A new method to find the fractional slot windings structures from a distributed slot windings permanent magnet synchronous machine and comparative study for a HEV application

This paper presents a distributed slot permanent magnet synchronous machine (PMSM). It´s a machine characterized by a distributed windings stator and a surface mounted PM rotor. First, a basic PMSM called “classical” has been studied. Then, we have developed a new method to find the others machines with the same winding distribution on stator but with different rotor pole number so that we have obtained PMSMs with fractional slot windings. From the fractional slot structures developed, we have chosen one to be compared with the basic machine. This comparison gives us several advantages of fractional slot windings structures. However, one more particular point of this paper is the comparative study during the functional cycle of a hybrid vehicle on the point of view losses. We have presented the computation method of the average copper losses and the average iron losses during the functional cycle of a truck. This gives a global view of machines performances assembled during the functional cycle of vehicle.