Gradient induction heating of a workpiece
AssigneeInductotherm Corp.
InventorsOleg S. Fishman, Vladimir V. Nadot
Life of this patent
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Abstract
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 input 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 with the pulse width modulated ac power outputs of the other power supplies via a control line between the controllers of all power supplies.
Claims17
Apparatus for gradient induction heating or melting of a workpiece, the apparatus comprising:
- a plurality of induction coils sequentially disposed around the workpiece;
- a separate power supply for each one of the plurality of induction coils, each separate power supply comprising an inverter having an adjustable pulse width modulated ac output connected to its associated induction coil;
- and
- a control line connected between the power supplies to synchronously control the pulse width modulated ac outputs of the power supplies.
Apparatus for gradient induction heating or melting of a workpiece, the apparatus comprising:
- two or more induction coils sequentially disposed around the workpiece;
- an inverter for each one of the two or more induction coils, each of the inverters comprising at least four solid state switching devices, each of the inverters having a pulse width modulated ac output connected to its associated induction coil;
- a controller associated with each of the inverters to control the inverter's switching devices;
- and
- a control line connected between the inverters to synchronously control the outputs of the inverters.
Apparatus for gradient induction heating or melting of a workpiece, the apparatus comprising:
- two or more induction coils sequentially disposed around the workpiece;
- an inverter for each one of the two or more induction coils, each of the inverters comprising at least four solid state switching devices, each of the inverters having a pulse width modulated ac output connected to its associated induction coil, each of the inverters having a tuning capacitor across the input of the inverter;
- a controller associated with each of the inverters to control the inverter's switching devices;
- and
- a control line connected between the inverters to synchronously control the outputs of the inverters.
Dependencies are inferred from the claim text.