Some of the improvements attained by EVER-POWER drives in energy performance, 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 allow sugar cane plants throughout Central America to become self-sufficient producers of electrical energy and increase their revenues by as much as $1 million a season by selling surplus capacity to the local grid.
Pumps operated with variable and higher speed electric motors provide numerous benefits such as greater selection of flow and mind, higher head from a single stage, valve elimination, and energy saving. To attain these benefits, however, extra care must be taken in choosing the appropriate system of pump, electric motor, and electronic motor driver for optimum interaction with the process system. Successful pump selection requires understanding of the complete anticipated selection of heads, flows, and specific gravities. Electric motor selection requires suitable thermal derating and, at times, a matching of the motor’s electrical characteristic to the VFD. Despite these extra design factors, variable rate pumping is now well approved and widespread. In a simple manner, a debate is presented about how to 
identify the benefits that variable quickness offers and how to select Variable Speed Electric Motor components for trouble free, reliable operation.
The first stage of a Adjustable Frequency AC Drive, or VFD, is the Converter. The converter can be made up of six diodes, which are similar to check valves used in plumbing systems. They enable current to flow in only one direction; the direction demonstrated by the arrow in the diode symbol. For instance, whenever A-phase voltage (voltage is comparable to pressure in plumbing systems) is more positive than B or C phase voltages, then that diode will open and allow current to flow. When B-phase becomes more positive than A-phase, then the B-phase diode will open up and the A-stage diode will close. The same is true for the 3 diodes on the negative part of the bus. Therefore, we obtain six current “pulses” as each diode opens and closes.
We can get rid of the AC ripple on the DC bus with the addition of a capacitor. A capacitor works in a similar style to a reservoir or accumulator in a plumbing system. This capacitor absorbs the ac ripple and delivers a simple dc voltage. The AC ripple on the DC bus is normally significantly less than 3 Volts. Thus, the voltage on the DC bus becomes “approximately” 650VDC. The actual voltage will depend on the voltage degree of the AC line feeding the drive, the level of voltage unbalance on the energy system, the motor load, the impedance of the power system, and any reactors or harmonic filters on the drive.
The diode bridge converter that converts AC-to-DC, is sometimes just referred to as a converter. The converter that converts the dc back to ac can be a converter, but to distinguish it from the diode converter, it is generally known as an “inverter”.
In fact, drives are a fundamental element of much bigger 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.