HOW SKYSTREAM WORKS

The Skystream 3.7 wind generator connects directly to your home. When the wind is blowing, your home is powered (in part) by Skystream; when it’s not, your home is seamlessly powered by your utility as usual. During periods of strong winds, Skystream can actually produce excess electricity. Depending on your utility, your meter could spin backwards—giving you credit for a later date.

Slip Generators for Wind Turbines

Manufacturers of electric motors have for many years been faced with the problem that their motors can only run at certain almost fixed speeds determined by the number of poles in the motor.
As we learned on the previous page, the motor (or generator) slip in an asynchronous (induction) machine is usually very small for reasons of efficiency, so the rotational speed will vary with around 1 per cent between idle and full load.
The slip, however is a function of the (DC) resistance (measured in ohms) in the rotor windings of the generator. The higher resistance, the higher the slip. so one way of varying the slip is to vary the resistance in the rotor. In this way one may increase generator slip to e.g. 10 per cent.
On motors, this is usually done by having a wound rotor, i.e. a rotor with copper wire windings which are connected in a star , and connected with external variable resistors, plus an electronic control system to operate the resistors. The connection has usually been done with brushes and slip rings, which is a clear drawback over the elegantly simple technical design of an cage wound rotor machine. It also introduces parts which wear down in the generator, and thus the generator requires extra maintenance

How Do Wind Turbines Work

This article covers the topic of "how do wind turbines work", in order to provide a greater understanding on this matter for all.

Firstly you should ask, well which kind of wind turbine are you talking about? as this can greatly affect your answer. It is significant to ask this question as the two main types of wind turbines are horizontal and vertical, and these use the wind in different ways regarding their power process.

Horizontal wind turbines are the more common design, and use angled propeller like blades to create friction when facing the wind, resulting in the spinning motion. The vertical turbine design uses the wind to spin on a center point on the ground, resulting in the whole construction spinning round.

The process of power generation is significantly similar in both designs. The construction only makes a difference in the position of the turbine and generator.

A good way of thinking about the basics of wind power is by comparing a wind turbine to an electric fan. An electric fan uses electricity to create the blowing motion (which is your wind), and a wind turbine works in the opposite direction, of using wind to blow the blades which creates the electricity.

So when the wind turbines blades are spinning, what happens next? Well the blades are attached to a long shaft (in horizontal wind turbines, pictured above). Inside the long pole, the shaft begins to turn which is connected to a generator, and this generates your power.

So there is the basic understanding of how wind turbines work. Wind power generation is a fairly simple process, and many people have had great success in building a home wind turbine from scratch. Wind power is seen as a very good source of natural energy, yet many people still prefer the convenience, and reliability of solar panels, when choosing a renewable energy source for their home.

Hummer Wind Generators Manufacturer

Hummer Wind Generators Manufacturer located in APEC High and New Technology Garden--Hefei National Hi-tech Development Zone, is a burgeoning private high technology enterprise in wind power, specially engaged in researching, producing and promoting of small-sized wind generator system, and providing solutions for building small-scaled wind power plants.

Hummer small-sized wind generator system is a high and new technical product integrating aerodynamics, new material, magnetism and automatic control. It has seven patents, four (two of which are global patents) on generator, two on structure, one on low wind start-up and one on electrical control. The main features and advantages of Hummer generator are ultra lightness (weighing only 1/5 of its similar products), small size, low wind start, fast generating, reliable speed-restricting and stable running, most of which are break through on small wind generator in the world. And Hummer wind generator is regarded as unique upgraded product of the traditional.

Our company has a powerful R&D team (consisting of experts enjoying government allowance) providing reliable force for product-upgrading & technical support. Holding the business philosophy of “good product, good sale and good service? the R&D team of two generations devoted themselves to wind power research for 28 years, having developed ultra light & high efficient Hummer small wind-generator system, concerning 7 nucleus technical patents with complete intellectual property rights. The manage team of the company have successful experience in production, marketing, service and consultation.

