ABB AMI High Voltage Rib-Cooled Induction Motors
The ABB AMI High Voltage Motor Series (featured model: AMI 450L4A 1000 kW 6.6 kV) is ABB's premier high-voltage rib-cooled squirrel-cage induction motor platform, engineered for severe ambient environments, heavy-duty continuous process loads, and high power density requirements. Utilizing a heavy-duty cast iron or welded steel rib-cooled frame with **IC411 (self-ventilated)** or **IC416 (forced-ventilated for VFD duty)** cooling design, AMI motors provide superior heat dissipation without external heat exchangers. Covering output power ratings from 200 kW up to 8000 kW across high-voltage grid supplies from 2.3 kV up to 11 kV (AMI 400, AMI 450, AMI 500, and AMI 560 frame sizes), AMI motors feature **Vacuum Pressure Impregnated (VPI)** Class H insulation, rated for direct variable speed drive operation with **ABB ACS880 and MEGADRIVE medium voltage inverters**. Designed for uncompromising reliability, ABB AMI motors serve as the direct, modernized replacement for legacy **ABB HXR** cast-iron rib-cooled motors in power plant cooling pumps, ID/FD fans, cement kiln drives, and oil & gas pipeline pumps.
Technical Specifications
| Featured Model | AMI 450L4A (1000 kW, 4-Pole, 6.6 kV 50Hz, VPI Insulation, Foot Mount B3) |
|---|---|
| Brand / Manufacturer | ABB (High Voltage Motors Division) |
| Product Series | AMI Series High Voltage Rib-Cooled Induction Motors |
| Frame Sizes Covered | AMI 400, AMI 450, AMI 500, AMI 560 (4 Key Frame Sizes) |
| Rated Power Range | 200 kW to 8000 kW (270 HP to 10,700 HP) |
| High Voltage Supply | 2.3 kV, 3.3 kV, 6.0 kV, 6.6 kV, 10.0 kV, 11.0 kV AC (50/60 Hz) |
| Cooling & Enclosure Options | IC411 (TEFC Surface Rib-Cooled) / IC416 (Forced Fan Cooling for Wide VFD Range) | IP55 / IP56 Standard |
| Insulation & Bearings | Class F/H VPI Insulation (VFD Inverter Rated); Regreasable Rolling Element or Hydrodynamic Sleeve Bearings |
Documentation & Resources
ABB AMI Series Frame Size, Voltage & Power Rating Matrix
Full selection matrix for ABB AMI high voltage rib-cooled induction motors. Review frame sizes, voltage supply options, typical 4-pole power outputs, and cooling configurations:
| Motor Frame Size | Power Output (4-Pole 50Hz) | High Voltage Supply Options | Cooling & Protection Rating | Bearing & Mount Execution |
|---|---|---|---|---|
| AMI 400 | 200 kW - 630 kW | 2.3 kV, 3.3 kV, 6.0 kV, 6.6 kV | IC411 / IC416 — IP55 / IP56 | Rolling Element Bearings / IM B3 Foot Mount |
| AMI 450 | 500 kW - 1250 kW | 3.3 kV, 6.0 kV, 6.6 kV, 10 kV, 11 kV | IC411 / IC416 — IP55 / IP56 | Regreasable Rolling / Insulated Sleeve |
| AMI 500 | 1000 kW - 2500 kW | 3.3 kV, 6.0 kV, 6.6 kV, 10 kV, 11 kV | IC411 / IC416 — IP55 / IP56 | Hydrodynamic Sleeve Bearings Standard |
| AMI 560 | 2000 kW - 8000 kW | 6.0 kV, 6.6 kV, 10 kV, 11 kV | IC411 / IC416 — IP55 / IP56 | Sleeve Bearings with Forced Lubrication Unit |
Legacy ABB HXR Rib-Cooled Motors to AMI Series Upgrade Guide
Obsolete ABB HXR cast-iron rib-cooled high voltage motors can be directly upgraded to modern ABB AMI motors with 100% exact mechanical shaft center height alignment:
| Legacy ABB Motor Code (Obsolete) | Legacy Power & Voltage | Current AMI Equivalent Model | Key Upgrades & Operational Advantages |
|---|---|---|---|
| HXR 40054 / HXR 400L4 | 400 kW - 630 kW / 6.6 kV | ABB AMI 400L4A Direct Upgrade | VPI Class H insulation, optimized aerodynamic rib-cooling design, lower noise. |
| HXR 45054 / HXR 450L4 | 630 kW - 1000 kW / 6.6 kV / 10 kV | ABB AMI 450L4A Direct Upgrade | Heavy-duty frame, insulated sleeve bearings prevent circulating shaft currents during VFD operation. |
| HXR 50054 / HXR 500L4 | 1000 kW - 1600 kW / 10 kV / 11 kV | ABB AMI 500L4A Direct Upgrade | Matches B3 foot hole centers, lower temperature rise, integrated PT100 temperature sensors. |
| HXR 56054 / HXR 560L4 | 1800 kW - 3150 kW / 11 kV | ABB AMI 560L4A Direct Upgrade | High thermal margin, customizable main terminal box position, forced lubrication options. |
Expert Technical Sourcing & High Voltage System Integration Notes
When replacing older ABB HXR cast-iron rib-cooled motors in critical pumping stations, power plant ID/FD draft fans, or cement kiln drives, switching to current ABB AMI motors provides immediate benefits: advanced VPI insulation rated for high VFD switching harmonics, enhanced thermal efficiency, lower operational noise, and full compliance with international high-voltage standards. Simply supply us with your existing motor nameplate serial number or complete order code (e.g., HXR 450L4 or AMI 450L4A), and our technical engineering team will deliver a 100% compliant high-voltage replacement specification and proposal.
Core Benchmark Model Standard Configurations
- AMI 400M4A (315 kW 6.6kV IC411)
- AMI 400L4A (500 kW 6.6kV IC411)
- AMI 450M4A (630 kW 6.6kV IC411)
- AMI 450L4A (1000 kW 6.6kV IC411)
- AMI 500M4A (1250 kW 10kV IC411)
- AMI 500L4A (1600 kW 10kV IC411)
- AMI 560M4A (2500 kW 11kV IC416)
- AMI 560L4A (4000 kW 11kV IC416)
- ABB HXR 400L4 Motor Replacement
- ABB HXR 450L4 Motor Replacement
- ABB HXR 500L4 Motor Replacement
- ABB HXR 560L4 Motor Replacement
- AMI 400 6.6kV Boiler Feed Pump Motor
- AMI 450 10kV Water Pipeline Booster
- AMI 500 11kV Cement Kiln Main Drive
- AMI 560 11kV Petrochemical Compressor
- ABB HV Rib-Cooled IC411 Induction Motor
- ABB HV Rib-Cooled IC416 VFD Motor
- ABB HV Motor Hydrodynamic Sleeve Bearing
- ABB HV Motor VPI Class H Insulation
