Sidewayskiwi
OK got a new 2-4S 40amp ESC
Which has ESC brake standard
All test OK 
But disconnect battery and motor hard to turn 
Checked all screws mounts etc for distortion nothing
Unplugged ESC (still no battery) 
Motor spins freely----
Plug esc back in motor has handbrake on
1/is this normal for ESC brake??
2/ how does the ESC do this without battery connected??
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solentlife
Braking of a brushed motor is by applying a small voltage in opposition to rotation ... this was common on the electric race cars in the 80's with mechanical speed controllers.
The advent of brushless motors changed that - brushless motors being basically an AC style motor would not do this. But if the motor leads were connected together - the motor would brake itself !
That is what the ESC effectively does ... it shorts the motor leads without shorting the battery if connected.

Here's a video by 'our' Bruce .. that explains it :


I'll fly anything if I can launch it ! Youtube : solentlifeuk
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Sidewayskiwi
solentlife wrote:
Braking of a brushed motor is by applying a small voltage in opposition to rotation ... this was common on the electric race cars in the 80's with mechanical speed controllers.
The advent of brushless motors changed that - brushless motors being basically an AC style motor would not do this. But if the motor leads were connected together - the motor would brake itself !
That is what the ESC effectively does ... it shorts the motor leads without shorting the battery if connected.

Here's a video by 'our' Bruce .. that explains it :


Ah Field effect transistors
Starting to make sense
Guessed the fields are linked
Its surprised how long the field brake works after battery is disconnected
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solentlife
As Bruce says - the voltage is not actually flowing and therefore resides. 

In the case of the two wire short on motor alone - the motor is acting as a generator in effect creating the brake.
I'll fly anything if I can launch it ! Youtube : solentlifeuk
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