Some of the improvements achieved by EVER-POWER drives in energy performance, productivity and procedure control are truly remarkable. For instance:
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 plants throughout Central America to be self-sufficient producers of electrical energy and boost their revenues by as much as $1 million a yr by selling surplus power to the local grid.
Pumps operated with variable and higher speed electric motors provide numerous benefits such as for example greater range of flow and mind, higher head from a single stage, valve elimination, and energy conservation. To achieve these benefits, nevertheless, extra care should be taken in choosing the appropriate system of pump, electric motor, and electronic motor driver for optimum interaction with the process system. Successful pump selection requires knowledge of the full anticipated selection of heads, flows, and specific gravities. Motor selection requires appropriate thermal derating and, at times, a complementing of the motor’s electrical feature to the VFD. Despite these extra design considerations, variable rate pumping is becoming well accepted and widespread. In a straightforward manner, a dialogue is presented on how to identify the benefits that variable quickness offers and how to select elements for trouble free, reliable operation.
The first stage of a Adjustable Frequency AC Drive, or VFD, may be the Converter. The converter is comprised of six diodes, which act like check valves found in plumbing systems. They allow current to stream in only one direction; the path demonstrated by the arrow in the diode symbol. For instance, whenever A-stage voltage (voltage is similar to pressure in plumbing systems) is more positive than B or C stage voltages, then that diode will open and invite current to flow. When B-phase becomes more positive than A-phase, then the B-phase diode will open up and the A-stage diode will close. The same is true for the 3 diodes on the negative part of the bus. Hence, we get 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 delivers a smooth dc voltage. The AC ripple on the DC bus is normally less than 3 Volts. Thus, the voltage on the DC bus turns into “approximately” Variable Speed Motor 650VDC. The real voltage depends on the voltage degree of the AC series feeding the drive, the level of voltage unbalance on the power 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, is sometimes just known 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”.
In fact, 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.