Beijing Leader & Harvest Electric Technologies Co., Ltd.
Home » Application » Mining

1. Medium voltage Variable Frequency Drive application in gas drainage system of coal mine
Annual production of Chongqing First Mine is 1500kt/a now. According to company plan, the production of raw coal is going to be up to 2400kt/a gradually. With increasing poduction and exploitation, gas rushing is more and more, which affects safety of production and development in mine. Draining gas by pump in goaf can control gas amount of coal face and air return system ...

2. Reform with Variable Frequency Drive in Xingcun Coal Mining
Install an impeller behind of another but rotating direction of impellers is opposite. We call this contra-rotating axial-flow fan. Two levels of impellers are contraposition and they are driven by same model motors. Watching from inlet, first level impeller rotates clockwise and the second level impeller rotates anticlockwise. Entering the first impeller ...

3. MV Variable Frequency Drive application in Xinyuliangshan Ore Mill
Xinyuliangshan Ore Mill locates in Jiangxi Province. It supplies ore to Xinyu Steel Plant. Ore mill added an ore dressing equipment. There were 3 same model pumps with isolation which were driven by high voltage motors. In normal operation, 2 pumps worked and the third was spare. If motor started in direct on line, big current would impact on grid ...

4. Reform with Variable Frequency Drive in contra-rotating axial-flow fan in mine
Contra-rotating axial-flow fan is backbone of breath system in mine. It works in 24 hours continuously. With digging and exploring extending, lane prolongs and air flow damand increases continuously. Fan power should increase. Air flow demand also requires to be adjusted due to seasons come and go. But power of motor and fan in coal mine is usually far more than ...

5. Variable Frequency Drive application in ID fan of flue gas purification system
In most middle/large mining companies, power consumption of motor accounts for 50% of total power consumption. LV Variable Frequency Drive is very common. But, defectiveness of MV variable frequency technology, and voltage withstand capacity of components have been restricting MV Variable Frequency Drive development and its application ...

6. HARSVERT-FVA series Variable Frequency Drive application in hoisting machine of coal mine
For long term, hoisting machine adopts rotor series resistance to adjust speed. It is low cost but with big torque, high consumption and complicated circuit. It damages contactor, resistor and electrical brush easily, which threatens system safety. With rapid development of power and motor technology, variable frequency technology can solve above problems.

7. Application of Medium-voltage Variable Frequency Drive in Large Medium Pumps for Heavy Medium Coal Selecting Technology
Coal selecting with heavy medium has been applied by coal processing enterprises more and more, because it needs less investment, and has short construction period, high washing and selecting depth, stable product quality and obvious economic benefits, etc. During the production, the speed regulating of the key equipment-medium pumps and the reasonable ...

Variable Frequency Drive
  • A VFD HARSVERT-A series VFD is a masterpiece of outstanding performance and high reliability, which is widely used for the energy-saving application of the normal motors of fans, pumps ...
  • VA VFD Input current harmonic: <3% (comply with standard IEEE519);
    Input power factor: >0.95(>20% load);
    Output current harmonic: <2.5%; output DC ...
  • VS VFD Vector control for the speed-adjustment of synchronous motor;
    Start ability for starting the synchronous motor with load;
    The response time of dynamic torque: less ...
  • FVS VFD PWM rectifier technology. Energy can flow bi-directionally between power grid and the motor;
    Vector control for synchronous motor;
    Strong start up with load in ...