JPH0777503B2 - Electric motor stator and manufacturing method thereof - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a stator of a mold type electric motor with a built-in electronic component used as a blower fan drive source and a manufacturing method thereof.

2. Description of the Related Art In recent years, there has been a strong demand for an electric motor for a blower fan that has a speed control function, and many electric motors that use electronic parts for speed control have been increasing. In addition, there is a strong demand for a lighter, thinner, shorter, and smaller electronic circuit, and more and more electronic circuits are resin-molded and built into electric motors.

Hereinafter, a conventional stator of a motor incorporating these electronic components by resin molding will be described with reference to FIG.

In FIG. 5, reference numeral 51 designates a stator core formed by stacking iron plates. The stator core 51 is provided with an iron core insulation 52, and a coil 53 is wound around the stator core 51 via the iron core insulation 52. There is. Then, a printed circuit board 54 provided with a speed control circuit component is arranged at one end of the iron core insulation 52, and the stator iron core 51 and the iron core insulation are provided.
52, coil 53, and printed circuit board 54 were integrally molded with resin 55. The stator constructed in this way is used for molding the stator core 51, core insulation 52, coil
53, the printed circuit board 54 was placed in the space formed by the upper mold 56 and the lower mold 57, and the resin 55 was injected into the space and molded. At this time, the printed circuit board 54 is placed on the pin 56 of the upper die 56.
The position is regulated so that the a, 56b and the pin 57a of the lower mold 57 press the resin 55 and the resin 56 does not deviate from the installation position due to the fluid pressure.

Problems to be Solved by the Invention The conventional configuration and manufacturing method described above have the following problems.

(1) If the area of the printed circuit board 54 is small, it is difficult to secure the area for fixing by fixing the upper and lower molds 56, 57 with the pins 56a, 56b, 57a, so that it cannot be securely fixed and becomes unstable. .

(2) Since the upper and lower molds 56, 57 are provided with the pins 56a, 56b, 57a, the mold cost is high and the cost is increased.

(3) The part of the printed circuit board 54 supported by the pins 56a, 56b, 57 of the upper and lower molds 56, 57 cannot be covered with the resin 55, so it will be exposed to the outside air, and it will be used in a high humidity place. Not suitable for.

The present invention solves such problems and provides a stator of an electric motor that can reduce the manufacturing cost.

Means for Solving the Problems In order to solve the above-mentioned conventional problems, the present invention provides a protrusion on an insulating layer located on an axial end face of a stator core, and a printed circuit board between the protrusion and the protrusion. A bracket for clamping is provided, and the stator core, the printed circuit board and a part of the bracket are integrally molded with resin. When the resin is molded, the bracket and the protruding part clamp the printed circuit board. It is to be placed in the mold.

Effect of the Invention According to the above configuration and manufacturing method of the present invention, the printed circuit board can be sandwiched between the protrusion and the bracket, and a special holder for holding the printed circuit board during integral molding with resin can be omitted. Therefore, the entire printed circuit board can be covered with the resin.

Embodiment Hereinafter, one embodiment in which the present invention is applied to a phase control induction motor will be described in detail with reference to the drawings.

FIG. 1 is an assembly view of a main part of a stator in an embodiment of the present invention. In the figure, reference numeral 1 denotes a printed circuit board. The printed circuit board 1 is mounted with an electronic component 2 and is brought into contact with a protrusion 5 made of an insulating layer 4 provided on a stator core 3 as well as a bracket 6 and a protrusion 5. Sandwiched between. The bracket 6 is provided with a recess 6a cut into a shape most suitable for pressing the printed board 1 against the protrusion 5. The recess 6a has a shape that does not interfere with the solder or pattern of the printed circuit board.

The electronic component 2 is arranged on the side of the protrusion 5 in the insulating layer 4a, and a coil (not shown) is wound around the insulating layer 4.

FIG. 2 is an assembled cross-sectional view of the main part of the stator. In this state, the resin material is integrally molded, so that it is inserted into the molding die.

FIG. 3 is a layout view in the molding die, and the printed circuit board 1 is sandwiched by the bracket 6 and the projection portion 5 and is firmly fixed when the upper die 7 and the lower die 8 are closed. Then, the resin 9 is injected into the upper and lower molds 7 and 8 and molded.

FIG. 4 is a partial perspective view of a printed circuit board of a finished stator, which is integrally molded with a resin material, in a fixed state. The bracket 6 prevents the central portion of the printed circuit board 1 from being pressed by the recessed portion 6a, and holds the end of the printed circuit board 1. The printed board 1, the electronic component 2, the stator core 3, the insulating layer 4, the coil, and a part of the bracket 6 are integrally molded and fixed with the resin 9.

EFFECTS OF THE INVENTION As is apparent from the above description, according to the present invention, the printed circuit board is configured to be sandwiched between the protrusion of the insulating layer and the bracket, and the printed circuit board is sandwiched between the protrusion and the bracket and placed in the mold. By placing and resin molding
The following effects can be obtained.

(1) Even when the area of the printed circuit board is small, the printed circuit board can be securely fixed, and the printed circuit board can be fixed more easily than the conventional one.

(2) Since the entire printed circuit board can be covered with the resin and the printed circuit board and the outside air can be completely cut off, the reliability against moisture and the like can be increased.

(3) It is not necessary to dispose pins for fixing the printed circuit board on the upper and lower molds, and the manufacturing cost can be reduced.

[Brief description of drawings]

FIG. 1 is an assembly view of a main part of a stator of an electric motor in one embodiment of the present invention, FIG. 2 is a longitudinal sectional view of a main part of the stator, and FIG.
The figure is a cross-sectional view of the main part showing the arrangement of the stator in the mold for molding, FIG. 4 is a partial perspective view of the main part of the stator, and FIG. 5 is the resin molding of the stator of the conventional electric motor. It is sectional drawing which shows a state. 1 ... Printed circuit board, 2 ... Electronic component, 3 ... Stator core, 4 ... Insulating layer, 5 ... Projection part, 6 ... Bracket,
9 ... Resin.

Claims (2)

[Claims] 1. A stator core provided with a winding via an insulating layer, and a printed circuit board connected to the winding, wherein a protrusion is formed on the insulating layer located on an axial end face of the stator core. And a bracket for sandwiching the printed circuit board between the projecting portion and the stator core of the motor, the printed circuit board and a part of the bracket being integrally molded with resin. 2. A printed circuit board connected to a winding provided on a stator core via an insulating layer is brought into contact with a protrusion provided on an insulating layer located on an end face in the axial direction of the stator core, and A stator of an electric motor, which is placed in a mold in a state where the printed circuit board is sandwiched between a bracket that holds a bearing and the protrusion, and the stator core, the printed circuit board and a part of the bracket are molded with resin. Manufacturing method.