The VF series consists of gearboxes and geared -motors ... - Famco
The VF series consists of gearboxes and geared -motors ... - Famco
The VF series consists of gearboxes and geared -motors ... - Famco
Create successful ePaper yourself
Turn your PDF publications into a flip-book with our unique Google optimized e-Paper software.
GUIDE TO THE SELECTION THE WORM GEARBOXESEFFICIENCYIt is very important to consider the efficiency for the selection <strong>of</strong> the worm <strong>gearboxes</strong>. For intermittentduty applications (hoistings, operations, etc.) it is necessary to increase the motor’s power inorder to compensate the low efficiency <strong>of</strong> the gearbox during the starting. For this purpose weremind you that the best value appears after some hours <strong>of</strong> running-in <strong>and</strong> it is reached in thesteady state operating <strong>gearboxes</strong>.<strong>The</strong> value M2 (daNm) indicated on the catalogue, are calculated considering the efficiency <strong>of</strong> thesteady state <strong>gearboxes</strong>.<strong>The</strong> graph below indicates the different torque among <strong>VF</strong>-R<strong>VF</strong>-<strong>VF</strong>.../ <strong>VF</strong> <strong>of</strong> the same size (ex.<strong>VF</strong>62-R<strong>VF</strong>62-<strong>VF</strong>30/62).If the ratios <strong>of</strong> 2 different types are overlapped, the best choice, in particular for heavy applicationswith frequent shocks <strong>and</strong> overload starts (f.i.hoistings), is the type with the higher torque(<strong>and</strong>efficiency).DIRECTION OF ROTATIONFor all the worm <strong>gearboxes</strong> the direction <strong>of</strong> the screw is right-h<strong>and</strong>.Page 16DOCUMENT CODE:RO04-05 REVISION NO.:03
Change language