variable speed electric motor

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 also have slice the company’s annual carbon footprint by 500 metric tons.
EVER-POWER medium-Variable Speed Electric Motor voltage drive systems enable sugar cane plant life throughout Central America to become self-sufficient producers of electricity and boost 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 electric motors provide numerous benefits such as for example greater range of flow and head, higher head from an individual stage, valve elimination, and energy saving. To accomplish these benefits, however, extra care must be taken in choosing the correct system of pump, engine, and electronic engine driver for optimum conversation with the process system. Effective pump selection requires knowledge of the complete anticipated range of heads, flows, and specific gravities. Motor selection requires appropriate thermal derating and, sometimes, a matching of the motor’s electrical characteristic to the VFD. Despite these extra design factors, variable rate pumping is now well approved and widespread. In a straightforward manner, a debate is presented on how to identify the benefits that variable acceleration offers and how exactly to select elements for trouble free, reliable operation.
The first stage of a Adjustable Frequency AC Drive, or VFD, is the Converter. The converter can be comprised of six diodes, which are similar to check valves found in plumbing systems. They allow current to stream in only one direction; the direction shown by the arrow in the diode symbol. For example, whenever A-phase voltage (voltage is similar to pressure in plumbing systems) is certainly more positive than B or C phase 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-phase diode will close. The same holds true for the 3 diodes on the negative part of the bus. Therefore, 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 operates in a similar style 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 typically significantly less than 3 Volts. Therefore, the voltage on the DC bus turns into “approximately” 650VDC. The actual voltage depends on the voltage level of the AC line feeding the drive, the level of voltage unbalance on the energy system, the engine 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 again to ac is also a converter, but to tell apart it from the diode converter, it is normally 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.

Tags:

Recent Posts