JP2013198391A - Thermomagnetic actuator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a thermomagnetic actuator on the basis of a novel principle using thermomagnetic properties of a magnetic body.SOLUTION: The thermomagnetic actuator is configured as follows. A magnetic field is formed by a magnet 2. A locus 5 of the magnetic body formed by continuously disposing magnetic body plates 1 having a predetermined size at appropriate spaced intervals is passed through the magnetic field. Using the magnet 2 as a mobile station and the locus 5 of the magnetic body as a stationary station, part of the magnetic field is held at a low temperature and magnetization of the magnetic body plates 1 is enhanced. The magnetization of the magnetic body plates 1 in the rest of the magnetic field is weakened by heating them with heating means 6. Thus, the magnetization of the locus 5 of the magnetic body in the magnetic field is disequilibrated to cause force by which the mobile station of the magnet 2 is drawn into the locus 5 of the magnetic body magnetized and held at the low temperature. The mobile station is moved by moving a heating location.

Description

  The present invention relates to a thermomagnetic actuator.

  Several methods have been devised to convert thermal energy into mechanical energy using the magnetic susceptibility displacement near the Curie temperature of the magnetic material, but the actuator has not been clarified.

JP-A-2-106183 (Magnetic Fluid Heat Engine) JP-A-6-141571 (Magnetic Heat Engine)

Naoshi Mijo, (ABC of Motor), Kodansha Publishing, P196-P199

  The present invention has been made for the purpose of solving a conventional problem and providing a thermomagnetic actuator based on a new principle utilizing the thermomagnetic characteristics of a magnetic material.

The present invention for solving the above problems is as follows.
A magnetic field is created by the magnet (2), and a magnetic material orbit (5) in which magnetic plates (1) of a predetermined size are connected with an appropriate gap is passed through the magnetic field, and the magnet (2) is used as a mobile station for magnetism. The body trajectory (5) is used as a fixed station, a part of the magnetic field is kept at a low temperature, the magnetization of the magnetic plate (1) is strengthened, and the magnetic plate (1) of the other magnetic field is heated (6). The magnet (2) is moved to the orbit (5) of the magnetic material that is kept at a low temperature by demagnetizing the magnetization by heating with the magnetic field and breaking the balance of the magnetization of the orbit (5) of the magnetic material in the magnetic field. It was possible to provide a thermomagnetic actuator characterized in that the station generates a pulling force and moves the mobile station by moving the heating point.

  The thermomagnetic actuator of the present invention is composed of a magnet and a magnetic orbit, and is extremely simple with the magnet as a mobile station and the magnetic orbit as a fixed station.

  According to the thermomagnetic actuator of the present invention, the magnetization of part of the orbit of the magnetic substance in the magnetic field is strengthened and the magnetization of the other part is heated to weaken the magnetization to balance the magnetization of the orbit of the magnetic substance in the magnetic field. It is a new actuator based on the principle that operates by breaking down and can be used in a wide range of fields in the future.

  Since the Curie temperature of the magnetic material can be selected in a wide temperature range from a low temperature to a high temperature, various heating sources can be used from the combustion heat of combustible gas to solar heat.

  The thermomagnetic actuator of the present invention can also be used in outer space.

FIG. 1 is a principle diagram 1 of the present invention. FIG. 2 is a principle diagram 2 of the present invention. FIG. 3 is a principle diagram 3 of the present invention. FIG. 4 is a principle diagram 4 of the present invention. It is a block diagram of the Example of this invention. It is a side view of the Example of this invention. It is sectional drawing of the Example of this invention. It is sectional drawing of the other Example of this invention. It is a block diagram of the other Example of this invention.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

  As shown in FIG. 1, when one magnetic plate (1) is placed in the vicinity of the end face of the magnet (2), the magnetic plate (1) is end face of the magnet (2) as shown in FIG. From the center of the magnet (2) and stops straight along the lines of magnetic force at the center of the magnet (2).

  This is because the magnetic plate (1) was pulled into the center of the magnet (2) by the tension of the magnetic lines of force, and the magnetic lines of force generated tension to try to be straight like a rubber string. This is consistent with the concept of magnetic field lines.

  As shown in FIG. 3, when the magnetic material track (5) in which the magnetic plates (1) are connected with an appropriate gap is placed on the end surface of the magnet (2), the magnet (2) becomes the magnetic material track (5). And stops at the position shown in FIG.

  In FIG. 4, it is easy to move the magnet (2) to the right side, but if it tries to move to the left side, a magnetic attractive force is generated and pulled back.

