JPH09172749A - Molded motor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To protect drive circuit parts easily from flow pressure in molding a thermosetting resin by fixing electronic parts mounted on a printed board, to the printed board through an electronic part protective member having a recess in nearly the same form. SOLUTION: An aluminum electrolytic capacitor 12 is fixed by solder into the two holes provided separately from the holes for mounting of an electronic part protective member 13 at the printed board 4, together with the electronic part protective member 13 which is a resin molded item having a recess of roughly the same size as its outside diameter and has two metallic pins 13a. Hereby, an inexpensive aluminum electrolytic capacitor 12 can be used without damage, and also the fixation to the printed board 4 of the electronic part protective member 13 can be made easily by soldering or thermal pressure bonding, so the productivity and work efficiency can be improved.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention mainly relates to a molded motor for driving an indoor fan of an air conditioner,
In particular, the present invention relates to a protection structure for electronic components built in a stator.

[0002]

2. Description of the Related Art In recent years, it has become mainstream to control the capacity of a compressor in an air conditioner such as a home air conditioner. Corresponding to this, it is required to widely adjust the amount of air blown to the heat exchanger in multiple stages and to reduce the input, and instead of the induction motor as the fan drive system that has been conventionally used to satisfy these demands. A method of operating a brushless motor, which is easy to adjust speed and highly efficient, with a DC power supply is adopted. In addition, in response to consumer demand for reduction of noise and vibration, the demand for so-called molded motors, which form a motor frame by molding and solidifying thermosetting resin having electrical insulation instead of the conventional steel plate frame, has increased. There is. Demand for mold-type brushless electric motors, which combine the advantages of both, is increasing rapidly. At this time, since the driving circuit is embedded in the stator, the element moves with respect to the fluid pressure during molding of the thermosetting resin, and thus the root of the element and the lead are easily damaged, for example, an electrolytic capacitor, It is necessary to embed transistors etc. and protect them.

FIG. 7 shows a perspective view of a protective structure of a conventional example as a representative of the protective structure of an aluminum electrolytic capacitor. In FIG. 7, the aluminum electrolytic capacitor 12 mounted on the printed circuit board 4 by soldering does not soften at about 150 ° C. during molding of the thermosetting resin forming the motor frame and has high heat resistance,
Moreover, the aluminum electrolytic capacitor 12 is fixed with an epoxy adhesive 18 having a high viscosity capable of covering it.

[0004]

However, the above-mentioned conventional configuration has the following problems.

[0005] 1. Adhesives with strong heat resistance and high viscosity generally require a drying oven that has a high curing temperature and is suitable for the number of units produced and the size of the product.

[0006] 2. The adhesive having a short curing time has a short usable time, a large amount of the adhesive is discarded, and the cost is high.

[0007] 3. Adhesive application and drying time are required, resulting in poor productivity and workability. 4. Since the adhesive cannot be applied uniformly, there is a risk of interfering with other structural parts, and in order to avoid it, it is necessary to take a large printed circuit board space in advance, resulting in a large motor shape.

SUMMARY OF THE INVENTION The present invention solves the above-mentioned conventional problems, and an object of the present invention is to provide a molded motor which can easily protect drive circuit components from a fluid pressure during molding of a thermosetting resin.

[0009]

In order to achieve this object, the present invention has a projection having a recess having substantially the same shape as that of an electronic component mounted on a printed circuit board, positioning the printed circuit board, and mounting and fixing the same. The electronic component is fixed to the printed circuit board via the electronic component protection member.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The invention according to claim 1 of the present invention comprises a stator core, a winding wound around the stator core via an insulating layer, a position sensor and a drive circuit component. In a molded motor having a mounted printed circuit board, each of the parts is generally molded and solidified with a thermosetting resin having electrical insulation, and embedded in the resin, an electronic component mounted on the printed circuit board is substantially omitted. It is fixed to a printed circuit board via an electric component protection member having a recess of the same shape, and a stator core in which windings are wound via an insulating layer,
When integrally molding a position sensor and a printed circuit board on which a drive circuit component is mounted with a thermosetting resin having electrical insulation properties, it is possible to prevent electronic components from moving due to pressure caused by the flow of the thermosetting resin. Therefore, the vicinity of the root of the lead wire of the electronic component can be protected from damage.

According to a second aspect of the present invention, in the first aspect of the invention, the electronic component protection member has a plurality of projections for positioning and fixing to the printed circuit board. It has an effect that it can be easily positioned and fixed to the printed circuit board.

According to a third aspect of the present invention, in the first aspect of the invention, the projection of the electronic component protecting member is formed by a metal pin, and the metal material is copper, brass, tin-plated material, or the like. The use of a solderable material has the effect that the electronic component protection member can be fixed to the printed circuit board at the same time when the terminals of the electronic component are connected to the printed circuit board by soldering.

An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is an assembly diagram of a stator winding of a brushless motor of the present invention. In FIG. 1, the stator core 1 is composed of laminated iron plates, and the core insulation 2 is the stator core 1.
It is formed by integral molding with or by inserting the molded product into the iron core. Tooth portion 1 of stator iron core 1 provided with iron core insulation 2
The winding 3 is wound around a. At this time, the shroud portions 2a and 2b of the iron core insulation 2 prevent the winding 3 from collapsing, and at the same time, the inner surface of the shroud portion 2a is provided with a groove 2c for inserting the sensor fixing base 8. On the other hand, the printed circuit board 4 is formed in a substantially donut shape while having a winding hooking groove 4a and a winding end winding protrusion 4b on the outer periphery thereof, while the main parts of the driver IC 5, power transistor arrays 6a and 6b are formed. The three parts are arranged in a substantially equal pitch and in a substantially radial pattern.

