JP3033498B2 - Working medium and actuator for actuator - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an actuator for converting electric energy into kinetic energy such as rotational motion and reciprocating motion, and a working medium thereof.

[0002]

2. Description of the Related Art An actuator for directly converting electric energy into kinetic energy such as rotational motion and reciprocating motion by using a working medium has not been known. No. 175,872 (1994
(Filed on March 27) is the only one. The actuator of this prior application includes an electro-sensitive fluid as a working medium in a housing, a plurality of electrodes provided in the housing, and a movable member for taking out power is arranged in the housing, and a voltage is applied to the electrodes. The movable member is moved by a working medium, and a binary mixture of an organic fluorine compound and an electrically insulating fluid is used as the electro-sensitive fluid.

[0003]

SUMMARY OF THE INVENTION The inventor of the present invention has sought to further improve the performance of the actuator of the prior application.
Moreover, we studied to obtain a cheap one.

[0004]

As a result, dibutyl adipate or di-2-ethylhexyl alcohol is used as the working medium.
It turned out that the above-mentioned subject can be achieved by selecting a selate .

Hereinafter, the present invention will be described in detail. FIGS. 1 to 3 show an example of an actuator according to the present invention, which is a kind of motor for extracting rotational motion. In the figure, reference numeral 1 denotes a bottomed cylindrical case (housing) made of an electrically insulating material, and a lid 2 is attached to the case 1 so as to close an opening thereof. As shown in FIG. 3, eight electrodes 3a, 3b,
3c, 3d, 3e, 3f, 3g, 3h are attached.

The electrodes 3a, 3b,..., 3h are wire-like members made of metal such as iron, copper, aluminum, etc., and are inserted through electrode support portions 4 formed on the inner peripheral wall of the case 1 to protrude. It is attached so that it may contact the wall surface of. The upper portions of the electrodes 3a, 3b... 3h are bent in an L-shape, and the slits 5 formed in the upper portion of the case 1 are formed.
Extends outside the case 1 and its end is bent in an annular shape.

In the case 1, an impeller-shaped rotor 6 is provided.
Is provided. As shown in FIG. 2, the rotor 6 comprises a rotating shaft 6a and six blades 6b attached to the rotating shaft 6a at equal intervals. The lower end of the rotating shaft 6a has a needle head shape, The pivot shaft 6 a is supported by a pivot bearing 7 formed at the center of the bottom of the case 1, and the upper part of the rotating shaft 6 a is provided at the center of the lid 2 and extends above the case 1 via a shaft 8.

3h, lead wires (not shown) are connected to one DC power source 10 from the electrodes 3a, 3b... 3h. This DC power supply 10 is 0.5 to 10 kV
3h, and has an automatic switching function of sequentially and automatically switching and applying the output DC voltage to each of the electrodes 3a, 3b... 3h for a predetermined time as needed.

In the case 1, a jib is provided as the working medium 11 to such an extent that the blades 6b of the rotor 6 are substantially submerged.
Tyl adipate or di-2-ethylhexyl azele
Bets have been met.

Next, the operation of the actuator of this embodiment will be described. Basically, a plurality of electrodes 3a, 3b,.
The rotor 6 is rotated by applying a DC voltage from the DC power supply 10 to the motor. The specific voltage application method is as follows.

First, in the first voltage application method, two electrodes, for example, the electrode 3a in FIG. 3 and the electrode 3e located at a position of 180 degrees in a plane angle with respect to the electrode 3a are used as positive electrodes,
In this method, a DC voltage is applied with the electrodes grounded (negative electrode). This first voltage application method is characterized in that two fixed electrodes are used as positive electrodes, for example, and the remaining six electrodes are grounded and negative electrodes are used as voltages. In this case, a positive charge is applied from the positive DC power supply to the positive electrode, and the ground side is relatively negative. Further, when the DC power supply is a negative-type power supply for applying a negative charge, a negative charge is applied to the two fixed electrodes, so that the electrode becomes a negative electrode and the ground side becomes a relatively positive electrode.

As a modification of the first voltage application method,
A voltage is applied with the electrode 3a and the electrode 3d located at a position of 135 ° in a plane angle with respect to the positive electrode, and the remaining electrode is grounded. There is a type in which a voltage is applied using the electrode 3c as a positive electrode and the remaining electrode is grounded. Of course, a combination having the same plane angle as the combination of these electrodes, for example, the electrode 3
a and electrode 3f, electrode 3a and electrode 3g, electrode 3b and electrode 3
d and the like are also included in the first application method. However, in the arrangement of FIG. 3, a combination of electrodes that are adjacent electrodes is excluded.

Therefore, in the first voltage application method, at least two electrodes are used as a positive electrode or a negative electrode, at least one electrode is present between these two electrodes, and these electrodes are used as the remaining electrodes. In addition, it is desirable that the arrangement be grounded.

In the first voltage application method, it is preferable for the rotation of the rotor to make the electric field intensity between the two electrodes relatively high. For this purpose, the method of increasing the applied voltage and the case are miniaturized. And the like. Specifically, when the inner diameter of the case of FIG. 1 is 5 cm, the applied voltage is 3 kV.
More preferably, it is desirable to be 5 kV or more.

The second voltage application method is a method in which a DC voltage is sequentially switched and applied to the eight electrodes 3a, 3b... 3h in FIG. Specifically, eight electrodes 3
.. 3h, a voltage is applied with the two electrodes 3a and 3e opposed to each other across the rotation axis 6a of the rotor 6, and the remaining electrodes are grounded. After a certain period of time, for example, one second, the voltage application is switched from the electrode 3a to the adjacent electrode 3b and from the electrode 3e to the adjacent electrode 3f in the clockwise direction in FIG. At this time, from the electrode 3e to the electrode 3f
The timing of switching to the electrode 3a is delayed from the timing of switching from the electrode 3a to the electrode 3b by a fixed time, for example, 0.5 seconds. Therefore, an extra voltage is applied to the electrode 3e for a longer time than the electrode 3a, for example, 0.5 second.

