CA1190618A - Non-contact type power collecting device for magnetically levitated vehicle type railway transportation system - Google Patents
Non-contact type power collecting device for magnetically levitated vehicle type railway transportation systemInfo
- Publication number
- CA1190618A CA1190618A CA000413096A CA413096A CA1190618A CA 1190618 A CA1190618 A CA 1190618A CA 000413096 A CA000413096 A CA 000413096A CA 413096 A CA413096 A CA 413096A CA 1190618 A CA1190618 A CA 1190618A
- Authority
- CA
- Canada
- Prior art keywords
- power
- collecting
- coils
- induction coils
- collecting induction
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L2200/00—Type of vehicles
- B60L2200/26—Rail vehicles
Landscapes
- Control Of Vehicles With Linear Motors And Vehicles That Are Magnetically Levitated (AREA)
- Current-Collector Devices For Electrically Propelled Vehicles (AREA)
Abstract
ABSTRACT OF THE DISCLOSURE
In a magnetically levitated train, a non-contact type power collecting device utilizing the harmonics of reaction magnetic flux generated from levitation ground coils is provided for supplying required power to air-conditioning equipment, lighting equipment, etc. in the train. In such a device, a plurality of power-collecting induction coils are disposed on the train body opposite to the levitation ground coils, and the voltage induced in the power-collecting induction coils by the harmonic components of reaction magnetic flux generated from the levita-tion ground coils is applied to a power converter to supply required power to the air-conditioning equipment, lighting equipment, etc. According to the present invention, the individual power-collecting induction coils have different numbers of turns depending on the level of the voltage induced due to interlinkage of the space harmonics from the levitation ground coils with the power-collecting induction coils thereby to balance the weights of the individual power-collecting induction coils with their power collecting capabilities, so that power can be efficiently collected to be effectively supplied to the loads.
In a magnetically levitated train, a non-contact type power collecting device utilizing the harmonics of reaction magnetic flux generated from levitation ground coils is provided for supplying required power to air-conditioning equipment, lighting equipment, etc. in the train. In such a device, a plurality of power-collecting induction coils are disposed on the train body opposite to the levitation ground coils, and the voltage induced in the power-collecting induction coils by the harmonic components of reaction magnetic flux generated from the levita-tion ground coils is applied to a power converter to supply required power to the air-conditioning equipment, lighting equipment, etc. According to the present invention, the individual power-collecting induction coils have different numbers of turns depending on the level of the voltage induced due to interlinkage of the space harmonics from the levitation ground coils with the power-collecting induction coils thereby to balance the weights of the individual power-collecting induction coils with their power collecting capabilities, so that power can be efficiently collected to be effectively supplied to the loads.
Description
1 This invention relates to a non-contact type power collecting device for a magnetically levitated vehicle type railway transportation system, and more particularly to a device of the kind above described which is suitable for application to a space harmonic power collector provided in a magnetical-ly levitated vehicle type railway transportation system comprising superconducting magnets.
In a magnetically levitated vehicle type railway transportation system in which a train is run in a condition magnetically ievitated above the ground, superconducting magnets are.disposed on the train body, while ground coils for train levitating purpose are disposed on the ground opposite to the superconducting magnets, and the force of magnetic repulsion between the superconducting magnets and the levitation ground coils is utilized so as to propel the train at a very high speed in a condition levitating above the ground.
A problem inherent in such a magnetically levitated trai.n is how to secure a power source for supplying power to air-conditioning equipment, lighting equipment, etc. provided on the train. This is because the train runs at a very high speed, and it is therefore difficult to collect power by means such as ~ ,...
c)~
1 a pantograph collector generally used in a conven-tional train.
