Cost of three phase and single phase induction motor

[srinaath]

hi guys...
which will be costlier-single phase induction machine or three phase induction machine for same power rating, same rpm speed, same input voltage and current.?

 

[Svein]

hi guys...
which will be costlier-single phase induction machine or three phase induction machine for same power rating, same rpm speed, same input voltage and current.?

Strictly speaking, there is no such thing as a single phase induction motor, but you can "fake" it (see http://www.allaboutcircuits.com/textbook/alternating-current/chpt-13/single-phase-induction-motors/). Since it involves more components, it should be more expensive, but sales volume might tend to equalize the costs.