JPH07147708A - Method and equipment for reducing driving resistance for magnetically levitation - Google Patents

Abstract

PURPOSE:To provide a method and an equipment for reducing driving resistance for a magnetically levitated body diminishing magnetic repulsive force and suction force generated at the time of levitation and travelling at high speed and given to the magnetically levitated body as much as possible, lowering propulsive resistance and capable of increasing the speed of the magnetically levitated body and saving power thereof. CONSTITUTION:In a magnetically levitated body A levitated by utilizing an electric induction phenomenon by the induction coils 2 of one body 1 and the superconducting magnets 4 of the other body oppositely installed to the induction coils 2 and propelled and rotated, operating means 5 being operated by the magnetic force of the superconducting magnets 4 and conducting connection and disconnection are mounted on their midways of the circuits of the induction coils 2.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and apparatus for reducing drive resistance such as propulsion and rotation applied to a superconducting magnet generated by electromagnetic induction of an induction coil when a magnetic levitation body is levitated.

[0002]

2. Description of the Related Art At present, as a development of a new transportation system, a magnetic levitation type propulsion technology is known in which a vehicle is run in a contactless manner by using a linear motor.

In this linear motor car, a superconducting coil magnet is housed in a liquid helium container on the vehicle to make it a strong magnet, and is levitated by an induced repulsive force generated by running on an induction coil provided on a ground track. And the propulsive force is obtained by the linear synchronous motor installed on the side of the track, 500 Km / h
Realized high speed running.

However, the electromagnetic induction of the superconducting magnet on the vehicle causes an induction current in the induction coil on the ground,
Since a magnetic pole that repels the superconducting magnet on the vehicle is generated to try to levitate the vehicle, it goes without saying that V = −nΔΦ / Δt as in Faraday's law of electromagnetic induction.
Therefore, the higher the increasing speed of the magnetic flux, the larger the induced electromotive force V becomes, but if the speed is slow, the repulsive force for levitating the vehicle of the linear motor car will not be generated, so 100 Km / h It runs tire wheels up to the front and rear speeds, and then shifts to magnetic levitation.

Also, when the superconducting magnet 31 on the vehicle 30 is about to reach the induction coil 33 on the ground 32 at a point indicated by the symbol a as shown in FIG. The induction coil 33 has the same magnetic pole as the superconducting magnet 31 on the vehicle 30 due to the rapid increase in the magnetic flux Φ, and repulsively generates a levitation force, but at the same time, pushes the linear motor car in the direction opposite to its traveling direction. The power to return it works.

Then, as shown in FIG. 5, at a point indicated by reference numeral b, the induction coil 33 is a superconducting magnet on the vehicle 30.
When 31 is about to pass, the induction coil 31 on the ground 32 rapidly reduces the magnetic flux, becomes the opposite magnetic pole of the superconducting magnet 31 on the vehicle 30, attracts the superconducting magnet 31, and moves the linear motor car. The power to pull back works.

The force acting to hinder the progress of the linear motor car between points a and b in FIG. 5 shown in FIG. 5 uses the induced repulsive force of the ground coil 33 to make the linear motor car levitate. As mentioned above, the propulsion resistance was unavoidable, and in principle it is also clear from Lenz's law.

At present, in the magnetic levitation type linear motor car under experiment at JR, the superconducting magnet on the car is lengthened in the traveling direction (length 1.5 m × width 0.5 m) in an attempt to reduce this propulsion resistance as much as possible. As a long elliptical track-shaped superconducting magnet, it is installed so as to straddle several induction coils on the ground, but this is not a fundamental countermeasure and the levitation traveling speed remains around 500 Km / h. is the current situation.

Further, as the levitation traveling speed becomes faster, the induced electromotive force becomes larger and the magnetic repulsion becomes larger due to Faraday's law. Therefore, the propulsion resistance increases in proportion to obtain the propulsion force. In addition, the power consumption of the linear synchronous motor provided on the side of the track also increases.

The existence of such a resistance has been a bottleneck in speeding up and power saving of the linear motor car. There were various problems such as.