In an effort to solve such a problem, a non-contact type power collecting device utilizing higher harmonics of reaction magnetic flux generated from the levitation ground coils has been proposed so as to provide the desired power source on the train body. The propose device has such a construction that a plurality of power-collecting induction coils are disposed on the train body opposite to the levitation ground coils, and the voltage induced in the power-collecting induction coils by higher harmonic compo-nents (generally, sixth time harmonic) of reaction magnetic flux generated from the levitation ground coils is supplied through a power converter to the loads such as the lighting equipment and air-condition-ing equipment in the train. Although the space harmonic flux generated from the levitation ground coils makes interlinkage with the power-collecting induction coils, this space harmonic flux has different densities at various points along the advancing direction of the train. However, because of the fact that all of the power-collecting induction coils have the same number of turns, the weight of some of the power-collecting induction coils may be consider-ably large relative to the collected power, meaning that the reactance is large. Thérefore, the proposed device has been defective in that the required power Q~
1 cannot be collected with high efficiency.
More precisely, the voltage V induced in the power-collecting induction coils is represented by the sum of higher harmonics of a plurality of orders as shown in the equation (1). Therefore, the prior art device is unable to collect power with high efficiency, since all of the power-collecting induction coils have the same number of turns regardless of the fact that the induced voltage V per turn has dif-ferent values at various points along the advancingdirection of the train.
n-lN V[3n-1L3n lsin(3n2 l.~
x cos{3-n ~ t + (3n~ X}
3n 3n+1 3n+lL3n+lSln ( x cos{3-n-~-t + (3n+1) T-~}] (1) where N: Number of turns of the power-collecting induction coils ~: Length of the power-collecting induction coils in the train advancing direction L3n-l'L3n+1 Constan v: Train speed T: Pole pitch 1 Wlth a view to obviate the prior art defect, it is a primary object of the present invention to provide a non-contact type power collecting device for a magnetically levitated vehicle type railway transportation system, in which the individual power-collecting induction coils have their weights suitably balanced with their power collecting capabilities so as to ensure power collection with high efficiency.
The device according to the present inven-tion which attains the above object is featured by the fact that a plurality of power-collecting induction coils disposed on the body of a train opposite to levitation ground coils for collecting power have different num~ers of turns depending on the values of the voltage induced due to interlinkage of the power-collecting induction coils with the space harmonic flux generated from the levitation ground coils. More precisely, the present invention is featured by the fact that the power-collecting induc~
tion coils have an increased number of turns in the zone where the induced voltage per turn is relativ~ly high and a decreased number of turns in the zone where the induced voltage per turn is relatively low, so that the weights of the individual power-collecting induction coils can be balanced with their power collecting capabilities thereby ensuring power collec-tion with high efficiency.
The present inv~ntion will be apparent from 1 the following detailed descriptions taken in conjunction with the accompanying drawings, in which:
Fig. 1 shows schematically the coil arrange-ment in a very high speed, magnetically levitated S train provided with an embodiment of the non-contact type power collecting device according to the present invention;
Fig. 2 shows the arrangement of the power-col-lecting induction coils relative to the levitation ground coils in the embodiment of the present invention shown in Fig. l;
Figs. 3A to 3E show the voltage waveforms per turn induced in the individual power-collecting induction coils shown in Fig~ 2; and Fig. 4 is a graph showing the relation be-tween the train speed and the voltage induced in the power-collecting induction coils, for the purpose of comparison between the prior art device in which all o the power-collecting induction coils have the same number of turns and the device of the present invention in which the power-collecting induction coils have different numbers of turns.
The present invention will now be described in detail with reference to the drawings.
Fig. 1 shows schematically the coil arrange-ment in a very high speed, magnetically levitated train provided with an embodiment of the non-contact type power collecting device of the present invention 91~
1 which utilizes harmonics of reaction magnetic flu~
generated from levitation ground coils. Referring to Fig. 1, superconducting coils 2 disposed on the body 1 of the magnetically levitated train generate magnetic flux, and the magnetic flux generated from the superconducting coils 2 interact with current flowing through propulsion coils 4, guiding coils 5 and levitation ground coils 6 disposed on the ground 3 to produce propulsion rorce, guiding force (restoring force of lateral displacement) and levitating force.
