JPS59213261A - Small-sized motor - Google Patents

Abstract

PURPOSE:To improve the sliding property of a commutator slide with a commutator segment and to prevent the life of a motor from shortening by filling solid paraffin in a gap between adjacent commutator segments. CONSTITUTION:Solid paraffin 14 is filled in a gap between adjacent commutator segments 4. The paraffin has insulating property, is ground at a commutator slide, and an ultrafine amount of paraffin is adhered onto the segment. Since the paraffin can become a lubricant on the sliding surface even if the paraffin becomes carbide by an arc produced between the slide and the segment, it can reduce the frictional coefficient of the slide and prevent the slide from fusion- bonding.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industry-1-1) The present research relates to a small motor used for feeding tape in, for example, a tail recorder, a video tape recorder, etc.

(Problems with the conventional 11/M configuration) In part, the brushes in the /1 type motor have low elasticity.
v'+ '+-u kA material, for example, copper Be IJ I
It is formed by cutting a thin plate of Jium alloy, and in particular,
In a small motor with a note (O) attached in the longitudinal direction of the commutator sliding part that forms part of the brush, the commutator sliding part vibrates when the commutator rotates, and as a result, Abnormal welding may occur on the contact surfaces of the commutator slides to the commutator segments.

In some brushes for small motors, a commutator sliding portion that slides on a commutator segment is molded integrally with a brush base that is supported by support means provided on, for example, a lid of a motor case. FIG. 1 shows the state of contact between this type of brush and the commuator segment.

In FIG. 1, the brush base 2 supported by the brush support means 1 also has a folded back 1. Theta sliding>51
+3 is growing. This commutator sliding portion 3 has elasticity because it is bent from the brush base 2, and is in contact with the commutator segment 4 in a pressed state. This pressing force can be set to a safe value by appropriately selecting the bending angle between the brush base 2 and the commutator sliding part 3. The commutator segment 4 is fixed to the motor rotating shaft 6 via the insulating tube 5, and rotates with the rotation of the motor. In this way, the rotating commutator segment 4 and the commutator sliding part 3 are in sliding contact. Therefore, electric sparks are likely to be generated between the two, and the generation of electric sparks causes inconvenient conditions such as electric noise and welding on the commutator sliding portion 3. And, the occurrence of welding with the brush not only shortens the life of the brush, but also
If welding occurs at the position where it begins to make contact with each commutator segment 4 and at the position where it leaves (section a in Figure 1), the welding with the commutator segments 40 will scratch and damage the surface of the commutator segment 40. Debris accumulates in the gap between adjacent commutator segments 4, which causes the inconvenience that the commutator segments are electrically connected to each other, and the performance of the motor itself deteriorates. there were. Note that: 1) Electric sparks are often generated at section a of the sliding section in IJ.

The biggest cause of this is vibration of the plan. That is, electric sparks are frequently generated due to the vibration of the brush, and this Jl promotes the occurrence of welding, leading to roughness of the sliding surface. As the roughness increases, the number of electric sparks increases, and eventually it becomes impossible to obtain the required characteristics of the motor, leading to the motor stopping.

In general, the material of the commutator sliding part 3 is phosphorus[1''' copper, and the material of the commutator segment 4 is silver copper, silver cadmium, copper, gold, etc., and this is because the two materials are almost the same. However, the sliding resistance is as high as 10, which is an unfavorable combination that tends to cause scratches at the sliding interface.

As a means for suppressing the electric sparks that cause these defects and as a means for reducing sliding resistance, there is a method of applying Niclease 13 to the surface of the commutator segment 4.

However, with this method of applying grease 13, if the viscosity of the grease was too high, the contact pressure on the sliding part of the commutator would be insufficient, resulting in poor continuity, and if the viscosity at room temperature was optimal, the viscosity at low temperature would be poor. Grease sometimes rises and causes poor contact pressure, and when used at high temperatures, the viscosity of the grease decreases and it scatters due to the rotational force of the commutator segment.

The ambient temperature for this device is -10°C to +60°C.
Many are used within the temperature range of ℃.

If grease is applied too much and noise is generated, if no vibration damping measures are taken for the commutator sliding part 3, as shown in Fig. 2(a), the vibration of the commutator sliding part 3 will be reduced. Therefore, welding easily occurs even when used at room temperature, making it difficult to obtain a product with a long life and excellent quality. In addition, as shown in FIG. 2(b), the commutator sliding part 3
A product with anti-vibration rubber 9 pasted with adhesive 8 has good vibration absorption at room temperature and can suppress the generation of sparks, but when the temperature reaches the upper limit of 60°C, the adhesive becomes extremely viscous. As a result, the adhesion of the anti-vibration rubber 9 to the sliding parts decreases, and the vibration absorption ability decreases, making it difficult to generate sparks, resulting in a product with a short life and unstable quality. . Further, as shown in FIG. 2(C), a vibration prevention sheet 12 is applied to the commutator sliding part 3 and an adhesive 8 is applied to both sides of the base material 10. When pasted with the adhesive lγ1 material 11, the viscosity of the adhesive decreases at high temperatures when compared to the example shown in Figure 2 (1) above. Longevity Hatake, you can't get high quality.

(Objective of the Invention) The present invention aims to improve the commutator sliding part and the sliding part of the commutator segment, and to stop the shortening of the motor life by one notch due to hot water loss due to friction on the surface of the commutator segment.
Still, the present invention provides a high-performance compact sweater that can reduce wow when incorporated into a Teso recorder or the like.

