Has anyone come across any good information comparing 6 step brushless drive versus 3 phase sine wave? My interest is with efficiency, not torque ripple. I would think that peak torque, rms torque, and efficiency would be better with sine. My one test case on a particular motor indicated that over all efficiency was worse due to the fact that the 6 step was running at 100% PWM so the losses by the sine wave heated my electronics more. I appreciate your thoughts, experience, and references on this!