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Moog Animatics SmartMotor™ Developer's Guide, Rev. L
Page 870 of 909
the rare-earth magnets. This is an irreversible effect that will alter the motor characteristics
and degrade performance. It is also known as peak current. This should not be confused with
system peak torque, which is often determined by amplifier peak-current limitations, where
peak current is typically two times continuous current.
Poles
Refers to the number of magnetic poles arranged on the rotor of the brushless motor. Unlike
an AC motor, the number of poles has no direct relationship to the base speed of the motor.
Power
The rate at which work is done. In motion control, power is equal to torque multiplied by
speed.
Power (watts) = force x distance/time
Power = voltage x current
Power Factor
Ratio of true power (kW) to apparent power (kVA).
Pulse Rate
The frequency of the step pulses applied to a step motor driver. The pulse rate, multiplied by
the resolution of the motor/driver combination (in steps per revolution), yields the rotational
speed in revolutions per second.
Pulse Width Modulation (PWM)
Describes a switch-mode (as opposed to linear) control technique used in amplifiers and
drivers to control motor voltage and current.
Ramp, Ramp Up, Ramp Down
The whole or ascend/descend parts, respectively, of the Trapezoidal Move Profile (TMP),
which is associated with follow or cam modes. The complete motion profile is defined by an
ascend (ramp up) part, the slew part, and the descend (ramp down) part. See the diagram
Trapezoidal Move Profile (TMP) and Output Position Diagrams on page 141.
Read / Read-Write
Read (or read-only): the system can read data from a file or device but not write data to the
file or device.
Read-Write: the system can read data from or write data to a file or device.
Regeneration
The action during motor braking, in which the motor acts as a generator and takes kinetic
energy from the load, converts it to electrical energy and returns it to the amplifier.
Repeatability
The degree to which a parameter such as position or velocity can be duplicated.
Appendix: Glossary
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