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Question:

Which motor is one with a variable speed from 0 - 2000 rpm?

What is the best choice?AC motor , DC motor, or Capacitor Start motor? Thanks!

Answer:

For what exactly? A fan? A fluid pump? A chicken rotisserie? Different motors for different applications. You gave none!
I prefer a DC motor. A rheostat can be used to control voltage/RPM speed and DC motors are more reliable.

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