Application of the Xindashida AS700 Four-Quadrant Inverter in Coal Mining Machines in the Coal Mining Industry
2025-06-05
Application of the Xindashida AS700 Four-Quadrant Inverter in Coal Mining Machines in the Coal Mining Industry
Project Background
The shearer is the flagship equipment in underground coal mining operations. Due to its highly concentrated electrical system and the wide variety of components involved, faults are often difficult to diagnose and troubleshoot, making shearer maintenance a persistent challenge.
Guided by the principles of practicality, intelligence, environmental friendliness, and energy efficiency, Xindashida has joined forces with a leading enterprise in the coal industry to jointly and meticulously design an intelligent testing platform. This platform provides precise data-driven support for the maintenance and remanufacturing of coal mining machines, ensuring the stability and reliability of the equipment.
Customer needs
Provide effective support for testing indicators such as torque and temperature rise during the return-to-factory maintenance process of coal mining machinery equipment, enhance the detection efficiency and repair quality of electrical components controlling the coal mining machinery, and reduce the labor intensity of workers.
Xinshida Solution
Scheme advantages
For the remanufacturing and repair of coal mining machinery equipment at the factory, the test bench plays a critical role. The Xinshida AS700 series four-quadrant frequency converter boasts the following distinctive features:
● Composed of an LCL filtering unit, an AFE rectifier and regenerative unit, and an inverter unit, this system can both feed energy back into the power grid and comply with the requirements of GB/T 14549-93 “Harmonics in Public Power Grids” and the “IEEE 519” standards for power quality. Moreover, the frequency converter should not introduce any harmonic interference to other control cabinets within the main control system.
● The control algorithm is superior, enabling both closed-loop vector and open-loop vector control, with seamless switching between the two modes.
● The operating speed can be set directly, and a torque-limiting function is available;
● Inverter internal current-sharing control to prevent uneven power consumption among individual control units;
● Equipped with PROFINET communication control functionality and capable of switching between two sets of motor parameter communications;
● Zero-speed full torque: The torque can be preset at zero speed and freely adjusted within a range of 1% to 100%. The torque-limiting error is less than 3%.
Scheme Composition
The entire test bench system is controlled via a PROFINET communication network and utilizes the Xindashida AS700 series four-quadrant frequency converters, which have successfully achieved domestic substitution. With these converters, the test bench can seamlessly switch between electric mode and regenerative mode. The system block diagram is shown below:
Test Bench System Block Diagram
Associated products
AS700 Air-Cooled Multi-Machine Drive Inverter
Project Results
The test bench has high requirements for torque accuracy. In this test, the torque output fluctuation of the frequency converter remained within ±1.00%, and the torque output was accurate to 0.01. By improving the accuracy of torque setpoint, the current waveform at the frequency converter output closely approximated a sine wave, and the current distribution among all units was normal.
This test bench comprises a total of three testing systems. The AS700 series four-quadrant inverters from Xindashida are available in two voltage ratings: 380V and 690V. Among these, the cutting unit and traction rocker arm testing systems are powered by a 690V power supply and are designed for stepwise loading and full-load testing of rocker arms and traction components for shearer machines rated at 1400kW or lower. These systems can meet the factory testing requirements for cutting and traction components of currently mainstream shearer models across various power ratings. The load-inverter testing system for the one-to-two inverter configuration is powered by a 380V supply and can accommodate daily testing that involves switching between two modes—loading and power generation—for inverters rated up to 150kW. The inverters in this system adopt AFE rectifiers with common DC bus power supply; during the loading process, energy is fed back into the grid, thereby improving energy utilization efficiency.
With economic development, the coal industry has continued to expand in scale, making it imperative to enhance the technological and production levels of the coal mining sector. In response to the industry’s evolving needs, Xindashida has pioneered the application of four-quadrant variable-frequency drive energy-saving technology in coal mining machinery and equipment, significantly boosting the system’s automation level. This breakthrough provides strong support for coal mining enterprises to reduce costs, improve efficiency, and promote sustainable development!
Torque ripple within 1%
Output current waveform of the inverter
One-to-Two Load Frequency Converter
One-to-two load motor
Variable-frequency drive for rocker arm traction loading
Rocker Arm Traction Test Bench
