Some of the improvements attained by EVER-POWER drives in energy performance, productivity and process control are truly remarkable. For instance:
The savings are worth about $110,000 a year and also have slice the company’s annual carbon footprint by 500 metric tons.
EVER-POWER medium-voltage drive systems allow sugar cane plant life 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 adjustable and higher speed electrical motors provide numerous benefits such as for example greater range of flow and head, higher head from an individual stage, valve elimination, and energy saving. To accomplish these benefits, however, extra care should be taken in choosing the correct 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 range of heads, flows, and particular gravities. Electric motor selection requires appropriate thermal derating and, sometimes, a coordinating of the motor’s electrical feature to the VFD. Despite these extra design considerations, variable rate pumping is now well accepted and widespread. In a simple manner, a debate is presented on how to identify the huge benefits that variable velocity offers and how exactly to select components for hassle free, reliable operation.
The first stage of a Adjustable Frequency AC Drive, or VFD, may be the Converter. The converter is made up of six diodes, which are similar to check valves found in plumbing systems. They allow current to flow in only one direction; the direction proven by the arrow in the diode symbol. For instance, whenever A-phase voltage (voltage is similar to pressure in plumbing systems) is usually more positive than B or C stage Variable Speed Motor voltages, after that that diode will open and allow current to stream. When B-phase becomes more positive than A-phase, then your 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 with the addition of a capacitor. A capacitor functions in a similar fashion 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 becomes “around” 650VDC. The actual voltage will depend on the voltage degree of the AC series feeding the drive, the level of voltage unbalance on the energy system, the electric 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, may also be just known as a converter. The converter that converts the dc back again to ac can be a converter, but to distinguish it from the diode converter, it is generally known as an “inverter”.
Actually, drives are a fundamental element of much larger EVER-POWER power and automation offerings that help customers use electrical energy effectively and increase productivity in energy-intensive industries like cement, metals, mining, coal and oil, power generation, and pulp and paper.