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Abstract-Electrically excited synchronous machines with brushes and slip rings are popular but hardly used in inflammable and explosive environments. This paper proposes a new brushless electrically-excited synchronous motor (BEESM) with a hybrid rotor. It eliminates the use of brushes and sliprings so as to improve the reliability and cost-effectiveness of the traction drive. The proposed motor is characterized with two sets of stator windings with two different pole numbers to provide excitation and drive torque independently. The paper introduces the structure and operating principle of the machine, followed by the analysis of the air-gap magnetic field using the finite element method (FEM). The influence of the excitation winding's pole number on the coupling capability is studied and the operating characteristics of the machine are simulated. These are further examined by experimental tests on a 16 kW prototype motor. The machine is proved to have good static and dynamic performance which meets the stringent requirements for traction applications.Index Terms-Brushless excitation, finite element method, hybrid rotor, magnetic field modulation, synchronous machines.

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