Brushless
DC Motor (BLDC)
•The
motor is made up of rotor and stator .
•In
BLDC motor the rotor is a ferromagnetic material (permanent magnet).
•The
rotor may be outside
(Outrunner) or inside (Inrunner) of BLDC motor.
•The
front winding are series connected.
•These
two opposite face coils energized with equal and
opposite polarities.
•So if
one side create north pole then other will create south and vice versa.
•BLDC
is available in single phase, two phase and three phase.
•BLDC
rotates in synchronous speed means the magnetic field
generated by stator are stationary with rotor.
•There
is no slip is present in between rotor and stator.
•The
brushes are absent so there is no
voltage drop across
brushes.
•Speed of BLDC is very high.
•For
determining the position of rotor there is a hall effect sensor.
•BLDC
motor can be control by microcontrollers.
•BLDC
motor can be use where smaller
size and higher output is required.
•There
are two type of stator winding types one is star connected and second is delta connected.
•Delta
winding gives low
torque at
low speed and start winding gives high torque at low speed.
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