BDS5
G
LOSSARY
Glossary-ix
The time for an unloaded motor to reach 63.2% of its
final velocity after the application of a DC armature
voltage.
Microstepping
An electronic control technique that proportions the
current in a step motor's windings to provide
additional intermediate positions between poles.
Produces smooth rotation over a wide speed range
and high positional resolution.
Mid-Range Instability
A phenomenon in which a stepping motor can fall out
of synchronism due to loss of torque at mid-range
speeds. The loss of torque is due to interaction
between the motor's electrical characteristics and the
driver electronics. Some drivers have circuitry to
eliminate or reduce this phenomenon.
Most Significant Bit
The bit in a binary number that is the most important
or that has the most weight.
Motor, AC
A device that converts electrical alternating current
into mechanical energy. Requires no commutation
devices such as brushes. Normally operated off
commercial AC power. Can be single- or multiple-
phase.
Motor, AC Asynchronous or Induction
An AC motor in which speed is proportional to the
frequency of the applied AC. Requires no magnets or
field coil. Usually used for non-precise constant
speed applications.
Motor, AC Synchronous
Another term for brushless DC motor.
Motor Constant
The ratio of the motor torque to motor input power.
Motor, DC
A device that converts electrical direct current into
mechanical energy. It requires a commutating device,
either brushes or electronic. Usually requires a
source of DC power.
Motor, DC Brushless
A type of direct current motor that utilizes electronic
commutation rather than brushes to transfer current.
Motor, DC Permanent Magnet
A motor utilizing permanent magnets to produce a
magnetic field. Has linear torque speed
characteristics.
Motor, DC Wound Field
A direct current utilizing a coil to produce a magnetic
field. Usually used in high power applications where
constant horsepower operation is desired.
Motor, Stepping
A specialized AC motor that allows discrete
positioning without feedback. Normally used for
non-critical, low power applications, since positional
information is easily lost if acceleration or velocity
limits are exceeded. Load variations can also cause
loss of position. If encoders are used, these
limitations can be overcome.
NC, Numerical Control
Usually refers to any type of automated equipment or
process used for contouring or positioning.
Negative Feedback
The type of feedbacks used in a closed loop system
where the output value is inverted and combined with
the input to be used to stabilize or improve system
characteristics.
No Load Speed
Motor speed with no external load.
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