Induction furnace with improved efficiency coil system

摘要

An induction furnace system comprising a crucible (13), an active induction coil (L1) and a passive induction coil (L2) surrounding the crucible, the passive induction coil (L2) being connected in parallel with a capacitor (C2) to form a parallel LC tank circuit, and a power supply (20) having an ac output connected to the terminals of the active induction coil (L1) to supply a first ac current to the coil (L1) of active induction, characterized in that the active induction coil (L1) and the passive induction coil (L2) surround partial sections of the crucible (13) according to a non-overlapping arrangement to create a magnetic coupling between the coils (L1, L2 ) active and passive induction when the first ac current flows through the active induction coil (L1) to induce a second ac current in the passive induction coil (L2) to inductively heat and melt material (12) electrically I drove tor arranged in the crucible (13).