JPS5939961B2 - In-car power supply for ultra-high-speed magnetic levitation trains - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement of an in-vehicle power supply device for an ultra-high-speed floating train equipped with superconducting magnets.

FIG. 1 shows a configuration diagram of a conventional example for obtaining a non-contact in-vehicle power supply device that utilizes the armature reaction magnetic flux of a propulsion coil in an ultra-high-speed floating train.

Using the magnetic flux created by the superconducting coil 2 provided in the vehicle body 1.

A propulsive force, a guiding force (horizontal restoring force), and a levitating blade are obtained by interaction with the currents flowing through the propulsion coil 4, the guide coil 5, and the levitation coil 6 provided on the ground 3.

Here, an induction power supply coil 7 is installed on the vehicle 1 opposite the propulsion coil 4, and a harmonic component (generally a third harmonic in time) of the armature reaction magnetic flux generated by the propulsion coil 4 is generated.

), the induced voltage generated in the induction power supply coil 7 is transmitted to the in-vehicle power supply load 9 such as a fluorescent light or air conditioner via a power converter 8.
to supply power.

Fig. 2 shows an example of the arrangement of the propulsion coil 4 and the induction power feeding coil 7. The propulsion coil 4 uses three-phase single-layer concentrated winding with a pitch of 120° for ease of coil installation.
Similarly, from the viewpoint of ease of installation, a horizontal phase single concentrated winding coil with a pitch of 60° is used as the induction power feeding coil 7.

Therefore, between the two pole pitches 2γ, the propulsion coil 4 is U,
V, W, three poles, induction power supply coil 7 is R, S, T
There are two sets of , that is, four poles.

This means that the second harmonic of the spatial harmonic C of the reaction magnetic flux of the propulsion coil 4 is the largest.

) generates a time triple harmonic induced voltage in the induction power feeding coil 7.

Next, the effective output induced in the induction power feeding coil 7 in the conventional example will be calculated.

The propulsion coil is 1.8m long x 0.7m wide, pitch 2.
1m, magnetomotive force (effective value) 9KAT/coil, 0.95m length x 0.8m width, pitch 1.0 as an induction power supply coil
5m.

When the gap between the centers of both coils is 0.12 m, the time triple harmonic magnetic flux interlinking with one turn of the induction feeding coil has an effective value of 3.7 (mWb).

Therefore, we decided to change the coil arrangement of the induction power supply coil to 2×5 (=1
0 turn), the vehicle will float at 500Xm/h2
The phase voltage induced in one 5 m long vehicle is determined as follows.

The voltage e induced in the induction feeding coil is expressed by the following equation.

Here, N is the number of turns of the induction feeding coil, and ω is the angular frequency of the induced voltage.

Three coils are installed per pole of the propulsion coil, and triple harmonic voltage is induced using twice the space harmonics, so ω is ω=2 rr f=2 πX ((500Xm /h to m
/see) ÷ propulsion coil pitch) x harmonic = 2πX
It becomes 22X3.

Two induction feeding coils are wound (2x5) turns per pole of the propulsion coil, so if you add up the four poles on each side, N is:

N=(2X5)X(2X4X2) becomes.

The induced voltage E per 1 effective value of the magnetic flux interlinking with the induction feeding coil is X(2X5)X(8X2)=246 (V).

If the phase current is 40 (A), the internal resistance drop is RI=2
4 (V), and the internal reactance drop is X■ = 73 (V), so the terminal voltage decreases to Vt = 179 (V).

Considering the in-vehicle power source load power factor e08θ20.8, the effective output per vehicle is as follows.

p= 3 V tI cosθ=3X179X40X0
．． 8X 10-” = 17 (I@) The on-board power supply for ultra-high-speed trains also requires a refrigerator for the helium used to cool the superconducting magnets.Lenote 100 (KW)
is said to be necessary.

To increase the propulsion coil magnetomotive force from 9 (KAT/coil) to 20 (KAT) to increase from 17 (KW:) to 100 (KW)
/coil).

