Windmill

A windmill is a machine that is powered by the energy of the wind turbines . It is designed to convert the energy of the wind into more useful forms using rotating blades or sails. The term also refers to the structure it is commonly built on. In much of Europe, windmills served originally to grind grain (hence the "mill" derivation), though later applications included pumping water and, more recently, generation of electricity. Contemporary electricity-generating versions are referred to as wind turbines.

In northwestern Europe, the horizontal-shaft or vertical windmill (so called due to the dimension of the movement of its sails) dates from the last quarter of the 12th century in the triangle of northern France, eastern England and Flanders. Joseph Needham states that the earliest known reference came in 1191 by a Dean Herbert of East Anglia, who supposedly competed with the mills of the abbey of Bury St Edmunds. These earliest windmills were used to grind cereals. The evidence at present is that the earliest type was the post mill, so named because of the large upright post on which the mill¡¯s main structure (the "body" or "buck") is balanced. By mounting the body this way, the windmill is able to rotate to face the (variable) wind direction; an essential requirement for windmills to operate economically in North-Western Europe, where wind directions are various. By the end of the thirteenth century the masonry tower mill, on which only the timber cap rotated rather than the whole body of the mill, had been introduced. In the Netherlands these stone towerlike mills are called "round or eight-sided stone stage mills, ground-sailers (windmills with sails reaching almost down to the ground), mound mills, etc." (Dutch: ronde/achtkante stenen stelling molens, grond-zeilers, beltmolens, etc.). Dutch tower mills ("torenmolens") are always cylindrical (such as atop castle or city wall towers). Because only the cap of the tower mill needed to be turned the main structure could be made much taller, allowing the sails to be made longer, which enabled them to provide useful work even in low winds. Such mills often have a small auxiliary set of sails called a fantail at the rear of the cap and at right angles to the sails; this rotates the cap through gearing so the sails face into the wind.

Model:H3.1-1000W Windmill
Name: Windmill
Feature:Hummer 1kw windmill can drive Color TV ,refrigerator ,Pump etc , it well used in housing ,telecommunications station ,TV transfer station ,monitoring ...

Model:H2.7-500W Windmill
Name: Windmill
Feature:  Hummer 500w windmill equipped with wind-solar hybrid sine wave controller system . Our controller system are three-in -one design with the...

Model:H9.0-20KW Windmill
Name: Windmill
Feature:  Hummer 20kw Windmills which feature high efficiency and low rated wind speed introducing several patented technologies and some special materia...

Model:H1.25-400W
Name: wind turbine
Feature:Hummer H1.25-400w wind-solar hybrid power system is an innovative?environmentaly source, It is cost effective and simple to install,H1.25-400w wind-solar hybrid power system is a new concept in amenity lighting designed?for the 21st Century providing illumination at almost any location remote from the grid electricity supply

Model:H8.0-10000W
Name: wind turbine
Feature:Hummer H8.0-10000w Wind Generator which features high efficiency and low rated wind speed introducing several patented technologies and some special materials.By using most advance charging module , the energy loss drops to the minimum extent

Model:H9.0-20000W
Name: wind turbine
Feature:H9.0-20000W is a typical HUMMER smart Wind turbine ,which with a series of high-end technologies and refined material ,H9.0-20000W wind turbine is excellent in generation ,stable in output and reliable in practice.

Model:H10.0-30000W
Name: wind turbine
Feature:H10.0-30000W wind turbine generator is controlled by a comprehensive smart system. Through our years of monitoring on wind turbine operation, we successfully develop an automatic control system for small and medium scaled wind turbines.

Model:H12.0-50000W
Name: wind turbine
Feature:Hummer generator is one of the most advanced generators in the world. Made of refined permanent magnetic material, special copper alloy, aviation aluminum alloy and stainless steel, it is highly efficient in power. Due to its smallness, it is able to be placed inside the nose cone to reduce air resistance and increase efficiency.

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