LI XIANG Variable-frequency drive-lx3000_02

LI XIANG Variable-frequency drive-lx3000_02 System 1

LI XIANG Variable-frequency drive-lx3000_02

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Generic topologies

Topology of VSI drive

Topology of CSI drive

Six-step drive waveforms

Topology of direct matrix converter

AC drives can be classified according to the following generic topologies:

Voltage-source inverter (VSI) drive topologies (see image): In a VSI drive, the DC output of the diode-bridge converter stores energy in the capacitor bus to supply stiff voltage input to the inverter. The vast majority of drives are VSI type with PWM voltage output.
Current-source inverter (CSI) drive topologies (see image): In a CSI drive, the DC output of the SCR-bridge converter stores energy in series-reactor connection to supply stiff current input to the inverter. CSI drives can be operated with either PWM or six-step waveform output.
Six-step inverter drive topologies (see image): Now largely obsolete, six-step drives can be either VSI or CSI type and are also referred to as variable-voltage inverter drives, pulse-amplitude modulation (PAM) drives, square-wave drives or D.C. chopper inverter drives. In a six-step drive, the DC output of the SCR-bridge converter is smoothed via capacitor bus and series-reactor connection to supply via Darlington Pair or IGBT inverter quasi-sinusoidal, six-step voltage or current input to an induction motor.
Load commutated inverter (LCI) drive topologies: In an LCI drive (a special CSI case), the DC output of the SCR-bridge converter stores energy via DC link inductor circuit to supply stiff quasi-sinusoidal six-step current output of a second SCR-bridge's inverter and an over-excited synchronous machine.
Cycloconverter or matrix converter (MC) topologies (see image): Cycloconverters and MCs are AC-AC converters that have no intermediate DC link for energy storage. A cycloconverter operates as a three-phase current source via three anti-parallel-connected SCR-bridges in six-pulse configuration, each cycloconverter phase acting selectively to convert fixed line frequency AC voltage to an alternating voltage at a variable load frequency. MC drives are IGBT-based.
Doubly fed slip recovery system topologies: A doubly fed slip recovery system feeds rectified slip power to a smoothing reactor to supply power to the AC supply network via an inverter, the speed of the motor being controlled by adjusting the DC current.

Control platforms

Most drives use one or more of the following control platforms:

PWM V/Hz scalar control
PWM field-oriented control (FOC) or vector control
Direct torque control (DTC).

Load torque and power characteristics

Variable-frequency drives are also categorized by the following load torque and power characteristics:

Variable torque, such as in centrifugal fan, pump, and blower applications
Constant torque, such as in conveyor and positive-displacement pump applications
Constant power, such as in machine tool and traction applications.

Q:I would like to start testing and reconditioning some electrical equipment and I'm wondering what device or devices I can use to out put a specified voltage/amperage either AC or DC.for instance I have an electric motor that needs 5v 20amps, and I require a device that would allow me to plug into a wall outlet and regulate the voltage and amps to the proper levels for testing this device.hopefully that makes sense, thanks: No, you cannot regulate voltage AND current at the same time. In your example, you apply a regulated 5 volts to the motor, and measure the current drawn, under load. It should be close to 20 amps. What you need are regulated DC power supplies to cover the range of the motors you are interested in. A regulated voltage supply with a current limit will do fine. Regulated AC supplies are more difficult, but I think all you need is an adjustable supply, for example, by use of an adjustable transformer (Variac) and other transformers to change the voltage, again, to the voltages of interest to you. .

Q:For eg in electricity board energy bills?: 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.

Q:I was thinking of making a video game collection, I allready have a big one but only containing systems and games with CDs. But no collection is complete without the retro NES or SNES or the old school consoles with cartridges. My question is where would be a good place to store them? Because god knows how difficult it is to find a complete set with the box and Manuel and everything so I'll have to deal with just buying the cartridge. If you could help out I greatly appreciate it!: you always wanna store any kind of electrical equipment in a cool dry place. when it comes to Nes stuff same thing, if you really wanna make sure they will be good to go use a tote container or plastic cooler. something with a sealable possibly water proof lids. i have all my nintendo stuff sitting in a red igloo cooler in my storage unit. it has been there for over three years now and nothing wrong. just make sure you use a qtip and some alcohol to clean the pins up nice before placing in any system. you dont wan any dust that might have collected to go inside your machines.

Q:I would like a serious answer from a professional who would know about these things from being part of the military or etc.When the air burst missile exploded, everything electrical stopped working. At the end of the movie, the girl asked if the phones are working and the guy replied Are you kidding, they'll never be phones again.Is that a true statement? Can anything electrical ever work again?? Or did he say that because the world at the time in their point of view looked unrepairable ?Also, if I was in a well constructed fallout shelter with all my stuff and I wanted to save Computers, TV etc. will it get affected from the outside air burst missile? (I know a lot of people are gonna yell why keep those when you can't use electricity again after a nuclear war 1, I just wanted to know, 2 I could use them in the shelter if I have Generator batteries for room lighting and everything else): You should be concerned about protecting yourself,not your toys.A well constructed shelter (fashionable in the 50's)would keep you out of the Blast(maybe)but would not save you from the Gamma rays.Everything would be contaminated for hundreds of generations.Nothing would grow,water would be undrinkable.When and if you emerge from your shelter,what and who would you find?Back to the Stone age.Have you seen the series on Discovery,Life after PeopleIt would be awful if you survived.

Q:I have a 1 inch plastic conduit and am running about 100 feet underground?: Running electrical wire and any other wiring in the same conduit is against electrical code. It is potentially dangerous and could cause damage to your equipment, shock hazards to the users, and possibly start a fire. Don't do it. Your insurance company wouldn't cover any damage from this illegal wiring.

Q:I'm a fresh grad licensed electrical engineer. Which field in electrical engineering job should i enter? for example, in construction, in manufacturing of electrical equipments in substations and the like, in distribution utilities/gencos.: refineries

Q:i have to identify whether it is civil or criminal or both and which specific area of law involved adn discuss the key issues which are likely to be raised in court - Amanda had bought and renovated a large house which was converted into student flats, because she was running short of money during the conversion, Amanda decided to buy some second-hand gas heaters which she serviced and installed herself, despite not being qualified to do so. unfortunately, one of the heaters malfunctioned, allowing poisonous fumes into on of the flats.One of the students, Boyd was killed.His girlfriend, Celia was made seriously ill and had to spend weeks in hospital.: both. one student killed as the result of an illegal installation of the heaters, and one seriously ill. Celia has a strong civil case as well. you might want to learn how to actually construct a proper sentence separated by periods and so forth.

Q:Can I use an existing outlet in basement that's uses 14/3 wire and tap off of it to wire up a bathroom with 14/3 for light . Fann And one gfci outlet ?: Bathroom receptacles should be on a seperate 20 amp circuit to permit devices like hair dryers. Same rules as a kitchen counter by a sink.

Q:If a 3 phase motor is driving a load say a gear box, compressor, or fan (Non Electrical piece of equipment) Does the load in this case gear box, compressor, or fan required a safety ground? The motor has its own safety ground: If there is no electrical connections to them then grounding is optional.

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