brushless motors general

S

sfx81

New Member

• Sep 5, 2009

• #1

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

 

B

bountyhunter

Well-Known Member

• Sep 5, 2009

• #2

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 ?

Click to expand...

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.

 

S

sfx81

New Member

• Sep 5, 2009

• #3

you mean two terminal brushed one as well ?
Would that be ac or dc ?

Thanks

 

B

bountyhunter

Well-Known Member

• Sep 5, 2009

• #4

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.

 

K

kchriste

New Member

Forum Supporter

• Sep 5, 2009

• #5

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.