07-05-2013, 03:56 PM
Brushless DC Motors
Brushless DC Motors.ppt (Size: 1.32 MB / Downloads: 113)
Motor Basics
What is a motor
Converts electrical energy into kinetic energy
Where did it come from
Identification of rotating magnetic field principle by Nicola Tesla in 1882
Introduction of Electric Motor by Nicola Tesla in December 1889 (U.S. Patent 0416194)
Parts of a Motor
End Bell Fastners
Shaft Key & Keyways
Bearing & Brushings
End Ball Flanges
Identification Plates
Wire Warnish
Commutators
Brush Holders
Laminations
Conduit Connection Box
Magnets (Ferrites)
How It Works
When electric current passes through a coil in a magnetic field, the magnetic force produces a torque which turns the motor.
Force in Motor:
F=ILB
F = Force
B = Magnetic Field
L = Length of Conductor
I = Current in Conductor
Torque in Motor:
T = IBA sin θ
A = LW
L = Length of Winding
W = Width of Winding