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WIND MOTORS
Definition statement
This subclass/group covers:

Mechanisms for converting the energy of wind into useful mechanical power.

In particular:

Wind motors with rotation axis substantially parallel to the flow of air entering the machine

Wind motors with rotation axis substantially at right angle to the flow of air entering the machine

Other wind motors

Controlling wind motors

Adaptations of wind motors for special use

Combinations of wind motors with apparatus driven thereby

Other details, component parts, or accessories of wind motors

Relationship between large subject matter areas

F03D covers mechanisms for converting natural wind energy into useful mechanical energy, and the transmission of such mechanical energy to its point of use. Electrical power generation aspects of wind motors (e.g. dynamo-electric conversion and electric generators) are classified in H02P. Arrangements or systems for supplying or distributing electric power are classified in H02J. Circuit arrangements or sy

References relevant to classification in this subclass
This subclass/group does not cover:
Circuit arrangements or systems for supplying or distributing electronic power
Control or regulation of electric generators, or dynamo-electric converters

Examples of places where the subject matter of this class is covered when specially adapted, used for a particular purpose, or incorporated in a larger system:

Electric propulsion of vehicles using wind power
Informative references
Attention is drawn to the following places, which may be of interest for search:
Vehicles for transportation
Rotors for airplanes and helicopters
Handling by cranes, hoisting, lifting
Machines or engines for liquids, Water turbines
Ventilators
Glossary of terms
In this subclass/group, the following terms (or expressions) are used with the meaning indicated:
Rotor
Wind engaging parts of the wind motor and the rotary member carrying them
Rotation axis
Axis of rotation of the rotor
Synonyms and Keywords

In patent documents the following expressions/words "wind turbine", and "windmill" are often used as synonyms.

In patent documents the following expressions/words "azimuth angle", and "yaw angle" are often used as synonyms.

In patent documents the following expressions/words "rotor hub", "rotor cone" and "spinner" are often used as synonyms.

Wind motors with rotation axis substantially in wind direction (controlling F03D 7/00)
Definition statement
This subclass/group covers:

Wind motors having their rotation axis substantially parallel to the flow of air entering the machine. When the flow has been guided into a direction other that the original wind direction, the final flow into the wind motor should be considered for classification.

References relevant to classification in this group
This subclass/group does not cover:
Controlling of wind motors
Informative references
Attention is drawn to the following places, which may be of interest for search:
Solar updraft
Wind motors with rotation axis substantially at right-angles to wind direction (controlling F03D 7/00)
Definition statement
This subclass/group covers:

Wind motors having their rotation axis substantially perpendicular to the flow of air entering the machine. When the flow has been guided into a direction other that the original wind direction, the final flow into the wind motor should be considered for classification.

References relevant to classification in this group
This subclass/group does not cover:
Controlling of wind motors
{with augmenting action, i.e. the guiding means intercepting an area greater than the effective rotor area (F03D 3/0463, F03D 3/049 take precedence) }
Definition statement
This subclass/group covers:

Wind motors characterised by the "effective area" of the rotor which is the cross section area of the rotor which contributes positively, i.e. causes a torque in/ to the desired rotation. The "augmenting" guiding means are those guiding means which intercept an area of flow greater than this "effective rotor area", and direct the flow into the rotor. The guiding means which fulfil this intercepting role are bounded on all sides from inlet to outlet into rotor, and therefore also accelerate or "concentrate" the flow into the rotor.

Example:

EP0226526

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$

GB2420831

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Special rules of classification within this group

When the guiding means form also a shield means on one side of the rotor F03D 3/0463 or F03D 3/049 take precedence.

{and only with concentrating action, i.e. only increasing the airflow speed into the rotor (F03D 3/0463 takes precedence) }
Definition statement
This subclass/group covers:

Wind motors with a concentrating means, i.e. the guiding means only increase the flow speed into the rotor without intercepting an area of flow greater than the effective rotor area (see definition of this effective area in F03D 3/0427 entry). These concentrating guiding means can be either bounded on all sides or only on some.

US1596373

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AU597755B (see channel 12)

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{the wind engaging parts having a cyclic movement relative to the rotor during its rotation}
Definition statement
This subclass/group covers:

Wind motors wherein the wind engaging parts, i.e. the blades, vanes, paddles or cups, undergo a change of orientation within each cycle of rotation of the wind rotor, coming back to their original position after each revolution. This change of orientation happens of itself, passively, the direct result of the wind acting on the wind engaging parts as the relative wind direction changes with the rotation.