[0011]

SUMMARY OF THE INVENTION The present invention has been made in order to solve the above-mentioned problems, and it is an electric induction using an induction coil of one body and a superconducting magnet of the other body opposite to the induction coil. In a magnetic levitation body that uses the phenomenon to levitate, propels and rotates, by providing an operating means for connecting and disconnecting by operating by the magnetic force of the superconducting magnet in the middle of the induction coil circuit, the levitation speed is increased. A magnetic levitation body capable of reducing the propulsive resistance by reducing the magnetic repulsion force and the attraction force generated when traveling to the magnetic levitation body as much as possible to speed up the magnetic levitation body and save power. It is an object of the present invention to provide a driving resistance reduction method and device for a vehicle.

[0012]

The means of the present invention for achieving the above-mentioned object is to provide a large number of induction coils installed on one body and a large number of superconducting bodies installed on the other body in opposition to the induction coils. A magnetic levitation body in which one body or the other body is levitated and propelled / rotated by a magnet, and is connected and disconnected by being actuated by the magnetic force of the superconducting magnet in the middle of the circuit of the induction coil. When the operating means is provided, when the superconducting magnet does not correspond to the operating means, the induction coil is disconnected so that no induced current is generated, and when the superconducting magnet corresponds to the operating means, the induction coil is connected to induce the induction current. It is a method for reducing drive resistance for a magnetic levitation body that generates a current and generates a repulsive force.

Further, one body or the other body is levitated and propelled / rotated by a large number of induction coils installed on one body and a large number of superconducting magnets provided on the other body in opposition to the induction coils. In the magnetic levitation body, there is provided a drive resistance reducing device for a magnetic levitation body, which is provided with an operation means for connecting and disconnecting by operating by the magnetic force of the superconducting magnet in the middle of the circuit of the induction coil.

Further, the operating means comprises a pair of terminals provided in the middle of the circuit of the induction coil, and an actuating member which comes into contact with and separates from the terminals. The actuating member is a magnet attracted by the magnetic force of the superconducting magnet or It is characterized by being a magnetic body and an induction coil having a repulsive force due to the magnetic force of the superconducting magnet.

[0015]

The method and apparatus for reducing drive resistance for a magnetic levitation body according to the present invention configured as described above have the following effects.

When a magnetic levitation body equipped with an induction coil installed in one body having an operating means and a superconducting magnet installed in the other body is levitated and run, as shown by point a in FIG. Even if it approaches the induction coil of one body, the induction coil is in a disconnected state until the operating means is activated by the magnetic force of the superconducting magnet.

Therefore, although an induced electromotive force is generated, an induced current does not flow, a magnetic field is not generated, and a repulsive force is not generated. Therefore, a force for pushing back the magnetic levitation body does not work.

As shown in FIG. 3, when the superconducting magnet of the other body advances to the front and back of the center line s of the induction coil, when the superconducting magnet acts on the actuating member in the operating means, the magnetic flux rapidly increases, The same magnetic pole as that of the superconducting magnet is generated in the induction coil, and both have a repulsive force, but since the superconducting magnet has advanced to around the center line s of the induction coil, the force that works to push back the magnetic levitation body. than,
Since the force acting to levitate is stronger, the propulsive resistance to the magnetic levitation body is greatly reduced.

Further, when the superconducting magnet of the other body tries to pass over the induction coil of the one body, as indicated by point b in FIG. 3, a magnetic pole opposite to that of the superconducting magnet is generated due to a rapid decrease in magnetic flux. When trying to attract and pull back the magnetic levitation body, when the rear end of the superconducting magnet of the other body reaches around the center line s of the induction coil of the other body, the magnetic force of the superconducting magnet causes the operating body of the operating means to operate and induce the induction. Since the inside of the coil circuit is switched from the connected state to the disconnected state, the induction current does not flow in the induction coil of one body.

Therefore, since the magnetic field also disappears, the force for pulling back the magnetic levitation body does not work, so that the propulsion resistance of the magnetic levitation body can be greatly reduced.

Reducing the above-mentioned propulsion resistance, that is, power consumption for propelling the magnetic levitation body, for example, when a propulsive force is obtained by a linear synchronous motor to propel and rotate the levitation at high speed, It is possible to increase the speed limit of high-speed propulsion / rotation of the magnetic levitation body to near the limit of the polarity switching frequency in the linear synchronous motor.

[0022]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the method and apparatus for reducing drive resistance for a magnetic levitation body according to the present invention will be described below with reference to the drawings.

