A few of the improvements attained by EVER-POWER drives in energy effectiveness, productivity and process control are truly Variable Speed Electric Motor remarkable. For example:
The savings are worth about $110,000 a year and also 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 become self-sufficient producers of electrical energy and boost their revenues by as much as $1 million a yr by selling surplus capacity to the local grid.
Pumps operated with variable and higher speed electric motors provide numerous benefits such as greater selection of flow and head, higher head from a single stage, valve elimination, and energy saving. To attain these benefits, however, extra care must be taken in selecting the appropriate system of pump, electric motor, and electronic electric motor driver for optimum conversation with the procedure system. Effective pump selection requires understanding of the complete anticipated selection of heads, flows, and specific gravities. Engine selection requires suitable thermal derating and, sometimes, a complementing of the motor’s electrical feature to the VFD. Despite these extra design factors, variable velocity pumping is now well approved and widespread. In a simple manner, a debate is presented about how to identify the benefits that variable swiftness offers and how exactly to select components for trouble free, reliable operation.
The first stage of a Adjustable Frequency AC Drive, or VFD, may be the Converter. The converter can be comprised of six diodes, which act like check valves used in plumbing systems. They allow current to stream in mere one direction; the path demonstrated by the arrow in the diode symbol. For instance, whenever A-phase voltage (voltage is comparable to pressure in plumbing systems) is certainly more positive than B or C stage voltages, then that diode will open and invite current to stream. When B-phase becomes more positive than A-phase, then the 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 eliminate 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 program. 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 will depend on the voltage degree of the AC series feeding the drive, the level of voltage unbalance on the energy system, the electric motor 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, is sometimes 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 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, oil and gas, power generation, and pulp and paper.