  The present invention has been made with a focus on the magnetic field generated by the magnet (2) and the magnetic force generated at the end face of the magnetic material trajectory (5). As shown in FIG. When the magnetic plate (1) in a specific region of the magnetic field is heated using 6) to weaken and demagnetize the magnetization, the demagnetized portion becomes the end face of the magnetic material orbit (5), and is maintained at a low temperature and magnetized. The magnetic (2) is pulled into the orbit (5) side of the magnetic body, and the magnet (2) moves away from the heating means (6) side and moves to the right side.

  When heating of the heating means (6) is continued and moved to the right side, the end surface of the magnetic orbit (5) moves to the right side, and at the same time the magnet (2) also moves to the right side and stops at a predetermined position when heating is stopped. .

  When the magnetic plate (1) on both end faces of the magnetic field is heated using two heating means (6) and demagnetized, the magnet (2) is attracted to the magnetic plate (1) inside the magnet (2) and stopped. However, it does not move to the left or right.

  After cooling the magnetic orbit (5), the heating means (6) is moved to the right position of the magnet (2) to continue heating, and when moving to the left, the magnet (2) continues to move to the left.

  Since the thermomagnetic actuator of the present invention is based on the heat cycle of heating and cooling of the magnetic material trajectory (5), the moving speed of the mobile station is much lower than that of the electric or pneumatic actuator. It is slow.

  The greatest feature of the present invention is that the magnetic body orbit (5) is not a continuous solid magnetic body having a predetermined width and thickness, but a magnetic body in which magnetic plates (1) having a predetermined size are connected with an appropriate gap. The orbit (5) makes it possible to quickly demagnetize the magnetic plate (1) only in the portion heated by the heating means (6), and to maintain the magnetization of the magnetic plate (1) magnetized at a low temperature. As a result of providing a quantitative temperature difference between the heated region and the non-heated region without weakening, it is possible to obtain a strong driving force due to the magnetic attractive force.

  In a continuous solid magnetic material having a predetermined width and thickness, heat is diffused also in the horizontal axis, so partial heating is impossible, and a quantitative temperature difference cannot be given between the heating region and the non-heating region. Even if the surface can be heated, it is difficult to heat it to the inside in a short time.

  FIG. 6 is a side view of an embodiment of the thermomagnetic actuator of the present invention, in which a magnetic material track (5) having a predetermined length by connecting magnetic plates (1) of a predetermined size with an appropriate gap. ) In a magnetic field, the magnet (2) is a mobile station, and the magnetic material trajectory (5) is fixed to the base (11) as a fixed station. In practice, the magnetic material trajectory (5) is Even if a magnetic plate with a predetermined width is bent at a predetermined length, or a solid magnetic body with a predetermined width and thickness is inserted with a groove having an appropriate depth and width at a predetermined interval, or a hole is made, Also, innumerable needle-like, rod-like, and granular magnetic pieces can be arranged with an appropriate gap, or a stitch or similar shape can be used.

  The magnetic material trajectory (5) may be any shape as long as it can be heated quickly by the heating means (6) and can reduce the diffusion of heat in the non-heated region, and is basically a continuous solid having a predetermined width and thickness. Any material other than a magnetic material can be used.

  In this embodiment, the rail (8) is attached to the upper side of the magnetic orbit (5), and the roller (9) is provided on the mobile station of the magnet (2) to enable the mobile station to move. FIG. 7 is a cross-sectional view of an embodiment, but in the implementation, the rail (8) can be separated from the magnetic track (5) and attached to the base (11).

  FIG. 8 shows another embodiment of the present invention in which a slide bearing (10)) is used in place of the roller (9). A simple moving mechanism.

  At present, various magnetic materials such as ferromagnets such as Fe, Ni, Co, etc., their compounds, metal temperature-sensitive magnetic materials, temperature-sensitive ferrites can be used as magnetic materials, but in the future, rare earths will be used. It has the potential to develop materials with excellent magnetic properties.

  When using a magnetic material with low thermal conductivity such as temperature-sensitive ferrite, the heating and cooling effects are improved by welding or pressure bonding a plate-like, granular, and powdery magnetic material to a good thermal conductor such as aluminum. You can also increase the speed of movement.

  When the magnetic plate (1) having a Curie temperature in a relatively high temperature range is used, cooling can be performed by natural air cooling, but the magnetic plate (1) in which the Curie temperature is in the low temperature range near or below room temperature. When used, the cooling means (12) is required.

  FIG. 9 is a configuration diagram using the heating means (6) and the cooling means (12) in another embodiment of the present invention.

