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and 69.36 km/h, respectively. SFTP-75 is commonly used for emission certification and fuel economy testing for light duty vehicles in United States. This cycle involves both driving in urban areas and high speed road. In this case study, only the second part of this cycle is incorporated. The duration of JP 10-15 is 660 sec and its average speed is 22.7 km/h. A fuel consumption lower than 5.0 l/100 km has been considered acceptable and each topology that Variable Symbol Motor A Motor B Motor C Motor D Stator inner radius rshaft 159 159 162.47 155 Airgap radius rδ 199 199.12 200.84 199.12 Airgap length δ 2 2 2.50 2.12 Number of poles 2p 28 34 48 60 Number of slots Qs 30 36 54 63 Slot opening width bs0 18.50 13.95 12.05 9 Slot top width bss1 18.61 13.96 15 9.01 Slot base width bss2 18.62 13.97 12.46 9.02 Stator tooth width bst 22.42 20.25 7.96 10.53 Slot height hss 25 27 25.92 29 Stator tooth tip height hsw 1 1 1 1 Thickness of stator back hsy 13 11.12 9.95 13 Thickness of rotor back hry 14.5 14.38 11.66 14.38 Magnet height hm 2.5 2.50 3.50 2.50 Pole arc/pole pitch ratio α 0.79 0.78 0.60 0.90 Slot fill factor sf 0.6 0.6 0.60 0.60 Number of conductor per slot nc 34 26 16 14 Number of wires per conductor nw 1 1 1 1 Wire diameter dw 2.906 2.906 3.665 3.264 Number of layers nl 2 2 2 2 Winding factor kw 0.951 0.952 0.945 0.953 Table 5. Optimization design variables results and model comparison (all dimensions in mm). Hybrid Electric Vehicles138