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Originally Posted by Richard
Fractional horsepower, intermittent-duty purpose built motors like the CIM (link is to the datasheet provided by the manufacturer) typically run at efficiencies around 65%. For example, the CIM's rated output at maximum efficiency is 154 Watts at 4614 RPM, and at this load it draws 19.8 Amperes from a 12V supply. So the electrical power input is 12 x 19.8 = 238 Watts and the efficiency is Pmech/Pelec = 154/238 = 65%. |
Except that Cirrus said that he has them running at 90+% efficiency, unless that is inaccurate, which it very well could be.
How exactly did you test efficiency, Cirrus? If you had them hooked up by connecting the leads on one motor to the leads on the other, spinning one, then counting revolutions on both motors, and comparing them; then I believe that that is an accurate representation of efficiency... But I would like to learn, so if anyone has an answer, I'd be more than happy to hear it
