inductor
Enable an AI agent to identify an inductor, assess its electrical, magnetic and physical state, and decide whether it can be measured, installed, operated or replaced in a specified circuit.
Research draft, second pass
A second pass drafted this model: the structure a model of this thing needs, and what is known about it in the world. The line under this one says how the second half was obtained - researched against sources, or recalled without web access, in which case nothing here was read anywhere and every claim is a lead to verify. Unreviewed either way.
Researched by: Codex + Grok
Purpose and description
Enable an AI agent to identify an inductor, assess its electrical, magnetic and physical state, and decide whether it can be measured, installed, operated or replaced in a specified circuit.
An inductor is a two-terminal passive electrical component whose defining property is a specified inductance: it stores energy in a magnetic field produced by current in a conductor, typically a coil, so that the induced voltage is proportional to the time derivative of current.
It can be Identify winding connections and verify the component against markings or documentation.; Measure inductance, resistance and impedance using conditions appropriate to its intended service.; Assess proposed current, frequency, voltage and temperature stresses against documented limits.; Install or reconnect it using verified terminal, footprint and mounting requirements.; Compare replacement candidates using bias response, losses and limits as well as nominal inductance.; Isolate, inspect, derate or retire it when evidence indicates damage or operation outside assessed limits..
Distinguishing features
The component is intentionally used for inductive terminal behaviour; incidental lead or trace inductance alone does not establish its identity.
Its measured impedance must be evaluated over frequency: inductive behaviour within an intended operating range distinguishes it from a resistor or capacitor, while behaviour outside that range need not remain inductive.
An intended magnetic energy-storage or inductive impedance function distinguishes it from an actuator whose winding primarily produces mechanical motion.
For multiple windings, terminal arrangement and intended circuit role must distinguish a coupled inductor or choke from a transformer; winding count alone is insufficient.
Scope
+ Component identity, winding arrangement, core construction and terminal assignment
+ Inductance, impedance, losses and parasitic behaviour under stated conditions
+ Magnetic bias response, saturation behaviour and current limits
+ Thermal performance, insulation integrity and physical condition
+ Circuit compatibility, mounting requirements and replacement suitability
- Complete converter, filter, oscillator or other host-circuit design
- Transformers whose primary identity is energy transfer between separate windings
- Motors, solenoids and relays whose primary function is mechanical actuation
- Material formulations and manufacturing processes for magnetic cores
- Incidental inductance of interconnects that are not identified as inductive components
Characteristics
- Construction
- Wire-wound, multilayer, thin-film or other documented construction; core type and material if known Helps interpret losses, mechanical vulnerabilities and suitable operating conditions.
- Winding and terminal arrangement
- Terminals mapped to windings, taps and documented relative polarity Prevents incorrect connection and identifies cases needing coupled-winding treatment.
- Inductance
- H, with tolerance, frequency, test amplitude, DC bias and temperature Determines whether the component provides the required behaviour under relevant conditions.
- DC winding resistance
- Ω at a stated temperature Supports conduction-loss estimates and detection of winding or connection changes.
- Impedance and quality factor
- Complex impedance in Ω and dimensionless Q versus frequency under stated conditions Shows usable frequency behaviour and losses that nominal inductance does not describe.
- Self-resonant frequency
- Hz, with fixture and measurement conditions Identifies a frequency boundary where parasitic effects materially change terminal behaviour.
- Inductance under current bias
- H versus A at stated temperature; saturation-current criterion where specified Shows whether peak current may reduce inductance below the circuit requirement.
- Thermal current rating
- A with permitted temperature rise, ambient temperature, waveform and mounting conditions Separates heating constraints from magnetic saturation constraints.
- Temperature
- °C at a specified core, winding or case location, with ambient temperature Supports assessment against documented temperature limits.
- Insulation capability
- Documented voltage limits and test conditions between applicable terminals, windings and core Determines whether the component can tolerate the required electrical stresses.
- Condition assessment
- Untested, within assessed requirements, degraded, failed or indeterminate; supported by observations Makes disposition depend on evidence and a specified use rather than appearance alone.
- Host-circuit role
- Installed or proposed circuit position and required operating envelope Makes suitability and replacement decisions specific to actual service.
Also called
Where this came from
wikidata · CC0 1.0
Also registered as vr.tr.inductor
Drafted structure
Bundle to layer to finding to question, as the second pass will find it: 6 bundles · 11 layers · 11 findings · 21 questions.
Inductor identity and construction Establishes what component is present and how its windings and magnetic path are constructed.
A nominal inductance or visual resemblance cannot establish terminal arrangement, construction or component class.
Component identification
Connects the physical component to a supported identity and intended inductive function.
Supported inductor identity
Records the evidence identifying the component as an inductor and any uncertainty about its exact type.
- What markings, manufacturer records or circuit documentation identify this component and its intended inductive function? provenance
- Does its intended role place it within this model or a neighbouring transformer, actuator or interconnect model? boundary
Winding and core arrangement
Describes the electrical connections and magnetic construction relevant to operation.
Verified winding and core description
Records winding count, taps, terminal relationships and documented core, gap and shielding details.
- Which terminals belong to each winding or tap, and what relative polarity is documented where applicable? definition
- What evidence establishes the core material, gap arrangement and magnetic shielding, and which details remain unknown? provenance
Electrical response Captures measured inductive behaviour, winding resistance and frequency-dependent limitations.
