BWP's Proprietary Air Core
Enabling Feature: BWP’s Proprietary Air Core
Design Advantage: No Attractive Forces between the Generator Rotor and Stator
Economic Benefit: Direct Drive - Half the Weight
The BWP technology can produce the same torque with less than half the mass (Nm/kg). The air-core stator contains no ferromagnetic material and as such there is no magnetic attraction between the rotor and the stator. This enables lightweight, flexible stator and rotor support structures, while eliminating the iron losses associated with flux reversals in the stator. This breakthrough in torque density shatters the torque limitations that constrain iron-core machines and enables ever-increasing rotor diameters that deliver more than 30% more power output than comparably rated systems in low wind speed environments.
The competitive landscape for direct drive generators is mapped in the figure below and illustrates the superior torque density of the BWP drivetrain, a 50% improvement over the best-in-class PMDD drivetrain. Note our calculation of torque density is based on torque per mass, versus torque per volume as we believe it represents a more relevant figure of merit and is ultimately more closely aligned with the cost of the drivetrain.