At present, our company has set up a advanced operating mechanism integrating manufacture, research and service, can annually produce about twenty thousand sets wind generator systems in various specifications, such as 350W,500W,1000W,2000W,5000W, 10000W,etc.Our company, holding her cultural principles of “team study, happy work, harmonious management, fast development?, aims to be the best manufacturer and service provider of ultra-light-small wind generators home and abroad, and is actively building "Hummer" a famous brand

Hummer’s products are mainly used in Inner Mongolia, Xinjiang, Qinghai, Guangdong, Guangxi, Jiangsu, Zhejiang, Fujian, Liaoling, etc. and in UK, Ireland, Spain, India , etc.These items are now in great demand and we have on hand many enquires from many countries ,especially in EU ,and are to the taste of them.

Hummer series are widely used in mountainous, pastoral, insular and other areas where electricity is usually short or lack; are used by fishing men, insular armies, telecommunication relay station, television relay station, meteorology station, highway maintains station, natural gas pipeline protection station, forest fire-fight unit, or be used to built small-scaled wind power plant, and so on.


Hummer Institute consists of the following four laboratories:

Beijing Beiyuan Generator Lab, Shenzhen Beidi Generator Lab, Anhui Lujiang Amorphous Magnet Lab, and Anhui Lujiang Permanent Magnet Lab.

The institute has a lot of achievements in the fields of amorphous soft magnetic materials, permanent magnetic materials, high and low speed generators; and obtains many patents in aspects of generator magnet circuit and generator structure, etc. The institute has an original deep research on the technology of cutting magnetic line.

Hummer has seven patents. Based on its leading technology, our Hummer generator is made in very small size. For example, our350W generator weighs only 5kg, which is about the weight of a flange used in traditional wind generator for fitting blade rotors. The forever magnetism centrifugal clutch developed by Hummer Research Institute really makes the small wind generator to start with gentle wind. The institute does a careful research on mechanical structure and controller to perfect the whole wind generator system.

Hummer Institute is vigorously researching better wind generators for better making use of wind power more efficiently.
if you want to more about us ,please visited:www.allwindenergy.com

Wind Power Electric Generator

Streamlined three-bladed glass fiber reinforced blades have the advantages of great intensity, fatigue resistance and high efficiency. The Hummer-patented generator characterizes its high efficiency and good low-speed-performance.
The speed regulating system adjusts automatically to wind speed. The whole system is easy to install and convenient to maintain. Controlling, inverting and discharging are integrated.
Main technical datas:
1.Rotor blade diameter:6.5
2.Numbers of blade:3
3.Start up wind speed:4m/s
4.Rated wind speed:10m/s
5.Rated output power:5000W
6.Output Voltage:AC 220V ?230V?340V ,DC 24V,36V,48V,etc
7.Height:10m
8.Generator Weight:70kg
Temperature of working surrounding::±45°C
if you want to more about wind generators ,please visite:http://www.allwindenergy.com/Wind_Power_Electric_Generator.htm

Propeller wind generator

A device for converting wind power to mechanical rotation with a propeller. This consists of an propeller perpendicular to the wind, the propeller usually having a means of stalling to reduce its wind resistance when the wind is extremely strong. The propeller is mounted on a tower. With small wind generators the tower height is usually at least twenty meters. In the case of large generators, the tower height is about twice as great as the propeller radius.

Power output from a wind generator is equal to the cube of the windspeed. For every double in windspeed, the capacity of wind generators increases eightfold. For a general rule, a wind generators are practical where the average windspeed is greater than 12 mph (19 kph).

For a given survivable wind speed, the mass of a propeller (calculated from volume) is proportional to approximately the cube of its length. Wind intercepted by the propeller is proportional to the square of its length. The maximum length of a propeller is limited by both the strength and stiffness of its material. Labor and maintenance costs increase slowly with increasing propeller size, so given all these factors, to minimize costs, wind farm propellers are basically limited by their material strength. One of the best construction material available in 2001 is graphite. Graphite enables propellers of a radius of about sixty meters to be built, enough to tap a few megawatts of power. Smaller propellers for generators with a limited purpose are often made of lightweight fiberglass.

