JPH01138953A - Manufacture of stator for rotary 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 [Object of the Invention] (Industrial Field of Application) The present invention relates to a method of manufacturing a stator for a rotating electric machine, in which a stator is constructed by coupling teeth portions together.

(Prior Art) Conventionally, the following three methods have been used to manufacture a stator for an electric motor, which is a rotating electric machine.

First, in FIGS. 9 and 10 showing a first conventional example, a plurality of teeth portions 1, for example, four teeth portions 1 are connected and integrated by a narrow bridge portion 1a of the inner diameter portion. A bobbin 3 in which a coil 2 is wound around each tooth portion 1
After that, each tooth portion 1 is connected to the yoke 4 to form the stator 5. The circular inner peripheral portion of the tooth portion 1 forms a field space portion 6 in which a rotor (not shown) is arranged.

Further, in FIGS. 11 and 12 showing the second conventional example, a plurality of, for example, four, teeth portions 7 are formed independently, and a coil 8 is wound around each of these teeth portions 7. The stator 11 is constructed by fitting and attaching the pobbin 9, and then connecting each tooth portion 7 to the yoke 10. Also in this case, the inner peripheral portion of each tooth portion 7 forms a field space portion 12 in which the rotor is arranged.

Note that the teeth portion 1 (including the bridge portion 1a), the teeth portion 7, and the yokes 4, 10 in the first and second conventional examples
It is constructed by laminating a large number of punched steel plates formed by punching silicon steel plates.

(Problems to be Solved by the Invention) However, in the stator 5 configured as in the first conventional example, when the coil 2 is energized and each tooth portion 1 generates magnetic flux to act on the rotor, the teeth portion 1. Each magnetic pole is magnetically short-circuited at the bridge portion 1a that connects each other, increasing the leakage magnetic flux, resulting in a problem that the efficiency and output of the motor are reduced accordingly.

Furthermore, in the stator 11 configured as in the second conventional example, each tooth portion 7 is independent, so there is no problem of large leakage magnetic flux as in the first conventional example; 7 must be individually formed by laminating punched steel plates, and must be individually joined to the yoke 10, which increases the number of assembly steps, resulting in a problem that it takes 2 hours and is expensive. .

Accordingly, an object of the present invention is to provide a method for manufacturing a stator for a rotating electrical machine, which allows manufacturing a stator having teeth portions with less leakage magnetic flux through fewer assembly steps.

[Structure of the Invention] (Means for Solving the Problems) A method for manufacturing a stator for a rotating electrical machine according to the present invention includes forming several m teeth portions connected by a half-cut connecting portion, The present invention is characterized in that, after winding a coil around just a few of the teeth, these teeth are connected to a yoke, and then the connecting portion is removed.

(Function) According to the -1-2 method, several teeth parts are laminated in an integrated state and are joined to the yoke, and after joining with the yoke, the connecting part is removed. As a result, the plurality of teeth portions become independent.

(Embodiment) An embodiment in which the present invention is applied to an electric motor will be described below with reference to FIGS. 1 to 8.

First, each component before assembly will be explained. In FIG. 3, 20 is a rectangular frame-shaped yoke formed by laminating a large number of punched steel plates, and a wedge-shaped groove 20a is provided in the center of the inner part of the four sides. It is formed.

In FIG. 1, reference numeral 21 denotes a connecting tooth part body, which consists of a plurality of teeth parts 22, for example, four teeth parts, and a connecting part 23 that connects these parts. Each tooth portion 22 includes a coil mounting portion 22a and a coil mounting portion 22a.
an arcuate magnetic pole portion 22b formed at one end of the yoke 20, and a groove portion 20a of the yoke 20 at the other end of the coil mounting portion 22a.
A wedge-shaped engagement protrusion 22c formed in a shape that fits into the
It consists of.

Further, the connecting portion 23 is located on the inner peripheral side of the magnetic pole portion 22b of each tooth portion 22 and has a cylindrical shape, and the magnetic pole portion 2 is located on the outer peripheral portion of the connecting portion 23.
Four wedge-shaped protrusions 23a are formed at equal intervals between the two protrusions 2b. This connecting teeth body 21 is formed by laminating a large number of punched steel plates 21'' in the same way as the yoke 20, but this punched steel plate 21'' is formed by laminating a large number of punched steel plates 21'' when the punched steel plates of the yoke 20 are punched from a silicon steel plate. The punched steel plate 21' is formed by punching at the same time, as shown in FIG. The teeth portion corresponds to 22゛,
It is composed of a connecting portion equivalent portion 23'' having a convex portion equivalent portion 23a'', and the connecting portion equivalent portion 23'' is made into a half-cut state with respect to the tooth portion equivalent portion 22'' during the punching described above. Therefore, such a punched steel plate 21
Even in the connecting teeth part body 21 constructed by laminating a large number of teeth 22, each of the four teeth parts 22 is connected by a connecting part 23 in a half-cut state. In FIG. 5, a coil 24 is wound around a rectangular cylindrical bobbin 25 made of an insulating material.