The drive resistance reducing device for a magnetic levitation body according to the embodiment of the present invention is adopted for a magnetic levitation body using a linear motor. For example, this magnetic levitation body is a linear motor which is attracting attention as a new transportation system. It can be expected to reduce the propulsion resistance by using it for take-off and launching devices in cars, aircraft, rockets, space vehicles, etc., and it can be expected to reduce the rotation resistance in superconducting synchronous motors and superconducting generators. And its use in a wide range of fields.

In the embodiment of the present invention, an example in which the magnetic levitation body is adopted in a linear motor car will be shown.

In FIG. 1 and FIG. 3, A is a magnetic levitation body such as a linear motor car. Conceptually, a large number of induction coils 2 installed on one body 1 and another induction coil 2 placed opposite the induction coil 2 Basically, the one body 1 or the other body 2 is levitated and propelled by a large number of superconducting magnets 4 provided in 3.

The relative positional relationship between the one body 1 and the other body 2 can be appropriately changed.

A large number of the above-mentioned induction coils 2 are arranged at intervals on the one body 1, that is, on the ground 1 provided with a track.

In the other body 3, that is, the vehicle 3, the above-mentioned superconducting magnets 4 are arranged such that a large number of N poles and S poles are alternately arranged at intervals so as to correspond to the induction coil 2 on the ground 1. To be

As shown in FIGS. 1 to 4, operating means 5 are provided in the middle of the winding of the induction coil 2 and are operated by the magnetic force of the superconducting magnet 4. When the superconducting magnet 4 does not correspond to the operating means 5, the induction coil 2 is disconnected and an induction current is not generated. When corresponding to the operating means 5, the operating means 5 connects the induction coil 2 to generate an induced current to generate a repulsive force. The operating means 5 is, for example, in the upper part inside the induction coil 2 wound in an annular shape. 2 center line s
It is attached to the front of the vehicle 3 in the traveling direction.

Further, the winding of the induction coil 2 in the middle of the circuit is cut, and a pair of terminals 6 and 6 are attached to both ends thereof. An operating body 7 that comes in contact with and separates from the operating body 7 is provided on a cylinder 8 via a slide shaft 9 so as to be able to move up and down. A contact piece 10 is attached to the upper surface of the operating body 7.

At the lower end of the sliding shaft 9 described above,
Since a downward force is normally urged by the tension spring 11, the actuator 7 attached to the upper end of the sliding shaft 9
The contact piece 10 is held apart from the terminals 6 and 6.

The actuating body 7 is formed of a magnetic material such as a magnet or an iron plate attracted by the magnetic force of the superconducting magnet 4 of the vehicle 3.

The terminals 6, 6 and the operating body 7 are
It is covered with a protective cover 12 in a sealed state.

With the above-mentioned structure, the operating means 5 causes the superconducting magnet 4 attached to the vehicle 3 to be an induction coil on the ground 1 at a position X in FIG. 3 as the vehicle 3 advances. Even when it approaches 2, the induction coil 2 is in a disconnected state until the actuation body 7 is actuated by the magnetic force of the superconducting magnet 4.

Therefore, although an induced electromotive force is generated in the induction coil 2 by the superconducting magnet 4, an induction current does not flow, so that a magnetic field is not generated and a repulsive force is not generated. The force to push back against does not work either.

Next, when the superconducting magnet 4 advances to the front and back of the center line s of the induction coil 2 at the X position in FIG. 3 (a), the magnetic force of the superconducting magnet 4 to the actuating body 7 in the operating means 5 is increased. When actuated, the actuating body 7 rises against the tension spring 11 due to the attraction force, and when the contact piece 10 comes into contact with the terminals 6 and 6, a rapid increase in magnetic flux causes the induction coil 2 to move to the superconducting magnet 4. The same magnetic pole occurs.

Then, both of them 2 and 4 have a repulsive force, but the superconducting magnet 4 has the center line s of the induction coil 2.
Since the vehicle has moved forward and backward, the force acting to levitate the vehicle 3 is stronger than the force acting to push the vehicle 3 back, so that the propulsive resistance to the vehicle 3 is significantly reduced.

