JPH0734673B2 - Electromagnetic drive - Google Patents

Description

TECHNICAL FIELD The present invention relates to an electromagnetic drive device that moves a piston up and down by an electromagnetic repulsive force or an electromagnetic attractive force.

[Problems to be Solved by Related Art and Invention] Today, as this type of electromagnetic drive device, a so-called magnetic engine is proposed which outputs vertical movement of a piston generated by electromagnetic force as a rotational force via a crank mechanism. There is.
As such, an electromagnet provided in the cylinder head is excited by energization that is timed to the vertical movement of the piston to which the permanent magnet is fixed, and the electromagnetic repulsive force or electromagnetic attractive force generated by this is excited. It is known that a piston is configured to generate power by forcibly moving it downward or upward. However, the conventional one simply switches between excitation and demagnetization at the top dead center and bottom dead center of the piston in order to excite the electromagnet in the descending stroke or ascending stroke of the piston. However, it has a drawback that the heat generation is extremely low, the efficiency is low, and the power consumption is large. As a result, a high output cannot be obtained and it cannot be put to practical use.

[Means for Solving the Problems] The present invention was devised with the object of providing an electromagnetic drive device capable of eliminating these drawbacks in view of the above-mentioned circumstances, and a permanent magnet is provided. An electromagnetic drive device, in which an electromagnet for generating a magnetic field repelled by the permanent magnet is provided at a position facing a permanent magnet of a cylinder into which the piston is linearly reciprocally fitted while the piston is connected to a crank mechanism. The drive device is provided with an excitation means whose excitation timing is set so as to excite the electromagnet within a range in which the crank angle changes from the top dead center position of the piston to 90 ° after the top dead center. It is what

Further, an electromagnetic drive device is provided, in which a piston provided with a permanent magnet is connected to a crank mechanism, and an electromagnet generating a magnetic field for attracting the permanent magnet is provided at a position facing a permanent magnet of a cylinder into which the piston is linearly reciprocally fitted. Then, the electromagnetic drive device is provided with an excitation means whose excitation timing is set so as to excite the electromagnet within a range in which the crank angle changes from the position of 90 ° before the top dead center to the top dead center. It is characterized by that.

Further, according to the present invention, the power consumption can be reduced and the heat generation of the exciting coil can be suppressed as much as possible so that the remarkable output up can be measured.

[Embodiment] Next, an embodiment of the present invention will be described with reference to the drawings. In the drawing, reference numeral 1 denotes a cylinder of a magnetic engine (electromagnetic drive device), the cylinder 1 is formed in a cylindrical shape, and a lower opening 1a thereof has a small diameter so that a piston 2 described later can be loosely fitted therein. The electromagnet 4 is integrally fitted in the upper opening 1b formed in the guide hole 1a and having a large diameter. The electromagnet 4 is formed by winding an exciting coil 4b around a core 4a, and can be excited by a drive circuit 5 described later.

The piston 2 has an intermediate portion vertically guided by a slide bearing 6, and a lower end portion connected to a crank arm 8a via a connecting rod 7. On the other hand, an upper end fitted into the cylinder 1 is repelled by excitation of an electromagnet 3. The permanent magnet 9 that receives the force is fixed. As will be described later, as the piston 2 moves up and down, the crank shaft 8 protruding leftward and rightward from the crank arm 8a rotates, but a flywheel 10 is attached to one end of the crank shaft 8 so as to rotate integrally. The crank angle sensor 11 is connected to the other end. The crank angle sensor 11 is of a so-called optical type in which the position of the slit 11b of the disk 11a which rotates integrally with the crankshaft 8 is detected by the light emitting diode D and the phototransistor Tr.

On the other hand, the drive circuit 5 includes the exciting coil 4b, the crank angle sensor 11, the battery 12, and the transistor Tr.
1, Tr2 is composed of a resistor, a diode and the like. That is, in the drive circuit 5, in the crank angle sensor 11, the light emitted from the light emitting diode D is blocked by the disk 11a,
The phototransistor Tr is OFF, the transistor Tr1 is ON, and the transistor Tr2 is OFF, so that the excitation coil 4b is not energized and the phototransistor Tr is the slit 1 of the disk 11a.
When the light emitted from the light emitting diode D is received via 1b,
The phototransistor Tr turns ON, and the transistor Tr1
Is turned off and the transistor Tr2 is turned on to excite the exciting coil 4b, but the slit 11b of the disk 11a described above is excited.
Is a crank angle of 0 ° (top dead center) to 90 ° (90 after top dead center).
Up to ()), the phototransistor Tr is opened to allow light to be received.

