Generator Blog

The LEAP-X style engine which is produced by CFM company is regarded as the first one of the third generation of civil aircraft engines, and it is composed of high pressure compressor, high pressure turbine and combustion chamber.

According to report, in recent days, American general electric company proclaims that they are considering offering aircraft engine to China’s undergoing research of civil large plane with group of seven summit in France. Now Chinese business aircraft enterprise is putting in a lot of energy in developing and manufacturing the newest single aisle aircraft which is called C919, and it chooses CFM’s engine as the only cooperative enterprise abroad, according to the estimation of Chinese business aircraft enterprise, in the following 20 years, there is a demand of approximate 2000 aircraft in global market, and CFM is committed to developing and manufacturing aircraft, now it has become one of the most successful aircraft enterprise in the world.

Here is the current research of developing LEAP-X style engine, at the present, the compress ratio of single-stage turbine in core machine is 16, at the middle of 2011, they will test the compress ratio of double-stage turbine and the initial stage of design should be done by the end of this year, then CFM will finally decide whether to choose single-stage turbine or not according to the analysis of data. CFM enterprise says that they want to have higher heat efficiency, and they increase that through the increase of core machine’s temperature, at the same time, ensure the efficiency of turbine and durability. They also want to do them best in the following aspects, firstly, compared with CFM56style engine which is assembled in Boeing 737 series airplane and Airbus A320 series airplane, the engine’s oil consumption of LEAP-X style engine reduced by 16%, if they combine new aircraft technology, the oil-consumption can be reduced more. Secondly, at the aspect of high bypass ratio in improving combustion efficiency, they try to increase it from 5.5 to 9, that is an amazing progress. Thirdly, decrease the weight of LEAP-X engine significantly. 

Electric motor is widely used in our daily life, without electric motor, we can barely live for months. People are becoming more and more dependent on using all kinds of electric motor to make our life easier and convenient.

Today we are going to talk about how to buy an agricultural single- phase electric motor. Agriculture is the foundation of Gross Domestic Product, in today’s China, there is still sixty percent of people farmers, so how to improve the yield of wheat, rice and all kinds of vegetable is an important and urgent problem which should be solved as soon as possible.

There are two tips for buying single-phase electric motor, firstly, we should choose the single-phase electric motor according to the spindle speed of agricultural machine. Generally, when the spindle speed of agricultural machine is high, we should consider buy double-stage single-phase electric motor, on the contrary, we should buy four-stage ones. Those high spindle speed machine, such as grind machine, centrifugal machine, seal machine and so on, we should choose two-stage single phase electric motor for it, and those machine which has low spindle speed such as squeezing machine, package machine, we should choose four-stage single phase electric motor for it.

Secondly, we should ensure the power of electric motor according its working load, for those machines which are engaged in machining of bean milk and machining of almond, we should choose single-phase electric motor whose power is between 800and 1100 W, we should consider buying double capacitance single-phase electric motor whose power is between 1500 and 2200W for machines which are engaged in grinding flour machine and squeezing oil machine, and so on. In order to realize various functions and exert the efficiency of agricultural machine, we should choose four-stage double capacitance motor whose power is 2200W; choose the electric motors which have good reputation and high quality; buy motors according to the rated current and current which circuit wire can take, the rated current on electric nameplate should be lower than rated current on board and circuit carrying current, if it is higher, then we can replace bigger electric board and thick wire; contact with agricultural machine manufacturer and ask them whether they can change for a new one.

Diesel generator is a small item of power generating device, it consumes diesel, and takes diesel motor as the prime motor to supply power to generator. The entire machine is generally composed of diesel motor, generator, control tank, combustion chamber, battery, protection device and other components. It can fixed on basic facility, or located, even for mobile use. Diesel generator belongs to these generating devices which can not work successively, if it has been working for twelve ours, its output power should be lower than rated power. Although diesel generator ahs low power, it is agile, convenient, and easy for operate and repair, so it is widely used by miner, railway, wild construction site, enterprise, hospital and so on.