Further, as indicated by a point b in FIG.
When the superconducting magnet 4 of FIG. 2 tries to pass over the induction coil 2 on the ground 1, a magnetic pole opposite to that of the superconducting magnet 4 is generated due to the rapid decrease in magnetic flux, and the vehicle 3 is attracted and pulled back. When the rear end reaches around the center line s of the induction coil 2 on the ground 1, the magnetic force of the superconducting magnet 4 weakens and the actuating body 7 in the operating means 5 is lowered by the tension spring 11 attached to the sliding shaft 9. Since the contact piece 10 is separated from the terminals 6 and 6 and the inside of the circuit of the induction coil 2 is changed from the connection state to the disconnection state, no induction current flows in the induction coil 2 on the ground 1.

Therefore, since the magnetic field also disappears, the vehicle 3
Since the force to pull back the magnetic suspension does not work, the propulsion resistance of the magnetic levitation body A can be greatly reduced.

As another example of the operating body 7 in the operating means 5, an induction coil having a repulsive force due to the magnetic force of the superconducting magnet 2 can be used. In this case, as shown in FIG. Since an upward spring is normally urged to the slide shaft 9 connected to the slide shaft 9 by the expansion spring 13 mounted in the cylinder 8, the actuator 7 attached to the upper end of the slide shaft 9 is The contact piece 10 is held in contact with the terminals 6 and 6.

[0041]

As described above, in the method and apparatus for reducing the drive resistance for a magnetic levitation body according to the present invention, the magnetic force of the superconducting magnet is increased until the superconducting magnet of the other body reaches the induction coil of the one body. Since the superconducting magnet is provided with an operating means for exerting its magnetic force when it reaches the central portion of the induction coil, the repulsive force of both generated when the superconducting magnet does not reach the induction coil. And, the propulsion / rotational resistance generated by the attraction force when the superconducting magnet is separated from the induction coil can be reduced as much as possible, thereby achieving a higher speed of the magnetic levitation body and driving it. This has a unique effect of being able to significantly reduce power consumption.

[Brief description of drawings]

FIG. 1 is a side view showing an outline of a magnetic levitation drive resistance reducing apparatus that employs an embodiment of a magnetic levitation drive resistance reduction method according to the present invention.

FIG. 2 is an enlarged cross-sectional view showing an operating means in FIG.

3 is an explanatory diagram showing an operating state of the device in FIG. 1. FIG.

FIG. 4 is a cross-sectional view showing another example of the operating means in FIG. 2 in an enlarged manner.

FIG. 5 is an explanatory diagram showing an operating state of a conventional linear motor car.

[Explanation of Codes] A magnetic levitation body 1 one body 2 induction coil 3 other body 4 superconducting magnet 5 operating means 6, 6 terminals 7 working body

Claims (4)

[Claims] 1. A large number of induction coils installed on one body,
A large number of superconducting magnets provided on the other body in opposition to this induction coil cause one body or the other body to float and propel it.
In a magnetic levitation body to be rotated, operating means for connecting and disconnecting by operating by the magnetic force of the superconducting magnet is provided in the middle of the circuit of the induction coil, and the superconducting magnet does not correspond to the operating means. In this case, the magnetic levitation is characterized in that when the superconducting magnet corresponds to the operating means without disconnecting the induction coil and causing an induction current, the induction coil is connected to generate an induction current and generate a repulsive force. How to reduce body drive resistance. 2. A large number of induction coils installed on one body,
In a magnetic levitation body in which one body or the other body is levitated and is propelled / rotated by a large number of superconducting magnets provided opposite to the induction coil in the other body, in the middle of the circuit of the induction coil, A drive resistance reducing device for a magnetic levitation body, which is provided with an operating means which is operated by magnetic force of a superconducting magnet to perform connection and disconnection. 3. The operating means comprises a pair of terminals provided in the middle of the circuit of the induction coil, and an actuating body that comes into contact with and separates from the terminals, the actuating body being a magnet attracted by the magnetic force of the superconducting magnet or a magnet. The drive resistance reducing device for a magnetic levitation body according to claim 2, wherein the drive resistance reducing device is a magnetic body. 4. The operating means comprises a pair of terminals provided in the middle of the circuit of the induction coil, and an actuating body that comes into contact with and separates from the terminals, and the actuating body has an induction force having a repulsive force due to the magnetic force of the superconducting magnet. The drive resistance reducing device for a magnetic levitation body according to claim 2, which is a coil.