Some of the improvements attained by EVER-POWER drives in energy efficiency, productivity and procedure control are truly remarkable. For instance:
The savings are worth about $110,000 a year and also have cut the company’s annual carbon footprint by 500 metric tons.
EVER-POWER medium-voltage drive systems enable sugar cane vegetation throughout Central America to be self-sufficient producers of electricity and increase their revenues by as much as $1 million a year by selling surplus power to the local grid.
Pumps operated with variable and higher speed electric motors provide numerous benefits such as for example greater selection of flow and mind, higher head from an individual stage, valve elimination, and energy saving. To attain these benefits, however, extra care must be taken in selecting the appropriate system of pump, engine, and electronic motor driver for optimum conversation with the process system. Successful pump selection requires knowledge of the full anticipated range of heads, flows, and specific gravities. Engine selection requires suitable thermal derating and, at times, a matching of the motor’s Variable Speed Electric Motor electrical feature to the VFD. Despite these extra design factors, variable velocity pumping is now well recognized and widespread. In a simple manner, a debate is presented on how to identify the huge benefits that variable quickness offers and how to select components for trouble free, reliable operation.
The first stage of a Variable Frequency AC Drive, or VFD, is the Converter. The converter is usually made up of six diodes, which are similar to check valves found in plumbing systems. They enable current to movement in mere one direction; the path shown by the arrow in the diode symbol. For instance, whenever A-stage voltage (voltage is comparable to pressure in plumbing systems) is more positive than B or C stage voltages, after that that diode will open up and allow current to movement. When B-stage turns into more positive than A-phase, then your B-phase diode will open and the A-phase diode will close. The same is true for the 3 diodes on the negative part of the bus. Therefore, we get six current “pulses” as each diode opens and closes.
We can get rid of the AC ripple on the DC bus by adding a capacitor. A capacitor functions in a similar fashion to a reservoir or accumulator in a plumbing system. This capacitor absorbs the ac ripple and delivers a clean dc voltage. The AC ripple on the DC bus is typically less than 3 Volts. Hence, the voltage on the DC bus becomes “around” 650VDC. The real voltage will depend on the voltage level of the AC range feeding the drive, the level of voltage unbalance on the power system, the engine load, the impedance of the energy system, and any reactors or harmonic filters on the drive.
The diode bridge converter that converts AC-to-DC, may also be just referred to as a converter. The converter that converts the dc 
back to ac can be a converter, but to tell apart it from the diode converter, it is normally referred to as an “inverter”.
Actually, drives are an integral part of much larger EVER-POWER power and automation offerings that help customers use electrical energy effectively and increase productivity in energy-intensive industries like cement, metals, mining, oil and gas, power generation, and pulp and paper.