JP3225016B2 - Linear motor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable driving with completely new mechanism, miniaturization, and more efficient driving, by installing at least a pair of electrodes forming a moving flow of electrosensitive working medium by applying a voltage. SOLUTION: In the nearly central part of a driving shaft 118, a moving member 125 is axially fixed to the driving shaft 118. An electrode 121 is made as an anode, and an electrode 122 is made as a cathode. Decanedioic acid dibutyl is used as electrosensitive working medium 123. Between an inner cylinder 114 and a lid body 116a, a gap in which the medium 123 can flow is formed. The medium 123 which is formed between an outer cylinder 112 and the inner cylinder 114 and flows in the left direction inverts the direction by the lid body 116a, and forms a moving flow from the left toward the right direction inside the inner cylinder 114, which flow moves a moving member 125 toward the right direction. When the electrode 121 is made as a cathode and the electrode 122 is made as an anode, a moving flow from the right toward the left direction is formed, and moves the moving member 125 toward the left direction. By repeating the above process, a linear motor is linearly driven.

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 small linear motor 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.

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

The present inventor has found a new electro-sensitive effect that a specific fluid moves by applying a voltage to a specific liquid, and the specific liquid (electro-sensitive working medium) and the electro-sensitive working medium (Japanese Patent Application Nos. 816871, 8-16872, 8-76259, and 8).
248417, Japanese Patent Application No. 8-241679, etc.). The output power density of the micromotors described in these specifications is increased by miniaturization.

[0005] However, the motor disclosed in the above specification is of a type that rotates a rotor, and does not disclose a linear motor that is driven in a linear manner.

[0006]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a very small linear motor in which an electro-sensitive working medium is caused to flow by applying a DC voltage, and is driven linearly by the flow of the electro-sensitive working medium. I have.

[0007]

SUMMARY OF THE INVENTION A linear motor according to the present invention comprises an electro-sensitive operating medium, a medium accommodating portion for sealingly accommodating the electro-sensitive operating medium, a drive shaft extending from the medium accommodating portion, and a drive shaft. A moving member which is fixed and moves linearly in the medium accommodating portion together with the drive shaft by the moving flow of the electro-sensitive working medium, and at least one pair of electrodes forming a moving flow of the electro-sensitive working medium by applying a voltage; It is characterized by having.

[0008] The linear motor of the present invention has a SE-ECF linear motor (Stator-electr
ode type electro-conjugate fluid linear motor) and P
E-type ECF linear motor (Piston-electrode type elect
ro-conjugate fluid linearmotor) and their CE
Type ECF linear motor (Complex-electrode type electr
o-conjugate fluid linear motor).

In the SE-type ECF linear motor, the medium accommodating portion includes an outer cylinder and an inner cylinder, and a non-uniform electric sensitive working medium is provided between the outer cylinder and the inner cylinder. An electrode for forming an electric field is formed, and a voltage is applied to the coiled electrode to introduce a moving flow of the electro-sensitive working medium formed between the outer cylinder and the inner cylinder into the inner cylinder. It is driven by moving a moving member of the inner cylinder into the inner cylinder.

[0010] In the PE-type ECF linear motor, the moving member includes at least a pair of porous members through which the electro-sensitive working medium can flow, and the pair of porous members are electrically insulated and fixed to the drive shaft. And applying a voltage to the porous member to form a moving flow by forming a non-uniform electric field in the electro-sensitive working medium, and reacting the porous member by a reaction of the moving flow of the electro-sensitive working medium. This is a linear motor that is driven by moving inside the medium accommodating section together with the drive shaft.

The CE type ECF linear motor is an SE type EC
This is a type in which an F linear motor and a PE-type ECF linear motor are combined. For example, the medium storage portion includes an outer cylindrical body and an inner cylindrical body, and a non-uniform electric sensitive working medium is provided in the inner cylindrical body. At least one pair of electrodes capable of forming an electric field and capable of reversing the polarity of the electrodes are arranged, and between the inner cylinder and the outer cylinder, an electro-sensitive working medium generated by applying a voltage to the electrodes is provided. It has a moving member that moves with the movement, and the moving member is a linear motor that is integrated with a drive shaft that is derived from the medium storage unit.

