End Windings: Voltage Rating Up to 27kV

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

Parameter	Typical range	Notes & selection driver
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

Ranges are indicative industry figures for RFQ preparation, not a supplier commitment. Confirm every value and standard with the legal manufacturer before ordering.

Standards

ISO 1683, IEC 60034, IEEE 43, DIN EN 60034

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

Typical Suppliers & Equivalents

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

A practical evidence checklist for RFQ preparation and supplier evaluation.

Technical documentation

Request current drawings, revision history, and a signed specification sheet.

Manufacturing capability

Verify equipment lists, process limits, capacity, and representative production evidence.

Inspection readiness

Confirm test methods, calibrated equipment, sampling plans, and traceable reports.

Supplier transparency

Check the legal entity, factory address, ownership, certifications, and direct contacts.

CNFX does not score or rank suppliers. Buyers must verify all claims and documents with the legal manufacturer before ordering.

Manufacturers of End Windings

Manufacturer profiles associated with End Windings.

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Compiled and source-reviewed by the CNFX editorial team. Each manufacturer above links to the page on that company's own website where the product is listed, with the date we checked it. How we source and review

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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.

Data Basis

Editorial classification, named public sources where available, and source-reviewed manufacturer records. See the editorial policy.

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.

End Windings