Im curious why we use brushless motors in RC? Is it important to have have maximum torque at 0 rpm with an decreasing slope? Isnt the point to understand your RMS velocity on a track and select a motor and FDR that aligns peak efficiency of the combination to the track?

An asynchronous motor is built for horsepower and the torque curve is the exact opposite of a synchronous motor. Wouldn’t that be a better place to start your hunt for speed?

I understand that if you calculate your rms torque for a track and its skewed towards low rpm synchronous is the way to go and Asynchronous for an application skewed towards higher rpm.

Isnt the point to align the efficiency curve of the motor to the application needs?

i think the critical thing about motors that doesnt get discussed much....that I would like to mention to create context is continuous torque is not what allot of people understand it to be.

you want torque to change velocity. Current creates torque and torque creates acceleration. If it takes 2 or 3 times the current to accelerate versus maintain a speed how come we cant dump 2 or 3 times the current into the motor continuously and just have more torque or more speed all the time? (Assume torque controls speed)

this is why most data that gets published (rarely in RC) shows 2 torque/speed curves and maybe an efficiency curve. One curve (peak or intermittent)is 2 to 3 times higher than the second one. A continuous torque curve (which is what you need to use when selecting the right stuff for an application) is really a peak curve restricted by the motors ability to dissipate heat continuously without exceeding its specifications. Its called a thermal time constant. If a motor is selected and the track you are running on requires and average speed/torque right in the middle of the efficiency curve isnt less heat being wasted and you are spending most of your time in the most responsive portion of the motors capability?

I only explain the torque curves because there is allot of anecdotal data people use to justify a selection....which is ok...and I even recommend things this way sometimes when i dont have something to measure. In robot design we use allot of basic physics that I dont think allot of people are exposed to this combination of information in RC or at least I havent seen it applied. im not here to really prove something to the world but understand if there is a difference. Also when I say robot I mean anything that is controlled by a servo with high/low inertia mismatch and a requirement for high/low dynamics. Robots is a catch all.