Generally, it is not considered that even if a DC voltage is applied to an insulating fluid, the applied voltage acts on the insulating fluid to cause fluid movement or the like. However, the present inventor has confirmed that when a DC voltage is applied to a part of a group of fluids known as insulating media or certain organic compounds, the fluid flows. If the kinetic energy of the flowing fluid can be extracted in this manner, the electric energy can be used as the kinetic energy without using any mechanical element.

In the linear motor of the present invention, when a DC voltage is applied, the flow energy of the electro-sensitive working medium is extracted as linear kinetic energy of a moving member such as a piston.

[0014]

Next, the linear motor of the present invention will be described in detail. The linear motor according to the present invention includes an electro-sensitive operating medium, a medium housing portion for hermetically housing the electro-sensitive operating medium, a drive shaft extending from the medium housing portion, and a drive shaft fixed to the drive shaft. A moving member that linearly moves in the medium accommodating section together with the drive shaft in response to the moving flow of at least one of the electrodes, and at least one pair of electrodes that form a moving flow of the electro-sensitive working medium by applying voltage.

The electro-sensitive working medium used in the present invention is a liquid capable of forming a moving flow between the electrodes according to the 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 the organic compound is substantially insulating.

Such a compound is usually a compound having at least one ester bond in the molecule. Examples of compounds having the above-mentioned properties used as the electro-sensitive working medium in the present invention 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

[0018]

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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)

[0020]

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(18) Methyl acetyl ricinoleate (MA
RN)

[0022]

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

[0024]

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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)

[0026]

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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)

[0028]

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

[0030]

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(28) Dioctyl tetrahydrophthalate (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)

[0032]

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(35) Linalyl acetate

[0034]

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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 = 2-Ethylhexyl palmitate (38) DAM: Trade name; Exepal BS = 1: 4 mixture DAM = Diallyl maleate Exeparal BS = Butyl stearate (39) Dodecane diacid Dibutyl (Bu-OCO- (CH ₂ ) ₅ -CH (Bu)-
COO-Bu) (DBDD) (40) Dibutyl docosantioate [Bu-OCO- (CH ₂ ) ₆ -CH (CH ₃ )
_{- (CH 2) 4 -CH (} CH 3) - (CH 2) 6 -COO-Bu].

The above compounds can be used alone or in combination. For example, the conductivity and viscosity of such a compound at 25 ° C. are measured and the values are as shown in Table 1 below.

[0037]

[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.

[0041]

[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 used in 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 × 1
0 ^-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) Methyl acetyl ricinoleate (MAR-N)
(Σ = 1.30 × 10 ⁻⁸ S / m, η = 1.3 × 10 ⁻² Pa · s), (20) dibutyl itaconate (DBI) (σ = 1.4
6 × 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 = 6.2)
4 × 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 stearate (trade name:
Sansocizer E-4030) (σ = 5.46 × 10 ^-9 S / m,
η = 2.0 × 10 ⁻² Pa · s), (28) Dioctyl tetrahydrophthalate (trade name: Sansocizer DOTP) (σ = 6.20 × 10 ⁻¹⁰ S)
/ m, η = 4.0 × 10 ⁻² Pa · s), (33) 1-ethoxy-2-acetoxypropane (σ = 4.0.
41 × 10 ⁻⁷ S / m, η = 4.0 × 10 ⁻⁴ Pa · s), (35) linalyl acetate (σ = 1.82 × 10 ⁻⁹ S / m,
η = 1.3 × 10 ⁻³ Pa · s) (36) Dibutyl decandioate (σ = 1.40 × 10 ⁻⁹ S / m,
η = 7.0 × 10 ⁻³ Pa · s) (39) Dibutyl dodecandioate (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)
m, η = 2.5 × 10 ⁻² Pa · s) Furthermore, when a plurality of media are used in combination as the electro-sensitive working medium used in the present invention, the conductivity of the mixture obtained as a result of the combination is used. If the viscosity is within the triangle defined by points P, Q and R in FIG. 1, it can be preferably used.