A plurality of power-collecting induction coils 7 are disposed on the train body 1 opposite to the levitation ground coils 6, and the voltage induced in the power-collecting induction coils 7 by higher harmonic components (generally, sixth time harmonic) of reaction magnetic flux generated from the levita~ion ground coils 6 is applied to a power converter 8 which supplies required power to loads 9 such as fluorescent lamps and air conditioners in the train.
Fig. 2 shows the relative arrangement of the levitation ground coils 6 and the power-collecting induction coils 7. As shown in Fig. ~, three levita-tion ground coils 6 of U~ W and V phases respectively providing two poles are disposed opposite to a total of fifteen power-collecting induction coils 7 arranged in the order of R, S and T providing ten pol~s.
Figs. 3A to 3E show the waveforms of voltage ~()6~1~
1 induced in the respective power-collecting induction coils 11 to 15 arranged in the order shown in Fig. 2.
In Figs. 3A to 3E, the horizontal axis represents time T, and -the vertical axis represents induced voltage V to illustrate how the voltage V induced in each of the power-collecting induction coils 11 to 15 varies with time T. Thus, Figs. 3A, 3B, 3C, 3D
and 3E show the voltages V induced in the power-collecting induction coils with the same number of turns 11, 12, 13, 14 and 15 respectively. It will be seen from Figs. 3A to 3E that the value of the induced voltage V differs greatly depending on the position of the power-collecting induction coils 11 to 15. In the embodiment of the present invention, therefore, the number of turns of the power-collecting induction coils 11 and 12 having a relatively high voltage V
induced therein is selected to be more and that of the power-collecting induction coils 13 and 14 having a relatively low voltage V induced therein is selected to be less than -that of the power-collecting induction coil 15, in which an intermediate voltage V is induced and whose number of turns is the same as that of prior art power-collecting induction coils, so that power can be collected with high efficiency without changing the total weight of the power-collecting induction coils 7.
By so arranging the power-collecting induction coils 7, the individual power-collecting induction Q6~
1 coils 7 have weights well balanced with their power collecting capabilities and have numbers of turns effective for inducing the required voltage, so that the power-collecting induction coils can collect power quite efficiently regardless of the fact that the total weight is the same as that of the prior art ones.
Fig. 4 is a graph showing the relation between the train speed v and the total voltage V
induced in the power-collecting induction coils 7, for the purpose of comparison between the prior art device in which all of the power-collecting induction coils have ~he same number of turns and the device of the present invention in which the power-collecting induction coils have different numbers of turns. In Fig. 4, the horizontal axis represents the train speed v, and the vertical axis represents the induced voltage V.
The broken curve ~ in Fig. 4 indicates the induced voltage V relative to the train speed v in the case of the prior art device in which all of the power-collecting induction coils have the same n~ber of turns. In contrast, the solid curve Y in Fig. 4 indicates the induced voltage V per turn relative to the train speed v in the case of the device of the present invention in which the number of turns of the power-collecting induction coils is increased in the zone where the induced voltage V per turn is ~9v~
l relatively high, while it is decreased in the zone where the induced voltage V per turn is relatively low. Thus, it can be seen that, according to the present invention, more power can be collected in spite of the fact that the total weight of the power-collecting induction coils is the same as that of the prior art ones. For example, when the number of turns of the power-collecting induction coils 11 and 12 in Fig. 2 is increased by 50%, and that of ].0 the power-collecting induction coils 13 and 14 is decreased by 50% relative to that of ~he power-col-lecting induction coil 15, the amount of induced voltage V can be increased by about 13~ thereby cor-respondingly improving the efficiency although the total weight of the power-collecting induction coils is the same as that of the power-collecting induction coils in the prior art device.
