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

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On Saturday, December 7th, 2024 at 9:27 PM, Spehro Pefhany <[email protected]> wrote:

> Not useful for direct drive, but perhaps you could use 1:1 non-circular timing pulleys or gears to even out the torque.
> 
> Best regards, Spehro Pefhany
> 
> > On Dec 8, 2024, at 12:02 PM, Justin Richards [email protected] wrote:
> > 
> > i see you do have a motor and designing a pump.
> > 
> > > On Sun, 8 Dec. 2024, 11:57 Justin Richards, [email protected]
> > > wrote:
> > > 
> > > Looks like a perfect exam question.
> > > 
> > > With a follow question of why and what could be done to make it workable.
> > > 
> > > So a flywheel is not viable.
> > > 
> > > Do you have pump and motor or is it hypothetical.
> > > 
> > > On Sun, 8 Dec. 2024, 06:16 Jason White, [email protected]
> > > wrote:
> > > 
> > > > Suppose I have an AC motor directly cranking a piston pump+check valve air
> > > > compressor without a flywheel or anything like that.
> > > > 
> > > > For 180 degrees of shaft rotation, the motor experiences a load of 2
> > > > Newton-meters while air is exhausted/compressed, and then for the other


A fly wheel helps, but one the motor can get going is of a rapidly limited size.  Like a lot of things it's part of the solution, but completely solving the problem that way isn't practical.  Elipttical pulleys/gears could help, but it's messy to make work and to design, plus in anything other than huge quantity the NRE alone from any company willing to sign on is going to be steep.  Amusingly this is one of those problems that could be helped by hydraulics and an accumulator perhaps, but they hydraulic pump, depending on type adds it's own problems.  Not to mention the loses conveting electricity to hydraulic power, the design difficulty, etc. make that not a useful solution in all but the most important/valuable situations. Of course using an air motor to drive the compressor.... SYSTEM LOAD: 1849!!!


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