JP2763656B2 - Manufacturing method of motor stator - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a stator of a small electric motor used for a fan or a ventilation fan.

2. Description of the Related Art In recent years, in small motors, windings are applied from the outer diameter side of a stator. A conventional method for manufacturing this type of motor stator will be described with reference to FIGS. 9 to 11. FIG. As shown in the figure, in order to hold the punched tooth cores 101 from falling apart, the tooth cores 101 are sandwiched by a plurality of connecting tooth cores 103 having inner bridge portions 102 from both sides of the multi-part tooth core 101. In this case, the plurality of connecting teeth iron cores 103 are stacked so that the positions of the non-bridging portions 104 are not overlapped. The laminated tooth core 101 is subjected to an appropriate insulation treatment, and then a winding conductor (not shown) is wound around the slot 105 so that the yoke core 1
06 was press-fitted.

In such a conventional configuration, since the connecting teeth iron core 103 has the inner peripheral bridge portion 102, the magnetic flux generated by the winding conductor leaks along the inner peripheral bridge portion 102. This has been the main cause of motor vibration or abnormal noise. In addition, if only the tooth core 101 having no inner peripheral bridging part 102 is used, there is a problem that the tooth core 101 is disjointed and the manufacturing process until the press-fitting into the yoke core 106 becomes difficult. .

The present invention solves the above-mentioned problems, eliminates the inner peripheral bridging portion 102 of the tooth core 101, and further facilitates a series of manufacturing processes such as insulation treatment after lamination of the tooth core 101, winding of a winding conductor, and the like. It is an object of the present invention to provide a method for manufacturing a motor stator that can achieve the following.

Means for Solving the Problems In order to achieve the above object, a first means of the present invention is to provide a ring-shaped yoke core and a plurality of tooth cores which are press-fitted on the inner diameter side of the yoke core. And a rotor core inserted on the inner diameter side of the tooth core, using at least one of the yoke cores as a connecting member, and punching and laminating the tooth core with the tooth core and the connecting member. This is a manufacturing method in which punching and laminating are performed integrally, and a cylindrical cylindrical iron core holding portion having a large thickness is formed outward from the inner peripheral surface of the tooth core in a resin state, and then the connecting member is punched.

The second means is provided with a connecting portion comprising a part of the yoke core between adjacent protrusions on the outer periphery of the substantially T-shaped tooth core,
At the time of punching and laminating the tooth core, at least one layer is formed by punching and laminating the tooth core and the connecting portion integrally, and holding the cylindrical core having a thick wall extending outward from the inner peripheral surface of the tooth core in this shape. This is a manufacturing method in which the connecting portion is punched out after resin molding of the portion.

The third means is a manufacturing method in which the connecting member for connecting the tooth core and the tooth core in the first and second means or the connecting part and the tooth core are punched and laminated in a half-cut state. Things.

The toothed iron core laminated by the manufacturing method of the first means, the second means, and the third means is composed of at least one connecting member formed of a yoke core or a part of the yoke core. The lamination shape is maintained by the connecting portion, and the process can be shifted to the next step, that is, the step of resin-molding the thick cylindrical iron core holding portion from the inner peripheral surface of the tooth core to the outside.
Then, by punching out these connecting members or connecting portions after resin molding of the iron core holding portion, it is possible to facilitate a series of manufacturing processes such as insulation processing and winding of a winding conductor.

Embodiment 1 Hereinafter, a first embodiment of the present invention will be described with reference to FIGS. In the figure, a tooth core 1 is radially located on the outer periphery of a rotor core hole 2 and is punched together with a ring-shaped yoke core 3 'and a rotor core (not shown), and is simultaneously laminated. At least one of the yoke cores 3 ′ is connected to the tooth core 1 as a connecting member 3, and a cylindrical core holding portion 4 is resin-molded on the inner peripheral side of the laminated tooth core 1. During the process, the punched shape, that is, the shape radially located on the outer periphery of the rotor hole 2 is maintained. Then, the connecting member 3 connected to the tooth core 1 is punched out after the resin molding of the iron core holding part 4 is performed, and the exposed tooth core 1 is subjected to an appropriate insulation treatment. (Not shown), and assembled so as to be press-fitted into a ring-shaped yoke core 3 '.

A small number of connecting members 3 and tooth cores 1
Until the step of resin-molding the core holding part 4 while the iron core holding part 4 is connected, the stacked tooth cores 1 are securely held without falling apart, and after the molding of the core holding part 4, The connecting member 3 that is connected can be punched and the next step can be performed, and a series of manufacturing steps can be performed smoothly.

Next, a second embodiment of the present invention will be described with reference to FIGS. The same parts as those in the first embodiment are denoted by the same reference numerals, and detailed description thereof will be omitted. As shown in the drawing, a connecting portion 6 formed of a part of a yoke core 3 ′ is provided between adjacent protrusions 7 of a substantially T-shaped tooth core 1. Here, at the time of punching and laminating the tooth core 1, at least one layer of the tooth core 1 and the connecting portion 6 are punched out integrally, and the cylindrical core holding portion 4 is molded in this shape, and then the connecting portion 6 is formed.
Is to punch out.

With the above-described configuration, each of the stacked tooth cores 1 is disintegrated until the step of molding the iron core holding part 4 in a state where the connecting portion 6 and the tooth core 1 are integrated as in the first embodiment. Therefore, after the molding of the iron core holding portion 4, the connecting portion 6 connected to the core holding portion 4 is punched out and the process can be shifted to the next step.

