JPH0546781B2 - - Google Patents

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a commutator-type rotating electric machine, and particularly to a commutator-type rotating electric machine in which a connection device between carbon brushes and field coils is improved. .

[Conventional technology]

An example of a technology that converts the connection parts between the field coil of a commutator-type rotating electric machine, carbon brushes, and external power lines into terminals and enables automatic assembly by a machine is disclosed in Japanese Patent Publication No. 58-42702. It has been known.

[Problem to be solved by the invention]

By the way, in commutator type rotating electric machines, the second
As shown in the figure, the relative angle θ of the field core 7 with respect to the brush holder 4 (in other words, the brush) is often varied by about ±10 degrees to optimize the rectification conditions.

The conventional examples described above do not consider a connection method that can be applied with the same configuration even when this relative angle is changed.

In other words, when the relative angle of the field core is changed in a rotating machine with different specifications, the relative position of the terminal connected to the end of the field coil and the brush holder side terminal connected to the carbon brush changes. This will result in no contact.

Therefore, it is necessary to change the shape and arrangement of the insulating stand that supports the field side terminal for each relative angle specification, or to change the shape of the brush holder, and it is necessary to prepare a variety of components.

Furthermore, when automatic assembly by a machine is considered, the parts set in each part supply device must be replaced every time specifications are changed, making the setup process complicated.

Furthermore, if each specification change is handled by providing a dedicated assembly device for the parts, the equipment cost will increase.

The present invention has been made in view of the above points, and an object of the present invention is to enable adaptation using the same component even when the relative angle of the field core to the brush is changed as in commutator type rotating electric machines with various specifications. It is an object of the present invention to provide a commutator type rotating electric machine which realizes a connection method, is suitable for automatic mechanical assembly, and exhibits an efficient cooling structure.

[Means to solve the problem]

The features of the present invention will be explained with reference to the reference numerals in the drawings used in the embodiments.

That is, in a commutator-type rotating electric machine in which the external power line, the stator-side field coil 9, and the rotor coil are electrically connected by the pair of brushes 28 coming into contact with the commutator 33 of the rotor 30, A pair of field coils 9 are wound around a stator core 7 having a magnetic pole piece 8, and two pairs of conductive terminals 11a, 12a, 11 are arranged on one end surface of the stator core 7.
a stator assembly 5 comprising an insulated terminal block 6 having the brushes 28 and 12b; a pair of brush holders 4 having the brushes 28 attached to the housing 2; A relay terminal plate assembly 14 is provided with two pairs of relay conductive terminals 16a, 17a, 16b, and 17b, and the insulated relay terminal plate 15 in the relay terminal plate assembly 14 has an annular shape, and the relay conductive terminal 1
6a, 17a, 16b, and 17b each have an arc-shaped contact surface concentric with the rotor shaft, and the arc-shaped contact surface faces the brush 28 side, and each of these relay conductive terminals is connected to the stator assembly. 5 conductive terminals 11a, 12a, 11b, 12b via a conductive insertion member 20, and this relay terminal plate assembly 14 is connected to the brush 28.
and the stator assembly 5, the conductive terminal 11a is fixedly disposed in the housing 2 together with the stator assembly 5 at an arbitrary set relative position with respect to the brush 28. ,12
a, 11b, 12b are coil connection parts 13, respectively.
are connected to each end of the field coil 9, and each brush holder 4 with a brush has a pair of conductive contact pieces 23a, 24a, 23, respectively.
b, 24b, and are attached so that they can be inserted through the wall of the housing 2 together with the conductive contact pieces from outside the housing toward the inside, and each pair of conductive contact pieces 23a, 24a, 23
One conductive contact piece 24a, 24 among b, 24b
b are each connected to the power supply side lead wire 43, and the other conductive contact pieces 23a, 23b are respectively connected to the brush 28, and these conductive contact pieces 23a, 24a, 23b, 24b are connected to the relay conductive terminal. 16a, 17a, 16b, and 17b are removably connected by elastic contact with the arcuate contact surfaces, and cooling air is introduced into the housing 2, and this cooling air connects to the annular insulated relay terminal plate. 1
The ventilation structure is such that the ventilation flows intensively toward the commutator 33 through the central hole 38 of No. 5.

