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

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