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.

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Presentation transcript:

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