A few of the improvements achieved by EVER-POWER drives in energy efficiency, productivity and process control are truly remarkable. For example:
The savings are worth about $110,000 a year and also 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 electricity and boost their revenues by as much as $1 million a calendar year by selling surplus power to the local grid.
Pumps operated with adjustable and higher speed electric motors provide numerous benefits such as greater range of flow and mind, higher head from a single stage, valve elimination, and energy conservation. To accomplish these benefits, nevertheless, extra care should be taken in choosing the correct system of pump, motor, and electronic engine driver for optimum conversation with the Variable Speed Motor procedure system. Effective pump selection requires knowledge of the full anticipated selection of heads, flows, and particular gravities. Engine selection requires suitable thermal derating and, sometimes, a matching of the motor’s electrical feature to the VFD. Despite these extra design factors, variable rate pumping is becoming well approved and widespread. In a simple manner, a discussion is presented on how to identify the benefits that variable swiftness offers and how to select components for hassle free, reliable operation.
The first stage of a Variable Frequency AC Drive, or VFD, is the Converter. The converter is usually made up of six diodes, which are similar to check valves found in plumbing systems. They enable current to movement in only one direction; the path demonstrated by the arrow in the diode symbol. For example, whenever A-stage voltage (voltage is comparable to pressure in plumbing systems) is definitely more positive than B or C phase voltages, then that diode will open and invite current to stream. When B-phase turns into more positive than A-phase, then the B-phase diode will open up and the A-phase diode will close. The same is true for the 3 diodes on the negative aspect 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 works 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 less than 3 Volts. Therefore, the voltage on the DC bus turns into “around” 650VDC. The actual voltage will depend 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 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 again to ac can be a converter, but to tell apart it from the diode converter, it is normally known as an “inverter”.
Actually, 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, oil and gas, power generation, and pulp and paper.