JP3600730B2 - Motor stator structure - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a motor stator structure in which the inside and the surface of a stator core are molded with resin.
[0002]
[Prior art]
As shown in FIG. 15, in the stator of the electric motor, a winding installation space b formed inside a stator core a is molded with a resin c for the purpose of increasing the adhesion of the windings and improving the thermal conductivity of the windings. It is common.
Further, in order to improve the coating of the stator and the sealing property of the stator, the surface of the stator core a is molded with a thin resin c.
[0003]
However, since the resin c on the surface of the stator core a is very thin, there is a possibility that the resin c will peel off or be displaced when subjected to an impact. In particular, when the surface area of the stator core a is large, the tendency becomes stronger.
In addition, in order to make the resin c on the surface of the stator core a thin, the gap between the mold and the stator core a must be set very small. As a result, the injected resin c becomes difficult to flow, The resin c may not spread all over the surface of the stator core a.
[0004]
Further, when assembling the stator core a and the housing, a rod or a pin is erected from the housing so as not to be displaced by an external force before screwing, and a hole for inserting the rod or the pin into the stator core a is formed. a and the housing were positioned.
For this reason, not only is a positioning member such as a rod or a pin required, but also there is a disadvantage that it takes time and effort to mount the positioning member.
[0005]
[Problems to be solved by the invention]
An object of the present invention is to provide a stator structure of an electric motor in which the resin on the surface of the stator core is less likely to peel or displace, the resin easily flows during molding, and the entire surface of the stator core is uniformly covered with the resin. To provide.
[0006]
[Means for Solving the Problems]
The stator structure of the electric motor according to the present invention is formed by molding the inside and the surface of the stator core with a resin, forming a groove on the surface of the stator core along the axial direction, and fitting the resin on the surface of the stator core into the groove.
The configuration in which the groove is formed and the resin is molded increases the contact area between the stator core and the resin, thereby preventing the resin from peeling off and preventing the displacement. In addition, the resin flows smoothly through the groove and spreads over the entire surface of the stator core.
Further, the groove is formed as a positioning portion by fitting with a projection provided on the stator core mounting surface of the housing, and when assembling the stator core and the housing, a rod, a pin and the like for positioning the both are not required.
It is preferable that the width of the groove is larger at the back than at the opening.
With this configuration, the portion where the resin fits into the groove functions as a retaining portion, and the adhesion between the stator core and the resin on its surface is further enhanced.
[0007]
With the configuration in which the groove is formed along the axial direction, when the mold resin is poured from the axial end face of the stator core, the fluidity of the resin is improved.
Also, in cross-section, so as to form parallel openings near the opposite sides of the groove may be wider than the parallel portion thereof back portion. When the projection of the housing is square, it is easy to fit it.
[0008]
It is possible to form a stator core by laminating a plurality of plates in the axial direction, to form a notch on the surface of the plate, and to form a groove by laminating the notches.
With the configuration in which the groove is formed along the circumferential direction, when the mold resin is poured from the side surface of the stator core, the resin easily flows.
Further, a plurality of plate members are laminated in the axial direction to form a stator core, and the diameter of some plate members is made smaller than the diameter of the other plate members, and a circumferential groove is formed outside the small-diameter plate member. It may be formed.
[0009]
BEST MODE FOR CARRYING OUT THE INVENTION
1 to 4 show a first embodiment of the present invention.
As shown in FIGS. 1 and 2, a stator 1 of an electric motor has a stator core 2 having a rotor insertion hole 3 formed in a central portion.
Inside the stator core 2, winding installation spaces 4 are formed at appropriate intervals along the circumferential direction. In the winding installation spaces 4, windings (not shown) are provided, and a resin 5 is molded and wound. The wire is fixed, and the number of fixed magnetic poles corresponding to the magnetic poles of the rotor (not shown) installed in the rotor insertion hole 3 is formed.
[0010]
One or more grooves 6 are formed on the surface of the stator core 2 along the axial direction. As shown in FIG. 3, the groove 6 is a dovetail groove having a deeper width than a width of the opening.
The groove 6 can be formed by cutting the surface of the stator core 2. Further, as shown in FIG. 11, the stator core 2 is formed by laminating a plurality of plate members 2a, so that notches 7 having the same shape as the cross section of the groove 6 are provided on the surface of each plate member 2a. When the plate members 2a are stacked so that the notches 7 coincide with each other, the groove 6 may be formed by the notches 7 that are continuous in the axial direction.
