![]() ![]() ![]() The rotor position feedback from the sensor helps to determine when to switch the armature current. Hall sensors or rotary encoders are most commonly used to sense the position of the rotor and are positioned around the stator. Hence the force acting on the rotor causes it to rotate. The armature coils are switched electronically by transistors or silicon controlled rectifiers at the correct rotor position in such a way that armature field is in space quadrature with the rotor field poles. In this motor, permanent magnet (or field poles) rotates and current carrying conductors are fixed. ![]() Unlike conventional brushed type DC motor, wherein the brushes make the mechanical contact with commutator on the rotor so as to form an electric path between a DC electric source and rotor armature windings, BLDC motor employs electrical commutation with permanent magnet rotor and a stator with a sequence of coils.
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