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This document describes improvements made to the design of an outer-rotor direct-drive permanent magnet generator for wind turbines. Finite element analysis and optimization techniques were used. Cogging torque, which affects starting torque, was reduced by optimizing the magnet arc width and slot opening width. A prototype 20 kW, 211 rpm generator was built and test results confirmed satisfactory operation and improvements over an earlier prototype, including lower mass and starting torque and improved eff

Author

Helicon1

Language

EN