JPH0755035B2 - Small motor manufacturing method - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is for achieving a long life of a small motor used for driving a tape of a tape recorder, a video tape recorder, or the like.

Conventional technology Explaining with an example of a small motor with the highest number of contacts,
Generally, there are two types of brushes in a small motor. One is an electrically conductive material having elasticity, for example, copper, beryllium copper, copper titanium alloy, phosphor bronze, nickel silver thin plate material or wire material, and noble metal alloy, for example, Au, Pd, Pt, Ag, Cu, etc. and their alloys. Is a clad, or a thin plate material, is a structure joined to a part of the wire rod by means of spot welding, the other is a sintered carbon brush, for example, carbon to a part of the thin plate material or wire rod described above, Ag carbon, Cu
SiC, Mo for carbon, AgCu carbon, and their materials
S _2, Pb, conductive adhesive those formulated as an additive such as an epoxy resin, spot welding, or are formed by means such as caulking method, in the small-sized motor having these brushes, commutator rotation Sometimes
The brush sliding part vibrates unnecessarily, which causes abnormal welding on the contact surface of the brush sliding part with respect to the commutator segment, and the black matter (carbon and the brush and the commutator segment) between sparks. This is a problem because foreign matter is often generated that promotes an abnormal phenomenon called a mixture of sliding wear particles that occurs. As an example of a brush for a small motor, there is one in which a brush sliding portion that makes contact with a commutator segment is integrally formed with a brush base portion that is supported by a supporting means provided on a lid of a motor case. The contact state between such a brush and the commutator segment is shown in FIG.

In FIG. 5, a folded brush sliding portion 3 extends from a brush base portion 2 supported by the brush supporting means 1. The brush base portion 2 and the brush cushion portion themselves have elasticity and are in contact with the commutator segment 4 in a pressed state. Then, this pressing force can be set to a required value by appropriately selecting the bending angle between the brush base portion 2 and the brush sliding portion 3. Also,
The commutator segment 4 is fixed to the motor rotating shaft 6 via the commutator base 5 and rotates with the rotation of the motor.

In this way, the commutator segment 4 that contacts
An electric spark is generated from the brush sliding part 3 at the time of rectification and due to an intermittent contact point. With the generation of the electric spark, electrical noise, wear and welding on the commutator segment 4 and the brush sliding part 3 are caused. An inconvenient state occurs such as occurrence of.

For example, when welding occurs at the position where the commutator segment 4 starts to contact and the position where the commutator segment 4 starts to separate (part a in FIG. 5),
The deposit scrapes and damages the surface of the commutator segment 4, and the chips generated by the scrape are accumulated in the gap (b part in FIG. 5) between the commutator segments 4 adjacent to each other. Therefore, the commutator and the segment are electrically connected to each other, and the rotation becomes unstable. Also, for example, if the surface roughness of the commutator segment surface becomes rough due to wear, it may cause vibration of the brush, promote the generation of electric sparks, further wear, and cause abnormal wear etc. , The performance of the motor itself is deteriorated, such as the shift of the commutation position.

An electric spark is best generated at the contact surface a between the brush sliding part 3 and the commutator segment 4. Needless to say, the commutator segment 4 and the brush sliding portion 3 that come into contact with each other also suffer mechanical wear that is not caused by electric sparks.

