High Quality Variable-frequency drive-lx3100_01

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A variable-frequency drive (VFD) (also termed adjustable-frequency drive, variable-speed drive, AC drive, micro drive or inverter drive) is a type of adjustable-speed drive used in electro-mechanical drive systems to control AC motor speed and torque by varying motor input frequency and voltage.

VFDs are used in applications ranging from small appliances to the largest of mine mill drives and compressors. However, around 25% of the world's electrical energy is consumed by electric motors in industrial applications, which are especially conducive for energy savings using VFDs in centrifugal load service,[5] and VFDs' global market penetration for all applications is still relatively small. That lack of penetration highlights significant energy efficiency improvement opportunities for retrofitted and new VFD installations.

Over the last four decades, power electronics technology has reduced VFD cost and size and has improved performance through advances in semiconductor switching devices, drive topologies, simulation and control techniques, and control hardware and software.

VFDs are available in a number of different low- and medium-voltage AC-AC and DC-AC topologies.

System description and operation

VFD system

A variable-frequency drive is a device used in a drive system consisting of the following three main sub-systems: AC motor, main drive controller assembly, and drive/operator interface.

AC Motor

The AC electric motor used in a VFD system is usually a three-phase induction motor. Some types of single-phase motors can be used, but three-phase motors are usually preferred. Various types of synchronous motors offer advantages in some situations, but three-phase induction motors are suitable for most purposes and are generally the most economical motor choice. Motors that are designed for fixed-speed operation are often used. Elevated-voltage stresses imposed on induction motors that are supplied by VFDs require that such motors be designed for definite-purpose inverter-fed duty in accordance with such requirements as Part 31 of NEMA Standard MG-1.

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Q:which of the followingf organintions would maintain records of tested electrical equipment?
Think logical, and what each organization does or stands for. Good luck.
Q:How do I get rid of ghosts in my house?
sprinkle holy water, and pray Catholic exorcism prayer.
Q:Can I modify my UPS to work with a different Ah battery?
Q:What other kind of equipment is involved in Electrical Engineering besides the test and measurement equipment?
I grew up working from a block diagram . It is good to have some good programs to do the work for U. Learn the test equipment well as some times u can be tricked that there is a problem when there is not. Communications was good to me.
Q:Can you be electrocuted in mid air when you touch a live wire only?
No. Your comment about a complete circuit is correct. Under the conditions you state you will not be electrocuted. One exception would be if the line frequency and voltage was high and you had substantial capacitance to ground you might be electrocuted.
Q:What happens when you have reverse electrical polarity?
Hmmmm The only approach to comprehend for sure if that fried the the circuits could be to check out it out with the proper adapter. I would now not use the adapter with the overrated voltage, why danger it extra? Just take the one you firstly used, reduce the output cable and splice the wires collectively the opposite method to reverse the polarity of the plug. That would clear up your main issue.
Q:Can I use Orange electrical outlets for regular things?
Yes, the orange receptacle. is for isolated ground use but if you connect a wire from the ground wire to the metal box or other metal parts and also to the green screw on the outlet you have made it like a normal outlet (the ground is no longer isolated).
Q:does an electrical engineer operates on steam turbine or jet engine (or helps in its design)?
Turbine engines (either steam of fuel-injected) are mechanical parts and not electrical parts. A electrical engineer will be working on the generator that is attached to this systems. They will also work on the transmission of that power (Transformers and all that good stuff!).
Q:Household wiring question?
No, they do not make a general purpose receptacle that is rated 30 amps, 15 and 20 amps only. If for some unknown reason you must install 30 amp receptacles, you'll have to use a receptacle with a different configuration. I guess if you have a house full of dryers and nothing else it would work.
Q:How is the electrical maximum demand?
Sorry Sparky its not that type of maximum demand. Max demand on a UK electricity bill is determined as follows UK industrial tariffs are generally measured on a 1/2 hour basis that is the 24 hour day is split into 48 1/2 hour segments during the annual period of increased demand September to March the electricity company records your usage for each 1/2 hour segment in KWH the highest KWH in any 1/2 period between september and March is your maximum demand charge This will be a time when most or all of your electrical equipment is on together drawing the maximum power consumption. If you have an old analogue type meter it has a max demand needle that displays the up to date maximum demand figure if in the next 1/2 hour period you exceed this value the needle will be pushed up to this higher value and will not reset. The next high demand period if greater than previous will again push the needle up to a new maximum value. At the end of march or end of max demand period the highest 1/2 hour figure will be used in your bill.

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