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Part I of this report surveys the basic theory of induction heating and heat flow in an inductively heated steel cylinder. Part II describes an induction heating system now in use at the Watervliet Arsenal, and applies the theory of Part I to this system.

Part I of this report surveys the basic theory of induction heating and heat flow in an inductively heated steel cylinder. Part II describes an induction heating system now in use at the Watervliet Arsenal, and applies the theory of Part I to this system.

A large Class C oscillator, which is intended to be a power source for induction heating of gases, has been built. The oscillator uses eight triode vacuum tubes in a push-pull parallel configuration and is capable of a continuous power output of 3.2 MW at frequencies between 10 and 50 kHz. The report describes in detail the design of the oscillator, its auxiliary equipment, and its protective devices. The report is not intended as an operating manual; rather, it is intended to give the reader sufficient information to design experimental hardware which will properly load the oscillator, and to describe the capabilities and limitations of the oscillator.

A large Class C oscillator, which is intended to be a power source for induction heating of gases, has been built. The oscillator uses eight triode vacuum tubes in a push-pull parallel configuration and is capable of a continuous power output of 3.2 MW at frequencies between 10 and 50 kHz. The report describes in detail the design of the oscillator, its auxiliary equipment, and its protective devices. The report is not intended as an operating manual; rather, it is intended to give the reader sufficient information to design experimental hardware which will properly load the oscillator, and to describe the capabilities and limitations of the oscillator.

Induction heating technology, a magnetic non-deforming process, was developed by Langley researchers to join plastic and composite components in space. Under NASA license, Inductron Corporation uses the process to produce induction heating systems and equipment for numerous applications. The Torobonder, a portable system, comes with a number of interchangeable heads for aircraft repair. Other developments are the E Heating Head, the Toroid Joining Gun, and the Torobrazer. These products perform bonding applications more quickly, safely and efficiently than previous methods.

Perma.cc archive of http://www.ceia-power.com/index.aspx created on 2022-01-28 02:27:57.484533+00:00.

The modern technology advancement follows the evolution of power semiconductor devices. This power semiconductor device represents the heart of modern power electronics and it has the main task of modulating 

The modern technology advancement follows the evolution of power semiconductor devices. This power semiconductor device represents the heart of modern power electronics and it has the main task of modulating 

Source: Digital Library of India Scanning Centre: C-DAC, Noida Source Library: Delhi College Of Engineering Date Accessioned: 6/24/2015 2:20 The Digital Library of India was a project under the auspices of the Government of India.

I lost my original measuring cup fro Xiaomi Rice Cooker one so I made a copy using my firend's Not printed yet - but everything in slicer looks ok. PETG - recommended - due to food contact _______________ Feel free to modify and share - skechup file included

Part I of this report surveys the basic theory of induction heating and heat flow in an inductively heated steel cylinder. Part II describes an induction heating system now in use at the Watervliet Arsenal, and applies the theory of Part I to this system.

Ohmic power dissipation and energy storage in radio frequency heated low pressure helium plasma

Ohmic power dissipation and energy storage in radio frequency heated low pressure helium plasma

Ohmic power dissipation and energy storage in radio frequency heated low pressure helium plasma

We investigate the evaporation of close-by pulsar companions, such as planets, asteroids, and white dwarfs, by induction heating. Assuming that the outflow energy is dominated by a Poynting flux (or pulsar wave) at the location of the companions, we calculate their evaporation timescales, by applying the Mie theory. Depending on the size of the companion compared to the incident electromagnetic wavelength, the heating regime varies and can lead to a total evaporation of the companion. In particular, we find that inductive heating is mostly inefficient for small pulsar companions, although it is generally considered the dominant process. Small objects like asteroids can survive induction heating for $10^4\,$years at distances as small as $1\,R_\odot$ from the neutron star. For degenerate companions, induction heating cannot lead to evaporation and another source of heating (likely by kinetic energy of the pulsar wind) has to be considered. It was recently proposed that bodies orbiting pulsars are the cause of fast radio bursts; the present results explain how those bodies can survive in the pulsar's highly energetic environment.

