GRADIENT INDUCTION HEATING OF A WORKPIECE

摘要

An apparatus and process are provided for gradient induction heating or melting of a workpiece with a plurality of induction coils, each of the plurality of induction coils is connected to a power supply that may have a tuning capacitor connected across the inpu t of an inverter. The plurality of induction coils are sequentially disposed around the workpiece. The inverter has a pulse width modulated ac power output that may be in synchronous control wit h the pulse width modulated ac power outputs of the other power supplies via a control line between the controllers of all power supplies.