Some of the improvements achieved by EVER-POWER drives in energy efficiency, productivity and procedure control are truly remarkable. For instance:
The savings are worth about $110,000 a year and have slice the company’s annual carbon footprint by 500 metric tons.
EVER-POWER medium-voltage drive systems enable sugar cane plants throughout Central America to be self-sufficient producers of electricity and enhance 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 electric motors provide numerous benefits such as greater range of flow and head, higher head from a single stage, valve elimination, and energy saving. To accomplish these benefits, nevertheless, extra care should be taken in choosing the appropriate Variable Speed Motor system of pump, engine, and electronic motor driver for optimum conversation with the procedure system. Effective pump selection requires understanding of the complete anticipated selection of heads, flows, and particular gravities. 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 velocity pumping is becoming well recognized and widespread. In a simple manner, a dialogue is presented on how to identify the benefits that variable quickness offers and how exactly to select elements for hassle free, reliable operation.
The first stage of a Adjustable Frequency AC Drive, or VFD, may be the Converter. The converter is usually made up of six diodes, which are similar to check valves used in plumbing systems. They allow current to flow in mere one direction; the path shown by the arrow in the diode symbol. For example, 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 up and allow current to circulation. 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 diodes on the negative side of the bus. Therefore, 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 works in a similar style 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 less than 3 Volts. Therefore, the voltage on the DC bus turns into “approximately” 650VDC. The real voltage depends on the voltage level of the AC series feeding the drive, the amount 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 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.