JP2000245180A - Thin micromotor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To drive a very thin micromotor at high speed by forming a rotating body, so that the diameter of the rotating body is formed larger than the largest thickness of the rotator body, forming an enclosure so that the diameter/ thickness of the enclosure is not less than a specific value, and providing a contact portion with a means for reducing the rotational resistance of a rotary shaft. SOLUTION: A rotating body 30 is formed with the diameter of the rotating body 30 larger than the maximum thickness of the rotating body 30. An enclosure 40 is formed with the diameter/thickness of the enclosure 40 of not less than 1.01. A rotational contact resistance reducing means for reducing the rotation resistance of a rotary shaft 45 is installed at least one of groups comprising the rotary shaft 45, a shaft hole and a bearing assembly. As a result a very thin and yet small-sized micromotor is obtained. The contact frictional resistance at a driving portion is very much reduced, and the micromotor can be driven at a rotational speed of tens of hundreds to tens of thousands of rpm and hardly produces heat, when rotated at such a high speed. Furthermore, the micromotor can be driven normally even in an environment of a strong magnetic field.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electro-sensitive working medium (electric conjugate fluid) which moves between electric fields by applying a voltage.
(Electro-Conjugate Fluid = ECF)). More specifically, the present invention relates to a very thin micromotor using an electro-sensitive working medium having the above characteristics.

[0002]

BACKGROUND OF THE INVENTION It is known that the properties of a liquid can be changed by applying an electric field to the insulating liquid. For example, the liquid crystal changes its orientation by the application of a voltage, and its light transmittance changes. It is also known that when a voltage is applied to a heterogeneous liquid containing particles and the like, characteristics such as viscosity change due to the Winslow effect.

[0003] However, such liquids whose characteristics fluctuate due to the application of a voltage have problems such as extremely expensive liquid crystal compounds and poor dispersion stability like heterogeneous liquids.

The present inventor has found a new electro-sensitive effect that the specific fluid moves by applying a voltage to the specific liquid, and the specific liquid (electro-sensitive operating medium) and the electro-sensitive operating An application for a micromotor using a medium has already been filed (Japanese Patent Application No. Hei 8-1687).
No. 1, Japanese Patent Application No. 8-16872, Japanese Patent Application No. 8-76259
No., Japanese Patent Application No. 8-248417, and Japanese Patent Application No. 8-24167.
No. 9, etc.). The output power density of the micromotors described in these specifications is increased by miniaturization.

[0005] However, the micromotor disclosed in the above specification requires an improvement in miniaturization because the driving section is cylindrical.

The present inventor has manufactured a thin micromotor using a disk-shaped rotating body, and has succeeded in driving such a thin micromotor at a rotation speed of about 300 rpm (Japanese Patent Application No. Hei 10 (1998) -108). -11832).
However, in such a thin micromotor,
The number of revolutions tends to be lower than that of a micromotor having a cylindrical rotor. As a result of various studies on the phenomenon of a decrease in the number of revolutions of such a thin micromotor, a disk-shaped rotating body is used in such a thin micromotor, and a shaft is rotatable with respect to the rotating body and the housing. The error with the rotating shaft to stop tends to be larger than when a cylindrical rotor is used, and the contact resistance between the rotating shaft and the bearing tends to increase, and the rotational speed decreases due to this contact resistance. I knew it was. In particular, as the micromotor becomes smaller, the energy loss due to the contact resistance to the output becomes not negligible, and it has been found that the structure of the bearing part in which such contact resistance occurs becomes very important for driving the micromotor at high speed. did.

[0007]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a very thin micromotor which rotates an electro-sensitive working medium by applying a DC voltage and rotates by the flow of the electro-sensitive working medium.

Another object of the present invention is to provide a thin micromotor that can be driven at a high speed.

[0009]

SUMMARY OF THE INVENTION A thin micromotor according to the present invention comprises a housing comprising a bottomed medium storage portion for storing an electro-sensitive operating medium and a lid for sealing an upper opening of the medium storage portion;
A rotating shaft that is supported by a shaft hole provided in the center of the lid and a bearing at the center of the bottom of the medium container, a rotating body that is fixed to the rotating shaft and rotates together with the rotating shaft, An electrode forming a moving flow of the electro-sensitive working medium, wherein a diameter of the rotating body is formed larger than a maximum thickness of the rotating body, and a diameter of the housing / a diameter of the housing. A rotational contact resistance reducing means having a thickness of 1.01 or more and reducing the rotational resistance of the rotating shaft,
It is provided on at least one contact portion selected from the group consisting of a rotating shaft, a shaft hole, and a bearing portion.

[0010] The thin micromotor of the present invention has an SE-type ECF motor (Sta.
tor-electrode type electro-conjugate fluid motor)
And RE-type ECF motor (Rotor-electrode type electro-
conjugate fluid motor). Here, in the SE type ECF motor, the electrode is electrically responsive to any one of the upper surface of the bottom of the medium housing, the bottom of the lid, and the inner peripheral surface of the side wall of the housing which is the medium housing, or at least two places. It is a micromotor stretched in contact with the working medium,
The RE-type ECF motor is a micromotor in which the electrodes are provided on the upper surface and / or the lower surface of the rotating body.

In the thin micromotor of the present invention, the maximum diameter of the housing is generally 50 mm or less, and the maximum thickness of the housing is 5 mm or less.
Less than 0 mm, preferably a few mm, significantly smaller,
Particularly thin. Despite its small size,
The thin micromotor of the present invention can rotate at a high speed of several hundred revolutions / minute or more.

Since the contact portions such as the rotating shaft, the shaft hole and the bearing portion are provided with means for reducing the rotational contact resistance, it is possible to prevent a reduction in the rotational speed of the rotating body due to a reduction in size and thickness. Can be.

Furthermore, the thin micromotor of the present invention
By using a homogeneous electro-sensitive working medium containing a specific halogen compound, particularly a fluorine compound, as the electro-sensitive working medium, the electro-sensitive working medium does not deteriorate even when the thin micromotor of the present invention is driven. ,Also,
Even if a spark is generated by applying a voltage, the electro-sensitive working medium does not ignite.

[0014]

Next, the thin micromotor of the present invention will be described in detail.

The electro-sensitive working medium used in the present invention is a liquid capable of generating a flow between the electrodes according to an applied voltage.

The electro-sensitive working medium used here is an organic compound which is liquid at a working temperature capable of forming a moving flow between the electrodes in response to an applied voltage, and which is substantially insulative. is there. Further, it is preferable to use a homogeneous electro-sensitive working medium containing a halogen compound having a specific conductivity and surface tension, particularly an organic compound having a fluorine atom.

Examples of compounds forming such an electro-sensitive working medium are shown below.

