Some of the improvements attained by EVER-POWER drives in energy performance, productivity and process control are truly remarkable. For instance:
The savings are worth about $110,000 a year and have slice the company’s annual carbon footprint by 500 metric tons.
EVER-POWER medium-voltage drive systems allow sugar cane plant life throughout Central America to be self-sufficient producers of electricity 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 electrical motors provide numerous benefits such as greater selection of flow and mind, higher head from an individual stage, valve elimination, and energy conservation. To achieve these benefits, nevertheless, extra care must be taken in selecting the correct system of pump, electric motor, and electronic motor driver for optimum conversation with the procedure system. Successful pump selection requires knowledge of the complete anticipated selection of heads, flows, and particular gravities. Engine selection requires suitable thermal derating and, at times, a coordinating of the motor’s electrical feature to the VFD. Despite these extra design considerations, variable swiftness pumping is now well approved and widespread. In a simple manner, a debate is presented about how to identify the huge benefits that variable speed offers and how to select parts for hassle free, reliable operation.
The first stage of a Variable Frequency AC Drive, or VFD, is the Converter. The converter is usually made up of six diodes, which act like check valves found in Variable Speed Electric Motor plumbing systems. They allow current to circulation in mere one direction; the path proven by the arrow in the diode symbol. For example, whenever A-stage voltage (voltage is comparable to pressure in plumbing systems) is usually more positive than B or C stage voltages, after that that diode will open and invite current to flow. When B-phase 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 by adding 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 provides a soft dc voltage. The AC ripple on the DC bus is typically significantly less than 3 Volts. Thus, the voltage on the DC bus becomes “around” 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 power program, 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 again to ac is also 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 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.