The position sensor 7 using a hall element is inserted into a sensor fixing base 8 formed to have an electrical angle of 120 degrees, and is mounted on the printed circuit board 4 together with the sensor fixing base 8. In addition, the small signal transistor 9, the fixed resistor 10 and the jumper wire 11 are also respectively provided on the printed circuit board 4
Attached to. Further, the aluminum electrolytic capacitor 12 is a resin molded product having a recess having substantially the same size as the outer diameter of the aluminum electrolytic capacitor 12, and is mounted on the printed circuit board 4 together with the electronic component protection member 13 having two metal pins 13a. Further, in order to hold the printed circuit board 4 in a fixed position in the mold at the time of resin molding and to insert a metal pin for forming a hole for inserting a through bolt or a rivet at the time of assembling the electric motor after molding, the printed circuit board 4 is inserted. Hole 4c
Is provided.

Further, a lead wire group 14 for supplying power is attached to the printed circuit board 4, and a lead bush 15 for protecting the lead wire group 14 from heat and pressure during resin molding is attached to the lead wire group 14. Fixed. At this time, a positioning hole 4d for the core insulation 2 is also provided.

2 and 3 are state diagrams of an electronic component protection structure according to one embodiment. In FIG. 2, the printed circuit board 4
In addition to the lead for the aluminum electrolytic capacitor 12, two mounting holes for the electronic component protection member 13 are provided, and they are fixed to the printed circuit board 4 with solder 17 in FIG.

The stator core 1 with windings and the printed circuit board 4 with components mounted as described above have shroud portions 2a and 2b and adjacent shroud portions as shown in the side view of completed winding in FIG. The driver IC 5 and the power transistor arrays 6a and 6b are located between the two, and they are combined so that the axial end of the shroud portion is brought into contact with the printed circuit board surface to form the stator winding completed product 16.

FIG. 5 is a perspective view of this state. The winding end 3a is hooked in the winding hooking groove 4a of the printed circuit board 4, then wound around the winding end winding protrusion 4b, and fixed by energizing with solder or the like. ing.

In FIG. 5, printed wiring on the surface of the printed circuit board and lead holes for drive circuit parts are not shown. The stator winding finished product 16 configured as described above is resin-molded.

The metal pin 1 of the electronic component protection member 13
When 3a is a resin molded product, it can be fixed to the printed circuit board 4 by thermocompression bonding or the like, and an electronic component protection structure can be obtained as shown in FIG. The same effect can be obtained even if the electronic component protection member 13 is made of metal.

[0021]

As described above, the following effects can be obtained by the configuration of the present invention.

1. Inexpensive aluminum electrolytic capacitors can be used without damage. 2. The protection member can be easily fixed to the printed circuit board by soldering or thermocompression bonding, which improves productivity and workability.

3. Regarding the fixing of the protective member, there is no variation in work, and the quality is improved.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view of a stator winding assembly according to an embodiment of the present invention.

FIG. 2 is an exploded perspective view showing a protective structure for an aluminum electrolytic capacitor according to an embodiment of the present invention.

FIG. 3 is a sectional view of an electronic component protection structure for an aluminum electrolytic capacitor according to an embodiment of the present invention.

FIG. 4 is a side view of the stator winding assembly according to the embodiment of the present invention.

5 is a perspective view of the stator winding assembly of FIG. 4 according to one embodiment of the present invention.

FIG. 6 is a sectional view of an aluminum electrolytic capacitor protection structure according to a second embodiment of the present invention.

FIG. 7 is a perspective view of a conventional electronic component protection structure.

[Explanation of symbols]

 1 Stator Iron Core 1a Tooth Part 2 Iron Core Insulation 2a, 2b Shroud Part 2c Groove 3 Winding 4 Printed Circuit Board 4a Winding Hooking Groove 4b Winding End Winding Protrusion 4c Hole 4d Positioning Hole 5 Driver IC 6a, 6b Power Transistor Array 7 Position sensor 8 Sensor fixing base 9 Small signal transistor 10 Fixed resistor 11 Jumper wire 12 Aluminum electrolytic capacitor 13 Electronic component protection member 13a Metal pin 14 Lead wire group 15 Output bush 16 Stator winding finished product 17 Solder 18 Adhesive

Claims (3)

[Claims] 1. A stator core, a winding wound around the stator core via an insulating layer, a printed circuit board on which a position sensor and components for an electric circuit are mounted, and each of the parts is electrically insulated. In a mold motor integrally molded and solidified with a thermosetting resin, and embedded in the resin, an electronic component mounted on the printed circuit board is printed through an electronic component protection member having a recess of substantially the same shape. Molded motor fixed to the board. 2. The molded motor according to claim 1, wherein the electronic component protection member has a plurality of projections for positioning and fixing to the printed circuit board. 3. The molded motor according to claim 1, wherein the projection of the electronic component protection member is composed of a metal pin.