A few of the improvements achieved by EVER-POWER drives in energy performance, productivity and procedure 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 Variable Speed Electric Motor systems allow sugar cane plant life throughout Central America to be self-sufficient producers of electrical energy and increase their revenues by as much as $1 million a year by selling surplus power to the local grid.
Pumps operated with variable and higher speed electrical motors provide numerous benefits such as greater range of flow and mind, higher head from a single stage, valve elimination, and energy saving. To accomplish these benefits, however, extra care must be taken in selecting the correct system of pump, motor, and electronic electric motor driver for optimum conversation with the process system. Successful pump selection requires knowledge of the full anticipated range of heads, flows, and specific gravities. Engine selection requires appropriate thermal derating and, at times, a matching of the motor’s electrical characteristic to the VFD. Despite these extra design factors, variable swiftness pumping is now well approved and widespread. In a straightforward manner, a conversation is presented about how to identify the benefits that variable rate offers and how to select components for trouble free, reliable 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 found in plumbing systems. They enable current to stream in only one 
direction; the direction proven 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, after that that diode will open up and invite current to flow. When B-phase turns into more positive than A-phase, then your B-phase diode will open and the A-stage diode will close. The same is 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 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 typically significantly less than 3 Volts. Therefore, the voltage on the DC bus becomes “around” 650VDC. The real voltage will depend on the voltage degree of the AC range feeding the drive, the level of voltage unbalance on the energy system, the electric motor 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 referred to as a converter. The converter that converts the dc back again to ac is also a converter, but to distinguish it from the diode converter, it is generally referred to as an “inverter”.
Actually, drives are an integral part of much bigger 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.