Gyroscopic inertia is proportional to the velocity change in the masses of the rotating structure when pivoted. What this means is that for each blade on a propeller of a pivoting wind generator, its gyroscopic force is at a minimum when the blade is horizontal and at a maximum when the blade is vertical. So, in the case of a one or two bladed propeller, as the wind changes direction it tends to start pivoting as the blade is horizontal, stop pivoting when the blade is vertical, the stop and go action creating extra wear and tear on the machine. When there are three or more blades, there are always at least two blades that are not quite horizontal, so the gyroscopic inertia changes less, which makes for a smoother pivot.

There are a number of vibrations that decrease in peak intensity as the number of blades increases. Some of the vibrations, besides wearing out the machine, are also audible. However, fewer larger blades operate at a higher Reynolds number and are therefore more efficient. Also, the cost of the propeller increases with the number of blades, so the optimum number of blades turns out to be three.

Since a tower produces turbulence behind it, the propeller is usually placed in front. It is pointed into the wind with a fin on small machines and usually a servo on large machines. The propeller has to be placed a considerable distance in front and sometimes tilted up a small amount to ensure that the lower blade doesn't impact the tower. Downwind machines are occasionally built despite the problem of turbulence because they don't need an additional pointing device and in high winds, the blades can be allowed to bend which reduces their wind resistance.

Sails were originally used on the first windmills. Unfortunately they have a short service life. Also they have a relatively low lift to drag ratio which means that they turn the generator slowly, waste much of the avaliable wind power and have a large wind resistance for their power output, requiring a strong wind tower. For these reasons they were superseded with solid airfoils.

When a propeller is spun by the wind, it adds a rotation to the wind, wasting some of the wind's power. Counter rotating propellers can be used to reduce this loss.

When the counter rotating propellers are on the same side of the tower, the one in front is angled inwards slightly so as to never hit the rear one. They are either both geared to the same generator or one propeller is connected to the rotor and the other propeller is connected to the field windings. Counter rotating propellers geared together to the same generator need a complicated gear train which therefore has additional gearing losses. Counter rotating propellers connected to the rotor and stator are mecanically simpler; but, the field windings need slip rings which adds complexity, wastes some electricity and wastes some mecanical power.

Counter rotating propellers can be on opposite sides of the tower. In this case it is best that the one in back be smaller than the one in front and set to stall at a higher wind speed. This way, at low wind speeds, both turn and the generator taps the maximum proportion of the wind's power. At intermediate speeds, the front propeller stalls; but, the rear one keeps turning, so the wind generator has a smaller wind resistance and the tower can still support the generator. At high wind speeds both propellers stall, the wind resistance is at a minimum and the tower can still support the generator. This allows the generator to function at a wider wind speed range than a single propeller generator for a given tower. Putting helps pulls its side downwind. Since the rear propeller will be at a considerable distance behind the front propeller, it provides considerable leverage for a fin placed there, which along with the propeller which stalls at a higher wind speed being in back, means no servo is necessary to point the machine into the wind. To reduce sympathetic vibrations, the two propellers should have an irrational relative rate, the square root of two for instance. Overall, this is more complicated than the single propeller wind generator; but, taps more of the wind and can tap it at a wider speed range.

These devices were first used to pump water and mill grain, by the 1930's they were mainly used to generate electricity. The first propeller wind generators were placed atop brick towers, once high tensile steel was available they were placed atop open steel lattices, as aesthetics and durability became more important they were placed atop steel or reinforced concrete shells. Small ones are connected to the tower on the ground, then the tower is raised into position. For large ones, the generator is hoisted atop the tower and there is a ladder or staircase inside the tower to allow technicians to reach and maintain the generator.

Originally wind generators were built right next to where their power was needed. With the availability of long distance power transmission, wind generators are now often on wind farms in windy locations and huge ones are being built offshore. Since they're an inexpensive means of generating electricity they are being widely deployed, the main reason the world won't be covered with them is because they're an eyesore and a bit noisy.

Researchers make advances in wind energy generation

July 19, 2005 - Engineers at the University of Alberta have created a wind energy generator that they hope people will one day be able to use to power their own homes.

"We have developed a simple, reliable, controller for small scale wind energy generators that is cheaper than competing technologies," said Dr. Andy Knight, a professor in the U of A Department of Electrical and Computer Engineering and lead author of a paper on the subject published recently in IEEE Transactions on Energy Conversion.

