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DIY Wind Turbines

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					                 EWB-UK Workshop Guide
                   DIY Wind Turbines


Description

A workshop that introduces the Hugh Piggott wind turbine along with the important design features
and key components.



This workshop guide has been based on a workshop provided by V3 Power at Small is…Festival 2011.
(http://www.v3power.co.uk/). It is not possible to run this workshop using this guide alone. This
guide will provide a structure and format for the workshop. Further reading is required around the
topic. To find more information visit the home page of Hugh Piggott’s website
http://www.scoraigwind.com/. It is almost essential to purchase the wind turbine recipe book
written by Hugh Piggott http://www.scoraigwind.com/axialplans/index.htm#BUY .

This guide provides the key points which need to be discussed. The relevant information can be
found in the recipe book. You may choose to discuss other points or some of the points listed here in
more detail
                                                                         DIY Wind Turbines

At a glance

Total time: 1 hour

Learning Styles: Visual, Auditory

Objectives: To gain a greater understanding of how the Hugh Piggott wind turbine works

Audience: Anyone

Max/Min no. of participants: N/A


Timetable


Time                                Activity
5 minutes                           Welcome & Introduction
10 minutes                          Blades
5 minutes                           Alternator
5 minutes                           AC Output
10 minutes                          Mounting
5 minutes                           Protection
5 minutes                           Tower
5 minutes                           Electrical Systems
5 minutes                           Application
5 minutes                           Closing




Facilitator Materials


        Model of full scale turbine (Will require construction in advance, see further information for
        an example)
       OR
       Power point containing the relevant photos/diagrams (These can match the headings in the
        table above)
       Hugh Piggott wind turbine recipe book (~£10)


Preparation


       Read the wind turbine recipe book
       Prepare model of turbine or power point
       Prepare sign-up sheets for new members




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                                                                       DIY Wind Turbines



Room requirements


       None if power point
       If using a model somewhere outside which isn’t sheltered to the wind




Welcome & Introduction (5 minutes)

Introduce yourself:

       Your Name
       Position/Job/Organisation
       Your role in the workshop
       Relevant experience to the workshop (University, projects, work etc.)



Explain the learning objectives of the workshop to the audience:

 The aim of the workshop is for everyone to develop a greater understanding of how
 the Hugh Piggott wind turbine works. This will involve looking at the individual
 components of the wind turbine such as the blades, the electronics and the tower.

 This is a brief introduction to the design of a wind turbine. To gain a greater
 understanding you can read the Hugh Piggott recipe book on how to build a wind
 turbine from scratch. The cost is roughly £10




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                                                                            DIY Wind Turbines

Blades (10 Minutes)

The first part of the turbine to examine is the blades. This can include:

    -   Basic blade theory
    -   A discussion about the number of blades (Can be 6 but normally 3)
    -   A closer examine of a blade and its key features (Aerofoil, leading edge etc.)
    -   How the blades are made and the tools used
    -   The type of wood used to make the blade
    -   Any issues the blades may face (e.g. Turbulence)
    -   Efficiency of the turbine in relation to the blades and wind speed




Alternator (5 minutes)

Here you want to discuss the role of the alternator i.e. the role of the coils and magnets. Things to
discuss

    -   Number of coils (Depending on design = 9)
    -   How the coils are connected (Depending on design = Every 3rd coil)
    -   The position of the magnets on the steel plate
    -   The process of casting the alternator in polyester resin




AC Output (5 minutes)

This section describes how to deal with the AC output created by the turbine and how to deal with
some of the electronics:

    -   Rectifying the AC signal to a DC signal, enabling batteries to be recharged
    -   A discussion on the 12V/24V/48V options (This will depend on the wire used in the coil)
    -   The voltage needs to be matched for what it will be used for

Also can discuss the issue of twisting cables; how to avoid doing this by putting a pole down and
leaving plenty of slack




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                                                                          DIY Wind Turbines

Mounting (10 minutes)

This section describes how the alternator is mounted onto the tower as well as other important
issues when putting up the turbine

   -   Done by hand and welding
   -   Can discuss it is possible to weld off grid with a battery if in remote areas
   -   Discussion on the bearings used and their position



   -   A mention on how the turbine reacts in high winds (Using the tail to turn the turbine so it
       parallel to the wind)

   -   The turbine also has an air brake to stop it from spinning

   -   A mention of the position of the turbine (The higher up the better, should avoid trees &
       buildings to avoid turbulence)




Protection (5 minutes)

A quick discussion on how the turbine is protected from the elements:



   -   The blades are varnished and painted
   -   Yearly maintenance checks as well as any monthly/weekly visual checks
   -   Tape on leading edge




Tower (5 minutes)



A section about the tower that supports the turbine:

   -   The tower needs to be ‘over engineered’ to avoid accidents
   -   Jin pole is used to erect the tower
   -   Held in place by steel guy ropes
   -   Can be erected by 2 people but the calculations must be perfect
   -   A Crane + concrete base should be used where appropriate




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                                                                          DIY Wind Turbines



Electrical Systems (5 minutes)



A discussion on the electrical system of the turbine:

    -   It is mainly designed for battery charging
    -   Can also be used for water heating or water pumps
    -   Requires a safety device to prevent overcharging of the batteries
    -   There needs to be a dump load or the turbine can break




Applications (5 minutes)



A final discussion about the application of a turbine in relation to its power rating, for example:

    -   A 1kW turbine could power 5-6 laptops all day




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                                                                        DIY Wind Turbines

Closing (5 minutes)

Summarize the workshop:

 You’ve just provided a brief introduction to the Hugh Piggott wind turbine. You’ve
 covered the materials, design features and key aspects that need to be considered.

 For anyone interested in wind turbines you should encourage them to buy a copy of
 the recipe book.

 For workshops leaders:

 V3 power offer courses in wind turbine construction and are able to come to each
 university and help a branch build their own wind turbine. This will of course cost a
 significant amount but will it will take a group of students through all the stages
 mentioned in this guide. The course will get students building the turbine from
 scratch; carving blades, cutting and welding the tower, winding the coil, casting the
 alternator. Where possible the turbine could be connected to the grid

 Their work is based on the recipe book so if you are feeling adventurous you can
 attempt this yourself!

Final few words:

      Announce next event or meeting
      Distribute sign up lists (If applicable)
      Open the floor to questions




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                                                                      DIY Wind Turbines

Further Information
An example of a model wind turbine. Using the wind turbine recipe book a model of this size could
be constructed in advance.




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posted:2/24/2012
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