  As another embodiment of the present invention, an electric heater is used as the heating means (6), and the magnetic plates (1) incorporating the electric heater are connected with an appropriate gap to form a magnetic orbit ( 5).

  In practice, the space between the magnetic plates (1) incorporating the electric heater can be partitioned by a heat insulating plate to reduce heat conduction between them.

  As the heating means (6), various heating such as combustion heat of flammable gas or combustible material, high temperature liquid or gas, condensing heat of sunlight, laser beam, microwave, electromagnetic induction, electric heater, etc. Can do.

  On the space station and the moon surface, high-temperature heating can be performed by the concentrated heat of sunlight.

  When the temperature of the magnet (2) rises due to the heating of the heating means (6), the magnetic field becomes weak and the torque becomes small. Therefore, it is important to take measures against heat to suppress the temperature rise of the magnet (2).

  As in this embodiment, a heat shield (13) is provided around the magnet (2), and in practice, a radiator is attached to the magnet (2), or the magnet (2) is cooled with water to suppress the temperature rise. It is also possible to use an electromagnet or a superconducting magnet in addition to the permanent magnet.

  The embodiment has a configuration of a combination of one magnetic material orbit (5) and one magnet (2). However, in practice, a plurality of magnets (2) or a magnetic material orbit (5) and magnet ( A thermomagnetic actuator having a large driving torque can be configured by connecting a plurality of combinations 2).

  As an application example of the thermomagnetic actuator of the present invention in outer space, for example, a magnetic orbit (5) is provided on or out of the moon or in a space station, or a magnetic orbit ( If 5) is made into a loop shape, a moving body system using the condensed heat of sunlight as a heating source can be constructed.

  In outer space, each magnetic plate (1) is in a vacuum insulated atmosphere, can give a dramatic temperature difference between heated and non-heated regions, and is in a state of weightlessness or near weightlessness. Thus, a mobile system can be constructed, and the present invention can be applied to these systems.

  Thermomagnetic actuators that can heat the magnetic plate (1) in a non-contact manner by laser beam, microwave, or electromagnetic induction are used in a wide range of fields such as medical and space development as well as general industries. Applications can be expected.

DESCRIPTION OF SYMBOLS 1 Magnetic board 2 Magnet 3 Moving direction 4 Magnetic board support body 5 Orbit of magnetic body 6 Heating means 7 Iron core 8 Rail 9 Roller
10 Slide bearing 11 units 12 Cooling means 13 Heat shield plate

Claims (11)

  A magnetic field is created by the magnet (2), and a magnetic material orbit (5) in which magnetic plates (1) of a predetermined size are connected with an appropriate gap is passed through the magnetic field, and the magnet (2) is used as a mobile station for magnetism. The body trajectory (5) is used as a fixed station, a part of the magnetic field is kept at a low temperature, the magnetization of the magnetic plate (1) is strengthened, and the magnetic plate (1) of the other magnetic field is heated (6). The magnet (2) is moved to the orbit (5) of the magnetic material that is kept at a low temperature by demagnetizing the magnetization by heating with the magnetic field and breaking the balance of the magnetization of the orbit (5) of the magnetic material in the magnetic field. A thermomagnetic actuator characterized in that the station generates a pulling force and moves the heating station to move the mobile station.   2. The thermomagnetic actuator according to claim 1, wherein the magnetic material orbit is formed by bending a magnetic material plate having a predetermined width to a predetermined length.   2. The thermomagnetic actuator according to claim 1, wherein the magnetic material orbit has a predetermined width and thickness, and has a groove having an appropriate depth and width at a predetermined interval.   2. The thermomagnetic actuator according to claim 1, wherein the magnetic material orbits (5) are formed with holes of an appropriate size at predetermined intervals.   2. The thermomagnetic actuator according to claim 1, wherein the magnetic material orbits (5) are formed by arranging innumerable magnetic material pieces with appropriate gaps.   2. The thermomagnetic actuator according to claim 1, wherein the magnetic material orbit has a shape similar to that of a stitch.   2. A thermomagnetic actuator according to claim 1, wherein the heating means is gas combustion heat.   The thermomagnetic actuator according to claim 1, wherein the heating means (6) is a high-temperature liquid or gas.   The thermomagnetic actuator according to claim 1, wherein the heating means (6) is an electrothermal heater.   2. The thermomagnetic actuator according to claim 1, wherein the heating means (6) is sunlight condensing heat.   2. A thermomagnetic actuator according to claim 1, wherein said heating means is a laser beam.

Images