Rockwell Automation FlexPak 3000 Digital DC Drive Version 4.3 - Manual (Page 183)

Glossary-1
G
LOSSARY
altitude - The atmospheric altitude (height above sea level) at which the motor or
drive will be operating.
armature -The portion of the DC motor that rotates.
armature resistance - Measured in ohms at 25 degrees Celsius (cold).
base speed - T. he speed that a DC motor develops at rated armature voltage and
rated field current with rated load applied. Typically nameplate data.
configurable - Input parameter whose values can only be modified while the drive is
stopped (not running or jogging).
constant speed - Used to describe a motor that changes speed only slightly from a
no-load to a full-load condition.
DC motor - A motor using either generated or rectified DC power. A DC motor is
usually used when variable speed operation is required.
DB - Dynamic Braking.
default value - Parameter values that are stored in the drive’s read-only memory
(ROM).
drive - Power converting equipment supplying electrical power to a motor.
efficiency - The ratio of mechanical output to electrical input. It represents the
effectiveness with which the motor converts electrical energy to mechanical energy.
field - A term commonly used to describe the stationary (stator) member of a
DC motor. The field provides the magnetic field with which the mechanically rotating
(armature or rotor) member interacts.
horsepower - The measure of the rate of work. One horsepower is equivalent to lifting
33,000 pounds to a height of one foot in one minute. The horsepower of a motor is
expressed as a function of torque and
RPM . For motors, you can approximate
horsepower using this formula:
where:
• HP = horsepower
• T = Torque (in lb-ft)
• RPM = revolutions per minute
HP T
RPM
5250
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