Abstract: In order to meet the requirements of efficient operation over a wide speed and power range based on the operating characteristics of the air turbine, the key parameters of an interior permanent magnet synchronous generator are preliminarily designed, and its 2D finite element model is established and optimized. Based on the optimized motor size from finite element optimization, a prototype is developed and its main electromagnetic performance is analyzed and tested. Simulation analysis and test results prove that the prototype is suitable for oscillating water column wave energy generation system.