A few of the improvements achieved by EVER-POWER drives in energy effectiveness, productivity and process control are truly remarkable. For example:
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 yr by selling surplus power to the local grid.
Pumps operated with variable and higher speed electrical motors provide numerous benefits such as greater selection of flow and mind, higher head from a single stage, valve elimination, and energy saving. To accomplish these benefits, nevertheless, extra care must be taken in choosing the correct Variable Speed Motor system of pump, engine, and electronic motor driver for optimum interaction with the procedure system. Effective pump selection requires understanding of the full anticipated range of heads, flows, and specific gravities. Motor selection requires appropriate thermal derating and, sometimes, a matching of the motor’s electrical characteristic to the VFD. Despite these extra design factors, variable speed pumping is becoming well approved and widespread. In a simple manner, a discussion is presented on how to identify the huge benefits that variable speed offers and how exactly to select parts for trouble free, reliable operation.
The first stage of a Variable Frequency AC Drive, or VFD, is the Converter. The converter is usually comprised of six diodes, which are similar to check valves found in plumbing systems. They allow current to flow in mere one direction; the path demonstrated by the arrow in the diode symbol. For instance, whenever A-stage voltage (voltage is similar to pressure in plumbing systems) is certainly more positive than B or C phase voltages, after that that diode will open and allow current to circulation. When B-phase becomes more positive than A-phase, then the B-phase diode will open and the A-stage 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 eliminate 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 clean dc voltage. The AC ripple on 
the DC bus is typically significantly less than 3 Volts. Hence, the voltage on the DC bus turns into “around” 650VDC. The actual voltage will depend on the voltage degree 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, 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 generally referred to 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, oil and gas, power generation, and pulp and paper.