High-kW electric motors are three-phase induction motors that drive heavy industrial loads across a power range stretching from above 90 kW up to 355 kW. At this power class, design follows different priorities than for small motors: thermal management, mechanical balance and efficiency stability under continuous load come to the fore.

Why High-Power Design Is Different

As power rises, the motor's heat load and mechanical stresses grow with it. High-kW motors therefore use a ribbed cast iron frame, enlarged cooling fins and a reinforced bearing arrangement. The stator windings are wound with a larger copper cross-section so that the full-load temperature stays within the safe limits of Class F insulation, enabling stable operation in S1 continuous duty.

Balancing Speed and Torque

Heavy loads are mostly driven by 4-pole 1500 rpm or 6-pole 1000 rpm versions; the lower speed suits mills, crushers and large fans that demand high torque. Because starting current is significant at high power, star-delta or soft starting is used to limit the inrush impact on the supply.

Why Efficiency Class Matters More at High Power

In high-kW motors, even a small efficiency difference means a large amount of energy in absolute terms, because the power drawn is already high. IE3 Premium and, where possible, IE4 Super Premium classes are therefore preferred; lower losses cut both the energy bill and the cooling load.

DRG Motor High-Power Solutions

İzmir-based DRG Motor supplies high-power three-phase motors up to 355 kW with a cast iron frame, IP55 protection and Class F insulation. Share your application's load profile, speed and mounting type to receive technical support and a quotation for the correct frame size and efficiency class.