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Moog Animatics SmartMotor™ Developer's Guide, Rev. L
Page 869 of 909
Horsepower
A unit of measure of power. One horsepower is equal to 746 watts. The measurement of
rotary power must take speed and torque into account. Horsepower is a measure of a motor’s
torque and speed capability. The formula is:
HP = Torque (lb-in.) x Speed (RPM)/63,025
HP = Torque (lb-ft.) x Speed (RPM)/5,252
HP = Volts x Amps x Efficiency/746
Inductance (L) (mH - millihenries line-to-line)
The property of a circuit that has a tendency to resist current flow when no current is flowing,
and when current is flowing has a tendency to maintain that current flow. It is the electrical
equivalent to mechanical inertia.
Inductance (mutual)
Mutual inductance is the property that exists between two current-carrying conductors (or
coils) when a change in current in one induces a voltage in the other.
Inertia
The property of an object to resist change in velocity unless acted on by an outside force.
Higher-inertia objects require larger torques to accelerate and decelerate. Inertia is
dependent on the mass and shape of the object.
Inertial Match
The reflected inertia of the load is equal to the rotor inertia of the motor. For most efficient
operation, a system coupling ratio should be selected that provides this condition.
Master (/ Slave)
The device that is controlling the downstream device(s), or slave(s). For example, it could be
a PLC controlling one or more SmartMotors and other devices (e.g., via fieldbus
communications), a SmartMotor controlling other SmartMotors (e.g., Combitronic
communications). Master, in follow mode or cam mode, refers to the encoder source input.
Open-loop
A system in which there is no feedback. Motor motion is expected to faithfully follow the input
command. Stepping motor systems are an example of open-loop control.
Overload Capacity
The ability of a drive to withstand currents above its continuous rating. It is defined by NEMA
(National Electrical Manufacturers Association) as 150% of the rated full-load current for
"standard industrial DC motors" for one minute.
Peak torque (Tpk) (lb-in.)
The maximum torque a brushless motor can deliver for short periods of time. Operating
permanent-magnet motors above the maximum torque value can cause demagnetization of
Appendix: Glossary
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