Some of the improvements achieved by EVER-POWER drives in energy effectiveness, productivity and procedure 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 vegetation throughout Central America to be self-sufficient producers of electricity and increase their revenues by as much as $1 million a calendar year by selling surplus power to the local grid.
Pumps operated with adjustable and higher speed electric motors provide numerous benefits such as for example greater range of flow and head, higher head from a single stage, valve elimination, and energy conservation. To accomplish these benefits, nevertheless, extra care must be taken in choosing the correct system of pump, engine, and electronic electric motor driver for optimum interaction with the process system. Effective 
pump selection requires understanding of the complete anticipated range of heads, flows, and specific gravities. Electric motor selection requires suitable thermal derating and, at times, a complementing of the motor’s electrical feature to the VFD. Despite these extra design considerations, variable swiftness pumping is becoming well approved and widespread. In a straightforward manner, a dialogue is presented about how to identify the benefits that variable velocity offers and how to select elements for trouble free, reliable operation.
The first stage of a Variable Frequency AC Drive, or VFD, is the Converter. The converter is definitely made up of six diodes, which are similar to check valves found in plumbing systems. They allow current to flow 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) can be more positive than B or C stage voltages, then that diode will open up and allow current to flow. When B-stage turns into more positive than A-phase, then the B-phase diode will open up and the A-stage diode will close. The same holds true for the 3 diodes on the negative side 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 Variable Speed Motor capacitor works in a similar style to a reservoir or accumulator in a plumbing program. This capacitor absorbs the ac ripple and provides a soft dc voltage. The AC ripple on the DC bus is normally significantly less than 3 Volts. Hence, the voltage on the DC bus becomes “approximately” 650VDC. The real voltage depends on the voltage degree of the AC line feeding the drive, the amount of voltage unbalance on the power system, the 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, may also be just referred to as a converter. The converter that converts the dc back to ac is also a converter, but to tell apart it from the diode converter, it is generally known as an “inverter”.
In fact, drives are a fundamental element 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, oil and gas, power generation, and pulp and paper.
