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brushless motors general

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sfx81

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Hi. A general question about brushless motors. I heard that if you rotate the shaft of brushless motor, it produces voltage on its terminals.
If a motor takes 9v , 4A and produces 4000 rpm, does that also mean that if we rotate the shaft of motor at 4000rpm we get back 9v ?

Thanks
Kazz
 

bountyhunter

Well-Known Member
I thought if you spun the armature of any kind of DC motor, you would get some voltage out of it.

If a motor takes 9v , 4A and produces 4000 rpm, does that also mean that if we rotate the shaft of motor at 4000rpm we get back 9v ?
No, I think you will get a lot more voltage than that and it will vary depending on what load you place on the leads.
 

bountyhunter

Well-Known Member
I think by definition, if you crank spin the shaft of a DC motor, the voltage you get out is going to be some kind of AC.
 

kchriste

New Member
Forum Supporter
You'll get pulsating DC out of a brushed DC motor. It is doubtful you'll get anything useful out of a brushless DC motor unless you remove the drive circuitry first.
 
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