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

Jason White wrote:
> I think I am going to design it so that the peak torque is 100% the rated
> full load torque. It will likely speed up and slow down each revolution,
> but is unlikely to overheat or anything like that.
> 
> If the bearing races fatigue away, or the motor winding shake themselves
> apart, I suppose I can always get another motor.

You're not proposing to directly couple the motor to the pump, are you?

All of the piston air compressors I've seen, from the smallest plastic
tire inflators to the largest industrial installations, have some sort
of gear or belt speed reduction from the motor to the pump so that both
devices can operate at their optimal speeds.

The only exceptions would be low-pressure diaphram pumps like those used
for aquarium aerators, etc., which often don't use rotary motors at all.

-- Dave Tweed