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). It can be suitably used as a sensitive working medium.

Further, the electro-sensitive working medium only needs to have the above-mentioned conductivity and viscosity at the temperature used in the present invention, and even if it is a compound which is not located inside the above-mentioned triangle at 25 ° C. At this use 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.

The above-described electro-sensitive working medium is used in the linear motor of the present invention. Among the linear motors of the present invention having such a configuration, the SE type ECF linear motor will be described first.

FIG. 2 is a diagram schematically showing a cross section of the SE-type ECF linear motor of the present invention, and FIG. 3 is a diagram schematically showing an example of a coiled electrode used in the SE-type ECF linear motor. It is.

In the SE-type ECF linear motor of the present invention, the electrodes are arranged so that a non-uniform electric field is formed in the above-described electro-sensitive working medium to form a moving flow of the electro-sensitive working medium. The moving flow is received by a moving member (piston) and taken out as a linear motion.

In the SE-type ECF linear motor, the medium accommodating section 110 has an outer cylinder 112 and an inner cylinder 114 provided inside the outer cylinder 112. This outer cylinder 1
The lids 116a and 116b are fitted into both ends of the twelve. Further, a through hole 120 through which the drive shaft 118 passes is formed at the center of the lids 116a and 116b. Both ends of the inner cylinder 112 and the lids 116a, 116
A gap is formed between b and the inner peripheral surface so that the electro-sensitive working medium 123 can flow.

Then, between the outer cylinder 112 and the inner cylinder 114, there are coiled electrodes 121, 122 as shown in FIG.
Is loaded. The coiled electrodes 121 and 122 are wound around the inner cylinder 114 so as to surround the inner cylinder 114, and the electrodes 121 and 122 are electrically insulated. The coil-shaped electrode 121 and the coil-shaped electrode 122 are arranged so that a non-uniform electric field can be formed in the electro-sensitive working medium 123. In order to form a non-uniform electric field in the electro-sensitive working medium 123, the coiled electrodes 121 and 122 are not arranged evenly with each other, and FIG.
As shown in (1), it is advantageous that the distance between the electrode 121 and the electrode 122 is reduced to form a pair and the distance between the adjacent electrode 121 and the electrode 122 is increased. FIG. 3 shows an example in which a non-uniform electric field is formed in the electro-sensitive working medium 123 by setting the interval between the paired electrodes to 2 mm and the interval between the unpaired electrodes to 4 mm. One end of the electrode arranged as described above is led out of the medium accommodating section 110 so that a voltage can be applied from the outside.

At substantially the center of the drive shaft 118, a moving member (piston) 125 is mounted on the drive shaft 118.
The moving member 125 is formed so as to receive the moving flow of the electro-sensitive operating medium 123 and to be able to move right and left in the inner cylinder 114 together with the drive shaft 118.

When the electrode 121 is used as an anode, the electrode 122 is used as a negative electrode, and dibutyl decanoate is used as the electro-sensitive working medium 123, the outer cylinder 112 and the inner cylinder 1
14, the electro-sensitive working medium 123 forms a moving flow in the direction of the arrow (left direction). Since a gap through which the electro-sensitive working medium 123 can flow is formed between the inner cylinder 114 and the lid 116a, a leftward direction formed between the outer cylinder 112 and the inner cylinder 114 is formed. The direction of the flowing electro-sensitive operating medium 123 is reversed by the lid 116 a to form a moving flow from the left to the right inside the inner cylinder 114, thereby moving the moving member 125 to the right.

