JPH0612937B2 - Electric motor - Google Patents

Description

The present invention relates to an electric motor configured so as to facilitate rationalization such as assembling a relatively small electric motor by a machine, and to simplify the structure to achieve high reliability and low cost. .

In the manufacture of an electric motor, a winding is provided inside, and generally, a large number of winding ends are drawn out for speed change and a connection with an external power source is made.

And this winding becomes thinner as the electric motor becomes smaller,
Since the mechanical strength of the winding is lowered, a difficult problem arises in connection with the power supply.

That is, if the winding becomes thin, the wire is easily broken, resulting in a high defect rate in manufacturing and a problem in reliability.

Also, if the number of winding ends increases, connection mistakes often occur, and in order to prevent such mistakes,
There have been cases where time-consuming measures such as color-coding the windings or conducting tests during the assembly process have been taken.

Such a problem is that when a 200 V power source is used in a small electric motor, the winding becomes thinner, which makes it more difficult to manufacture the electric motor. It has been desired to configure so as not to cause wire breakage.

Also, in the case of molding the stator core with resin, the resin that is molded during molding will push the winding ends, so the floating winding ends should be as short as possible and mechanical strength should not be insufficient. Had to be configured.

For this reason, in the past, in order to increase the mechanical strength of the winding even in a small electric motor, it was considered to reduce the occurrence of defects by using a considerably thick winding, and as a result, the electric motor was unnecessarily enlarged. There were problems such as high manufacturing prices.

In particular, in the case of treating the electric motor with a resin mold so as to cover it with a resin, the winding is often flowed and broken, and even if a defect is found after the molding, the whole becomes unreproducible, so it is not a big problem. there were.

The present invention has been made in view of such circumstances,
It is an object of the present invention to provide an electric motor that can be easily manufactured even if a thin winding is applied, defects can be reduced, and assembly by a machine can be easily performed.

Hereinafter, the present invention will be described based on an embodiment shown in the drawings. FIG. 1 is a vertical cross-sectional view of an electric motor according to an embodiment of the present invention, and FIG. And FIG. 3 is a plan view of an embodiment of the printed circuit board.

In FIG. 1, the electric motor is a doughnut-shaped stator core 1
A toroidal winding around which the winding 3 is wound via the insulator 2 is formed.

A large number of winding ends 4 are drawn out from the winding 3,
It is connected to a printed circuit board 5 arranged on one side of the stator core 1.

Furthermore, the stator core 1 and the printed circuit board 5 are entirely molded with resin 6.

In addition, the printed circuit board 5 is provided with a terminal 7 to which a printed wiring is connected. The terminal 7 is configured to be exposed from the resin 6 so that it can be easily connected to an external power source. There is.

In FIG. 2, in the electric motor, a large number of winding ends 4 which are the ends of the winding 3 are drawn out, and the winding ends 4 are sandwiched by the notches 8 formed on the radial peripheral edge of the printed circuit board 5. The winding end 4 is configured so that the winding end 4 can be easily clamped by the notch 8 from the inner peripheral side or the outer peripheral side as shown by the dotted line in the drawing.

In FIG. 3, the printed circuit board 5 is provided with a printed wiring 9 on one plane, and is extended so as to extend to the periphery of a notch 8 formed at the peripheral edge inside and outside the radial direction of the printed circuit board 5.

The printed wiring 9 is gathered in a part of the printed board 5, and the terminal 7 is provided in this part.

In the electric motor having such a configuration, the stator core 1 is formed in a donut shape, and the winding 3 is toroidally formed through the insulator 2 to form a stator.

Then, the printed circuit board 5 is disposed on one side of the stator, and the second
As shown in the drawing, the winding end 4 is fitted in the notch 8 and is connected to the printed wiring 9 formed around it by a process such as soldering.

Further, the printed circuit board 5 is formed so as to be in close contact with the winding 3 as much as possible, and is formed so as to cover the whole with the resin 6.

When the winding 3 and the printed circuit board 5 are covered with the resin 6 as described above, the resin 5 is placed in a mold for injecting the resin 5.
Although the resin 6 is injected at a high pressure, the distance between the winding end 4 and the printed circuit board 5 can be shortened, and there is no processing that causes disconnection of the winding end 4. Even if it receives the flow pressure of, it will not easily break.

In addition, the winding 3 to the winding end 4 can be easily connected to the printed board 5, and the winding end 4 is provided between the winding 3 and the printed board 5.
Is provided, there is no problem that the winding end 4 comes into contact with another object during the processing step to cause disconnection or insulation failure, and the quality of the product can be improved.

Such a printed circuit board 5 can easily be provided with the terminals 7, and the terminals 7 can be easily attached and connected by appropriately selecting the positions of the cuts 8 and the printed wirings 9 to which the winding ends 4 are connected. You can

Furthermore, if the printed wiring board 9 is provided on only one side of the printed circuit board 5 and the other is formed of an insulating material, it becomes an insulating material for the winding wire 3, which is convenient.

As described above, according to the present invention, the printed circuit board is arranged on one side of the donut-shaped stator, the winding ends are connected to the printed circuit board, and the notch is formed on the radial edge of the printed circuit board. If the winding ends are clamped, connection can be made easier, assembly by machinery and material costs can be saved, and especially simplification can eliminate defects such as wire breakage and improve reliability, and the terminal Since it is attached and connected to a power source etc., defects such as disconnection are less likely to occur, and a highly reliable electric motor can be obtained, and the effect is extremely large industrially. .

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view of an electric motor according to an embodiment of the present invention, FIG. 2 is a view of a main part showing an assembling method, and FIG. 3 is a plan view of an embodiment of a printed circuit board. It is a figure. 1 ... Stator core, 3 ... Winding, 4 ... Winding end, 5 ... Printed circuit board, 8 ... Notch, 9 ... Printed wiring.

Claims (1)

[Claims] 1. A doughnut-shaped stator core is provided with a winding wire and a printed board is provided on an end face in the axial direction. One surface of the printed board is provided with a printed wiring and the printed wiring is provided outside. A radial notch is formed on the peripheral edge of the printed board and the printed wiring is formed so as to reach the inner edge of the notch, and the winding end is drawn into the notch, and the winding end and the printed wiring are connected by soldering. An electric motor is characterized in that the stator core and the printed circuit board are integrally resin-molded.