The traditional problem with harnessing wind energy has been the high cost and the low return of energy, especially for small-scale generators, Knight explained. A particular problem is that the devices have been unable to convert any energy when winds fall below specific cut off speeds, and much energy is therefore wasted.

However, Knight's open loop control system can be built with a few, simple electronic components that are cheap and easy to find, use and repair. As well, Knight's system is able to transfer even light winds into electric energy.

Although Knight and his colleagues have not yet built anything that is ready to sell, they have designed and tested a generator that they are working to improve before they expect to apply for a patent and possibly bring it to market.

Current small-scale wind energy generators cost about $2,400 US and, on an average wind speed day, produce 5.2 kiloWatt-Hours per day, Knight said. According to Natural Resources Canada, the average household consumes between 34 and 67 kiloWatt-Hours per day.

Generally, current small-scale wind energy generators require wind speeds of at least 18 km/h to generate any power, but Knight's device could be used in low wind environments, such as the Edmonton, Alberta area, where the average wind is 10 km/h.

"But it wouldn't be something you'd put in your garden. Energy is already cheap and abundant in Edmonton, so it wouldn't be financially viable in the city," Knight said, adding that fast turning wind turbines in a small yard would create a hazard.

However, the generators could be used at remote locations outside of the city, where the power supply is more expensive and less abundant.

Based on the results of his ongoing work, Knight is hopeful that wind energy might one day become a clean, renewable, viable source of energy for everyone to use, which would counter the environmental damage occurring from our current use of fossil fuels as our main source for energy.

"My work is something that can make a small change, and it's probably a bunch of small changes here and there that will add up and one day have a big impact," he said.

University of Alberta

Dutch build towering wind turbines out at sea

By Alexandra Hudson

IJMUIDEN, Netherlands (Reuters) - There is no shortage of wind in the densely-populated Netherlands but there is a shortage of space and in a nation which likes its houses small and its gardens cosy, opposition to wind farms is immense.

That is why a new Dutch wind farm is being built so far out to sea it is barely visible on the horizon, reducing the visual impact of its 60 turbines to virtually nil whilst at the same time harnessing higher offshore wind speeds.

Offshore wind farms are likely to appear more and more frequently off European coastlines as governments seek to increase their use of renewable energy without angering their citizens by placing giant turbines on their doorsteps.

The 383 million euro ($522.3 million) Q7 wind park development, 14 miles from the Dutch North Sea coast, is the farthest offshore wind park anywhere in the world, and its developers Econcern and Eneco Energie say a further five to 10 such wind parks will likely follow in the next few years.

"Q7 will contribute enough electricity for 125,000 households, but it is also a learning process. We are learning how to build these wind farms, how to organize the supply chain, and how to manage and operate them," said Bernard van Hemert, one of the wind farm's engineering directors.

"Most campaigns against turbines are based around the noise and the visual impact, and these have been reduced by going offshore. It is more expensive to do it here than to do it on land, but we have all agreed we don't have enough space on land," said van Hemert.

Blessed with shallow sandy soils around their coastline, Dutch engineers say the foundations for the turbines can be hammered 82 feet into the ground in just a matter of hours, although there are myriad other challenges.

The proportions are breathtaking. The turbines extend about 320 feet from the ocean, with three sharp narrow blades, each 130 feet long.

It is hoped that when they start rotating in early 2008 they will cut carbon-dioxide emissions by 225,000 tonnes, helping the Dutch to meet a target of 20 percent renewable energy use by 2020.

Moss puts on a show in N.Y.

EAST RUTHERFORD, N.J. – Here was Randy Moss, sprinting down the north sideline at Giants Stadium, running like Al Davis was trying to catch him, past single coverage and into clear space.

There was Tom Brady, sitting behind a perfect wall of play-action protection, not the slightest concern a New York Jet might tackle him, all day to wait and wait for Moss to break free.

When Brady finally let it fly, Moss was cutting across the field, 50 yards deep now, blazing through three overmatched, lead-footed Jets. By the time the pass fell softly into Moss' oversized mitts, he only needed to step slightly up-field for six back-breaking, statement-making points.