Next, contrary to the above, when the electrode 121 is a negative electrode and the electrode 122 is an anode, the electro-sensitive working medium 123 between the inner cylinder 114 and the outer cylinder 112 moves from left to right. Of the inner cylinder 114 and the outer cylinder 11
2, the flow direction is reversed by the lid 116b to form a moving flow from the right to the left in the cylinder of the inner cylinder 114, and the moving member 125 is moved to the left.

By repeating the above operation,
The SE type ECF linear motor of the present invention drives linearly. In the SE type ECF linear motor as described above,
As shown in FIG. 4, the coiled electrode and the moving body may be reversed.

That is, in the SE-ECF linear motor shown in FIG. 4, the medium accommodating portion 110 is formed by the outer cylinder 112, the inner cylinder 114, and the lids 116a and 116b. Is formed on the inner peripheral wall surface of the inner cylinder 114. A ring-shaped moving member 125a is disposed between the inner cylinder 114 and the outer cylinder 112, and the ring-shaped moving member 125a is moved by auxiliary driving shafts 118a and 118a branched from the driving shaft 118. Supported.

In FIG. 4, the SE type E shown in FIG.
Members common to the CF linear motor are given the same numbers. The above-mentioned SE type ECF linear motor is filled with an electro-sensitive working medium 123 such as dibutyl decane diate, and the coil-shaped electrode 121 shown in FIG.
When a DC voltage is applied using the electrode 122 as a negative electrode, a jet jet of the electro-sensitive working medium 123 is formed in the inner cylinder 114 from right to left, and the jet jet is formed by the lid 116.
When it collides with the inner peripheral wall of a and changes its direction from left to right, it flows between the outer cylinder 112 and the inner cylinder 114 to move the ring-shaped moving member 125a to the right. The movement of the ring-shaped moving member 125a is
The drive shaft 118 is transmitted to the drive shaft 118 by 8a and 118a, and the drive shaft 118 moves rightward.

Similarly, if the electrodes of the coiled electrodes 121 and 122 are reversed, a jet jet of the electro-sensitive working medium 123 in the opposite direction is formed, and the ring-shaped moving body 125a moves to the left. , The drive shaft 118 moves to the left.

Further, the linear motor of the present invention uses a pair of moving members as electrodes without using a coil-shaped electrode as described above, and forms a jet jet of an electro-sensitive working medium between the two members. A PE-type ECF linear motor driven by the reaction of the jet jet may be used.

FIG. 5 schematically shows an example of a PE-type ECF linear motor. As shown in FIG. 5, the PE-type ECF linear motor has a cylindrical body 132
And the lid 1 which is fitted and closed at both ends of the cylindrical body 132
36a, 136a, and the lids 136a, 136a
A through-hole 120 is provided at the center of the shaft to rotatably drive the drive shaft 138 left and right. The drive shaft 138 penetrates the through hole 120, and the drive shaft 1
A pair of moving members 141 and 142 through which the electro-sensitive working medium 123 can flow are fixedly mounted near the center of the shaft 38. FIG. 5 shows an embodiment in which the pair of moving members (electrodes) 141 and 142 through which the electro-sensitive working medium 123 can flow are formed of a metal net. Further, between the pair of moving members 141 and 142, an electrically insulating member 143 is provided.
The moving member 141 and the moving member 142 are electrically insulated.

When a non-uniform voltage is applied to dibutyl decanoate used as the electro-sensitive working medium 123, a jet jet is formed from the anode to the negative electrode. In FIG. 5, an external electrode (not shown) is connected to the drive shaft 138,
When the moving member 141 is an anode and the moving member 142 is a negative electrode, a jet jet of the electro-sensitive working medium 123 is formed from the moving member 141 toward the moving member 142.
In the PE-type ECF linear motor shown in FIG. 5, the moving members 141 and 142
23 are formed to be able to circulate, the moving members 141 and 142 move in the opposite direction to the jet jet due to the reaction of the jet jet generated by the voltage application. In FIG. 5, when the moving member 141 is an anode and the moving member 142 is a negative electrode, the moving members 141 and 142 move to the left. Then, the moving members 141 and 142
Is mounted on the drive shaft 138, the drive shaft 138 is driven leftward by the above-described movement of the moving members 141 and 142 caused by applying a voltage.

