A few of the improvements achieved by EVER-POWER drives in energy efficiency, productivity and process control are truly remarkable. For example:
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 vegetation throughout Central America to become self-sufficient producers of electricity and boost 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 electric motors provide numerous benefits such as greater range of flow and mind, higher head from an individual stage, valve elimination, and energy saving. To accomplish these benefits, nevertheless, extra care must 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 range of heads, flows, and particular gravities. Engine selection requires suitable thermal derating and, sometimes, a complementing of the motor’s electrical feature to the VFD. Despite these extra design considerations, variable velocity pumping is now well recognized and widespread. In a straightforward manner, a conversation is presented about how to identify the huge benefits that variable swiftness Variable Speed Motor offers and how to select parts for hassle free, reliable operation.
The first stage of a Variable Frequency AC Drive, or VFD, may be the Converter. The converter is definitely comprised of six diodes, which are similar to check valves used in plumbing systems. They allow current to flow in only one direction; the direction proven by the arrow in the diode symbol. For example, whenever A-phase voltage (voltage is similar to pressure in plumbing systems) is usually more positive than B or C phase voltages, then that diode will open up and allow current to stream. When B-stage turns into 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 get rid of 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 program. This capacitor absorbs the ac ripple and delivers a clean dc voltage. The AC ripple on the DC bus is typically less than 3 Volts. Thus, the voltage on the DC bus becomes “around” 650VDC. The actual voltage will depend on the voltage level of the AC range feeding the drive, the amount of voltage unbalance on the power system, the engine load, the impedance of the energy 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 can be a converter, but to tell apart it from the diode converter, it is normally 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 electrical energy effectively and increase productivity in energy-intensive industries like cement, metals, mining, coal and oil, power generation, and pulp and paper.