A Soft Start Control System for High Voltage and High Power Electric Hydraulic Excavator

Abstract

The invention relates to a soft start control system for a high-voltage and high-power electric hydraulic excavator. The soft starter is connected to the slip ring box and then to the main control unit, the main control unit is connected to the motor, the output shaft of the motor is connected to the hydraulic pump, the main control unit is connected to the soft starter through the slip ring box through an integrated cable, and the main control unit is also It is connected and communicated with the man-machine interface and the GPS device, and the GPS device communicates with the remote control center wirelessly. The soft start control system of the high-voltage and high-power electric hydraulic excavator provided by the present invention is applied to the 6kV / 10kV level, has the characteristics of strong power grid adaptability, small starting current, and diversified starting methods, and realizes the smooth start of the high-voltage motor without impact, Significantly save the boarding space, and can realize the transmission of high-voltage electric energy and CAN signal and remote data transmission.

Description

technical field [0001] The invention belongs to the technical field of construction machinery and is suitable for electric hydraulic excavators powered by grid electric energy, in particular to a soft start control system for high-voltage and high-power electric hydraulic excavators. Background technique [0002] With the increasing emphasis on environmental protection and the improvement of power sources in recent years, electric hydraulic excavators using electric motors to drive hydraulic systems have gradually become a new research direction and hot spot in the field of excavators. Traditional electro-hydraulic excavators generally adopt the control method of direct full-voltage starting of three-phase asynchronous motors. The starting equipment is simple, but there are disadvantages such as large starting current, large starting torque impact, and easy to cause shock fluctuations in the power grid. Coupling transformer starting and other step-down measures, the effect i...

AI Technical Summary

Problems solved by technology

Traditional electro-hydraulic excavators generally adopt the control method of direct full-voltage starting of three-phase asynchronous motors. The starting equipment is simple, but there are disadvantages such as large starting current, large starting torque impact, and easy to cause shock fluctuations in the power grid. Coupling transformer starting and other step-down measures, the effect is still unsatisfactory

In particular, the start-up problem of large electro-hydraulic excavators for mines with high-power high-voltage motors is particularly prominent. There are problems such as failure to start normally in a complex power grid environment, fragile motor shaft load connection devices, and affecting the normal operation of other power grid equipment, which is not conducive to the system. Power Regulation and Efficiency Improvement

[0003] With the rapid development of high-power power electronic devices, the soft-start device designed based on the thyristor three-phase AC voltage regulation circuit can realize the soft start of the motor without impact, and has a strong ability to resist power grid fluctuations, which can effectively prolong the life of the motor and machinery, and greatly improve the system performance. Starting efficiency and reliability, but because of its large size, the electro-hydraulic excavator has limited space on board, and there are many inconveniences in installation and maintenance

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