BDS5
G
LOSSARY
Glossary-xi
Power
The rate at which work is done. In motion control,
Power = Torque x Speed.
Process Control
A term used to describe the control of machine or
manufacturing processes, especially in continuous
production environments.
Pull-In Torque
The maximum torque at which an energized stepping
motor or synchronous motor will start and run in
synchronism.
Pull-Out Torque
The maximum torque that can be applied to a
stepping motor or synchronous motor running at
constant speed without causing a loss of synchronism.
Pulse Rate
The frequency of the step pulses applied to a stepper
motor driver. The pulse rate divided by the
resolution of the motor/drive combination (in steps
per revolution) yields the rotational speed in
revolutions per second.
PWM
Pulse Width Modulation. An acronym which
describes a switch-mode control technique used in
amplifiers and drivers to control motor voltage and
current. This control technique is used in contrast to
linear control and offers the advantages of greatly
improved efficiency.
Quadrature
Refers to signal characteristics of interfaces to
positioning devices such as encoders or resolvers.
Specifically, that property of position
Ramping
The acceleration and deceleration of a motor. May
also refer to the change in frequency of the applied
step pulse train.
Rated Torque
The torque producing capacity of a motor at a given
speed. This is the maximum continuous torque the
motor can deliver to a load and is usually specified
with a torque/speed curve.
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 the positioning accuracy for a
given move performed repetitively can be duplicated.
Resolution
The smallest positioning increment that can be
achieved. Frequently defined as the number of steps
or feedback units required for a motor's shaft to rotate
one complete revolution.
Resolver
A position transducer utilizing magnetic coupling to
measure absolute shaft position over one revolution.
Resonance
The effect of a periodic driving force that causes
large amplitude increases at a particular frequency.
(Resonance frequency.)
RFI
Radio Frequency Interference.
Ringing
Oscillation of a system following sudden change in
state.
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