Calculating motor inertia

[@frasersteen]

Obviously I've been following these closely. I was literally wondering about this this week. You're clearly doing a very good job of bringing your audience with you in this research. Keep it up, it's gold!

[@rl2109]

That was a detailed expose` of 'the spin zone' for motors! By detailed, I mean that you were down to the weight of the fastening hardware? WOW! Thanks for taking your time to dive deep in this research!

[@Plur307]

I think you are psychic. I literally was about to ask you if you had found a way to quantify the moment of inertia of a given motor/prop combo. This is one of my favorite channels. Keep up the awesome work!

[@Plur307]

The effect of thermal soak is interesting. I know you want to get the true torque abilities of the motor in your results. But I do think there is some importance to leaving the thermal soak in the results. We push these motors pretty hard in our freestyle/racing multicopters. The motors are going to be warm in real world use. I would love to see tests on how aggressive cooling like the Brotherhobby Tornado motors effects sustained power output of the motor. Silver windings are also becoming common in high end motors. I would love to see if the superior heat/electric conductivity of silver really makes a noticeable difference. Your testing setup is very impressive. It has so many useful applications.

[@SiieeFPV]

I don't intend to remove it from the dyno results but I have to compensate for it when calculating inertia. Cooling on the bench, even with a dedicated fan for the motor, is not nearly as good as you'll get in the air. You can also see thermal effects while doing thrust tests, and it can take a surprisingly long amount of time for a motor doing a full power run to actually reach equilibrium temperature, and that can cost quite a bit of thrust compared to what you'd see just doing a quick burst and peak reading. All just even more little factors to think about.

[@MaxBeamer]

Good stuff man subbed and ready for more!

[@Dchongyong]

Hi, am currently working on my thesis topic on this. Was wondering if I could reach you in any way? I have a few questions regarding the way u did your dyno run. Thanks!

[@ahmadgamal3692]

there is rouphly calculation for large motor inertia?????

[@SiieeFPV]

This same method would work on any size of motor, if you've already characterized the torque of the motor you could estimate rotor inertia the same way.

[@ahmadgamal3692]

@@SiieeFPV Ok, but I am a student and my graduation project is to perform motor starting study, I need to know motors inertia by a simple method "roughly calculation" as the project network has many motors and also I do not have dyno.