G
LOSSARY
BDS5
Glossary-vi
Encoder Marker
A ounce-per-revolution signal provided by some
incremental encoders to specify a reference point
within that revolution. Also known as Zero
Reference signal or index pulse.
Encoder Resolution
A measure of the smallest positional change which
can be detected by the encoder.
Explosion-proof
A motor classification that indicates a motor is
capable of withstanding internal explosions without
bursting or allowing ignition to reach beyond the
confines of the motor frame.
Fall Time
The time for the amplitude of system response to
decay to 37% of its steady-state value after the
removal of a steady-state step input signal.
Feed Forward
A technique used to pre-compensate control a loop
for known errors due to motor, drive, or lead
characteristics. Provides improved response.
Feedback
A signal which is transferred from the output back to
the input for use in a closed loop system.
Field Weakening
A method of increasing the speed of a wound field
DC motor; reducing stator magnetic field instantly by
reducing magnet winding current.
Filter (Control Systems)
A transfer function used to modify the frequency or
time response of a control system.
Flutter
Flutter is an error of the basic cycle of an encoder per
one revolution.
Following Error
The positional error during motion resulting from use
of a position control loop with proportional gain only.
Form Factor
The ratio of RMS current to average current. This
number is a measure of the current ripple in a PWM
or other switch mode type of controller. Since motor
heating is a function of RMS current while motor
torque is a function of average current, a form factor
greater than 1.00 means some fraction of motor
current is producing heat but not torque.
Four Quadrant
Refers to a motion system which can operate in all
four quadrants i.e. velocity in either direction and
torque in either direction. This means that the motor
can accelerate, run, and decelerate in either direction.
Friction
A resistance to motion caused by surfaces rubbing
together. Friction can be constant with varying speed
(coulomb friction) or proportional to speed (viscous
friction) or present at rest (static friction).
Full Load Current
The armature current of a motor operated at its full
load torque and speed with rated voltage applied.
Full Load Speed
The speed of a motor operated with rated voltage and
full load torque.
Gain
The ratio of system output signal to system input
signal.
Hall Sensors
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