yes it is possible.
Brush commutation of the voltage source with some ESR from battery or voltage regulator causes dips in source voltage when Ra (aka DCR) approaches ESR of the battery which controls lock rotor or Isc or surge at full voltage start.
BLDC drivers still have a ESR or Rs combined with an array of Caps using ESR with \$\tau_1,\tau_2,\tau_3\$ to Vdd and may include choke impedance in CCM mode with feedback transfer function to define source impedance. Neglecting this is why users have so many problems using SMPS driving BLDC motors with start currents 10x rated load. ...But I digress, because you are only concerned with steady-state.
Looking at various BLDC motor torque vs Hp or V vs I at RPM tells you as you know, kRPM/V is no load and Vin - BEMF (@ RPM) gives you net winding voltage to give SS power. Often MPT or maximum Mechanical Power Transfer is at 50% no load RPM. The maximum Torque starts at 0 RPM and is 0 torque at max RPM or is 2x torque and current , if you inadvertently reverse direction at full speed. (With no mech. load)
Meanwhile the peak torque and peak efficiency have higher than 50% no load RPM.
Excitation current is the current with no mechanical load is often 10% of rated max current so in your model or equations you should expect no load power at full RPM =10% of rated power and start power is 1000% of rated power. This 10x factor can be up to 12x in very efficient powerful motors, or 8x is more lossy motors. Motor L/R ratios are important for RPM and commutation frequency as well,as this defines the rate of change in AC current before each next commutation and thus these are well defined ratios in a family of motors and depend on the number of poles, RPM and RdsOn of the driver. For L/(RdsOn+DCR)