JPS6141406Y2 - - Google Patents

Description

[Detailed explanation of the idea] The present invention relates to an electric motor equipped with a commutator.

In conventional commutator motors, the brush holder that supports the carbon brushes is a separate part from the motor frame and is attached to the motor frame, so the brush holder and its mounting plate are required, reducing the number of parts. In addition, there was a problem that assembly was time consuming.

Furthermore, since carbon brushes are used in commutator motors, abrasion powder from the brushes can adhere to the field coil, the end face of the field core, the brush holder mounting plate, etc., reducing insulation resistance and causing breakdown voltage problems. This sometimes caused problems such as

Therefore, the purpose of the present invention is to provide a commutator motor that can prevent a decrease in insulation resistance and the occurrence of breakdown voltage defects, reduce the number of parts, reduce weight, and shorten the overall length. do.

That is, in the commutator motor of the present invention, a resin is integrally and entirely coated on the end face of the field core on the commutator side, and a protrusion from the core end face on the commutator side of the field coil is coated in the resin. The entire part is integrally embedded, and a brush holder hole is integrally formed in the resin close to the embedded protrusion, and a bearing support that pivotally supports one end of the rotating shaft to which the commutator is attached is provided. The feature is that the parts are integrally formed.

Embodiments of the present invention will be described below with reference to the drawings. In FIG. 1, reference numeral 1 denotes an armature core, through which a rotating shaft 2 passes, and a commutator 3 is attached to this shaft 2 at one end of the armature core 1. Both ends of the rotating shaft 2 are supported by bearings 4a and 4b, and the shaft 2 is configured to rotate at the center of a field core 5 provided surrounding the outer periphery of the armature core 1.

A field coil 6 is attached to the core 5 with both ends protruding from both end surfaces of the field core 5. Further, the end face portion of the field core 5 on the commutator side is coated with a resin 7.

This resin 7 integrally and completely covers the end face of the field core 5 on the commutator 3 side, and also integrally embeds the entire protruding portion of the field coil 6 protruding from the end face of the core 5 inside. There is. Reference numeral 8 denotes a brush holder portion, which is integrally molded from the resin 7, and a brush holder 9 for supporting a brush is integrally formed in this portion. This holder hole 9 is provided close to the protrusion of the coil 6 on the commutator 3 side. Further, reference numeral 10 denotes a bearing support section, which houses one of the bearings 4a and rotatably supports the rotating shaft 2. This bearing support portion 10 is also integrally molded from the resin 7, and is formed further away from the field core 5 than the brush holder portion 8.

Reference numeral 11 denotes a blower fan provided on the opposite side of the commutator 3 with the armature core 1 as a boundary, and is attached so as to rotate together with the rotating shaft 2. Then, the blower fan 1 of the field coil 6
The first side protrudes from the end face of the core 5, and this protrusion is exposed. 12 is the ventilation fan 1
1, and is formed of, for example, a fixed case member 13 connected to the field core 5, and a fixed case member 14 whose peripheral part is placed over the peripheral part of the fixed case member 13. ing. The case member 14 has a suction port 14a in its center, and the case member 13 has a blowout port 13a. The air outlet 13a faces the end surface of the field core 5 on the side of the blower fan 11 and the protruding portion of the field coil 6 protruding from this end surface. Furthermore, the central part of the fixed case member 13 supports the bearing 4b, and fixed blades 12a are provided inside the fan case 12 to guide the wind generated from the blower fan 11 to the outlet 13a. Air outlet 13
The wind blown from a is blown onto the fan 11 side protrusion of the field coil 6 to cool this protrusion.

Reference numeral 15 denotes a carbon brush inserted into the brush holder hole 9, which is pressed by a spring 15a and is in pressure contact with the commutator 3. A terminal plate 16 is attached to the brush holder portion 8 with a part of it protruding outward, as shown in Fig. 2 or 3. This terminal plate 16 is connected to the field coil 6 via a lead wire 17. Fig. 3 shows the connection between the terminal plate 16 and the field coil 6 connected with a crimping metal fitting 18, and this connection is covered with resin 7.

When the commutator motor with the blower fan 11 described above is operated, the blower fan 11 causes the first
Since the air flow shown by the arrow in the figure is formed,
The protruding portion of the field coil 6 exposed to the fan 11 side, which is strongly hit by this wind, is cooled by the air flow, so that its heat dissipation effect is large. Furthermore, since the resin 7, which has better thermal conductivity than air, is in close contact with the commutator 3 side, which is hardly hit by the cooling air, heat can be radiated from the entire resin 7. Therefore, the temperature rise of the field coil 6 can be suppressed to a low level.

The commutator motor having the above configuration has the following effects.

The end face of the field core on the commutator side is entirely covered with resin, and the entire protruding part of the field coil that protrudes from the end face of the core is embedded in the resin, which prevents brush abrasion powder. The core end face portion and the coil protrusion portion can be completely isolated. Therefore, brush abrasion powder does not adhere to the end face portion and the coil protrusion, and therefore, it is possible to prevent a decrease in insulation between the two and to prevent a breakdown voltage failure.

Since the brush holder hole is integrally formed in the resin and the brush holder is supported there, there is no problem of poor insulation between the resin brush holder part and the end face of the field coil and field core. There isn't. Therefore, the brush holder hole can be provided close to the protrusion of the field coil embedded in the resin. In this way, the distance between the brush holder hole and the field coil can be reduced. This allows the commutator to be placed closer to the armature core, reducing the axial dimension of the motor.
Miniaturization can be achieved.

Furthermore, the brush holder hole and the bearing support portion are integrally formed in the resin, and the brush holder hole and the bearing support portion are integrally supported by the field coil and the core end face, so that the resin can constitute a part of the motor frame. Therefore, the structure of the motor frame becomes simple, and the weight can be reduced by using resin.

Furthermore, as mentioned above, the end face of the field core on the commutator side and the protruding part of the field coil protruding from this end face are integrally covered with resin to be molded, and the brush holder hole and the bearing are covered in this resin. Since the support parts are each integrally molded, the number of parts can be reduced compared to a configuration in which the brush holder and the bearing support part are separate parts, and the number of assembly steps can be significantly reduced.

[Brief explanation of drawings]

FIG. 1 is a vertical side view of a part of a commutator motor with a blower fan according to an embodiment of the present invention, FIG. 2 is a vertical side view of a part of a brush holder, and FIG. FIG. 7 is a vertical side view showing deformation. 2... Rotating shaft, 3... Commutator, 4a, 4b...
Bearing, 5... Field core, 6... Field coil, 7... Resin, 9... Brush holder hole, 1
0...Bearing support part.

Claims (1)

[Scope of utility model registration request] A resin is integrally and entirely coated on the end face of the field core on the commutator side, and the entire protrusion of the field coil from the end face of the core on the commutator side is integrally embedded in the resin, and the resin The brush holder hole is integrally formed close to the embedded protrusion, and a bearing support portion for pivotally supporting one end of the rotating shaft to which the commutator is attached is integrally formed. commutator motor.