wat is brush less motor????

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Qube

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Guys i came to know,brush less motor is used in copters..
i want to build a Quadracopter,so i need 4 DC motors...
Is Brush less motors powerful than motors which has brush????
can u tell me how does brushless motor has advantage over brush motor,
and is it easily available...?
 

thank u shivram,
I came to know,Inner rotor BLDC motor is much effective,and highly reliable has good performance than anyother DC motor

---------- Post added at 11:30 ---------- Previous post was at 11:27 ----------

Wat voltage ratings BLDC motors are available???
 

BLDC motors have a stator winding which induces poles on the rotor to enable it to develop a torque .
There are no contacts to wear and no bad contact to malfunction.
The motor current is compensated,and starting/running torque is high.
It is commonly available as instrument cooling fans with lo/hi CFM delivery as desired .
Hi rel. version/long life version/hi Speed version /all are standard off the shelf items .
 

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