20 kHz Magnetic Field Emission of Induction Cooking Heaters

Abstract

Category: Electromagnetic Compatibility/Exposure Assessment Tags: induction cooking heaters, magnetic field leakage, 20 kHz, exposure assessment, finite element analysis, ICNIRP, household appliances DOI: 10.23919/emc.2004.10805977 URL: ieeexplore.ieee.org Overview This study investigates the magnetic field leakage produced by induction cooking heaters (IH). Using the finite element method, measurements of magnetic field amplitude were taken at varying distances from the IH, utilizing different types and numbers of pans (two S-type, one S-type, one L-type). The results were compared with ICNIRP limits for general public exposure to 20 kHz magnetic fields. Findings - Magnetic field measurements were carried out on four IH models from four manufacturers at a fundamental frequency of 20kHz. - Magnetic flux densities were measured and reported in microtesla (μT), with the maximum value observed being 16 μT at manufacturer A's device (two S-type pans, X = Z = 0, Y = -20 cm). - The amount of field leakage depended on pan size and configuration, with the most leakage observed from the basic model (two S-type pans), followed by one S-type pan, and two L-type pans. - The analysis using the finite element method was validated by close agreement with experimental measurements. Conclusion This research clarifies how pan size and arrangement influence magnetic field leakage from induction cookers, providing important information for estimating magnetic field exposure in domestic and workplace environments. Notably, these findings indicate potential health risks due to differing levels of electromagnetic field exposure—especially since some values approach or may exceed certain safety thresholds. Understanding these exposure levels is crucial for supporting safety guidelines and public health.

AI evidence extraction

Main findings

Magnetic flux density around induction cooking heaters was measured at 20 kHz for four models from four manufacturers and compared with ICNIRP general public limits. The maximum reported value was 16 μT (manufacturer A; two S-type pans; at X=Z=0, Y=-20 cm). Field leakage varied by pan size/configuration, with highest leakage for two S-type pans, then one S-type pan, then two L-type pans; finite element analysis showed close agreement with measurements.

Outcomes measured

• Magnetic flux density (μT) / magnetic field leakage at 20 kHz
• Comparison to ICNIRP general public exposure limits (20 kHz)

Suggested hubs

• who-icnirp (0.78)
  Results are explicitly compared with ICNIRP limits for general public exposure at 20 kHz.

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    "study_type": "exposure_assessment",
    "exposure": {
        "band": "ELF",
        "source": "household appliances (induction cooking heaters)",
        "frequency_mhz": 0.0200000000000000004163336342344337026588618755340576171875,
        "sar_wkg": null,
        "duration": null
    },
    "population": null,
    "sample_size": 4,
    "outcomes": [
        "Magnetic flux density (μT) / magnetic field leakage at 20 kHz",
        "Comparison to ICNIRP general public exposure limits (20 kHz)"
    ],
    "main_findings": "Magnetic flux density around induction cooking heaters was measured at 20 kHz for four models from four manufacturers and compared with ICNIRP general public limits. The maximum reported value was 16 μT (manufacturer A; two S-type pans; at X=Z=0, Y=-20 cm). Field leakage varied by pan size/configuration, with highest leakage for two S-type pans, then one S-type pan, then two L-type pans; finite element analysis showed close agreement with measurements.",
    "effect_direction": "unclear",
    "limitations": [],
    "evidence_strength": "insufficient",
    "confidence": 0.7399999999999999911182158029987476766109466552734375,
    "peer_reviewed_likely": "yes",
    "keywords": [
        "induction cooking heaters",
        "magnetic field leakage",
        "20 kHz",
        "magnetic flux density",
        "finite element method",
        "ICNIRP",
        "exposure assessment",
        "household appliances"
    ],
    "suggested_hubs": [
        {
            "slug": "who-icnirp",
            "weight": 0.7800000000000000266453525910037569701671600341796875,
            "reason": "Results are explicitly compared with ICNIRP limits for general public exposure at 20 kHz."
        }
    ]
}

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