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How to implement frequency conversion effect of decanter centrifuge

2017-05-25
DCLW Frequency Variable Centrifuges are a hot sales product of DC Machinery company. With PLC-controlled variable frequency drives controlling bowl and conveyor speed as well as feed rate, the Frequency Variable Centrifuge can be rapidly optimized for most efficient solids control in a wide range of drilling applications. 

A decanter centrifuge includes a control system for receiving input AC power and outputting a variable voltage and frequency for controlling the speed of the backdrive and the main drive motor. The control system includes a first controller for converting AC power into DC power and then converting the DC power to AC power at a variable voltage and frequency to the main drive motor.

A second controller is connected to the first conversion unit through a common DC bus. The second controller converts DC power to AC power and supplies AC power at a variable frequency to the backdrive motor. 

The braking force created by the backdrive motor during operation of the decanter centrifuge creates electricity which is passed through the second controller and through the common DC bus to the first controller. Thus, the generated power from the backdrive motor is converted into power for use by the main drive motor. 

A regeneration package may also be provided in order to supply the generated power from the backdrive to the AC input line during decelerating the conveyor when the bowl is simultaneously being decelerated and the main drive motor is also generating power.