How to Calculate Rotor Inertia and Required Power for BLDC Motor in EV Applications

Hello to experts. My first query here on this forum.



I'm working on a couple of projects, one of which is in the Electric Vehicle domain. As part of the design, I'm trying to understand one aspect of a BLDC motor which I'm unable to currently.


Being a motor fundamentally, the motor should still have some "self inertia" which has to be overcome before the motor starts rotating.



I'm trying to figure out the amount of power needed to overcome that inertia.



I also have been looking/reading up on BLDC motor construction. It appears since there are no "brushes" or friction inducing  that the only inertia the motor might have, is the weight of the rotor itself.



Are there any specifications of a motor, specifically a BLDC motor that could help me measure/compute what I'm looking for? I have background in Electrical/Electronics, but my knowledge of EM and Motors is very limited. Any help/guide/pointers would be greatly appreciated.


Thanks a ton in advance for your help.


Regards,
Deepak

Efficiency is a major advantage of BLDC motors because the total rotational force (torque) can be continuously controlled by them. On the other hand, the brushed motors achieve maximum torque only at a few rotational levels. Larger magnets would have to be used for a brushed motor to achieve the same torque as a brushless version. That’s why even tiny BLDC motors can generate considerable power.