(1) Dibutyl adipate (DBA) (2) Tributyl citrate (TBC) (3) Monobutyl maleate (MBM) (4) Diallyl maleate (DAM) (5) Dimethyl phthalate (DMP) (6) Triacetin

[0019]

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(7) Ethyl cellosolve acetate (8) 2- (2-ethoxyethoxy) ethyl acetate (9) 1,2-diacetoxyethane (10) Triethylene glycol diacetate (11) Butyl cellosolve acetate (12) Butyl carbitol acetate (13) 3-Methoxy-3-methylbutyl acetate (Solfit AC) (14) Dibutyl fumarate (DBF) (15) 2-Ethylhexylbenzyl phthalate (trade name;
Plasizer B-8) (17) Propylene glycol methyl ether acetate (PMA)

[0021]

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(18) Methyl acetyl ricinoleate (MA
RN)

[0023]

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(19) 2-Ethylhexyl palmitate (trade name: Exepearl EH-P) (20) Dibutyl itaconate (DBI)

[0025]

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(21) Polyethylene glycol monooleate (trade name: Emanone 4110) (22) Butyl stearate (trade name: Exepearl B)
S) (23) 2,2,4-trimethyl-1,3-pentanediol diisobutyrate (trade name: Kyowanol D)

[0027]

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(24) 2,2,4-trimethyl-1,3-pentanediol monoisobutyrate (trade name: Kyowanol M) (25) propylene glycol monoethyl ether (26) propylene glycol ethyl ether acetate (product Name: BP-ethoxypropyl acetate)

[0029]

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(27) 9,10-Epoxybutyl stearate (trade name: Sansocizer E-4030)

[0031]

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(28) Dioctyl terolahydrophthalate (trade name: Sansocizer DOTP) (29) Tributyl phosphate (TBP) (30) Tributoxyethyl phosphate (TBXP) (31) Tris (chloroethyl) phosphate (CLP) ( 32) Ethyl 2-methylacetoacetate (33) 1-ethoxy-2-acetoxypropane (34) 2- (2,2-dichlorovinyl) -3,3-dimethylcyclopropanecarboxylic acid methyl ester (DC
M-40)

[0033]

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(35) Linalyl acetate

[0035]

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(36) Dibutyl decandioate (37) Trade name; Kyowanol-M: trade name; Exepearl EH-P = 1: 4 mixture (Kyouwanol-M = 2,2,4-trimethyl-1,3 , -Pentanediol monoisobutyrate exepal EH-P = butyl stearate (38) DAM: trade name; exepal BS = 1: 4 mixture DAM = diallyl maleate exepal BS = butyl stearate (39) dibutyl dodecane diacid ( Bu-OCO- (CH ₂ ) ₅ -CH (Bu)-
COO-Bu) (DBDD) (40) Dibutyl docosantioate [Bu-OCO- (CH ₂ ) ₆ -CH (C
_{H 3) - (CH 2)} 4 -CH (CH 3) - (CH 2) 6 -COO-Bu].

The above compounds can be used alone or in combination.

For such a compound, for example, at 25 ° C.
The measured values of the electrical conductivity and the viscosity in Table 1 show values as shown in Table 1 below.

[0039]

[Table 1]

As the electro-sensitive working medium used in the present invention, it is preferable to use a compound or a mixture whose electric conductivity and viscosity at the operating temperature are within the following specific ranges.

That is, when the electric conductivity σ and the viscosity η at a field strength of 2 kVmm ^-1 and a temperature of 25 ° C. are measured for a liquid called an insulating liquid including the above compound, FIG.
Are distributed as shown in FIG.

In the present invention, the compound used as the electro-sensitive working medium has a viscosity on the vertical axis and a conductivity on the horizontal axis (FIG. 1). It is preferable that the compound is a compound having viscosity and conductivity located inside a right triangle having the following points P, Q and R as vertices, or a mixture of two or more kinds of electro-sensitive working media. in case of,
It is preferably a mixture of two or more compounds prepared to have a viscosity and conductivity located inside the triangle.

[0043]

[Table 2]

In the above Table 2, the points P ⁰ , Q ⁰ , R
⁰ indicates a particularly preferred range in the electro-sensitive working medium used in the present invention.

Specific examples of preferred compounds as the electro-sensitive working medium in the thin micromotor of the present invention are shown below.

(1) Dibutyl adipate (DBA) (σ = 3.01 × 10 ⁻⁹ S / m, η = 3.5 × 10 ⁻³ Pa · s), (6) Triacetin (σ = 3 .64 × 10 ⁻⁹ S / m, η = 1.4 × 10 ⁻² Pa · s), (11) Butyl cellosolve acetate (σ = 2.10 × 10 ⁻⁸ S / m, η = 7.0 × 10 ^-4 Pa · s), (12) Butyl carbitol acetate (σ = 5.20 × 10 ⁻⁸ S / m, η = 1.7 × 10 ⁻³ Pa · s), (13) 3-methoxy-3 -Methylbutyl acetate (Solfit AC) (σ = 8.30 × 10 ⁻⁸ S / m, η = 6.0 × 10 ⁻⁴ Pa · s), (14) dibutyl fumarate (DBF) (σ = 2 .65 × 10 ⁻⁹ S / m, η = 3.5 × 10 ⁻³ Pa · s), (17) Propylene glycol methyl ether acetate (PMA) (σ = 1.56 × 10 ⁻⁷ S / m, η) = 6.0 × 10 ⁻⁴ Pa · s), (18) Methylacetyl ricinoleate (MAR-N) (σ = 1.30 × 10 ⁻⁸ S / m, η = 1.3 × 10 ⁻² Pa · s) s) (20) dibutyl itaconate (DBI) (σ = 1.46 × 10 ⁻⁸ S / m, η = 3.5 × 10 ⁻³ Pa · s), (23) 2,2,4-trimethyl-1 , 3-pentanediol diisobutyrate (trade name: Kyowanol D) (σ = 6.24 × 10 ⁻⁹ S / m, η = 4.0 × 10 ⁻³ Pa · s), (26) propylene glycol ethyl Ether acetate (trade name: BP-ethoxypropyl acetate) (σ = 3.10 × 10 ⁻⁸ S / m, η = 6.0 × 10 ⁻⁴ Pa · s), (27) 9,10-epoxybutyl steer Rate (trade name: Sansocizer E-4030) (σ = 5.46 × 10 ⁻⁹ S / m, η = 2.0 × 10 ⁻² Pa · s), (28) dioctyl ester of terahydrophthalic acid (product) Name: Sansocizer DOTP) (σ = 6.20 × 10 ⁻¹⁰ S / m, η = 4.0 × 10 ⁻² Pa · s), (33) 1-ethoxy-2-acetoxypropane (σ = 4. ^{41 × 10 -7 S / m,} η = 4.0 × 10 -4 Pa · s), (35) Rinariruasete Doo ^{(σ = 1.82 × 10 -9 S} / m, η = 1.3 × 10 -3 Pa · s) (36) decanedioic dibutyl ^{(σ = 1.40 × 10 -9 S} / m, η = 7.0 × 10 ⁻³ Pa · s) (39) Dibutyl dodecane diacid (DBDD) (σ = 5.2 × 10 ⁻⁹ S / m, η = 9.3 × 10 ⁻³ Pa · s) ( 40) Dibutyl docosantioate (σ = 1.04 × 10 ⁻⁹ S / m, η = 2.5 × 10 ⁻² Pa · s) Further, a plurality of media are used as electro-sensitive working media used in the present invention. When used in combination, it is preferable that the conductivity and viscosity of the resulting mixture be within the triangle defined by points P, Q and R in FIG. can do.

