Balcony wind turbine. Scheme, description

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ENCYCLOPEDIA OF RADIO ELECTRONICS AND ELECTRICAL ENGINEERING
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Balcony wind turbine. Encyclopedia of radio electronics and electrical engineering

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Encyclopedia of radio electronics and electrical engineering / Alternative energy sources

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Many people try to put the wind turbine propeller directly on the generator shaft. The diameter of such a propeller is not more than 1 m, especially to increase the speed (the speed of the end of the blade is the same for propellers of any diameter [BSE]!). The complete absence of a gearbox makes the installation less noisy.

A small propeller is effective enough only at high wind speeds, on which the power "on the shaft" depends on a cubic (not to be confused with a quadratic!) law. There is enough wind on the balconies of high-rise buildings. Villages were founded in windless places, and the villagers suffer with masts, gearboxes, rotary mechanisms, etc. Another thing, a balcony - no tail, no current collector ... Has the wind changed? I went out to the balcony and turned where I needed to!

Now we are experimenting with recuperators*, but we are already planning to rewind autogenerators for 220/380 V.

* Recuperators are called devices for returning current to the power grid (see figure).

Balcony wind turbine

The resistors are selected for optimal operating conditions under which the heating of the transistors is minimal, and the counter spins back.

Author: Y. Borodaty, Ivano-Frankivsk region.

See other articles Section Alternative energy sources.

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USB keys for accessing sites 02.11.2014

Google announced the launch of two-factor authentication on its sites using a physical USB key. You can buy a key on Amazon. Now the store has three models of keys costing from $6 to $60.

All dongles use the open Universal 2nd Factor (U2F) protocol developed by the FIDO Alliance. The keys can be used on any site (not just Google) that adds support for this protocol.

USB keys do not require installation - just place it in the computer's USB port after entering the password on the site, when the site asks for it. All keys work with Windows, OS X, Linux and Chrome OS. To work with a USB key, you must use the Google Chrome browser version 38 or higher.

The use of USB keys is completely free, however, users must purchase them at their own expense. Keys differ in design. The most expensive model for $60 is equipped with Java Card technology.

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