Generally, the material of the brush sliding part 3 which is often used is a noble metal alloy or sintered carbon as described above, and the material of the commutator segment 4 is a noble metal alloy such as Au, Pd, Ag or the like, such as AgCu, AgCd, AgCuCd, It is made of AgCuTi. Especially when combined with precious metal brushes,
Since the surface energy is high and both materials are almost the same, it is a disadvantageous combination in which scratches easily occur on the contact surface. In addition, even in the combination with a sintered carbon brush, although the sliding resistance is smaller than that of a noble metal alloy brush, impurities such as SiO ₂ are not a little mixed in the blended material forming the brush, There is a risk of scratches, and in the case of a noble metal alloy carbon brush, as in the case of a noble metal alloy brush, it is a disadvantageous combination in which scratches easily occur on the contact surface. The example of FIG. 6 (a) shows a structure that does not have a mechanical means for suppressing the electric sparks that are the cause of these drawbacks.
That is, in the case where no vibration damping measures are taken in the brush sliding part 3, the vibration of the brush sliding part is large, sparks are often generated, and welding and wear are likely to occur. A configuration in which vibration damping measures are taken for the brush sliding part 3 is shown. That is, the vibration-proof rubber 9 is attached to the brush sliding portion 3 with the adhesive 8, and the vibration absorption is good at room temperature and the generation of sparks can be suppressed.
However, in the vicinity of the maximum use temperature of 60 ° C, the viscosity of the pressure-sensitive adhesive decreases remarkably, the adhesive strength of the anti-vibration rubber 9 with the sliding portion 3 decreases, the vibration absorption capacity decreases, and sparks increase. , Long-lived quality ones are hard to come by.

Further, FIG. 6 (c) shows another example of a structure in which the brush sliding portion 3 is provided with vibration damping measures as in FIG. 6 (b). That is, the vibration-proof sheet 12 is attached to the brush sliding portion 3 with the adhesive 11 having the structure in which the pressure sensitive adhesive 8 is applied to both sides of the base material 10. Compared with the example of FIG. The decrease in the viscosity of the pressure-sensitive adhesive is insufficient although it can be suppressed to some extent, and it is not possible to satisfy the long life at high temperature and the high quality.

The state of easy welding of the brush sliding part and the commutator segment, or the state of easy occurrence of welding, abnormal wear, and poor conduction is being elucidated in the literature and experiments so far. Abnormality is likely to occur in the atmosphere where the sliding parts of the brush and commutator segment slide.
Or it is the case where unsaturated cyclic hydrocarbons are present or adsorbed in the commutator segment itself. At this time, it promotes an abnormal phenomenon called black matter (decomposition product or carbon-like polymer that is a polymer formed by mechanochemical reaction and mixture of sliding wear particles generated between brush and commutator segment). Foreign matter is generated.

This foreign matter is due to the fact that when unsaturated cyclic hydrocarbons are burned by the arc between the sliding part and the commutator segment, they have a large amount of carbon per unit volume and incompletely burn, and also due to their molecular structure. However, it seems that hard carbon is formed because the bonded state of the generated carbon becomes dense.

Also, in the adsorption of hydrocarbons other than unsaturated cyclic hydrocarbons and adsorption to commutator segments, it is due to the molecular structure, but the generated carbon becomes soft, which does not lead to abnormal phenomena. Has been done. The ambient temperature of this equipment is -10 ℃ to + 60 ℃.
Many are used at ℃.

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention The present invention is intended to prevent abrasion of a brush / commutator caused by sliding of a brush and a commutator of a motor, abrasion damage due to welding, and shortening of a motor life due to mechanical wear.

Means for Solving the Problems In order to solve the above problems, the present invention provides a small motor having a brush mechanism and a commutator, and a structure in which the brush and the commutator slide, in which a gas-permeable film or case is formed of an organic material. A chemical is enclosed and placed in or near the motor case, and the thickness of the film or case is changed according to the boiling point of the organic chemical so as to control the evaporation speed of the organic chemical. is there. The following are suitable as the organic chemicals.

1) Paraffins 2) Monoalcohols having a single -OH group 3) Polyhydric alcohols having a plurality of -OH groups 4) Ethers having a plurality of or a plurality of -O- bonds 5) Cyclic ethers 6) Ketones having one or more —CO— bonds 7) Ether alcohols having one or more —OH groups and —O-bonds 8) Ester alcohols having one or more —OH groups and —COO- bonds 9) Esters having a single or plural —COO- bond 10) Amino alcohols having a single or plural —OH group and a —NH ₂ group 11) Fatty acids having a single or plural —COOH groups 12) Single or amide having a plurality of -CONH- bond 13) one or more primary amines having a -NH ₂ group 14) secondary amines 15 with one or more of -NH- bond) one or more N≡ Tertiary amines having the interleaf 16) s Imidazoles or imidazolines 17) As a method for attaching at least one or more chemicals among oxymonocyclic terpenes ... abbreviated as chemicals ... 1) As a method for slowing the evaporation speed of chemicals, polyethylene or the like is used. Encapsulation in a gas permeable film or case.

