A few 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 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 become self-sufficient producers of electricity and increase their revenues by as much as $1 million a season by selling surplus power to the local grid.
Pumps operated with adjustable and Variable Speed Electric Motor higher speed electrical motors provide numerous benefits such as for example greater selection 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 selecting the correct system of pump, electric motor, and electronic engine driver for optimum conversation with the procedure system. Successful pump selection requires understanding of the full anticipated range of heads, flows, and specific gravities. Engine selection requires appropriate thermal derating and, at times, a matching of the motor’s electrical characteristic to the VFD. Despite these extra design factors, variable velocity pumping is becoming well approved and widespread. In a simple manner, a conversation is presented on how to identify the huge benefits that variable velocity offers and how exactly to select elements for trouble free, reliable operation.
The first stage of a Variable Frequency AC Drive, or VFD, may be the Converter. The converter is definitely comprised of six diodes, which act like check valves found in plumbing systems. They allow current to circulation in only one direction; the direction proven by the arrow in the diode symbol. For instance, whenever A-phase voltage (voltage is comparable to pressure in plumbing systems) is more positive than B or C stage voltages, then that diode will open and invite current to circulation. When B-phase becomes more positive than A-phase, then your B-phase diode will open up and the A-phase diode will close. The same holds true for the 3 diodes on the negative aspect of the bus. Thus, we obtain six current “pulses” as each diode opens and closes.
We can get rid of 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 delivers a soft dc voltage. The AC ripple on the DC bus is typically significantly less than 3 Volts. Thus, the voltage on the DC bus turns into “around” 650VDC. The actual voltage will depend on the voltage level of the AC series feeding the drive, the amount of voltage unbalance on the energy system, the engine 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, is sometimes just referred to as a converter. The converter that converts the dc back 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 electricity effectively and increase productivity in energy-intensive industries like cement, metals, mining, coal and oil, power generation, and pulp and paper.