That is, the relationship between the conductivity and the viscosity is such that, even if the conductivity and / or viscosity of each compound is not within the above range, a plurality of compounds are mixed and the conductivity of the mixture is determined. When the viscosity is within the above range, the composition can be suitably used as an electro-sensitive working medium.

For example, neither 2,2,4-trimethyl-1,3-pentanediol monoisobutyrate (trade name; Kyowanol M) (σ =
6.80 × 10 ⁻⁸ S / m, η = 1.2 × 10 ⁻² Pa · s) and 2-ethylhexyl palmitate (trade name: Exepearl EH−)
P) (σ = 2.60 × 10 ⁻¹⁰ S / m, η = 9.5 × 10 ⁻³ Pa ·
s) with a 1: 4 weight ratio (σ = 2.6).
0 × 10 ⁻⁹ S / m, η = 9.8 × 10 ⁻³ Pa · s) can be suitably used as the electro-sensitive working medium used in the present invention. Is not within the above range, DAM (Diallyl Maleate) (σ = 7.8 × 10 ⁻⁷ S / m, η = 2.
5 × 10 ⁻³ Pa · s) and butyl stearate (trade name: Exepearl BS) (σ = 3.1 × 10 ⁻¹⁰ S / m, η = 8.5 ×)
10 ⁻³ Pa · s) in a weight ratio of 1: 4 (σ
= 4.17 × 10 ⁻⁹ S / m, η = 5.0 × 10 ⁻³ Pa · s) can also be suitably used as the electro-sensitive working medium.

Further, the electro-sensitive working medium only needs to have the above-mentioned electric conductivity and viscosity at the temperature used in the present invention. At operating temperature,
If the conductivity and the viscosity are within the above triangle, it can be suitably used.

Although such an electro-sensitive working medium does not particularly require the addition of another substance, a stabilizer, a polymer dispersant, a surfactant or a polymer may be added to the electro-sensitive working medium. Additives such as thickeners can be included. Furthermore, as long as the electro-sensitive working medium has a conductivity and a viscosity within the above triangle, even a compound having no ester group can be used.

Further, in the present invention, it is preferable to use, as the electro-sensitive working medium, an electro-sensitive working medium containing at least one liquid organic compound having at least three fluorine atoms in a molecule. For this electro-sensitive working medium, the conductivity at the working environment temperature is 4 ×
It is preferable to use an organic compound having a surface tension within the range of 10 ^{−10 to} 5 × 10 ⁻⁶ S / m and an operating environment temperature of 22 dyn / cm or less. Such an electro-sensitive working medium usually has substantially no flash point and is flame-retardant or non-flammable.

That is, the electro-sensitive working medium used here is a homogeneous liquid substantially containing no particles or the like, and the liquid organic compound constituting the electro-sensitive working medium contains at least one molecule in one molecule. Organic compounds having 3, preferably 6 to 30, halogen atoms, especially fluorine atoms. In addition, the electro-sensitive working medium is liquid alone when used. The liquid organic compound as the electro-sensitive working medium has at least 3, preferably at least 6, halogen atoms, especially fluorine atoms, in one molecule. Usually, 30 to 100% of the number of hydrogen atoms that can be replaced by halogen atoms present in one molecule,
Preferably, it has a structure in which 35 to 100% is substituted with a halogen atom, particularly a fluorine atom. By substituting a hydrogen atom with a halogen atom, particularly a fluorine atom, the electro-sensitive working medium can be made flame-retardant or non-flammable. In particular, compounds having a structure in which 60% or more of replaceable hydrogen atoms are replaced by halogen atoms, particularly fluorine atoms, become nonflammable. Furthermore, the surface tension of the organic compound having three or more halogen atoms, particularly fluorine atoms, is reduced. That is, the surface tension of the halogen-containing electro-sensitive working medium is preferably 22 dyn / cm or less at the service temperature. Further, when the surface tension k is 10 to 2
It is preferably in the range of 0 dyn / cm. Further, the surface tension here is a value measured at the same temperature as the driving temperature at which the electro-sensitive working medium is used. In the present invention, the surface tension is a value measured by the method described in JIS-3362, but it is a matter of course that the surface tension can be measured using another commercially available surface tension measuring device. The surface tension of such a compound is controlled to some extent by the number of halogen atoms, particularly fluorine atoms, contained in one molecule (the ratio of hydrogen atoms that can be replaced by halogen atoms to halogen atoms, particularly fluorine atoms). It is possible that compounds having three or more halogen atoms, especially fluorine atoms, such as the electro-sensitive working medium, exhibit a lower surface tension than the corresponding compounds having no fluorine atom.

By having a halogen atom, especially a fluorine atom, the electro-sensitive working medium becomes flame-retardant or non-flammable, and such a compound has substantially no flash point.

Further, by having a halogen atom, especially a fluorine atom, the compound becomes flame-retardant or non-flammable and the stability of the compound is increased. Disappears.

The electro-sensitive working medium comprising such an organic compound having a halogen atom is a substantially uniform insulating material, and has a conductivity σ at an electric field strength of 2 KV / mm of 4 × 10
Must be in the range of ^{-10 to} 5 × 10 ^-6 S / m,
Further, the conductivity σ is 5 × 10 ^{−10 to} 2.5 × 10
It is preferably in the range of ^-6 S / m. The conductivity is a value measured at the same temperature as the driving temperature (operating environment) at which the electro-sensitive working medium is used.

The electro-sensitive working medium comprising an organic compound having a halogen atom, particularly a fluorine atom, has a relatively low surface tension among organic liquid compounds. As a result of the experiment, the generation of bubbles during the driving showed that the surface tension of the medium was 22 dyn /
It was found that the amount was smaller for liquid organic compounds of cm or less, and it was stable even when a high voltage was applied.

