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Tool Talk Discussion Board

Re: Electric Motors...3450 vs. 1750 RPM


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Posted by MarkB_MI on July 23, 2006 at 04:22:34 from (64.31.11.37):

In Reply to: Electric Motors...3450 vs. 1750 RPM posted by Glenn F. on July 22, 2006 at 20:05:05:

It's not a better or worse sort of thing. The two motors are meant for different applications. Since HP = torque x rpm, a 3450 rpm motor will have half the torque at running speed as a 1750 rpm motor of the same rated horsepower.

Of greater interest than the number of poles of the motor is its type. For the motors you'll encounter, the most common types are these three subtypes of the single phase ac induction motor:

Split phase: used when low starting torque is required (e.g. fans) Cheap, small and light. Very common.
Capacitor Start: used when high starting torque is required (e.g. saws, pumps) Bigger, heavier and more expensive than split phase. Also quite common.
Capacitor Start/Capacitor Run: used when high starting torque and high running torque are required (eg. air compressors). Big, heavy and expensive. Only seen on specialized applications.

Hope this answers your question.


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