In the PE type ECF linear motor as described above, the moving member 14 which is an electrode and a driving source is used.
1, 142 is not particularly limited as long as the electro-sensitive operating medium 123 flows and can be moved by the reaction of the jet flow of the electro-sensitive operating medium 123.
As shown in FIG. 7, a mesh type formed by a metal net or the like can be used, and various forms such as a nozzle shape and an annular shape can be adopted. For example, in the case of forming a mesh, it is usually preferable to use a metal net having an aperture of 0.05 to 5.0 mm, preferably about 0.3 to 2.0.

Further, the linear motor of the present invention comprises an SE type ECF linear motor shown in FIG. 2 and a PE type motor shown in FIG.
It may be a composite type with a type ECF linear motor. In the present invention, such a composite linear motor is referred to as “CE type ECF”.
It is referred to as "linear motor".

FIG. 6 shows an example of a CE type ECF linear motor. As shown in FIG. 6, the CE-type ECF linear motor of the present invention has a medium accommodating portion 110 like the SE-type ECF linear motor shown in FIG. It comprises a body 112, an inner cylinder 114 provided inside the outer cylinder 112, and lids 116 a and 116 b for closing both ends of the outer cylinder 112. The drive shaft 11 is provided at the center of the lids 116a and 116b.
A through-hole 120 through which 8 penetrates is formed. Inner cylinder 1
A gap is formed between both end portions of the inner cover 12 and inner peripheral surfaces of the lids 116a and 116b so that the electro-sensitive working medium 123 can flow.

The non-uniform electric field is formed between the outer cylinder 112 and the inner cylinder 114 so as to form a non-uniform electric field in the electro-sensitive working medium 123 between the outer cylinder 112 and the inner cylinder 114. The coiled electrodes 121 and 122 as shown in FIG. 3 are loaded, and the coiled electrodes 121 and 122 form a moving flow of the electro-sensitive working medium 123 between the outer cylinder 112 and the inner cylinder 114. Is done. In FIG. 6, the electrode 1
Reference numeral 21 denotes an anode, electrode 122 denotes a cathode, and an electro-sensitive working medium 123 such as dibutyl decane diate comprises an outer cylinder 112.
A moving flow flows from right to left between the inner cylinder 114 and the inner cylinder 114. The moving flow of the electro-sensitive working medium 123 flowing from right to left between the outer cylinder 112 and the inner cylinder 114 is turned by the lid 116a, and
Inside, the moving flow flows from left to right.

On the other hand, a pair of moving members (electrodes) 141 and 142 are fixedly mounted near the center of the drive shaft 138 formed at the center of the lids 116a and 116b. In FIG. 6, the moving member 141 and the moving member 142 form a pair of electrodes through which the electro-sensitive working medium 123 can flow, and the moving members 141 and 142 are shown as being formed of a metal net. I have. An electrically insulating member 143 is interposed between the pair of moving members 141 and 142, and the moving member 141 and the moving member 142 are electrically insulated.

The moving member 142 serves as an anode, and the moving member 1
When a DC voltage is applied to the drive shaft 138 so that 41 becomes a cathode, the electro-sensitive working medium 123 in the inner cylinder 114 is
Of the moving member 1 by this reaction.
41 and 142 move rightward. And the outer cylinder 11
The moving members 141 and 142 are moved rightward in cooperation with the moving flow of the electro-sensitive working medium 123 generated between the inner cylinder 2 and the inner cylinder 114 and flowing into the inside of the inner cylinder.

When the voltage applied to the electrodes is reversed, the moving members 141 and 142 move from right to left. The linear motor of the present invention is driven by forming a non-uniform electric field in the electro-sensitive working medium 123 as described above. The voltage applied between the electrodes to drive this linear motor is usually 50 V to 15 KV, preferably 100 V to 10 KV, and the current flowing at this time is usually 100 μA or less, preferably about 10 μA or less. . As described above, in the linear motor of the present invention, although the applied voltage is high, the flowing current is extremely weak, and heat generated by driving the linear motor is hardly observed.

