A few of the improvements achieved 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 have cut 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 variable and higher speed electric motors Variable Speed Motor 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 attain these benefits, however, extra care must be taken in selecting the appropriate system of pump, engine, and electronic electric motor driver for optimum conversation with the process system. Effective pump selection requires understanding of the full anticipated range of heads, flows, and specific gravities. Electric motor selection requires appropriate thermal derating and, sometimes, a coordinating of the motor’s electrical characteristic to the VFD. Despite these extra design factors, variable quickness pumping is becoming well recognized and widespread. In a simple manner, a conversation 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, may be the Converter. The converter is comprised of six diodes, which are similar to check valves found in plumbing systems. They enable current to circulation in mere one direction; the direction shown by the arrow in the diode symbol. For example, whenever A-phase voltage (voltage is similar to pressure in plumbing systems) is more positive than B or C phase voltages, then that diode will open and invite current to stream. When B-phase becomes more positive than A-phase, then the B-phase diode will open up and the A-phase diode will close. The same holds true for the 3 diodes on the negative part of the bus. Therefore, we get 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 functions in a similar style to a reservoir or accumulator in a plumbing system. This capacitor absorbs the ac ripple and delivers a smooth dc voltage. The AC ripple on the DC bus is typically less than 3 Volts. Hence, the voltage on the DC bus becomes “approximately” 650VDC. The real voltage will depend on the voltage level of the AC collection feeding the drive, the level of voltage unbalance on the power system, the motor 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, may also be just known as a converter. The converter that converts the dc back to ac is also a converter, but to distinguish it from the diode converter, it is usually referred to as an “inverter”.
In fact, 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, oil and gas, power generation, and pulp and paper.