Induction heating is a non-contact method of producing heat which can be used to perform various processes like hardening, annealing, tempering, welding, brazing, melting, forging, etc. This paper discusses the design and implementation of induction heating on a given work-piece, using an LLC resonant circuit and a transformer for impedance matching, so as to transfer a maximum power of 5KW to the load. The load parameters are found out using ELTA software which calculates the values based on the dimensions of the work piece, operating frequency and temperature. The inverter used is based on SiC MOSFETs which minimizes the losses at high frequencies and high temperatures. The theoretical and simulated results from MATLAB are analysed and verified. The hardware is implemented for the LLC circuit with transformer and the results are presented.

The inherent benefit of the induction heating system leads to usage in the domestic applications. The design part of the coil has to be accurately manipulated to have highly qualified system. Discussion on the customisation of the coil and the converter section is elaborated such that the design relaying on the load variation, type of coil, rating required for the specified application. Thus the paper discusses about the design requirement on the domestic induction applications, depicting the criteria to be satisfied and the results are verified using the AC-AC converter fed induction heating system with the help of the equivalent circuit of the working coil and the work piece.

Although a three–phase squirrel cage induction motor is known by its qualities of robustness and low cost of construction. However, this machine can be affected by potential defects that affect the production, safety, quality of service and profitability of installations. However, to show the behavior of induction motor in different operating modes, the studying of this machine is very important. This paper presented the results of an experimental investigation to see the impact of the open phase fault on the thermal behavior in the 2.2 kW three phase squirrel cage induction motor, and to display the stator current waveforms with healthy and faulty conditions under different loads. 

We report on the control of cyclotrimerization forming a polycyanurate polymer using magnetic iron oxide nanoparticles in an alternating current (AC) field as an internal heat source, starting from a commercially available monomer. Magnetic nanoparticles were dispersed in the monomer and catalytic system using sonication and the mixture was subjected to an alternating magnetic field, causing the magnetic nanoparticles to dissipate the energy of the magnetic field in the form of heat. Internal heating of the particle/monomer/catalyst system was sufficient to start and sustain the polymerization reaction, producing a cyanate ester network with conversion that compared favorably to polymerization through heating in a conventional laboratory oven. The two heating methods gave similar differential scanning calorimetry temperature profiles, conversion rates, and glass transition temperatures when using the same temperature profile. The ability of magnetic nanoparticles in an AC field to drive the curing reaction should allow for other reactions forming high-temperature thermosetting polymers and for innovative ways to process such polymers.

This report presents the concept for a multidisciplinary research program aimed at establishing the science base for the design and synthesis of magnetic nanoparticles for hysteresis heating, with potential applications ranging from novel composites processing techniques to alternative cancer treatments. Magnetic materials are used in a wide range of applications and designed for maximum efficiency or minimized hysteresis loss.

In order to promote public education and public safety, equal justice for all, a better informed citizenry, the rule of law, world trade and world peace, this legal document is hereby made available on a noncommercial basis, as it is the right of all humans to know and speak the laws that govern them. (For more information: 12 Tables of Code ) Name of Standards Organization: Bureau of Indian Standards (BIS) Division Name: Electrotechnical Section Name: Industrial Electroheating Equipment (ETD 17) Designator of Legally Binding Document: IS/IEC 519-3 Title of Legally Binding Document: Safety in Electroheat Installations, Part 3: Particular Requirements for Induction and Conduction Heating and Induction Melting Installations (Supersdeding IS 9080 (Part 3)) Number of Amendments: Equivalence: IEC 519-3:1988 Superceding: Superceded by: LEGALLY BINDING DOCUMENT Step Out From the Old to the New --Jawaharlal Nehru Invent a new India using knowledge. --Satyanarayan Gangaram Pitroda