Next, a third embodiment of the present invention will be described with reference to FIGS. 7 and 8. FIG. The same parts as those in the first and second embodiments are denoted by the same reference numerals, and detailed description thereof will be omitted. As shown in the drawing, a connecting member 3a made of a yoke core and the tooth core 1, or a connecting part 6a and the tooth core 1 are connected by half blanking portions 8 and 8a.

With the above configuration, punching of the connecting member 3a and the connecting portion 6a after the molding of the core holding portion 4 becomes easy, and stress concentration on the core holding portion 4 made of resin is eliminated. As described above, according to the motor stator manufacturing method of the present invention, the tooth core 1 is connected to the connecting member 3 or the connecting portion 6 is provided between the protrusions 7 of the tooth core 1 to thereby provide the tooth core. 1, the core holding portion 4 can be molded as it is, and the tooth core 1 does not fall apart, and insulation treatment, winding conductor winding,
Processes such as press-fitting of the yoke core 3 'can be performed smoothly. Further, since the tooth core 1 does not have a bridging portion, there is obtained an effect that the leakage of magnetic flux between the tooth cores 1 is eliminated, and a high-performance motor that does not generate vibration or abnormal noise of the motor can be assembled. .

In addition, since the connecting member 3 and the connecting portion 6 punched after the resin molding are discarded, when the connecting portion 6 is provided to hold the tooth core 1, the amount of discarding is small, and the electromagnetic steel sheet material to be used is more effectively used. Be utilized. In addition, the cross-sectional area of the yoke core through which the magnetic flux passes increases, and an effect is obtained that an electric motor with improved overall efficiency can be assembled.

Further, the tooth core 1 and the connecting member 3 or the tooth core 1
Since the connecting portion 6 of the projecting portion 7 is in a half-punched state, it is possible to assemble a highly reliable electric motor in which no excessive force is applied to the resin core holding portion 4 when the connecting member 3 or the connecting portion 6 is punched. The effect is obtained.

EFFECT OF THE INVENTION As is clear from the above embodiments, the laminated tooth core retains the shape of the laminated state by at least one connecting member of the yoke core or the connecting part consisting of a part of the yoke core. As it is, it is possible to shift to the next step of resin molding the core holding part, and to punch out while holding the connecting member or the connecting part with the core holding part, so that the insulation processing,
A series of manufacturing processes such as winding of a winding conductor can be facilitated. Further, since the connecting member and the connecting portion have the same shape or a part of the shape of the yoke core, the die for punching the iron core can be used in common. Furthermore, since the connecting member and the connecting portion are located outside the toothed core, the core holding portion is formed without breaking in the lamination direction of the iron core, that is, a simple structure that passes through the rotor hole and the slot. Thus, it is possible to provide a method of manufacturing a motor stator that can eliminate resin burrs and the like in the slot and improve quality.

[Brief description of the drawings]

FIG. 1 is a plan view of a tooth core and a yoke core or a connecting member integrated with each other according to a first embodiment of the present invention, and FIG.
3 is a perspective view of the tooth core after the resin molding, FIG. 4 is a cross-sectional view of the tooth core after the resin molding, and FIG. 5 is a joint iron core after the resin molding. FIG. 6 is a plan view of the toothed iron core of the second embodiment of the present invention integrated with a connecting portion, and FIG. 7 is a toothed iron core of the third embodiment of the present invention, and a half-punched connecting member. FIG. 8 is an enlarged cross-sectional view of a main part of the tooth core, FIG. 8 is a plan view of a conventional iron core, and FIG. 10 is a plan view of a conventional tooth core. FIG. 11 is a cross-sectional view showing the state of lamination of the tooth cores, and FIG. 11 is a plan view of the joint core. 1 ... Tooth core, 3, 3a ... Connecting member, 4 ... Iron core holding part, 5 ... Slot, 6, 6a ... Connecting part, 7 ... Protrusion,
8, 8a: Half blanking part.

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-3-124245 (JP, A) JP-A-3-284144 (JP, A) JP-A-63-299740 (JP, A) JP-A-63-299 224651 (JP, A) JP-A-1-138953 (JP, A) JP-A-1-298931 (JP, A) (58) Fields investigated (Int. Cl. ⁶ , DB name) H02K 15/02

Claims (3)

(57) [Claims] 1. A ring-shaped yoke core, a plurality of tooth cores press-fit to the inner diameter side of the yoke core, and a rotor core inserted into the inner diameter side of the tooth core. Using at least one piece of the yoke core as a connecting member, and punching and laminating the tooth core and the connecting member integrally in the punching lamination of the tooth core, and keeping the inner surface of the tooth core in this shape. A method for manufacturing an electric motor stator, comprising: forming a cylindrical iron core holding portion having a large thickness outward from a resin mold; and punching out the connecting member. 2. A connecting portion comprising a part of a yoke core is provided between adjacent projections on the outer periphery of a substantially T-shaped tooth core, and at least one tooth is formed by punching and laminating the tooth core. The core portion and the connecting portion are punched and laminated integrally, and the cylindrical portion core holding portion having a thick wall is resin-molded outward from the inner peripheral surface of the tooth portion core in this shape, and then the connecting portion is punched out. Manufacturing method of motor stator. 3. A connecting member for connecting a tooth core and a tooth core.
3. The method for manufacturing a motor stator according to claim 1, wherein the connecting portion and the tooth core are punched and laminated in a half-punched state.