Tower for wind energy plant has at least one polygonal cross section at top end of lower sector and upper sector in form of tube with fitting and circular cross-sections ends

摘要

The tower has a lower machinery sector (2) with a polygonal cross section at its top end and a tube-form upper tower sector (4), with a matching polygonal cross section, i.e. one with the same number and size of sides, at its lower end (16), and a circular cross section at its upper end (18). The upper section may change gradually from one cross section to the other.