Patent ID: 8502122
Filing Date: 2013-08-06
Classification: C21D,H05B,Y02P

Abstract:
1. An induction heating system for heating a metal plate, the metal plate having a length, sides across the length, a width, ends across the width, a center, a front surface side, and a back surface side, the induction heating system comprising: an induction coil comprising at least two sections each formed by connecting a conductor at the front surface side of the metal plate and a conductor at the back surface side to circle the width of the metal plate at a distance from the front and back surfaces of the metal plate, the induction heating system configured for induction heating the metal plate passing through the induction coil encircling the metal plate, wherein said at least two sections of the induction coil are arranged to adjoin along the length of the metal plate, and, in a vertical projection of the conductors at the front surface side and back surface side onto the metal plate, the front surface side conductor and back surface side conductor are arranged a distance apart along the length of the metal plate such that the projections of the front and back surface conductors do not overlap at the center of the metal plate but overlap outside the ends of the metal plate, wherein, at least one of the front surface side and back surface side conductors has a part slanted with respect to the width of the metal plate, and wherein the front surface side conductors of the at least two sections are in proximity a first distance apart along the length of the metal plate, the back surface side conductors of the at least two sections are arranged a second distance apart along the length of the metal plate, and the second distance between the back surface side conductors is greater than the first distance between the front surface side conductors, or the first distance between the front surface side conductors is greater than the second distance between the back surface side conductors.