Design and experimental evaluation of a compact hybrid excitation claw-pole rotor

This paper focuses on the electromagnetic design and experimental evaluation of an electrically magnetized permanent magnet assisted synchronous machine (EMPMSM). The work is carried out on an existing Lundell alternator where the design of the rotor facilitates features of field strengthening and weakening operation possible including the efficiency improvement. A relatively simple and compact slip ring less rotor with EM and PM excitation is proposed, analysed and tested. A series of 3D FE transient computations are made in order to estimate efficiency at different operation points and with different types of rotor cores: solid iron and powder core. A rotor with the solid iron core is built and tested including different aspects of torque and power loss production.