JP2899440B2 - Motor stator core - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a stator core of an electric motor used for driving a fan of home electric appliances and the like.

[0002]

2. Description of the Related Art In recent years, in the production of small electric motors, there has been a demand for thorough cost reduction by further mechanization.

Conventionally, the stator core of this type of motor is shown in FIG.
As shown in FIG. 11, a plurality of tooth cores 102 are formed on the outer periphery of a rotor hole 101 into which a rotor (not shown) is to be inserted, while keeping the space of the slot inner peripheral opening 108 at equal intervals and radially. They are arranged. The tooth core 102 is substantially I-shaped,
The inner peripheral part is made of resin such as engineering plastic in order to mechanically retain the radial shape.
3 is molded into a cylindrical shape. The tooth core 102 held and molded is appropriately insulated, and a winding conductor (not shown) is directly wound around the slot 104, and then a yoke portion having a ring-shaped tooth core fitting portion 107 is formed. The iron core 105 was press-fitted.

In the above configuration, each iron core, that is, the yoke core 105, the tooth core 102, and the rotor core (not shown).
Was punched out on the same plane of iron core material and separately laminated by the required number.

[0005]

In such a conventional stator core of an electric motor, punching out of a core material eliminates the need for the material of the slot 104, and is adjacent to the stator core because the whole core shape is circular. Since unnecessary material is generated between the iron cores, there is a problem that the material yield is deteriorated. In addition, when the tooth core 102 and the yoke core 105 are press-fitted, there is a problem that the inner diameter of the tooth core 102 shrinks from an initially set value or a variation occurs in finished dimensions. . SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and a first object of the present invention is to improve the material yield in punching each core from a core material.

[0006] A second object is to improve the dimensional accuracy after completion of the core assembly.

[0007]

A first means for achieving the first object of the present invention is a substantially I-shape in which a winding conductor is wound around a rotor hole into which a rotor is inserted. A tooth core having a plurality of teeth radially, and a yoke core that is press-fitted to the outer periphery of the tooth core to form a magnetic path, wherein the yoke core is not in contact with the tooth core. The fitting portion is divided by the same number as the number of slots, and this divided surface is stamped and laminated with the press-fitting fitting surfaces of the yoke cores, and the split yoke cores are formed by fitting each other. In this configuration, the ring is formed.

[0008] A second means for achieving the first object is that, similar to the first means, the yoke core is formed in two or more slots at a non-fitting portion with the tooth core. Also, the split surface is formed by stamping and laminating with the press-fitting surfaces of the yoke cores, and the split yoke cores are formed into a ring shape by fitting each other. Things.

A third means for achieving the second object is that a substantially I-shaped tooth core, a fitting portion between the split yoke portions and a fitting portion between the split yoke portions have a planar shape of: Each has a configuration having a latching shape.

[0010]

According to the present invention, when the core material is punched, the tooth portion, the yoke portion,
This method is different from the method of punching the respective cores of the rotor in the same plane, and the tooth core, the yoke core, and the rotor core can be punched and laminated on different core material surfaces.

Further, according to the configuration of the third means, the concave portion and the convex portion of the fitting portion of the split yoke core and the fitting portion of the split yoke core and the tooth core can be mutually pulled. Things.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a first embodiment of the present invention will be described with reference to FIGS.
This will be described with reference to FIG. As shown in the figure, a plurality of tooth cores 2 are radially arranged on the outer periphery of a rotor hole 1 into which a rotor (not shown) is inserted. The tooth core 2 is substantially I-shaped, and the inner core is formed of a resin such as engineering plastic to form the tooth core holding part 3 into a cylindrical shape in order to mechanically maintain the radial arrangement. Appropriate insulation treatment is applied to the upper and lower end surfaces of the tooth core 2 and the inner wall of the slot 4 which are held by molding, and a winding conductor (not shown) is directly wound around the slot 4 and then fitted into a ring shape. The split yoke core 5 is press-fitted. The split yoke core 5 has a tooth core fitting portion 6 which is press-fitted to the tooth core 2 on the inner peripheral side, and is divided by the number of slots at a non-fitting portion on the inner peripheral side. It is. In addition, there is a yoke core fitting portion 7 at both ends, and the adjacent split yoke core 5
The concave portion 7a and the convex portion 7b of the yoke portion core fitting portion are press-fitted to each other.

In the above configuration, since the split yoke core 5 is not circular, it is not necessary to simultaneously punch and stack the respective iron cores from the same core material plane, so that the split yoke core 5, the tooth core 2, and the rotor core (see FIG. (Not shown) would be stamped and laminated from separate core materials.

As described above, according to the stator core of the motor according to the first embodiment of the present invention, the cores of the respective parts are effectively and efficiently stamped and laminated from separate core materials, so that the material yield is improved. Will do.

Next, a second embodiment of the present invention will be described with reference to FIG.
This will be described with reference to FIG. The same parts as those of the first means are denoted by the same reference numerals, and detailed description thereof will be omitted.
As shown in the figure, the split yoke core 8 has a tooth core fitting portion 6 on the inner peripheral side, and is divided over a plurality of slots at a non-fitting portion on the inner peripheral side. . Since the split yoke core 8 is not circular in the above configuration, it is not necessary to simultaneously punch and stack the respective iron cores from the same core material plane as in the case of the first embodiment, so that the split yoke core 8 and the tooth core are not required. 2. Each of the rotor cores (not shown) will be stamped and laminated from a separate core material.

