LI XIANG Variable-frequency drive-lx3000-01

LI XIANG Variable-frequency drive-lx3000-01 System 1

LI XIANG Variable-frequency drive-lx3000-01

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Loading Port:: Ningbo

Payment Terms:: TT OR LC

Min Order Qty:: 1 unit

Supply Capability:: 10 unit/month

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Energy savings

Many fixed-speed motor load applications that are supplied direct from AC line power can save energy when they are operated at variable speed by means of VFD. Such energy cost savings are especially pronounced in variable-torque centrifugal fan and pump applications, where the load's torque and power vary with the square and cube, respectively, of the speed. This change gives a large power reduction compared to fixed-speed operation for a relatively small reduction in speed. For example, at 63% speed a motor load consumes only 25% of its full-speed power. This reduction is in accordance with affinity laws that define the relationship between various centrifugal load variables.

In the United States, an estimated 60-65% of electrical energy is used to supply motors, 75% of which are variable-torque fan, pump, and compressor loads. Eighteen percent of the energy used in the 40 million motors in the U.S. could be saved by efficient energy improvement technologies such as VFDs.

Only about 3% of the total installed base of AC motors are provided with AC drives. However, it is estimated that drive technology is adopted in as many as 30-40% of all newly installed motors.

An energy consumption breakdown of the global population of AC motor installations is as shown in the following table:

Global population of motors, 2009
	Small	General Purpose - Medium-Size	Large
Power	10W - 750W	0.75 kW - 375 kW	375 kW - 10000 kW
Phase, voltage	1-ph., <240V	3-ph., 200V to 1kV	3-ph., 1kV to 20kV
% total motor energy	9%	68%	23%
Total stock	2 billion	230 million	0.6 million

Control performance

AC drives are used to bring about process and quality improvements in industrial and commercial applications' acceleration, flow, monitoring, pressure, speed, temperature, tension, and torque.

Fixed-speed loads subject the motor to a high starting torque and to current surges that are up to eight times the full-load current. AC drives instead gradually ramp the motor up to operating speed to lessen mechanical and electrical stress, reducing maintenance and repair costs, and extending the life of the motor and the driven equipment.

Variable-speed drives can also run a motor in specialized patterns to further minimize mechanical and electrical stress. For example, an S-curve pattern can be applied to a conveyor application for smoother deceleration and acceleration control, which reduces the backlash that can occur when a conveyor is accelerating or decelerating.

Performance factors tending to favor the use of DC drives over AC drives include such requirements as continuous operation at low speed, four-quadrant operation with regeneration, frequent acceleration and deceleration routines, and need for the motor to be protected for a hazardous area. The following table compares AC and DC drives according to certain key parameters:

Drive type	DC	AC VFD	AC VFD	AC VFD	AC VFD
Control platform	Brush type DC	V/Hz control	Vector control	Vector control	Vector control
Control criteria	Closed-loop	Open-loop	Open-loop	Closed-loop	Open-loop w. HFI^
Motor	DC	IM	IM	IM	Interior PM
Typical speed regulation (%)	0.01	1	0.5	0.01	0.02
Typical speed range at constant torque (%)	0-100	10-100	3-100	0-100	0-100
Min. speed at 100% torque (% of base)	Standstill	8%	2%	Standstill	Standstill (200%)
Multiple-motor operation recommended	No	Yes	No	No	No
Fault protection (Fused only or inherent to drive)	Fused only	Inherent	Inherent	Inherent	Inherent
Maintenance	(Brushes)	Low	Low	Low	Low
Feedback device	Tachometer or encoder	N/A	N/A	Encoder	N/A

Q:I'm currently doing a 3 year advanced diploma for electronics engineering program. However, I don't feel it could really lead to much possibilities. What do people think?Are there any electronics engineers here in the room?? If so, what challenges do you face??: It's pretty booming right now, and probably will be for the next couple of decades at least. As far as possibilities go, what are you looking for? Some EE's start their own companies and make millions. It's as much as what you make of things as it is about hopping on the right train to take you where you want to go. The downside of engineering has to be the pressure and the deadlines. Marketing and money drive engineering. And the market doesn't want to wait forever for the next gismo. Your design has to be finished by a certain time or else the whole bridge project gets held up, etc.

