JP2007306736A - Magnetic levitation mobile unit - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a magnetic levitation mobile unit, in which the current collection power by a current collection coil can be increased. <P>SOLUTION: A current collection coil section 20 is constituted of a two layer coil, consisting of a surface current collection coil 20A provided on the ground coil side, and a backside current collection coil 20B provided on the vehicle side. The surface current collection coil 20A and the backside current collection coil 20B are connected in series, and the number of turns of the collection coil 20A is set larger than that of the backside current collection coil 20B. Furthermore, the number of turns of the collection coil 20A and the backside current collection coil 20B is adjusted, such that a current flowing through the collection coil 20A by electromagnetic induction of a harmonic magnetic field generated by the ground coil becomes equal to a current flowing through the collection coil 20B. Since the loss, based on an eddy current generated by the currents flowing through the surface current collection coil 20A and the backside current collection coil 20B, is reduced, current collection power can be increased. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a magnetic levitation moving apparatus, and more particularly to a magnetic levitation moving apparatus that collects electric power by a current collecting coil by electromagnetic induction of a magnetic field generated by a ground coil.

  Conventionally, as one of the current collection methods for magnetically levitated moving bodies that are supported and driven by electromagnetic force in a non-contact manner, such as superconducting magnetically levitated railway vehicles, electromagnetic induction using the harmonic component of the magnetic field of the ground coil is used. A current collecting system using a non-contact induction current collecting device that collects electric power in a non-contact manner in a magnetically levitated moving body is used.

  Also, in the superconducting magnetic levitation vehicle of the side wall levitation method, the superconducting coil housed in the superconducting magnet cryogenic container is attached to both lower side surfaces corresponding to the carriage of the vehicle, and is provided on the inner surface of the side wall of the track having a U-shaped cross section. The vehicle is driven by the moving magnetic field generated by the propulsion ground coil. In addition, on the inner side of the propulsion ground coil provided on the inner surface of the side wall of the track, a levitation ground coil short-circuited in the shape of a figure 8 is arranged along the traveling direction of the vehicle, facing the superconducting coil. ing.

  Here, the current collecting coil arranged on the surface of the superconducting magnet made of a good conductor has a feature that the collected power is reduced by the effect of the eddy current generated on the surface of the cryogenic container. The point of design is to reduce it.

In view of this, an induction current collecting apparatus is known in which the current collecting coil is separated from the surface of the low temperature container so as not to be affected by the low temperature container eddy current (Non-Patent Document 1).
Murai, Hasegawa, Fujiwara, “Improvement of characteristics of induction current collector in side wall floating method”, IEEJ Transactions D, Vol. 117, No. 1, pp. 81-90 (1997)

  However, in the induction current collector described in Non-Patent Document 1, when the current collecting coil is configured as a one-layer coil in the thickness direction (in the normal direction of the cryogenic vessel surface), the thickness of the current collecting coil is increased. As shown in FIG. 7, there is a problem that the collected power cannot be increased because the collected power is reduced due to the influence of the eddy current of the cryogenic vessel.

  The present invention has been made to solve the above-described problems, and an object thereof is to provide a magnetic levitation moving apparatus capable of increasing the collected power.

  In order to achieve the above object, a magnetic levitation moving apparatus according to a first invention includes a cryocontainer formed of a conductor, a superconducting coil housed in the cryocontainer, and a first current collecting coil having a predetermined number of turns. A first coil group provided in a portion of the surface of the cryogenic vessel facing a ground coil installed on a side wall of a track on which the device moves, and a first coil connected in series. And a plurality of second current collecting coils having a number of turns larger than the predetermined number of turns, and including a second coil group provided on the ground coil side of the first coil group. Yes.

  According to the magnetic levitation moving apparatus according to the first aspect of the invention, the first current collecting coil and the second current collecting coil connected in series using the harmonic magnetic field generated by the ground coil installed on the side wall of the track. Electric power is collected by the electric coil. At this time, an eddy current is generated in the cryogenic vessel by the harmonic magnetic field generated by the ground coil, and the harmonic magnetic field to the first current collecting coil and the second current collecting coil is reduced. And the collected electric power by the 2nd current collection coil is reduced.

  In addition, an eddy current is generated in the low temperature container due to the magnetic field generated by the current flowing through the first current collecting coil and the second current collecting coil, and therefore a loss occurs for the first current collecting coil and the second current collecting coil. The apparent resistance of the first current collecting coil and the second current collecting coil is increased, and the collected power is decreased.

  Here, when the number of turns of the first current collecting coil is reduced and the turn ratio of the first current collecting coil and the second current collecting coil is changed, the first current collecting coil and the second current collecting coil are changed. Loss based on the eddy current generated by the current flowing through the current collecting coil is reduced, and an increase in apparent resistance of the first current collecting coil and the second current collecting coil is suppressed.

  Therefore, the first current collecting coil and the second current collecting coil provided on the ground coil side of the first current collecting coil collect power and reduce the number of turns of the second current collecting coil. By increasing the number of windings of the first current collecting coil, the current collecting power is increased in order to reduce the loss based on the eddy current generated by the current flowing through the first current collecting coil and the second current collecting coil. be able to.

