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 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 electricity and enhance their revenues by as much as $1 million a calendar 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 engine driver for optimum interaction with the process system. Effective pump selection requires understanding of the full anticipated selection of heads, flows, and particular gravities. Engine selection requires suitable thermal derating and, at times, a complementing of the motor’s electrical characteristic to the VFD. Despite these extra design factors, variable velocity pumping is becoming well accepted and widespread. In a straightforward manner, a conversation is presented about how to identify the benefits that variable acceleration 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 can be made up of six diodes, which act like check valves used in plumbing systems. They allow current to stream in mere 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 definitely 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 your B-phase diode will open and the A-phase diode will close. The same holds true for the 3 Variable Speed Motor diodes on the negative part of the bus. Therefore, we get six current “pulses” as each diode opens and closes.
We can eliminate the AC ripple on the DC bus by adding a capacitor. A capacitor functions in a similar style to a reservoir or accumulator in a plumbing program. This capacitor absorbs the ac ripple and delivers a simple dc voltage. The AC ripple on the DC bus is normally less than 3 Volts. Therefore, the voltage on the DC bus turns into “approximately” 650VDC. The actual voltage will depend on the voltage level of the AC series feeding the drive, the amount 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 referred to as a converter. The converter that converts the dc back again to ac is also a converter, but to distinguish it from the diode converter, it is usually known as an “inverter”.

In fact, drives are an integral part of much bigger 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.