JPH04222442A - Stator of motor and fabrication thereof - Google Patents

Abstract

PURPOSE:To provide high quality pole and stator and to facilitate the work for press fitting and securing the pole to a yoke by securing a plurality of poles through a fixing frame. CONSTITUTION:A fixed frame 5 is formed from the side face to a bridge, except the ends of the outer peripheral fitting part and the inner peripheral bridge part of a pole 2, and respective poles 2 are positioned and secured accurately by means of the fixing frame thus constituting a pole body 1 which is then press fit in a yoke 15 thus producing a stator. The fixing frame 5 is composed of a resin and the poles 2 are secured by means of a positioning die and then the resin is fed into a space formed between the side face of the pole 2 and the bridge thus forming the fixing frame 5 for securing the poles 2.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a stator for an electric motor in which a plurality of magnetic poles having a laminated structure are fixed to a yoke, and a method for manufacturing the same.

0002

[Prior Art] As a means of downsizing electric motors and obtaining high torque, a method has been adopted in which a plurality of magnetic poles provided on a stator are made independent of each other to prevent magnetic flux from leaking to adjacent magnetic poles. ing.

[0003] For example, as a prior art of this type, Japanese Patent Laid-Open No.
No. 123948 discloses a method for manufacturing a stator, in which magnetic pole steel sheets are separately punched out by dividing magnetic poles and yokes, and then laminated separately to a predetermined size, and then the magnetic poles are formed with irregularities on the outer periphery. The core metal is fitted and temporarily fixed, and in this state, the insulating material and coil winding are inserted through the outer circumferential opening, and the tips of the magnetic poles are press-fitted and fixed into the magnetic pole joint formed on the inner circumference of the yoke, and each magnetic pole is A process is adopted in which the core metal is removed after the metal core is positioned and fixed.

Of course, each magnetic pole is punched out while being radially connected by a bridge, and after inserting the insulating material and the coil winding through the outer peripheral opening, it is press-fitted and fixed into the yoke, so that each magnetic pole is independent. It is also known how to remove parts of the bridge. (For example, JP-A-60-167658, JP-A-60-26436, etc.)

[0005]

[Problems to be Solved by the Invention] However, in the above method, the work of attaching a winding to each magnetic pole of a laminated structure of a plurality of magnetic poles and press-fitting them to the stator yoke is troublesome, and the process is not only inefficient. First, there is a problem that the precision of the rotor insertion hole formed by press-fitting is poor, and it is difficult to temporarily fix the magnetic poles to the core metal, and the core metal after press-fitting and fixing it to the yoke. The removal work is extremely complicated and cannot be said to be a manufacturing method suitable for mass production. Furthermore, the method of press-fitting and fixing each iron core into the yoke while radially connecting them with bridges and removing a part of the bridge so that each magnetic pole becomes independent may cause burrs or burrs in the insertion hole of the rotor. However, there is also the problem that noise is generated in the electric motor due to a decrease in the precision of the insertion hole.

The present invention solves the above-mentioned conventional problems, and provides a stator for an electric motor that improves the dimensional accuracy of the rotor insertion hole and can be manufactured by a simpler method, and a method for manufacturing the same. The purpose is to

[0007]

[Means for Solving the Problems] In order to achieve this object, a stator for an electric motor according to the present invention and a method for manufacturing the same are provided. , each magnetic pole is fixed to a side surface of the magnetic pole excluding at least a part of the outer peripheral fitting part and a part of the inner peripheral bridge tip through a fixing frame molded with resin to form the magnetic pole body; In the stator of an electric motor, in which the coil winding is inserted into the opening of the yoke and then press-fitted and fixed to the yoke, the magnetic pole composed of a laminated structure is positioned by a positioning mold, at the fitting part on the outer circumference of the magnetic pole and at the bridge tip on the inner circumference of the magnetic pole. A space is provided from the side surface of the magnetic pole to the bridge, and the space communicates with the space of the adjacent magnetic pole, and a resin is poured into this space and hardened to form a fixing frame. The manufacturing method is such that a coil winding portion is inserted into an opening of a magnetic pole body made up of magnetic poles fixed by a fixed frame, and then press-fitted and fixed to a yoke.

[0008]

[Operation] With this structure, each magnetic pole constituting the magnetic pole body is simply press-fitted and fixed into the fitting groove formed on the inner circumferential surface of the yoke, and a portion of the bridge is not removed after being fixed to the yoke. In addition, press-fitting each magnetic pole into the fitting groove separately results in poor workability, and the dimensional accuracy of the rotor insertion hole decreases because the press-fitting and fixing positions are not constant. However, in the present invention, each magnetic pole can be positioned and fixed with resin before being press-fitted and fixed to the yoke.

[0009] With the plurality of magnetic poles having a laminated structure positioned by a mold, resin is poured into the space left between the mold and the magnetic poles, and when the resin hardens, each magnetic pole is integrated at a predetermined position. Ru. After that, a predetermined coil winding is inserted into the outer peripheral opening, and press-fitted and fixed to the yoke. The resin that positions the magnetic poles is a type of insulator, and there is no need to insert another insulating material into the outer peripheral opening.

0010

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

In FIG. 1, 1 is a magnetic pole body, 2 is a magnetic pole, and 3 is a magnetic pole body.
are teeth, 4 is a side surface, 5 is a fixed frame, 14 is an opening, 1
5 is a yoke, 16 is a fitting groove, and 17 is a rotor insertion hole.