  Further, the number of turns of the second current collecting coil according to the first invention is generated in the first current collecting coil and in the second current collecting coil by electromagnetic induction of the magnetic field generated by the ground coil. The number of turns can be increased to be equal to the current to be applied. Thereby, since the current collection capability by each of the 1st current collection coil and the 2nd current collection coil can be utilized to the maximum, current collection electric power can be increased further.

  Further, the position of the first current collecting coil according to the first invention and the position of the second current collecting coil connected in series to the first current collecting coil are shifted by a predetermined amount in the moving direction of the device itself. Can be configured. Thereby, since the position of the 1st current collection coil and the position of the 2nd current collection coil have shifted, it is based on the eddy current which the current which flows into the 1st current collection coil and the 2nd current collection coil generates. Loss can be reduced and the collected power can be further increased.

  Moreover, the 1st current collection coil which concerns on 1st invention is provided in the upper part of the surface of a cryogenic container, and a 2nd current collection coil is comprised so that a magnitude | size may become larger than a 1st current collection coil. be able to. Accordingly, since the first current collecting coil having a small size is provided on the upper portion of the surface of the cryogenic vessel, the first current collecting coil is based on the eddy current generated by the current flowing through the first current collecting coil and the second current collecting coil. Loss can be reduced and the collected power can be further increased.

  A magnetic levitation moving apparatus according to a second aspect of the present invention includes a low temperature container formed of a conductor, a superconducting coil housed in the low temperature container, and a plurality of first current collecting coils having a predetermined number of turns, A first coil group provided on a surface of the container facing a ground coil installed on a side wall of a trajectory on which the device moves, and a first coil group connected in series to the first current collecting coil; and A plurality of second current collecting coils provided at positions shifted by a predetermined amount in the moving direction of the current device with respect to the position of one current collecting coil, provided on the ground coil side of the first coil group; And the second coil group.

  According to the magnetic levitation moving apparatus according to the second invention, the first current collecting coil and the second current collecting coil connected in series by using the harmonic magnetic field generated by the ground coil installed on the side wall of the track. Electric power is collected by the electric coil. At this time, an eddy current is generated in the cryogenic vessel by the harmonic magnetic field generated by the ground coil, and the harmonic magnetic field to the first current collecting coil and the second current collecting coil is reduced. And the collected electric power by the 2nd current collection coil is reduced.

  In addition, an eddy current is generated in the low temperature container due to the magnetic field generated by the current flowing through the first current collecting coil and the second current collecting coil, and therefore a loss occurs for the first current collecting coil and the second current collecting coil. The apparent resistance of the first current collecting coil and the second current collecting coil is increased, and the collected power is decreased.

  Here, if the position of the first current collecting coil and the position of the second current collecting coil are shifted in the moving direction, the eddy current generated by the current flowing through the first current collecting coil and the second current collecting coil is changed. The loss based on it decreases and the increase in the apparent resistance of the 1st current collection coil and the 2nd current collection coil is controlled.

  Accordingly, power is collected by the first current collecting coil and the second current collecting coil provided on the ground coil side of the first current collecting coil, and the position of the first current collecting coil and the second current collecting coil are By shifting the position of the two current collecting coils in the moving direction, the current collected power is increased in order to reduce the loss due to the eddy current generated by the current flowing through the first current collecting coil and the second current collecting coil. Can be made.

  Moreover, the 1st current collection coil which concerns on 2nd invention is provided in the upper part of the surface of a cryogenic container, and a 2nd current collection coil is comprised so that a magnitude | size may become larger than the said 1st current collection coil. can do. Accordingly, since the first current collecting coil having a small size is provided on the upper portion of the surface of the cryogenic vessel, the first current collecting coil is based on the eddy current generated by the current flowing through the first current collecting coil and the second current collecting coil. Loss can be reduced and the collected power can be further increased.

  According to a third aspect of the present invention, there is provided a magnetic levitation moving apparatus comprising a plurality of low-temperature containers made of a conductor, a superconducting coil housed in the low-temperature container, and a first current collecting coil having a predetermined number of turns. A first coil group provided on a portion of the upper surface of the container and facing a ground coil installed on a side wall of a trajectory on which the device moves, and the first current collecting coil connected in series A plurality of second current collecting coils having a larger size than the first current collecting coil, and a second coil group provided on the ground coil side of the first coil group. It is configured.

  According to the magnetic levitation moving apparatus according to the third aspect of the present invention, the first current collecting coil and the second current collecting coil connected in series using the harmonic magnetic field generated by the ground coil installed on the side wall of the track. Electric power is collected by the electric coil. Moreover, an eddy current is generated in the cryogenic vessel by the harmonic magnetic field generated by the ground coil, the harmonic magnetic field to the first current collecting coil and the second current collecting coil is reduced, and the first current collecting coil and The power collected by the second current collecting coil is reduced. In addition, an eddy current is generated in the low temperature container due to the magnetic field generated by the current flowing through the first current collecting coil and the second current collecting coil, so that the first current collecting coil and the second current collecting coil are lost. The apparent resistance of the first current collecting coil and the second current collecting coil is increased, and the collected power is decreased.

  Here, when the size of the first current collecting coil is made smaller than that of the second current collecting coil and provided on the upper portion of the surface of the cryogenic vessel, the first current collecting coil flows through the first current collecting coil and the second current collecting coil. Loss based on the eddy current generated by the current is reduced, and an increase in apparent resistance of the first current collecting coil and the second current collecting coil is suppressed.

