brushless motor

[vjee]

How does the commutation takes place in a brushless motor?
In the stator using electronic switching or By magnetic coupling in the rotor.
I have the first choice as my answer but I'm just double checking does anyone have an idea? thanks...

 

[KeepItSimpleStupid]

1st choice. Your right.

 

[Vizier87]

what kinda brushless motor? if you mean like the ones we use to cool our laptops, then yeah.

 

[crutschow]

All brushless DC motors that I'm aware of use electronics to provide the commutation voltage to the stator.

 

[colin55]

How does the commutation takes place in a brushless motor?
There is no "commutation" in a brushless motor.
Commutation refers to the energy passing to the rotating part of the motor (the armature or rotor) via slip rings or a segmented set of conductors and brushes.
Is the stator using electronic switching or by magnetic coupling in the rotor. Both answers are correct.
For a DC brushless motor the stator of "field" is switched electronically
For an AC brushless motor such as a squirrel-cage motor, the coupling to the rotor is by magnetic coupling and this coupling produces a current in a few turns on the rotor. The magnetic field produced by the rotor reacts with the outer field to produce rotation.

 

[vjee]

Yes this sounds good. thanks..

 

[crutschow]

How does the commutation takes place in a brushless motor?
There is no "commutation" in a brushless motor.

There is commutation, it's just not mechanical. I was using the word "commutation" in the generic sense of a circuit that periodically switches the current into the motor (stator or rotor as the case may be) to provide a rotating field. Brushless DC motors are also called "electronically commutated" so that is not an incorrect definition.

 

[vjee]

Makes sense..