2) As a method to accelerate the evaporation speed of chemicals, it is enclosed in a gas permeable film such as polyethylene or a case, or is impregnated in the gap between the magnet, magnet wire, felt or sponge, magnet and case, and made of plastic. Bracket, plastic commutator base, metal oil, vibration-proof rubber, adhesive for vibration-proof rubber, etc. blended with the motor mechanism member, and heat the enclosed case part, impregnation part and blended part A method of providing a device.

3) As a method of slowing down the evaporation speed of chemicals, it is enclosed in a gas permeable film such as polyethylene or a case, or is impregnated in the gap between the magnet, magnet wire, felt or sponge, magnet and case, and made of plastic. Brackets, plastic commutator bases, metal oil, vibration-proof rubber, blended with motor mechanism members such as adhesive for vibration-proof rubber, and cooling these enclosed case parts, impregnated parts and blended parts There is a method of providing the device.

By these methods, the inside of the motor case can be made to have a chemical atmosphere. In addition, in order to simplify the motor configuration, a configuration may be used in which the chemical is directly applied to the brush or the brush sliding portion.

Action The present invention, in order to change the thickness of the film or the like in accordance with the boiling point of the organic chemical, suppresses unnecessary evaporation of the organic chemical,
The effect can be connected for a long time.

In addition, when such a chemical is used, it is different from unsaturated cyclic hydrocarbons in terms of its molecular structure. Therefore, it is the most distant from the formation of hard black matter, which is one of the above phenomena, and carbon is generated. Becomes extremely soft, and the sliding resistance of the brush sliding part and the commutator segment can be reduced.

Also, for example, even at high temperature and low humidity where the probability of abnormal phenomena is high, an atmosphere matching the vapor pressure of the chemical can be obtained in the motor case, and the polar group of the chemical strongly adheres to the metal surface, A sufficient effect can be obtained.

In addition, the small motor to be distributed with the chemicals has a structure close to that of a closed structure with little air circulation, or the device itself in which the small motor is incorporated has a structure with little air circulation to obtain better results.

In the adsorption of chemicals, not only commutator segments and brushes using Au, Pd, Pt, Ag, etc. and their alloys with strong catalytic action, but also brushes made of Cu, the surface of sintered carbon brush, It also adsorbs to the surface of other metal parts constituting the motor to prevent the highly reactive gases such as styrene monomer and toluene from adhering to the surface. This is because the chemical is more strongly adsorbed than the organic gas adsorbed due to the attractive force of van der Waals such as styrene monomer and toluene.

Even if there are some impurities in the components of the drug, the drug exerts a remarkable effect. It has been proved that even if the toluene or styrene monomer is mixed in the atmosphere of the chemical, the effect is remarkable.

Examples of substance names and properties of drugs effective in the present invention are shown below, but this does not limit the names of drugs. The temperature that is not mentioned is the boiling point under one atmospheric pressure.

1) Paraffins. (Chemical-1) 1-1) 2.2.4 Trimethylpentane. … 99.2 ° C.

1-2) n-decane. … 174.1 ℃.

1-3) n-dodecane. … 216.3 ° C.

1-4) Tetradecane. … 253.6 ℃.

2) Monoalcohols having a single -OH group. (Chemical-
2) 2-1) n-propyl alcohol. … 97.2 ° C.

2-2) Isopropyl alcohol. … 81.5-83.0 ° C 2-3) Isobutyl alcohol. … 106-109 ° C 2-4) Isoamyl alcohol. … 128-132 ° C 2-5) Cyclohexanol. … 160 to 162.4 ° C 2-6) 2.4 dimethyl / 3-pentanol 138.4 ° C 2-7) 3-methyl / 3-pentanol. … 122.4 ° C 2-8) 3 ethyl 3 pentanol. … 143.1 ° C 2-9) Diacetone alcohol. … 167.4 ° C.