Deep space missions with large payloads require high specific impulse and relatively high thrust to achieve mission goals in reasonable time frames. Nuclear Thermal Rockets (NTR) are capable of producing a high specific impulse by employing heat produced by a fission reactor to heat and therefore accelerate hydrogen through a rocket nozzle providing thrust. Fuel element temperatures are very high (up to 3000 K) and hydrogen is highly reactive with most materials at high temperatures. Data covering the effects of high-temperature hydrogen exposure on fuel elements are limited. The primary concern is the mechanical failure of fuel elements due to large thermal gradients; therefore, high-melting-point ceramics-metallic matrix composites (cermets) are one of the fuels under consideration as part of the Nuclear Cryogenic Propulsion Stage (NCPS) Advance Exploration System (AES) technology project at the Marshall Space Flight Center. The purpose of testing and analytical modeling is to determine their ability to survive and maintain thermal performance in a prototypical NTR reactor environment of exposure to hydrogen at very high temperatures and obtain data to assess the properties of the non-nuclear support materials. The fission process and the resulting heating performance are well known and do not require that active fissile material to be integrated in this testing. A small-scale test bed; Compact Fuel Element Environmental Tester (CFEET), designed to heat fuel element samples via induction heating and expose samples to hydrogen is being developed at MSFC to assist in optimal material and manufacturing process selection without utilizing fissile material. This paper details the analytical approach to help design and optimize the test bed using COMSOL Multiphysics for predicting thermal gradients induced by electromagnetic heating (Induction heating) and Thermal Desktop for radiation calculations.

We revisit the electromagnetic heat transfer between a metallic nanoparticle and a metallic semi-infinite substrate, commonly studied using the electric dipole approximation. For infrared and microwave frequencies, we find that the magnetic polarizability of the particle is larger than the electric one. We also find that the local density of states in the near field is dominated by the magnetic contribution. As a consequence, the power absorbed by the particle in the near field is due to dissipation by fluctuating eddy currents. These results show that a number of near-field effects involving metallic particles should be affected by the fluctuating magnetic fields.

This paper presents a soft start-up strategy of pulse-density-modulated seriesresonant converter for induction heating application. The pulse-density modulation (PDM) technique is widely used in converters based on voltagesource series-resonant inverters (SRIs) to control the output current or power. However, during a start-up process, PDM has some disadvantages both in inrush current limiting and providing a zero-voltage switching operation of SRI transistors. In the paper, different PDM techniques are considered and basic moments of PDM using within the start-up process are analyzed. A new soft start-up strategy of PDM converter for induction heating application is proposed. The main features of the proposed strategy include an interleaved or a stepped PDM control, an initial combination of PDM at the beginning of the start-up process, and an operating algorithm during the start-up process. The proposed strategy was verified by a 2.5 kW experimental setup of the pulsedensity-modulated interleaved converter with an operating frequency from 50 kHz up to 100 kHz. Experimental results confirm the effectiveness of the proposed start-up strategy and show that the maximum current amplitude within start-up processes exceeds the maximum steady-state current amplitude by no more than 30%. 

Deep space missions with large payloads require high specific impulse and relatively high thrust to achieve mission goals in reasonable time frames. Nuclear Thermal Rockets (NTR) are capable of producing a high specific impulse by employing heat produced by a fission reactor to heat and therefore accelerate hydrogen through a rocket nozzle providing thrust. Fuel element temperatures are very high (up to 3000 K) and hydrogen is highly reactive with most materials at high temperatures. Data covering the effects of high-temperature hydrogen exposure on fuel elements are limited. The primary concern is the mechanical failure of fuel elements due to large thermal gradients; therefore, high-melting-point ceramics-metallic matrix composites (cermets) are one of the fuels under consideration as part of the Nuclear Cryogenic Propulsion Stage (NCPS) Advance Exploration System (AES) technology project at the Marshall Space Flight Center. The purpose of testing and analytical modeling is to determine their ability to survive and maintain thermal performance in a prototypical NTR reactor environment of exposure to hydrogen at very high temperatures and obtain data to assess the properties of the non-nuclear support materials. The fission process and the resulting heating performance are well known and do not require that active fissile material to be integrated in this testing. A small-scale test bed; Compact Fuel Element Environmental Tester (CFEET), designed to heat fuel element samples via induction heating and expose samples to hydrogen is being developed at MSFC to assist in optimal material and manufacturing process selection without utilizing fissile material. This paper details the analytical approach to help design and optimize the test bed using COMSOL Multiphysics for predicting thermal gradients induced by electromagnetic heating (Induction heating) and Thermal Desktop for radiation calculations.

