Some of the improvements attained 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 have cut the company’s annual carbon footprint by 500 metric tons.
EVER-POWER medium-voltage drive systems enable sugar cane vegetation throughout Central America to be self-sufficient producers of electricity and boost their revenues by as much as $1 million a 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 head, higher head from a single stage, valve elimination, and energy saving. To attain these benefits, nevertheless, extra care must be taken in selecting the correct system of pump, motor, and electronic engine driver for optimum interaction with the procedure system. Successful pump selection requires understanding of the full anticipated range of heads, flows, and specific gravities. Engine selection requires appropriate thermal derating and, sometimes, a matching of the motor’s electrical feature to the VFD. Despite these extra design factors, variable acceleration pumping is now well accepted and widespread. In a simple manner, a dialogue is presented about how to identify the huge benefits that variable velocity offers and how to select parts for hassle free, reliable Variable Speed Electric Motor operation.
The first stage of a Variable Frequency AC Drive, or VFD, is the Converter. The converter is certainly made up of six diodes, which act like check valves used in plumbing systems. They allow current to circulation in only one direction; the direction shown by the arrow in the diode symbol. For example, whenever A-phase voltage (voltage is comparable to pressure in plumbing systems) is more positive than B or C phase voltages, then that diode will open and allow current to flow. 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 is true for the 3 diodes on the negative part 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 system. This capacitor absorbs the ac ripple and delivers a soft 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 level of voltage unbalance on the power system, the engine load, the impedance of the power program, and any reactors or harmonic filters on the drive.
The diode bridge converter that converts AC-to-DC, may also be just known as a converter. The converter that converts the dc back again to ac can be a converter, but to distinguish it from the diode converter, it is generally referred to as an “inverter”.
Actually, drives are a fundamental element of much larger EVER-POWER power and automation offerings that help customers use electrical energy effectively and increase productivity in energy-intensive industries like cement, metals, mining, coal and oil, power generation, and pulp and paper.