Low-power cast iron electric motors are asynchronous motors rated roughly between 0.55 kW and 15 kW, built with a grey cast iron housing instead of aluminium. While aluminium frames are common in this output range, cast iron offers a clear mechanical advantage on lines exposed to vibration, impact and moisture.

Why Choose a Cast Iron Housing?

Grey cast iron has a higher mass damping coefficient than aluminium, which reduces vibration and running noise. It also resists impact and holds its dimensions well, so the bearing seats keep the rotor concentric for years. Integrating the terminal box and feet into the cast frame further improves mounting rigidity.

Technical Features in the Low-kW Class

These motors typically run on a 400 V / 50 Hz three-phase supply with IP55 protection and Class F insulation. Four-pole versions turn at 1500 rpm and two-pole versions at 3000 rpm. With B3 foot-mounted, B5 flange-mounted or B14 face-mounted options, they couple directly to pumps, gearboxes and conveyor drives.

Suitable Applications

Small dosing pumps, packaging lines, mixers, fan units and workshop machines are typical uses for this class. In machines running continuously in S1 duty and expected to last, the heat dissipation of the cast housing lowers winding temperature and extends insulation life.

The Right Choice with DRG Motor

Izmir-based supplier DRG Motor supplies low-kW cast iron motors in IE2 and IE3 efficiency classes with various mounting and speed options. Share your load profile and mounting arrangement and we will help you select the right pole count and frame type.