A study of the application of induction heating to graphite-based composites, both thermoset and thermoplastic. Panels of IM-6/3501-6 and IM-6/ PEEK were processed in magnetic fields of 450-kHz and 25-kHz frequencies. A 15. 24-cm-diameter pancake-type induction coil was used with 10.2-cm x 10.2-cm, 16- ply specimens. Vacuum bagging provided the only consolidation pressure. Data include resin, fiber, void contents, 3-pt. and 4-pt. loading for mechanical properties evaluation, and thermal analysis (DSC and TMA). Comparisons are made to similar samples processed under a standard autoclave cycle. Additional variables studied and discussed include the use of various caul plate materials as field susceptors, effects of coil vibration, various prepreg lay-up orientations, and other sample thicknesses. A brief discussion of the overall field effects and value of induction heating for field repair is included.

A proposal to use a varying diameter preform for forging the 120-mm M256 gun tube required a modification to the induction heating system power control to provide uniform heating of the preform. In addition, there was a need to automate the heating process for more uniform and consistent heating of constant diameter preforms. Various approaches to modify the control were investigated. A temperature feedback control, determined to be the best type, uses an infrared temperature sensor at the induction coil that sends a signal to a proportional controller. The proportional controller varies power to the induction coil based on the temperature sensed. When the preform reaches the set point temperature, the controller provides just enough power to hold the preform at temperature. Operation of the feedback control has proved successful. It also provides emergency power shutoff if the infrared instrument detects a preform temperature that exceeds a reset limit.

An induction heating head includes a length of wire having first and second opposite ends and being wound in a flat spiral shape to form an induction coil, a capacitor connected to the first and second ends of the wire, the induction coil and capacitor defining a tank circuit, and a flexible, elastomeric body molded to encase the induction coil. When a susceptor is placed in juxtaposition to the body, and the tank circuit is powered, the susceptor is inductively heated.

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This article is from Journal of Functional Biomaterials , volume 3 . Abstract To develop a novel ablation therapy for human solid cancer, the heating properties of a ferromagnetic carbon steel rod and a prototype Ti-coated needle using this carbon steel rod, were investigated in several high-frequency outputs at 300 kHz. In the former, the heating property was drastically different among the three inclination angles (θ = 0°, 45° and 90°) relative to the magnetic flux direction as a result of the shape magnetic anisotropy. However, the effect of the inclination angles was completely eliminated in the latter. It is considered that the complete non-oriented heating property relative to the magnetic flux direction allows the precise control of the ablation temperature during minimally invasive thermotherapy without a lead-wire connected to a fiber-optic thermometer. This newly designed Ti-coated device will be suitable for clinical use combined with its superior biocompatibility for ablation treatments using high-frequency induction heating.

An induction heating device includes an induction heating gun which includes a housing, a U-shaped pole piece having two spaced apart opposite ends defining a gap there between, the U-shaped pole piece being mounted in one end of the housing, and a tank circuit including an induction coil wrapped around the pole piece and a capacitor connected to the induction coil. A power source is connected to the tank circuit. A pull test machine is provided having a stationary chuck and a movable chuck, the two chucks holding two test pieces bonded together at a bond region. The heating gun is mounted on the pull test machine in close proximity to the bond region of the two test pieces, whereby when the tank circuit is energized, the two test pieces are heated by induction heating while a tension load is applied to the two test pieces by the pull test machine to determine separation strength of the bond region.

An induction heating device includes an induction heating gun which includes a housing, a U-shaped pole piece having two spaced apart opposite ends defining a gap there between, the U-shaped pole piece being mounted in one end of the housing, and a tank circuit including an induction coil wrapped around the pole piece and a capacitor connected to the induction coil. A power source is connected to the tank circuit. A pull test machine is provided having a stationary chuck and a movable chuck, the two chucks holding two test pieces bonded together at a bond region. The heating gun is mounted on the pull test machine in close proximity to the bond region of the two test pieces, whereby when the tank circuit is energized, the two test pieces are heated by induction heating while a tension load is applied to the two test pieces by the pull test machine to determine separation strength of the bond region.