It will be understood from the foregoing description that the non-contact type power collecting device for a magnetically levitated vehicle type railway transportation system according to the present invention is featured by the fact that a plurality of power-collecting induction coils disposed on the body of a train opposite to levitation ground coils for collecting power have different numbers of turns depending on the values of the voltage induced by lnterlinkage of the power-collecting induction coils with the space harmonic flux generated from the g ~o~
1 levitation ground coils. Therefore, the individual power-collecting induction coils have weights well balanced with their power collecting capabilities, and the non-contact type power collecting device of such a construction can collect power with high efficiency.
In a magnetically levitated vehicle type railway transportation system in which a train is run in a condition magnetically ievitated above the ground, superconducting magnets are.disposed on the train body, while ground coils for train levitating purpose are disposed on the ground opposite to the superconducting magnets, and the force of magnetic repulsion between the superconducting magnets and the levitation ground coils is utilized so as to propel the train at a very high speed in a condition levitating above the ground.
A problem inherent in such a magnetically levitated trai.n is how to secure a power source for supplying power to air-conditioning equipment, lighting equipment, etc. provided on the train. This is because the train runs at a very high speed, and it is therefore difficult to collect power by means such as ~ ,...
c)~
1 a pantograph collector generally used in a conven-tional train.
In an effort to solve such a problem, a non-contact type power collecting device utilizing higher harmonics of reaction magnetic flux generated from the levitation ground coils has been proposed so as to provide the desired power source on the train body. The propose device has such a construction that a plurality of power-collecting induction coils are disposed on the train body opposite to the levitation ground coils, and the voltage induced in the power-collecting induction coils by higher harmonic compo-nents (generally, sixth time harmonic) of reaction magnetic flux generated from the levitation ground coils is supplied through a power converter to the loads such as the lighting equipment and air-condition-ing equipment in the train. Although the space harmonic flux generated from the levitation ground coils makes interlinkage with the power-collecting induction coils, this space harmonic flux has different densities at various points along the advancing direction of the train. However, because of the fact that all of the power-collecting induction coils have the same number of turns, the weight of some of the power-collecting induction coils may be consider-ably large relative to the collected power, meaning that the reactance is large. Thérefore, the proposed device has been defective in that the required power Q~
1 cannot be collected with high efficiency.
More precisely, the voltage V induced in the power-collecting induction coils is represented by the sum of higher harmonics of a plurality of orders as shown in the equation (1). Therefore, the prior art device is unable to collect power with high efficiency, since all of the power-collecting induction coils have the same number of turns regardless of the fact that the induced voltage V per turn has dif-ferent values at various points along the advancingdirection of the train.
n-lN V[3n-1L3n lsin(3n2 l.~
x cos{3-n ~ t + (3n~ X}
3n 3n+1 3n+lL3n+lSln ( x cos{3-n-~-t + (3n+1) T-~}] (1) where N: Number of turns of the power-collecting induction coils ~: Length of the power-collecting induction coils in the train advancing direction L3n-l'L3n+1 Constan v: Train speed T: Pole pitch 1 Wlth a view to obviate the prior art defect, it is a primary object of the present invention to provide a non-contact type power collecting device for a magnetically levitated vehicle type railway transportation system, in which the individual power-collecting induction coils have their weights suitably balanced with their power collecting capabilities so as to ensure power collection with high efficiency.
The device according to the present inven-tion which attains the above object is featured by the fact that a plurality of power-collecting induction coils disposed on the body of a train opposite to levitation ground coils for collecting power have different num~ers of turns depending on the values of the voltage induced due to interlinkage of the power-collecting induction coils with the space harmonic flux generated from the levitation ground coils. More precisely, the present invention is featured by the fact that the power-collecting induc~
tion coils have an increased number of turns in the zone where the induced voltage per turn is relativ~ly high and a decreased number of turns in the zone where the induced voltage per turn is relatively low, so that the weights of the individual power-collecting induction coils can be balanced with their power collecting capabilities thereby ensuring power collec-tion with high efficiency.
