JP3663708B2 - Electromagnetic drive device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an electromagnetic drive device, and is particularly suitable for a micro drive device used in a place where power supply is difficult, such as a micromachine, and can control the traveling direction and traveling speed by applying drive energy without wiring. The present invention relates to an electromagnetic drive device.
[0002]
[Prior art]
Research into micromachines is underway as the next generation technology. Micromachines are fine and precise machines used in the range of several millimeters to several micrometers, and are new technical fields expected to be used in the industrial and medical fields.
In the process of researching this micromachine, a very fine microcar having a vehicle body length of 4.8 mm, a width of 1.8 mm, and a height of 1.8 mm was prototyped. The microcar is composed of a 30 μm ultra-thin body with a nickel plating surface and gold plating, a chassis, and a motor with a coil diameter of 1.0 mm inside. This motor is driven by supplying a voltage of 3 V, 20 mA, 14 Hz from the outside with a wire.
[0003]
For this reason, the microcar always restricts the driving range, for example, the wire wire for power supply gets tangled during driving, or if the moving distance becomes long, the tension of the wire wire exceeds the driving force of a small motor, and so on. As a result, inconvenience occurs. Furthermore, in order for micromachine technology to be widely used in fields such as medical and industrial fields, it is often difficult to supply power by wiring when driving in a very small space such as in the body. Can be considered. In current technology,
It is very difficult to incorporate a battery inside a 4.8 mm × 1.8 mm × 1.8 mm or to supply power stably for a long time.
[0004]
In addition, the direction of the micro car cannot be controlled only by linear driving. When considering application to micromachines, it is very inconvenient when moving through complicated piping. For this reason, it is indispensable to produce an electromagnetic drive device that can provide a driving force without wiring and can control the direction.
Japanese Patent Laid-Open No. 61-76058 is disclosed as a prior art, but in this method, since the fixed yoke cannot be stably driven unless it is fixed to the linear movement guide, the range of use is considerably limited. Therefore, it cannot be applied to the micromachine field. For this reason, a new drive device is required.
[0005]
[Problems to be solved by the invention]
In the conventional power supply by wiring, the driving range is limited, and the tension of the wire wire exceeds the driving force of a small motor, resulting in inconveniences that hinder the progress. Moreover, it is difficult to manufacture a minute driving device with a structure having a battery inside.
[0006]
The present invention solves such a problem, and an object of the present invention is to provide an electromagnetic drive device that can be driven freely without supplying power by a conventional wire line or having a battery inside.
[0007]
[Means for solving the problems and actions / effects]
In order to achieve the above object, the present invention provides:
According to the configuration of claim 1, the drive device in which an alternating voltage is applied to the winding coil to generate an alternating magnetic field and is arranged at a distance from the winding coil, the mover with the permanent magnet attached is from the winding coil. By receiving the alternating magnetic field, it can be reciprocated and moved using its driving force, so that it can drive on the plane in the space where multiple winding coils are arranged without wiring, and in addition it is easy The effect is that miniaturization is possible with a simple structure.
[0008]
Further, according to the configuration of claim 1, the magnetic field is changed in accordance with the change in the positive and negative voltage ratio of the current applied to the winding coil, and the reciprocating motion of the right and left sides of the two movable elements arranged in parallel The change in force transmitted to the left and right drive units can be used for direction control and travel speed, and the direction and speed can be controlled on the plane in the space where multiple winding coils are arranged without wiring. The effect that it can drive is acquired.
[0009]
Moreover, in the structure of Claim 1 , although a drive device can be driven only in the space which has arrange | positioned several winding coils, in the structure of Claim 2 , one winding coil is moved. By doing so, it is possible to freely drive on the plane without wiring and freely controlling the direction and speed.
[0010]
According to these inventions, it is possible to develop an electromagnetic drive device that can be arbitrarily driven wirelessly in an area where energy supply is impossible in a minute space.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
1 to 4 relate to a first embodiment of the present invention, FIG. 1 is an overall side view of an electromagnetic drive device according to the first embodiment, and FIG. 2 is a top view of the drive device according to the first embodiment. FIG. 3 is a graph of a drive signal applied to the winding coil in the first embodiment, and FIG. 4 is an enlarged side view of the drive device drive unit in the first embodiment.
[0012]
In the first embodiment, the driving device 1 has a length of 4.8 mm, a width of 2.3 mm, and a height of 1.8 mm, as shown in FIGS. Except for the permanent magnet 2 and the body 8, the parts constituting the driving device 1 are parts obtained by machining stainless steel SUS310S, which is not easily affected by magnetic action, with a machining center, a wire electric discharge machine or the like. This is to increase the efficiency when driven by receiving electromagnetic force, and the drive is possible even if other materials are used. The body 8 is covered with a nickel plating having a composition that hardly receives a magnetic action of 20 μm and a gold plating of 1 μm. The configuration of the drive device 1 is fixed so that the N pole and S pole of the permanent magnet 2 of about 0.5 mm square are parallel to the moving element 3 as shown in the enlarged detail view of FIG. A central portion of the chassis 4 is rotatably supported by pins 100 so as to be able to reciprocate back and forth. A claw that is pivotally mounted about the pin 101a in front of the movable element 3 by moving the movable element 3 counterclockwise around the pin 100 and moving forward while tilting. 5a is pushed out and rotated so that one tooth of the ratchet 6a is pushed out by the force, and the driving device 1 is finely moved by turning the wheel 7a connected to the ratchet 6a. Further, when the moving element 3 moves backward while being inclined, the claw 5b and the ratchet 6b are pushed in the same manner as when the moving element 3 moves forward, and the driving device 1 is finely moved forward by turning the wheel 7b counterclockwise. The driving device 1 advances by repeating this movement continuously. In this mechanism, when the mover 3 moves forward (or rearward), the ratchet 6a (or ratchet 6b) pushes out and retracts by one of the teeth of the ratchet 6b (or ratchet 6a) to prepare for the next forward movement. The number of teeth to be moved to 16 is set in this case.