[0011]
Further, the front surface of the stator core 2 is molded with the resin 5, and the back surface of the thin resin 5 is fitted into the groove 6.
The fitting portion 10 of the resin 5 into the groove 6 has the same shape as the cross section of the groove 6, that is, the width of the tip is wider than the width of the base portion, and the portion 10 is caught by the opening of the groove 6 and functions as a retaining portion. The resin 5 can be prevented from peeling off from the surface 2.
[0012]
In order to mold the winding installation space 4 and the surface inside the stator core 2 with the resin 5, the stator core 2 is placed in a slightly larger mold, and the molten resin 5 is injected from one axial end surface thereof.
Then, the resin 5 enters into the winding installation space 4 and the narrow gap between the mold frame and the stator core 2 from one axial end face thereof, and as shown by the arrow in FIG. The resin 5 flowing smoothly goes around the surface of the stator core 2 and spreads evenly over the entire surface of the stator core 2.
[0013]
As shown in FIG. 4, the groove 6 on the surface of the stator core 2 is fitted with a dovetail tenon 9 formed on the stator core installation surface of the housing 8 when the stator 1 is automatically assembled. 8 and a positioning part of the stator core 2.
Therefore, it is not necessary to attach a separate positioning member such as a rod or a pin for positioning the housing 8 and the stator core 2.
The resin molding on the surface of the stator core 2 is performed after the stator core 2 and the housing 8 are assembled.
[0014]
FIG. 5 shows a second embodiment of the present invention.
A groove 6 having a substantially circular cross section is formed on the surface of the stator core 2 along the axial direction. Other configurations are almost the same as those of the first embodiment.
To position the stator core 2 and the housing 8, as shown in FIG. 6, a projection 9 having a circular cross section is formed on the stator core installation surface of the housing 8, and the projection 9 is fitted into the groove 6.
[0015]
FIG. 7 shows a third embodiment of the present invention.
On the surface of the stator core 2, a groove 6 is formed along the axial direction, in which the opposite sides of the opening are parallel to each other, and the depth is wider than the parallel part.
In order to position the stator core 2 and the housing 8, as shown in FIG. 8, a rectangular projection 9 having substantially the same width as the width of the parallel portion of the groove 6 is formed on the stator core installation surface of the housing 8. And the groove 6 may be fitted. With such a shape, the corners on both sides of the back portion of the projection 9 can be easily inserted into the groove 6, so that the fitting between the stator core 2 and the housing 8 becomes easy.
[0016]
9 and 10 show fourth and fifth embodiments of the present invention.
The cross-sectional shape of the groove 6 can be triangular as shown in FIG. 9 or rectangular as shown in FIG. Since these grooves 6 are not wider at the back than at the opening as in the first to third embodiments, the effect of preventing the fitting portion 10 formed on the back surface of the resin 5 from peeling off is reduced. Although slightly inferior, the contact area between the resin 5 and the surface of the stator core 2 can be increased to suppress peeling and prevent the resin 5 from being displaced in the circumferential direction.
In any of these cases, a projection 9 having substantially the same cross-sectional shape as the groove 6 is formed on the stator core installation surface of the housing 8, and the groove 6 and the projection 9 are fitted to form a positioning portion. .
[0017]
11 and 12 show sixth and seventh embodiments of the present invention.
In the sixth embodiment shown in FIG. 11, a plurality of plates 2a each having a notch 7 on the surface are stacked to form the groove 6 in the axial direction as described above. The direction of the groove 6 is not limited to the axial direction. As shown in FIG. 12, a notch 7 is formed on the surface of each plate 2a constituting the stator core 2, and the plate 2a is formed so that the notch 7 is obliquely continuous. May be formed on the surface of the stator core 2 to form a groove 6a inclined with respect to the axial direction.
FIG. 13 shows an eighth embodiment of the present invention.
As shown in FIG. 13, it is possible to make the diameter of some plate members 2b smaller than the diameter of other plate members 2a, and to form a groove 6b along the circumferential direction outside the small-diameter plate member 2b. . In this way, when a hole is formed in the side surface of the mold and a molten resin is injected from the hole to form a resin film on the surface of the stator core 2, the fluidity of the resin is increased, and the entire surface of the stator core 2 is increased. Is evenly distributed.
[0018]
FIG. 14 shows a ninth embodiment of the present invention.