2-10) n-octanol. … 193-16.0 ° C 2-11) 2 ethylhexanol. … 183.5 ° C.

2-12) Tetrahydrofurfuryl alcohol. 177
-178.0 ° C (boiling point 2-13 at 743 mmHg) 1.3 dimethoxy-2 propanol. 169.0
° C.

2-14) 1-methyl / 1-cyclohexanol 168.0 ° C 2-15) 7-mentanol. …… 236.0 ℃.

2-16) Isopropylbenzyl alcohol 246.0 ° C. 2-17) Isobutylcarbinol. … 176-184 ° C 2-18) Benzyl alcohol. … 205.4 ℃.

3) Polyhydric alcohols having a plurality of -OH groups. (Chemical-
3) 3-1) Propylene glycol. … 187 ° C.

3-2) Ethylene glycol. … 197 ° C.

3-3) 1,3 butanediol ... 205-210 degreeC 3-4) 2.3 butanediol ... 182 degreeC.

3-5) 1.4 butanediol ... 228 ° C.

3-6) 4 Methyl 1.2 propanediol 182 ° C. 3-7) 2 Methyl 2.3 butanediol. ...... 177.
5 ° C (boiling point at 750 mmHg) 3-8) 1.5 pentanediol. … 242.5 ° C.

3-9) 1.6 hexanediol. … 134 ℃ (10mmHg
Boiling point under) 3-10) 2.5 hexanediol. … 218 ° C.

3-11) Diethylene glycol. … 250 ° C.

3-12) 2 Methyl 2.4 pentanediol 197.4 ° C. 3-13) 2 Ethyl 1.3 hexanediol. 240 ~ 250
° C.

3-14) Dipropylene glycol. … 215-245 ° C.

3-15) Glycerin. … 290 ° C.

4) Ethers having one or more —O— bonds.
(Chemical-4) 4-1) n-butyl ether. … 143 ° C.

4-2) Isoamyl ether. … 173.2 ° C.

5) Cyclic ethers. (Chemical-5) 5-1) 1.4 dioxane. … 101.4 ° C.

5-2) 1.3 dioxane. … 106 ° C.

6) Ketones having one or more —CO— bonds.
(Drug-6) 6-1) Cyclopentanone. … 130.7 ° C.

6-2) 2 octanone. … 174 ℃.

6-3) 2 nonanone. … 195 ° C.

6-4) Isophorone. … 215.2 ° C.

6-5) 2 Undecanone. … 229 ° C.

7) Ether alcohols having one or more —OH groups and —O— bonds.

(Chemical agent-7) 7-1) Ethylene glycol monoethyl ether. …
… 134.8 ° C.

7-2) Ethylene glycol monobutyl ether 167
~ 173 ° C.

7-3) Ethylene glycol dibutyl ether. ......
203.6 ° C.

7-4) Ethylene glycol monohexyl ether.
… 208.1 ℃.

7-5) 1.3 dimethoxy 2 propanol. … 169 ° C.

7-6) Diethylene glycol monomethyl ether.
… 194.2 ° C.

7-7) Diethylene glycol monoethyl ether.
… 195 ° C.

7-8) Diethylene glycol monobutyl ether.
… 230 ° C.

7-9) Tripropylene glycol monomethyl ether 242.5 ° C.

7-10) alkane (or alkene) (C ₆ -C ₂₄₎ mono- (polyoxyalkylene) ethers of diols. A representative of these chemicals is shown below: 7-10-1) Hexylene glycol 1-mol ethylene oxide addition product ... Chemicals 1 7-10-2) Hexylene glycol 1-mol propylene oxide addition product …… Chemical agent 2 7-10-3) Hexylene glycol with 2 moles of ethylene oxide ………… Chemical agent 3 7-10-4) Hexylene glycol with 2 moles of propylene oxide …… Chemical agent 4 7-10-5 ) Hexylene glycol 4-mol addition product of propylene oxide ... Chemicals 5 7-10-6) Hexylene glycol 2-mol addition product of ethylene oxide 1-hexene oxide addition product ...
……… Chemical 6 Thermogravimetric analysis (TG) value Is. The chemical may be mixed with some diether or unreacted chemical during the synthesis process. Water absorption is at 40 ℃, 90% RH, 760mmHg. The conditions for thermogravimetric analysis were as follows: temperature rising rate, 5 ° C / min.
-20 mg, air flow rate 50-60 ml / min.