The linear motor of the present invention is suitable for miniaturization, and its size is not particularly limited. However, the diameter is usually not more than 60 mm, preferably not more than 30 mm, and the length is usually not more than 300 mm, preferably not more than 300 mm. Is less than 100 mm, and from the research on the rotary motor using the electro-sensitive working medium, it is possible to drive with higher efficiency by reducing the size.

The material for forming the linear motor of the present invention is not particularly limited, but the medium accommodating portion, the moving body, etc. are made of synthetic resin (eg, Teflon, polycarbonate, acrylic, etc.) which is not eroded by the electro-sensitive working medium, It can be formed of wood, metal, glass, or the like. When such members are formed of metal and these members require insulation, the surfaces may be subjected to insulation treatment. Further, the electrodes can be formed of a conductive metal wire or the like. Furthermore, this electrode can be formed by plating or the like using a printed circuit board wiring technique.

The linear motor of the present invention can reciprocate by switching the applied voltage, and when an external force is applied to the moving member (piston), the piston moves so as to oppose the external force. By applying the voltage as described above, the linear motor can be used as a shock absorber for reducing external force.

In particular, since the linear motor of the present invention is driven by applying a DC voltage so that a non-uniform electric field is formed in the electro-sensitive working medium, it is difficult to drive the conventional linear motor. It operates even in a strong magnetic field environment.

The linear motor of the present invention can be variously modified. For example, as shown in FIG. 8, the medium accommodating section 110 is formed so as to form a loop, electrodes 121 and 122 are provided on a part of the loop-shaped medium accommodating section 110, and a voltage is applied to the electrodes 121 and 122. When the voltage is applied, a circulating flow of the electro-sensitive working medium 123 is formed, and the circulating flow is received by the moving member 125, whereby the moving member 125 is raised. The moving member 125 has a drive shaft 118 on one surface.
May be provided, and the drive shaft 118 may be driven up and down as the moving member 125 moves.

[0075]

The linear motor of the present invention is driven by a completely new mechanism that applies a DC voltage so as to form a non-uniform electric field in a specific electro-sensitive working medium. Moreover,
By downsizing, it drives more efficiently and generates little heat.

Further, since the linear motor of the present invention does not use a magnetic force, it can be driven normally even in a strong magnetic field.

[0077]

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.

[0078]

EXAMPLE 1 An SE-type ECF niria motor having the structure shown in FIG. 2 was manufactured. This SE type ECF linear motor has an outer cylindrical body having an inner diameter of 25 mm and a length of 38 mm, and an outer diameter of 16 mm and a length of 35 mm.
mm inner cylinder, between which a pair of coiled electrodes are wound four times to form a non-uniform electric field in the electro-sensitive working medium. That is, this pair of coiled electrodes has a distance between one adjacent electrode of two.
mm and the distance between the other electrodes is 4 mm, and the electrodes are arranged so as to form a non-uniform electric field. On the other hand, a piston having a diameter of 9.7 mm was mounted on an inner cylindrical body having an inner diameter of 12 mm, and about 13 ml of linalyl acetate was filled in the medium accommodating section thus formed.

SE-type ECF formed as described above
When a DC voltage of 9.0 KV was applied to the pair of coiled electrodes of the linear motor, the piston started to move. The moving speed at that time was measured using a laser displacement sensor meter. FIG. 7 shows the results.

As a result, the piston started accelerating immediately after the application of the voltage, reached a moving speed of 0.065 m / s after about 40 ms, and was in an equilibrium state thereafter. The current value at this time is 2.0
μA. The direction of movement of the piston at this time was linked to the direction in which the used linalyl acetate generated a jet jet from the positive electrode to the negative electrode between the coiled electrodes.

