1500kW‑2250kW 6 Pole Three Phase Squirrel Cage Induction Motor AMI 500L6A, IC611, IP55 High Power Electric Motor

The ABB AMI 500L6A is a medium‑large frame modular high‑voltage squirrel‑cage induction motor built on ABB mature AMI product platform, with power coverage of 1500 kW‑2250 kW, 6‑pole configuration, standard IC611 air‑to‑air closed cooling and IP55 protection gradeABB Group. Designed and tested according to IEC and NEMA international standards, this welded‑steel frame motor is intended for S1 continuous heavy‑duty operation. Thanks to its modular mechanical architecture, cooling units, monitoring sensors and auxiliary assemblies can be flexibly configured for project‑specific requirements. It is widely deployed in thermal power, petrochemical, water‑conservancy, cement and metallurgical industries for driving large fans, circulating water pumps, compressors and heavy‑duty process equipmentABB Group.

Core Technical Parameters 

Electromagnetic design is optimized via multi‑operating‑point finite‑element simulation, oriented to medium‑speed 6‑pole load characteristics, including long‑term continuous running and frequent partial‑load conditions for fans and pumps. The stator core is stacked with premium low‑loss silicon‑steel laminations to reduce iron loss, stray loss and magnetic leakage under full‑load and partial‑load cycles. Stator windings adopt high‑grade corona‑resistant magnet wire and go through full VPI vacuum‑pressure‑impregnation treatment. Reinforced winding‑end construction enhances dielectric strength, thermal stability and anti‑electrical‑aging capacity, resisting industrial‑grid voltage fluctuations and repeated startup impulse. For this medium‑large power range, heavy‑duty copper‑bar squirrel‑cage rotor is standard configuration, delivering excellent mechanical rigidity, low rotor loss and well‑balanced starting performance. Each rotor assembly undergoes multi‑stage high‑precision dynamic‑balance calibration to keep vibration and noise strictly within IEC permissible limits for medium‑speed continuous service.

Modular welded steel‑plate housing is the core feature of ABB AMI‑series motors, supporting flexible adjustment of cooling and auxiliary components to match site conditionsABB Group. This AMI 500L6A adopts standard IC611 air‑to‑air closed cooling system. Two independent air circuits are arranged inside the motor: internal hot air circulates in the sealed housing and transfers heat to external ambient air through the top‑mounted air‑to‑air heat exchanger. IP55 enclosure provides reliable defence against dust ingress and water‑spray, making it suitable for humid, dusty industrial environments where open‑ventilated motors cannot operate reliably. For locations lacking sufficient ambient cooling air, IC81W air‑to‑water cooling can be selected to upgrade heat‑dissipation performance.

Bearing system is purpose‑designed for medium‑speed heavy‑load continuous operation. Heavy‑duty rolling bearings are standard for this frame; sliding‑bearing configuration can be supplied for higher power‑end of the range or higher shock‑load applications. PT100 temperature sensors can be factory‑pre‑embedded in stator windings and bearing housings, transmitting real‑time temperature readings to plant DCS system for remote condition monitoring and over‑temperature protection. Space heater can be fitted as option to prevent winding condensation during motor stand‑by periods. For variable‑frequency energy‑saving retrofits, IC616 cooling variant is available to secure adequate cooling airflow at low‑speed operation. Customisation options cover ATEX hazardous‑area modification, high‑altitude adaptation, tropical anti‑humidity & anti‑corrosion coating, special terminal‑box layout and double‑shaft extension to satisfy complex project requirementsABB Group.

Typical driven machinery includes large‑volume induced‑draft / forced‑draft fans, circulating water pumps, process compressors and heavy‑flow centrifugal pumps. The motor supports direct‑on‑line startup or high‑voltage soft‑starter configuration subject to on‑site grid short‑circuit capacity. Every unit undergoes comprehensive factory‑acceptance tests before shipment, including insulation‑resistance test, high‑voltage withstand test, no‑load running test, efficiency verification, vibration and noise measurement. Leveraging ABB proven AMI modular platform, AMI 500L6A delivers high operational reliability, good spare‑parts interchangeability and low total‑cost‑of‑ownership for mission‑critical medium‑speed heavy‑duty industrial processes.