[0013]
The drive device 1 includes two sets of these drive units in parallel to the direction of travel of the drive device. At this time, the two sets of permanent magnets 2 are also placed in parallel, and fixed so that the opposing magnetic poles are opposite to each other so that the operation of the drive unit is alternated between the left and right.
The driving device 1 is placed on a material that easily allows a magnetic field to pass, for example, an acrylic resin base 30, and the winding coil 10 is disposed below the base 30. The winding coil 10 has a cylindrical shape having a diameter of 12 mm and a length of 27 mm, and a wire wire having a diameter of 0.1 mm is wound 700 times on the outer periphery thereof, and an AC voltage of 100 V, 0.3 A, 8 Hz by the control circuit 11. As a result, an alternating magnetic field is generated in the wound coil 10. Note that a plurality of intervals between the winding coils 10 are arranged in the traveling direction of the driving device 1 with a coil center distance of 30 mm, and the distance from the upper portion of the winding coil 10 to the permanent magnet 2 attached to the moving element 3 is also about 30 mm. .
[0014]
The permanent magnet 2 receives an electromagnetic force generated by an alternating magnetic field from the winding coil 10, thereby causing the moving element 3 to continuously reciprocate back and forth, and the drive device 1 goes straight. The traveling speed at this time is about 5 mm / second. Note that the traveling speed can be varied by changing the period of the AC voltage applied to the winding coil 10.
In addition, as shown in FIG. 3, by changing the positive and negative voltage ratio of one cycle, the magnetic field generated in the winding coil 10 is changed, and the right and left reciprocating motions of the two sets of moving elements 3 are changed. The change in force transmitted to the left and right drive units is used for direction control and travel speed. In this mechanism, the two sets of permanent magnets 2 are preferably not shifted from the center of the front / rear balance of the movable element 3 but fixed to either the front or rear. By changing the positive and negative voltage ratio of one cycle of current applied to the winding coil 10, one can be stopped and the direction can be changed by continuing to move the other.
[0015]
FIG. 5 is an overall side view of the electromagnetic drive device according to the second embodiment of the present invention. In the first embodiment, the drive device can be driven only within a range where a plurality of winding coils 10 are arranged, but in the second embodiment, one winding coil 10 is held by hand. Thus, when the winding coil 10 is moved at a speed corresponding to the driving speed, it can be continuously driven freely on the plane. Also at this time, the direction control and the traveling speed control can be performed by moving the winding coil 10 while changing the positive and negative voltage ratio of one cycle of the control circuit 11.
[0016]
According to the second embodiment of the present invention, it is possible to utilize a drive device that can be freely driven wirelessly in an area where energy supply is impossible in a minute space such as a micromachine.
FIG. 6 is a top view of the driving apparatus according to the third embodiment of the present invention. The third embodiment shown in FIG. 6 has a structure in which the drive unit of the drive device 1 described in the first embodiment and the second embodiment is set as one set, and it is necessary to change the traveling direction to the left and right. It is a drive device that can be driven wirelessly with a compact configuration, suitable for cases where only linear drive is required, and has a length of 4.8 mm, a width of 1.8 mm, and a height of 1.8 mm. Yes.
[Brief description of the drawings]
FIG. 1 is an overall side view of an electromagnetic drive device according to a first embodiment of the present invention.
FIG. 2 is a top view of the driving apparatus according to the first embodiment of the present invention.
FIG. 3 is a graph of a drive signal given to the wound coil in the first embodiment of the present invention.
FIG. 4 is an enlarged side view of a driving device driving unit according to the first embodiment of the present invention.
FIG. 5 is an overall side view of an electromagnetic drive device according to a second embodiment of the present invention.
FIG. 6 is a top view of a driving device according to a third embodiment of the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Drive device 2 Permanent magnet 3 Mover 4 Chassis 5 Claw 6 Ratchet 7 Wheel 8 Body 10 Winding coil 11 Control circuit 30 Base

Claims (2)

A mover having a permanent magnet, a drive unit having a drive unit that transmits the reciprocating motion of the mover as a drive force, and an electromagnetic drive unit having a winding coil, the distance from the winding coil being The drive device arranged at a distance is driven by reciprocating the movable element by receiving an alternating magnetic field from the winding coil by generating an alternating magnetic field by applying an alternating current to the winding coil ,
A drive device comprising two sets of the permanent magnet and the drive unit and arranged so as to oppose the direction of the magnetic pole of the permanent magnet is arranged at a distance from the winding coil, and a voltage applied to the winding coil is one cycle. An electromagnetic drive device , wherein the drive is performed while changing the magnetic field by changing the voltage ratio between plus and minus, and controlling the traveling direction and traveling speed of the driving device. The electromagnetic drive device according to claim 1 , wherein the winding coil is movable in a space separated from the drive device.

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