A high-torque electric motor is the type chosen for heavy-load machines such as conveyors, mills, mixers and crushers, where the shaft must deliver substantial turning moment. In an industrial plant, what matters is not power alone but a torque curve able to carry the load from the very first moment of start-up.

Balancing Torque and Speed

At the same kW rating, a low-speed motor produces higher torque, because torque equals power divided by angular speed. For plants with heavy break-away loads, 6-pole (1000 rpm) or 4-pole (1500 rpm) motors are therefore more suitable than 2-pole (3000 rpm) models. Since high-inertia loads demand several times the rated torque during start-up, the locked-rotor and breakdown torque must be calculated correctly.

Withstanding Harsh Duty

In plants running under continuous load, the frame material directly affects service life. A cast iron frame damps vibration and resists mechanical shock better than aluminium. IP55 protection guards against dust and splashing water, while Class F insulation tolerates high winding temperatures. The S1 continuous duty rating is decisive for uninterrupted performance across shifts.

Overload and Protection

High-torque applications require thermal protection, phase-failure protection and, where needed, a soft starter or variable frequency drive. A VFD limits inrush current, protecting both the grid and the mechanical transmission, and tunes torque to demand under variable load. With the right gear ratio, the motor stays within its most efficient speed band.

Specifying the Right Torque for Your Plant

DRG Motor supplies three-phase cast iron frame motors from 0.55 to 355 kW at 400 V / 50 Hz for heavy industrial loads. Once your machine's start-up load, moment of inertia and daily running time are known, the suitable pole count, efficiency class and mounting type (B3 foot-mounted / B5 flange-mounted) are determined together. With Izmir-based manufacturing, spare parts and technical support are delivered quickly.