Patent ID: 8491025

Claim:
A system for operating an electric crane, comprising: a magnet; a magnet controller in communication with the magnet that controls current flow through the magnet for creating a magnetic field about the magnet; and a closed-loop feedback system that effects automatic control over the magnet controller including: a feedback device arranged proximate the magnet and away from an operator cabin of the electric crane, wherein the feedback device is communicatively-coupled with the magnet controller, wherein the feedback device creates a feedback input value, a logic controller that receives said feedback input value from the feedback device, wherein, responsive to the feedback input value, the logic controller creates a command value receivable by the magnet controller for causing the magnet controller to automatically modify the current flow through the magnet during operation of the electric crane such that the magnet is automatically operated with a minimum amount of current for automatically creating a magnetic field corresponding to at least one characteristic of material to be lifted by the electric crane for increasing operating efficiency of the magnet while operating the magnet at a lower operating temperature.