JPH0739316Y2 - Small motor stator structure - Google Patents

Description

[Detailed description of the device]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention constitutes a stator by connecting two stator assembly units each of which is composed of a small electric motor, in particular, an annular coil and a magnetic path constituting member surrounding the annular coil. The present invention relates to a stator structure of a small electric motor.

[0002]

2. Description of the Related Art FIGS. 4 to 6 show a front view, a side view and a sectional view of a stator according to an example of the prior art. As seen in the cross section of FIG. 6, the annular coil 4 and the case 2 and the pole 3 in which magnetic poles are formed in the inner cylindrical portions surrounding the annular coil 4 respectively.
And a rotor (not shown) rotatably rotatably supported by a gap in the inner peripheral surface of the stator. In the case of a small electric motor, especially when the mounting environment is in a high humidity environment, a structure in which the entire stator is resin-cast is used to prevent insulation deterioration of the current-carrying part.

As a means for fixing and holding the two stator assembly 1 to each other when such a structure is required,
When the internal space is filled with the resin 5, a plurality of holes 2-3 are formed in the axially outer end surface 2-4 of each case 2 to form the holes 2-
3 is also integrally filled with the resin 5, and further, the neck portion of the solidified protrusion 5-1 is formed by projecting to the outer surface of each end surface 2-4, so that the two stator portion assemblies 1 are mutually integrated. The structure was adopted to have the function of holding and fixing.

However, the neck portion of the resin protrusion 5-1 having the function of fixing and holding the two stator portion assemblies 1 is as shown in the figure.
Since they are located on the opposite sides with respect to each other, the distance: L1 is naturally large by a length corresponding to the axial total trawl method of the two stator assembly 1, and as is well known, the thermal expansion coefficient of the resin is In addition, it is unavoidable that the dimensional change amount due to cold and heat also becomes large in combination with the fact that it is larger than that of the intervening annular coil 4, the case 2, the pole 3 and the like.

[0005]

As described above, in the structure of the prior art, the neck portion of the resin protrusion 5-1 for fixing and holding the two stator assembly 1 by the repeated heat generation and cooling due to the interruption of the electric current. Since the stress applied to it is large and it contains the risk of accidents such as breakage, special consideration is required, such as rounding the corners of holes 2-3 and enlarging the holes to ensure the strength of the location. I had such a problem.

[0006]

SUMMARY OF THE INVENTION In order to solve the above problems, the present invention has a structure in which two stator assembly parts are fixedly held, so that the outer cylindrical parts of the two opposing case parts are connected to each other. A plurality of holes are formed on the outer peripheral surface, and the holes are also filled with resin together with the inside.

[0007]

[Operation] In the above configuration, since both resin protrusions that fix and hold the two stator parts assemblies are arranged close to each other, stress due to cold and heat is reduced, and a fix and hold function is provided. The risk of damage is eliminated.

[0008]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 3 shows a cross section of the example, in which the resin 5 injected
However, both cases 2 of the two stator part assemblies 1 connected to each other
The holes 2-2 respectively provided on the outer peripheral surfaces of the outer cylindrical portions are also integrally filled to form the protrusions 5-1. As shown in FIGS. 3 and 6 and FIGS. 2 and 5, there is no difference between the structure of the prior art and the structure of the invention of the lead wire lead-out portion 5-2, but FIG. Arrangement of a hole 2-2 provided in the outer peripheral surface of the case for fixing and holding both of the two stator assembly 1 and a resin projection 5-1 filled therein as a front view as seen from the side of the drawing portion 5-2. Is shown.

The two stator assemblies 1 connected to each other integrally fix the annular coil 4, the case 2 and the pole 3 with resin, and are fixedly held to each other by the protrusions 5-1 of both resins. However, as shown in the figure, the protrusions 5-1 of the both resins are provided in parallel with each other on the outer peripheral surface of the case 2 in the radial direction, and are fixed and held. And are provided close to each other, and there is no neck of the protrusion 5-1. That is, the distance between the protrusions 5-1 of both resins shown by L2 in FIGS. 1 and 3 is much smaller than that of L1 of the example of the prior art, and the resin that corresponds to changes in cold and heat is The degree of expansion and contraction is reduced. This means that the stress applied to the resin protrusions 5-1 is reduced, and there is no risk of the resin protrusions 5-1 both holding and fixing the two stator assembly 1 being broken. means.

[0010]

EFFECT OF THE INVENTION Since the stator according to the present invention has the structure as described above, the risk that a large stress due to cold or heat is applied to the resin protrusion that connects and holds two sets of stators together is reduced. However, it is possible to obtain a highly reliable fixing means without danger of destruction without requiring special consideration.

[Brief description of drawings]

FIG. 1 is a front view of an embodiment of the present invention viewed from a lead wire lead-out portion side.

2 is a side view of the example of FIG. 1. FIG.

3 is a cross-sectional view of FIG.

FIG. 4 is a front view of an example of a conventional technique as viewed from a lead wire drawing portion side.

5 is a front view of the example of FIG.

6 is a cross-sectional view of FIG.

[Explanation of symbols]

 1: Stator part assembly 2: Case 2-1: Outer cylindrical part of case 2-2: Hole provided on outer peripheral surface of outer cylindrical part of case 2-3: Hole provided on axially outer end face of case 2 -4: Axial outer side end face of case 3: Pole 4: Annular coil 5: Resin filled inside 5-1: Projection part of resin 5-2: Lead wire drawing portion 6: Lead wire

Claims (1)

[Scope of utility model registration request] 1. A case having a U-shaped cross section and a magnetic pole formed on its inner cylindrical portion, a pole having a pair of magnetic poles facing the magnetic pole of the case, and a circle surrounded by the case and the pole. A stator integrally fixed by arranging two stator part assemblies each having an annular coil so that the open ends of the case are opposed to each other and filling the internal spaces thereof with resin, and In the structure of the stator of a small electric motor in which a rotor rotatably supported by a peripheral air gap is arranged, a plurality of holes are formed on the outer peripheral surfaces of the outer cylindrical portions of the two cases facing each other. A stator structure for a small electric motor, characterized in that the holes are also filled with the resin, and two stator assembly parts are integrally fixed.