The present inv~ntion will be apparent from 1 the following detailed descriptions taken in conjunction with the accompanying drawings, in which:
Fig. 1 shows schematically the coil arrange-ment in a very high speed, magnetically levitated S train provided with an embodiment of the non-contact type power collecting device according to the present invention;
Fig. 2 shows the arrangement of the power-col-lecting induction coils relative to the levitation ground coils in the embodiment of the present invention shown in Fig. l;
Figs. 3A to 3E show the voltage waveforms per turn induced in the individual power-collecting induction coils shown in Fig~ 2; and Fig. 4 is a graph showing the relation be-tween the train speed and the voltage induced in the power-collecting induction coils, for the purpose of comparison between the prior art device in which all o the power-collecting induction coils have the same number of turns and the device of the present invention in which the power-collecting induction coils have different numbers of turns.
The present invention will now be described in detail with reference to the drawings.
Fig. 1 shows schematically the coil arrange-ment in a very high speed, magnetically levitated train provided with an embodiment of the non-contact type power collecting device of the present invention 91~
1 which utilizes harmonics of reaction magnetic flu~
generated from levitation ground coils. Referring to Fig. 1, superconducting coils 2 disposed on the body 1 of the magnetically levitated train generate magnetic flux, and the magnetic flux generated from the superconducting coils 2 interact with current flowing through propulsion coils 4, guiding coils 5 and levitation ground coils 6 disposed on the ground 3 to produce propulsion rorce, guiding force (restoring force of lateral displacement) and levitating force.
A plurality of power-collecting induction coils 7 are disposed on the train body 1 opposite to the levitation ground coils 6, and the voltage induced in the power-collecting induction coils 7 by higher harmonic components (generally, sixth time harmonic) of reaction magnetic flux generated from the levita~ion ground coils 6 is applied to a power converter 8 which supplies required power to loads 9 such as fluorescent lamps and air conditioners in the train.
Fig. 2 shows the relative arrangement of the levitation ground coils 6 and the power-collecting induction coils 7. As shown in Fig. ~, three levita-tion ground coils 6 of U~ W and V phases respectively providing two poles are disposed opposite to a total of fifteen power-collecting induction coils 7 arranged in the order of R, S and T providing ten pol~s.
Figs. 3A to 3E show the waveforms of voltage ~()6~1~
1 induced in the respective power-collecting induction coils 11 to 15 arranged in the order shown in Fig. 2.
In Figs. 3A to 3E, the horizontal axis represents time T, and -the vertical axis represents induced voltage V to illustrate how the voltage V induced in each of the power-collecting induction coils 11 to 15 varies with time T. Thus, Figs. 3A, 3B, 3C, 3D
and 3E show the voltages V induced in the power-collecting induction coils with the same number of turns 11, 12, 13, 14 and 15 respectively. It will be seen from Figs. 3A to 3E that the value of the induced voltage V differs greatly depending on the position of the power-collecting induction coils 11 to 15. In the embodiment of the present invention, therefore, the number of turns of the power-collecting induction coils 11 and 12 having a relatively high voltage V
induced therein is selected to be more and that of the power-collecting induction coils 13 and 14 having a relatively low voltage V induced therein is selected to be less than -that of the power-collecting induction coil 15, in which an intermediate voltage V is induced and whose number of turns is the same as that of prior art power-collecting induction coils, so that power can be collected with high efficiency without changing the total weight of the power-collecting induction coils 7.
By so arranging the power-collecting induction coils 7, the individual power-collecting induction Q6~
1 coils 7 have weights well balanced with their power collecting capabilities and have numbers of turns effective for inducing the required voltage, so that the power-collecting induction coils can collect power quite efficiently regardless of the fact that the total weight is the same as that of the prior art ones.