In 1897s, the first diesel generator in the world is invented in Augsburg which is a province of Germany, and it is invented by Rudolf Diesel who is the founder of MAN enterprise, so the diesel motor is named as his name. MAN enterprise is still the biggest diesel generator manufacturer in the world, its generator can have a capacity of 15000KW, and it is the main power supplier in ocean shipping industry. Our country’s large-scale diesel generator depends MAN enterprise, such as Dongjiang electricity company in Guangzhou province, Fushan electricity company so on. Now the earliest diesel generator is still preserved in Germany’s national museum for exhibition. Now we’d like to introduce the working theory of diesel generator. In the combustion chamber of diesel motor, purified air which is filtered by air cleaning machine is well mixed with high compressed foggy diesel which is jetted through nozzle. Under the up-down compression of piston, the volume becomes smaller, and the temperature in the combustion chamber is rising so fast, when it reaches the burning point of diesel, the mixed air burns fiercely, and the volume expands, so it pushes piston down, in that way it makes the crank turning, because the alternative current generator is installed coaxially with crank, so when the diesel is turning, it drives the rotor of generator. Because of the electromagnetic induction, generator can output inductive voltage, and it runs through resistance, it will produce current.

The advantage of using diesel motor is that when the cost of fuel and working condition change, the change of fuel-consumption efficiency is flat. It is also famous for its reliability, durability, low poisonous air emission and wide range of use.

The generator group shoulders the burden of national economy and daily life’s electricity demand, in the future it will still play an important part for a long time. With the development of civilization and economy, the former generator group can not meet people’s need, so the trend of future generator group should be along low energy-consumption, environment protection, good looking appreance.

Nowadays diesel generator is widely used in daily life, so everyday we are involved in buying all kinds of diesel generators, but it is difficult for customers to buy a perfect diesel machine. This particle is focused on finding some tips for buying a perfect diesel generator.

Now the expert reminds customers to do the following things when buying a new generator, firstly, we should what band it is, secondly, we should know the manufacturing process, when we are testing the generator, we should watch whether the voltage and frequency is stable or not, whether the foundation of voltage is fast or not, whether the vibration is big or not, the size and color of engine’s smoke, and so on.

Here are the eight traps which we should consider when we are buying a new diesel generator.

1, we shouldn’t confuse the relation of KVA and KW. Sellers usually regard KVA as the overstatement of KW, and sell it to customers, actually, KVA is apparent power, and KW is efficient power, the equation is KVA=0.8*KW, generally, import generator group is using KVA as unit of power, but for domestic device, we use KW as a unit, so when we are calculating power, we should make 80% discount of KVA.

2, make a confusion between rated power and back-up power, when selling generators, seller only say “power”, and mistake back-up power for rated power on purpose, and sell it to customers. Actually, in generator machinery, we define that the power of diesel generator is larger than power of generator, because of the energy-consumption during the process. If seller sells it to customers for mistake, it will severely lower the life if machine group and bring high maintenance.

3, renew second-hand generator and sell it to customers, so when we buy it, we should caution and buy new one.

4, only tell the band of diesel generator, and do not tell customers the production place and the band of machine group, such as Sweden’s Volvo, Britain’s Stanford and so on, actually, any diesel generator group can not be fulfilled by one company, so customers should know the band and manufacturer of diesel generator.

5, do not talk about the band of diesel generator and generator, only talk about the price, that is absurd, which we should forbid.

6, do not talk about the condition of assembly, actually they are very important, which should be pointed in contract.

Nano technology is regarded as the newest technology in 21 century, we are experiencing high development both in theory and practice, large amounts of new nano material and components have been developed, and show unprecedented retrospect in biomedical, military and daily life, but a lot of researchers focus on developing nano component which has high sensitivity and high performance, few of them focus on power system under nano size, but the nano sensor which is used in biology and military has large demand for this system. Generally, the power of these sensors are directly or indirectly from battery, if these sensors can supply themselves with power ,and the size of component and power become smaller, that’s what scientist has been doing for a long time, but haven’t realized it yet.

