Motor and electronic are excellent in Tesla. Better with values:
The last Tesla S motor have
97% efficiency
This efficiency decrease mainly during very low loads and/or very low speed.
In Tesla car you have Sic (Tesla is not the only, others bev have too)
Sic have 99% efficiency look at 40mn
in the video
Total is 4% losts.
Not necessary to compare with ice losts, is it ?