Patent ID: 6340811
Filing Date: 2002-01-22
Classification: H05B

Abstract:
An induction-heated roller device comprising:a rotary roll; twelve induction coils being successively disposed within a hollow space of said rotary roll while being spaced apart in an axial direction of said rotary roll; and a three-phase power source for exciting said induction coils, wherein said induction coils are arranged into: a first group of three delta connected induction coils excited by line voltages of the three-phase power source; a second group of three star-connected induction coils being excited by said line voltages and being spaced apart in a phase rotation direction of said first group of induction coils; a third group of three delta-connected induction coils being excited by phase-shifted voltages formed by phase-shifting voltages of the three-phase power source by 180Â° and being spaced apart in a phase rotation direction of said second group of induction coils; and a fourth group of three star-connected induction coils being excited by the phase-shifted voltages and being spaced apart in a phase rotation direction of said third group of induction coils.