[0012] A stator of an electric motor configured as above,
and its manufacturing method will be explained in detail using FIGS. 2 and 3. First, in FIG. 2, a plurality of magnetic poles 2 are arranged in a magnetic pole body 1 at equal intervals in the radial direction. Each of these magnetic poles 2 is constructed by laminating a plurality of teeth 3 having the same shape, and a fixed frame 5 is fitted onto the side surface 4 of the magnetic pole 2 in order to be arranged at a predetermined position. The fixed frame 5 is a frame body made of resin, and the plurality of magnetic poles 2 are positioned and fixed at equal intervals in the radial direction via the fixed frame 5, forming the magnetic pole bodies 1.

By the way, if the fixed frame 5 is inserted between the adjacent magnetic poles 2, each of these magnetic poles 2 cannot be positioned with high precision. Therefore, in the present invention, the magnetic poles 2 are accurately positioned using a mold, and the magnetic poles 2 are positioned precisely. The space left between the mold and magnetic pole 2 (
Pour the resin into the gap) and let it harden.

[0014] The form of the positioning mold used here is not particularly limited, but a mold is used that can position the inside of the magnetic pole, which becomes the rotor insertion hole, and the outside of the magnetic pole, which is press-fitted into the inner periphery of the yoke. At the same time as positioning using the mold, resin is poured and fixed. Of course, when precision is not required, positioning may be performed on either the inside or outside of the magnetic pole.

FIG. 3 shows a specific example of the positioning mold,
The magnetic pole 2 is positioned by the inner mold 6 and the outer mold 7,
Projections 8 corresponding to the number of magnetic poles 2 are provided on the outer periphery of the inner mold 6, and the bridges 9 of the magnetic poles 2 fit between both projections 8. A taper 10 is formed at the tip of the bridge 9, and the inclined side surface 11 of the protruding piece 8 abuts against the taper 10 to accurately position the inner periphery of the magnetic pole 2. On the other hand, outer mold 7
The fitting part 12 on the outer periphery of the magnetic pole 2 press-fitted into the yoke is restrained and positioned, and the outer mold 7 composed of a plurality of split molds is inserted into the inner mold 6.
If the magnetic poles 2 are pressed in the direction of the inner and outer molds 6
・It is restrained between 7 and placed facing the radial direction.

As shown in the figure, the outer mold 7 is inserted into the opening of each magnetic pole 2 to position its fitting portion 12, but there is a small space 13 between the outer mold 7 and the side surface 4 of the magnetic pole 2. The space 13 communicates with the space 13 formed on the side surface 4 of the adjacent magnetic pole 2. If resin is poured into this space 13 and hardened, a fixed frame 5 as shown in FIG. 2 is formed, and each magnetic pole 2 is fixed without shifting.

By the way, a predetermined coil winding group is inserted into the opening 14 of the magnetic pole body 1 constructed as described above, and is press-fitted and fixed to the rear yoke to complete the stator.

FIG. 1 shows this stator, with each magnetic pole 2
The fitting portion 12 is a fitting groove 1 formed on the inner peripheral surface of the yoke 15.
The rotor insertion hole 17 is provided in the center of the magnetic pole body 1 by press-fitting and fixing it into one piece.

As described above, in the stator of the present invention, magnetic poles having a laminated structure are fixed through a fixing frame to constitute a magnetic pole body, and the magnetic pole body has a state in which each magnetic pole is fixed by a positioning mold. Since it is manufactured by pouring resin in the process, it is possible to easily obtain a highly accurate motor stator.

[0020]

[Effects of the Invention] As described above, in the present invention, a magnetic pole composed of a laminated structure of disassembled teeth is fixed in a predetermined position with a positioning mold, resin is poured in this state, and the fixed magnetic pole body is press-fitted into a yoke. The productivity is extremely high. In other words, there is no need for the conventional process of removing the bridge portion or temporarily fixing the magnetic poles. Furthermore, the positioning accuracy is extremely high and a high quality stator can be obtained. This magnetic pole is fixed by a fixed frame and becomes a single independent component as a magnetic pole body, which is convenient to handle and also saves labor in press-fitting into the yoke. Furthermore, since the fixed frame that fixes each magnetic pole also functions as an insulator, there is no need to provide special insulation when inserting the coil winding group into the opening. method can be realized.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a stator according to an embodiment of the present invention.

[Fig. 2] A cross-sectional view of a magnetic pole body according to an embodiment of the present invention.

[Figure 3] Partially enlarged view of the magnetic pole of the present invention fixed with a positioning mold

[Explanation of symbols]

1 Magnetic pole body 2 Magnetic pole 3 Teeth 4 Side 5 Fixed frame 6 Inner mold 7 Outer mold 8 Projection piece 9 Bridge 10 Taper 11 Slanted side 12 Fitting part 13 Space 14 Opening 15 York 16 Fitting groove

Claims (2)

[Claims] 1. A magnetic pole body comprising a plurality of magnetic poles having a laminated structure arranged in a radial direction, the side surface of the magnetic poles excluding at least a part of the outer peripheral fitting part and a part of the inner peripheral bridge tip, A stator for an electric motor, characterized in that each magnetic pole is fixed to form the magnetic pole body through a fixed frame molded with resin, and a coil winding is inserted into an opening of the magnetic pole body and press-fitted and fixed to a yoke. 2. A magnetic pole having a laminated structure is fixed in the radial direction by abutting against a fitting part on the outer periphery of the magnetic pole and a bridge tip on the inner periphery of the magnetic pole using a positioning mold, and a space is formed from the side surface of the magnetic pole to the bridge. A fixed frame is formed by pouring resin into this space and hardening the space, and the coil winding portion is inserted into the opening of the magnetic pole body made up of the magnetic poles fixed by the fixed frame. A method of manufacturing a stator for an electric motor, characterized by inserting the stator into the yoke, and press-fitting and fixing the stator into the yoke.