Improving motor and propeller performance: theory and application (part1)

As promised, here is part 1 of our series on motor and propeller theory. Part 1 covers the coil magnet model, Kirchhoff's law for a motor, Back EMF, Kv, Kt, and motor efficiency.

By the end of the first video, you should really understand why is a motor is inefficient and the relation between electrical power, heat and mechanical power. The motor model is constructed part by part. I tried making this series different by giving a lot of examples while being backed by a solid theoretical background. We have more tutorials on our website. If you have any question or comment, my colleague and I will answer questions!

Views: 2140

Comment by Bjorn Nellerson on January 25, 2016 at 5:32pm

So what is the ultimate takeaway to maximize flight time?

Thanks for the tutorial btw :)

Comment by Charles Blouin on January 25, 2016 at 7:33pm

@Bjorn: We are going to get to that! There is no unique solution, but there are bad solutions!

Comment by Muhammad Al-Rawi on January 25, 2016 at 7:58pm

Great video Charles. I am patiently awaiting the next installment :)

Comment by Digital Wings on January 25, 2016 at 8:44pm
Wow fantastic video! Thanks for making it.
Comment by Hector Garcia de Marina on January 26, 2016 at 1:10am

It is very nice Charles! it is a very nice explanation.

Comment by Charles Blouin on January 26, 2016 at 4:37am

Thanks a lot!

Comment by Damian on January 26, 2016 at 11:25am

So what is the ultimate takeaway to maximize flight time?

an Airship...:)

Comment by Damian on January 26, 2016 at 11:28am

to maximise the flight time:

- run the motor atabout 30% of its max power

- match the prop for just right amount of thrust and pitch speed for about 90% of the flight speed

- minimise weight 

-minimise drag

- match the lift for the weight of the airframe 

Comment by Gary McCray on January 26, 2016 at 12:14pm

Great tutorial guys, look forward to more of them.

Comment by Jethro Hazelhurst on January 27, 2016 at 2:39am

I would love to design and build a multirotor motor that uses carbon nanotubes instead of copper wire:

I wonder what exactly are the hurdles to putting something like this into production? Seems like a revolutionary concept not just for multi-rotors, but anything that uses an electric motor (electric cars?).

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