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Tool Talk Discussion Forum

Electric Motors...3450 vs. 1750 RPM

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Glenn F.

07-22-2006 20:05:05

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A few threads down I posted a question about a Ridgid tablesaw at Home Depot. I appreciate each of your responses. The $440 included the 10% discount good July 27-30. Next weekend I plan on getting the saw.

Now, can someone explain to me the pros/cons of 1725 vs. 3450 rpms? Is it similar to 540 vs. 1000 rpm pto on tractors?

Thanks, Glenn F.

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Bernoulli

07-24-2006 17:18:43

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Re: Electric Motors...3450 vs. 1750 RPM in reply to Glenn F., 07-22-2006 20:05:05

Use 3450RPM for table saws and jointers and other high RPM machines. The 1725RPM motors are fine for band saws etc. Use TEFC (totally enclosed fan cooled) for woodworking and other applications that generate lots of by-product like a metal lathe. Since most of the manufacturers lie about HP, use 12 Amps for 1HP at 110VAC (6Amps at 220VAC). This makes 1.5HP (18 Amps) the practical max for 110 VAC 20 amp circuits.

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jl Sargent

07-23-2006 18:17:55

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Re: Electric Motors...3450 vs. 1750 RPM in reply to Glenn F., 07-22-2006 20:05:05

How the different speeds relate to your saw specifically I cannot say. How these two speeds relate to wear and tear and imbalance and motor life I know alot about. 1800rpm is the best, period. If all else equal then: Its affected by mass imbalance 1/2 as much as a 3600. Its bearings only turn 1/2 as much in a given amount of time. It has more iron in it, has better starting torque. Typically lasts longer than a 3600 because of above mentioned circumstances.

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Coloken

07-23-2006 06:22:21

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Re: Electric Motors...3450 vs. 1750 RPM in reply to Glenn F., 07-22-2006 20:05:05

My air compressor used a 3450 rpm. Then they have to slow it down more. I have guessed that the 3450 motors cost less to build than 1750....who knows??

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buickanddeere

07-23-2006 05:16:30

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Re: Electric Motors...3450 vs. 1750 RPM in reply to Glenn F., 07-22-2006 20:05:05

Doesn't matter. Usually the machine manufcature wants to match the motor rpms to the load if possible. To operate a small diameter but high pressure centrifical pump.I've seen 400 hz power used to get a two pole 23000 rpm motor. All things otherwise identical. A two pole motor is slightly more efficienct than a four pole motor.

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Bus Driver

07-23-2006 04:47:01

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Re: Electric Motors...3450 vs. 1750 RPM in reply to Glenn F., 07-22-2006 20:05:05

For a saw, the 3450 motor is the better choice. It more closley matches the desired blade speed.

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MarkB_MI

07-23-2006 04:22:34

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Re: Electric Motors...3450 vs. 1750 RPM in reply to Glenn F., 07-22-2006 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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