Study on the safety assessment and protection design of human exposure to low-frequency magnetic fields in electric vehicles

Abstract

Study on the safety assessment and protection design of human exposure to low-frequency magnetic fields in electric vehicles Tan L, Li G, Xie Q, Xiang Y, Luo B. Study on the safety assessment and protection design of human exposure to low-frequency magnetic fields in electric vehicles. Radiat Prot Dosimetry. 2023 Oct 10:ncad269. doi: 10.1093/rpd/ncad269 Abstract As the power performance of electric vehicles continues to improve, the human body may be exposed to electromagnetic threats in the cabin. This study tested an electric vehicle to analyze the low-frequency magnetic field distribution in the cabin and to assess the safety of human low-frequency magnetic field exposure. A simulation analysis of human electromagnetic exposure was carried out to obtain the magnetic flux density, induced electric field strength and induced current density, and the test results were much lower than the limits specified in GB8702-2014 and the International Commission on Non-Ionizing Radiation Protection, and the relative error between the simulation results and the test results was <15%. This paper investigates the frequency, driving current, vehicle body material and cable layout to explore the law of human body induced electromagnetic field changing with power cable current, and provides theoretical reference for the design of human body low-frequency magnetic field protection. Excerpt "All positions of the electric vehicle magnetic flux density test data are less than the GB8702-2014 and ICNIRP provisions of the public exposure limits through the safety assessment, but the minimum margin value should be strengthened to protect the position to ensure full safety of human low-frequency magnetic field exposure." pubmed.ncbi.nlm.nih.gov

AI evidence extraction

Main findings

An electric vehicle cabin was tested and simulated for low-frequency magnetic field exposure. Measured and simulated results (magnetic flux density, induced electric field strength, induced current density) were reported as much lower than GB8702-2014 and ICNIRP public exposure limits, with relative error between simulation and test results <15%.

Outcomes measured

• Magnetic flux density in vehicle cabin
• Induced electric field strength
• Induced current density
• Agreement between simulation and test results (relative error)
• Comparison to GB8702-2014 and ICNIRP public exposure limits

Limitations

• No human participant population described (appears to be vehicle testing and simulation).
• Sample size and number/type of vehicles tested not stated in the abstract.
• Specific frequencies and exposure magnitudes are not provided in the abstract.
• Health outcomes were not assessed; study focuses on exposure levels vs guideline limits.

Suggested hubs

• occupational-exposure (0.25)
  Assesses low-frequency magnetic field exposure in a vehicle environment; could be relevant to drivers/vehicle use contexts, though population is not specified.

{
    "study_type": "exposure_assessment",
    "exposure": {
        "band": "ELF",
        "source": "electric vehicle",
        "frequency_mhz": null,
        "sar_wkg": null,
        "duration": null
    },
    "population": null,
    "sample_size": null,
    "outcomes": [
        "Magnetic flux density in vehicle cabin",
        "Induced electric field strength",
        "Induced current density",
        "Agreement between simulation and test results (relative error)",
        "Comparison to GB8702-2014 and ICNIRP public exposure limits"
    ],
    "main_findings": "An electric vehicle cabin was tested and simulated for low-frequency magnetic field exposure. Measured and simulated results (magnetic flux density, induced electric field strength, induced current density) were reported as much lower than GB8702-2014 and ICNIRP public exposure limits, with relative error between simulation and test results <15%.",
    "effect_direction": "no_effect",
    "limitations": [
        "No human participant population described (appears to be vehicle testing and simulation).",
        "Sample size and number/type of vehicles tested not stated in the abstract.",
        "Specific frequencies and exposure magnitudes are not provided in the abstract.",
        "Health outcomes were not assessed; study focuses on exposure levels vs guideline limits."
    ],
    "evidence_strength": "low",
    "confidence": 0.7399999999999999911182158029987476766109466552734375,
    "peer_reviewed_likely": "yes",
    "keywords": [
        "electric vehicles",
        "low-frequency magnetic fields",
        "cabin exposure",
        "magnetic flux density",
        "induced electric field",
        "induced current density",
        "ICNIRP",
        "GB8702-2014",
        "simulation",
        "protection design"
    ],
    "suggested_hubs": [
        {
            "slug": "occupational-exposure",
            "weight": 0.25,
            "reason": "Assesses low-frequency magnetic field exposure in a vehicle environment; could be relevant to drivers/vehicle use contexts, though population is not specified."
        }
    ]
}

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