Examples of the halogen-containing liquid organic compound, particularly the fluorine-containing liquid organic compound, which forms the electro-sensitive working medium having such characteristics include: (1) ethyl perfluorobutyl ether (C ₄ F ₉ -OC
₂ H ₅₎ [Conductivity ^{= 1.0 × 10 -9 S / m} , the surface tension = 14 dyn / cm] (2 ) ethyl perfluoro isobutyl ether (iso-C ₄ F ₉
-OC ₂ H ₅ ) [Conductivity = 1.0 × 10 ^-9 S / m, Surface tension = 14 dyn / cm] (3) Methyl perfluorobutyl ether (C ₄ F ₉ -O-CH ₃ ) [Conductivity = 1.1 × 10 ^-9 S / m, surface tension = 14 dyn / cm] (4) Methyl perfluoroisobutyl ether (C ₄ F ₉ -OC
₂ H ₅ ) [Conductivity = 1.1 × 10 ⁻⁹ S / m, Surface tension = 14 dyn / cm] (5) C ₉ F ₁₈ (CF ₃ -CF = CF ₂ trimer; Mixture) (CF ₃ ) ₂ CFCF = C (CF ₃ ) CF (CF ₃ ) ₂ … 52 wt% (CF ₃ ) ₂ CFCF ₂ -C (CF ₃ ) = C (CF ₃ ) ₂ … 48 wt% [Conductivity Rate = 3.5 × 10 ^-9 S / m, surface tension = 16 dyn / cm] (6) C ₆ F ₁₂ (CF ₃ -CF = a dimer of CF ₂ and a mixture of the following compounds) (CF ₃ ) ₂ CFCF = CFCF ₃ … 93% by weight (CF ₃ ) ₂ C = CFCF ₂ CF ₃ … 7% by weight [conductivity = 6.0 × 10 ⁻¹⁰ S / m, surface tension = 13 dyn / cm] (7) Benzotrifluoro Ride _{(CF 3 -C 6 H 6)} [ conductivity ^{= 5.0 × 10 -8 S / m} , the surface tension = 21 dyn / cm] (8 ) p- chloro benzotrifluoride _{(p-Cl-C 6 H} 4 - C
F ₃ ) [Electrical conductivity = 2.0 × 10 ⁻⁸ S / m, surface tension = 19 dyn / cm] (9) Fluorine-based heat medium; trade name: Galden HT-200,
[Electric conductivity = 5.2 × 10 ⁻¹⁰ S / m, surface tension = 12 dyn / cm] (10) A mixture of ethyl perfluorobutyl ether (50% by weight) and a fluorine-based inert liquid (50% by weight) (25%) ℃) [Conductivity = 7.8 × 10 ^-10 S / m, Surface tension = 14 dyn / cm, (25 ℃)] Ethyl perfluorobutyl ether (C ₄ F ₉ -OC ₂ H ₅ ) [Conductivity = 1.0 × 10 ^-9 S / m, surface tension = 14 dyn / cm, (25 ° C)] Fluorinated inert liquid (Product name: Fluorinert FC-43, Sumitomo 3
M Conductor) [Conductivity = 7.0 × 10 ^-13 S / m, Surface tension = 12 dyn / cm, (25 ℃)] (11) Fluorinated inert liquid (trade name: Fluorinert FC-43, Sumitomo (3M Co., Ltd.) (80 ° C) (Conductivity = 4.2 × 10 ^-10 S / m, Surface tension = 10.5 dyn / cm, (80
° C)] (12) C ₉ F ₁₇ -OC ₆ H ₅ [conductivity = 5 × 10 ⁻⁹ S / m, surface tension = 17 dyn / cm, (80 ° C.)]. These halogen-containing organic compounds, particularly fluorine-containing organic compounds, are all liquid at least at the use temperature.

In the present invention, a liquid halogen-containing organic compound having conductivity and surface tension within a specific range, particularly a fluorine-containing organic compound, can be used alone as an electrosensitive working medium. It is also possible to use a mixture of a liquid fluorine-containing organic compound in which two or more kinds of organic compounds, particularly fluorine-containing compounds are mixed, and the conductivity and surface tension of the obtained mixture are adjusted to the above specific ranges. In addition, these fluorine-containing compounds often show good compatibility with each other, and even when the above-mentioned plural fluorine-containing compounds are mixed, a uniform mixture is obtained.

Further, the above fluorine-containing compound is
For example, when the flash point is measured by a general flash point measurement method as specified in JIS-3362, the flash point is not indicated. Therefore, such halogen-containing organic compounds, especially fluorine-containing organic compounds, are at least flame-retardant, and most compounds or mixtures are non-flammable and do not burn. In addition, such halogen-containing organic compounds,
In particular, the fluorine-containing organic compound or mixture is chemically very stable, and hardly decomposes even when the environment is rapidly changed such as a spark.

Further, in order to apply a voltage to such an electro-sensitive operating medium and efficiently form a moving flow of the medium, the electro-sensitive operating medium preferably has a low viscosity. The viscosity at the working temperature of the working medium is 1 × 10 ⁰ Pa · s or less, and the viscosity η is 1
× is preferably in the range of ^{10 -4 Pa · s~1 × 10 0} Pa · s, the electro-sensitive movable medium which is within the range of ^{2 × 10 -4 Pa · s~8 ×} 10 -1 Pa · s Particularly preferred.

In the present invention, it is essentially preferable to use the above-mentioned fluorinated organic compound as the electro-sensitive working medium, but this fluorinated organic compound contains other components. Or a mixture with an electro-sensitive working medium containing no halogen atom, especially no fluorine atom. Here, examples of components that can be blended in the electro-sensitive working medium include components that do not impair the properties and uniformity of the electro-sensitive working medium, such as a viscosity modifier, a coloring material, a stabilizer, and a compatibilizer. it can.

In the micromotor of the present invention, the above-described electro-sensitive working medium or a homogeneous electro-sensitive working medium is used.

First, an SE type ECF motor using the above-described electro-sensitive working medium will be described.

FIG. 2A is a diagram schematically showing a cross section of the SE type ECF motor of the present invention, and FIG.
It is XX sectional drawing in (A), FIG.3 (D) is Y-
FIG. 3 (C) is a perspective view schematically showing a rotating body.

The SE-type ECF motor of the present invention has a bottomed medium storage portion 44 for storing the electro-sensitive operating medium, and a lid 41 for sealing the upper open portion of the medium storage portion 44. By fitting the lid 41 into the opening at the upper part of the medium accommodating section 44, the housing 40 sealed by the lid 41 and the medium accommodating section 44 is formed.

The medium accommodating portion 44 forming the housing 40 has a bottomed shape and is usually made of a synthetic resin (eg, polyolefin such as polyethylene and polypropylene, Teflon ^™ , polycarbonate) which does not erode the filled electro-sensitive working medium. , Acrylic resin, and other engineering plastics), ceramics, wood, metal, glass, and the like. Further, the medium housing portion 44 can be formed of a conductive material such as a metal such as stainless steel. However, if the insulating property between the electrodes is impaired, an insulating process is performed or an insulating material is used. Preferably, it is formed.

The lid 41 is provided so as to close the open portion above the medium storage portion 44. This upper lid 41
An upper bearing portion 46 for rotatably fixing the upper portion of the rotating shaft 45 is formed at the center of the shaft.

Further, a lower bearing 48 is formed on the bottom 49 of the housing 40 to lock the lower end of the rotating shaft.

The rotating body 30 is arranged in the housing 40. The rotating body 30 is rotated by the rotating shaft 45 to the housing 4.
It is arranged to rotate with respect to zero. Rotating body 30
Is the electro-sensitive working medium 21 filled in the housing 40
Is rotated by the moving flow generated in

In the present invention, the rotating body 30 is made of a synthetic resin (eg, polyolefin such as polyethylene and polypropylene, which does not erode the filled electro-sensitive working medium).
Teflon ^TM, polycarbonate, acrylic resin, other engineering plastics, etc.), ceramics, wood, metal, and is formed of glass or the like.

In the SE type ECF motor, the electrode 50
Is provided on one or both of the lower surface of the lid 41 constituting the housing 40 and the inner bottom surface of the medium housing portion 44. Further, the electrode may be formed on the inner peripheral surface of the side wall of the medium accommodating portion.

That is, FIGS. 2A, 2B and 3
(D) shows an SE-type ECF motor in which the electrodes 50 are stretched on both the lower surface of the lid 41 and the inner surface of the bottom of the medium accommodating section 44. It may be stretched, or the lower surface of the lid 41 or the medium storage portion 4
The electrode 50 may be provided on any one of the inner surfaces of the bottom of the electrode 4.