Inductance varies with conditions, and parasitic behaviour can make a nominally suitable component unsuitable in service.
Reference electrical properties
Establishes comparable inductance and resistance values.
Conditioned inductance and resistance
Associates electrical values and tolerances with their test conditions and measurement basis.
- What inductance is specified or measured, at what frequency, signal amplitude, DC bias and temperature? measurement
- What DC winding resistance is specified or measured, at what temperature, and how were lead and contact resistance handled? measurement
Frequency-dependent behaviour
Determines how impedance, losses and resonance constrain use.
Usable impedance range
Records impedance behaviour across the frequencies relevant to the proposed circuit.
- What measured or documented impedance and Q curves cover the operating frequency and relevant harmonics? measurement
- Where does self-resonance or other parasitic behaviour prevent this component from meeting the required inductive response? boundary
Magnetic operating envelope Relates current bias and applied waveforms to the available inductance and magnetic limits.
A component can meet its small-signal inductance specification yet provide insufficient inductance during operation.
Current bias response
Characterises changes in inductance with current and temperature.
Bias-dependent inductance margin
Records bias curves and the definition behind any stated saturation-current value.
- How does inductance change over the expected current and temperature range? measurement
- What inductance-drop threshold and test conditions define the stated saturation current, if one is provided? definition
Waveform-dependent magnetic stress
Evaluates the proposed excitation against documented magnetic behaviour.
Excitation compatibility
Connects peak current, bias and winding voltage waveform to the minimum inductance required in service.
- What peak current, DC bias, ripple and winding voltage waveform will this inductor experience? measurement
- Do available curves, calculations or representative tests support operation with sufficient inductance throughout that waveform? action
Losses, temperature and integrity Assesses heating, insulation and evidence of winding or core damage.
Magnetic suitability alone does not establish whether an inductor can operate without excessive heating or insulation failure.
Thermal performance
Relates electrical losses and heat removal to permissible temperatures.
Thermal operating margin
Records applicable current and temperature limits alongside representative operating evidence.
- What temperature-rise criterion, ambient temperature and mounting conditions define the thermal current rating? definition
- What losses and temperatures are measured or supported for the actual current waveform, frequency and cooling conditions? measurement
Winding, core and insulation condition
Collects evidence of faults and determines what additional examination is justified.
Integrity and fault evidence
Records damage observations and electrical deviations without treating continuity alone as proof of health.
- What inspection or electrical evidence indicates an open winding, shorted turns, insulation breakdown, overheating or core damage? measurement
- Which further tests or operating restrictions are justified by that evidence and the documented insulation and temperature limits? action
Circuit integration and disposition Determines whether this component can be installed, retained or substituted in a particular circuit.
Matching nominal inductance does not ensure compatible connections, magnetic interactions or operating performance.
Installation compatibility
Checks electrical, mechanical and magnetic fit at the intended location.
Connection and placement fit
Records footprint, terminal assignment and placement constraints relevant to winding connections and stray magnetic fields.
- Do the footprint, terminal assignment, relative winding polarity where applicable and mounting requirements match the intended installation? action
- What documented or tested spacing, orientation and shielding requirements address coupling to nearby inductors, conductors or magnetic parts? boundary
Service and replacement decision
Turns component evidence and circuit requirements into a justified disposition.
Qualified use or substitution
Records the evidence and remaining uncertainty behind acceptance, derating, replacement or retirement.
- Which circuit requirements must a retained or replacement inductor meet for inductance under bias, losses, resonance, insulation and temperature? boundary
- What evidence supports acceptance, derating, replacement or retirement, and what validation is required before energising the circuit? action
Evidence and external alignment What the world already says about this thing, gathered so the model can be checked against it.
A model that cannot be lined up against existing standards, identifiers and practice cannot be adopted by anyone who already uses them.
Reported evidence
Findings from the breadth pass, kept separate from the structural claims.
Kinds and varieties
Reported by the breadth pass; each item needs checking against its source before it becomes normative.
- air-core inductor (including RF coils and solenoids without a ferromagnetic core)
- ferrite-core inductor (including ferrite beads used as RF chokes)
- iron-core / laminated-core inductor (power-frequency chokes and filter reactors)
- powdered-iron / distributed-gap inductor (power inductors for SMPS)
- multilayer chip inductor (MLCI / SMD ferrite multilayer)
- wire-wound SMD / axial / radial inductor
- variable inductor (slug-tuned, variometer, switched-tap)
- coupled inductor / transformer-like winding pair used as an inductor (common-mode choke, coupled power inductor)
- Which of these kinds and varieties hold for the sense of inductor this model covers, and on what evidence? provenance
What the second pass must settle
- Does the registry intend this entry to include coupled inductors, common-mode chokes, ferrite beads and intentionally inductive PCB structures, or do neighbouring entries own some of them?
- Which existing Vercy world models already cover this concept or parts of its scope and should be reused?
- Which source-backed measurement conventions should govern comparisons when manufacturers use different inductance, saturation-current and thermal-rating conditions?
- What minimum evidence is sufficient to qualify an unmarked or salvaged inductor for a specified use?
- Which construction-specific extensions are needed for RF, high-current power and air-core inductors without burdening every instance?