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Brushless DC Motors Are A Type of Synchronous Motor

Brushless DC motors are a type of synchronous motor that uses Hall-effect sensors and electronic commutation to generate a rotating magnetic field in the motor rather than using brushes. BLDC motors can be single, two, or three-phase and use Hall sensors and electronic switching of the phases to rotate the magnetic field and turn the rotor according to the commutation sequence.

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Pathanjali Kumar
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246 views16 pages

Brushless DC Motors Are A Type of Synchronous Motor

Brushless DC motors are a type of synchronous motor that uses Hall-effect sensors and electronic commutation to generate a rotating magnetic field in the motor rather than using brushes. BLDC motors can be single, two, or three-phase and use Hall sensors and electronic switching of the phases to rotate the magnetic field and turn the rotor according to the commutation sequence.

Uploaded by

Pathanjali Kumar
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
Available Formats
Download as PPT, PDF, TXT or read online on Scribd
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Brushless DC (BLDC) Motors

Brushless DC Motors are a type of


synchronous motor
magnetic fields generated by the stator and
rotor rotate at the same frequency
no slip

Available in single-phase, 2-phase, and


3-phase configurations

BLDC Motor Stator

BLDC Motor Rotors

Hall-Effect
If a current-carrying conductor is kept in a
magnetic field, the magnetic field exerts a
force on the moving charge carriers,
tending to push them to one side of the
conductor, producing a measurable
voltage difference between the two sides
of the conductor.

Hall-Effect Sensors
Need 3 sensors to determine the position
of the rotor
When a rotor pole passes a Hall-Effect
sensor, get a high or low signal, indicating
that a North or South pole

Transverse Sectional View of Rotor

Commutation Sequence
Each sequence has
one winding energized positive (current into
the winding)
one winding energized negative (current out
of the winding)
one winding non-energized

Torque-Speed Characteristic

Six-Step Commutation (4-pole)


Hall-Effect Sensors
spaced 60 electrical
degrees apart
6 steps to complete
one electrical cycle
Phase current
switching updated
every 60 electrical
degrees

Essential Elements of a Typical BLDC Motor

BLDC Control

CW

CCW

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