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 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 electrical energy and increase their revenues by as much as $1 million a yr by selling surplus power to the local grid.
Pumps operated with adjustable and higher speed electric motors provide numerous benefits such as greater selection of flow and mind, higher head from an individual stage, valve elimination, and energy saving. To accomplish these benefits, nevertheless, extra care should be taken in choosing the appropriate system of pump, motor, and electronic engine driver for optimum conversation with the process system. Successful pump selection requires understanding of the complete anticipated selection of heads, flows, and specific gravities. Motor selection requires appropriate thermal derating and, at times, a coordinating of the motor’s electrical characteristic to the VFD. Despite these extra design considerations, variable velocity pumping is now well accepted and widespread. In a simple manner, a conversation is presented on how to Variable Speed Motor identify the benefits that variable speed offers and how exactly to select components for hassle free, reliable operation.
The first stage of a Adjustable Frequency AC Drive, or VFD, is the Converter. The converter is made up of six diodes, which are similar to check valves used in plumbing systems. They allow current to movement in only one direction; the direction shown by the arrow in the diode symbol. For example, whenever A-stage voltage (voltage is comparable to pressure in plumbing systems) is more positive than B or C stage voltages, after that that diode will open up and allow current to circulation. When B-stage becomes more positive than A-phase, then the B-phase diode will open and the A-stage diode will close. The same is true for the 3 diodes on the negative aspect 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 with the addition of a capacitor. A capacitor operates in a similar fashion to a reservoir or accumulator in a plumbing system. This capacitor absorbs the ac ripple and provides a even 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 real voltage depends on the voltage level of the AC collection feeding the drive, the level of voltage unbalance on the energy system, the engine load, the impedance of the energy program, and any reactors or harmonic filters on the drive.
The diode bridge converter that converts AC-to-DC, may also be just referred to as a converter. The converter that converts the dc back to ac is also a converter, but to tell apart it from the diode converter, it is generally referred to as an “inverter”.
Actually, 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, coal and oil, power generation, and pulp and paper.