Induction heating plate

An induction heating device for heating a bearing having an inner ring and an outer ring, the device comprising:

• a support plate with an upper surface for receiving a side face of the bearing;
• a plurality of concentrically arranged induction coils provided at an underside of the support plate, each induction coil being connected to and selectively powered by a generator;
• a plurality of temperature sensors arranged on the upper surface of the support plate at different radial distances from a center axis (a) of the concentric coils, each coil being associated with one or more temperature sensors that overlap windings of the coil or which are in close radial proximity thereto;
• a control unit that controls the generator and receives and monitors a temperature signal from each of the temperature sensors, the control unit being configured to:
• receive and process a signal indicative of a load on each coil, when selectively powered, to identify a first coil that is electromagnetically coupled to the inner ring and a second coil that is electromagnetically coupled to the outer ring;
• select a temperature sensor associated with the identified first coil as a first temperature sensor for measuring the temperature of the inner ring;
• select a temperature sensor associated with the identified second coil as a second temperature sensor for measuring the temperature of the outer ring;
• and
• execute a heating cycle in which at least the first and second coils are controlled, based on the temperature signals from the first and second temperature sensors.