Some 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 also have slice 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 enhance their revenues by as much as $1 million a calendar year by selling surplus capacity 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 an individual stage, valve elimination, and energy saving. To achieve these benefits, however, extra care must be taken in selecting the appropriate system of pump, motor, and electronic electric motor driver for optimum interaction with the procedure system. Effective pump selection requires understanding of the full anticipated range of heads, flows, and specific gravities. Motor selection requires suitable thermal derating and, sometimes, a complementing of the motor’s electrical characteristic to the VFD. Despite these extra design considerations, variable velocity pumping is now well accepted and widespread. In a simple manner, a conversation is presented about how to identify the benefits that variable rate offers and how to select elements for trouble free, reliable operation.
The first stage of a Adjustable Frequency AC Drive, or VFD, may be the Converter. The Variable Speed Motor Converter is usually made up of six diodes, which are similar to check valves used in plumbing systems. They allow current to movement in only one direction; the direction shown by the arrow in the diode symbol. For instance, whenever A-phase 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 up and invite current to flow. When B-phase turns into more positive than A-phase, then your B-phase diode will open up and the A-phase diode will close. The same is true for the 3 diodes on the negative aspect 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 with the addition of a capacitor. A capacitor operates in a similar style 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 normally significantly less than 3 Volts. Thus, the voltage on the DC bus becomes “approximately” 650VDC. The real voltage will depend on the voltage level of the AC range feeding the drive, the amount of voltage unbalance on the energy system, the engine 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 known as a converter. The converter that converts the dc back to ac is also 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 larger EVER-POWER power and automation offerings that help customers use electricity effectively and increase productivity in energy-intensive industries like cement, metals, mining, coal and oil, power generation, and pulp and paper.