Some of the improvements attained 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 plants throughout Central America to become self-sufficient producers of electricity and increase their revenues by as much as $1 million a 12 months by selling surplus power to the local grid.
Pumps operated with variable and higher speed electrical motors provide numerous benefits such as for example greater selection of flow and mind, higher head from a single stage, valve elimination, and energy saving. To accomplish these benefits, nevertheless, extra care must be taken in choosing the correct system of pump, electric motor, and electronic electric motor driver for optimum conversation with the procedure system. Successful pump selection requires understanding of the full anticipated range of heads, flows, and particular gravities. Electric motor selection requires appropriate thermal derating and, sometimes, a complementing of the motor’s electrical characteristic to the VFD. Despite these extra design considerations, variable swiftness pumping is becoming well approved and widespread. In a straightforward manner, a discussion 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, is the Converter. The converter can be made up of six diodes, which act like check valves used in plumbing systems. They enable current to circulation in only one direction; the direction demonstrated by the arrow in the diode symbol. For example, whenever A-phase voltage (voltage is comparable to pressure in plumbing systems) is more Variable Speed Electric Motor positive than B or C phase voltages, then that diode will open and invite current to stream. When B-phase becomes more positive than A-phase, then the B-phase diode will open and the A-stage diode will close. The same holds true for the 3 diodes on the negative part of the bus. Thus, 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 operates in a similar style to a reservoir or accumulator in a plumbing program. This capacitor absorbs the ac ripple and delivers a clean dc voltage. The AC ripple on the DC bus is normally significantly less than 3 Volts. Thus, the voltage on the DC bus turns into “approximately” 650VDC. The real voltage will depend on the voltage degree of the AC range feeding the drive, the level of voltage unbalance on the power system, the electric motor load, the impedance of the power system, 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 distinguish it from the diode converter, it is normally known as an “inverter”.
In fact, 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.