The invention of nano generator is probably a new chapter in the development of nano technology, the reason is as followed, firstly, it realize the combination of semiconductor and piezoelectric for the first time, and make the foundation for exploring the physical law in this process, secondly, it offers the specific technical routine for the leap from nano component to nano system. The development and study of nano component is the most advanced area in contemporary nano technology, because nano component has small size component which can be minimized to nano stage, low energy consumption, high sensitivity which macro component doesn’t have. Thirdly, it makes the theoretical foundation for realizing the minimization of entire nano component’s working condition. Fourthly, it makes a new area for the application of sodium oxide, currently, there is a fiercely decrease in the quantity of the article which is about nano bar and nano wire, and how to apply these technology into new area is still a new challenge. Finally, sodium oxide  has the distinctive biodegradability and biocompatibility, so it is used to sensitive and micro system in human body.

Nano generator is the application of new nano technology which can afford itself energy, it uses distinctive method to gather energy from human body or external environment and supply it to nano component and system. It can turn mechanical movement energy( such as the movement of human body, the extension of muscle, the change of blood pressure), vibrate energy( such as sonic wave of ultrasonic wave and so on) and water pressure energy into electrical energy and supply it to nano component, this kind of nano generator offers the theoretical and practical foundation for nano robot and wireless nano component which can realize self-power supply function, but there is still a long way to go before the practical application of nano generator, so we should develop several nano wire at the first and develop key method and technology for different power at the same time, we should study the fatigue and life problem of nano wire, and how to change fluid energy and sonic wave into electricity efficiently through nano generator; we should solve the seal problem of nano generator and its interaction with different organism.

In a word, the invention of nano generator makes the foundation of realizing integrating nano component and actually nano system, and we look forward to the widely application of nano generator in biomedical, military and daily life.

Preface: scientist has produced soft power rubber, when fold it, it can transform eighty percent of mechanical energy into electrical power. We can use this kind of material to make shoes, clothing accessories, and daily used stuff, even we can implant it into body as power.

“This looks like a pair of shoes, actually it is a charger”, if we remake the movie nation-produced 007, maybe we will have this sentence in the movie, the shoes which is transformed into a fan in the movie has been out of date.

Now scientist has manufactured a kind of tiny generator which we can put it in the coat, fix it under the shoe pad, maybe years later, it is not that funny when we pull a piece of wire out of shoes and use it for charging mobile phone, nowadays with the development of micro technology and material, people can charge for device at any time.

At the early of 2008, professor Wang from Georgia university of science and technology makes a kind of material which can produce power, at the best case, this material can produce 80 MW at every square, under the microscope, we can see every group of electric material’s structure likes two curve cones, when the material is folded and shook, two cones are compressed together and produce electricity.

The theory for this generator is piezoelectric effect, just like lighter. In 1880s, curie and his brother found some crystal can transform between mechanical energy and electric energy. Now in our daily life, there is large amount of piezoelectric material, from quartz to small component in watch, from aerospace to deep ocean.

Piezoelectric material has a big family, they have the common aspect which is that the centre of electric charge is not always at the same position inside lattice, although it appears that it is neutral, but the micro deformation of shape can change the distribution of electric charge, and in macro aspect, it turns out to be current.

According to the assumption of Macarl, those devices which can product electricity with micro deformation can produce electricity through the deformation of lung when somebody is breathing, and they can supply power for pacemakers.

Now the researchers hasn’t tested the biological safety of this generator on animals yet, if it can charge for mobile phone or iPod, it can be counted as valuable products. With more and more low energy-consumption in electric device, we are becoming more and more reliable to portable equipment, this kind of soft generator can bring us more and more freedom in using portable equipment.

ABB will promote new series of wind generator with slip ring, this new product increases its performance through reinforcing the structure of rotor and modular design, and it will show up at 2010 Asia wind energy meeting which will be held in Beijing during the end of June.

In June of 2010, ABB enterprise which leads the electric and automatic technology areas in the world promotes new series of generator with slip ring in it, through introducing global double-feedback concept, the research of new style generator is based on method which is used by the main turbine machine producer since 1997, and the method is reliable and have high efficiency which is used all over the world.

