Homemade wind turbine. Springs. Scheme, description

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ENCYCLOPEDIA OF RADIO ELECTRONICS AND ELECTRICAL ENGINEERING
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Homemade wind turbine. Springs. 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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The spring 20 is made of steel wire. In table. 1 shows the data for the spring with different diameters of the wire from which it can be made.

Table 1. Spring sizes 20

Wire diameter, mm	Average coil diameter, mm	Approximate mandrel diameter, mm	Number of coils in the spring
2,5	19	11	200
2,8	25	16	160
3,0	32	23	120
3,5	52	42	130

Since each spring, when removed from the mandrel, slightly increases the diameter of its coil, the size of the mandrel in Table. 1 is shown only approximately. To accurately determine the required diameter of the mandrel, it is necessary to wind several turns of wire, remove them on the mandrel, measure the diameter of the spring coil and, as a result of measurement, slightly increase or decrease the thickness of the mandrel. It is desirable that the discrepancy between the required and manufactured diameters of the spring coil does not exceed 1 mm.

Before reinstalling the spring, it must be checked by hanging a load of 12 kg from it. Upon release from the load, the spring must have the same dimensions. If it stretches after that, then it is necessary to make a new spring from a more elastic wire.

The spring is best wound on a lathe. A hole is made in the mandrel, the end of the wire is inserted into it and, by rotating the mandrel, the spring is wound. It is recommended to clamp the wire in the caliper between two wooden blocks so that it stretches better.

Author: Perli S.B.

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