difference

[raviram87]

what is the diffrence between brushed and brushless dc motors? can anyone please help me....

 

[Papabravo]

A brush is an element that makes contact with a winding on the rotor. As the shaft rotates the brush looses contact with one side of a winding and makes contact with another side effectively reversing the polarity of the current flow. In a brushless motor there are no brushes. Instead the are hall efect position sensors that locate the rotor. With this position information a controller can select the winding to energize to exert maximum torque.

Google and Wiki are your firends. You should become better aquainted.
Top Hit -> https://en.wikipedia.org/wiki/Brushless_DC_electric_motor

 

[raviram87]

if i mechanically rotate the shaft on the dc motor... say by using my hand... will i be able to observe any dc output?

that is instead of giving dc power supply and making the shaft rotate, can i don the opposite?

 

[Nigel Goodwin]

Yes, of course you can - it's then called a dynamo.

 

[Krumlink]

Aka Crank Generator

Brushless motors are controlled by a microcontroller system, often right inside of the rotary housing.

Brush Motors are very basic, with teh controller circuitry attaching to them from the outside.