Ametek 30 versus Indiana 24 bench test data

[Speo]

Hi guys,



I think Indiana 24 is a far better generator than Ametek 30 (three times more "open volts x shorted amps" than Ametek 30 at any RPM).



Here are the open volts and shorted amps for both motors:



Ametek 30 (4" diameter, 4 7/8" long):

RPM   Volts     Amps

100    3.36        1.00

200    6.71        2.00

300    10.07     3.00

400    13.24     3.95

500    16.60     4.88

600    19.92     5.85

700    23.24     6.83



Indiana 24 (4" diameter, 7 inches long, labeled 24V, 0.5 A, 375 RPM):

RPM    Volts     Amps

100    6.12        1.64

200    12.24     3.28

300    18.36     4.93

400    24.48     6.57

500    30.60     8.21

600    36.72     9.85

700    42.84     11.49



Here are the graphs:



Open volts versus RPM








Shorted amps versus RPM







Open volts x shorted amps versus RPM

[TomW]

Speo;

I do not recall having heard of an "Indiana 24" before?

Got any pictures / specs or anything? Be interested in seeing anything you have on them. Interesting figures.

Cheers.

TomW

[finnsawyer]

What does each unit cost?  Without that information the conclusion may be meaningless, as the Ametek 30 may be intended for smaller diameter mills with a higher cut-in rpm.  It is considerably smaller.

[Speo]

It's the one on the right side, marke as item #52:

Speo

[TomW]

Speo;

Thanks for the photos! No wonder it pushes more being considerably beefier.

Cheers.

TomW

[Speo]

finsawyer,

Regarding "the conclusion may be meaningless":

I am comparing only output data, to see if it makes a better wind generator. The rule of thumb, I guess, should be "the lower RPM the better, the higher output the better". From this ponit of view, Indiana 24 seems to be better than Ametek 30. Why would I like to know the price in order to decide if it's more suitable for making power from wind?

Regarding the price: yes, it's not as cheap as Ametek 30. I sold my collection(kept only one for myself) for 125-150 USD/unit.

Speo

 

[ghurd]

It looks more like an Ametek 99, which costs more than a standard Ametek.

G-

[Speo]

Hi ghurd,

What's a "standard" Ametek?

Thanks,

Speo

[Speo]

Tom,

Yes, it's beefier, but take a look at Indiana 48 (labeled 48V, 3 Amps at 840 RPM) compared to Indiana 24. The 48 is on the left and 24 on the right side.

Speo

[ghurd]

Standard is the 5", but they come in 7" and 9", often with more power output and a higher price tag.

G-

[finnsawyer]

You've fallen into the trap of thinking that there is one solution that fit's all.  One person might want a 4 or 5 foot diameter wind turbine at a remote cabin rather than an 8 foot diameter mill at his house with a corresponding drop in price.  With the larger mill a cut-in of 120 to 160 RPM makes sense while with the smaller mill 350 RPM might do.  Without the cost comparison your analysis is incomplete.  Since you are addressing some 10,000 users of this site why not provide the complete story?

[Speo]

Geo,

I agree, you are right, I took in cosideration only the "higher power generated at lower RPM" thing.

Out of the 10,000 users of this site, some will find it cheaper, some will find it more expensive at the stores they are visiting, or, on auction sites, this making them more or less happy to get it. It's one's homework to find it at the lowest price possible.

All I wanted was to bring to their attention this motor that not many people are aware of, so, they can start looking for it if they are interested.

Thanks,

Speo

[coldspot]

"Indiana 24 seems to be better than Ametek 30."

That would be only if the price was the same for each unit.

 My Ametek 30 cost me $20.00 USD!

 Thats pretty tuff to beat in price per power out.

my

$0.02

[Speo]

coldspot,

Indiana 24 beats your price per output big time in the range of 240-450 RPM.

At 450 RPM, Ametek 30 just starts to make some usable power.

Indiana 24 starts making usable power at 250 RPM, and it makes roughfly 180 Watts at 450 RPM.  

Until 450 RPM, Ametek 30 motors are expensive decorations.

"That would be only if the price was the same for each unit."

Is your Ametek 30 better in terms of output than Ametek 99 just because you got it for $20?

my

$0.02/watt