Fig. 4 is a graph showing the relation between the train speed v and the total voltage V
induced in the power-collecting induction coils 7, for the purpose of comparison between the prior art device in which all of the power-collecting induction coils have ~he same number of turns and the device of the present invention in which the power-collecting induction coils have different numbers of turns. In Fig. 4, the horizontal axis represents the train speed v, and the vertical axis represents the induced voltage V.
The broken curve ~ in Fig. 4 indicates the induced voltage V relative to the train speed v in the case of the prior art device in which all of the power-collecting induction coils have the same n~ber of turns. In contrast, the solid curve Y in Fig. 4 indicates the induced voltage V per turn relative to the train speed v in the case of the device of the present invention in which the number of turns of the power-collecting induction coils is increased in the zone where the induced voltage V per turn is ~9v~
l relatively high, while it is decreased in the zone where the induced voltage V per turn is relatively low. Thus, it can be seen that, according to the present invention, more power can be collected in spite of the fact that the total weight of the power-collecting induction coils is the same as that of the prior art ones. For example, when the number of turns of the power-collecting induction coils 11 and 12 in Fig. 2 is increased by 50%, and that of ].0 the power-collecting induction coils 13 and 14 is decreased by 50% relative to that of ~he power-col-lecting induction coil 15, the amount of induced voltage V can be increased by about 13~ thereby cor-respondingly improving the efficiency although the total weight of the power-collecting induction coils is the same as that of the power-collecting induction coils in the prior art device.
It will be understood from the foregoing description that the non-contact type power collecting device for a magnetically levitated vehicle type railway transportation system according to the present invention is featured by the fact that a plurality of power-collecting induction coils disposed on the body of a train opposite to levitation ground coils for collecting power have different numbers of turns depending on the values of the voltage induced by lnterlinkage of the power-collecting induction coils with the space harmonic flux generated from the g ~o~
1 levitation ground coils. Therefore, the individual power-collecting induction coils have weights well balanced with their power collecting capabilities, and the non-contact type power collecting device of such a construction can collect power with high efficiency.
Claims (2)
1. A non-contact type power collecting device for a magnetically levitated vehicle type railway transportation system comprising a superconducting magnet disposed on the body of a train, levitation ground coils disposed on the ground opposite to said superconducting magnet, a plurality of power-collecting induction coils disposed on the outer surface of said superconducting magnet opposite to said levitation ground coils, the higher harmonics of magnetic flux generated from said levitation ground coils making interlinkage with said power-collecting induction coils to induce a voltage in each of said power-collecting induction coils, and means including a power converter for supplying power provided by the induced voltage to various loads in the train, said power-collecting induction coils having different numbers of turns depending on the level of the voltage per turn induced in each of said power-collecting induction coils.
2. A non-contact type power collecting device as claimed in Claim 1, wherein said power-collecting induction coils have an increased number of turns in the zone where the induced voltage per turn is relatively high and a decreased number of turns in the zone where the induced voltage is relatively low.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2081981A JPS56129946A (en) | 1980-02-13 | 1981-02-13 | Method for computing numerical value and numerical data processor |
| JP160208/1981 | 1981-10-09 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1190618A true CA1190618A (en) | 1985-07-16 |
Family
ID=12037635
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000413096A Expired CA1190618A (en) | 1981-02-13 | 1982-10-08 | Non-contact type power collecting device for magnetically levitated vehicle type railway transportation system |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA1190618A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8459188B2 (en) | 2004-03-19 | 2013-06-11 | Thyssenkrupp Transrapid Gmbh | Magnetic levitation train provided with a contactless inductive transmission device for a magnetic levitation vehicle railway |
-
1982
- 1982-10-08 CA CA000413096A patent/CA1190618A/en not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8459188B2 (en) | 2004-03-19 | 2013-06-11 | Thyssenkrupp Transrapid Gmbh | Magnetic levitation train provided with a contactless inductive transmission device for a magnetic levitation vehicle railway |
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