Electrical generator or motor structure – Dynamoelectric – Linear
Reexamination Certificate
1999-04-12
2001-06-26
Mullins, Burton (Department: 2834)
Electrical generator or motor structure
Dynamoelectric
Linear
C310S013000, C104S288000, C104S290000, C104S292000
Reexamination Certificate
active
06252316
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a coil apparatus for a linear-motor railway system (magnetic levitation railway system).
2. Description of the Related Art
Conventional linear-motor railway systems have employed coil apparatuses of the following schemes in order to propel (P), levitate (L) and guide (G) railway vehicles.
Scheme (1): Propulsion/guide coils each providing propulsion and guide functions are disposed on opposite sidewalls of a guideway, and separate levitation coils are disposed on the bottom surface of the guideway.
Scheme (2): Separately from propulsion coils, levitation/guide coils each providing levitation and guide functions are disposed on opposite sidewalls of a guideway.
Scheme (3): Propulsion/levitation/guide coils each providing propulsion, levitation, and guide functions are disposed on opposite sidewalls of a guideway (hereinafter referred to as a “PLG scheme”).
An example arrangement of conventional coil apparatuses will be described.
FIG. 1
is a schematic diagram showing the arrangement of superconductive coils on a vehicle of a conventional linear-motor railway system, as well as the arrangement of ground coils on the ground.
FIG. 2
is a schematic diagram showing the arrangement of the superconductive coils on the vehicle of the conventional linear-motor railway system. Here, Scheme (2) is employed, in which, separately from propulsion coils, levitation/guide coils each providing levitation and guide functions are disposed on opposite sidewalls of a guideway.
In these drawings, reference numeral
100
denotes a vehicle of a linear-motor railway system (the length L
1
of the vehicle is 21.6 meters). Reference numeral
101
denotes a bogie for the vehicle (the length L
2
of the bogie is 5.4 meters). Reference numeral
102
denotes superconductive coils disposed on the bogie
101
. In this example, four superconductive coils
102
are mounted at a pitch of 1.35 meters such that N-poles and S-poles are formed alternately.
On the ground side, as shown in
FIG. 1
three-phase propulsion coils
111
are disposed to form two layers, and levitation/guide coils
112
are disposed at a pitch of 0.45 meter. The propulsion coils
111
and levitation/guide coils
112
form a ground coil
110
. Electric power is supplied to the propulsion coils
111
from a triple feeder circuit
120
.
In such a conventional scheme, since the propulsion coils
111
are independent of the levitation/guide coils
112
, the vehicle can be driven stably, and high reliability is attained in levitation and guide functions.
However, in the above-described conventional scheme as shown in
FIG. 1
, a large number of propulsion coils
111
and a large number of levitation/guide coils
112
per unit distance must be disposed on the ground. Therefore, the number of man-hour required for installation increases, and the number of connection points also increases, resulting in increased difficulty in inspection and maintenance of the contact points.
SUMMARY OF THE INVENTION
An object of the present invention is to solve the above-mentioned problems and to provide a coil apparatus for a linear-motor railway system, in which the number of ground coils can be decreased in order to decrease the number of man-hours required for installation, as well as to facilitate inspection and maintenance of contact points through reduction in the number of the connection points.
To achieve the above object, the present invention provides a coil apparatus for a linear-motor railway system which comprises six superconductive coils mounted on a bogie of a vehicle at a predetermined pitch such that N and S poles are alternately formed; ground coils disposed on either sidewall of a guideway, each of the ground coils providing propulsion, levitation, and guide functions, and each set of three ground coils corresponding to a pair of adjacent superconductive coils that form N and S poles; and a feeder circuit connected to the ground coils.
The predetermined pitch of the superconductive coils may be about 0.9 meter, and the pitch of the ground coils may be about 0.6 meter. The bogie may have a length of about 5.4 meters or about 8.1 meters. The feeder circuit may be a quadruple feeder circuit.
REFERENCES:
patent: 3890906 (1975-06-01), Maki
patent: 4913059 (1990-04-01), Fujie
patent: 5189961 (1993-03-01), Fujie
patent: 5213047 (1993-05-01), Fujiwara et al.
patent: 5293824 (1994-03-01), Fujie
patent: 5361707 (1994-11-01), Fujie
patent: 5586504 (1996-12-01), He et al.
Yamaguchi, LD-89-27 “Propulsion Ground-Coil Arrangement and Electromagnetic Force Fluctuation of Superconductive Magnetic Levitation Car.”, Oct. 1989.
Lorusso & Loud
Mullins Burton
Takaoka Electric Mfg. Co., Ltd.
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