A heating device includes a base; a supporter disposed on the base, the supporter has a chamber therein and the chamber being configured for receiving the tobacco cigarette; an electromagnetic induction coil, wound around the supporter and configured for generating an alternative magnetic field in the chamber; at least one first heating element disposed in the chamber; when the tobacco cigarette is disposed in the chamber, the at least one first heating element contacts an outer surface of the tobacco cigarette and is configured for generating a vortex in the alternative magnetic field to heat the tobacco cigarette; and a second heating element disposed on the base; when the tobacco cigarette is disposed in the chamber, the second heating element is inserted into the tobacco cigarette and configured to generate a vortex in the alternative magnetic field to heat the tobacco cigarette.

A hand-held heating unit is disclosed having a turbine connected to a generator to generate electrical power from a compressed air source. The electrical power produced by the generator is suppled to a transformer to establish a voltage which is in turn used to energize a coil with an alternating current. The current causes a magnetic field to form in the coil that can be used to heat ferrous materials within the coil. A circuit board can control the current and frequency for different applications.

A hand-held heating unit is disclosed having a turbine connected to a generator to generate electrical power from a compressed air source. The electrical power produced by the generator is suppled to a transformer to establish a voltage which is in turn used to energize a coil with an alternating current. The current causes a magnetic field to form in the coil that can be used to heat ferrous materials within the coil. A circuit board can control the current and frequency for different applications.

The invention relates to a method and a heating device (1c) for inductively heating a stator (2) or armature (3) of an electric machine, in particular before and during trickle impregnation thereof. In addition, the invention relates to an impregnating device (50) in which this heating device (1c) is integrated. According to the invention, it is provided that the heating takes place inductively by electromagnetic fields of different frequencies. For this purpose, it is provided in the case of the heating device (1c) that it has at least one electromagnetic inductor (18, 21, 24) which is disposed coaxially or axially parallel with respect to the longitudinal axis (7) of the stator (2) or armature (3) and which inductively heats said stator or armature, and that the at least one inductor (18, 21, 24) is designed to generate at least two electromagnetic fields of different frequencies.

The invention relates to a method and a heating device (1c) for inductively heating a stator (2) or armature (3) of an electric machine, in particular before and during trickle impregnation thereof. In addition, the invention relates to an impregnating device (50) in which this heating device (1c) is integrated. According to the invention, it is provided that the heating takes place inductively by electromagnetic fields of different frequencies. For this purpose, it is provided in the case of the heating device (1c) that it has at least one electromagnetic inductor (18, 21, 24) which is disposed coaxially or axially parallel with respect to the longitudinal axis (7) of the stator (2) or armature (3) and which inductively heats said stator or armature, and that the at least one inductor (18, 21, 24) is designed to generate at least two electromagnetic fields of different frequencies.

An induction heating system for heating a component, the induction heating system having an alternating voltage supply device, a capacitor, a displacement unit, and an induction coil. The alternating voltage supply device supplies alternating voltage to a series resonant circuit which is formed by the capacitor and the induction coil. The displacement unit allows the induction coil to be displaced laterally in at least one direction relative to the component. The capacitor is situated between the displacement unit and the induction coil. A device for the additive manufacturing of a component uses such an induction heating system.

An induction heating system for heating a component, the induction heating system having an alternating voltage supply device, a capacitor, a displacement unit, and an induction coil. The alternating voltage supply device supplies alternating voltage to a series resonant circuit which is formed by the capacitor and the induction coil. The displacement unit allows the induction coil to be displaced laterally in at least one direction relative to the component. The capacitor is situated between the displacement unit and the induction coil. A device for the additive manufacturing of a component uses such an induction heating system.

An induction heating apparatus according to one embodiment comprises a working coil disposed in a position corresponding to a heating zone, an inverter circuit that comprises a plurality of switching elements and supplies current to the working coil, a driving circuit that supplies a switching signal to each of the switching elements included in the inverter circuit, a current sensor that measures a resonance current value, magnitude of resonance current flowing in the working coil, and a controller that supplies a control signal for adjusting a duty ratio and a frequency of the switching signal to the driving circuit, to drive the working coil.

An induction heating apparatus according to one embodiment comprises a working coil disposed in a position corresponding to a heating zone, an inverter circuit that comprises a plurality of switching elements and supplies current to the working coil, a driving circuit that supplies a switching signal to each of the switching elements included in the inverter circuit, a current sensor that measures a resonance current value, magnitude of resonance current flowing in the working coil, and a controller that supplies a control signal for adjusting a duty ratio and a frequency of the switching signal to the driving circuit, to drive the working coil.

The present disclosure relates to an induction heating device and a control method thereof. In one embodiment, at a time of a simultaneous operation of a first working coil operating at a first driving frequency and a second working coil operating at a second driving frequency, control for removing interference noise is performed based on a difference between the first driving frequency and the second driving frequency. An induction heating device of one embodiment may adjust the duty ratio of a switching signal provided to a first inverter circuit after adjusting the first driving frequency to adjust the actual output value of the first working coil to a value the same as the required output value of the first working coil.