  Therefore, the first current collecting coil and the second current collecting coil provided on the ground coil side of the first current collecting coil collect power and the first current collecting coil having a small size. To reduce the loss due to eddy currents generated by the currents flowing in the first current collecting coil and the second current collecting coil, thereby increasing the current collecting power. it can.

  As described above, according to the magnetic levitation moving apparatus of the present invention, electric power is generated by the first current collecting coil and the second current collecting coil provided on the ground coil side of the first current collecting coil. By collecting current and making the number of turns of the second current collecting coil larger than the number of turns of the first current collecting coil, or the position of the first current collecting coil and the position of the second current collecting coil By moving the first current collecting coil in the moving direction or by providing the first current collecting coil having a small size on the upper surface of the cryogenic container, the current flowing through the first current collecting coil and the second current collecting coil can be reduced. Since the loss based on the eddy current to be generated is reduced, it is possible to increase the collected power.

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

  As shown in FIG. 1, the magnetic levitation moving system 10 according to the first embodiment includes a vehicle 12 and a track 14 having a U-shaped cross section.

  Superconducting magnet cryogenic container 16 made of a good conductor such as aluminum is provided on both lower side surfaces corresponding to the carriage of vehicle 12, and superconducting coil 18 is accommodated in superconducting magnet cryogenic container 16.

  In addition, the surface of the superconducting magnet cryogenic vessel 16 is provided with a current collecting coil unit 20 in which a plurality of current collecting coils are arranged in the traveling direction, and the current collecting coil unit 20 is in a steady traveling state of the vehicle 12. It arrange | positions so that the ground coil mentioned later may be opposed.

  Further, the vehicle 12 is supplied with a PWM (pulse width modulation) converter 22 for rectifying the induced alternating current induced in the current collecting coil unit 20 and a load 24 supplied with the current rectified via the PWM converter 22. And are provided. Further, a storage battery 26 is provided that is charged by the current rectified by the PWM converter 22.

  Further, a propulsion ground coil (not shown) that generates a moving magnetic field is provided on the inner surface of the side wall of the track 14, and a levitation ground coil 30 that is short-circuited in a figure 8 shape is provided inside the propulsion ground coil. These are arranged in the traveling direction of the vehicle 12 so as to face the superconducting coil 18.

  With the above configuration, the electromagnetic force that supports the vehicle 12 is generated by the interaction between the superconducting coil 18 and the fundamental wave component of the reaction magnetic field of the levitation ground coil 30 generated by the movement of the superconducting coil 18. In addition, the current collecting coil unit 20 on the vehicle 12 collects electric power using a harmonic component (hereinafter referred to as a harmonic magnetic field) of the reaction magnetic field of the levitation ground coil 30.

  In addition, the current collecting coil unit 20 is configured to form a three-phase circuit in the traveling direction of the vehicle 12, and since the current collecting coil unit 20 has a large inductance, a PWM converter 22 is used. The power factor is improved and the output is increased.

  As shown in FIG. 2, the current collecting coil section 20 is composed of two layers of coils, a front current collecting coil 20A provided on the levitation ground coil 30 side and a back current collecting coil 20B provided on the vehicle 12 side. Has been. Further, the front current collecting coil 20A and the back current collecting coil 20B are connected in series, and the number of turns of the front current collecting coil 20A is larger than the number of turns of the back current collecting coil 20B. Winding of the front current collecting coil 20A and the back current collecting coil 20B so that the current flowing in the front current collecting coil 20A by the electromagnetic induction of the harmonic magnetic field generated by the coil 30 is equal to the current flowing in the back current collecting coil 20B. The number has been adjusted. The current collecting coil unit 20 is configured by arranging a plurality of two-layer coils of a front current collecting coil 20 </ b> A and a back current collecting coil 20 </ b> B in the traveling direction of the vehicle 12.

  Next, FIG. 3 shows an analysis model of the traveling direction of the magnetic levitation moving system 10 according to the present embodiment. Assuming that the coil pitch τ1 of the levitation ground coil 30 is 1/3 of the pole pitch τ, the current collecting coil section 20 has a 6th harmonic wave generated by the fifth-order spatial harmonics out of the harmonic magnetic field generated by the fundamental current of the levitation ground coil 30. It is desirable to use the next time harmonic component, and the coil pitch τ2 of the current collecting coil unit 20 is 2τ / 15 or 4τ / 15.

  Next, the operation of the magnetic levitation moving system 10 according to the present embodiment will be described.

