JPS5842702B2 - Electrical connection device between stator winding and carbon brushes in electric motor - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in a connection device between a carbon brush and a field coil in a commutator type rotating electric machine.

A conventional commutator motor used in vacuum cleaners and the like is shown in FIG.

This electric motor main body 1 is connected to an electric blower 2 and is connected to an electric blower 3.
is formed.

This electric motor main body 1 has a brush holder 4 fixed therein, and a carbon brush 5 is provided inside the brush holder 4 so as to be slidable while being biased by a spring 6.

The conductive contact piece 7 of this carbon brush 5 is fixed to the brush holder 4 by a claw portion (not shown).

Further, the rotor 8 of the electric motor body 1 includes a bearing 9 and a commutator 10.
, the rotor winding 11, the stator core 12, and the shaft 13 form the structure, and the stator 14 has the shape and structure formed by the iron core 15 and the stator winding 16.

Both ends of the field coil 16 are guided to the outside by lead wires 17 and 18 passing through a bush 19 provided in a hole in the motor body 1.

Further, a female connector 20 is provided at the tip of the lead wire 1T that connects to the conductive contact piece 7 of the carbon brush.
The female connector 20 is connected by fitting into the tab 21 of the conductive contact piece 7 of the carbon brush.

In this way, in a rectifying motor, the conventional field coil 16
Since the electrical tangent between the conductive contact piece 7 of the carbon brush and the conductive contact piece 7 of the carbon brush is provided by the lead wire 17 and the female tangent 20, it has the following disadvantages.

First, it is necessary to install the lead wires 17, which are difficult to position, inside and outside the motor body 1, making it extremely difficult to automatically assemble the motor by mechanization.

Therefore, conventional electric motor assembly has to be done manually, which is inconvenient in terms of work efficiency, labor costs, etc.

Second, since the lead wire 17 is exposed to the outside of the motor body 1, the lead wire 17 may be touched by hand or an external member when installing the motor into a vacuum cleaner or the like.
There is a risk that the connection between the female connector 20 and the conductive contact piece 7 of the carbon brush will come off due to external force acting on the connector 7, which significantly reduces the reliability of the electrical connection.

SUMMARY OF THE INVENTION The present invention addresses the above-mentioned drawbacks and aims to provide a commutator-type rotating electric machine that can be assembled and wired extremely easily.

Embodiments of the present invention will be described in detail below with reference to the drawings.

The insulated terminal support stand 31 is made of thermosetting resin or the like, and has support legs 32 .

Conductive relay terminals 35 and 36 having female connecting portions 33 and 34 are implanted into the insulated terminal support base 31.

A fitting groove 38 is formed in the stator core 37, and the insulated terminal support stand 31 is fixed to the stator core 37 by fitting the support foot portion 32 into the fitting groove 38.

Since this electric motor is provided with two field magnets, two insulated terminal support stands 31 are provided symmetrically.

The conductive relay terminals 35 and 36 have ends 42 and 43 of the field coils 41 wound around the stator core 37, respectively.
Coil end connection portions 39 and 40 are provided for connecting the coil ends.

The end of each field coil 41 is connected to the coil end connection portion 39, 40 by fixing means such as soldering or crimping.

That is, FIG. 2 shows the ends 42, 43 of each field coil 41.
The figure shows a state in which the coil end connections 39 and 40 are connected to the insulated terminal block 31 on the front side.

Although not shown in this figure, the other ends 42 and 33 of each field coil 41 are connected to coil end connections 39 and 40 provided on the insulated terminal block 31 on the opposite side.

The connection is made by connecting the insulated terminal block 31 on the opposite side to the stator core 3.
This will be done after incorporating into 7.

The brush holder 44 includes an insulating part 45 formed of thermosetting resin or the like, and a cylindrical part 46 formed of metal or the like.
It is composed of.

This brush holder 44 is fixed to an end bracket 47 with screws 48.

As shown in FIGS. 3 and 4, inside the insulating portion 45 of this brush holder 44, there is a conductive contact piece 51 consisting of a female connecting portion 49 and a female connecting portion 50, and a female connecting portion 51 at both ends. A conductive contact piece 54 formed by providing connecting portions 52 and 53 is provided in parallel.

