Electromagnetic Modeling and Analysis of Multimaterial Cookware for Domestic Induction Heating

Abstract

The performance of induction cooktops (inductor and electronic power converter) is closely related to the inductive properties of the cookware used. Traditionally, they are designed to work optimally with fully ferromagnetic cookware. However, multimaterial cookware with a bottom surface composed of a ferromagnetic material and small pieces of aluminum are nowadays more commonly used. Designing cooktops to also work optimally with this cookwares requires identifying the equivalent parameters, R eq and L eq , obtained from the electromagnetic models of the inductor-load system. Modeling multimaterial cookware, with a large number of inserts, complicates the model design and increases its computational cost. This work presents an equivalent model for multimaterial loads that allows the evaluation of the inductor performance and obtaining the equivalent parameters quickly and accurately. The multimaterial cookware is modeled as a disk of uniform material with equivalent electromagnetic properties, µ r,eq and σ eq , which depend on the properties of each material and the proportion of area they occupy. The equivalent model has been validated by electromagnetic simulation using a FEA tool and by experimental results. Finally, based on the results obtained, an analysis has been carried out to evaluate the importance of design factors such as the choice of the cookware base material and the size, arrangement, and number of inserts.

Single Three-Phase Inverter for Dual-Frequency Induction Heating

“…A typical power supply for the studied load is a voltage source inverter that generates an output voltage in the form of a square wave. This voltage can be expanded into a Fourier series where its selected normalized harmonic rms value is described by (5). Using ( 1) and ( 5), normalized power ( 6) is determined.…”

“…In recent decades, IH systems have found many practical applications and have become a subject of intense research. They are mainly applied in industry [2][3][4], domestic applications [5][6][7] and medicine [8][9][10]. IH technology has been an increasingly attractive research area due to advantages over conventional heating methods [11][12][13].…”