{
    "title": "Master Magnet: Attracts non-ferrous metal objects by AC induction!",
    "inventor_name": "Leonard CROW",
    "publication_year": null,
    "device_name": "Master Magnet",
    "goal": "To attract non-ferrous metal objects (e.g., copper, aluminum) using an AC-driven electromagnet that induces currents in the target metal.",
    "problem_addressed": "Conventional permanent magnets cannot attract non-ferrous metals; the device seeks a method to pull such metals using electromagnetic induction.",
    "concept_summary": "An AC-powered coil creates a varying magnetic field that induces a large current in a set of copper washers placed in the core. The washers act as a transformer secondary, generating their own strong, alternating magnetic field that repels the core and, in turn, induces currents in nearby metal objects. The induced currents produce magnetic fields that attract the objects toward the washer surface. Resonant capacitor circuits are used to increase current and magnetic pull.",
    "detailed_description": null,
    "category": "Electromagnetism & Magnetism",
    "principles": [
        "AC induction",
        "Transformer action",
        "Eddy-current attraction",
        "Resonant LC circuit",
        "Magnetic repulsion/attraction"
    ],
    "scientific_domains": [
        "Physics",
        "Electrical Engineering",
        "Magnetics"
    ],
    "mechanisms_of_action": [
        "Induced current in copper washers creates a secondary magnetic field",
        "Secondary field repels the core, allowing the washers to act as a magnetic pole",
        "Induced currents in nearby metal objects generate attractive magnetic forces",
        "Phase-shifting capacitors form resonant circuits to increase coil current"
    ],
    "materials": [
        "Cardboard mailing tube",
        "Wood (dowels, discs, spacer rings)",
        "Copper sheet (washers)",
        "Brass",
        "Soft iron wire or transformer laminations",
        "#14 enamel-covered magnet wire (cotton/linen insulated)",
        "Cotton or linen tape",
        "Insulating varnish or enamel",
        "Non-electrolytic capacitors (80 uF, 250-600 V)",
        "Brass wood screws",
        "Cement"
    ],
    "energy_sources": [
        "AC mains electricity"
    ],
    "inputs": [
        "AC line voltage",
        "Copper washers",
        "Target metal objects"
    ],
    "outputs": [
        "Magnetic attraction force",
        "Heat generated in copper washers"
    ],
    "claimed_performance": "Capable of picking up and holding six or more half-dollar coins (or an equivalent weight of other non-ferrous metal) when powered with a 4 A resonant circuit; coil currents up to 18.5 A in certain configurations.",
    "experimental_evidence": "The author reports that the magnet can lift six half-dollar coins and that coil currents of 4 A, 4.25 A, 17 A, 18.5 A, and 9 A were observed in different schematic configurations. No independent data or peer-reviewed measurements are provided.",
    "replication_status": null,
    "keywords": [
        "AC electromagnet",
        "Induction",
        "Copper washers",
        "Resonant circuit",
        "Non-ferrous metal attraction",
        "Transformer secondary"
    ],
    "related_technologies": [
        "Transformer",
        "Inductive heating",
        "Resonant LC circuits",
        "AC electromagnets"
    ],
    "controversy_level": "medium",
    "confidence_score": 0.9,
    "practicability_score": 0.6,
    "fringe_score": 0.4,
    "evidence_strength": 0.3,
    "risk_score": 0.7,
    "trl_estimate": 4,
    "source_urls": [
        "https://rexresearch.com",
        "https://rexresearch.com/Non-Ferrous-Magnet.pdf"
    ],
    "organizations": [],
    "applications": [
        "Metal sorting and recycling",
        "Industrial material handling",
        "Educational demonstrations of electromagnetic induction"
    ],
    "limitations": [
        "High current draw (up to ~20 A) requires robust wiring and safety precautions",
        "Washers become hot during operation",
        "Attraction limited to objects that fit within the washer geometry",
        "Requires AC mains and resonant tuning for optimal performance"
    ],
    "open_questions": [
        "What is the quantitative efficiency of the attraction mechanism?",
        "Can the design be scaled safely for larger loads?",
        "Are there any long-term health effects associated with the reported \"unhealthy\" sensations?",
        "How does the device perform with different non-ferrous alloys?"
    ],
    "red_flags": [
        "High operating currents and heating hazards",
        "Warning about possible mental/physical sensations",
        "No independent verification or peer-reviewed data"
    ],
    "evidence_quotes": [
        "The maximum magnetic pull is obtained with the series-resonant circuit illustrated in Schematics D. In this hookup, 17 amperes flow through the whole coil, allowing the coil to pick up and hold 6 or more half-dollar coins or an equal weight of other non-ferrous metal.",
        "If the AC line is connected between terminals 1 and 2 of the magnet coil, the current consumed will be around 20 amperes --- quite excessive for use around the house.",
        "The washers, then, act essentially as a transformer secondary.",
        "The induced current sets up a strong, varying magnetic field in the washers. And the direction of this field is such that the washers and the core repel each other.",
        "Do not substitute any other metal in place of the copper washers. Heavy current induced by the washers require that they be made of extremely low resistance metal."
    ]
}