Winding Diagrams
A comprehensive visual reference library for electric motor, transformer, and coil winding configurations — used by our engineers and trainees every day.
Motor Winding Diagrams
Visual schematics of the most common stator and rotor winding patterns used in single-phase and three-phase induction motors.
Three-Phase Star (Y) Winding
Standard configuration for 3-phase induction motors — all phase windings meet at a common neutral point.
Specifications & Parameters
| Configuration | Star (Y) / Wye |
| Phases | 3-Phase |
| Neutral Point | Common (N) |
| Voltage | Line = √3 × Phase |
| Current | Line = Phase |
| Typical Use | Industrial motors, star-delta starters |
| Starting Method | Star-Delta (Y-Δ) |
| Power Factor | 0.8–0.95 (loaded) |
Three-Phase Delta (Δ) Winding
High-torque configuration — phase windings connected in a closed triangular loop, no neutral point.
Specifications & Parameters
| Configuration | Delta (Δ) |
| Phases | 3-Phase |
| Neutral Point | None |
| Voltage | Line = Phase |
| Current | Line = √3 × Phase |
| Typical Use | High-torque, running configuration |
| Starting Method | DOL or Star-Delta (run mode) |
| Power Factor | 0.85–0.95 (full load) |
Single-Phase Induction Motor Winding
Main and auxiliary (starting) winding arrangement for single-phase motors used in household and light industrial equipment.
Specifications & Parameters
| Type | Single-Phase Induction |
| Main Winding | Low resistance, thick wire |
| Auxiliary Winding | High resistance, thin wire |
| Phase Displacement | 90° mechanical |
| Starting Aid | Capacitor or centrifugal switch |
| Typical Rating | 0.25 – 5.5 kW |
| Typical Use | Fans, pumps, compressors, fridges |
| Supply | 220–240 V AC, 50 Hz |
Transformer Winding Diagrams
Cross-section and schematic views of primary and secondary winding configurations used in power and distribution transformers.
Core-Type Transformer — Cross Section
Primary and secondary windings wound concentrically on each limb of the laminated iron core.
Specifications & Parameters
| Type | Core-Type, Single-Phase |
| Primary Winding | N1 turns, Input voltage |
| Secondary Winding | N2 turns, Output voltage |
| Turns Ratio | N1 / N2 = V1 / V2 |
| Core Material | Silicon steel laminations |
| Flux path | Through central limb |
| Insulation | Varnish / epoxy resin |
| Typical Use | Distribution, power supply |
Coil Winding Types & Patterns
Visual comparison of the main coil winding methods used in electrical engineering — each suited to different applications and performance requirements.
Lap Winding vs Wave Winding
The two fundamental DC armature winding configurations — used in DC motors and generators.
Comparison Table
| Property | Lap |
| Parallel paths | = No. of poles (P) |
| Current capacity | High (multiple paths) |
| Voltage | Lower |
| Best for | Low-voltage, high-current DC machines |
| Property | Wave |
| Parallel paths | Always 2 |
| Current capacity | Lower |
| Voltage | Higher |
| Best for | High-voltage, low-current DC machines |
Motor Connection Diagrams
Terminal connection diagrams for star-delta starters, dual-voltage motors, and direction reversal — critical for correct motor installation and rewinding.
Star-Delta (Y-Δ) Starter Terminal Connections
How to connect a 6-terminal 3-phase motor for star-delta starting — reduces starting current by up to 66%.
Wiring Instructions
| Starting (Star Y) | U2, V2, W2 shorted together |
| Running (Delta Δ) | W2→U1, U2→V1, V2→W1 |
| Supply to | U1 (L1), V1 (L2), W1 (L3) |
| Starting current | 33% of DOL starting current |
| Starting torque | 33% of DOL torque |
| Changeover speed | ~75–80% of rated speed |
| Timer setting | 5–15 seconds (load dependent) |
| Motor terminals | 6 terminals required |
About This Winding Diagram Library
This page is a living technical reference compiled by the engineers and instructors at Gilead Power Engineering Service Limited — updated regularly as we expand our training curriculum.
Diagram Categories
Motor windings, transformer windings, coil types, and connection diagrams — all in one place.
Individual Diagrams
Each diagram includes specs, engineer’s notes, and colour-coded legends for clarity.
Field-Tested
Every diagram reflects real-world configurations our team uses in motor repair and rewind jobs.
Open Reference
This guide is free for students, engineers, and technicians. No login required.
How to use these diagrams
Each tab covers a category of winding configurations. Within each tab, diagrams are presented with:
- An SVG schematic drawn to represent real electrical conventions
- A specification table with key parameters
- An engineer’s note from our field experience at Gilead
- Application tags identifying where each configuration is used
- A colour legend for all lines and symbols in the diagram