831eb72a_es_content_from_Machine_Design__Induction_motor
[0] COST [PMAC] Exhibit higher efficiency, so their energy use is smaller and full return on their initial purchase cost is realized more quickly [Servomotor] Price can be tenfold that of other systems [Induction motor] 
Relatively modest initial cost; higher operating costs
The difference between AC induction, permanent magnet, and servomotor technologies | Motors/Drives content from Machine Design
Induction motor