Some of the improvements achieved by EVER-POWER drives in energy efficiency, Variable Speed Electric Motor productivity and procedure control are truly remarkable. For example:
The savings are worth about $110,000 a year and also have slice the company’s annual carbon footprint by 500 metric tons.
EVER-POWER medium-voltage drive systems allow sugar cane vegetation throughout Central America to be self-sufficient producers of electrical energy 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 selection of flow and mind, higher head from an individual stage, valve elimination, and energy conservation. To attain these benefits, however, extra care must be taken in selecting the correct system of pump, electric motor, and electronic electric motor driver for optimum interaction with the process system. Effective pump selection requires understanding of the complete anticipated selection of heads, flows, and specific gravities. Motor selection requires appropriate thermal derating and, sometimes, a coordinating of the motor’s electrical feature to the VFD. Despite these extra design factors, variable acceleration pumping is becoming well accepted and widespread. In a simple manner, a debate is presented on how to identify the benefits that variable rate offers and how exactly to select parts for trouble free, reliable operation.
The first stage of a Adjustable Frequency AC Drive, or VFD, is the Converter. The converter is made up of six diodes, which act like check valves used in plumbing systems. They enable current to movement in only one direction; the path 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, then that diode will open and invite current to flow. When B-stage becomes more positive than A-phase, then the B-phase diode will open up and the A-stage diode will close. The same holds true for the 3 diodes on the negative part of the bus. Hence, we obtain 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 fashion to a reservoir or accumulator in a plumbing system. This capacitor absorbs the ac ripple and delivers a clean dc voltage. The AC ripple on the DC bus is normally less than 3 Volts. Thus, the voltage on the DC bus becomes “approximately” 650VDC. The actual voltage depends on the voltage level of the AC range feeding the drive, the level of voltage unbalance on the power system, the motor 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 tell apart it from the diode converter, it is generally known as an “inverter”.

In fact, drives are a fundamental element 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.