  First, when the vehicle 12 is driven by the propulsion ground coil and a relative speed is generated between the superconducting coil 18 and the levitation ground coil 30, an induced electromotive force is generated in the levitation ground coil 30 according to Lenz's law. For example, when the vehicle 12 is supported by wheels and the upper and lower centers of the magnetic flux of the superconducting coil 18 coincide with the upper and lower centers of the levitation ground coil 30, the levitation ground coil 30 short-circuited in the shape of figure 8 The electromotive force between the upper part and the lower part is offset, and no induced current flows through the levitation ground coil 30. However, for example, when the vehicle speed becomes sufficient to ascend and the wheel is pulled up, the vehicle 12 sinks, and the center of the magnetic flux of the superconducting coil 18 falls below the center of the levitation ground coil 30, the lower part of the levitation ground coil 30 is lowered. The induced electromotive force is superior to the induced electromotive force at the upper part, an induced current flows through the levitation ground coil 30, a magnetic field having a polarity that cancels the magnetic flux of the superconducting coil 18 is present at the lower part, and a magnetic field opposite thereto is present at the upper part. When the superconducting coil 18 is lifted up, a levitation force acts to make the center of the magnetic flux of the superconducting coil 18 coincide with the center of the ground coil 30 for levitation. This induced current, that is, the levitation force, increases according to the vertical distance between the superconducting coil 18 and the levitation ground coil 30 and also according to the front and rear relative speeds. For example, the superconducting coil at a relative speed of 500 km / h. When the center of 18 is lowered by 40 mm from the center of the ground coil 30 for levitation, the weight (cart load) of the vehicle 12 and the levitation force antagonize.

  In addition, as described above, the levitation ground coil 30 is discretely arranged along the traveling direction of the vehicle 12, so when looking at the magnetic field at one point on the lower side surface of the vehicle 12 where the superconducting coil 18 is installed. For example, at one point where the upper and lower positions are opposed to the upper part of the levitation ground coil 30, the vehicle 12 travels and the magnetic flux is most dense when the vehicle 12 is at a position facing the front and rear centers of the levitation ground coil 30. Thus, a harmonic component (harmonic magnetic field) in which the magnetic flux becomes coarse is generated when it is at a position opposite to the midpoint between the two levitation ground coils 30.

  Then, by utilizing the harmonic magnetic field generated by the levitation ground coil 30, an induction voltage is generated in the front current collecting coil 20 </ b> A and the back current collecting coil 20 </ b> B of the current collecting coil unit 20 by electromagnetic induction to collect power. To do. The collected power is supplied to the load or supplied to the storage battery 26 via the PWM converter 22 to charge the storage battery 26. In the low speed range up to about 350 km / h, the collected power is supplied to the load 24 via the PWM converter 22 and also from the storage battery 26.

  Here, since the harmonic magnetic field of the levitation ground coil 30 adversely affects the superconducting coil 18, the superconducting magnet cryogenic vessel 16 formed of a good conductor shields the harmonic magnetic field. Therefore, two types of eddy currents, which will be described later, are generated on the surface of the superconducting magnet cryocontainer 16 to reduce the harmonic magnetic field to the front current collecting coil 20A and the back current collecting coil 20B of the current collecting coil unit 20, thereby collecting current. Reduce power. One eddy current is an eddy current generated by the harmonic magnetic field generated by the levitation ground coil 30, and reduces the harmonic magnetic field to the current collecting coil unit 20 as well as the harmonic magnetic field to the superconducting coil 18. The collected power by 20A and the back collector coil 20B is reduced. Another eddy current is an eddy current generated by the magnetic field generated by the current flowing through the front current collecting coil 20A and the back current collecting coil 20B. Loss occurs due to this eddy current, and the apparent resistance of the current collecting coil unit 20 (Equivalent resistance) is increased, and the collected power by the front collector coil 20A and the back collector coil 20B is reduced.

  Further, the current collecting coil portion installed on the surface of the superconducting magnet cryogenic vessel 16 is composed of two layers of a front current collecting coil on the levitation ground coil 30 side and a back current collecting coil on the vehicle 12 side, When the coils in each layer are collected by separate circuits, the back current collecting coil also obtains about half the current collected from the front current collecting coil. However, if the number of turns of the two coils is the same and simply connected in series, the collected power is not the sum of when the coils are configured as separate circuits, but is smaller than the sum of the power.

  On the other hand, based on the same concept as impedance matching used in a generator or the like, both coils so that the currents flowing in the front collector coil 20A and the back collector coil 20B are the same as in this embodiment. When the number of turns is adjusted, it is the sum of the power collected when configured as the separate circuits described above.

Next, the principle of the first embodiment will be described using simple numerical examples. Table 1 shows an example of the induced voltage, resistance, current, and collected power when the current collecting coil section composed of the two layers of the front current collecting coil and the back current collecting coil is formed as a separate circuit. In FIG. 2, the combined thickness Db of the front current collecting coil 20A and the back current collecting coil 20B is 30 mm, the width Dw is 130 mm, the height H0 is 400 mm, and the number of coils is 15. Further, the current and the collected power are obtained from the induced voltage and the resistance as follows.
(Current) = (Inductive voltage) / (Resistance) / 2
(Collector power) = (Induction voltage) ² / (Resistance) / 4 * (Number of coils)

As shown in Table 1, although it is as small as about 40% of the front collector coil, the collected power is obtained by the back collector coil. The collected power of the front collector coil and the collected current of the back collector coil are And the total value becomes 87.4 kW. The current of the front current collecting coil having a large current collecting power is about 1.8 times larger than the current of the back current collecting coil. At this time, in order to make the currents of the front and back current collecting coils the same, the number of turns of the front current collecting coil needs to be 1.8 times that of the back current collecting coil. When the front current collecting coil and the back current collecting coil are connected in series, the induced voltage and the resistance are the sum of both coils, and the current and the collected power are obtained using the above-described equations. Actually, since it is necessary to include a loss due to the eddy current generated by the current in the current collecting coil section, the resistance increases by a value corresponding to the loss, but here the principle is explained with a simplified example Therefore, the increment is omitted.

