Generator Rotor

Product Specifications

Technical details and manufacturing context for Generator Rotor

Definition

The generator rotor is the central rotating element of a prime mover (engine/generator) system. It consists of a shaft with windings or permanent magnets that rotate within the stator's magnetic field, inducing electrical current in the stator windings. As part of the generator assembly, it transforms the mechanical torque from the engine into alternating current electricity. The rotor is typically constructed with electrical steel laminations to reduce eddy current losses, copper windings for the field or armature, insulation materials to withstand high voltages, and structural steel for mechanical integrity. Key parameters for selection include rated power (50–1000 MW), rated voltage (10–24 kV per IEC 60034), rated speed (1500–3600 rpm), efficiency (95–99% per IEC 60034-2), insulation class (F–H per IEC 60085), temperature rise (80–120 K per IEC 60034-1), vibration level (1.8–4.5 mm/s per ISO 10816), critical speed (1800–4200 rpm), rotor diameter (800–2000 mm), rotor length (3000–8000 mm), material grade (25Cr2Ni4MoV–30Cr2Ni4MoV per GB/T 3077), rotor weight (20–100 t), balancing grade (G2.5–G1.0 per ISO 21940), and cooling method (IC611–IC666 per IEC 60034-6). These values are directory reference ranges and must be confirmed for the specific model and application. The rotor interfaces with the stator, bearings, and coupling to the prime mover. Verification questions include checking the balancing grade, insulation class, and cooling method against the manufacturer's specifications. Maintenance signals include increased vibration, temperature rise, or insulation degradation. Failure boundaries include mechanical fatigue, electrical breakdown, or thermal overload. Always verify model-specific values and standards with the legal manufacturer or supplier.

Working Principle

The rotor rotates within the stator's stationary magnetic field. When the rotor's magnetic field (created by either field windings or permanent magnets) cuts across the stator windings, it induces an electromotive force (EMF) according to Faraday's law of electromagnetic induction. The rotation speed and magnetic field strength determine the output voltage and frequency. The rotor's magnetic field interacts with the stator's magnetic field to produce torque, and the mechanical input from the prime mover is converted into electrical output. The design of the rotor, including its windings, laminations, and cooling, is critical to efficient and reliable operation.

Common Materials

Electrical steel laminations, Copper windings, Insulation materials, Structural steel

Technical Parameters

Parameter	Typical range	Notes & selection driver
Rated Power	50–1000 MW	Determines generator output capacity
Rated Voltage	10–24 kV	Typical for large generatorsIEC 60034
Rated Speed	1500–3600 rpm	Depends on grid frequency and pole count
Efficiency	95–99 %	Higher efficiency reduces lossesIEC 60034-2
Insulation Class	F–H	Determines thermal enduranceIEC 60085
Temperature Rise	80–120 K	Max allowable over ambientIEC 60034-1
Vibration Level	1.8–4.5 mm/s	RMS velocity at bearingISO 10816
Critical Speed	1800–4200 rpm	Avoid resonance during operation
Rotor Diameter	800–2000 mm	Affects mechanical stress and inertia
Rotor Length	3000–8000 mm	Influences critical speed and balance
Material Grade	25Cr2Ni4MoV–30Cr2Ni4MoV	High-strength alloy steel for forgingGB/T 3077
Rotor Weight	20–100 t	Impacts handling and bearing loads
Balancing Grade	G2.5–G1.0	Tighter grade reduces vibrationISO 21940
Cooling Method	IC611–IC666	Defines cooling circuitIEC 60034-6

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

Components / BOM

Rotor Shaft Part
Provides structural support and transmits torque from the prime mover

Material: Forged steel
Rotor Core Part
Provides magnetic path for flux and supports windings

Material: Electrical steel laminations
Field Windings Part
Carry excitation current to create magnetic field (in wound rotor types)

Material: Insulated copper conductors
Retaining Rings Part
Secure end windings against centrifugal forces during rotation

Material: Non-magnetic steel alloy
Permanent Magnets Optional
Provide the rotor field without excitation current on PM machines.

Industry Taxonomies & Aliases

Commonly used trade names and technical identifiers for Generator Rotor.

Applied To / Applications

This component is essential for the following industrial systems and equipment:

Prime Mover (Engine/Generator)

View system integration details

Manufacturers of Generator Rotor

Manufacturer profiles associated with Generator Rotor.

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Frequently Asked Questions

What is the function of a generator rotor?

The generator rotor is the rotating part of a generator that creates a magnetic field. As it spins, it induces an electrical current in the stator windings, converting mechanical energy into electrical energy.

What materials are commonly used in a generator rotor?

Typical materials include electrical steel laminations, copper windings, insulation materials, and structural steel. The specific material grade, such as 25Cr2Ni4MoV–30Cr2Ni4MoV, is used for the rotor shaft.

What are the key parameters to consider when selecting a generator rotor?

Key parameters include rated power, rated voltage, rated speed, efficiency, insulation class, temperature rise, vibration level, critical speed, rotor diameter, rotor length, material grade, rotor weight, balancing grade, and cooling method. These must be confirmed for the specific application.

How should I verify the specifications of a generator rotor?

Always refer to the manufacturer's datasheet and relevant standards such as IEC 60034, ISO 10816, and GB/T 3077. Confirm that the rotor meets the required performance and safety criteria for your installation.

Data Basis

Editorial classification, named public sources where available, and source-reviewed manufacturer records.

Preliminary Technical Classification

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pressure:	Atmospheric to 5 bar (typical generator housing pressure)
other spec:	Max rotational speed: 3000-3600 RPM (50-60 Hz systems), Vibration limits: <2.8 mm/s RMS, Insulation class: F or H (155°C or 180°C)
temperature:	-40°C to 150°C (operating), up to 200°C (short-term overload)

Product Specifications

Industry Taxonomies & Aliases

Applied To / Applications

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Reliability & Engineering Risk Analysis

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