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[lutach]

Originally Posted by sleebus.jones

Yes, that's correct. Higher voltage will be more efficient.



Torque produced by a BL motor is a function of the can length. Once you saturate the magnetic field, they all make the same torque. So a 7700kv can make the same torque as a 4600kv, provided you can supply enough power to saturate the coil. Once it's saturated, all the power in the world won't change matters. If you want more torque, you need to go to a longer can.

This is further backed up by Castle's site:



and this:



So low kv does not equal more torque.

Castle Creations (With the Chinese slotless motors) is new to the brushless motor scene compared to Aveox (Neu included since Steve used to work at Aveox), Plettenberg, Lehner, Hacker, Mega and some other companies. Yes the can length has to do with torque mainly because of the length and/or diameter of the magnet. Take a lower turn Kv Nue motor and put it against a higher turn Kv motor and see which one has a higher Kt. I know first hand that my Neu 1515/2Y has more torque than my Neu 1515/1.5Y. I thought the .5 turn difference wasn't going to be noticed, but it is not by much though. Aveox has a nice way of calculating all of this, but I only have PDF files of it. I'll probably take a screen shot and post it here.

[sleebus.jones]

Originally Posted by lutach

Aveox has a nice way of calculating all of this, but I only have PDF files of it. I'll probably take a screen shot and post it here.

Cool, I'd like to check that out.

[lutach]

Originally Posted by sleebus.jones

Cool, I'd like to check that out.

I have attached the PDF file. The other one I have is bigger then what's allowed by RCM to upload. I can e-mail you the other PDF file and you'll find some interesthing data on page 5.

Please look at the 1406/4Y which has a Kv of 1500 and the 1415/1.5Y which has a Kv of 1568. You can see that the Torque Constant In OZ/AMP of the 1406/4Y is higher then the one from the much longer 1415/1.5Y.