This forestry cable crane uses a motor-generator and stored downhill energy to power uphill movement without combustion emissions.
Calculating trolley acceleration from pendulum equations eliminates swing when rope length changes, achieving accurate load positioning.
Counterweights offset gravitational forces on the moving platform, reducing motor drive load while maintaining stability in cluttered large workspaces.
A cable crane trolley employs a controllable clutch to drive two hoist rope drums, preventing load twisting without adding heavy secondary carriages.
Segmenting support between a main rope and work rope reduces winding device power requirements.