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Re: how deep do the coilers prefer doing it? : )



Original poster: Jim Lux <jimlux@xxxxxxxxxxxxx>

At 11:03 AM 3/2/2006, Tesla list wrote:
Original poster: "Dmitry (father dest)" <dest@xxxxxxxxxxx>


p.s.

> Original poster: FIFTYGUY@xxxxxxx

>      Simple method to measure motor torque? Mechanically couple the
> test motor to a generator.

>      Or as I prefer, use a motor and a digital drive.

>      I think to do it strictly mechanically, it might be a lot easier
> and practical to use a pulley as a winch to lift a weight.


Use a Prony brake and a spring scale. Take a piece of wood (or metal) and fabricate a sort of clamp that clamps around the shaft or a suitable pulley (think in terms of a wooden clothespin).. it's hard to describe in words. You put the spring scale on the clamp, and start with it loose. Fire up the motor, tighten the clamp gradually until the speed is at the point you want to measure the torque. take the force on the spring scale, multiply by length of lever arm, you're done.



This can get a bit exciting if you're measuring something like a 10 HP motor, since all the energy is going into the brake, and you've got to get the heat out. I've seen one that used a modified disk brake from a motorcycle. It was very clever: they rigged the caliper on a bracket that had a spring scale (actually a bathroom electronic scale with the load cell) and had a C-clamp to squeeze the handle on the brake lever. Since the lever arm on the caliper was exactly a foot long, it read directly in ftlb.

i`m cutting my motor every weekend (only), so i have to ask it today % )
ok - i can`t get quantitative data on actual torque, but why just not
imply indirect method of measurement?
say, i can connect a wattmeter to the motor, brake the rotor until it
lost sync and register power consumption at that moment. then cut
rotor a bit and repeat this procedure - if idle power hadn`t increased
noticeable, but power when sync is lost does - i`m going in right way?

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Let the bass kick! =:-D