When the front current collecting coil and the back current collecting coil having the same number of turns are connected in series, and when the front current collecting coil and the back current collecting coil having the same number of turns are connected in series, the induced voltage, Examples of resistance, current, and collected power are shown in Table 1 above. As shown in Table 1, the collected power when the front current collecting coil and the back current collecting coil having the number of turns adjusted to have the same current are connected in series is the same as that of the front current collecting coil having the same number of turns. The increase is 8% when the back collector coil is connected in series. This value agrees with the sum of the collected power when the front and back current collecting coils are separate circuits. By adjusting the number of turns, the collected power increases and the current collecting capacity You can see that you are making the best use of.
In addition, as described above, the resistance in Table 1 above does not include an increase in consideration of loss due to eddy current in the superconducting magnet cryogenic vessel 16 that generates currents in the front collector coil and the back collector coil. Table 2 shows examples of the induced voltage, resistance, current, collected power, and apparent power when the loss is taken into account in the collecting coil unit 20 in the present embodiment. In addition, since the power converter capacity | capacitance which performs power factor control in order to obtain maximum electric power is proportional to this apparent power, a larger power converter is needed, so that apparent power is large.

  The induced voltage shown in Table 2 is the same as the value in Table 1. Compared with the example in Table 1, the resistance of “front current collecting coil (20 times) + back current collecting coil (20 times)” is 38.0 mΩ to 54.9 mΩ, and “surface current collecting coil (36 times) + back coil (20 times)” is increased from 77.1 mΩ to 107.5 mΩ. This is explained as follows.

Assuming that the eddy currents of the superconducting magnet cryogenic container generated by the currents of the front and back current collecting coils are a and b, the losses due to the eddy currents when the coils are energized are respectively a ² and b ² . Proportional and simple sum of both is a ² + b ² . On the other hand, since the loss due to the eddy current when the two coils are energized is proportional to (a + b) ² , the loss due to the eddy current when both the coils are energized is the eddy generated by the currents of the front and back current collecting coils. It increases by 2ab, which is a cross term of the expression representing the loss due to current. Since the cross term 2ab also changes depending on the ratio of the number of turns of the front current collecting coil and the back current collecting coil, the number of turns of the front current collecting coil is increased as “front current collecting coil (36 times) + back current collecting The resistance increase rate of the “electric coil (20 times)” (value in Table 2 / value in Table 1) is the same as the number of turns “front current collecting coil (20 times) + back current collecting coil (20 times)”. The resistance increase rate becomes smaller. Therefore, the collected power (see the lower part of Table 2) when the front current collecting coil and the back current collecting coil having the number of turns adjusted to have the same current are connected in series is the same as the current collected by the same number of turns. 12% increase in the case where the coil and the back collector coil are connected in series (hereinafter referred to as the conventional method, see the upper part of Table 2), and the characteristic improvement by adjusting the number of turns is even better than in Table 1. I understand.

  As described above, according to the magnetic levitation moving system according to the first embodiment, the power is collected by the front collector coil and the back collector coil connected in series, and the front collector coil By making the number of turns larger than the number of turns of the back current collecting coil, the loss due to the eddy current generated by the current flowing in the front current collecting coil and the back current collecting coil is reduced, so that the current collecting power can be increased. .

  Also, by reducing the number of turns of the back collector coil to less than the number of turns of the front collector coil so that the same current flows, the current collection capacity of each of the front collector coil and the back collector coil is maximized. Since the power can be saved, the collected power can be further increased.

  Next, a second embodiment will be described. In addition, about the part which becomes the structure similar to 1st Embodiment, the same code | symbol is attached | subjected and description is abbreviate | omitted.

  In the second embodiment, the size of the back current collecting coil is smaller than that of the front current collecting coil, and the back current collecting coil is concentrated on the upper part of the superconducting magnet cryogenic container. This is different from the embodiment.

  As shown in FIG. 4, the current collecting coil section 120 of the magnetic levitation moving system according to the second embodiment is composed of two layers of coils, a front current collecting coil 120A and a back current collecting coil 120B. The height of the coil 120B is lower than the height of the surface current collecting coil 120A.

  Here, the loss due to the eddy current of the superconducting magnet cryogenic vessel 16 generated by the currents collected by both the front current collecting coil 120A and the back current collecting coil 120B is due to the synergistic effect of the loss due to both eddy currents. More than the loss caused by the eddy current generated by the current of the current collector coil. For this reason, in the present embodiment, the height of the back current collecting coil 120B is lowered, and the back current collecting coil 120B is concentrated on the upper surface of the superconducting magnet cryogenic vessel 16 where eddy currents are difficult to occur. .

