Electrical Coil Winding Course

Lesson 1 • Inductance and Capacitance Basics

Defines self-inductance, mutual inductance, and parasitic capacitance in wound components. Prepares students to predict coil behaviour in AC circuits.

Lesson 2 • Basic Electrical Concepts

Covers voltage, current, resistance, and Ohm's Law as applied to winding circuits. Establishes the quantitative language used throughout the course.

Lesson 3 • Electromagnetic Induction Principles

Introduces Faraday's and Lenz's laws governing induced voltage. Provides the theoretical basis for understanding why coil geometry affects output.

Lesson 1 • Wire Insulation and Coatings

Covers enamel, polyester, and polyimide coatings along with thermal class ratings. Ensures correct insulation selection to prevent inter-turn shorts.

Lesson 2 • Varnishes, Potting, and Encapsulants

Reviews impregnating varnishes, epoxy potting compounds, and conformal coatings for moisture and vibration protection. Prepares students for post-winding finishing processes.

Lesson 3 • Bobbins, Formers, and Spacers

Describes plastic, phenolic, and ceramic bobbins plus layer separators and end flanges. Proper former selection controls winding geometry and insulation integrity.

Lesson 4 • Conductor Wire Types and Gauges

Examines copper and aluminium magnet wire, AWG sizing, and resistance per unit length. Directly informs wire selection decisions in later winding tasks.

Lesson 1 • Winding Workspace Setup

Establishes ergonomic bench layout, wire tensioning stands, and safety practices. A properly organised workspace reduces errors and repetitive-strain injuries.

Lesson 2 • Tension Control and Wire Lay

Explains consistent tension application and close-wound versus space-wound lay patterns. Uniform tension prevents wire damage and ensures predictable coil dimensions.

Lesson 3 • Common Hand Winding Defects

Identifies crossed turns, loose layers, and insulation damage with root causes. Defect recognition at this stage prevents costly rework in production.

Lesson 4 • Counting and Tracking Turns

Teaches manual turn counting, tally marks, and mechanical turn counters. Accurate turn tracking is critical to meeting inductance and turns-ratio specifications.

Lesson 1 • Winding Machine Types and Components

Surveys spindle, flyer, and toroidal winding machines and their key assemblies. Understanding machine architecture enables correct setup and fault diagnosis.

Lesson 2 • Programming Winding Parameters

Explains entering turns count, pitch, speed, and layer data into machine controllers. Accurate parameter entry translates design specifications into machine actions.

Lesson 3 • Machine Setup and Tooling

Details arbor selection, bobbin mounting, wire guide alignment, and tooling changeover. Correct setup is the primary determinant of dimensional accuracy.

Lesson 4 • Machine Troubleshooting and Maintenance

Addresses wire breaks, traverse faults, and tension drift with corrective actions. Routine maintenance minimises downtime and extends machine service life.

Lesson 1 • Electrostatic Shielding Techniques

Describes copper foil and single-turn shields placed between primary and secondary. Shielding reduces common-mode noise and improves high-frequency performance.

Lesson 2 • Transformer Design Fundamentals

Reviews turns ratio, volt-ampere rating, and core flux density as design inputs. These parameters drive every winding decision in transformer construction.

Lesson 3 • Secondary and Auxiliary Windings

Covers multiple secondary windings, centre-tap construction, and auxiliary bias windings. Proper secondary placement minimises leakage inductance and coupling imbalance.

Lesson 4 • Primary Winding Procedures

Details layer winding sequence, inter-layer insulation, and lead placement for primary coils. Correct primary construction sets the voltage reference for all secondary windings.

Lesson 1 • Interconnection and End-Turn Lacing

Details phase connection schemes, jumper routing, and end-turn lacing for mechanical stability. Secure end turns withstand vibration and thermal cycling in service.

Lesson 2 • Motor Winding Fundamentals

Covers stator slot geometry, winding pitch, and pole configuration for AC and DC motors. Understanding motor topology determines the correct winding pattern and wire gauge.

Lesson 3 • Inductor Winding for Power Electronics

Addresses gapped core inductors, toroidal chokes, and coupled inductors for switching converters. Correct gap and turns count sets inductance within tight tolerances.

Lesson 4 • Coil Forming and Insertion

Explains coil forming on templates, slot liner installation, and coil insertion tools. Proper insertion prevents insulation damage that causes premature motor failure.

Lesson 1 • Hipot and Dielectric Withstand Testing

Conducts AC and DC high-potential tests to verify insulation withstand capability. Hipot testing is a mandatory safety gate before coil release to assembly.

Lesson 2 • Resistance and Continuity Testing

Uses ohmmeters and four-wire Kelvin measurement to verify DC resistance and continuity. Resistance deviation from spec indicates incorrect wire gauge or turn count.

Lesson 3 • Inductance and Turns-Ratio Measurement

Uses LCR meters and turns-ratio testers to confirm inductance and coupling accuracy. These measurements validate that winding geometry matches the design intent.

Lesson 4 • Dimensional and Visual Inspection

Covers height, width, and lead-length measurement plus visual defect criteria. Dimensional conformance ensures coils fit assembly fixtures and meet drawing tolerances.

Lesson 1 • Varnish Impregnation and Curing

Details vacuum pressure impregnation, dip-and-bake, and UV-cure processes. Proper impregnation seals voids, improves thermal conductivity, and locks turns in place.

Lesson 2 • Work Order and Traveller Management

Explains reading work orders, routing travellers, and recording in-process data. Accurate traveller completion provides traceability from raw material to finished coil.

Lesson 3 • Nonconformance and Corrective Action

Covers defect classification, nonconformance reporting, and root-cause analysis methods. Structured corrective action prevents recurrence and reduces scrap costs.

Lesson 4 • Packaging, Handling, and Storage

Specifies ESD-safe packaging, moisture barrier bags, and storage conditions for wound components. Proper handling prevents damage between production and final assembly.