(Structure of the Invention) In order to achieve the above object, a sliding part is supported by the brush support means and extends from the base of the ζ brush, and by bending this sliding part, contact force to the commutator segment is applied. In a small motor with brushes structured to obtain
Fill the gap between adjacent commutator segments with solid/grain filling.

The melting point of this solid/grain should be determined within the practical operating range of the small motor. -The solid/grain has insulating properties, and is scraped off by the commutator sliding part. A small amount of mother rough-in arrives. Wow, this...Even if the graphin mixes with carbide due to the arc generated between the dust-arc sliding part and the commutator segment, it can act as a lubricant on the sliding surface, so the friction coefficient of the moving part is 1.11. This reduces the number of sets 1.0 and prevents wear on the sliding parts.

(Description of Embodiment) FIG. 3 shows an embodiment of the present invention, and the same symbols as those in FIG. 1 indicate the same things.
4 is solid/grain filled in the gear and gap between the adjacent joints, arc segments 1-4.

By the way, in the literature and experiments at this size, the state where the commutator sliding part and the commutator segment are easy to melt and slide,
Alternatively, conditions in which welding, abnormal wear, and non-conductivity are less likely to occur are being clarified.

5'11 The most common conditions that occur are the sliding parts and segnon [・
The atmosphere of the part where it slides, 1/ko1r [beard 7) 71
・11 bodies (/contains unsaturated cyclic hydrocarbons, , /j
It is a mixture of ``su, suction 1: i shi;', -riru''. At this time, there is a phenomenon called shin, powder, which promotes an abnormal phenomenon.

This purchase shows that when an unsaturated cyclic hydrocarbon is combusted by an arc between the sliding part and one hygnont, one medium body λ)1
This may be due to the fact that there are a lot of carbon groups in the carbon fiber, which may be incomplete or due to its molecular structure. It seems impossible to do so.

The vesicle o['', the atmosphere of hydrocarbons outside the cyclic hydrocarbon,''9 and adsorption to the segment l) 1, the nosic powder is no 1. Brown Q Ugut (
1-f'Q'' and generates foreign matter that may cause abnormal phenomena.

Brown powder has less carbon content per unit volume than vesicular hydrocarbons, and is non-redundant.
It is unlikely to occur with I. Furthermore, although this is due to the +:fi structure of the molecule, it has been clarified that the carbon produced is also soft and does not lead to abnormal phenomena.

Based on these phenomena, a long-term operation test (
I took a risk. In this experiment, the probability of abnormal wear occurring in the commutator segment is high in 1) high seats 1 and low humidity.

2) In the commutator segment], about 0/19 carbon (if there is adsorption of arsenic, the abnormal phenomenon of the commutator segment is alleviated, and the length of the small motor) -f life is attempted.

The result was obtained.

In the above-mentioned pulling house, the commutator segnon [between the commutator segment and the joint part of the sliding part and the segment II part is about lil f on the gear and joint part between the commie-arc segments that are adjacent to each other.
In consideration of the possibility of entanglement, in the present invention, as shown in the embodiment of FIG. 3, the gap between adjacent commie-arc segments is filled with isomorphic ξ-gynoine 14.

Solid Q rough-in is most different from unsaturated cyclic hydrocarbons in terms of its height, so black powder is the least likely to be produced, and the
+: ・I1-S generates brown towder that does not cause the 1 phenomenon.
This solid paraffin has a melting point of 0 to 73 degrees Celsius. The temperature of the atmosphere used in the equipment is 1', 1: 1 (1-60'C), 1 blood, 1 tights, 0.

The solid graphite 14 is scraped off to a degree of <63° by the commi-arc sliding motion, and the particles adhere to the surface of the commi-arter segment 4, acting as a lubricant. Sliding 771 (active metal fungi formed by abrasion of) [
, it has the property of adsorbing everything, so ('It,
It can easily adsorb and hold 9 run-ins. Even if this paraffin is carbonized by the arc of the sliding part, the generated 11ψ Since it plays the role of a lubricant (1), it can prevent abnormal wear and seizure of sliding parts.

Even if the motor housing is constructed of styrene plastic, which is easily affected by oil, grease, bath additives, etc., it will not be affected by solid paraffin.

(Effects of the Invention) As explained above, according to the present invention, the lubricant action of solid paraffin can prevent abrasion damage on the surface of the jacomitator segment caused by uneven wear on the sliding part.
Also, the generation of electrical noise is reduced, resulting in improved quality and significantly longer service life of small motors.

[Brief explanation of the drawing]

FIG. 1 is a configuration diagram of a conventional example, and FIGS. 2(a) to (C) are
A diagram showing the configuration of a conventional commutator sliding part, respectively.
FIG. 3 is a configuration diagram of an embodiment of the present invention. 2 - Brush base, 3 - Commutator sliding part, 4 Commutator segment l-, 14 Solid paraffin 0 Patent applicant: Matsushita Electric Industrial Co., Ltd., Agent: Hisashi Hoshino 1. : Tomu □-ri Figure 1 Figure 3

Claims (1)

[Claims] ti9-Commutator sliding consisting of a plate-shaped metal bullet body)
1. A small motor equipped with brushes having an angle of 117, characterized in that a gap between adjacent commutator segments is filled with solid graphite.