There are two control modes of variable frequency speed regulating motor + reducer. The first control mode is frequency conversion, and the second control mode is frequency conversion.
The power factor of frequency conversion system is low, which will produce higher harmonics during startup and operation, causing pollution to the power grid. Frequent starting of motor will also cause great reactive power impact on the power grid, which must be treated comprehensively. Compared with frequency conversion equipment, the investment is low.
Due to the filter unit and compensation unit in the device, the power factor of frequency conversion system is greater than 0.9, and the higher harmonic component is very small, which will not cause harmonic pollution. There is no need to specially set up harmonic absorption and reactive power compensation device.
However, frequency conversion transmission system with single power greater than 2000kW can not be produced in China at present, and the equipment and spare parts must be imported, Compared with frequency conversion equipment, the investment is higher. It is generally used in large-scale vertical roller mill with speed regulation function.
