An operational mechanical device and its electrical system

Abstract

The invention discloses an electric system. The electric system comprises a traction inverter and a traction motor, wherein the traction inverter is used for acquiring direct current from a power supply device through a direct-current bus, and the direct current is converted into three-phase alternating current which is supplied to the traction motor. On the basis, the invention also provides mechanical equipment capable of operating. The mechanical equipment comprises a vehicle containing a power device, and also can be combination of the vehicle containing the power device and a vehicle which does not contain the power device. Compared with electric equipment containing a converter and a power device in the prior art, the electric system has the advantages that the power of the inverter is smaller than that of the converter, the weight is low, needed multiple cooling modes are achieved, the maintenance is convenient, the requirement that the occupying space and the weight of the electric system are reduced is realized, meanwhile, the maintenance convenience and cooling requirement of the electric system can be considered, and light weight and miniaturization of the mechanical equipment capable of operating can be realized, so that the integral balance weight and space distribution can be facilitated.

Description

technical field [0001] The present application relates to the field of electromechanical technology, and in particular, to an operational mechanical device and its electrical system. Background technique [0002] For electrical systems of existing mechanical equipment, please refer to figure 1 , when the power equipment of mechanical equipment needs a three-phase AC power supply with adjustable frequency and voltage, the power supply is generally realized through a converter, that is, the single AC power provided by the power supply equipment is first converted into DC power through the converter, and then the DC power is converted into DC power. converted into the three-phase alternating current and output to the power equipment. When the voltage of the power supply equipment is too high for the mechanical equipment, it is necessary to add a transformer to step down the AC power of the power supply equipment. [0003] An operational mechanical equipment is a typical mecha...

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Problems solved by technology

[0003] An operational mechanical equipment is a typical mechanical equipment that requires the above electrical system, such as a vehicle that can run at high speed. The electrical system of the mechanical equipment includes transformers, converters and power equipment. When configuring the electrical system, the The converter and the power equipment in the electrical system are arranged on the main vehicle together. In order to save space, reduce the weight of the vehicle, and reduce the size of the main vehicle, an auxiliary vehicle is usually equipped outside the main vehicle for The transformer in the above electrical system is installed, and the voltage provided by the power supply equipment is stepped down and then output to the converter of the main vehicle. The auxiliary vehicle is not equipped with power equipment and moves together under the power drive of the main vehicle. However, the inventor found in the process of realizing the present invention that since the circuit structure of the converter is relatively complex and the power is relatively large during operation, a relatively large-power cooling device is required to cool it down. Another convenience is to consider the convenience of maintenance. The electrical system of the main vehicle occupies a large space and is heavy, which makes the overall space of the main vehicle tight and the counterweight is unreasonable, which is contradictory to the development direction of lightweight and miniaturized vehicles

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