By arranging the electrodes so as to form a non-uniform electric field in the electro-sensitive working medium 21, a moving flow of the electro-sensitive working medium 21 is formed. FIG. 2 (B), FIG. 3 (D)
, Four anode electrodes 50a are arranged radially at an angle of 90 degrees from the center of the housing 40, and four anode electrodes 50a are formed at an angle of 22.5 degrees with respect to the anode electrodes 50a. In which the cathode electrode 50b is disposed.

Such an electrode 50 may be formed by stretching a conducting wire. However, the SE type ECF motor of the present invention is very thin (for example, the thickness of the entire housing is 2 mm or less). Therefore, it is preferable to form the electrode 50 by using, for example, a plating technique employed when manufacturing a printed wiring board. By utilizing the plating technique as described above, the thickness of the electrode 50 is reduced to 100 μm.
Hereinafter, it can be preferably in the range of 0.1 to 50 μm.

The electrodes 50 may be arranged so as to form a non-uniform electric field in the electro-sensitive working medium 21. The number of the electrodes 50 is not particularly limited. Up to 48, preferably 2 to 36 are stretched. In addition, the electrode 50 is electrically connected to one end of the conductor 42 so that a voltage can be applied from the outside, and the other end of the conductor 42 is led out of the housing 40.

When the electrodes 50 are provided on both the lower surface of the lid 41 and the inner surface of the bottom of the medium container 44,
Since the rotating body 30 is provided between the upper and lower electrodes, the moving flow of the electro-sensitive working medium 21 is hardly generated between the upper and lower electrodes,
A moving flow of the electro-sensitive working medium 21 is formed between adjacent electrodes. That is, FIGS. 2A, 2B, 3C,
As shown in (D), the electro-sensitive working medium 21 is moved in the direction of the arrow.
Is formed.

In the SE type ECF motor of the present invention, the rotating body 30 is rotated by the moving flow of the electro-sensitive working medium thus formed, and the electric energy applied to the electrode is taken out as rotational energy.

The rotating body 30 is a disk mounted on a rotating shaft 45, and a flow receiving member 31 for rotating the disk by the moving flow of the electro-sensitive working medium is provided on the surface thereof. The flow receiving member 31 is not particularly limited in its shape and number as long as it can receive the moving flow of the electro-sensitive working medium.
(B) and FIG. 3 (C) show an aspect in which six ridges having a right-angled triangular cross section are formed radially on the front and back surfaces of the disk, respectively. Usually, 2 to 30, preferably 3 to 20 such flow receiving members 31 are formed on the surface of the rotating body 30 on the side of the housing 10 on which the electrodes 50 are laid. The ridges having a right-angled triangular cross section as described above are laid so that the right-angled side of the right-angled triangle with respect to the moving flow of the electro-sensitive working medium 21 stands upright with respect to the rotating body. The flow receiving member 31 can be provided so as to protrude from the disk constituting the rotating body 30 as described above, or can be formed in a concave shape when the disk has an appropriate thickness. Further, since the flow receiving member 31 has only to rotate the rotating body 30 together with the moving flow as a resistance to the moving flow of the electro-sensitive working medium 21, the flow receiving member 31 is linear as in the above-described convex and concave lines. This is not always necessary, and may be simple protrusions or depressions, or may be formed by processing the surface of the disk so as to reduce the surface roughness of the disk.

FIG. 2A, FIG. 2B, FIG.
(D) shows an embodiment in which the rotating body 30 is flat, but the rotating body 30 can have various shapes such as an inverted triangle, a rhombus, and a circle.

The rotating body 30 is pivotally attached to a rotating shaft 45 at the center, and the rotating shaft 45 is rotatably fixed to the housing 40. The material forming the rotating body 30, the rotating shaft 45, and the optional flow receiving member 31 is a synthetic resin (eg, polyolefin such as polyethylene and polypropylene, Teflon ^™ , polycarbonate, acrylic) which does not corrode the electro-sensitive working medium. Resin, other engineering plastics, etc.), ceramics, wood, metal, glass, etc.

The rotating body 30 only needs to be able to rotate within the housing 40 without contacting the inner peripheral surface of the side wall.
The ratio of the diameter of the rotating body 30 to the diameter of the rotating body 30 can be set as appropriate. However, the electro-sensitive working medium between the outer peripheral portion of the rotating body 30 and the inner It is not considered to act directly, and
0, the ratio of the inner peripheral diameter of the medium housing portion 44 to the diameter of the rotating body is preferably in the range of 100: 99 to 100: 50, and particularly in the range of 100: 95 to 100: 75. Is preferred. 1 (A) and 1 (B), the diameter of the rotating body 30 is drawn smaller for the sake of explanation.
Are almost similar to each other so as to almost contact the inner peripheral wall surface of the medium accommodating portion 41.

In addition to the case where the flow receiving member 31 is formed, the thickness of the rotating body 30 is usually 0.05
5 mm, preferably about 0.1 to 2 mm, and the depth (from the upper surface of the bottom to the lower surface of the lid) of the housing 40 accommodating the electro-sensitive working medium 21 is usually 0.5 to 10 mm, preferably 1 to 10 mm.
It is about 2 mm, and the diameter of the housing / the thickness of the housing is 1.01 or more. Further, the ratio of the thickness of the housing to the diameter of the housing is generally 1: 1.01 to 1: 500, preferably 1: 2 to 1: 500.
1:50.

The diameter of the housing 40 is usually 3 to 5
0 mm, preferably about 5 to 25 mm.
Type ECF motors can be very thin. Further, since the SE-type ECF motor of the present invention is very thin, the amount of the electro-sensitive working medium filled and sealed therein is about 10 to 0.05 ml, which is very small.

As described above, in the SE type ECF motor of the present invention, the thickness of the housing 40 is usually 50 mm or less, preferably 2 mm or less.
0 mm or less, particularly preferably 2 mm or less,
In such a thin SE-ECF motor, the height to the tip of the rotating shaft can be reduced to about 10 mm. Although the SE type ECF motor of the present invention is very thin as described above, the output power density represented by the torque / volume of the medium accommodating portion is usually 1 × 10 ² W / m ³ or more. In this case, the drive is performed with higher efficiency by using a microstructure.

Next, the RE type ECF motor will be described.

FIG. 4A is a sectional view of the RE-type ECF motor, and FIG. 4B is a perspective view showing a state of electrodes laid on the rotating body. FIG. 5 shows another embodiment of the electrode laid on the rotating body. This RE type EC
In the description of the F motor, members common to those of the SE type ECF motor are given the same reference numerals.

The RE-type ECF motor of the present invention has the same basic components as those of the above-mentioned SE-type ECF motor. However, in this RE type ECF motor, the electrode laying position is
Unlike the SE-type ECF motor, electrodes are laid on the rotating body, and when a voltage is applied, the rotating body forms a moving flow of the electro-sensitive working medium and self-propelled by the reaction.

In this RE-type ECF motor, a medium housing portion 44 for housing the electro-sensitive operating medium 21 and a lid 41
A casing 40 is formed from the above, and a rotating body 30 is provided inside the casing 40, and the rotating body 30 is mounted on a rotating shaft 45. Further, this rotation axis is
It is rotatably fixed to the shaft.

