11-08-2012, 04:32 PM
Induction Motor
induction motor.ppt (Size: 2.76 MB / Downloads: 316)
Why induction motor (IM)?
–Robust; No brushes. No contacts on rotor shaft
–High Power/Weight ratio compared to Dc motor
–Lower Cost/Power
–Easy to manufacture
–Almost maintenance-free, except for bearing and other mechanical parts
•Disadvantages
–Essentially a “fixed-speed” machine
–Speed is determined by the supply frequency
–To vary its speed need a variable frequency supply