Part I of this report surveys the basic theory of induction heating and heat flow in an inductively heated steel cylinder. Part II describes an induction heating system now in use at the Watervliet Arsenal, and applies the theory of Part I to this system.

Part I of this report surveys the basic theory of induction heating and heat flow in an inductively heated steel cylinder. Part II describes an induction heating system now in use at the Watervliet Arsenal, and applies the theory of Part I to this system.

An induction heating device includes a handle having a hollow interior and two opposite ends, a wrist connected to one end of the handle, a U-shaped pole piece having- two spaced apart ends, a tank circuit including an induction coil wrapped around the pole piece and a capacitor connected to the induction coil, a head connected to the wrist and including a housing for receiving the U-shaped pole piece, the two spaced apart ends of the pole piece extending outwardly beyond the housing, and a power source connected to the tank circuit. When the tank circuit is energized and a susceptor is placed in juxtaposition to the ends of the U-shaped pole piece, the susceptor is heated by induction heating due to a magnetic flux passing between the two ends of the pole piece.

This paper presents a series-resonant inverter (SRI) with an extended topology using a pulse-density modulation (PDM) control method. Theoretical analysis shows that the use of the SRI with extended topology and the PDM control (extended PDM-SRI) allows reducing the fluctuation of the SRI output current by more than 40% at the quality factor of 5 compared to a conventional SRI with the traditional PDM control. To eliminate drawbacks of the extended PDM-SRI, specificities of PDM switching sequences to ensure the zero-voltage-switching (ZVS) operation are discussed in detail, and a solution to the voltage imbalance across the capacitors of the extended topology is proposed. Simulation analysis of the extended PDM-SRI confirmed the effectiveness of using the proposed solutions to eliminate the drawbacks. The feasibility of the proposed SRI is confirmed by testing on a 2.2 kW experimental setup.

Generally, domestic induction-heating technology requires a high output power levels with less number of components in a compact size. To satisfy these requirements, the basic circuit configurations are considered based on the combination of a rectifier and a inverter. The main disadvantage of this method has low-efficient and economic problems. This paper proposes a new concept unlike previous method, i.e the direct conversion of ac–ac converter for reducing the component count, reduce cost, improve reliability, and also efficiency. Generally, the proposed converter is a voltage-source based series-resonant converter used for controlling output power, and minimizing the control complexity. This paper also proposes a concept of AC-AC converter based three phase Induction Heating applications.

Part I of this report surveys the basic theory of induction heating and heat flow in an inductively heated steel cylinder. Part II describes an induction heating system now in use at the Watervliet Arsenal, and applies the theory of Part I to this system.

Part I of this report surveys the basic theory of induction heating and heat flow in an inductively heated steel cylinder. Part II describes an induction heating system now in use at the Watervliet Arsenal, and applies the theory of Part I to this system.

An induction heating device includes a handle having a hollow interior and two opposite ends, a wrist connected to one end of the handle, a U-shaped pole piece having two spaced apart ends, a tank circuit including an induction coil wrapped around the pole piece and a capacitor connected to the induction coil, a head connected to the wrist and including a housing for receiving the U-shaped pole piece, the two spaced apart ends of the pole piece extending outwardely beyond the housing, and a power source connected to the tank circuit. When the tank circuit is energized and a susceptor is placed in juxtaposition to the ends of the U-shaped pole piece, the susceptor is heated by induction heating due to magnetic flux passing between the two ends of the pole piece.

A novel susceptor concept for metal-mesh susceptors, designed to achieve uniform in-plane temperatures during induction heating, is documented. The process involves redirecting eddy-current flow patterns in the resistive-mesh susceptor by specifically designed cut patterns in the mesh. A theoretical model was developed to predict heat generation in metal-mesh susceptors with any described network pattern. initial results for cut patterns show significant changes in heating compared to an uncut mesh. Cut patterns can be optimized to reduce temperature gradients in the susceptor to within the processing window of the composite. Experimental results are presented for qualitative comparisons.