Next, after a voltage is applied to the electrode 3b and the electrode 3f for a predetermined time, for example, one second, the electrode 3b
, The voltage application is switched from the electrode 3f to the electrode 3g, and the switching from the electrode 3f to the electrode 3g is also delayed because the previous switching timing is delayed. In this manner, as shown in the timing chart of FIG. 4, the voltage application to the two electrodes is not switched at the same time, but one of the two electrodes is delayed for a predetermined time, for example, 0.5 seconds. To switch. Hereinafter, a voltage is applied by sequentially switching to each electrode in the same manner. In any case, the electrodes other than the two electrodes to which the voltage is applied are grounded.

In the second voltage applying method, the rotor 6 rotates even if the electric field strength between the electrodes is relatively low, and the applied voltage may be 2 kV or less. This is a voltage application method suitable for a large size.

By applying a voltage to the plurality of electrodes 3a, 3b,..., The rotor 6 provided in the case 1 rotates. Thus, the rotational motion can be extracted from the rotating shaft 6a of the rotor 6, and the rotor 6 operates as an actuator.

In such an actuator, electric energy by applying a voltage to the plurality of electrodes 3a, 3b,... Is converted into a rotational motion of the rotor 6, and can be taken out as power.

In the above specific example, the number of electrodes is eight.
As described above, any other number may be used as long as the number is two or more, and the number of rotor blades may be two or more. Also, there is no particular need to match the number of electrodes with the number of rotor blades.
Furthermore, if another voltage application method is adopted, the rotation speed of the rotor can be changed. Also, without being limited to the rotating machine described above, a piston is arranged in a cylinder, a working medium is filled, and a plurality of annular electrodes are arranged on an inner peripheral wall of the cylinder, and a return flow path of the working medium is provided in the cylinder. , By sequentially switching and applying the voltage to the electrodes,
The piston can be reciprocated.

Experimental Example 1 The actuator shown in FIGS. 1 to 3 was manufactured. However, only the rotor 6 has eight blades provided with eight blades at equal intervals. About 15 ml of dibutyl acylate ("DBA", manufactured by Daihachi Chemical Industry Co., Ltd.) as a working medium
Was filled in Case 1. A DC voltage of 5.0 kV was applied using the electrodes 3a and 3e as positive electrodes, and all the remaining electrodes were grounded to form negative electrodes. As a result, the small rotor started to rotate immediately after the application of the voltage, and continued to rotate during the application of the voltage. The rotation speed was 92 rpm, and the current value at this time was 0.05 mA or less, which was lower than the lower limit of measurement of the current measuring device used.

(Experimental Example 2) In Experimental Example 1, di-butyl adipate was used instead of dibutyl adipate.
The operating state at the time of voltage application was observed in the same manner except that 2-ethylhexyl azelate ("DOZ", manufactured by Daihachi Chemical Industry Co., Ltd.) was used. As a result, the small rotor started to rotate immediately after the application of the voltage, and continued to rotate during the application of the voltage. The rotation speed was 31 rpm, and the current value at this time was 0.05 mA or less, which was lower than the lower limit of measurement of the current measuring device used.

[0023]

As described above, according to the present invention, as a working medium, dibutyl adipate and di-2-ethyl ether are used.
A novel actuator that converts electrical energy into rotational motion and reciprocating motion using xylazelate can be obtained.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram illustrating an example of an actuator of the present invention.

FIG. 2 is a plan view showing a rotor of the actuator of FIG. 1;

FIG. 3 is a plan view showing an arrangement of electrodes of the actuator of FIG. 1;

FIG. 4 is a timing chart illustrating an example of a second voltage application method to electrodes in the actuator of the present invention.

[Explanation of symbols]

1 ... case, 3a, 3b, 3c, 3d, 3e, 3f, 3
g, 3h ... electrodes, 6 ... rotor, 10 ... DC power supply, 11 ...
Working medium

────────────────────────────────────────────────── ─── Continued on the front page (51) Int.Cl. ⁷ Identification code FI H04N 11/00 H04N 11/00 Z 11/24 (72) Inventor Toshiharu Saito 5-3-1 Sakurada, Washinomiya-cho, Kita-Katsushika-gun, Saitama (56) References JP-A-8-226375 (JP, A) JP-A-6-287583 (JP, A) JP-A-8-284798 (JP, A) JP-A 8- 210240 (JP, A) (58) Field surveyed (Int. Cl. ⁷ , DB name) H02N 11/00

Claims (3)

(57) [Claims] A working medium is put in a housing, and the working medium is put in the housing.
Multiple electrodes are provided, and a movable member for power take-out is
And apply a voltage to the electrodes to
Kinetic energy
A working medium used for an actuator that converts energy
There are, dibutyl adipate or di-2-ethylhexyl azelate
Actuator actuation characterized by comprising a rate
Medium . 2. The operating medium according to claim 1 is placed in a housing, a plurality of electrodes are provided in the housing, and a movable member for taking out power is arranged in the housing, and a voltage is applied to the electrodes. Wherein the movable member is moved via the working medium. 3. The working medium according to claim 1 is placed in a cylindrical housing, and a plurality of electrodes are provided on an inner peripheral wall of the housing.
An actuator, wherein an impeller-shaped rotor is disposed in a housing, and a voltage is applied to the electrodes to rotate the rotor via a working medium.