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Motor Nomenclature

Td oz-in (N-m) Torque (rotating moment) expressed in oz-in or Newton meters (Nm)
Tp oz-in (N-m) Peak instantaneous torque expressed in oz-in or Newton-meters (Nm)
Tl oz-in (N-m) Load torque expressed in oz-in or Newton-meters (Nm)
Rm Ohms Phase to phase resistance of the motor windings
Tf oz-in (N-m) Motor friction torque
Jm oz-in-sec2
(Kg-m-s2)
Motor inertia
Jl oz-in-sec2
(Kg-m-s2)
Reflected load inertia
Kv Volts/KRPM
Volts/(rad/sec)
Motor Back EMF constant
w RPM
(radians/sec)
Motor angular velocity
a rad/sec2 Shaft angular acceleration
Km (oz-in)sqrt(watts) Motor constant ( This is a figure of merit of e motor which describes its ability to convert power input to torque output.)
Kd oz-in/krpm
N-m/rad/sec
Motor constant ( This is a figure of merit of e motor which describes its ability to convert power input to torque output.)
Kt oz-in/amp
N-m/amp
Torque sensitivity. It is the measure of the motor's ability to convert input current to rotating moment(torque)
Ip amps Peak current at stall
Pp watts Power input with shaft stalled at Tp