DE29723460U1 - Wind motor with one or more rotors - Google Patents

Description

-1-Description.

Wind engine with one or more rotors.

Wind motors (also called wind generators or wind turbines) are designed to convert the kinetic energy of the wind into usable energy by means of the aerodynamic effect of the rotor blades.

In order to achieve favorable efficiencies, the air flowing through the rotor surface of wind engines that correspond to the current state of the art must have as uniform a speed and direction as possible.

In order to be able to use the most uniform wind movement possible, wind engines are therefore mounted on high, expensive towers, which means that the costs of wind turbines that meet the current state of the art are higher than the energy yield justifies. The operation of such wind turbines is therefore only possible with appropriate subsidies. For smaller wind engines, the blade adjustment devices that are commonly used in large wind engines to adapt to different wind speeds are also uneconomical for cost reasons - the efficiency is thus further reduced.

The automatic adjustment of the rotor blades or the blade sections in the direction of the air flowing around the blade profiles according to the invention described enables

2£ now that wind engines can be operated almost loss-free even on lower masts despite uneven or gusty air movement and at different wind speeds.

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In the invention described, the radially arranged rotor blades or blade sections are mounted independently of one another so that they can rotate around their longitudinal axis, so that they rotate into the wind like OS wind vanes according to the movement of the air flowing around them, if the pivot point of the blade profile is in the aerodynamic pressure point, i.e. in the first quarter of the blade depth. (Fig. 1)

The wing profile used (e.g. a so-called S-profile used in flying wing aircraft) now generates lift in the direction of rotation when the air moves, causing the rotor to start to rotate, which then causes an increase in the flow velocity and lift and thus a further increase in speed until the load and the air resistance of the rotor blades limit the speed.
C Since the automatic adjustment of the rotor blades as a result of their wind vane effect largely compensates for uneven wind speeds, e.g. gusts of wind, profitable operation, even of smaller wind engines, is possible at different wind speeds near the ground or in other unfavourable topographical conditions.

In order to further reduce the pitch error that occurs when the speed or wind speed changes, the blades can be divided into independently rotating sections. (Fig. 2 - H)

The automatic adjustment of the rotor blades or the wing sections in the direction of the air flowing around the wing profiles can also be achieved by wind vanes similar to the horizontal stabilizer of an aircraft. (Fig. 5)

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Another way of adjusting the wings is to arrange wind vanes in front of the rotor blades or wing sections, if these wind vanes control gears for rotating the associated rotor blade or wing section, or if the negative or positive pressure on the upper or lower sides of the profile is determined by pressure sensors and the resulting values are used to control gears for adjusting the wings or wing sections. (Fig. 6 and 7) If the trailing edges of the profile are adjusted manually or by servo controls, similar to Fowler wings, or the wind vanes attached like a horizontal stabilizer, the lift can be changed or reduced to zero by adjusting accordingly, which makes it possible to change the load or speed, e.g. by controlling the speed. (Fig. 8 and 9) The same effects are also achieved if the adjustment is controlled by pressure sensors or by wind vanes in front of the profiles.
If the lift is reduced to zero manually or by an alarm circuit, this causes the rotor to stop. In order to improve the starting properties of wind motors with self-adjusting rotor blades, the rotation ranges of the rotor blades or blade sections can be limited.

Claims (1)

-i- Protection claims 1. Wind motor with one or more rotors, characterized in that its radially arranged rotor blades are mounted independently of one another so as to be rotatable about their longitudinal axis. 2. Wind engine according to claim 1), characterized in that The rotor blades adjust themselves independently of one another in the direction of the air flowing around the blades due to the wind vane effect of the blades, which are pivotally mounted at the pressure point of the blade profiles. • 3.
-JO wind motor according to claim 1), characterized in that the automatic adjustment of the rotor blades in the direction of the air flowing around the blades is carried out by wind vanes similar to the horizontal stabilizer of an aircraft. ti. Wind engine according to claim 1), characterized in that tö the adjustment of the rotor blades in the direction of the air flowing around the blades is carried out by mechanical adjustment devices which are controlled by wind vanes arranged in front of the profiles of the rotor blades or by pressure sensors mounted on the upper and lower surfaces of the blade profiles. 5. Wind motor according to protection claims 1) to Ii), characterized in that in order to reduce offset errors, the independently rotatable blades are divided into independently rotatable sections. 6. Wind engine according to claims 1), 2), 3) and 5), characterized in that the trailing edges of the rotor blades or blade sections or the attached wind vanes are adjusted manually or by means of a control system so that the -2-Angle of attack
the rotor blade or blade sections change, thereby causing a change in load and/or speed of the rotor. 7. Wind motor according to protection claims 1) to 6), characterized in that when adjusted according to protection claim k) or 6) by manual operation or alarm setting the lift can be regulated to zero, thus causing the rotor to come to a standstill. 8th. Wind motor according to protection claims 1) - 3), characterized in that, for example to improve the starting properties, the rotation ranges of the rotor blades or the blade sections can be limited.