As shown in FIG. 14, a groove 6 along the axial direction and a groove 6b along the circumferential direction can be formed on the surface of the stator core 2 in combination.
It is also possible to cut the surface of the stator core 2 to form the inclined groove 6a and the circumferential groove 6b.
[0019]
【The invention's effect】
According to the configuration of the first aspect, the contact area between the surface of the stator core and the resin on the surface is widened, so that the resin is hardly peeled off, and the fitting portion into the groove serves as a stopper, and the periphery of the resin is formed. The displacement in the direction is regulated.
In addition, when resin is injected into the narrow gap between the mold and the stator core surface, the resin flows smoothly through the groove and flows around the stator core surface, so that the resin spreads uniformly over the entire surface of the stator core in a short time. No unevenness occurs.
[0020]
According to the configuration of the second aspect, on the back surface of the resin on the surface of the stator core, the portion fitted into the integrally formed groove is not caught by the opening of the groove, so that the stator core and the resin on the surface thereof are not removed. And the adhesion to the film is further increased.
According to the configuration of the third aspect, when the resin is injected from the axial end face, the fluidity of the resin is increased, and the resin molding on the stator core surface can be performed easily and uniformly.
[0021]
According to the configuration of the fourth aspect, in the step of assembling the stator core and the housing, since the groove of the stator core also serves as the positioning portion, it is necessary to mount a separate positioning member such as a rod or a pin for preventing the two from being displaced. Therefore, not only the structure is simplified, but also the assembling labor is simplified.
According to the configuration described in claim 7, when the resin is injected from the side surface of the mold, the fluidity of the resin is improved, and the resin molding on the stator core surface can be performed smoothly and uniformly.
[Brief description of the drawings]
FIG. 1 is a perspective view of a main part of a stator of an electric motor according to a first embodiment of the present invention. FIG. 2 is a perspective view illustrating a flow of resin in the same. FIG. FIG. 5 is a perspective view of a fitting portion of the electric motor according to the second embodiment of the present invention; FIG. 5 is a sectional view of a main part of a stator of the electric motor according to a second embodiment of the present invention; 7 is a sectional view of a main part of a stator of an electric motor according to a third embodiment of the present invention. FIG. 8 is a perspective view of a fitting portion with a housing of the motor according to the third embodiment. FIG. 9 is an electric motor showing a fourth embodiment of the present invention. FIG. 10 is a cross-sectional view of a main part of a stator of an electric motor showing a fifth embodiment of the present invention. FIG. 11 is a perspective view of a main part of a stator core according to a sixth embodiment of the present invention. FIG. 12 is a side view of a main part of a stator core according to a seventh embodiment of the present invention. FIG. 13 is an eighth embodiment of the present invention. Ninth partial perspective of a stator core according to Embodiment Figure 15 partial perspective view of a conventional motor stator [code Description] in partial perspective [14] The present invention of a stator core according to
DESCRIPTION OF SYMBOLS 1 Stator 2 Stator core 2a, 2b Plate 3 Rotor insertion hole 4 Winding installation space 5 Mold resin 6, 6a, 6b Groove 7 Notch 8 Housing 9 Projection 10 Fitting part

Claims (6)

In a stator of an electric motor , in which the inside and the surface of a stator core are molded with resin, and a stator core and a housing are assembled, a groove is formed in the surface of the stator core along an axial direction, and the resin on the surface of the stator core is fitted into the groove. It is allowed Rutotomoni, stator structure of the motor, characterized in that to constitute a positioning unit by fitting a projection provided on the stator core installation surface of the groove and the housing. 2. The stator structure for an electric motor according to claim 1, wherein the width of the groove is greater at a depth than at an opening. 3. In cross-section, so as to form parallel openings near the opposite sides of the groove, a stator structure of the motor according to its inner portion to claim 1 which is wider than the parallel portion. A plurality of plate members together constitute the stator core by laminating in the axial direction, the plate surface to provide a cut-out, by laminating a notch according to any one of claims 1 to 3 to form the grooves Stator structure of electric motor. The stator structure of an electric motor according to any one of claims 1 to 4, wherein a groove is formed along a circumferential direction. A plurality of plate bodies with laminated axially forming the stator core, the diameter of the part of the plate body and smaller than the diameter of the other plate member, according to claim 5 having grooves on the outside of the small diameter of the plate body The stator structure of the electric motor according to 1.

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