Optimizing repulsive lorentz forces for a levitating induction cooker

Zingerli, Claudius M.; Nußbaumer, Thomas; Kolar, Johann W.

doi:10.1109/ipec.2014.6870170

Cited by 8 publications

(8 citation statements)

References 5 publications

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“…The mechanical response to this forces can generate acoustic noise. The magnetic force is proportional to the inductor current squared as shown by simulation in [25]. This force can be calculated by integrating the Lorentz force density J ×B.…”

Section: Current Harmonics Effect On Magnetic Forcementioning

confidence: 98%

“…The source of acoustic noise is electromagnetic due to Lorentz forces exerted on the pot bottom that can cause the pot to vibrate producing structureborne acoustic noise. Since this force is proportional to the inductor current squared [25], the acoustic noise generation can be analyzed from the frequencies in the spectrum of i 2 L that lie in the audible range. The relationship between the magnitudes will depend on the pot; and it is out of the scope of this work since it will require to solve a multi-physics problem involving electromagnetic, structural and acoustic phenomena [16].…”

Section: Introductionmentioning

confidence: 99%

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Analysis of the Acoustic Noise Spectrum of Domestic Induction Heating Systems Controlled by Phase-Accumulator Modulators

Villa

Artigas

Beltrán

et al. 2019

IEEE Trans. Ind. Electron.

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In domestic induction heating (IH) applications, the modulation technique applied to the inverter has a high influence on the acoustic noise emissions. These noise emissions must be avoided since they may be audible and annoying to the final user. This paper analyzes the acoustic noise emissions that appear when a series half-bridge resonant inverter is operated with a phaseaccumulator based modulator. This modulation technique has the advantage of operating in the frequency domain, and it is compared with the classical PWM modulator regarding the audible noise generated. The frequencies of the tones in the acoustic noise spectrum are theoretically calculated from the parameters of the phase-accumulator based modulator. The SFM (Spectral Flatness Measure) is used to quantify the number of cases in which tones are generated by the modulation. Two techniques are applied to the phase-accumulator based modulator and their effect is tested. Theoretical results are experimentally verified.

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Section: Current Harmonics Effect On Magnetic Forcementioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

Analysis of the Acoustic Noise Spectrum of Domestic Induction Heating Systems Controlled by Phase-Accumulator Modulators

Villa

Artigas

Beltrán

et al. 2019

IEEE Trans. Ind. Electron.

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“…In the diagram, N is the number of turns per F I G U R E 2 Classification of coil design for generating magnetic field layer, S is the number of layers, and w (Layer number, Turn number) is the corresponding one-turn winding portion. In a multilayer winding coil, windings are wound in the order of w (1,1) to w (1,N) , w (2,N) to w (2,1) , and then again w (3,1) , w (3,N) . In so doing, peak value V L of coil terminal voltage is expressed as follows:…”

Section: Solenoid Coil Structurementioning

confidence: 99%

Design of a coil geometry for generating magnetic field to evaluate biological effects at 85 kHz

Matsubara

Wãda

Suzuki

2018

Electrical Engineering Japan

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In recent years, the use of induction‐heating systems has increased and wireless power transmission (WPT) systems have been discussed. These applications are installed close to a human body. Therefore, it is important to discuss the effects of alternating magnetic fields and to evaluate electromagnetic interference. This paper discusses the design procedure of a magnetic field generator to evaluate the electromagnetic interference at 85 kHz that is being studied in WPT systems for EV and HEV. The magnetic field generator presented in this paper consists of a single‐phase inverter circuit that uses SiC‐MOSFETs and an air–core inductor that is used as the coil for generating a magnetic field. In particular, this paper shows that the coil used for generating magnetic field needs to reduce the winding voltage to generate higher magnetic flux. In addition, this paper presents the design procedure of the proposed coil structure that can satisfy some limited conditions. The experimental results of the proposed system rated at 82 kHz and 100 A are presented.

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“…Its output is connected to DC link capacitor C dc . The boost converter of the stage before the buck converter comprises boost chopper inductor L 1 , switching device Q 6 , and output diode D 6 , and its output is connected to smoothing capacitor C sm . Switching devices Q 1 to Q 6 use IGBT, and Q 1 through Q 4 are connected with the respective lossless snubber capacitors C s1 through C s4 to implement ZVS.…”

Section: Circuit Configurationmentioning

confidence: 99%

“…In the fields of home electronics and consumer appliances, there has been vigorous progress in the commercialization of products that use power electronics that are equipped with inverters that save energy through higher efficiency. Technology for achieving higher efficiency and lower noise includes soft-switching, which has been progressing towards practical application in home electronics and consumer appliances such as electromagnetic cooker and lighting systems in which high frequencies are generated by using series resonance circuits (1)- (6) . The induction-heating cookers that are commonly used in home-use electromagnetic cooking appliances induce heat directly in pans by passing a high frequency current from a resonance-type inverter through a work coil.…”

Section: Introductionmentioning

confidence: 99%

All-metals Induction Heating System with Switching Between Full-bridge and Half-bridge Inverter Configurations

Hirano

Uruno

Isogai³

et al. 2016

IEEJ Journal IA

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An induction heating system is proposed as a new circuit topology for induction-heating cookers that can be used with all metals. This system has a fixed number of work coil turns that switch the inverter between full-bridge or modified half-bridge configuration according to the cookware material and power setting. When heating cookware made of a low-resistivity material such as copper or aluminum, the inverter is switched to the half-bridge configuration; when cookware made of a high-resistivity material such as iron or magnetic stainless steel is heated at high power, the inverter is switched to the full-bridge configuration. The buck converter, which is placed in the stage before the inverter, controls the DC link voltage to adjust the power. In addition, the boost converter placed in the stage before the buck converter is switched between passive filter and active filter modes to reduce the harmonics of the commercial input current and hence improve the power factor. Tests confirm the power conversion efficiency of the inverter and boost and buck converters as well as the power control characteristics of the inverter. High efficiency over a wide power range when heating an iron pan was also confirmed.

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Optimizing repulsive lorentz forces for a levitating induction cooker

Cited by 8 publications

References 5 publications

Analysis of the Acoustic Noise Spectrum of Domestic Induction Heating Systems Controlled by Phase-Accumulator Modulators

Analysis of the Acoustic Noise Spectrum of Domestic Induction Heating Systems Controlled by Phase-Accumulator Modulators

Design of a coil geometry for generating magnetic field to evaluate biological effects at 85 kHz

All-metals Induction Heating System with Switching Between Full-bridge and Half-bridge Inverter Configurations

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