630kW / 3000V / 2976rpm: ABB AMI 400L2A IP55 Modular Motor

The ABB AMI 400L2A is a 2‑pole modular high‑voltage three‑phase squirrel‑cage asynchronous motor, rated 630 kW, 3000 V, operating speed 2976 rpm, with IP55 protection grade. Built following ABB’s proven modular engineering concept and complying with IEC international standards, this welded‑frame motor supports S1 continuous heavy‑duty operationmotorswech.... Its modular architecture enables flexible configuration of cooling systems, sensors and auxiliary components. Widely used in power generation, petrochemical, water‑treatment and mining industries, it delivers reliable high‑speed drive for compressors, large pumps, blowers and other critical process equipment.

Core Technical Parameters 

Electromagnetic design is optimized for high‑speed 2‑pole working conditions by multi‑point finite‑element simulation. The stator core uses high‑quality low‑loss silicon‑steel laminations to minimize iron loss, stray loss and magnetic leakage during long‑time full‑load running. Stator windings adopt corona‑resistant high‑grade magnet wire and undergo full VPI vacuum pressure impregnation. The robust consolidated winding end structure enhances dielectric strength, thermal stability and anti‑aging performance to withstand grid voltage fluctuations and repeated startup impacts. For this high‑speed 630 kW application, copper‑bar squirrel‑cage rotor is adopted as standard, featuring high mechanical rigidity, low rotor losses and stable starting characteristics. Every rotor passes high‑precision dynamic balance calibration to strictly control vibration and noise, which is essential for 2976 rpm high‑speed operation.

Modular welded steel‑plate frame is the core feature of AMI series motors, supporting flexible selection of cooling, monitoring and auxiliary assembliesmotorswech.... This AMI 400L2A unit is configured with IC611 air‑to‑air closed cooling system. Two independent closed air circuits are implemented: the internal circuit circulates hot air inside the motor housing, and heat is transferred to external ambient air via top‑mounted air‑to‑air heat exchanger. The IP55 enclosure effectively blocks dust, sprayed water and light corrosive vapors, allowing deployment in industrial environments where open‑type motors cannot be applied.

Bearing configuration is optimized for 2‑pole high‑speed rotation. Heavy‑duty rolling bearings are standard; sliding bearings can be selected for enhanced service life under long‑term heavy‑load cycles. PT100 temperature sensors can be embedded within stator windings and bearing housings as factory option, feeding real‑time temperature data to DCS central control system for remote monitoring and over‑temperature protection. Space heater is available to prevent winding condensation during stand‑by periods. When matched with variable‑frequency drives, IC616 cooling variant can be supplied to guarantee sufficient cooling airflow at low‑speed operation. Customizable options include ATEX explosion‑proof modification, high‑altitude adaptation, tropical anti‑corrosion coating, special terminal‑box layout and double shaft extension according to project requirementsABB Group.

Typical driven equipment includes process compressors, large‑flow water pumps and industrial blowers. It supports direct‑on‑line startup or high‑voltage soft‑starter configuration subject to site grid capacity. Each unit completes comprehensive factory acceptance tests including insulation resistance test, high‑voltage withstand test, no‑load running test, efficiency measurement, vibration and noise inspection before delivery. Benefiting from ABB’s mature modular platform, the AMI 400L2A motor provides high reliability, convenient spare‑parts interchangeability and low total‑cost‑of‑ownership for critical high‑speed industrial processes.