Synchronous versus Asynchronous drum motors

No Oil, No Risk of Contamination

Asynchronous motors rely on oil for cooling. This introduces a risk that’s hard to ignore. Over time, seals can wear out or belt tension can push the motor past its design limits. When oil leaks occur, they often go unnoticed until there’s already been damage, or worse, contamination inside the production zone.
NGI’s synchronous drum motors are completely oil-free. Without oil, there’s no chance of leaks, no seals that require regular checks, and no risk of oil entering your food zone. This significantly reduces food safety risks and simplifies compliance with HACCP and other hygiene standards.

High Efficiency Backed by Data

One of the most compelling reasons to switch is energy efficiency. NGI’s synchronous motors convert up to 95% of electrical input into mechanical output. By contrast, asynchronous motors suffer from substantial internal energy losses caused by iron, copper, and mechanical friction.

The impact of this difference is real. In one case, a food processor saved over €500 per motor per year in electricity alone. With dozens of motors in use, the cost savings added up quickly.

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Constant Torque Across All Speeds

Asynchronous motors lose torque at lower speeds, making them difficult to use in variable-speed processes unless oversized. This can lead to unnecessary energy consumption and a more complex parts inventory.

NGI’s synchronous motors maintain full torque across a wide speed range. Whether you’re running high-speed packaging lines or delicate product handling at slower speeds, one motor can handle both. This improves flexibility and reduces the number of motor variants you need to keep in stock.
In one installation, just three synchronous motor types replaced over several asynchronous models, helping the customer simplify inventory and reduce maintenance complexity. Read the Marel case story here

Torque-speed curve comparisons confirm the advantage. NGI synchronous motors offer a flat torque curve from 10% to 100% of rated speed, which is ideal for food lines with start/stop operation or process variability.

Lower Operating Temperatures Extend Lifespan

Synchronous motors run cooler because they are more efficient. There’s less heat loss inside the motor, and no need for oil to assist with cooling. This has a direct effect on the lifespan.

During performance testing, our motors consistently operate below 40°C at full load. Lower temperatures reduce stress on insulation and bearings, which helps extend the mean time between failures (MTBF). This means fewer breakdowns, fewer emergency repairs, and longer service intervals.