Towardtheendofthe14thcentury,thesepostmills单柱风车evolvedintothetraditionalHollandtowerwindmills塔式风车somewithtowersuptothreestorieshigh三层楼高.Therotors风车里的转动轴承ofthesewindmillsareattached与……连接toarotatingtowercap可以转动的塔顶,allowingthewindmilloperator操作员topointtherotorblad
esintothewindbyturningthecap转动塔顶.ManyoftheseHol－landtowerwindmillscontaintwoorthreeinteriorlevels内部夹层wheregoodsmilled货物被碾磨ormanufacturedin－sidethewindmill-includinggrain谷物,lumber木材,paint颜料,andtobacco烟草couldalsobestored也可以被储藏.Hollandwindmillperformance荷兰风车的表现increasedgreatlyoverthenext500years.Thetypicalwindmill典型的风车evolvedinto进化成为atowerbuiltofwood,stone,orbrickthatsupportedarotor风车里的转动轴承withfourcloth-coveredblades有布覆盖的叶片thatactedlikesails像帆一样.Thisrotor,spanningadiameter覆盖的直径of25meters(80feet),wascapableofdelivering提供25to30kilowatts千瓦ofmechanicalpower机械能量.Technicalinnovations技术革命totheHollandwindmillincludedthemulti-bladefantail扇状尾protrudingbehindtherotor突出于转动轴承toautomatically自动地keeptherotorpointingintothewind;automaticallyadjustingblades自动调节风车叶片Duringthezenith顶峰oftheHollandwindmill,some1,500megawatts兆瓦特ofpowerwerebeingproduced.王宇非
