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Vignesh-bldc

Brushless DC Motors







apresentation
by
VigneshMannar,
GET,
LUCAS TVS.
Significance of brushes in DC Motors
Brush- A contact for supplying or taking electrical energy to a rotatory component
Commutatorand brush arrangement is a mechanical rectifier
Need for brushless motors
Wear and tear in carbon brushesconsof
Sparking incommutatorbrushes
Brush contact drop
To eliminate the above consequences brushless DC motors are developed.
Electronic controllers replaced the mechanical rectifiers resulting in maintenance less motors.
Anoverviewon BLDC
Disassembledview of a BLDC Motor
Block diagram
Bldcmotor= PMAC motor +Electroniccommutator
Brushed motorvsBrushless motors
Pros:
Longlife span
High Efficiency
Less maintenance and lessnoise
Small in Size
Cons:
High Initial Cost
Complex Controllers
Applications
Laser Printers
Hard Disk drives
Hybrid Vehicles
Industrial Automation
Cooling fans
Refrigeration
Speed Torque curve
Have I made myself clear???
Thank You!!!

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