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Motor Characterization for Small Running Robots (2016)
Torque Constant: 0.3081 N*m/AResistance: 11.7 ΩMotor Constant: 0.0901 N*m/sqrt(watt)Turnigy Multistar Elite 5010LinkPrice: $52.69 $42.15 as of 1/29This is a beautiful motor. You pay for it, but Hobbyking really outdid themselves here. For an extra $15 over other motors of similar size, you get absolutely beautiful single-strand, perfect windings, curved N45SH magnets, and an overall just really nice feeling motor.
Drill-o-metered back EMF. This is nominally a 274 RPM/Volt Motor. Fairly sinusoidal looking.
Torque Constant: 0.0333 N*m/AResistance: 128 mΩMotor Constant: 0.0930 N*m/sqrt(watt)Gartt ML 5208LinkPrice: $38-$45I had high hopes for this motor. I managed to offer them down to $38 on ebay, making it cheaper than most equivalently sized motors from Hobbyking. Unlike the two motors above, it has 22 rather than 14 poles. A nice thing about having more pole pairs is that there's less flux between poles (because each pole is smaller area). I was hoping this would mean that the rotor can would be less leaky (i.e. less flux leaking out of it). This indeed appears to be the case - you can barely feel metal objects stick to the can of the motor.
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