8) Ester alcohols having one or more —OH groups and —COO— bonds.

(Chemical-8) 8-1) Ethyl lactate. … 154 ℃.

8-2) Ethyl glycolate. … 160 ° C.

8-3) 2-hydroxyethyl acetate. 188 ° C. 8-4) Diethyl L-malate. … 253 ℃.

9) Esters having one or more —COO— bonds. (Chemical-9) 9-1) Dimethyl succinate. … 195 ° C.

9-2) Ethyl octanoate. … 208 ° C.

9-3) Diethyl fumarate. … 214 ° C.

9-4) Diethyl decanoate. … 242 ℃.

9-5) Diethyl adipate. … 245 ° C.

9-6) Methyl tartrate. … 280 ° C.

9-7) Diethyl tartrate. … 280 ° C.

10) Amino alcohols having one or more —OH groups and —NH ₂ groups.

(Chemical-10) 10-1) Diethyl ethanolamine. … 163 ° C.

10-2) Dibutyl ethanolamine. … 199 ℃.

11) Fatty acids having one or more —COOH groups (drug-11) 11-1) Pivalic acid. … 164 ° C.

11-2) Isocrotonic acid. … 169 ° C.

11-3) Isovaleric acid. … 177 ℃.

11-4) Adipic acid. … 205.5 ° C.

11-5) Hexanoic acid. … 205.8 ℃.

11-6) n-Octanoic acid. … 239 ℃.

11-7) Crotonic acid. … 189 ℃.

12) Amides having one or more -CONH- bonds.
(Chemical agent-12) 12-1) n-ethylacetamide. … 205 ° C.

13) Primary amines having one or more —NH ₂ groups.
(Chemical-13) 13-1) 2 octane amine. … 163-164 ℃.

13-2) Octylamine. … 188 ° C.

13-3) Hexylamine. … 130 ° C (boiling point at 762 mmHg) 13-4) 1.6 Hexanediamine. … 81.5 ° C (boiling point at 10 mmHg) 14) Secondary amines having one or more —NH— bonds. (Chemical-14) 14-1) Dibutylamine. … 160 ° C.

14-2) Dicyclohexyl ammonium nitrite 25
5.8 ° C.

15) Tertiary amines having one or more N≡ bonds.
(Drug-15) 15-1) Tripropylamine. … 157 ° C.

15-2) Tributylamine. … 212 ° C.

15-3) 3-methyl / 2-oxazolidinone ... 87-90 ° C (1m
Boiling point in mHg) 16) Single or multiple Imidazoles or imidazolines. (Chemical agent-16) 16-1) 2 ethyl / 4 methyl imidazole. 44 ~ 55 ℃
(Melting point at 1 atm) 16-2) 2 ethyl / 4 methyl imidazoline.

111 ° C (boiling point at 15 mmHg) 16-3) 2 ethyl imidazoline.

110 ° C (boiling point at 15 mmHg) 16-4) 2.4 Dimethyl imidazoline. … 108 ℃ (15mmH
Boiling point in g) 16-5) 1,2,3 Benzotriazole. … 93 ° C (melting point at 1 atm) 17) Oxymonocyclic terpenes.

(Chemical-17) 17-1) γ-terpineol. … 114-115 ° C (boiling point under 1 atm) 17-2) β-terpineol. … 209-210 ° C (boiling point at 752mmHg) 17-3) α-terpineol. … 219-221 ℃.

17-4) Terpinene 4ol ... 209-212 ° C.

17-5) Maltor. … 93 ° C (sublimation temperature under 1 atmosphere) 17-7) 1-menthol. ... 215.5 ° C (sublimation temperature under 1 atm) 17-8) d-camphor. … 209 ° C (sublimation temperature under 1 atm). The chemical may be mixed with some impurities or unreacted chemical.

