A few of the improvements attained by EVER-POWER drives in energy efficiency, productivity and process control are truly remarkable. For instance:
The savings are worth about $110,000 a year and have slice the company’s annual carbon footprint by 500 metric tons.
EVER-POWER medium-voltage drive systems enable sugar cane plants throughout Central America to become 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 greater selection of flow and head, higher head from an individual stage, valve elimination, and energy conservation. To achieve these benefits, however, extra care should be taken in selecting the appropriate system of pump, engine, and electronic electric motor driver for optimum Variable Speed Electric Motor interaction with the procedure system. Successful pump selection requires understanding of the complete anticipated selection of heads, flows, and particular gravities. Engine selection requires appropriate thermal derating and, at times, a matching of the motor’s electrical characteristic to the VFD. Despite these extra design factors, variable velocity pumping is becoming well approved and widespread. In a straightforward manner, a dialogue is presented on how to identify the huge benefits that variable quickness offers and how exactly to select elements for hassle free, reliable operation.
The first stage of a Variable Frequency AC Drive, or VFD, may be the Converter. The converter is made up of six diodes, which act like check valves used in plumbing systems. They allow current to stream in mere one direction; the path proven by the arrow in the diode symbol. For example, whenever A-phase voltage (voltage is comparable to pressure in plumbing systems) is definitely more positive than B or C stage voltages, after that that diode will open up and invite current to circulation. When B-phase turns into more positive than A-phase, then the B-phase diode will open and the A-phase diode will close. The same holds true for the 3 diodes on the negative aspect of the bus. Hence, we obtain 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 operates in a similar style to a reservoir or accumulator in a plumbing program. This capacitor absorbs the ac ripple and provides a smooth dc voltage. The AC ripple on the DC bus is normally significantly less than 3 Volts. Hence, the voltage on the DC bus turns into “around” 650VDC. The real voltage will depend on the voltage level of the AC series feeding the drive, the level of voltage unbalance on the power system, the electric motor load, the impedance of the power program, and any reactors or harmonic filters on the drive.
The diode bridge converter that converts AC-to-DC, is sometimes just known 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”.
In fact, drives are an integral part of much larger EVER-POWER power and automation offerings that help customers use electricity effectively and increase productivity in energy-intensive industries like cement, metals, mining, coal and oil, power generation, and pulp and paper.