However, in this RE type ECF motor, the electrodes are not formed on the housing 40,
It is formed on the surface of the rotating body 30 as shown in FIG.

That is, in this RE type ECF motor, the rotating shaft 45 and the rotating body 30 are integrated, and
In the rotating shaft 45, an upper rotating shaft above the rotating body 30 is covered with a conductive film 45a made of a conductive metal. The conductive coating 4 covering the upper rotating shaft
5a is continuous up to the joint with the rotating body 30, and the conductive coating 45a is formed on the upper surface 30 of the rotating body 30.
a is radially and linearly extended in the direction of the edge 33 of the rotating body 30 to form an electrode 50 a on the upper surface 30 a of the rotating body 30. The electrode 50a that has reached the edge 33 of the rotating body 30 falls down the edge 33, reaches the lower surface 30b (back side) of the rotating body 30, and then extends along the outer peripheral direction. The electrode 50 is bent in the front and extended linearly in the axial direction, and the electrode 50 is provided on the lower surface (back surface) 30b.
a.

On the other hand, the entire surface of the lower rotating shaft below the rotating body 30 is covered with the conductive film 45b.
The conductive coating 45b covering the lower rotating shaft is continuous up to the joint with the rotating body 30, and the lower surface 30b of the rotating body extends radially and linearly in the direction of the edge 33 of the rotating body 30. The electrode 50b is formed on the lower surface 30b of the rotating body 30. The electrode 50b that has reached the edge 33 of the rotating body 30 rises up the edge 33, reaches the upper surface 30a of the rotating body 30, extends along the outer peripheral direction, and is centered on the upper surface 30a of the rotating body 30. The electrode 50b is bent in front of the linear electrode 50a formed in the circumferential direction and is extended in the axial direction to form the electrode 50b on the upper surface 30a of the rotating body.

The electrode 50a is an anode, the electrode 50b is a cathode, and both are electrically insulated.

FIG. 4B shows an embodiment in which the anode electrode 50a and the cathode electrode 50b extend radially from the center of the rotating body. In this RE type ECF motor,
By arranging the electrodes so as to form a non-uniform electric field in the electro-sensitive working medium, a moving flow of the electro-sensitive working medium is formed. Therefore, the arrangement and shape of the electrodes are non-uniform in the electro-sensitive working medium. What is necessary is just to be able to form a uniform electric field. For example, the anode electrode 50a and the cathode electrode 50
b may be arranged such that the pair of anode electrodes 50a and cathode electrodes 50b are substantially parallel as shown in FIG. In this case, when an electrode that generates a moving flow from one electrode to the other electrode, and in FIG. 5, a moving flow in the direction from the anode electrode 50a to the cathode electrode 50b is used as the electro-sensitive working medium, the inside of the RE-type ECF motor of the present invention is used. The electro-sensitive working medium generates a circulating moving flow along the front surface or the back surface of the rotating body 30, and the rotating body 30 is driven to rotate in a reaction direction of the generated moving flow.

In the housing 40 of the RE-type ECF motor of the present invention, the upper bearing portion 46 and the lower bearing portion 48 for fixing the rotating shaft 45 have a conductive film 45a formed on the surface of the rotating shaft 45 and a conductive film 45a. The portion in contact with the conductive film 45b is formed of a conductive member, and the conductive member is connected to the conductors 42, 42, and is formed so that a voltage can be externally applied.

The electrodes 50a and 50b and the conductive films 45a and 45b as described above can be formed using various electric conductive materials. However, the RE type ECF motor of the present invention is very thin and small. For this reason, it is preferable to form using a plating technique adopted when forming a printed circuit board or the like. Therefore, the electrodes 50a, 50b and the conductive coatings 45a, 45b are very thin electroconductive coatings, and usually have a thickness of 0.01 to 30 m, preferably 0.1 to 15 m. The upper bearing portion 46 and the lower bearing portion 48 can also be formed by sticking a conductive metal, but can also be formed by using a plating technique in the same manner as described above. In addition, the bearing 46,
48 and the conductive film 4 formed on the surface of the rotating shaft 45
Reference numerals 5a and 45b denote voltage supply contacts and the rotating body 3
It is a sliding part at the time of zero rotation, and it is preferable to incorporate a friction reduction mechanism such as a bearing mechanism in this part to reduce a decrease in rotation speed due to friction between the two. Also, when using a plating technique to form these, at the time of plating, along with a conductive material containing gold, silver, copper, nickel, etc.
By adding graphite, molybdenum disulfide particles, Teflon ^TM particles, boron nitride (BN) solid components, fine diamond particles, especially solid lubrication components,
The coefficient of friction between the two can be reduced. If the conductive substance has a solid lubrication action, or
When the solid lubricating component has conductivity, conductivity and lubricity can be obtained only by plating one component.

In FIGS. 4A and 4B, the rotating body 30 is formed in a flat plate shape. The shape of the rotating body is, for example, as shown in FIG. The shape may be a shape, the shape may be a rhombus in a longitudinal section as shown in FIG. 6B, and the shape may be a circle in a longitudinal section.

The rotating body 30 only needs to be able to rotate within the housing 40 without contacting the inner peripheral surface of the side wall.
The ratio of the diameter of the rotating body 30 to the diameter of the rotating body 30 can be appropriately set, but the electro-sensitive working medium 21 between the outer peripheral portion of the rotating body 30 and the inner circumferential wall of the housing 40 causes the rotating motion of the rotating body 30 to rotate. Is considered not to act directly. Therefore, it is preferable that the ratio of the inner peripheral diameter of the medium accommodating portion 44 constituting the housing 40 to the diameter of the rotating body is in the range of 100: 99 to 100: 50. In particular, it is preferably in the range of 100: 95 to 100: 75. Further, as shown in FIG. 9, two or more rotating bodies 30 can be installed in one medium accommodating section 44 to manufacture a micromotor having a large number of rotating shafts. Further, as shown in FIG. 10, a plurality of rotating bodies can be formed on the rotating shaft. In this case,
The electrode can be formed on the inner wall surface of the housing, can be formed on the front and / or back surface of each rotating body, or can be formed on both. FIG. 4 (A)
Although, for the sake of explanation, the diameter of the rotator 30 is drawn smaller, the more efficient RE-type ECF motor is designed so that the rotator 30 almost comes into contact with the inner peripheral wall surface of the medium housing portion 44. The diameters are similar.

The thickness of the rotator 30 is usually set at 0.1.
The depth of the housing 40 in which the electro-sensitive operating medium 21 is stored (from the bottom upper surface to the lid lower surface) is usually 0.05 to 5 mm. .0m
m, preferably about 0.1 to 1.0 mm.

In the RE-type ECF motor of the present invention, the ratio between the height of the rotating body and the diameter of the rotating body can be appropriately set, but is usually 1: 1.01 to 1: 500, preferably 1: 2. １ ： 1: 50.

The RE-type ECF motor of the present invention can be made very thin.

In the RE-type ECF motor of the present invention, the thickness of the housing 40 can be usually set to 20 mm or less, preferably 2 mm or less, and the height to the tip of the rotating shaft is set to 1 mm.
It can be as small as 0 mm. Although the RE-type ECF motor of the present invention is very thin as described above, the output power density represented by the torque / volume of the medium accommodating portion is usually 1 × 10 ² W / m ³ or more. In this case, the drive is performed with higher efficiency by using a microstructure.