This laser displacement sensor is an LB series manufactured by Keyence Corporation, and the sensor head is an LB-series.
02 and LB-06 was used as the amplifier. The measurement was performed with the measurement range set to ± 10 mm.

In this SE type ECF linear motor,
If the polarity of the electrode is reversed, the piston moves in the opposite direction.

[0083]

Example 2 An SE-type ECF linear motor was driven in the same manner as in Example 1, except that dibutyl decane diate was used instead of linalyl acetate.

As a result, the piston started accelerating immediately after the application of the voltage, reached a moving speed of 0.47 m / s after about 50 ms, and was in an equilibrium state thereafter. The current value at this time is 2.2
μA. The direction of movement of the piston at this time was linked to the direction in which the used dibutyl decane diacid generated a jet jet from the positive electrode to the negative electrode between the coiled electrodes.

[0085]

Example 3 An SE-type ECF linear motor was driven in the same manner as in Example 1, except that dibutyl dodecanediate was used instead of linalyl acetate.

As a result, the piston started accelerating immediately after the application of the voltage, reached a moving speed of 0.45 m / s about 50 ms later, and was in an equilibrium state thereafter. The current value at this time is 2.1
μA. The direction of movement of the piston at this time was linked to the direction in which the used dibutyl dodecane diacid generated a jet jet from the positive electrode to the negative electrode between the coiled electrodes.

[0087]

Example 4 A drive shaft having two disk-shaped electrode plates having a diameter of 10 mm was arranged in a cylinder having an inner diameter of 12 mm and a length of 35 mm. The two mesh type electrode plates are electrically insulated and face each other, the interval between them is 2.5 mm, and the mesh interval between the respective electrodes is 1 mm.

The cylindrical body was filled and filled with about 4 ml of linalyl acetate to manufacture a PE-type ECF linear motor.
A DC voltage of KV was applied. Disc mesh electrode plates are
Immediately after the voltage is applied, movement in the positive electrode application direction starts, and
After 0 ms, an equilibrium velocity of 0.38 m / s was reached. The current value at this time was 1.7 μA.

The jet jet of linalyl acetate was generated in the direction from the positive electrode to the negative electrode, and the disk mesh type electrode plate moved in the reaction direction of the jet jet.

[0090]

Example 5 A PE-type ECF linear motor was driven in the same manner as in Example 4 except that dibutyl decane diate was used instead of linalyl acetate.

As a result, the disk mesh type electrode started accelerating immediately after the application of the voltage, reached a moving speed of 0.25 m / s after about 40 ms, and was in an equilibrium state thereafter. The current value at this time was 2.0 μA. The jet jet of dibutyl decanedioate at this time is generated from the positive electrode to the negative electrode,
The disk mesh electrode plate moved in the reaction direction of the jet jet.

[0092]

Example 6 A PE-type ECF linear motor was driven in the same manner as in Example 4, except that dibutyl dodecanediate was used instead of linalyl acetate.

As a result, the disk mesh type electrode plate started accelerating immediately after the application of the voltage, reached a moving speed of 0.22 m / s about 40 ms later, and was in an equilibrium state thereafter. The current value at this time was 2.0 μA. At this time, the jet jet of dibutyl dodecanedioxide was generated in the direction from the positive electrode to the negative electrode, and the disk mesh type electrode plate moved in the reaction direction of the jet jet.

[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. 2 is a longitudinal sectional view showing an example of an SE type ECF linear motor of the present invention.

FIG. 3 is a diagram illustrating an example of a coiled electrode used in an SE-type ECF linear motor.

FIG. 4 is a cross-sectional view showing another example of an SE-type ECF linear motor.

FIG. 5 is a longitudinal sectional view showing an example of a PE-type ECF linear motor.

FIG. 6 is a longitudinal sectional view showing an example of a CE type ECF linear motor.

FIG. 7 is a graph showing an example of a change in driving speed of a SE type ECF linear motor with respect to a piston time.

