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why 3 phase motors are preferable over single phase motors ?
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Answer Posted / benudhar sahu
1.The 3-phase motor can be made self starting like slip ring induction motor but the single phase motor can be start by connecting some extra components like high resistance,capacitor etc. which is not cost effictive.
2.The efficiency of 3ph motor is about 84% to 90% and for 1ph motor it is 80% to 85%
3.The power factor 3ph motor is about .75 to .85 and for 1ph motor it is .55 to .65
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