In equipment that runs under impact and vibration, the housing and bearing design of a motor matter more than raw performance. Crushers, vibrating screens, presses and mills transmit sudden torque peaks and mechanical shocks to the shaft end that would quickly fail an ordinary motor. Heavy-duty, impact-resistant industrial motors are built specifically for these conditions.

Why Cast Iron Wins Against Impact

Aluminium housings offer a weight advantage but risk cracking and deformation under repeated shock loads. A cast iron frame dampens vibration thanks to its mass, channels mechanical shock safely into the foundation and prevents shaft misalignment. This is why cast iron remains the standard choice for heavy-duty motors.

Bearing Selection and Shaft Rigidity

Under impact loading, the bearing arrangement determines service life. Where radial and axial forces act together, oversized reinforced bearings and, when required, cylindrical roller bearings are used. Sizing the shaft diameter to the application torque prevents bending under belt-pulley tension and keeps bearing clearance within limits.

Protection Class and Insulation Strength

Crushing, screening and mining sites are full of dust and moisture. An IP55 rating blocks dust ingress and water jets from any direction, keeping the windings protected. Class F insulation provides thermal margin even at high ambient temperatures, while the S1 continuous duty rating suits uninterrupted shift production.

Choosing the Right Heavy-Duty Motor

For impact applications a motor should be selected by starting torque, speed and mounting type, not by power alone. As an Izmir-based supplier, DRG Motor offers cast iron foot-mounted (B3) and flange-mounted (B5) motors from 0.55 to 355 kW in 2/4/6-pole versions. Share your load profile and we will recommend the correct frame and bearing configuration.