Oil sucks, wind blows.
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A good question, I think.But we also maybe need to understand motivation: would such a project be for satisfaction in its own right, or to save money or carbon?For a typical urban site the latter seem unlikely given your criteria.RgdsDamon
The mast will be heavily overdimensioned and based on the different cross-sections it is possible to do calculations on it.There is also not such a nasty load on the mast when there is a quietly running turbine on it with safe blade adjustment. (Attachment Link)
Quote from: mbouwer on February 16, 2023, 03:05:59 PMToday a friend gave me this Sparta bicycle motor and the intention is to turn it into a windmill generator. (Attachment Link) If you count the number of magnets you get 20, so there are ten north poles and ten south poles. If you count the number of coils you get twentyfour. So the ratio is 24/20 = 6/5. These different numbers are chosen to prevent a high peak in the cogging torque but I doubt if this is effective enough to use this motor as a generator for a wind turbine. The angle in between the magnet poles of the armature is 360/20 = 18°. The angle in between the stator poles is 360/24 = 15°. So the difference is 3°. This means that you will get 360/3 = 120 preference positions per revolution. This isn't a high number and therefore the preference positions will be rather strong. These rather strong preference positions won't be a problem for a bicycle motor but it may give your wind turbine a rather high starting wind speed.
Today a friend gave me this Sparta bicycle motor and the intention is to turn it into a windmill generator. (Attachment Link)
For a windmillfriend who wants to get started with a bicycle motor:I still have one lying around and you can get it for free. (Attachment Link)
The bicycle motor has an outside rotating drum with magnets.If you want to start from a existing construction with magnets and coils, wouldn't it be easier to use a DC motor with an inside rotating rotor as a starting point? (Attachment Link)
Nice test set-up: Vestas equipped with guyed blades. (Attachment Link)