Heavy-duty PCB-stator motor is ‘up to 25% more efficient’
11 February 2025 
Infinitum, the US manufacturer of air-core electric motors, has unveiled a heavy-duty motor with a built in variable-speed drive (VSD) for demanding HVAC fan and pump applications, which it claims is up to 25% more efficient, as well as being 50% lighter and 60% shorter, than conventional motor-and-drive combinations.
The Aircore Heavy Duty motors, available in ratings from 3.73–11.2kW, are said to cut energy consumption, emissions, noise and waste, while delivering high power densities and good reliability. They can produce 10–30Nm of torque.
Like other Infinitum motors, the new motor replaces the copper-wound iron stator found in conventional motors with a lightweight PCB (printed circuit board) stator, said to be ten times more reliable. It uses 66% less copper and no iron, and is much quieter in operation.
Infinitum is producing the motors in a sustainable facility in Austin, Texas, using components that can be re-manufactured and re-used so that they stay in service and don’t need to disposed of in landfills.
“Our new Aircore Heavy Duty brings our award-winning motor system design to the world’s highest-emitting HVAC fan and pump applications – including those that are increasingly used to cool data centres handling AI workloads,” says Infinitum’s founder and CEO, Ben Schuler. “Our talented team has once again raised the bar for efficiency, serviceability and reliability to power the world with less energy, material and waste.”
A rugged exterior protects the motor against dust, dirt and water, and it can be used in harsh outdoor or wet environments, maintaining its high efficiency over a wide range of operating points. There is a choice of bearings, Nema MG1 shafts and frame sizes. As well as HVAC applications, the motors can also be used to power vertical-inline pumps, and CDUs (coolant distribution units) in data centres.
Other claimed benefits of the new motors are that:
- Customers can specify a motor to meet an application’s precise power and speed requirements, thus reducing the power needed per motor, and freeing up a site’s electrical infrastructure for other uses.
- The motors support a choice of communications protocols, including Modbus RTU, BACnet MSTP and analogue.
- Built-in electronics and control software allow users to configure and fine-tune the motor’s operational parameters, while monitoring its performance, carbon emissions, energy consumption, heat and vibration.
- The motors’ modular design makes repairs quick and simple.
- A compact form factor optimises space, reduces the need for wiring, and facilitates direct mounting to pump applications, increasing efficiencies by 10-15%, according to Infinitum.
The new motors are shipping immediately.
Infinitum: LinkedIn