Further, the thin micromotor of the present invention is a combination of the two in addition to the SE type ECF motor in which the electrodes are arranged on the housing 40 and the RE type ECF motor in which the electrodes are arranged on the rotating body 30 as described above. It can also be in the form. That is, as shown in FIGS. 7A, 7B, 8C, 8D, and 8E, the anode electrode 50 is provided on the lower surface of the lid 41 of the housing 40.
c and the negative electrode 50d, and the anode electrode 50e and the negative electrode 50f
Place. In the electrode 50 arranged in this way, since formation of the moving flow of the electro-sensitive working medium is prioritized between the electrodes having a short distance between the adjacent anode and the negative electrode, for example, four anodes form an angle of 90 degrees. And 22.
Stretching the cathode at an angle of 5 degrees creates a moving flow of the electro-sensitive working medium 21 that normally travels from the anode to the cathode. At the same time, in the RE type ECF motor,
A conductive film 45a is formed on the outer periphery of the upper part of the rotating shaft 45 above the upper surface 30a of the rotating body 30, and a film 45b is formed below the lower surface of the rotating body 30. Similarly to the type ECF motor, an anode electrode 50g and a cathode electrode 50h are formed on the surface of the rotating body 30 in the direction from the rotating shaft 45 to the edge 33. Since the anode electrode 50g and the adjacent cathode electrode 50h are provided at an angle of 22.5 degrees, a moving flow of the working medium 21 between the anode electrode 50g and the cathode electrode 50h during electricity is formed. The rotating body 30 is formed to have various thicknesses so that the edge electrode 50j that joins the upper surface 30a and the lower surface 30b of the rotating body 30 crosses the edge in an inclined manner. Therefore, the moving flow of the electro-sensitive working medium 21 is also formed by the edge electrode 50j. Also, in this micromotor, the electrodes 50m and 50n are formed adjacent to each other also on the inner peripheral surface of the side wall of the housing 40.
The moving flow of the electro-sensitive working medium 21 is also formed by the electrodes 50m and 50n. Then, by making the electrodes as described above have such a polarity that the moving flow of the electro-sensitive working medium is in one direction, the moving flow of the electro-sensitive working medium formed by the respective electrodes cooperates, Since the rotator 30 moves at a higher speed, the rotator 30 may be rotated at a higher speed.

Further, in the micromotor of the present invention, as shown in FIG. 9, a plurality of rotating bodies 30 can be arranged in the medium accommodating section 44. FIG. 9 shows an R in which three rotating bodies 30 are rotatably mounted on a rotating shaft 45 in a housing.
An example of an E-type ECF motor is shown. Further, FIG.
As shown in (1), a plurality of rotating bodies can be formed on the rotating shaft. In this case, in the RE type ECF motor, the electrodes are formed on the front surface and / or the back surface of each rotating body. In addition, electrodes are formed on the front and back surfaces of the rotating body, electrodes are arranged on the inner wall surface of the housing, and the rotating body is rotated by the reaction of the moving flow of the electro-sensitive working medium to be formed. The moving flow of the electro-sensitive working medium formed by the formed electrodes can be received by the rotating body, and the two can be shared.

The thin micromotor of the present invention is provided with a rotation contact resistance reducing means for reducing the rotation resistance of the rotating shaft. Here, examples of the rotating contact resistance reducing means include an oil-impregnated bearing mechanism and a hydrostatic bearing mechanism. The rotating contact resistance reducing means is provided at at least one contact portion selected from the group consisting of a rotating shaft, a shaft hole, and a bearing portion, and further provided on all of the contact portions in the thin micromotor of the present invention. It is preferable that the rotation contact resistance means is provided. Specific examples of such rotary contact resistance reducing means include a needle bearing mechanism, a roller bearing mechanism, a ball bearing mechanism, a sleeve bearing mechanism, an oil-impregnated bearing mechanism, a hydrostatic bearing mechanism, a fluid bearing mechanism, a magnetic coupling mechanism, and the like. And the rotational resistance reducing means is used in at least one drive contact portion of the thin micromotor. Also, by attaching a metal foil such as a gold foil to a portion where the rotating shaft contacts the housing, the rotating resistance is reduced.

The SE-type ECF motor or the RE-type ECF motor, which is a thin micromotor of the present invention as described above, or a composite micromotor of both types, has a medium accommodating portion filled with an electro-sensitive working medium, and a voltage of 100 V is usually applied between electrodes. ~ 1
It is driven by applying a DC voltage of 0 KV, preferably 100 to 6 KV. The current flowing at this time is usually 0.1 to 50 μA, preferably 0.5 to 10 μA, and the power consumption is very small. In the thin micromotor of the present invention, since the flowing current is very small, there is almost no heat generation from this micromotor. In addition, the thin micromotor of the present invention is a mechanism using a moving flow generated by an electro-sensitive working medium under an electric field, and is not a driving mechanism using a magnetic force / magnetic field. Also, it does not generate any magnetic, driving noise or electromagnetic noise.

In the thin micromotor of the present invention, the thickness of the housing is usually usually 50 mm or less, preferably 40 mm or less.
Particularly preferably, it is 20 mm, which is very thin. Further, by appropriately selecting the method of forming the electrodes, the material of the rotating body, and the like, the thickness of the housing can be reduced to 5 mm or less, preferably 2 mm or less. As described above, the thin micromotor of the present invention can be driven stably for a long time at a rotation speed of several hundreds to tens of thousands of revolutions per minute, despite being extremely thin.

[0107]

The thin micromotor of the present invention is very thin and small. In the thin micromotor of the present invention, the contact frictional resistance in such a driving unit is extremely reduced because the rotational contact resistance reducing means is disposed at the contact portion between the rotating shaft and the housing. The motor is driven at a rotational speed of at least hundreds to tens of thousands of revolutions per minute. Further, even when the motor is rotated at such a high speed, the thin micromotor of the present invention hardly generates heat.

The thin micromotor of the present invention uses a moving flow generated by an electro-sensitive working medium under an electric field, and is not a driving mechanism using a magnetic force / magnetic field. And does not generate any magnetic, driving noise or electromagnetic noise.

[0109]

The present invention will be described in more detail with reference to the following examples of the present invention, but the present invention is not limited to these examples.

[0110]

Example 1 A rotating body having a diameter of 19 mm and a thickness of 1.0 mm was manufactured by cutting an engineering plastic which is an electric non-conductor. At the center of the rotating body, a rotating shaft having a diameter of 1.0 mm is formed integrally with the rotating body.

Electrodes were laid on the integrated body of the rotating body and the rotating shaft by electroless nickel plating as shown in FIG. The thickness of the electrode thus formed is 5 μm.

On the other hand, a gold foil is stuck to the energizing contact portions (46 and 48 in FIG. 4) of the housing for accommodating the rotating body to reduce the friction between the rotating shaft and the energizing contact portion, and to nickel-plate. The contact electric resistance value with the film is reduced.

A ball bearing is used for the upper bearing to reduce the rotational contact resistance of the rotating shaft.

