Re: [EE] Cyclic torque loads on AC motors?

Grainger.com had this info in their catalog, not sure if they still do.  You might try calling/emailing a manufacturer/dealer.  Just like with AC, there's a big difference between average and rms.  AC motors tend to draw a lot of power if they are slowed down which probably happens even with the right motor and a flywheel of any reasonable size (I'm sure a 2 ton steel flywheel would solve the problem, other than start up).  It's been one of my favorite catalogs with a fair amount of specification/educational material on a lot of things (just haven't had much need for those products recently).

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On Saturday, December 7th, 2024 at 3:39 PM, Jason White <[email protected]> wrote:

> That seems believable that temporarily running at 200% of rated torque
> would be frowned upon.
> 
> I actually have a 1/3 HP 3600 RPM 3-Phase motor that I am modeling a piston
> pump to attach to it.
> 
> Is there some rule-of-thumb for appropriately derating this scenario?
> 
> It's rated for half a foot pound of torque full load. I can imagine that
> even cyclic variations from 100% or even 50% of rated full-load torque to
> 0% will be hard on it due to vibration and force on the shaft.
> 
> 
> Looking through the motor catalog, I really don't see very many ratings
> that seem applicable. There is probably a design guide out there someplace.
> 
> [1] http://www.automationdirect.com/pn/MTR2-P33-3BD36
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