Investigation into a multi-stage rotor rotating magnetic field generator powered by ocean current

In this work, a prototype of ocean current induced rotating magnetic field multi-stage rotor generator was developed. The power can be improved significantly by using multi-stage rotor structure. In order to improve the power of the prototype of the multi-stage rotor generator, theoretical and experimental investigation has been carried on. Simulation on the performance in different parameters of the rotating magnetic field electric generator was conducted, such as effects of the number of permanent magnets and the windings in axial, the turns number of windings, and the distribution of the permanent magnets, etc. The power of optimized electric generator can be raised from 1.2 to 5.7 mW. A test bed was set up to evaluate the performance of the multi-stage rotor generator under water. The simulation results fit the experimental results well. The power of the electric generator increased obviously with the increase of the flow velocity.