As described above, according to the stator core of the electric motor according to the second embodiment of the present invention, the cores of the respective parts are punched and laminated efficiently and efficiently from different core materials, so that the material yield is improved. Will do.

Also, since the number of divisions of the yoke core is small, the process of ring-shaped fitting molding is facilitated, and at the same time,
The roundness accuracy after molding can be improved.

Next, a third embodiment of the present invention will be described with reference to FIG. The same parts as those of the first means and the second means are denoted by the same reference numerals, and detailed description thereof will be omitted. As shown in the figure, an R-shaped engaging member is formed so that the planar shapes of the toothed iron core engaging portions 6 on the inner peripheral side of the split yoke iron core 5 and the yoke engaging portions 7 on both ends are respectively engaged. It has a part 9. Regarding the dimensional tolerance of the engaging portion 9 of the fitting portion, the concave portion has a positive dimensional tolerance, and the convex portion has a negative dimensional tolerance.

With the above configuration, when the split yoke core 5 is formed into a ring shape by fitting, or when the tooth core 2 is press-fitted into the ring-shaped yoke core, the respective fitting portions are formed. Will pull each other.

As described above, according to the stator core of the electric motor according to the third embodiment of the present invention, even if the tooth core 2 is press-fitted into the yoke core, the inner diameter of the tooth core 2 is reduced. That can be eliminated.

In the embodiment, the shape of the engaging portion at the engaging portion is R-shaped, but may be substantially trapezoidal, so that there is no difference in operation and effect.

[0022]

As is clear from the above embodiments, according to the present invention, the cores of the respective parts can be effectively formed from different core materials.
In addition, since the stamping and lamination are performed efficiently, the stator core of the electric motor can be provided which can improve the yield of the material and sufficiently exhibit the rationalization of the material cost.

Further, by reducing the number of divisions of the yoke core, it is possible to provide a stator core of a motor which has an effect of improving material yield and securing roundness after fitting and molding.

Further, by forming the fitting portion of each iron core into a latching shape, even if the tooth core is press-fitted into the yoke iron core, there is no reduction in the inner diameter, etc., and the dimensional accuracy can be secured. An electric motor stator core can be provided.

[Brief description of the drawings]

FIG. 1 is a plan view of a stator core of a motor according to a first embodiment of the present invention after press-fitting a split yoke core and a tooth core.

FIG. 2 is a plan view of the split yoke core according to the first embodiment of the present invention;

FIG. 3 is a perspective view after laminating the split yoke portion core of the first embodiment of the present invention.

FIG. 4 is a plan view of the split yoke core of the second embodiment of the present invention.

FIG. 5 is a perspective view of the split yoke portion core according to the second embodiment of the present invention after lamination.

FIG. 6 is a plan view after press-fitting the divided yoke core and the tooth core according to the second embodiment of the present invention.

FIG. 7 is a partially enlarged plan view after press-fitting of the divided yoke core and the tooth core according to the third embodiment of the present invention.

FIG. 8 is a plan view of a yoke core of a stator core of a conventional motor.

FIG. 9 is a plan view after press fitting of a conventional iron core and a tooth core.

FIG. 10 is a partially enlarged plan view of a conventional joint iron core and a tooth core after press-fitting.

FIG. 11 is a perspective view of a conventional toothed iron core.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Rotor hole 2 Tooth core 5 Split yoke core (1 slot division) 6 Tooth core fitting part 7 Yoke fitting part 7a Yoke fitting part concave part 7b Yoke fitting part convex part 8 Split yoke iron core (divided into multiple slots) 9 R-shaped engaging part

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-1-303029 (JP, A) JP-A-48-102204 (JP, A) JP-A-2-44848 (JP, U) JP-A 54-102 9303 (JP, U) Actually open 56-96855 (JP, U) (58) Fields investigated (Int. Cl. ⁶ , DB name) H02K 1/18 H02K 15/02

Claims (3)

(57) [Claims] 1. A tooth core having a plurality of substantially I-shaped teeth on which a winding conductor is wound radially around a rotor hole into which a rotor is inserted, and an outer periphery of the tooth core. The yoke core is press-fitted to form a magnetic path, and the yoke core is divided by the same number as the number of slots at a non-fitting portion with the tooth core, and the divided surface is A stator core for an electric motor, which is punched and laminated with press-fitting engagement surfaces between the yoke cores and is formed by fitting the divided yoke cores together to form a ring. 2. A yoke core is divided into two or more slots at a non-fitting portion with a tooth core, and
2. The stator core for an electric motor according to claim 1, wherein the split surfaces are formed by stamping and laminating with press-fitting surfaces of the yoke cores, and the split yoke cores are formed in a ring shape by fitting each other. . 3. The planar shape of a fitting portion between the substantially I-shaped toothed iron core and the split yoke portion and a fitting portion between the split yoke portions each have an engaging shape. The stator core of the motor described.