TEMPERATURE CONTROLLER USED AT INDUCTION HEATING Russian patent published in 1997 - IPC

FIELD: induction heating. SUBSTANCE: temperature controller used at induction heating of slab positioned between the lower and upper movable induction heaters uses a temperature setter and a temperature-sensitive element, power transducer, speed transducer, armature current transducer, series-connected temperature regulator, speed regulator, current regulator, controlled thyristor transducer, whose output is connected to the armature circuit of the upper induction heater moving motor whose shaft is rigidly connected to the shaft of the speed transducer, and by means of a ball-and-screw pair of the reduction gear it is connected to the induction heater electrically coupled to the input of the power transducer, whose output is connected to the first input of the power regulator, the second input of the current regulator is connected to the output of the armature current transducer cut in the armature circuit of the upper induction heater moving motor, the output of the speed transducer is connected to the second input of the speed regulator, the output of the temperature setter is connected is connected to the first input of the temperature regulator, whose second input is connected to the output of the temperature transducer; the temperature pattern of the object is represented by aperiodic sections, whose number is determined by preset irregularity of heating ± ε and at e_preset= +-(20 to 30)deg C makes up the number of aperiodic sections N=2, and at ε_preset= +-15 deg C - the number of aperiodic sections N=3 differing by the fact that the device includes a clock pulse generator, switch, N gates, temperature regulator, having a proportional-plus-integral dependence of output voltage on input voltage, has N circuits of series-connected resistor and capacitor in a feedback coupling, each circuit incorporates a gate, whose control circuits are connected to the respective N-outputs of the switch, whose input is connected to the output of the clock pulse generator. EFFECT: improved design. 2 dwg