The best replacement for ecm motor is psc.

The best alternatives to ecm motor are rated as following:
★★★★★  psc
★★★  variable speed
★★★  psc motor
★★  variable speed motor
★  induction motor

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Speaking about ecm motor, one probably shouldn't forget about psc.

Other search terms related to ecm motor and their ratings are:
★★★★★ psc
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ecm motor
psc
variable speed