11-08-2012, 04:32 PM
Induction Motor
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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