Running BLDC MOTOR without an ESC!!

use ac voltage
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[@ResonantGamingOneHive]

The cap's just providing starting current and forcefully commutating the rotor to a position where the motor can start. Running a motor in this manner results in a lot of inefficiency and wasteful energy. However, it was interesting to see how BLDC can be run in such a method :)

[@RustyShakleford1]

So basically your saying it functions like an ac induction motor?? That's an amazing away to bypass a blown bldc controller

[@kadmow]

@@RustyShakleford1 - well, a BLDC motor is a 3 phase synchronous motor (PM rotor, rather than slipring DC supplied). Driving with 3P AC is how it should be done - using a VFD (or ESC) gets the most out of the device (variable speed, variable power - rather than a single speed appliance, how the world changed with power electronics.
Any 3P motor can be run with 1P, of course it will only develop partial power.
Of course using a heavy transformer (and a powercord) defeats the lightweight packaging needed on RC aircraft, , etc..

[@VRTechArt]

Yes, you are correct👍

[@newmonengineering]

Well actually the capacitor causes a delayed phase shift. Because it could be 90 degrees off phase it will run. But yes it is not as efficient as a true 3 phase controller. Many ac motors also have capacitor start that uses the phase shift of the capacitor and an additional starter winding to get them going in the correct direction. Another way to run a 3 phase motor is by spinning another 3 phase motor with all 3 wires tied together. But that also in not as efficient as a simple 3phase esc.

[@bhxlegend]

The rpm is low because it's just 50-60 hz and we can't increase the frequency so not very useful but still good 🎉

[@Thrive1234]

how do i know where which one of the output cables from the motor should be connected?

[@bhxlegend]

Any wires polarity doesn't matter here

[@JeffRenko]

I have 230vac to 9vac step down transformer will if work?

[@VRTechArt]

Yes, it will work