  By configuring the current collecting coil section 120 as described above, the synergistic effect of the loss caused by the eddy current generated by the current of the front current collecting coil 120A and the back current collecting coil 120B is reduced, and the surface current collecting coil 120A as a whole is reduced. Further, the loss due to the eddy current generated by the current of the current collecting coil 120B and the back current collecting coil 120B is reduced, so that the reduction of the current collecting power is suppressed, and as a result, the current collecting power by the front current collecting coil 120A and the back current collecting coil 120B is increased Let

  Next, the principle in the second embodiment will be described. Also in the magnetic levitation moving system according to the present embodiment, as in the first embodiment, the cross term 2ab of the expression representing the loss due to the eddy current generated by the front collector coil and the back collector coil is the current collector. Power will be reduced. Therefore, when the height of the back current collecting coil 120B is lowered and disposed on the upper surface of the superconducting magnet cryogenic container 16 as in the present embodiment, the back current collecting coil 120B has an area facing the superconducting magnet cryogenic container 16. Therefore, the loss due to the eddy current generated by the current of the back current collecting coil 120B is reduced, and the portion corresponding to the cross term 2ab in the equation representing the loss due to the eddy current is reduced to reduce the surface current collector. Loss due to eddy current generated by the current flowing through the coil 120A and the back collecting coil 120B can be reduced.

  Next, in the current collecting coil section 120 in the second embodiment, the thickness Db of the front current collecting coil 120A and the back current collecting coil 120B is 30 mm, the width Dw is 130 mm, and the height of the front current collecting coil 120A. Table 3 shows examples of induced voltage, resistance, collected power, and apparent power in a configuration in which H0 is 400 mm and the height Hi of the back collecting coil 120B is 135 mm.

  As shown in Table 3, the collected power (see the upper part of Table 3) when the height of the back current collecting coil is reduced is about 36% higher than that of the conventional method (see the upper part of Table 2).

  Further, similarly to the first embodiment, the number of turns of the front current collecting coil is set to be larger than the number of turns of the back current collecting coil so that the same current as that of the back current collecting coil flows. It can also be configured with a reduced coil height. In Table 3, in order to reduce the height of the back current collecting coil, the number of turns of the front current collecting coil from which the same current is obtained is different from that in Table 2 above, and the number of turns of the back current collecting coil is 1.2. It has doubled.

  In this case, the portion corresponding to the cross term 2ab in the expression representing the loss due to the eddy current described above can be further reduced. For example, compared with the conventional method (see the upper part of Table 2 above), In the configuration in which the number of turns of the coil is increased (see the lower part of Table 3), the increase is about 38%.

  As described above, according to the magnetic levitation moving system according to the second embodiment, the power is collected by the front current collecting coil and the back current collecting coil, and the back current collecting coil having a small size is arranged. By providing it on the upper surface of the superconducting magnet cryogenic vessel surface, the loss due to the eddy current generated by the current flowing through the front and back current collecting coils is reduced, so that the collected power can be increased.

  Further, when the number of turns of the front current collecting coil is set to be larger than the number of turns of the back current collecting coil, the loss due to the eddy current generated by the current flowing through the front current collecting coil and the back current collecting coil is determined. Therefore, the collected power can be further increased.

  Next, a third embodiment will be described. In addition, about the part which has the same structure as 1st Embodiment, the same code | symbol is attached | subjected and description is abbreviate | omitted.

  The third embodiment is different from the first embodiment in that the position of the front current collecting coil and the position of the back current collecting coil in the current collecting coil portion are shifted in the traveling direction of the vehicle 12. .

  As shown in FIG. 5, the current collecting coil unit 220 of the magnetic levitation moving system according to the third embodiment is configured by arranging a plurality of two-layer coils of a front current collecting coil 220 </ b> A and a back current collecting coil 220 </ b> B. The position of the front current collecting coil 220A and the position of the back current collecting coil 220B connected in series with the front current collecting coil 220A are arranged so as to be shifted by a half coil pitch in the traveling direction of the vehicle 12. Yes.

  Here, the loss due to the eddy current in the superconducting magnet cryogenic vessel 16 generated by the currents collected by both the front current collecting coil 220A and the back current collecting coil 220B is due to the synergistic effect of the loss due to both eddy currents. More than the loss caused by the eddy current generated by the current of the current collector coil. Therefore, in the present embodiment, the position of the front current collecting coil 220A and the position of the back current collecting coil 220B are shifted from each other in the traveling direction.

  By configuring as described above, the synergistic effect of loss due to eddy current generated by the currents of the front current collecting coil 220A and the back current collecting coil 220B is reduced, and the front current collecting coil 220A and the back current collecting coil 220B as a whole are reduced. Loss due to the eddy current generated by the current is reduced, and the reduction of the collected power is suppressed, and as a result, the collected power by the front collecting coil 220A and the back collecting coil 220B is increased. Yes. Further, since the reactance of the current collecting coil unit 220 can be reduced, the capacity of the power converter connected to the current collecting coil unit 220 is not increased.

  Next, the principle in the third embodiment will be described. Similar to the first embodiment, the cross term 2ab in the equation representing the loss due to the eddy current generated by the front and back current collecting coils reduces the collected power. Therefore, as in the present embodiment, when the back current collecting coil 220B is shifted from the front current collecting coil 220A by a half coil pitch, the flow path of the eddy current generated from the current of the back current collecting coil 220B and the front current collecting coil are arranged. Since the flow path of the eddy current generated by the current of the coil 220A is different, the synergistic effect of the loss due to the eddy current can be reduced, and the cross term of the expression representing the loss due to the eddy current can be reduced. .

