Rockwell Automation FlexPak 3000 DC Drive Version 4.3 - Manual (Page 97)

Glossary Of Terms D-3
service factor (SF): When used on a motor nameplate, a number which indicates
how much above the nameplate rating a motor can be loaded without causing serious
degradation, (i.e., a 1.15 SF can produce 15% greater torque than a 1.0 SF rating of
the same motor).
tachometer: Normally used as a rotational sensing device. Tachometers are typically
attached to the output shaft of a motor requiring close speed regulation. The
tachometer feeds its signal to a control loop which adjusts its input to the motor
accordingly.
top speed: The highest speed a drive can achieve. Top speed equals base speed
when there is no field weakening.
torque: Turning force delivered by a motor or gearmotor shaft, usually expressed in
pounds-feet or newton-meters:
lbs.ft. = HP x 5250 / RPM = full load torque
Nm = P(kW) x 9550/RPM = full load torque