[Effect]

With the above configuration, as shown in FIG.
7a - Conductive terminal 12a - Field coil 9 - Conductive terminal 11b - Relay conductive terminal 16b - Conductive contact piece 2
3b-Brush 28-Rotor coil-Brush 28
- Conductive contact piece 23a - Relay conductive terminal 16a - Conductive terminal 11a - Field coil 9 - Conductive terminal 12b
- A motor circuit is formed in which the relay conductive terminal 17b, the conductive contact piece 24b, and the power supply side lead wire 43 are electrically connected.

The stator assembly 5 and the relay terminal plate assembly 14 are assembled together with the conductive terminals 11a,
12a, 11b, 12b have relay conductive terminals 16a,
17a, 16b, 17b are inserted and connected, and these assemblies may be press-fitted and fixed in the housing 2 all at once.On the other hand, the brush holder 4 with the brush 28 and the conductive contact pieces 23a, 24
a, 23b, and 24b can also be inserted into the housing 2 all at once, and the assembly and connection of these parts only need to be linearly combined with each other, and automation using a machine is therefore possible.

In addition, relay conductive terminals 16a, 17a, 16b,
17b, the conductive contact piece 2 on the brush holder side
3a, 24a, 23b, and 24b are arcuate, even if the relative angle (relative position) of the stator assembly 5 and relay terminal plate assembly 14 to the brush 28 is changed depending on the model. , maintaining electrical contact between the conductive contact pieces 23a, 24a, 23b, 24b and the relay conductive terminals 16a, 17a, 16b, 17b.

Further, the insulated relay terminal plate 15 has an annular shape, and the rotor 30 is passed through the center hole 38 of the insulated relay terminal plate 15 to form a commutator 33.
These holes 38 can serve as a guide for cooling air flowing inside the housing 2 to flow intensively toward the commutator 33, thereby achieving concentrated cooling of the commutator. This can improve motor performance.

〔Example〕

An embodiment of the present invention will be described with reference to the drawings. 1st
The figure is a longitudinal cross-sectional view of an electric blower to which a commutator-type rotating electric machine according to the present embodiment is applied, FIG. 2 is an explanatory diagram of the relative angle between the field core and the brush holder, and FIG. 3 is a perspective view of the stator assembly. , Fig. 4 is a perspective view of the relay terminal plate assembly, Fig. 5 is a perspective view of each brush holder, and Fig. 6 is a perspective view of the relay terminal plate assembly.
The figure is a perspective view showing a combination of the field assembly and relay terminal plate assembly, Figure 7 is a perspective view of the brush holder attached to the housing, and Figure 8 is an overall circuit diagram of the motor. .

FIG. 1 illustrates an electric blower used in a vacuum cleaner or the like.

The electric motor section 1 is composed of a housing 2 and an end bracket 3, and a brush holder 4 is fixed to the housing 2 with screws or the like.

Reference numeral 5 designates a stator assembly that is press-fitted into the housing 2, and as shown in FIG. The field coil 9 is wound, and the end of each field coil 9 is connected to an insulated terminal block 6.
The conductive terminals 11a, 12a, 11b, and 12b are connected to the coil end connection portions 13 of the conductive terminals 11a, 12a, 11b, and 12b, which are press-fitted and supported by two pairs of terminal support stands 10 provided at the terminal support bases 10, respectively.

14 in FIG. 1 is a relay terminal plate assembly,
As shown in FIG. 4, two pairs of relay conductive terminals 16a, 17a and 16b, 17 are provided on a ring-shaped insulated relay terminal plate 15.
b is fixed. The relay terminal plate assembly 14 is arranged to be interposed between the brush 28 and the stator assembly 5. Relay conductive terminals 16a, 17a and 16
b, 17b each have an arcuate contact surface concentric with the rotor shaft, and this arcuate contact surface is the brush 28.
These relay conductive terminals 16a, 17a and 16b, 17b facing side are removably connected to the conductive terminals 11a, 12a and 11b, 12b of the stator assembly 5 via conductive pins 20 serving as insertion members. It has been done.

The relay terminal plate assembly 14 and the stator assembly 5 are
It is fixedly arranged in the housing 2 so that it can be in any set relative position with respect to the brush 28.

In this embodiment, the relay conductive terminals 16a, 17a, 16 are inserted into the square holes 18 provided in the insulated relay terminal board 15.
An example is shown in which the claw portions 19 of b and 17b are inserted and bent.