In the embodiment of the present invention configured as described above, the electromagnet 4 is excited at the timing of the downward stroke of the piston 2 to push down the piston 2 which receives the repulsive force, thereby rotating the crankshaft 8. However, the electromagnet 4 does not excite the entire range of the downward stroke of the piston 2, and the crank angle is 0 ° (top dead center) to 90 ° (90 ° after top dead center).
It will be excited only in the range up to (°). That is, the axial torque T of the crankshaft 8 is the product of the effective crank arm length A and the repulsive force received by the piston 2, and the repulsive force is inversely proportional to the square of the distance B between the two magnets. The axial torque T when the electromagnet 4 is excited in the entire range of the descending stroke of No. 2 draws the graph curve T shown in FIG. 4, but in the present embodiment, the crank output effectively as the axial torque T The electromagnet 4 is excited only in the range from 0 ° (top dead center) to 90 ° (90 ° after top dead center). Therefore, the energization time of the exciting coil 4b can be greatly shortened without sacrificing the output shaft torque T, and as a result, the power consumption can be significantly reduced. Moreover, since it is possible to suppress the heat generation of the exciting coil 4a to a small level, it is possible to avoid a decrease in the magnetic force due to the heat generation and measure a remarkable output up. It is possible to measure various output up.

It should be noted that the present invention is not limited to the above-mentioned embodiment, and the point is that the electromagnet is excited only within a range in which the shaft torque can be effectively output. Needless to say, it can be implemented not only by using the electromagnetic repulsive force as in the example but also by using the electromagnetic attractive force.As for the excitation timing of the electromagnet, when the electromagnetic repulsive force is used, the crank angle is Within the range from the piston top dead center position to 90 ° after top dead center, within the range where the crank angle changes from 90 ° before top dead center to top dead center in the case of using electromagnetic attraction force. It can be set freely.

[Advantages] In summary, since the present invention is configured as described above, the piston is reciprocated by the excitation of the electromagnet that is timed to the reciprocation of the piston, and the piston is reciprocated from the crankshaft constituting the crank mechanism. Although it is output as a rotational force, the electromagnet is excited only within a predetermined crank angle range that can be effectively output as an axial torque. Therefore, the energization time of the exciting coil can be greatly shortened while the output shaft torque is hardly sacrificed, and as a result, the power consumption can be significantly reduced. Moreover, since it is possible to suppress the heat generation of the exciting coil to a small extent, it is possible to surely avoid a decrease in magnetic force due to heat generation and measure a remarkable output up, or it is possible to flow more current to the exciting coil. It is possible to realize various output up.

[Brief description of drawings]

The drawings show one embodiment of an electromagnetic drive device according to the present invention, and FIG. 1 is a schematic vertical sectional view of the electromagnetic drive device.
FIG. 2 is a circuit diagram showing a drive circuit, FIGS. 3A, 3B and 3C are longitudinal sectional views showing the operation of the electromagnetic drive device, and FIG. 4 is a graph diagram for explaining the operation. In the figure, 1 is a cylinder, 2 is a piston, 4 is an electromagnet, 4a is a core, 4b is an exciting coil, 5 is a drive circuit, 6 is a permanent magnet,
Reference numeral 8 is a crank shaft, 8a is a crank arm, and 9 is a permanent magnet.

Claims (2)

[Claims] 1. A piston provided with a permanent magnet is connected to a crank mechanism, and an electromagnet for generating a magnetic field repelling by the permanent magnet is provided at a position opposed to the permanent magnet of a cylinder into which the piston is linearly reciprocally fitted. An electromagnetic drive device, wherein the electromagnetic drive device has an excitation timing set to excite the electromagnet within a range in which a crank angle changes from a piston top dead center position to 90 ° after top dead center. An electromagnetic drive device comprising means. 2. A piston provided with a permanent magnet is connected to a crank mechanism, and an electromagnet for generating a magnetic field for attracting the permanent magnet is provided at a position facing a permanent magnet of a cylinder into which the piston is linearly reciprocally fitted. An electromagnetic drive device, wherein the electromagnetic drive device has excitation timing set so as to excite the electromagnet within a range in which a crank angle changes from a position of 90 ° before top dead center to top dead center. An electromagnetic drive device comprising: