Kollmorgen BDS5, Installation And Setup Manual, Page: 136 / 150

BDS5 G
LOSSARY
Glossary-v
A motor drive in which the output is directly
proportional to either a voltage or current input.
Normally both inputs and outputs are analog signals.
This is a relatively inefficient drive type.
Drive, PWM
A motor drive utilizing Pulse-Width Modulation
techniques to control power to the motor. Typically a
high efficiency drive that can be used for high
response application.
Drive, SCR
A DC motor drive which utilizes internal silicon
controlled rectifiers as the power control elements.
Usually used for low bandwidths, high power
applications.
Drive, Servo
A motor drive which utilizes internal feedback loops
for accurate control of motor current and/or velocity.
Drive, Stepper
Electronics which convert step and direction inputs to
high power currents and voltages to drive a stepping
motor. The stepping motor driver is analogous to the
servo motor amplifier.
Duty Cycle
For a repetitive cycle, the ratio of an on time to total
cycle time.
( )
( )
Duty Cycle =
On Time
On Time + Off Time
×
100%
Dynamic Braking
A passive technique for stopping a permanent magnet
brush or brushless motor. The motor windings are
shorted together through a resistor which results in
motor braking with an exponential decrease in speed.
Efficiency
The ratio of power output to power input.
Electrical Time Constant
The ratio of armature inductance to armature
resistance.
Electronic Gearing
A technique used to electrically simulate mechanical
gearing. Causes one closed loop axis to be slaved to
another open or closed loop axis with a variable ratio.
EMI: Electro-Magnetic Interference
EMI is noise which, when coupled into sensitive
electronic circuits, may cause problems.
Encoder
A type of feedback device which converts mechanical
motion into electrical signals to indicate actuator
position. Typical encoders are designed with a
printed disc and a light source. As the disc turns with
the actuator shaft, the light source shines through the
printed pattern onto a sensor. The light transmission
is interrupted by the patterns on the disc. These
interruptions are sensed and converted to electrical
pulses. By counting these pulses, actuator shaft
position is determined.
Encoder, Absolute
A digital position transducer in which the output is
representative of the absolute position of the input
shaft within one (or more) revolutions. Output is
usually a parallel digital word.
Encoder, Incremental
A position encoding device in which the output
represents incremental changes in position.
Encoder, Linear
A digital position transducer which directly measures
linear position.