Next, the assembly of the electric motor having the above-mentioned structure will be explained based on FIG. 5.

First, the field coil 41 is wound in the motor housing 55 as described above, connected to the insulated terminal support stand 31, and the assembled stator core 37 and rotor are assembled, and then the brush holder 44 is attached to the end. Lower the bracket 47 in the direction of the solid arrow, fit the housing 55 and the bearing 56 into the end bracket 47, and tighten the housing 5 with screws or the like.
5 and the end bracket 47 are fixed.

At this time, the conductive contact piece 51.5 on the brush holder 44 side
The female connecting portions 50, 53 provided in the stator core 4 are inserted into the female connecting portions 33, 34 provided in the conductive relay terminals 35, 36 of the 37 stator cores, and are automatically connected. Electrical and mechanical connections are made.

After that, attach the carbon brush 57 to the brush holder 44.
The female connecting piece 59 provided on the terminal 58 of the carbon brush 57 is inserted into the female connecting part 49 provided on the conductive contact piece 51 to electrically and mechanically connect it. .

Further, a female terminal 61 provided at the tip of the power supply side lead wire 60 is inserted into a female connecting portion 52 provided on the conductive contact piece 54 to establish an electrical and mechanical connection.

The circuit of the electric motor assembled as described above is as shown in FIG.

In this way, according to the above embodiment, the internal wiring of the motor can be done without using any lead wires.

FIG. 6 shows another embodiment of the present invention, in which the shapes of the conductive relay terminals 35 and 36 and the conductive contact pieces 51 and 54 are changed.

According to this configuration, the brush holder 44 is fixed to the housing by being inserted into the hole of the housing 55 in the direction of the arrow and screwed in the final assembly stage.

The conductive relay terminals 35, 36 and the conductive contact pieces 51, 54 are connected in the same manner as in the previous embodiment.

As described above, the present invention connects both ends of a field coil to the coil end connections of a conductive relay terminal, provides a pair of conductive contact pieces on the brush holder, and connects one conductive contact piece to the brush holder. In addition to electrically connecting the carbon brush provided on the holder, the conductive contact pieces on three sides are electrically connected to the power supply side lead wire, and when assembling the motor or assembling the brush holder, the double-groove conductive contact pieces are It is automatically connected to a pair of conductive relay terminals, and has great practicality as it allows for extremely easy assembly and arrangement of the motor.

[Brief explanation of the drawing]

Fig. 1 is a cross-sectional view of essential parts of an electric blower using a conventional connection device, Fig. 2 is a perspective view showing a stator according to an embodiment of the present invention, and Fig. 3 shows a part of a brush holder of the present invention. A sectional view showing,
FIG. 4 is an enlarged view of the main parts, FIG. 5 is a partial sectional view showing the assembly procedure of an electric motor using the device of the present invention, and FIG. 6 is a sectional view showing a part of the brush holder of another embodiment of the present invention. , FIG. 7 is an overall circuit diagram of the electric motor. 1... Motor main body, 31... Insulated terminal support stand, 35. 36... Conductive relay terminal, 37
...Stator core, 38...Stator core fitting groove, 39, 40...Coil end connection part, 4
1... Field coil, 44... Brush holder 51, 54... Conductive contact piece.

Claims (1)

[Claims] a stator core having a pair of magnetic pole pieces; a pair of field coils wound around the stator core; a pair of insulated terminal supports attached to the stator core; A device comprising a pair of conductive relay terminals and a pair of brush holders, each of which has a connecting portion and a coil end connecting portion, and both ends of the field coil are connected to the conductive relay terminals. The brush holder is provided with a pair of conductive contact pieces, one of which is electrically connected to the brush provided on the brush holder, and the other conductive contact piece is electrically connected to the brush holder. 1. A commutator-type rotating electric machine, which is electrically connected to a power supply side lead wire, and has a double-groove conductive contact piece removably connected to a connecting portion of the pair of conductive relay terminals.