The above-mentioned chemicals are adsorbed on the surfaces of the brush and the commutator segment to form a monomolecular film, so that the lubricity is extremely improved and the wear of the contact portion is significantly reduced.

As a method of attaching the chemicals to the motor, (1) As a method of delaying the evaporation speed of the chemicals, a method of enclosing it in a gas permeable film such as polyethylene or a case controls the evaporation speed to about 1/2 to 1/10. Since the evaporation speed can be controlled according to the boiling point of the chemical, the effect can be maintained for a long time.

(2) As a method for accelerating the evaporation speed of chemicals, a gas permeable film such as polyethylene or one enclosed in a case, a magnet, a magnet wire, felt or sponge, one impregnated in the gap between the magnet and the case, and one made of plastic A device that heats the blending case part, the impregnation part, and the blend part, which is blended with the motor mechanism member such as bracket, plastic commutator base, metal oil, anti-vibration rubber, and adhesive for attaching anti-vibration rubber. In the method including, it is possible to promote the evaporation of a chemical having a slow evaporation speed and a high boiling point, and raise the vapor atmosphere concentration of the chemical to a practical concentration.

(3) As a method of delaying the evaporation speed of chemicals, the method of providing a device having a cooling or adiabatic effect in place of the heating device of (2) described above suppresses evaporation of chemicals with a high evaporation speed (low boiling point) and is practically used. It can be lowered to a possible value.

FIG. 1 (a) is a structural diagram of an embodiment of the present invention by the installation method (1). Here, parts having the same names as those in FIGS. 5 and 6 are given the same reference numerals. Further, 14 is a bracket for holding the brush 13 and the like, 15 is a lower part of the motor case, and 16 is a polyethylene pack for enclosing the chemicals.

FIG. 1 (b) is a half sectional view of the polyethylene pack 16, wherein 23 is a back case, 24 is a permeable membrane, and 27 is a chemical.

FIG. 2 (a) is a structural view of an embodiment of the present invention by the attaching method (3), in which the polyethylene pack 16 of FIG. 1 is wrapped with a heat insulating sheet 25. FIG. 2B is a sectional view of the polyethylene pack 16 wrapped with a heat insulating sheet 25.

FIG. 3 (a) is a structural diagram of an embodiment of the present invention according to the installation method (2). A porous field magnet 21 in a motor case is impregnated with a chemical, and a sheet-like heater 17 is provided in the vicinity thereof. Is attached. Fig. 3 (b)
Shows a plan view of FIG. 3 (a), and FIG. 3 (c) shows a sheet-like heater 17.

FIG. 7 shows the result based on the installation method of the present invention. Comparative examples (1) to (3) are current products and comparative examples for comparison with the effects of the present invention.

The material of the film used here is not limited as long as it has gas permeability. Further, its form is not limited to the above embodiment.

Example A long-term operation experiment was conducted using a commutator segment in which a very small amount of hydrocarbon was adsorbed. The results are shown in the table below.

In this experiment 1) There is a high probability that abnormal wear will occur in the commutator segment when the temperature and humidity are low.

2) When approximately 10 μg of styrene monomer or unsaturated cyclic hydrocarbon such as toluene is adsorbed on the commutator segment, the abnormality of the commutator segment is alleviated and the life of the small motor is extended. However, this is the data when there is no continuous supply of hydrocarbons such as styrene monomer and toluene.

Explaining FIG. 7 in detail, a) is the rectified waveform of the current product before the test in the atmosphere of 60 ° C. and 5% RH before the test, the rectified waveform of Comparative Example 1 after the 300 hour test, and b) is not. A rectified waveform in a saturated cyclic hydrocarbon styrene monomer atmosphere at 60 ° C. before a 5% RH atmosphere test and a rectified waveform of Comparative Example 2 after a 100-hour test.

