There aren't any. With the development of variable speed electric motor controls the hydraulic motor has slipped into oblivion. ■

Efficiency is the biggest factor to look at - a hydraulic drive is very poor efficiency compared to a VFD electrical / mechanical drive. ■

Maybe mechanical engineers can understand the operation of hydraulic drives while variable speed electric motor controls are "black magic boxes". ■

The problem with the “black magic boxes” is the ‘wall of not understanding” between mechanical and electrical engineers.

Once the knowledge is combined in one person, the benefits of modern technology pays off.

I always enjoyed this position in my work.

Teus ■

Hi all..

The advantage of a variable speed hydraulic drive is that the slower you go, the higher the torque you get for the same power.

This is especially significant for belt feeders where the breakaway torque is often way over twice the running torque.

VSD electrical drives push out little over 160% on start up.

As for conveyors...no advantages over electro-mechanical drives, for most normal installations.

Cheers

LSL Tekpro ■

1)Oil top ups - filter changes

2)top up oil - filter elements

3)already mentioned

You only resort to hydraulics when you're getting into deep clag. ■