Relay conductive terminals 16a, 17a and 16b, 17
The position b is the conductive terminal 11a, 12a and 11
The pin 20 is located at a position facing the relay conductive terminals 16a, 17a, 12b, and 12b, and is crimped and fixed so that the pin 20 penetrates the insulating relay terminal plate 15 and is electrically connected to the relay conductive terminals 16a, 17a, 16b, and 17b.

The pair of brush holders 4 are as shown in FIG.
It consists of a conductive cylindrical part 21 and an insulating part 22 that supports it, and on both sides of the insulating part 22 there are a pair of elastic conductive contact pieces 23a, 24a and 23b, respectively.
24b is the cutout hole 2 provided in each of these conductive contact pieces.
5 is press-fitted and fixed to a boss 26 provided on the brush holder 4.

As shown in FIG. 1, a carbon brush 28, which is biased by a spring 27, is slidably inserted into the conductive cylindrical portion 21. , as shown in FIG. 1 or FIG. 5, the conductive contact piece 23a,
23b.

In FIG. 1, a rotor 30 is rotatably supported at both ends by bearings 31 and 32. 3
A commutator 3 is in sliding contact with the carbon brush 28 to perform a rectifying action.

At the side end of the end bracket 3 of the rotor 30,
A centrifugal fan 34 is attached, and a guide flow path constituted by a fixed guide vane 35 fixed to the end bracket 3 and a fan casing 36 is connected to the first
As shown by the arrow in the figure, airflow is generated by the fan 34 and flows into the motor section 1.

The rotor 30 and stator assembly 5 are cooled by this airflow, and the airflow is exhausted from the window 37 of the housing 2. At this time, it is deflected so that the flow is concentrated in the part of the commutator 33 which is the highest temperature part, and the part of the commutator 33 can be actively cooled.

In the above configuration, the assembly procedure will be explained next.

As shown in FIGS. 3 and 4, the stator assembly 5 and the relay terminal plate assembly 1 are assembled as partial assemblies.
By combining 4 in opposite directions as shown in Figure 6,
The conductive terminals 11a, 12a, 11b, 12b
The conductive pins 20 on the side of the relay conductive terminals 16a, 17a, 16b, 17b are inserted between the connecting portions 39 of the terminals 39, and are electrically and mechanically connected.

In this state, the stator assembly 5 and the relay terminal plate assembly 14 are press-fitted into the housing 2 and fixed at their regular positions as shown in FIG.

Thereafter, as shown in FIG. 7, insert the brush holder 4 into the brush holder 4 mounting hole provided on the side surface of the housing 2 in the direction of the arrow, that is, from the outside of the housing toward the inside, and screw the
0 to fix it to the housing 2. Reference numerals 41 and 42 are holes formed in the housing 2 for inserting the conductive contact pieces 23a, 24a, 23b, and 24b, and when inserting the brush holder, the conductive contact pieces 23a, 24a, and 23b,
24b is inserted.

The relay conductive terminals 16a, 17a, 16b, 17b and the conductive contact pieces 23a, 24a, 23b, 24b, which are located opposite to each other inside the housing 2, can each obtain an electrical connection while being elastically bent. can.

After doing this, each conductive contact piece 24a, 2
4b and the power supply side lead wire 43, the electric circuit of the motor can be completed as shown in FIG.

As can be seen from FIG. 7, the relay conductive terminal 16
The contact portions of the conductive contact pieces 23a, 24a, 23b,
Reliable contact between 24b and 24b can be obtained.

As described above, according to the present embodiment: 1. Assembly and connection of each part can be completed by simply combining them linearly with each other, and can be automated by a machine.

2. Changing the relative angles of the stator assembly 5 and the relay terminal plate assembly 14 with respect to the carbon brush 28;
Alternatively, the same component configuration can be applied to mixed assembly of products with different relative angle specifications, and in particular, in automatic assembly equipment, assembly can be performed using the same equipment without changing the assembly operation.

3 The insulated relay terminal plate 15 is formed into an annular shape having a guide hole 38 through which the rotor 30 passes, thereby deflecting the cooling airflow flowing through the motor housing 2 and concentrating it on the part of the commutator where the temperature is highest. Since it is cooled, the performance of the electric motor can be improved.

