ALSTOM AL81G

Description

Product Description:
The AL81G is a high-performance alternating current (AC) asynchronous traction motor manufactured by Alstom for use in electric locomotives and multiple units. It is designed for heavy-haul and high-speed rail applications requiring reliable, continuous power delivery under demanding operating conditions.

Technical Specifications:

• Rated Power: 810 kW (continuous)
• Rated Voltage: 1,280 V AC (3-phase)
• Rated Speed: 1,800 RPM (base speed), up to 3,600 RPM (maximum)
• Rated Current: Approximately 480 A (3-phase)
• Efficiency Class: IE3 / IE4 (premium efficiency)
• Insulation Class: Class H (180°C)
• Cooling Method: Forced air ventilation (IC 411)
• Weight: Approximately 2,800 kg
• Dimensions: Compact housing optimized for bogie mounting

Construction & Materials:

• Stator Frame: Cast iron or welded steel, high rigidity
• Stator Windings: Copper windings with Class H insulation, vacuum pressure impregnated (VPI)
• Rotor: Squirrel cage rotor, die-cast aluminum bars, short-circuit rings
• Bearings: SKF or FAG sealed grease-lubricated bearings, rated for high radial and axial loads
• Housing: Aluminum alloy or cast iron with corrosion-resistant coating

Key Features:

• High power-to-weight ratio
• Low maintenance design with sealed bearings
• Excellent thermal management via forced air cooling
• Vibration-resistant mounting system
• Compatible with Alstom ONIX and AGATE control systems

Applicable Industries:

• Railway traction (freight and passenger)
• Metros and light rail
• Mainline locomotives

Installation Requirements:

• Mounted on bogie frame with specified torque on all mounting bolts
• Alignment tolerance: ±0.1 mm shaft runout
• Connection to inverter via shielded power cables
• Ambient temperature range: -25°C to +45°C

Usage Notes:

• Periodic bearing lubrication check required per maintenance schedule
• Stator windings must be tested for insulation resistance before commissioning
• Do not exceed maximum rated speed under load