Example:

WO2010102517

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{the cyclic relative movement being coupled to the movement of rotation; Controlling same, e.g. according to wind direction or force}
Definition statement
This subclass/group covers:

Wind motors whereby the cyclic movement of the wind engaging parts during each revolution of the rotor are forcibly and actively related to the rotor rotation, not the result of the action on the part by the wind flow itself .

Examples:

US2011091322

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DE202008006980U

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Other wind motors (controlling F03D 7/00)
References relevant to classification in this group
This subclass/group does not cover:
Controlling of wind motors
{Wind motors having a single vane which axis generate a conus or like surface}
Definition statement
This subclass/group covers:

Illustrated example of subject matter classified in F03D 5/005.

US4561826

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the wind-engaging parts being attached to endless chains or the like
Definition statement
This subclass/group covers:

Illustrated example of subject matter classified in F03D 5/02.

WO2010060911

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the wind-engaging parts being attached to carriages running on tracks or the like
Definition statement
This subclass/group covers:

Illustrated example of subject matter classified in F03D 5/04.

EP078853

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the wind-engaging parts swinging to-and-fro and not rotating
Definition statement
This subclass/group covers:

Illustrated example of subject matter classified in F03D 5/06.

US2009/0224553

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Controlling wind motors
Definition statement
This subclass/group covers:

Control of wind motors and related control arrangements.

F03D 7/02 and F03D 7/06 covers essentially the two main types of wind motors according groups F03D 1/00 and F03D 3/00. Main group F03D 7/00 covers all other types of wind motors.

Subgroups F03D 7/0204 to F03D 7/0296 cover the purpose of the control or the type of control actuators. Subgroups under F03D 7/04 cover the type of controllers and/or the control methods.

References relevant to classification in this group
This subclass/group does not cover:
Supplying or distributing electric power
Controlling electric generators
Informative references
Attention is drawn to the following places, which may be of interest for search:
Controlling in general
Special rules of classification within this group

Multi-aspect classification should be applied in this group. Documents should be classified in F03D 7/02 for purpose of control or the type of controller and in addition according the control method or type of controller in group F03D 7/04. For example, a model-based controller acting on the pitch system to reduce rotor noise should be classified in groups F03D 7/045, F03D 7/0224 and F03D 7/0296.

Adaptations of wind motors for special use; Combinations of wind motors with apparatus driven thereby (aspects predominantly concerning driven apparatus)
Definition statement
This subclass/group covers:

Adaptations of wind motors for special use, e.g. for converting solar radiation into useful energy by producing heat or for producing heat in heat pump systems;

Combinations of wind motors with water energy converters, e.g. water turbines;

Combinations of wind motors with apparatus driven thereby, e.g. pumps or compressors, electrical generators, heat pump systems or apparatus storing energy.

References relevant to classification in this group
This subclass/group does not cover:

Examples of places where the subject matter of this group is covered when specially adapted, used for a particular purpose, or incorporated in a larger system:

Arrangements in connection with vehicle propulsion units with power supply from wind
Propulsion of ships or other waterborne vessels by wind motors driving water-engaging propulsive elements
Pumps characterised by combination with wind motors
Informative references
Attention is drawn to the following places, which may be of interest for search:
Structural association of electric generator and wind motor
Supplying or distributing electric power, Grid connection
Systems for storing electric energy
Details, component parts, or accessories not provided for in, or of interest apart from, the preceding groups
Informative references
Attention is drawn to the following places, which may be of interest for search:
Cleaning in general
Cooling of machines
Shafts and Bearings per se
Gearing per se
Warning lights
F21S8/00Q2
Investigating strength properties of materials
Wind / Weather forecasting
Cabling / Lighting protection
Mounting structures
Definition statement
This subclass/group covers:

The structures onto which the wind motors are mounted.

References relevant to classification in this group
This subclass/group does not cover:
Process of mounting the wind motors or their structures
Informative references
Attention is drawn to the following places, which may be of interest for search:
Offshore structures
Foundations
Masts/Towers in general
Special rules of classification within this group

Use codes F05B 2240/90 for particular types of structures.

This page is owned by Office of Patent Classification.
Last Modified: 10/11/2013