Note that although the above embodiment relates to an electric blower used in a vacuum cleaner, the present invention is not limited thereto, and can be widely applied to electric blowers having a general cooling fan. Furthermore, the load is not limited to blowing air, but is a general-purpose rotating electric machine for driving general equipment.

〔Effect of the invention〕

As described above, according to the present invention, even when the relative angle of the field core to the brush is changed as in commutator-type rotating electric machines with various specifications, a connection method that can be adapted using the same component is realized. In addition, it is possible to provide a commutator type rotating electrical machine that enables automatic mechanical assembly of different models using the same assembly device and that exhibits an efficient cooling structure.

[Brief explanation of the drawing]

Fig. 1 is a longitudinal cross-sectional view of an electric blower to which commutator-type rotating electricity is applied according to the present embodiment, Fig. 2 is an explanatory diagram of the relative angle between the field core and the brush holder, and Fig. 3 is a diagram of the stator assembly. FIG. 4 is a perspective view of the relay terminal plate assembly, FIG. 5 is a perspective view of each brush holder, and FIG. 6 is a perspective view showing a state in which the field assembly and relay terminal plate assembly are combined. , FIG. 7 is a perspective view of the brush holder shown attached to the housing;
FIG. 8 is an overall circuit diagram of the electric motor. DESCRIPTION OF SYMBOLS 1... Electric motor part, 2... Housing, 4... Brush holder, 5... Stator assembly, 6... Insulated terminal block, 7... Field core, 8... Magnetic pole piece, 9...
Field coil, 10...Terminal support stand, 11a, 12
a, 11b, 12b... Conductive terminal, 13... Coil end connection portion, 14... Relay terminal plate assembly, 15
...Insulated relay terminal board, 16a, 17a, 16b,
17b...Relay conductive terminal, 23a, 24a, 23
b, 24b... Conductive contact piece, 28... Carbon brush, 39... Connection portion, 43... Power supply side lead wire.

Claims (1)

[Claims] 1. The pair of brushes 28 are connected to the commutator 33 of the rotor 30.
In a commutator-type rotating electric machine in which the external power supply line, the stator-side field coil 9, and the rotor coil are electrically connected, a pair of fields are applied to the stator core 7 having a pair of magnetic pole pieces 8. A magnetic coil 9 is wound around the stator core 7, and two pairs of conductive terminals 11a, 12a, 11 are provided on one end surface of the stator core 7.
a stator assembly 5 comprising an insulated terminal block 6 having the brushes 28 and 12b; a pair of brush holders 4 having the brushes 28 attached to the housing 2; A relay terminal plate assembly 14 is provided with two pairs of relay conductive terminals 16a, 17a, 16b, and 17b, and the insulated relay terminal plate 15 in the relay terminal plate assembly 14 has an annular shape, and the relay conductive terminal 1
6a, 17a, 16b, and 17b each have an arc-shaped contact surface concentric with the rotor shaft, and the arc-shaped contact surface faces the brush 28 side, and each of these relay conductive terminals is connected to the stator assembly. 5 conductive terminals 11a, 12a, 11b, 12b via a conductive insertion member 20, and this relay terminal plate assembly 14 is connected to the brush 28.
and the stator assembly 5, the conductive terminal 11a is fixedly disposed in the housing 2 together with the stator assembly 5 at an arbitrary set relative position with respect to the brush 28. ,12
a, 11b, 12b are coil connection parts 13, respectively.
are connected to each end of the field coil 9, and each brush holder 4 with a brush has a pair of conductive contact pieces 23a, 24a, 23, respectively.
b, 24b, and are attached so as to be inserted through the wall of the housing 2 together with the conductive contact pieces from the outside of the housing toward the inside, and each pair of conductive contact pieces 23a, 24a, 23
One conductive contact piece 24a, 24 among b, 24b
b are respectively connected to the power supply side lead wire 43, and the other conductive contact pieces 23a, 23b are respectively connected to the brush 28, and these conductive contact pieces 23a, 24a, 23b, 24b are connected to the relay conductive terminals. 16a, 17a, 16b, and 17b are removably connected by elastic contact with the arcuate contact surfaces, and cooling air is introduced into the housing 2, and this cooling air connects to the annular insulated relay terminal plate. 1
A commutator-type rotating electric machine characterized by having a ventilation structure in which ventilation flows intensively toward the commutator 33 side through the central hole 38 of No. 5.