A Lab Model PM Generator With Double Wheel System for Low Head Hydro Resource

This paper presents a PM generator that has double rotors for a low head hydro generation. The aim of the study is to increase the electromotive force and to reduce gear sets because of a simple structure. The generator consists of an armature coil inner rotor and a field permanent magnet outer rotor. The armature coil rotor and the field permanent magnet rotor rotate opposite to each other. The test machine with a prototype generator had tested by the double shaft mechanical system. The mechanical loss of the test machine was measured. Also, operation mechanism of the twin water wheel illustrated to consider opposite rotation. It was clear that the generator operation with double rotors was comforted from test results. The prototype generator rated 50 W was made for testing and the low speed characteristics were verified.