The new style generator’s power range is between 1.5 and 2 MW, through using modular design, the device has strong match, and can be used at different kinds of double-feedback turbine generators which are currently popular, so it is perfect choice for the update of devices in wind turbine generator group. The production base can product generators with power, at the same time, ensure the quality and quantity, and the connection interface which is used to connect different turbine generators can be determined according to the demand of customers. We offer customers air cooling method and water cooling method, specially produce generators which the frequency is 60Hz for American market.

The design of New style generator’s rotor has acquired patent in America, the bottom of winding has the optimized supporting ring, which can bear high speed working condition, and can cool the device better and fast.

ABB enterprise is the reliable supporter of wind generator, has a good reputation, and is famous for producing generator, converter, all kinds of electric components in wind generating system. In the past thirty years, ABB enterprise has produced approximate 30000 wind generators. The advantage of this new wind generator is based on the experience of 100 years’ effort on manufacturing better generator.

This new generator will show up at this June in Beijing, at the same time, it will be sold to all over world in shanghai ABB enterprise.

Diesel oil generator and low noise diesel oil generator meet the national criteria GB2820-90 and some relative national criteria, and are widely used in post station, hotel, entertainment place, hospital, high-rise building which have strict request for low noise.

Low diesel oil generator group is composed of low noise work station, low noise automatic generator group, low noise bus station, low noise electricity station and so on. Low noise diesel generator has stable performance, reliable working condition, low emission, low diesel oil consumption and so on.

Here is the feature of low noise generator. 1, significant low noise performance, the up level of the noise value of generator group is 75 dB. 2, the structure of generator group is tight, have little occupation of  space, and the good looking appearance. 3, multi-layer shield prevent the noise from entering. 4, it has many channels which can compress air in or out to make noise reduce significantly. 5, combustion chamber can hold large volume of oil. 6, we can open the cover plate swiftly and quickly, and have easy maintenance.

 The feature of low noise generator group is listed as follow, when we keep a distance of one meter from the generator group, noise value can be reduced to 80 dB or less than 80 Db, the adjustment of steady-state voltage is between -5% and +5%, the adjustment of transient voltage is less than 20%, the adjustment of steady frequency is less than 5%, the  adjustment of transient frequency is between -10% and +10%, the adjustment of no-load voltage is more than 95%Un.

The parameter of technology of low noise generator group is listed as follow, the rated voltage is 400V, the rated turning speed is 1500r/min, the rated power is 50Hz.

The  first wind turbine generators rolled off the assembly line owned by GE Energy on May 10 at its factory in Nomura-Hai Phong Industrial Park in the northern city of Hai Phong.After a year of construction the factory is now ready for producing turbines generators for export.

The US$61 million plant, which is expected to create 500 jobs for local people, will export GE Energy’s turbines and services around the world.

The Hai Phong facility will provide an installation, maintenance and repair service for the components it produces.

GE Energy is a subsidiary of the global infrastructure, finance and media company General Electric, which employs more than 300,000 people worldwide.

Since 1960, GE Energy has provided technical support for a number of power generation projects in Vietnam. A recent survey shows that 8.6 per cent of Vietnam’s land mass is suitable for generating power from the wind.

Under a draft national power development strategy, currently being considered by the government, renewable energies will account for 5 per cent of the nation’s energy output by 2020, with wind and solar power accounting for half of all renewable energies.

ABB has introduced a new standard series of slip-ring generators designed to fit doubly fed wind turbines. The new generators cover the power range of 1.5 MW to 2 MW.

The standard base construction for different powers enables large-scale manufacturing, and the modular turbine interface connections can be changed to suit individual customers’ specifications, according to the company. Both air and water cooling are available, as is a 60 Hz version for North American installations.

Features of the new generator series include a patented rotor design with an optimized winding-end support ring.

An improved insulation level offers high-voltage peak integrity and allows the use of various types of converters, ABB says. The new design also incorporates minimized total harmonic distortion levels.