INDUSTRY COMPONENT

End Windings

End windings are the exposed coil extensions at the ends of generator stator slots that connect coils to form complete electrical circuits.

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Component Specifications

Definition
End windings refer to the portions of stator winding coils that extend beyond the laminated iron core slots at both ends of a generator stator. These non-active sections provide necessary electrical connections between individual coils to form complete phase windings while allowing mechanical support and insulation. They are critical for electromagnetic performance, heat dissipation, and structural integrity in rotating electrical machines.
Working Principle
End windings complete the electrical circuit by connecting individual stator coils in series or parallel configurations. They carry alternating current during operation, creating electromagnetic fields that interact with rotor fields to generate electricity. Their geometric arrangement minimizes electromagnetic losses, manages mechanical stresses from electromagnetic forces, and facilitates cooling through airflow or liquid cooling systems.
Materials
High-purity electrolytic copper conductors with enamel insulation (Class F, H, or higher), glass-fiber reinforced epoxy resin impregnation, corona-resistant mica tape, silicone-based encapsulants, and structural supports made from non-magnetic stainless steel or composite materials.
Technical Parameters
  • Voltage Rating Up to 27kV
  • Partial Discharge <5 pC at 1.5x rated voltage
  • Temperature Class Class F (155°C) or Class H (180°C)
  • Dielectric Strength Withstands 2E+1000V for 1 minute
  • Vibration Tolerance ≤50 μm peak-to-peak at 100Hz
  • Insulation Resistance >1000 MΩ at 40°C
Standards
ISO 1683, IEC 60034, IEEE 43, DIN EN 60034

Industry Taxonomies & Aliases

Commonly used trade names and technical identifiers for End Windings.

generator end windings stator winding extensions electrical coil connections power generation components electromagnetic winding design End Windings End Windings in Electrical Equipment Manufacturing

Parent Products

This component is used in the following industrial products

Generator Stator

The stationary part of an electrical generator that contains the windings where electrical current is induced.

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Engineering Analysis

Risks & Mitigation
  • Insulation breakdown due to thermal aging
  • Vibration-induced conductor fatigue
  • Partial discharge leading to insulation erosion
  • Corona discharge in high-voltage applications
  • Mechanical deformation from electromagnetic forces
FMEA Triads
Trigger: Thermal cycling exceeding material limits
Failure: Insulation cracking and electrical short circuits
Mitigation: Implement temperature monitoring systems, use thermal class-appropriate materials, and ensure adequate cooling system maintenance
Trigger: Inadequate bracing against electromagnetic forces
Failure: Mechanical deformation and conductor fatigue fractures
Mitigation: Design robust bracing systems with non-magnetic materials, conduct regular vibration analysis, and implement preventive maintenance schedules

Industrial Ecosystem

Compatible With

Interchangeable Parts

Compliance & Inspection

Tolerance
±2mm on axial positioning, ±1° on angular alignment, insulation thickness tolerance ±10%
Test Method
High-potential testing (hipot), partial discharge measurement, insulation resistance testing, power factor tip-up tests, and thermographic inspection

Procurement Evaluation Criteria

Not customer reviews or live demand data. These dimensions support RFQ preparation and supplier evaluation.

Technical documentation
4/5
Manufacturing capability
4/5
Inspection readiness
5/5
Supplier transparency
3/5

These scores are example evaluation dimensions, not real customer ratings, country-specific buyer feedback, or live inquiry activity.

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Frequently Asked Questions

Why are end windings particularly vulnerable to failure?

End windings experience high electromagnetic forces, thermal cycling, and vibration without the structural support of the iron core, making them susceptible to insulation degradation, mechanical fatigue, and partial discharge.

How are end windings cooled in large generators?

Large generators use direct hydrogen cooling (for hydrogen-cooled machines) or indirect water cooling through hollow conductors, combined with strategic baffling to direct coolant flow across winding surfaces.

Can I contact factories directly?

Yes, each factory profile provides direct contact information.

Data Basis

CNFX manufacturer profiles, technical classification, publicly available product information, and ongoing plausibility checks.

Preliminary Technical Classification
This page supports structured research, RFQ preparation, and supplier evaluation. It does not replace buyer-led supplier qualification, standards review, or technical approval.

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End Plates Epoxy Base Resin