update user manual on electric motor

Documentation/User Manual/3-simulation-models/Electric_Motor.md

@@ -63,21 +63,23 @@ $P_\textrm{el}(n_\textrm{em}, T_\textrm{em}) = \textrm{Delaunay}_\textrm{EM-Map}
 
 The electric machine can be overloaded for a certain period. In addition to the maximum drive and generation torque (which already is in overload condition) the mechanical power the electric machine can generate is required.
 
-The basic principal of the thermal de-rating is as follows: based on the continuous power and the angular velocity for the continuous power as well as the maximum overload time a thermal energy buffer is calculated. During the simulation the difference between the current losses in the electric machine and the losses at the continuous power operating point are integrated over time. If this value reaches the capacity of the thermal energy buffer the electric machine can only deliver the specified continuous power until the thermal energy buffer goes below a certain threshold.
+The basic principal of the thermal de-rating is as follows: based on the continuous power and the angular velocity for the continuous power as well as the maximum overload time a thermal energy buffer is calculated. During the simulation the difference between the current losses in the electric machine and the losses at the continuous power operating point are integrated over time. If this value reaches the capacity of the thermal energy buffer the electric machine can only deliver the specified continuous torque until the thermal energy buffer goes below a certain threshold.
 
 
 $E_\textrm{th,buf} = (P_\textrm{loss,ovl} - P_\textrm{loss,cont}) \cdot t_\textrm{ovl}$
 
-$P_\textrm{loss,ovl} = n_\textrm{T,ovl} \cdot T_\textrm{ovl} - P_\textrm{map, el}(T_\textrm{ovl}, n_\textrm{T, ovl})$
+$P_\textrm{loss,ovl} = P_\textrm{map, el}(T_\textrm{ovl}, n_\textrm{T, ovl}) - n_\textrm{T,ovl} \cdot T_\textrm{ovl}$
 
-$P_\textrm{loss,cont} = n_\textrm{T,cont} \cdot T_\textrm{cont} - P_\textrm{map, el}(T_\textrm{cont}, n_\textrm{T, cont})$
+$P_\textrm{loss,cont} = P_\textrm{map, el}(T_\textrm{cont}, n_\textrm{T, cont}) - n_\textrm{T,cont} \cdot T_\textrm{cont}$
+
+The overload buffer is calculated for both voltage levels of the electric motor. Both, the overload buffer and continuous losses used in the simulation are interpolated with the voltage level of the REESS at average usable SoC level.
 
 In every simulation step the losses of the electric machine are accumulated:
 
 $E_{\textrm{ovl,} i + 1} = E_{\textrm{ovl,} i} + (P_\textrm{loss, i} - P_\textrm{loss,cont}) \cdot dt$
 
-$P_\textrm{loss, i} = T_\textrm{em, mech} \cdot n_\textrm{em} - P_\textrm{map, el}(T_\textrm{em, mech}, n_\textrm{em})$
+$P_\textrm{loss, i} = P_\textrm{map, el}(T_\textrm{em, mech}, n_\textrm{em}) - n_\textrm{em} \cdot T_\textrm{em, mech}$
 
 
-If $E_\textrm{ovl, i}$ reaches the overload capacity $E_\textrm{th,buf}$ the power of the electric machine is limited to the continuous power until $E_\textrm{ovl,i}$ goes below the overload capacity multiplied by the thermal overload recovery factor. Then the maximum torque is available again.
+If $E_\textrm{ovl, i}$ reaches the overload capacity $E_\textrm{th,buf}$ the power of the electric machine is limited to the continuous torque until $E_\textrm{ovl,i}$ goes below the overload capacity multiplied by the thermal overload recovery factor. Then the maximum torque is available again.