At this time, since the required thrust of the ultra-high-speed levitated train is fixed, in order to obtain the same thrust, the magnetomotive force of the superconducting coil must be reduced by approximately 1
/2, which is undesirable because it significantly reduces the power factor and efficiency of the power source that feeds the propulsion coil.

It is generally not possible to significantly increase the power supply capacity for an in-vehicle power supply.

As mentioned above, conventional non-contact in-vehicle power supplies that utilize the reaction magnetic flux of the propulsion coils have a fatal drawback of low effective output.

An object of the present invention is to obtain an in-vehicle power supply device that can obtain a large amount of active power required for ultra-high-speed magnetic levitation trains.

In the conventional case where the reaction magnetic flux of the propulsion coil is used as the in-vehicle power source, the propulsion coil current is passed from outside, but the present invention induces the propulsion coil current in the levitation short-circuit coil (levitation coil) as the train progresses. This method focuses on the fact that the levitation coil magnetomotive force becomes much larger (more than 5 times) than the propulsion coil magnetomotive force due to current.

In other words, an induction power feeding coil is placed on the surface opposite to the levitation coil of a superconducting magnet, and the time harmonic voltage induced in the power feeding coil on the vehicle by the spatial harmonic components of the reaction magnetic flux generated by the levitation coil is used as a power source. It is characterized by its use as a

FIG. 3 is a block diagram showing an embodiment of a super high-speed floating train equipped with an in-vehicle power supply device according to the present invention.

In the figure, a superconducting coil 2 is placed on a vehicle body 1, and a ground 3
The configuration in which the propulsion coil 4, guide coil 5, and levitation coil 6 are arranged is the same as before.

The characteristic feature of the present invention is that in order to utilize the harmonic magnetic flux from the levitation coil 6, an induction power feeding coil 10 is installed in the vehicle body 1 facing the levitation coil 6Fc, and the induced voltage generated in this coil 10 is The power is supplied to an in-vehicle power load 9 such as a fluorescent furnace or a refrigerator through a power converter 8.

The induction power feeding coil 10 is placed directly on the surface of the superconducting coil 20 or with an intermediate material interposed therebetween.

The power converter 8 may be a transformer, a rectifier, a frequency converter, a motor generator, etc., but this power converter 8 can be omitted and the induced voltage of the induction power supply coil 10 can be directly connected to the in-vehicle power supply load 9. You can also.

Further, by configuring the power converter 8 by connecting a rectifier and a battery in parallel, it is possible to obtain a DC in-vehicle power source while charging the battery.

FIG. 4 shows an example of the arrangement of the levitation coil 6 and the induction power supply coil 10. The levitation coil 6 consists of three-phase single-layer concentrated windings with a 60° pitch, and the induction power supply coil 10 consists of three-phase single-layer windings with a 24° pitch. Consists of concentrated winding coils Therefore,
Between the two pole coil pitches 2γ, the floating coils 5 are U, -W, and V.
, -tLW.

- ■ and 6 2 poles, induction power supply coil 10 is R9S, T
A total of 15 lO poles are provided in this order.

Next, the reaction magnetic flux of the levitation coil 60 is transferred to the induction power supply coil 1.
The principle used for zero induced voltage will be briefly described.

Generally, the spatial distribution of the reaction magnetic flux density from the levitation coil 6 is given by the following equation.

Here, n = 1t2t... An = constant τ = pole pitch It is expressed by the following formula.

Here, s C6n 1 w C6n + 1 is a constant and ω, the angular frequency of the two levitation coil currents, and t = time.
When converted into x=X+vt, (V is the train speed), the voltage induced in the induction power supply coil 10 is expressed as follows.

Here, N = Number of turns of the induction power supply coil λ The length of the two-induction power supply coil is 6n-L K6n+1s C6n-IjC6n+1 is a constant If the ball pitch of the induction power supply coil 10 is γC1 The angular frequency is ωC, the induction power supply The moving magnetic field wave generated by the working coil 10 changes τC with sin (ωct+−x).

Levitation coil 60 Inductive power feeding coil 1 based on reaction magnetic flux
In order to effectively utilize zero induced voltage, this induced voltage and the moving magnetic field wave generated by the induction power feeding coil 10 must change at the same frequency and speed.

