27-12-2012, 06:43 PM
PERMANENT MAGNET BRUSH LESS DC MOTOR DRIVE
PERMANENT MAGNET BRUSH.ppt (Size: 1.2 MB / Downloads: 30)
INTRODUCTION
Definition:-
“When the functions of commutator and brushes were implemented by solid-state switches, maintenance-free motors were realised. These motors are now known as brushless dc motors”
TYPES OF PERMANENT MAGNET MATERIALS
Alnicos
Ferrites
Rare earths
ADVANTAGES
Better speed versus torque characteristics
High dynamic response
High efficiency
Long operating life
Noiseless operation
Higher speed ranges
APPLICATIONS
Constant load
Varying loads
Positioning applications