Internally cooled magnetic rotor for heating a substrate

A heating system for a metal strip, the heating system comprising:

• a magnetic rotor comprising:
• a rotor body rotatable about an axis of rotation and defining a chamber, the chamber having an inlet and an outlet, wherein the rotor body defines a coolant flow path within the chamber from the inlet to the outlet, and wherein the rotor body is configured to receive a coolant within the chamber;
• and
• at least one magnet supported on an outer surface of the rotor body, wherein the magnetic rotor is positioned adjacent a pass line of the metal strip moving in a processing direction and is configured to heat the metal strip moving in the processing direction, wherein the axis of rotation of the rotor body is perpendicular to the processing direction;
• a coolant supply in fluid communication with the magnetic rotor such that the coolant is selectively provided into the chamber of the rotor body;
• a sensor configured to detect at least one characteristic of the magnetic rotor system, wherein the at least one characteristic comprises at least one of a temperature gradient of the magnetic rotor or a temperature gradient of the coolant within the chamber;
• and
• a controller communicatively coupled to the sensor, wherein the controller is configured to control the magnetic rotor system based on the at least one characteristic detected by the sensor by controlling at least one of the pressure of the coolant exiting the magnetic rotor, the pressure of the coolant entering the magnetic rotor, the temperature of the coolant entering the magnetic rotor, the temperature of the coolant exiting the magnetic rotor, or the flow rate of the coolant through the chamber.