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https://www.diygokarts.com/community/th … uide.9700/
Electric motors in karts: a simple guide
The most important variable in these equations is the motor constant, k. The motor constant is made up of a combination of stator size, windings, and magnetic field. I had to keep these in mind when choosing the components for my motor to make sure it would perform well. Torque (τ) and rotational velocity (ω) of a motor are both related to k.
k=NBLD
ω=2*V/k
τ=2*k*i
N is the number of turns of wire on each tooth of the stator, B is the remnant flux from the magnets, L is the length or thickness of the stator, and D is the diameter of the stator. k is also related to speed and torque, where V is the voltage and i is the current through the windings.
http://krex.k-state.edu/dspace/bitstrea … ey2009.pdf
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