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Moog Animatics SmartMotor™ Developer's Guide, Rev. L
Page 867 of 909
Cogging (Cogging Torque)
A term used to describe nonuniform angular velocity. Cogging appears as jerkiness,
especially at low speeds.
Commutation
A term which refers to the action of steering currents or voltages to the proper motor phases
so as to produce optimum motor torque. Proper commutation means the relationship of the
Rotor to the Stator must be known at all times.
l
In brush-type motors, commutation is done electromechanically through the brushes
and commutator.
l
In brushless motors, commutation is done by the switching electronics using rotor
position information obtained by Hall sensors, single turn absolute encoder or a
resolver.
Controller
A term describing a functional block containing an amplifier, power supplies and possibly
position-control electronics for operating a servomotor or step motor.
Current at Peak Torque (IPK) (Amperes)
The amount of input current required to develop peak torque. This is often outside the linear
torque/current relationship.
Current, Rated
The maximum allowable continuous current a motor can handle without exceeding motor
temperature limits.
Detent Torque
The maximum torque that can be applied to an unenergized step motor without causing
continuous rotating motion.
Duty Cycle
For a repetitive cycle, the ratio of on time to total cycle time.
Duty cycle (%) = [On time / (On time + Off time)] x 100%
Dynamic Braking
A passive technique for stopping a permanent magnet brush or brushless motor. The motor
windings are shorted together through a resistor which results in motor braking with an
exponential decrease in speed.
Efficiency
The ratio of power output to power input.
Appendix: Glossary
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