Q:Dose that means amount of joules of energy consumed in 1 sec or an hour.: a watt is how much power an electrical Appliance will draw. current x voltage will give you what power is required. e.g. if ur appliance runs at 230v and is rated for 10amps then it will be rated at 2300watts. This is what electric companies use to see how much to charge you as they will charge by the KWatt per hour. 1 watt 1 joule per second

Q:EMP Electromagnetic Pulse: The EMP has the capacity to damage electrical equipment regardless of the source powering the electrical equipment, especially now that power generation devices depend heavily on sensitive microelectronics.

Q:Can I use GB electrical equipment in Ukraine? If not what adaptor do I need to be able to use it?: Ukranian okorder

Q:I think that I might have opened a portal into another world. Yesterday I heard a recording off of the internet that didn't exist! Weird. Also, I have been hearing voices and sounds coming from the room where I think that the portal was opened. I am so freaked out. I have a lot of excess electrical equipment in this room and I feel a little bit uncomfortable with that. I'm wondering if the equipment is making me feel weird too. Does anyone have a similar experience? What should I do? I don't want to hang out with spirits!: sprinkle holy water, and pray Catholic exorcism prayer.

Q:examples of electrical equipment in which insulators and conductors are used.and give reasons for their usethxthe one that answers will get 10 points: insulators are used on wires and places you don't want electricity to flow conductors are used in circuit boards and almost every electrical component. conductors are used to carry the flow of electricity.

Q:I have a school project (Construction management) that involves the estimating of the electrical cost for a building addition. I can do the fixture counts, equipment hook ups, box counts, switches and etc. I cant figure out how much wiring would be involved. from the blueprints, is there a way to measure (estimate) the lf of wiring? this is a school building so there are mostly medsize room and hallways. any help would be great. I remember something about the homerun count from when i was a laborer, but could i figure 1 line around the room with a line for fixtures or something like that. doesnt have to be perfect by any means.: You aren't giving anything even close to enough info for an estimate.If you have set of plans you would have to go to the electrical specs. and find out what needs to be included. ie; additional panels,increased service from electric co., computer class rooms, fire alarm, wiring in conduit.the list goes on and on, your not just adding a few lights and outlets., what about HVAC that all requires elect. Good luck!

Q:and can they be prosecuted? (UK): Most electrical or electronic equipment is governed by a user honesty system where if the interfere with other equipment they are required to fix it. Especially if it is ham radio or CB radio. If it is a sewing machine or other home electrical item ring your communications dept. and they will take care of it. Sewing machines can be quite noisy as far as signals and interference go. As far as prosecution is concerned, that won't be up to you. The relevant dept will make that call based on what sort of equipment they are using. I think you should find out which dept. is in charge of radio signals and the like and talk to them. Good luck VK3FMPB

Q:After being around him I noticed and so did he that lights turn off as he passes them, and every time he would come in my bedroom my light bulbs would blow out. Sometimes when we kiss he shocks my lips a little and doesn't notice it.Okay don't think I'm weird but I was researching such unusual phenomena and I noticed people mentioning alien abductions and that people who were abducted and DON'T remember it (because nobody does) will have a weird relationship with electrical devices, including disrupting the connection by being around them.Anyone want to talk about such things? Interesting.: You should post a video. Have your boyfriend walk into a public building and blow out the bulbs. It would go viral in an instant. He would make himself eligible for any of the worldwide paranormal challenges. He's going to need the cash when incandescent bulbs go the way of the dinosaur. Those fluorescent bulbs are pricey.

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