Copper vs Aluminium Motors in Commercial Oil Expellers

When comparing motors for continuous-duty applications like commercial oil expellers, the winding material — copper or aluminium — significantly affects performance, heat handling, and long-term reliability. Here's how the two compare for this specific use case.

Electrical and Thermal Properties

Copper has notably higher electrical conductivity than aluminium, meaning a copper winding of the same size carries current more efficiently and generates less resistive heat. For motors that run continuously for hours — like those in oil expellers — this heat difference matters over the life of the machine.

Durability Under Continuous Load

Oil expeller motors work under sustained mechanical load, often for 8+ hours a day. Copper's higher tensile strength and better resistance to thermal fatigue make it more tolerant of this continuous stress compared to aluminium, which is softer and more prone to expansion-related wear over repeated heating and cooling cycles.

• Heat Resistance: Copper handles sustained thermal load with less degradation.
• Longevity: Copper windings typically outlast aluminium under continuous industrial use.
• Size Efficiency: Copper carries more current in less space, allowing more compact motor designs.

The Trade-Off: Cost

Copper costs more than aluminium, which is why some budget machines use aluminium windings to reduce upfront price. For a machine that will run daily for years, the reliability and reduced failure risk of copper generally outweighs the higher initial cost — which is why TechVMouta uses copper winding across its oil expeller range.