Some of the improvements achieved by EVER-POWER drives in energy performance, productivity and process control are truly remarkable. For example:
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 enable sugar cane vegetation throughout Central America to be self-sufficient producers of electricity and enhance their revenues by as much as $1 million a year by selling surplus capacity to the local grid.
Pumps operated with variable and higher speed electrical motors provide numerous Variable Speed Electric Motor benefits such as for example greater range of flow and mind, higher head from an individual stage, valve elimination, and energy saving. To attain these benefits, nevertheless, extra care must be taken in selecting the correct system of pump, motor, and electronic engine driver for optimum conversation with the process system. Successful pump selection requires knowledge of the full anticipated range of heads, flows, and specific gravities. Engine selection requires suitable thermal derating and, at times, a complementing of the motor’s electrical characteristic to the VFD. Despite these extra design factors, variable velocity pumping is now well approved and widespread. In a simple manner, a conversation is presented on how to identify the benefits that variable acceleration offers and how exactly to select components for trouble free, reliable operation.
The first stage of a Variable Frequency AC Drive, or VFD, may be the Converter. The converter is certainly 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 demonstrated 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, after that that diode will open up and allow current to circulation. When B-stage turns into more positive than A-phase, then the B-phase diode will open and the A-phase diode will close. The same holds true for the 3 diodes on the negative part 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 functions in a similar fashion to a reservoir or accumulator in a plumbing system. This capacitor absorbs the ac ripple and provides a easy dc voltage. The AC ripple on the DC bus is typically less than 3 Volts. Thus, the voltage on the DC bus turns into “around” 650VDC. The actual voltage depends on the voltage degree of the AC collection feeding the drive, the amount of voltage unbalance on the power 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, 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 normally referred to as an “inverter”.
In fact, drives are an integral part 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.