A Novel Hybrid Brushless dc motor/Generator for Hybrid Vehicles Applications

The brushless DC motor is a simple and robust machine, which has found application over a wide power and speed ranges in different shapes and geometries. This paper presents a new configuration for an integrated starter-generator system based on brushless DC motor without permanent magnet technology. The proposed novel motor consists of two magnetically dependent stator and rotor sets (layers), where each stator set includes nine salient poles with windings wrapped around them while, the rotor comprises of six salient poles with no windings. The magnetic field passes through a guide to the rotor then the stator and finally completes its path via the motor housing. To evaluate the motor performance, two types of analysis, namely numerical technique and experimental study have been utilized. In the numerical analysis the finite element analysis is employed, where as in the experimental study, a proto-type motor has been built and tested. The calculated results compare favorably with the test results. Due to the ruggedness of the proposed motor in comparison with the conventional and brushless DC motors it looks very promising for hybrid vehicle.