Generator mode analysis of exterior-rotor PM synchronous machine with Gramme´s winding

This paper presents the study of a multi-pole exterior-rotor permanent magnet synchronous machine as a part of a hybrid drive for a small unmanned aircraft. The electric machine is designed to operate in generator or motor mode. Gramme´s winding is used in the construction of the analysed machine. The paper covers the load test analysis of the electric machine in generator mode. Motor mode tests are neglected in this given paper. In the real aircraft, the generator output is rectified for supplying the on-board equipment, such as batteries and other electrical devices. Hence, the tests are carried out using active load. Based on test results, the corresponding load and short-circuit characteristic is compiled. In addition, the machine´s analytical values of iron and copper losses are determined. Necessity of further study is pointed out.