FIG. 8 is a diagram showing another mode of the SE-type ECF linear motor.

[Explanation of symbols]

 110: Medium storage section 112: Outer cylinder 114: Inner cylinder 116: Lid 118: Drive shaft 121, 122: Electrode 123: Electro-sensitive working medium 125: ..Movement member 132 ・ ・ ・ Cylindrical body 141,142 ・ ・ ・ Movement member (electrode) 143 ・ ・ ・ Electrically insulating member

Continuation of the front page (72) Inventor Kazuya Edamura 2-9-1-306 Higashishinkoiwa, Katsushika-ku, Tokyo (56) References JP-A-9-208978 (JP, A) JP-A-9-208977 (JP) , A) JP-A-10-88174 (JP, A) Registered utility model 3041928 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) H02N 11/00 C10M 105/32 H02K 57 / 00

Claims (8)

(57) [Claims] 1. An electro-sensitive operating medium, a medium accommodating portion for hermetically containing the electro-sensitive operating medium, a drive shaft led out from the medium accommodating portion, and fixed to the drive shaft, the electric-sensitive operating device being A moving member that linearly moves in the medium accommodating portion together with the drive shaft by the moving flow of the medium, and at least one pair of electrodes that form a moving flow of the electro-sensitive working medium by applying a voltage. Linear motor. 2. An electrode for forming a non-uniform electric field in an electro-sensitive operating medium between an outer cylinder and an inner cylinder, wherein the medium accommodating portion includes an outer cylinder and an inner cylinder. Is formed, and a voltage is applied to the coiled electrode to introduce a moving flow of the electro-sensitive working medium formed between the outer cylinder and the inner cylinder into the inner cylinder, and The linear motor according to claim 1, wherein the moving member is moved. 3. The medium storage section comprises an outer cylinder and an inner cylinder, and at least one pair of electrodes capable of forming a non-uniform electric field on the electro-sensitive working medium is disposed in the inner cylinder. Yes,
Between the inner cylinder and the outer cylinder, there is a moving member that moves with the movement of the electro-sensitive working medium caused by applying a voltage to the electrode, and the moving member is moved from the medium accommodating portion. 2. The linear motor according to claim 1, wherein the linear motor is integrated with the derived drive shaft. 4. The moving member comprises at least a pair of porous members through which an electro-sensitive working medium can flow, and the pair of porous members are electrically insulated and fixed to a drive shaft. A voltage is applied to the porous member to form a non-uniform electric field in the electro-sensitive working medium to form a moving flow, and the porous member is moved together with the drive shaft by the reaction of the moving flow of the electro-sensitive working medium. The linear motor according to claim 1, wherein the linear motor is moved in the housing. 5. The linear motor according to claim 2, wherein said electrodes are a pair of coiled electrodes capable of forming a non-uniform electric field in the electro-sensitive working medium. 6. The method according to claim 1, wherein the porous member has a mesh size of 0.05 to 0.05.
5. A reticulated electrode of 5.0 mm.
Linear motor according to the item. 7. The linear motor according to claim 1, wherein a DC voltage of 50 V to 15 KV is applied between the pair of electrodes. 8. An electro-sensitive working medium, wherein the abscissa represents a conductivity σ.
The vertical axis is the viscosity η and the conductivity of the fluid at the operating temperature.
In a graph showing the relationship between the rate σ and the viscosity η, the conductivity σ
= 4 × 10^-TenS / m, viscosity η = 1 × 10⁰Point expressed in Pa · s
P, conductivity σ = 4 × 10^-TenS / m, viscosity η = 1 × 10^-FourPa ・ s
Q, conductivity σ = 5 × 10 ^-6S / m, viscosity η = 1
× 10^-FourOf a right triangle with the point R as the vertex
A compound having conductivity σ and viscosity η located inside,
Or the conductivity σ and viscosity located inside the triangle
Mixing of two or more compounds prepared to have η
5. The method according to claim 1, wherein
The linear motor according to any of the above items.