The three-phase cast iron frame electric motor is built around a single-piece grey cast iron housing engineered for industrial environments where vibration, shock and continuous load are severe. DRG Motor supplies these units for 400 V / 50 Hz supply, with Class F insulation and IP55 protection.

The Mechanical Edge of a Cast Iron Frame

Compared to aluminium, cast iron offers greater mass and damping capacity, absorbing operating vibration and extending bearing life. In crushing, screening, conveyor and pump duties that carry impact loads, the frame's resistance to flexing keeps the shaft alignment intact.

How the Three-Phase Design Works

The three stator windings are placed 120 degrees apart, and the incoming three phases create a rotating magnetic field. The squirrel-cage rotor follows this field with a small slip. A 4-pole motor turns at roughly 1500 rpm at 50 Hz, a 2-pole at 3000 rpm; the required speed drives the choice.

Thermal Management and Ingress Protection

IP55 seals the motor against dust and water jets, while Class F insulation withstands winding temperatures up to 155 °C. The wide surface and cast cooling fins of the iron frame transfer heat efficiently, holding a stable temperature under S1 continuous duty.

Selecting the Right Cast Iron Motor

Power, speed and mounting are matched to the application: foot-mounted B3, flange-mounted B5 or face-mounted B14. As an Izmir-based supplier, DRG Motor prepares three-phase cast iron motors from 0.55 to 355 kW in IE3 and IE4 efficiency classes and finalises the right configuration with you.