Next, 9 assembly steps will be explained. First, on the coil mounting portion 22a of each tooth portion 22 of the connecting tooth portion body 21,
A bobbin 25 wound with a coil 24 is fitted and attached. FIG. 6 shows the state in which this installation is completed. Next, the engagement protrusions 22c of each tooth portion 22 in the mounting assembly shown in FIG. 6 are press-fitted into the grooves 20a of the yoke 20 to form a temporary assembly shown in FIG. 7. Finally, the connecting portions 23 of the connecting teeth body 21 in the temporary assembly shown in FIG. 7 are removed from each tooth portion 22 by a press. Therefore, the removed connecting portion 23 becomes as shown in FIG. As a result,
As shown in FIG.
The stator 26 is completed in which the individual teeth portions 22 are coupled to the yoke 20, that is, a gap is provided between the magnetic pole portions 22b of the teeth portions 22.

In this stator 26, the four teeth portions 2
A field space 27 is formed by the two magnetic pole parts 22b, and a rotor (not shown) is disposed in this field space 27 to constitute an electric motor.

According to this embodiment, the following effects can be obtained. That is, by connecting and integrating the four teeth portions 22 by the half-cut connecting portions 23, the teeth portions 22 can be laminated into one connecting tooth portion body 21 and connected to the yoke 20. Therefore, compared to the second conventional example, the assembly work process is reduced.
It can be manufactured at a low cost, and furthermore, the connecting portion 2 can be connected from the teeth portion 22.
In the completed stator 26 from which the coil 2 is removed, a gap is formed between each tooth portion 22 and each tooth portion 22 is in an independent state.
4, leakage magnetic flux is reduced when the motor is energized, and therefore a motor with high efficiency and high output can be obtained.

By the way, conventionally, the field space part 6 (see FIG. 9) and 1
2 (see FIG. 11) are laminated to form a rotor. In this case, there is no space between the rotor and the field spaces 6, 12. It was necessary to cut the outer periphery of the rotor to create an air gap. On the other hand, according to this embodiment,
The inner and outer diameter dimensions of the connecting portion 23 are set to correspond to the air gap, and the rotor is constructed from a circular punched steel plate that is punched out to form the hole 28 (see FIG. 7) of the connecting portion 23. As a result, an appropriate air gap is formed between the field space 27 formed by removing the connecting portion 23 from the teeth portion 22 and the above-mentioned rotor, and therefore an air gap is formed. This eliminates the need to cut the outer periphery of the rotor, which was previously necessary.

In addition, in the embodiment described in "U", the cylindrical connecting part 23 having the wedge-shaped convex part 23a is provided, but for example, the convex part 2
Even if the four wedge-shaped connecting portions connecting only the magnetic pole portions 22b of the teeth portions 22 corresponding to 3a are provided in a half-cut state, substantially the same effect as in the embodiment described in - can be obtained.

In addition, the present invention is not limited to the embodiments described above and shown in the drawings, but may be implemented with appropriate modifications within the scope of the invention, such as being applicable not only to electric motors but also to rotating electric machines in general. It's something you get.

[Effects of the Invention] As is clear from the above description, according to the method of manufacturing a stator for a rotating electric machine of the present invention, a plurality of teeth parts are connected and integrated by a half-cut connecting part, and later the Since the connecting portions are removed, a stator having teeth portions with low leakage magnetic flux can be manufactured at low cost using fewer sets of +'f- work steps.

[Brief explanation of the drawing]

1 to 8 show one embodiment of the present invention, in which FIG. 1 is a perspective view of a connecting teeth body, FIG. 2 is a front view of a stator, and FIG. 3 is a perspective view of a yoke. , Fig. 4 is a perspective view of the punched steel plate showing a half-cut state, Fig. 5 is a perspective view of the coil, Fig. 6 is a perspective view showing the coil attached to the connecting teeth body, and Fig. 7 is a temporary assembly. FIG. 8 is a front view of the stator in this state, and a perspective view of the punched connecting portion. 9 is a front view of a stator showing a first conventional example, FIG. 10 is a perspective view of the tooth portion, FIG. 11 is a front view of a stator showing a second conventional example, and FIG. 12 is a front view of a stator showing a second conventional example. is a perspective view of the teeth portion. In the drawing, 20 is a yoke, 21 is a connecting tooth body, 22
23 represents a tooth portion, 23 represents a connecting portion, 24 represents a coil, and 26 represents a stator. Figure 1jP12 Figure 3 Figure 4 Figure 5 Figure 6 Figure 7 Figure 8 Figure 9 Figure 10 Figure 11 Figure 12

Claims (1)

[Claims] 1. A plurality of teeth parts are formed so as to be connected by a connecting part in a half-cut state, and after winding a coil around the plurality of teeth parts, these teeth parts are connected to a yoke, and then the above-mentioned A method of manufacturing a stator for a rotating electric machine, characterized in that a connecting portion is removed.