number of silicon steel plates 14 in the direction of the rotation axis (not shown) as shown in FIG. 1 and fixed by the fixing portion 2 in the cavity 4a. The coil 3 is wound around the circumference. Seats 5 and 6 are provided on both left and right end surfaces of the stator core 4 in FIG. 1, and brackets 7 and 8 are attached to the seats 5 and 6, respectively.

More specifically, as shown in FIG. 2, each silicon steel plate 14 has a plurality of holes 14a in the vicinity of the outer circumference along the circumferential direction.
And 14b are alternately formed, and the coil 3 is formed on the inner peripheral portion.
Slot 14c for inserting and winding (not shown)
A plurality (partially omitted in the drawing) is formed along the circumferential direction.

A stator core 4 is formed by using the silicon steel plate 14 as described above.
In order to form the above, first, the iron rod 15 is inserted into the hole 14b of the silicon steel plate 14, and the silicon steel plate 1 is positioned by this.
4 is laminated. After the silicon steel plates 14 are stacked in this manner, the fixing portions 4a are formed by die casting (aluminum die casting) in the respective cavities 4a in which the plurality of holes 14a are continuous, and the silicon steel plates 14 are fixed by these. Thus, the stator core 4 is formed.

Molds are provided on the left and right end surfaces of the stator core 4 in FIG. 1 in advance, and the seats 5 and 6 are integrally formed with the fixed portion 4a by die casting. Fitting portions 5a, 6a on the outer peripheral portions of the rear seats 5, 6 by Shiro processing.
Are respectively formed, and the brackets 7 and 8 are attached so as to fit into the fitting portions 5a and 6a.

As described above, according to the present embodiment, the stator core 4, that is, the laminated silicon steel plates 14 can be easily fixed by aluminum die casting, and the welding groove, the reinforcing plate or the caulking groove as in the conventional case can be obtained. Etc. are unnecessary. See also
Since the brackets 7 and 8 can be attached by applying Shiro processing to 6, mounting plates 27 and 28 for exclusive use as in the past
Is unnecessary. Therefore, the number of parts is reduced, and the number of assembling steps can be reduced accordingly.

Further, since the silicon steel plates 14 can be easily positioned by inserting the rods 15 into the holes 14b of the silicon steel plate 14, the alignment groove as in the prior art is not required and the assembling is facilitated. Further, the stator core 4 is reinforced by the rod 15.

Of course, the holes 14a formed in the silicon steel plate,
The number of 14b can be arbitrarily set as needed.

[0021]

According to the present invention as described in detail with reference to the above embodiments, the fixed portions and seats formed by die casting easily fix the laminated silicon steel plates without the need for welding grooves or the like. In addition, the bracket can be mounted without requiring a dedicated mounting plate.
Therefore, the number of parts is reduced, and the number of assembling steps can be reduced. Further, by inserting a rod into a plurality of other holes of the silicon steel plate, the positioning when stacking the silicon steel plates is easy and the stator core is reinforced.

[Brief description of drawings]

FIG. 1 is a vertical sectional view showing a main part of a frameless electric motor according to an embodiment of the present invention.

FIG. 2 is a front view of a silicon steel plate.

FIG. 3 is a vertical cross-sectional view showing a main part of a frameless electric motor according to a conventional technique.

[Explanation of symbols]

 1 Frameless Electric Motor 2 Fixed Part 3 Coil 4 Stator Iron Core 5,6 Seat 7,8 Bracket 14 Silicon Steel Plate 15 Bar

Claims (3)

[Claims] 1. A fixing portion formed by stacking silicon steel sheets having a plurality of holes formed along a circumferential direction and die-casting into a cavity formed by connecting the plurality of holes at a time. Having a stator core formed by fixing a silicon steel plate, a mold on both end faces of the stator core, and a bracket mounting seat integrally formed with the fixing part by die casting in the mold Frameless rotating electric machine characterized by. 2. The frameless rotating electric machine according to claim 1, wherein each of the silicon steel plates is formed with a plurality of other holes along the circumferential direction, and the holes are formed in another cavity which is continuous with each other. A frameless rotating electric machine in which each rod having sufficient strength is inserted. 3. The frameless rotating electric machine according to claim 1, wherein the fixing portion and the seat are made of aluminum die cast.