A few of the improvements attained by EVER-POWER drives in energy efficiency, 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 systems allow sugar cane plants throughout Central America to be self-sufficient producers of electricity and increase their revenues by as much as $1 million a yr 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 conservation. To achieve 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 process system. Effective pump selection requires understanding of the full anticipated selection of heads, flows, and specific gravities. Engine selection requires suitable thermal derating and, sometimes, a coordinating of the motor’s electrical characteristic to the VFD. Despite these extra design considerations, variable rate pumping is now well recognized and widespread. In a straightforward manner, a discussion is presented on how to identify the benefits that variable velocity 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 made up of six diodes, which are similar to check valves used in plumbing systems. They allow current to flow in mere one direction; the path proven by the arrow in the diode symbol. For instance, whenever A-phase voltage (voltage is similar to pressure in plumbing systems) is definitely more positive than B or C phase voltages, then that diode will open up and allow 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 holds true for the 3 diodes on the negative side of the bus. Hence, we get 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 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 turns into “around” 650VDC. The real voltage depends on the voltage level of the AC collection feeding the drive, the Variable Speed Electric Motor amount of voltage unbalance on the energy 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 known 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 usually known as an “inverter”.

Actually, 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.