Rail vehicle traction system and rail vehicle

Abstract

The invention provides a railway vehicle traction system and a railway vehicle. The railway vehicle traction system comprises a permanent magnet synchronous generator, a traction converter and a permanent magnet synchronous motor. The permanent magnet synchronous generator is mechanically connected with an outer diesel engine and used for rotating under drive of the diesel engine so as to supply three-phase alternating current to the traction converter. The traction converter comprises a middle direct current circuit and a traction inversion circuit, the middle direct current circuit comprises a rectification and filter circuit, a grounding detection circuit and an input voltage and current detection circuit, all of which are sequentially and electrically connected, and the middle direct current circuit is used for supplying direct current voltage and protection to the traction inversion circuit; and the traction inversion circuit is electrically connected with the input voltage and current detection circuit and the permanent magnet synchronous motor and used for driving the permanent magnet synchronous motor, so that the permanent magnet synchronous motor drags the railway vehicle. Therefore, the efficiency of the whole traction system is improved, the installation space and the vehicle weight are reduced, and miniaturization, lightweight and low cost of the whole vehicle are achieved.

Description

technical field [0001] The invention relates to the technical field of rail vehicles, in particular to a rail vehicle traction system and a rail vehicle. Background technique [0002] The rail vehicle traction system is the power transmission system of the rail vehicle and is the core of the entire vehicle. [0003] The prior art rail vehicle traction system mainly includes: an AC synchronous generator, a traction converter and a DC motor which are electrically connected in sequence. The AC synchronous generator is connected with the external diesel engine, and the diesel engine drives the AC synchronous generator to generate three-phase alternating current, which supplies power for the traction converter, and drives the DC motor to rotate according to a certain law through the traction converter, so as to realize the traction of the rail vehicle. [0004] However, since the generator in the existing traction system uses an AC synchronous generator, the magnetic field of th...

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Problems solved by technology

[0004] However, since the generator in the existing traction system uses an AC synchronous generator, the magnetic field of the AC synchronous generator is generated by an external excitation current, so an additional excitation control device is required, resulting in a complex structure of the entire traction system and a large volume. Larger, leading to an increase in the installation space of the traction system, which increases the weight, energy consumption and cost of the rail vehicle

Moreover, the motor is a DC motor, and the brushes of the DC motor need to be maintained regularly, the maintenance cost is high, and the power loss caused by the mechanical friction of the brushes is large, resulting in a decrease in the efficiency of the entire traction system

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