New bearingless generator with buoyant rotor for large direct-drive wind turbines

Rotor losses in laminated magnets and an anisotropic carbon fiber sleeve

High speed fault tolerant permanent magnet machines have strong asynchronous airgap harmonics, making them susceptible to rotor eddy-current losses. These losses can be reduced by using novel high resistivity materials like plastic bonded magnets and carbon fiber reinforced retaining sleeves. This paper examines by numerical studies the...

Influence of stator slotting on the performance of permanent-magnet machines with concentrated windings

The use of slotted stator permanent-magnet machines with concentrated windings is increasing in industry. In this paper, the effect of the slot opening on flux linkage, internal voltage, mean torque, rotor eddy current loss and stator iron losses is evaluated. This gives new insight into the influence of slotting on the performance of machines...

Design Challenges and Potentials of HTS Synchronous Motor for Superbus

This paper discusses the possibilities of applying high temperature superconducting (HTS) synchronous motor to Superbus, an alternative and sustainable type of public transportation developed at TU Delft. Two important factors within the Superbus drive that influence the operating range are weight and efficiency: increasing the weight results in...

Possible Solutions to Overcome Drawbacks of Direct-Drive Generator for Large Wind Turbines

Investigation on the Possible Use of Magnetic Bearings in Large Direct Drive Wind Turbines

A direct drive generator used in wind turbine has high energy yield compared to other drivetrain topologies and low maintenance is expected as the technology matures. On the other hand direct drive generator weight and size increases rapidly when scaled up to larger units. This paper will investigate the possibility of weight reduction of large...

Quantum control for an experimental contactless energy transfer system for multiple users

Analytical modeling of a permanent-magnet synchronous machine in a flywheel

Direct drive wind turbine generator with magnetic bearing