In this paper 32 KHZ Single phase Single switch Parallel Resonant converter topology (SSPR) using power MOSFET is simulated using MATLAB simulink for the different duty cycle and the THD, Power with respect to change in duty cycle is compared . The workingcoil is the combination of R, L in parallel with C which produces the output power of 1.7KW to 3KW with variation in duty cycle at higher value in duty cycle we get less THD and more power. The operating frequency is selected nearer to the resonant frequency for the improvement performance. The experimental set up of this SSPR Inverter in the induction heating application for the domestic purpose is implemented is depicted and this validates the implementation of quasi resonant using IGBT for domestic applications.

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Induction-heated plasma torch operates with an input of 1 Mw of direct current of which 71 percent is transferred to the plasma and the remainder is consumed by electrical losses in the system. Continuous operation of the torch should be possible for as long as 5,000 hours.

This paper presents different techniques on fault diagnosis in static converters used to supply and control induction heating systems. These techniques allow the detection and the location of the failed semiconductor switches. After an overview of the device with its main features in healthy state, we have afterwards focused on the fault detection and diagnosis in three electronic power converters which constitute the power generator of the induction furnace. For uncontrolled three-phase rectifier, three external methods based on the analysis of lines currents are used: Average currents method, Current space vector trajectory, called Current Park’s vector approach and Spectrum analysis. For the buck converter (chopper), analytic redundancy approach, based on the residues calculation, is used. For the series resonant inverter, a simple and efficient method based on the average voltages analysis, allows the detection and the location of the power switch in fault. The obtained simulation results, in Matlab/Simulink, are presented and discussed. They reveal that the proposed diagnostic techniques are of great interest.

This paper presents different techniques on fault diagnosis in static converters used to supply and control induction heating systems. These techniques allow the detection and the location of the failed semiconductor switches. After an overview of the device with its main features in healthy state, we have afterwards focused on the fault detection and diagnosis in three electronic power converters which constitute the power generator of the induction furnace. For uncontrolled three-phase rectifier, three external methods based on the analysis of lines currents are used: Average currents method, Current space vector trajectory, called Current Park’s vector approach and Spectrum analysis. For the buck converter (chopper), analytic redundancy approach, based on the residues calculation, is used. For the series resonant inverter, a simple and efficient method based on the average voltages analysis, allows the detection and the location of the power switch in fault. The obtained simulation results, in Matlab/Simulink, are presented and discussed. They reveal that the proposed diagnostic techniques are of great interest.

This paper presents different techniques on fault diagnosis in static converters used to supply and control induction heating systems. These techniques allow the detection and the location of the failed semiconductor switches. After an overview of the device with its main features in healthy state, we have afterwards focused on the fault detection and diagnosis in three electronic power converters which constitute the power generator of the induction furnace. For uncontrolled three-phase rectifier, three external methods based on the analysis of lines currents are used: Average currents method, Current space vector trajectory, called Current Park’s vector approach and Spectrum analysis. For the buck converter (chopper), analytic redundancy approach, based on the residues calculation, is used. For the series resonant inverter, a simple and efficient method based on the average voltages analysis, allows the detection and the location of the power switch in fault. The obtained simulation results, in Matlab/Simulink, are presented and discussed. They reveal that the proposed diagnostic techniques are of great interest.

An induction heating head includes: a length of wire having first and second opposite ends and being wound in a flat spiral shape to form an induction coil; a capacitor connected to the first and second ends of the wire, the induction coil and capacitor defining a tank circuit; and a flexible, elastomeric body molded to encase the induction coil. When a susceptor is placed in juxtaposition to the body, and the tank circuit is powered, the susceptor is inductively heated.

This is a cooling fan mounting construction for the popular 1000W ZVS Low Voltage Induction Heating Board using a standard PC fan 80x80mm. This design also takes care of the PCB mounting spacing. The 1000W ZVS Low Voltage Induction Heating Board can be found on many web shops. Just search for something similar like this "1000W ZVS Low Voltage Induction Heating Board Module Flyback Driver Heater DIY" This design is made with FreeCAD.

Part I of this report surveys the basic theory of induction heating and heat flow in an inductively heated steel cylinder. Part II describes an induction heating system now in use at the Watervliet Arsenal, and applies the theory of Part I to this system.