Therefore, the following formula holds true.

From this, ωc==6nω Therefore, the pitch of 100 poles of the induction power supply coil must be 1/(6n±1) times the pitch of 60 poles of the levitation coil, and the frequency of the induced voltage of the coil 10 for induction power supply at this time is The frequency is 6n times the frequency of the current in the coil 6.

Since the fifth harmonic is large in the spatial frequency of the levitation coil 6, it is sufficient to consider only the first term of the equation of the voltage approximately induced in the induction power supply coil.

That is, as shown in FIG. 4, the number of poles of the induction power supply coil may be five times that of the levitation coil, and at this time, a voltage of the sixth temporal harmonic is induced in the induction coil 10.

Therefore, the effective output induced in the induction power feeding coil 10 in FIGS. 3 and 4 showing an embodiment of the present invention will be calculated.

The levitation coil is 0.675 m long x 0.4 m wide, pitch 1.05 m, magnetomotive force (effective value) 43 KAT/coil, and the induction power supply coil is 0.32 m long x 0.5 wide, pitch Q, 42 m.

Assuming that the center-to-center gap between both coils is 0.12 m, the temporal sixth harmonic magnetic flux interlinking with one turn of the induction power supply coil has an effective value of 5.0 (mWb) as shown in Figure 5. Become.

Therefore, the arrangement of the induction power supply coils is 2 x 3 (=6
(turn), the 25 car will fly at a speed of 500 km/h.
The phase voltage induced on one side of one m-long car is as follows.

E==5.0X10 ”X(2πx22x6)x6
X (10X2) = 498 (V) RI = 4 (V), internal reactance drop is XI = 60 ■
Therefore, the terminal voltage decreases to Vt=456 (V).

Considering the in-vehicle power supply load power factor cos θ=0.8, the effective output per vehicle is as follows.

P = 3 V tI cosθ=ax456x100
X2xo, 8xlO” = 220 (KW) In other words, 220 (KW), which is more than 10 times the conventional
It can be seen that a large-capacity effective output can be easily obtained.

As described above, according to the present invention, by installing an induction power supply coil on the surface of the vehicle-mounted superconducting magnet facing the levitation coil, it is possible to obtain an in-vehicle power source with a larger effective output than conventional ones. I can do it.

[Brief explanation of the drawing]

Fig. 1 is a configuration diagram showing an ultra-high-speed floating train including a conventional in-train power supply device, Fig. 2 is a schematic perspective view showing an example of the arrangement of conventional propulsion coils and induction power supply coils, and Fig. 3 is an in-car interior according to the present invention. FIG. 4 is a schematic perspective view showing an example of the arrangement of a levitation coil and an inductive power supply coil according to an embodiment of the present invention; FIG. 5 is an inductive power supply system It is a characteristic diagram showing the amount of interlinkage magnetic flux of the coil for use. 2... Superconducting coil, 6... Levitation coil, 8...
Power converter, 9...In-vehicle power supply load, 10...Inductive power supply coil.

Claims (1)

[Claims] 1. A superconducting magnet is placed on the train, a levitation short-circuit coil is placed on the ground facing the ultra-high-speed magnet, and an induced current is applied to the levitation short-circuit coil as the train progresses. In an ultra-high-speed magnetic levitation train that induces magnetic repulsion levitation blades to the train, an induction power feeding coil is arranged on the side of the superconducting magnet on the train that faces the levitation short-circuit coil,
An in-vehicle power supply device for an ultra-high-speed magnetic levitation train, characterized in that electric power generated in the induction power supply coil by the reaction magnetic flux of the levitation short-circuit coil is used as an in-vehicle power source. 2. In the item described in claim 1, the pole pitch of the induction power feeding coil is set to γ/(6n±1) (n: natural number), where γ is the pole pitch of the levitation shorting coil. An on-board power supply system for an ultra-high-speed magnetic levitation train. 3. An in-vehicle power supply device for an ultrahigh-speed magnetic levitation train according to claim 2, wherein the pole pitch of the induction power feeding coil is 115 times the pole pitch of the levitation short-circuit coil.