c) 60 when unsaturated cyclic hydrocarbon (toluene) is adsorbed on the commutator segment surface at about 10 μg
Rectification waveform before 5 ° C RH atmosphere test and rectification waveform of Comparative Example 3 after 300 hours test, d) is 60 ° C in the atmosphere of hexylene glycol (impregnated porous magnet with hexylene glycol) % Rectified waveform before atmosphere test and rectified waveform of Example 1 after 1500 hours test, e) is hexylene glycol (hexylene glycol in a polyethylene film pack) atmosphere at 60 ° C., 5% atmosphere test Previous rectified waveform and 1500
The rectified waveform of Example 2 after the time test, f) is 60 ° C. in the atmosphere of hexylene glycol (where hexylene glycol was put in a polyethylene film pack and further provided a cooling effect), before 5% atmosphere test Rectification waveform and rectification waveform of Example 3 after 1500 hours test, g) shows hexylene glycol with 4 mol of ethylene oxide added (hexylene glycol with 4 mol of ethylene oxide impregnated into a porous magnet). In the atmosphere of 60 ° C., a rectified waveform before 5% atmosphere test and a rectified waveform of Example 4 after 1500 hours of test, h) is obtained by adding 4 mol of ethylene oxide to hexylene glycol (4 mol of ethylene oxide to hexylene glycol). Impregnated part with a porous magnet impregnated with the added one 60 ° C. in an atmosphere of those) with a heating device, of 5% atmosphere of tests before rectified waveform and 15
Rectified waveform of Example 5 after 00 hour test.

The motor used for the test will be described with reference to FIG. This motor is a DC motor, and its rated output is 30mm in outer diameter and 25mm in height.
0.1W, the operating condition during the test is 4.2V DC, 25mA.

The sintered porous field magnet 21 as in Example 1) impregnated with (hexylene glycol) has a holding power of 0.1 g to 0.3 g, and the evaporation speed is appropriate and a remarkable effect can be obtained. I can. Also, blended with the plastic bracket 14, blended with the plastic commutator base 5, impregnated with the magnet wire 19, blended with the metal oil of the upper metal 18 and the lower metal 7 parts. Chemicals are also retained by those impregnated in the gap between the magnet 21 and the motor case 22, blended with the anti-vibration rubber 9 in FIG. 5, blended with the anti-vibration rubber sticking adhesive 8 in FIG. It is possible to secure the power to operate and an appropriate amount of evaporation, and to obtain a remarkable effect. However, the effect can be expected 60
The limit of leaving a small motor in a ℃ atmosphere is 500 hours or less, which is somewhat unsustainable.

The hexylene glycol of Example 2) enclosed in a gas-permeable film or case such as polyethylene (polyethylene is preferably a high-density polyethylene or low-density polyethylene film having a thickness of 10 to 200 μm) is It was confirmed that the evaporation speed can be changed from 1/2 to 1/10 by changing the thickness of the film as compared with the non-encapsulated product, and more than necessary evaporation is suppressed and the effect can be maintained for a long time.

In this embodiment, it is most effective to pack the film with a thickness of 30 to 60 μm, but this range varies depending on the chemicals, and the film thickness is not limited to the above range.

The product of Example 3) in which hexylene glycol is put in a polyethylene pack and having a cooling effect has an effect of suppressing the temperature rise of chemicals due to an increase in ambient temperature, and further suppresses the evaporation speed as compared with the above Example 2). It is possible to adjust the cooling effect according to the increase of the ambient temperature, and it is possible to create the above-mentioned atmosphere of the optimum chemicals according to the temperature. Although an example in which a heat insulating material is used has been shown as a method of providing a cooling effect, the means is not limited to this example.

Example 4) is similar to Example 1) in that the porous magnet 21 is obtained by adding 4 mol of ethylene oxide to hexylene glycol, that is, impregnated with one having a higher boiling point than in Example 1). However, the life effect is inferior at -10 ℃.

The one obtained by impregnating the porous magnet with the chemical of Example 5) of Example 5) and attaching the heater to it promotes the evaporation of the chemical having a lubricating effect at a low temperature and obtains the vapor atmosphere of the necessary chemical. It is possible to obtain a sufficient evaporation speed, and it has a great effect for a long time. Also,
A wide range of ambient temperature changes can be handled by turning the heater on and off or adjusting the voltage.

The following table shows these results.