"(Moss) just ran away from the defense," marveled Brady. "He ran about as far as I can throw it. I didn't have much more."

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If you thought playing the New England Patriots wasn't any fun the last six years, you should have seen them in this 38-14 show of force against what was supposed to be their chief AFC East rival.

Brady has a new favorite receiving toy, Moss has a new lease on his football life and the ever-churning New England machine has a new Vince Lombardi trophy in its sights.

The numbers told the story here at the Meadowlands, but the lasting impression wasn't so much from the final score.

It was nine receptions for 183 yards and one touchdown (Moss) and 22 for 28 passing for 297 yards and three touchdowns (Brady). It was 431 total yards and five different players finding the end zone.

But mostly it was No. 81, Moss, the off-season acquisition that has given Brady the deep threat he lacked last year. Some called it a gamble, coach Bill Belichick rolling the dice one two many times, risking his team on the shoulders of a surly, slowing star.

But so often what Belichick touches turns to gold, and freed from the misery of the Oakland Raiders, Moss didn't just run like the weight of the world was off his shoulders and he didn't just act like a good soldier, he had Brady calling him "a great leader," of all things.

"Randy's a competitor," Brady said. "Randy's a football player. He loves to play football. He was a great player before he got to the Patriots and he is obviously a great player now.

"I think he does want to fit in. Being a Patriot and being a part of this team, it's about being smart, being physical and putting the team first. That's why it's fun to play here."

Moss sure looked happy. There was no drama on the sideline, no waving for his quarterback's attention on the field. He may lack some of his trademark speed, but he makes up for it with experience, smarts and a new outlook.

"I'm just happy and very blessed to be in this position," he said. "I just wanted to showcase my talents."

He combined with Brady to put them on display. There were short routes, slants, jump balls and, of course, the bomb for the 51-yard touchdown. There was great physical skill and even greater mental understanding.

"He's a very smart player," Brady said. "He understands defenses; he understands what a quarterback is looking for."

Mostly there was an instant connection between pitcher and catcher – "Tommy had faith in me, believed in me," Moss said – that belie the fact that Moss missed most of training camp with a hamstring injury.

"(Brady) was like a kid with new toys, but he couldn't open them," Moss said of this new offense that included fellow wideout Wes Welker and a running game that churned out 134 yards but had been hampered by injury in the preseason. "He didn't really have all his toys to play with and now he has all his toys to play with. The sky's the limit."

Moss bristled at the idea he's rejuvenating his career here ("I don't need to revitalize. Everybody knows who I am."), but deep down he must know it. There was a reason, after all, he admitted to pregame nervousness.

His uneven career with Minnesota led to a pouting two-year stint with the Raiders, which, considering the dysfunction of that organization, can't be blamed completely on the player.

The one constant with Moss is an underestimated desire to win. If he has confidence in those around him, he'll bring it with the best of them. But he isn't going to waste energy for a loser. Just because he lacks that phony rah-rah act, just because he tells it like it is, for better or worse, doesn't mean he lacks heart.

By joining a franchise that has won three Super Bowls in the past six seasons, one famed for taking other team's troubles and turning them into team players, he no longer has an excuse. But surrounded by competence, he won't need one.

"This is probably the best well-coached team I've been on, and at the same time the best players and talent team I've been on," he said. "The whole circle, man, is the best. I'm just enjoying the ride and contribute to the team what I can."

"That's the way Randy plays," Belichick snapped postgame, with his trademark confidence that mocked those who doubted him.

You had to give Belichick his moment. He saw something a lot of others didn't. He believed what others wouldn't consider. And if he's correct, if this is indeed how Randy Moss plays, then Belichick may not just be laughing now, but laughing last.

Wind Generators

History of Wind generators
The first known wind generators were used in Persia as early as 200 B.C. and were used for for grinding grain. The same type of wind generators were later introduced into the Roman Empire by about 250 A.D. By the 14th century the dutch were using wind generators for pumping and as mills. By 1900 the dutch had about 2500 wind generators that produced an estimate peak power of about 30 mega-watts.

