Some of the improvements attained by EVER-POWER drives in energy efficiency, productivity and procedure control are truly remarkable. For instance:
The savings are worth about $110,000 a year and have cut the company’s annual carbon footprint by 500 metric tons.
EVER-POWER medium-voltage drive systems allow 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 season by selling surplus capacity to the local grid.
Pumps operated with adjustable and higher speed electric motors provide numerous benefits such as for example greater selection of flow and mind, higher head from an individual stage, valve elimination, and energy saving. To achieve these benefits, nevertheless, extra care should be taken in selecting the correct system of pump, electric motor, and electronic motor driver for optimum conversation with the procedure system. Successful pump selection requires knowledge of the full anticipated range of heads, flows, and specific gravities. Motor selection requires appropriate thermal derating and, sometimes, a matching of the motor’s electrical characteristic to the VFD. Despite these extra design factors, variable rate pumping is becoming well accepted and widespread. In a straightforward manner, a conversation is presented about how to identify the huge benefits that variable acceleration offers and how to select elements for hassle free, reliable operation.
The first stage of a Variable Frequency AC Drive, or VFD, may be the Converter. The converter is certainly comprised of six diodes, which are similar to check valves used in plumbing systems. They allow current to stream in mere one direction; the direction proven by the arrow in the diode symbol. For example, whenever A-stage voltage (voltage is similar to pressure in plumbing systems) is definitely more positive than B or C stage voltages, then that diode will open and allow current to movement. When B-stage 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 side 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 by adding a capacitor. A capacitor operates in a similar style to a reservoir or accumulator in a plumbing system. This capacitor absorbs the ac ripple and provides a smooth dc voltage. The AC ripple on the DC bus is normally significantly less than 3 Volts. Thus, the voltage on the DC bus becomes “approximately” 650VDC. The real voltage depends on the voltage degree of the AC range 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 Variable Speed Motor 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 again to ac can be a converter, but to tell apart it from the diode converter, it is generally referred to 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, oil and gas, power generation, and pulp and paper.