EFFECTS OF THE INVENTION 1) The one enclosed in a gas permeable film such as polyethylene or a case has an evaporation speed of about 1/2 to 1/10 and can keep the effect for a long time.

As a result, it has a low molecular weight and a low boiling point, for example 160 ° C to 180 ° C.
Practical use of even the above chemicals.

2) A gas permeable film such as polyethylene, or one enclosed in a case, magnet, magnet wire, felt or sponge, one impregnated in the gap between the magnet and the case, and a plastic bracket,
Plastic commutator base, metal oil, anti-vibration rubber,
Those that are blended with a motor mechanism member such as an anti-vibration rubber sticking adhesive and those that are equipped with a device that heats the encapsulation case part, the impregnation part, and the blend part are made of higher polymer Chemicals with a high boiling point, such as chemicals with a boiling point of 240 ° C or higher, can be put into practical use.

3) Gas-permeable film such as polyethylene, enclosed in a case, magnet, magnet wire, felt or sponge, impregnated in the gap between magnet and case, and bracket made of plastic,
Plastic commutator base, metal oil, anti-vibration rubber,
For products that are blended with motor mechanism members such as anti-vibration rubber sticking adhesives and devices that cool the enclosing case part, impregnation part and blend part, the evaporation speed slows in proportion to its cooling capacity You can keep the effect. For this reason, it is possible to use chemicals with a lower boiling point of smaller molecules, such as boiling point 16
It can be used for chemicals up to 0 ° C.

4) Adhesion of chemicals to the surfaces of brushes and commutator segments has the effect of preventing abnormal wear and welding of the contact surface due to lubrication and resulting scratch damage.

5) Even if there is an organic gas having a benzene ring such as styrene monomer or toluene, it is protected by the film of the chemical adsorbed on the surface of the brush and commutator segment, and the generation of black matter is minimal, resulting in poor contact between the brush and commutator segment. Can be prevented. In addition, because contact failure does not occur, the generation of electrical noise is reduced, the speed of the small motor is stabilized, and as a result, equipment that uses a small motor for relatively low voltage of about 1 to 30V. Reduce wow and flutter.

6) Operating voltage commonly used due to lubrication of chemicals: 1 to 30V When operating a micromotor with a current value of around 100mA in a chemical atmosphere, the current value decreases by 5 to 10% and energy saving can be achieved.

7) The chemical has a dampening effect that suppresses the vibration generated by the sliding motion of the brush and commutator, and enables the reduction of mechanical noise by 1 to 10%. That is, it has almost the same sound deadening effect as the anti-vibration rubber normally attached to the brush.

[Brief description of drawings]

FIGS. 1, 2 and 3 are structural views of a motor according to an embodiment of the present invention, FIG. 4 is a half sectional structural view of a motor of the embodiment, and FIG. 5 is a general brush and commutator. 6A to 6C are diagrams showing a typical configuration of a brush sliding part of a comparative example, and FIGS.
(A)-(h) is a figure which shows the commutation waveform diagram of the motor of a comparative example and the Example of this invention. 2 ... Brush base. 3 ... Brush sliding part. 4 ... Commutator segment. 5: Commutator base. 6 ... Shaft. 7 ... Lower metal. 8 ... Upper metal. 13 …… Brush. 14 …… Bracket. 15 …… Under the motor case. 17 ……
heater. 19 …… Magnet wire. 20 ...... rotor,
21 …… Field magnet. 22 …… Case. 23 …… Pack case. 24 …… Transparent membrane. 25 ... Insulation sheet. 26 ……
Lead. 27 ... chemicals.

Claims (3)

[Claims] 1. A small-sized motor having a brush mechanism and a commutator, in which the brush and the commutator slide, wherein an organic chemical is sealed in a gas-permeable film or case, and the motor is provided in or near the motor case. A method of manufacturing a small motor, in which the thickness of the film or case is changed according to the boiling point of the organic chemical so as to control the evaporation speed of the organic chemical. 2. A method of manufacturing a small motor according to claim 1, further comprising means for heating a film or case in which an organic chemical is enclosed. 3. A method for manufacturing a small motor according to claim 1, further comprising means for cooling the film or case in which the organic chemical is enclosed.