The first wind generator that was used for producing electricity was built in Cleveland, Ohio by Charles F. Brush in 1888, and in 1908 there were 72 wind-driven electric generators from 5 kW to 25 kW. By the 1930 wind generators were mainly used in remote areas to produce electricty as the electricity distribution grid was not widespread. The predecessor tp modern horizontal-axis wind generator was in service at Yalta, USSR in 1931. This was a 100 kW generator on a 30 m tower, connected to the local 6.3 kV electricty distribution grid. It was said to have an annual load factor of 32 per cent, which isnot much different from current wind generators.

Horizontal axis wind generators
Horizontal axis wind generators have the main rotor shaft and electrical generator at the top of a tower, and must be pointed into the wind. Small generators are pointed by a simple wind vane or tail. Large generators often use a wind sensor coupled with a servomotor. Most large wind generators use a gearbox, which turns the slow rotation of the blades into a quicker rotation that is more suitable for generating electricity.

A tower produces turbulence behind it, so the wind generator is usually pointed upwind of the tower. Blades for an upwind vertical axis wind generator are made stiff to stop the blades from being pushed into the tower by high winds. Downwind wind generators have been built, despite the turbulence, because they don't need an additional mechanism for keeping them in line with the wind, and at in high winds, the blades can be allowed to bend which reduces their swept area and thus their wind resistance. Because turbulence leads to fatigue failures and reliability very important for remote area power systems, most horizontal axis wind generators are upwind machines.

Vertical axis wind generators
Vertical axis wind generators have the main rotor shaft running vertically. The advantages of this configuration are that the generator and/or gearbox can be placed at the bottom, near the ground, so the tower doesn't need to support the additional weight, and that the generator doesn't need to be pointed into the wind. They generally also operate at lower wind speeds. However, they are not as efficient at extracting energy from the wind.

Wind Power Electric Generator

Features:
Streamlined three-bladed glass fiber reinforced blades have the advantages of great intensity, fatigue resistance and high efficiency. The Hummer-patented generator characterizes its high efficiency and good low-speed-performance.
The speed regulating system adjusts automatically to wind speed. The whole system is easy to install and convenient to maintain. Controlling, inverting and discharging are integrated.
Main technical datas:
1.Rotor blade diameter:3.8
2.Numbers of blade:3
3.Start up wind speed:3.5m/s
4.Rated wind speed:9m/s
5.Rated output power:2000W
6.Output Voltage:AC 220V ,30V,340V ,DC 24V,36V,48Vetc
7.Height:9m
8.Generator Weight:25kg
Temperature of working surrounding::±45°C

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Wind Turbine H2.5-350W

Streamlined three-bladed glass fiber reinforced blades have the advantages of great intensity, fatigue resistance and high efficiency. The Hummer-patented generator characterizes its high efficiency and good low--speed-performance.
The speed regulating system adjusts automatically to wind speed. The whole system is easy to install and convenient to maintain. Controlling, inverting and discharging are integrated.
Applied to
1 For daily life: Provide power at 12V DC, 24V DC, & 36V DC for lighting, TV, record players, driers,etc. in low-speeded wind areas especially in rural, pastoral and insular areas and as well as fishing-boats, railway depots, border sentry post, etc.
2 Provide 110V¡¢220V AC for color TV, small blowers, suitable for places distant from electricity network and places rich in wind power like pastoral, mountainous and insular areas.
3 Provide power unavailable from the normal 500W wind generator. Provide 220V AC and 24V DC & 36V DC for lighting, color TV, washing machines, refrigerators, pumps etc. Especially suitable for rural and pastoral areas and as well as border sentry post, meteorological observatory stations, etc.
Main technical datas
1 Rotor blade diameter: 2.5m
2 Numbers of blade: 3
3 Start up wind speed: 2.5m/s
4 Rated wind speed: 6.5m/s
5 Rated output power: 350W
6 Output Voltage: AC 110V,220V,DC 24V ,DC36Vetc.
7 Height: 5m
8 Generator Weight: 5kg
Temperature of working surrounding: ±45°C
The product partial pictures demonstration are as follows:

Wind power machine the whole machine structure

Generator machine head external appearance


Protection cover

Tail-wing

Generator
Control System
Hummer 350W Wind Generator Wind Speed¡ª¡ªOutput Power