This article describes the relationship between the different motor constants (e.g. speed and torque constant).
Generally, motor constants result from the construction details of a given motor. Such as
 active length and diameter
 winding geometry, winding resistance and winding number
 magnetic flux densities, permanent magnets
Torque constant k_{M}
 relates the produced torque to the motor current
 maxon unit: mNm / A
 SI unit: Nm / A
Speed constant k_{n}
 relates the motor speed to the back EMF voltage
 maxon unit: rpm / V
 SI unit: rad/s / V
Relationship between k_{n} and k_{M}
 k_{n} is basically the inverse of k_{M}
 in maxon units
 in SI units
Generator constant k_{G}
 relates the generated back EMF voltage to the motor speed
 the inverse of the speed constant: k_{G} = 1/ k_{n}
 unit: V / rpm
 often also in V / 1000rpm
Motor constant k
 used to express the strength of the motortype (size)
 independent of the winding details, such as resistance R
 relation:
with:

 M = torque
 P_{J} = Joule power loss (= R * I^{2})
 The maxon speedtorquegradient is proportional to 1 / k^{2}.
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