The integrated body of the rotating body having the electrodes formed as described above and the rotating shaft is incorporated into a casing having an inner diameter of 22 mm and a depth of 4 mm shown in FIG. Was filled with 1 ml of dibutyl decanedioate (DBD).

By applying a DC voltage of 6.0 KV between the electrodes of the RE-type ECF motor manufactured as described above, the rotating body of the RE-type ECF motor can rotate at 564 rpm.
(9.4 rps). When the gold foil is not attached and the ball bearing is not provided, the rotation speed of the RE-type ECF motor at an applied voltage of 6.0 KV is 320 rpm (5.3 rp).
s).

FIG. 11 shows the number of rotations of the RE-ECF motor and the value of the flowing current when the voltage is varied.

Further, eight types of small and lightweight propellers were prepared for the torque of the RE type ECF motor. The diameter of each propeller is 30mm, 40mm, 50mm, 60m
m, 70 mm, 80 mm, 90 mm, and 100 mm. The relationship between the rotation speed of these propellers and the torque required for rotation was measured in advance, and these propellers were mounted on a RE-type ECF motor, and the rotation speeds were measured to convert the corresponding torque.

FIG. 12 shows the results.

[0119]

Example 2 In Example 1, C ₉ F ₁₇ —O—C ₆ H ₅ (5 × 10
^-9 S / m, surface tension 17 dyn / cm, 1.1 × 10 ^-2 Pa · s)
A RE type ECF motor was manufactured in the same manner except that
The number of rotations and the current flowing when a voltage was applied to the RE-type ECF motor were measured.

FIG. 13 shows the results.

[Brief description of the drawings]

FIG. 1 is a graph showing the relationship between the conductivity and the viscosity of an electro-sensitive working medium preferably used in the present invention.

FIG. 2A is a longitudinal sectional view of an SE-type ECF motor of the present invention, and FIG.
It is X sectional drawing.

FIG. 3C is a perspective view of a rotating body, and FIG.
FIG. 2D is a sectional view taken along line YY in FIG.

FIG. 4A is a longitudinal sectional view of an RE-type ECF motor of the present invention, and FIG. 4B is a perspective view of a rotating body.

FIG. 5 is a diagram illustrating an example of an arrangement of electrodes in a RE-type ECF motor.

FIG. 6A and FIG. 6B are cross-sectional views showing examples of other forms of the rotating body.

FIG. 7 shows the SE type ECF motor and the RE type EC.
It is a figure showing the example of the micro motor which combined F motor.

FIG. 8 shows the SE type ECF motor and the RE type EC.
It is a figure showing the example of the micro motor which combined F motor.

FIG. 9 is a diagram illustrating an example of a cross section of a micromotor having a plurality of rotating bodies.

FIG. 10 is a diagram illustrating an example of an RE-type ECF motor in which a plurality of rotating bodies are arranged on one rotating shaft.

FIG. 11 shows an RE-type ECF used in Example 1.
4 is a graph showing a relationship between a voltage applied to a motor, a rotation speed, and a current.

FIG. 12 shows an RE-type ECF used in Example 1.
4 is a graph showing torque of a motor.

FIG. 13 shows an RE-type ECF used in Example 2.
4 is a graph showing a relationship between a voltage applied to a motor, a rotation speed, and a current.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 30 ... Rotating body 31 ... Flow receiving member 33 ... Edge part 40 ... Housing 41 ... Lid 44 ... Medium accommodation part 45 ... Rotating shaft 45 ... Upper bearing 48: Lower bearing 50: Electrode

Claims (12)

[Claims] 1. A housing comprising a bottomed medium storage portion for storing an electro-sensitive operating medium and a lid for sealing an upper release portion of the medium storage portion, and a housing provided at a central portion of the lid. A rotating shaft supported by the shaft hole and a bearing at the center of the bottom of the medium container, a rotating body fixed to the rotating shaft and rotating with the rotating shaft, and forming a moving flow of the electro-sensitive working medium by applying a voltage; A micromotor having electrodes and
The diameter of the rotating body is formed larger than the maximum thickness of the rotating body, the diameter of the housing / the thickness of the housing is 1.01 or more, and the rotating resistance of the rotating shaft is reduced. Wherein the rotating contact resistance reducing means is provided at at least one contact portion selected from the group consisting of a rotating shaft, a shaft hole, and a bearing portion. 2. The method according to claim 1, wherein the electrode is in contact with the electro-sensitive operating medium at a site selected from the group consisting of an upper surface of a bottom of the medium housing, a bottom of the lid, and an inner peripheral surface of a side wall of the medium housing. 2. The thin micro motor according to claim 1, wherein the micro motor is extended. 3. The thin micromotor according to claim 1, wherein the electrode is extended on an upper surface and / or a lower surface of the rotating body. 4. The thin micromotor according to claim 1, wherein a plurality of rotating bodies are formed on the rotating shaft. 5. The thin micro-electrode according to claim 1, wherein the electrodes are arranged so as to form a non-uniform electric field in the electro-sensitive working medium. motor. 6. The thin micromotor according to claim 5, wherein said electrodes are at least a pair of parallel electrodes having different polarities. 7. The rotating contact reducing means is selected from the group consisting of a needle bearing mechanism, a roller bearing mechanism, a ball bearing mechanism, a sleeve bearing mechanism, an oil bearing mechanism, a hydrostatic bearing mechanism, a fluid bearing mechanism, and a magnetic coupling mechanism. 2. A rotary contact reducing means including at least one mechanism according to claim 1, wherein said rotary resistance reducing means is used in at least one drive contact portion of said thin micromotor. Thin micromotor. 8. The thin micromotor according to claim 1, wherein a ratio of a thickness of the housing to a diameter of the housing is in a range of 1: 1.01 to 1: 500. . 9. The thin micromotor according to claim 8, wherein the thickness of the housing is 50 mm or less. 10. The torque /
The output power density represented by the volume of the medium storage unit is 1 × 10
Thin micromotor as in claim 1, wherein said is at ² W / m ³ or more. 11. The electro-sensitive working medium has a horizontal axis having a conductivity σ.
In the graph showing the relationship between the conductivity σ and the viscosity η of the fluid at the operating temperature, the conductivity σ = 4 × 10 ⁻¹⁰ S / m and the viscosity η = 1 × 10 ⁰ Pa・ Point P represented by s, conductivity σ = 4 × 10 ⁻¹⁰ S / m, viscosity η = 1 × 10
Inside a right triangle having a point R represented by a point Q represented by ⁻⁴ Pa · s, conductivity σ = 5 × 10 ⁻⁶ S / m, viscosity η = 1 × 10 ⁻⁴ Pa · s as a vertex Or a mixture of two or more compounds prepared so as to have a conductivity σ and a viscosity η located inside the triangle. Item 2. The thin micromotor according to Item 1. 12. The electro-sensitive working medium is a homogeneous electro-sensitive working medium containing at least one liquid organic compound having at least three halogen atoms in a molecule,
The electrical conductivity of the homogeneous electro-sensitive working medium is within a range of 4 × 10 ^{−10 to} 5 × 10 ⁻⁶ S / m at an operating environment temperature, and the homogeneous electro-sensitive working medium is at an operating environment temperature. The thin micromotor according to claim 10, wherein the surface tension is 22 dyn / cm or less.