  Next, in the current collecting coil section 220 in the present embodiment, the combined thickness Db of the front current collecting coil 220A and the back current collecting coil 220B is 30 mm, the width Dw is 130 mm, and the height H0 of the front current collecting coil 120A is Table 4 shows examples of induced voltage, resistance, collected power, and apparent power in the configuration of 400 mm.

As shown in Table 4, the collected power when the back current collecting coil is shifted by a half coil pitch is compared with the conventional method (see the upper part of Table 2 above) when it is composed of coils with the same number of turns (Table (See the upper part of 4).
In addition, regarding the apparent power, when the height of the back current collecting coil is reduced (see Table 3) as described in the second embodiment, it is more than twice the conventional method (see the upper part of Table 2). However, when the back collector coil is shifted by a half coil pitch (see Table 4), it does not have to be so large in proportion to the increasing rate of the collected power. Therefore, a very large power converter is not required.

  Further, similarly to the first embodiment, the number of turns of the front current collecting coil is set to be larger than the number of turns of the back current collecting coil so that the same current as that of the back current collecting coil flows. When the coil is shifted by a half-coil pitch, the cross term in the expression representing the loss due to the eddy current described above can be further reduced, and the collected power can be increased. For example, compared with the conventional method (see the upper part of Table 2 above), the configuration (see the lower part of Table 4) increases about 53% in the configuration in which the number of turns of the front current collecting coil is increased.

  As described above, according to the magnetic levitation moving system according to the third embodiment, the power is collected by the front current collecting coil and the back current collecting coil, and the position and the back current collecting position of the front current collecting coil are collected. By shifting the position of the electric coil in the traveling direction of the vehicle, the loss based on the eddy current generated by the current flowing through the front and back current collecting coils is reduced, so that the collected power can be increased.

  Further, when the number of turns of the front current collecting coil is set to be larger than the number of turns of the back current collecting coil, the loss due to the eddy current generated by the current flowing through the front current collecting coil and the back current collecting coil is determined. Therefore, the collected power can be further increased.

  Next, a fourth embodiment will be described. In addition, about the part which has the same structure as 1st Embodiment, the same code | symbol is attached | subjected and description is abbreviate | omitted.

  In the fourth embodiment, the size of the back current collecting coil is smaller than that of the front current collecting coil, and the back current collecting coil is concentrated on the upper part of the superconducting magnet cryogenic vessel, The difference from the first embodiment is that the position of the front current collecting coil and the position of the back current collecting coil in the electric coil section are shifted in the traveling direction of the vehicle.

  As shown in FIG. 6, the current collecting coil unit 320 of the magnetic levitation moving system according to the fourth embodiment has a plurality of two layers of coils, a front current collecting coil 320A and a back current collecting coil 320B, arranged in the traveling direction. The position of the front current collecting coil 320 </ b> A and the position of the back current collecting coil 320 </ b> B connected in series with the front current collecting coil 320 </ b> A are shifted by a half coil pitch in the traveling direction of the vehicle 12.

  Further, the height of the back current collecting coil 320B is lower than the height of the front current collecting coil 320A.

  Moreover, the loss due to the eddy current of the superconducting magnet cryogenic vessel 16 generated by the currents collected by both the front current collecting coil 320A and the back current collecting coil 320B, More than the loss due to the eddy current generated by the current of the current collecting coil. Therefore, in the present embodiment, the position of the front current collecting coil 320A and the position of the back current collecting coil 320B are shifted in the traveling direction, the height of the back current collecting coil 320B is reduced, and the superconducting magnet The back collecting coil 320B is arranged in a concentrated manner on the surface of the cryogenic vessel 16 where eddy currents are less likely to occur.

  By configuring in this way, the back current collecting coil 320B is shifted from the front current collecting coil 320A by a half coil pitch, so that the flow path of the eddy current generated from the current of the back current collecting coil 320B and the front current collecting coil are arranged. The flow path of the eddy current generated by the current of 320A is different, and the back current collecting coil 320B is concentrated on the upper surface of the superconducting magnet cryogenic vessel 16, so that the back current collecting coil 320B is a superconducting magnet. The area facing the cryogenic vessel 16 is reduced, and loss due to eddy current generated by the current of the back collector coil 320B is reduced. Therefore, the synergistic effect of the loss due to the eddy current generated by the currents of the front current collecting coil 320A and the back current collecting coil 320B is reduced, and the eddy currents generated as a whole by the currents of the front current collecting coil 320A and the back current collecting coil 320B. As a result, the reduction of the collected power is suppressed, and as a result, the collected power by the front collecting coil 320A and the back collecting coil 320B is increased.

  Thus, as in the first embodiment, the portion corresponding to the cross term 2ab in the expression representing the loss due to the eddy current generated by the currents of the front collector coil and the back collector coil can be reduced. Then, the reduction of the collected power is suppressed, and the collected power by the collecting coil unit 320 is increased.

  Next, in the current collecting coil section 320 according to the fourth embodiment, the combined thickness Db of the front current collecting coil 320A and the back current collecting coil 320B is 30 mm, the width Dw is 130 mm, and the height of the front current collecting coil 320A. Table 5 shows examples of induced voltage, resistance, collected power, and apparent power in a configuration in which the height H0 is 400 mm and the height Hi of the back current collecting coil 320B is 135 mm. In order to reduce the height of the back current collecting coil, the number of front coil turns for obtaining the same current is different from that in Table 2 above, as in the second embodiment. It has doubled.

