Dr. Zainal salam; Power Electronics and Drives (Version 2),2002, UTMJB 1 Induction Motor Drive Why induction motor (IM)? ± Robust; No br ushe s. No contacts on rotor shaf t ± Hig h Power/ We ight, Lower Cost/Power ratios ± Easy to manuf ac ture ± Almos t main tena nce -fr ee, exce pt for bea ring a nd othe r ³external´ mechanical parts Disadvantages ± Essenti all y a ³fixed- spee d´ ma chine ± Spee d is deter mi ned by the supply freq uenc y ± To v ary it s spe ed need a variabl e frequenc y s upply Motivation for variable-speed AC drives ± Inve rt er config ur ation i mproved ± Fast s wi tchi ng, high power switches ± Sophi sti cated cont rol str at egy ± Mic ropr ocessor/DSP implement ation Applications ± Convey er line (b elt ) driv es, Rol ler ta ble, Pape r mil ls, Traction, Electric vehicles, Elevators, p ulleys, Air- conditioning and any industrial process that requ ires variable-speed operation. The st ate-of- the -a rt in IM driv es i s such t hat most of th e DC drives will be replaced with IM in very near future.
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