JPH11150801A - Main circuit equipment for electric railcar - Google Patents

Abstract

PROBLEM TO BE SOLVED: To permit operation of an inverter by supplying power to a main circuit of an electric railcer during power failure, by operating transfer means through a power failure detecting device equipment with a timer, and boosting a low voltage power supply installed in the electric railcar with an emergency power supply equipment. SOLUTION: If a power failure detecting device 2 having a timer has detected a power failure for a duration longer than an AC-AC section passing time, then an automatic transfer device 3 is operated and an emergency power supply equipment 3 and a resistor 4 are connected to a main circuit of an electric railcar. Then, an inverter 5 is driven by a power supply from an emergency power supply equipment 1. The inverter 5 supplies an exciting current to a main motor 6 for a short period of time, thereby operating the main motor 6 as an induction generator. The main motor 6 supplies power as an induction generator to an inverter 5. The inverter 5 controls the main motor 6, which operates as an induction generator, in order to avoid an excessive braking force and slippage of wheels on the rail by consuming the generated power in the resistor 4, thereby creating an electric braking action.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric vehicle main circuit device for operating an electric brake when a power failure occurs. In particular, when a power outage occurs, only the mechanical brakes operate, and the electric brakes do not operate.In the event of a disaster such as an earthquake, the electric car main circuit that stops the electric car as quickly as possible and minimizes damage in the event of a disaster such as an earthquake. apparatus.

[0002]

2. Description of the Related Art In an electric vehicle, a braking force for stopping the electric vehicle in combination with an electric brake and a mechanical brake is normally secured. When the brake is applied as shown in FIG. 2, the inverter 5 controls the main motor 6 as an induction generator. The power output from the induction generator is converted to DC by the inverter 5,
The power is converted to single-phase AC by a converter and becomes higher than the overhead line voltage, and power is supplied to the overhead line to perform regenerative braking. When a power failure occurs, the converter and the inverter stop their operations, and no exciting current is supplied to the main motor 6 and the main motor 6 does not function as an induction generator. Therefore, the electric brake does not operate and the electric vehicle is stopped only by the mechanical brake. Was.

[0003]

According to the prior art,
At the time of a power failure, there was a problem that the electric brake did not operate and only the mechanical brake was used. The present invention has been made in order to solve the above-described problems, and it is an object of the present invention to provide a system that operates an electric brake that generates a controlled braking force so that wheels do not slide on rails even during a power failure. Aim.

[0004]

The electric vehicle main circuit device of the present invention is a device for generating a controlled electric brake in the event of a power failure; the electric vehicle main circuit device comprises an emergency power supply device, a power failure detector with a timer, , Switching means, and a resistor. When the power failure detector with the timer detects a power failure continuously for a certain period of time, the emergency power supply device is operated by the switching means to drive an inverter, and an exciting current is supplied. The main motor
(Three-phase induction motor) to make the main motor a generator,
The resistor operates the electric brake by consuming the electric power generated by the generator.

The term "emergency power supply device" used herein refers to any device that boosts a DC power supply voltage, such as a DC chopper, in addition to an independent power generation device such as a gas turbine power generation device.

[0006]

[Operation] The electric vehicle main circuit device of the present invention operates as follows. In the event of a power failure, the switching means is operated by a power failure detection device with a timer, the low-voltage power supply mounted on the electric vehicle is boosted by the emergency power supply device, and power is supplied to the electric vehicle main circuit to operate the inverter. The inverter supplies the exciting current to the main motor for a short time to operate as an induction generator.
The inverter generates the braking force controlled so that the wheels do not slide on the rail by the excessive braking force, and stops the electric vehicle.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an electric vehicle main circuit device according to the present invention will be described in detail. FIG. 1 is a configuration diagram showing an embodiment of an electric vehicle main circuit device according to claim 1 of the present invention. Here, 1 is an emergency power supply device, 2 is a power failure detector with a timer, 3 is an automatic switching device, and 4 is a resistor.

An embodiment of an electric vehicle main circuit device according to claim 1 of the present invention will be described with reference to FIG. The electric vehicle main circuit device according to claim 1 of the present invention operates the automatic switching device 3 when the power failure detector with timer 2 detects a power failure for a time longer than the AC-AC section passing time in order to operate the electric brake at the time of power failure. The emergency power supply 1 is connected to the main circuit of the electric car. The resistor 4 is also connected to the main circuit. The connection between the capacitor 8 of the main circuit and the converter 9 is cut off. As a result, the main circuit is newly constituted by the main motor 6, the inverter 5, the emergency power supply 1, the capacitor 8, and the resistor 4. The inverter 5 is driven by the power supply from the emergency power supply device 1 that boosts the low voltage source. The inverter 5 supplies the exciting current to the main motor 6 for a short time, and operates the main motor 6 as an induction generator. The main motor 6 supplies power to the inverter 5 as an induction generator. The inverter 5 controls the main motor 3 serving as the induction generator so that the braking force becomes excessive and the wheels do not slide on the rail, and the generated power is consumed by the resistor 4 to operate the electric brake.

An embodiment of the emergency power supply device according to claim 2 of the present invention will be described with reference to FIG. The emergency power supply according to claim 2 of the present invention has a function of boosting a low-voltage power supply at the time of a power failure to secure a main circuit power supply for driving the inverter. This emergency power supply operates as follows. The low-voltage DC power supply of the storage battery 13 is converted into AC by the inverter 14, and the power rectified into DC by the rectifier 15 and boosted from the voltage of the storage battery is supplied to the main circuit. The capacitor 16 is for smoothing. In the above embodiment, the automatic switching device 3 has been described. However, if the automatic switching device does not operate sufficiently, the switching may be performed by operating a manual switch provided in the cab.

[0010]

According to the present invention, even if a power failure occurs in the event of an abnormality such as an earthquake, a controlled electric brake is operated to obtain a high-speed deceleration brake. In particular, for those traveling at high speeds such as Shinkansen trains, the mechanical brake alone has a problem with the heat capacity of the brake disc, and an electric brake is indispensable to shorten the braking distance.

[Brief description of the drawings]

FIG. 1 is a configuration diagram showing an embodiment of an electric vehicle main circuit device according to claim 1 of the present invention.

FIG. 2 is a configuration diagram showing an embodiment of the emergency power supply device according to claim 2 of the present invention.

FIG. 3 is an explanatory diagram of a conventional electric vehicle main circuit device.

[Explanation of symbols]

 Reference Signs List 1 emergency power supply device 2 power failure detector with timer 3 automatic switching device 4 resistor 5 inverter 6 main motor 4 resistor 7 diode 8 capacitor 9 converter 10 main transformer 11 pantograph 12 overhead wire 13 storage battery 14 inverter 15 rectifier 16 capacitor

Claims (2)

[Claims] 1. An electric vehicle main circuit device for operating an electric brake when a power failure occurs, said electric vehicle main circuit device comprising an emergency power supply device, a power failure detector with a timer, switching means, and a resistor. When the power failure detector with the timer detects a power failure continuously for a certain period of time, the switching unit activates the emergency power supply device to drive the inverter,
An electric vehicle which supplies an exciting current to a main motor (three-phase induction motor), turns the main motor into a generator, operates an electric brake, and the resistor consumes electric power generated by the generator. Circuit device. 2. The electric vehicle main circuit device according to claim 1, wherein the emergency power supply device according to claim 1 boosts a low-voltage power supply voltage.