  As shown in Table 5, the collected power (see the upper part of Table 5) when the height of the back current collecting coil is lowered and the position of the back current collecting coil is shifted by a half coil pitch is the conventional method (Table 2). This is an increase of about 36%.

  Further, as in the first embodiment, the number of turns of the front current collecting coil is set to be larger than the number of turns of the back current collecting coil so that the same current as that of the back current collecting coil flows. If the position of the back current collecting coil is shifted by a half coil pitch and the back current collecting coil having a reduced height is arranged on the upper surface of the superconducting magnet cryogenic vessel, the vortex mentioned above is used. The cross term of the expression representing the loss due to current can be further reduced. For example, a configuration (lower part of Table 5) in which the number of turns of the front current collecting coil is increased as compared with the conventional method (see the upper part of Table 2 above). )), The increase is about 36%.

  As described above, according to the magnetic levitation moving system according to the fourth embodiment, power is collected by the front current collecting coil and the back current collecting coil, and the back current collecting coil having a small size is arranged. Current flowing in the front and back current collecting coils by shifting the position of the front current collecting coil and the position of the back current collecting coil in the traveling direction of the vehicle. The collected power can be increased because the loss due to the eddy current generated by is reduced.

  Further, when the number of turns of the front current collecting coil is set to be larger than the number of turns of the back current collecting coil, the loss due to the eddy current generated by the current flowing through the front current collecting coil and the back current collecting coil is determined. Therefore, the collected power can be further increased.

It is sectional drawing which shows the structure of the magnetic levitation moving system which concerns on the 1st Embodiment of this invention. It is sectional drawing which shows the structure of the current collection coil part of the magnetic levitation system which concerns on the 1st Embodiment of this invention. It is a figure which shows the analysis model of the running direction of the magnetic levitation moving system which concerns on the 1st Embodiment of this invention. It is sectional drawing which shows the structure of the current collection coil part of the magnetic levitation system which concerns on the 2nd Embodiment of this invention. It is a perspective view which shows the structure of the current collection coil part of the magnetic levitation system which concerns on the 3rd Embodiment of this invention. It is a perspective view which shows the structure of the current collection coil part of the magnetic levitation system which concerns on the 4th Embodiment of this invention. It is a graph which shows the relationship between the coil cross-sectional thickness and current collection electric power in a prior art example.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Magnetic levitation movement system 12 Vehicle 14 Track 16 Superconducting magnet cryogenic container 18 Superconducting coil 20, 120, 220, 320 Current collecting coil part 20A, 120A, 220A, 320A Front current collecting coil 20B, 120B, 220B, 320B Back surface current collecting coil 22 PWM converter 24 Load 26 Storage battery 30 Levitation ground coil

Claims (7)

A cryogenic container formed of a conductor;
A superconducting coil housed in the cryogenic vessel;
A first coil group provided with a plurality of first current collecting coils having a predetermined number of turns, provided on a portion of the surface of the cryogenic vessel facing a ground coil installed on a side wall of a track on which the device moves;
A second current collector coil connected in series to the first current collecting coil and having a plurality of second current collecting coils having a number of turns larger than the predetermined number of turns, provided on the ground coil side of the first coil group. Coil groups of
Magnetic levitating and moving device.   The number of windings of the second current collecting coil includes a current generated in the first current collecting coil and a current generated in the second current collecting coil due to electromagnetic induction of a magnetic field generated by the ground coil. The magnetic levitation moving apparatus according to claim 1, wherein the number of turns is greater than the predetermined number of turns so as to be equal.   The position of the said 1st current collection coil and the position of the 2nd current collection coil connected in series with this 1st current collection coil have shifted | deviated predetermined amount in the moving direction of the own apparatus. The magnetic levitation moving apparatus as described. The first current collecting coil is provided on an upper surface of the cryogenic container,
The magnetic levitation moving apparatus according to any one of claims 1 to 3, wherein the second current collecting coil is larger in size than the first current collecting coil. A cryogenic container formed of a conductor;
A superconducting coil housed in the cryogenic vessel;
A first coil group provided with a plurality of first current collecting coils having a predetermined number of turns, provided on a portion of the surface of the cryogenic vessel facing a ground coil installed on a side wall of a track on which the device moves;
A plurality of second current collecting coils connected in series to the first current collecting coil and provided at a position shifted by a predetermined amount in the moving direction of the device relative to the position of the first current collecting coil. A second coil group provided on the ground coil side of the first coil group;
Magnetic levitating and moving device. The first current collecting coil is provided on an upper surface of the cryogenic container,
The magnetic levitation moving apparatus according to claim 5, wherein the second current collecting coil is larger in size than the first current collecting coil. A cryogenic container formed of a conductor;
A superconducting coil housed in the cryogenic vessel;
A plurality of first current collecting coils having a predetermined number of turns are provided on the surface of the cryogenic vessel and provided on a portion facing the ground coil installed on the side wall of the track on which the device moves. One coil group;
A plurality of second current collecting coils connected in series to the first current collecting coil and larger in size than the first current collecting coil, and provided on the ground coil side of the first coil group. A second coil group,
Magnetic levitating and moving device.

Images