Here, *P*_{2,}_{L} is the mechanical power, *P*_{2,inv} is the inverter power, and *ω*_{2,}_{m} is the rotor rotational speed, which depends upon the vehicle speed. The fault-level-dependent efficiencies have a form similar to Eqs. (7) and (8)Display Formula

(11)$\eta SPMSM2,prop(\omega 2,m,sc,P2,inv,sc,\sigma )\u2245a1(\sigma )+b1(\sigma )\omega 2,m,sc\u2003+c1(\sigma )\omega 2,m,c2+d1(\sigma )P2,inv,sc+e1(\sigma )w2,m,scP2,inv,sc$

Display Formula(12)$\eta SPMSM2,gen(\omega 2,m,sc,P2,L,sc,\sigma )\u2245a2(\sigma )+b2(\sigma )\omega 2,m,sc\u2003+c2(\sigma )\omega 2,m,sc2+d2(\sigma )P2,L,sc+e2(\sigma )w2,m,scPL,sc$