JPS5843104A - Contactless current collector for floating railway train - Google Patents

Abstract

PURPOSE:To maintain the induced voltage of an induction coil provided for a train irrespective of the variation in the speed of the train by providing taps at the induction coil and switching the taps so that the output voltage becomes high at a low speed time and low at a high speed time. CONSTITUTION:In a superconductively magnetic linear motor car, induction coils 2, 3 are provided under a body 1 or under a side of the body, and a superconductive magnet 6 which generates a strong magnetic field is provided. On the other hand, a pair of ground coils of for floating and a pair of ground coils 8 for drive guide are provided at an orbit, and are respectively coupled to the magnet 6 and the coils 2, 3. A plurality of taps A-C are provided for the coils 2, 3, and a switch 10 which selects one of the taps A-C is provided, and a 3- phase full-wave rectifier 9 which forms part of a power converter 4 is connected to the output side of the switch 10, which is switched to automatically output the prescribed voltage in response to the induced voltage produced at the coils 2, 3. The prescribed voltage can be outputted irrespective of a train speed to a load 5 such as an air conditioner facility or an illumination facility or the like.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention is directed to a non-contact current collector for floating railways, and is particularly suitable for application to spatial harmonic current collectors attached to superconducting magnetically levitated railways. Relating to a contact current collector.

FIG. 1 shows an example of a superconducting magnetic levitation railway, that is, a superconducting magnetic linear motor car. A linear motor car is divided into a body part and a track part. The car body part (train part) includes an induction coil 2 J31 provided at the lower part of the car body 1 or the lower side of the car body 1, and a power converter 4 that converts the induced power from the induction coil 2 into DC power and performs predetermined control. , a load 5 supplied with power by the power converter 4
(on-vehicle air conditioning equipment, lighting equipment, etc.) is composed of a superconducting magnet 6 that receives electric power I#ia from a power converter 4 and generates a strong magnetic field. They are placed on both sides.In addition, the induction coils can be placed on either the sides or the bottom, but a pair is required (in order to keep the car body levitating in a well-balanced manner).

-P j1 orbit section j[t, provides a levitation blade to the superconducting magnet 6 provided in the body 1, and propels the pair of levitation ground coils 7 and the super t4i conductive coil 6 which induce AC power to the induction coil 2. A pair of ground coils 8 for propulsion and guidance are provided to apply force and to induce AC power to the induction coil 3 when the induction coil 3 is used without using the induction coil 2.

By the way, the spatial harmonic current collector as shown in FIG.
As shown in FIG. 2, the induced voltage has a characteristic that varies greatly depending on the train speed. Therefore, at maximum speed (for example, 5
If it is designed to have the optimum specifications at 00K [Il/h), the induced voltage will be low at low speeds (for example, 300K/h), resulting in insufficient power supply to the load. On the other hand, if it is designed to have optimal specifications at low speeds,
There was a drawback that the induced voltage was too high at the optimum speed, causing design problems (damage, etc.) to the load equipment.

SUMMARY OF THE INVENTION An object of the present invention is to provide a non-contact control device for a floating F type railway, which can keep the induced voltage constant regardless of changes in train speed.

The present invention provides a tap on the induction coil, and the tap is
The output voltage is switched so that the output voltage is high at low speeds and low at high speeds, so that the induced voltage remains constant regardless of the train speed.

The voltage induced in the induction coil 2 (or 3) changes as shown by the following equation.

XCo5 (3, n, ω@t+(3n-1)--X)
τ 3n , 3n-)1 πL3 n
++, Sin (□・−・λ)3n+1
2 τ However, N: Number of turns of the induction coil λ: Length of the induction coil in the traveling direction L3"+l t L3+++I", constant V: Train speed τ: Pole pitch Therefore, the number of series induction coils (in the 1st equation, the number of induction coils By increasing the number of turns (equivalent to the number of turns in the train) at low speeds and decreasing it at high speeds, the induced voltage can be kept constant regardless of the train speed.

FIG. 3 is a circuit diagram showing an embodiment of the present invention.

A plurality of taps A, B, and C are provided in the induction coil 2 (3),
A switch 10 for selecting one of these taps is provided,
Further, a three-phase full-wave rectifier 9 forming part of the power converter 4 is connected to the output side of the switch 10. The switch 10 is automatically switched to output a constant voltage according to the induced voltage generated in the induction coil 2 (3). Induction coil 2 (3)
The voltage induced between points N and A has a relationship with the speed as shown in FIG. 3. Therefore, the tap is changed from A to 1 according to the induced voltage, that is, as the induced voltage decreases.
By switching from 3 to C, a substantially constant output voltage can be obtained regardless of the train speed, as shown in FIG.

FIG. 5 is a circuit diagram showing another embodiment of the present invention. In this embodiment, the induction coil 2 (3) is an example of single-phase connection, and in addition to using a single-phase switching device 11 as a switching device, a single-phase rectifier 12 for single-phase use is connected to the telescope. is different from the implementation column in FIG. The output characteristics according to this embodiment are the same as those shown in FIG. 4, and the same effects as those shown in FIG. 3 can be obtained.

In each of the above embodiments, the case where the number of switching taps is three has been described, but the number can be set to f as many as necessary. Moreover, although the switching of the switching device is carried out according to the change in the induced voltage, the train speed may be detected and controlled in other ways.

As is clear from the above, according to the present invention, the induced voltage on the vehicle side can be kept constant regardless of the speed of 91 times.

[Brief explanation of the drawing]

Fig. 1 is a schematic diagram showing an example of a superconducting magnetic levitation railway, Fig. 2 is an induced voltage characteristic diagram of an induction coil, Fig. 3 is a circuit diagram showing the first embodiment of the present invention, and Fig. 4 is a diagram of the present invention. FIG. 5 is a diagram showing induced voltage characteristics of the induction coil according to the invention, and is a circuit diagram showing a second embodiment of the invention. 1... Vehicle body, 2.3... Induction coil, °4... Power converter, 5... Load, 6... Superconducting magnet, 7...
・Ground coil for levitation, 8...Ground coil for propulsion guide,
9...Sanwa full wave adjustment Figure 1 Figure 2 Party figure 3

Claims (1)

[Claims] 1, -4 Electric power is transferred from the ground coil installed on the ground side to the train side (
In the current collecting device, a plurality of taps are attached to the induction coil to change the output voltage of the induction coil, and a switching device that switches the taps in accordance with the speed of the train so that the output voltage is constant. 1. A non-protrusion system for a floating railway, characterized by comprising: