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| D | E | F
| G | H | I
| J | K | L
| M | N | O
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| T | U | V
| W |
"D"FLANGE
A special end shield with holes for through bolts in the flange and is
primarily used for mounting the motor on gear boxes or bulkheads. Standardized
for frames 143T through 445T. "D" flanges are not threaded and
the bolt holes extend beyond the motor frame.
D.C. (DIRECT CURRENT)
A current that flows only in one direction in an electric circuit. It
may be continuous or discontinuous and it may be constant or varying.
DC MOTOR
A motor using either generated or rectified D.C. power (see Motor
definition) . A DC motor is usually used when variable speed operation
is required.
DEFINITE PURPOSE MOTOR
A definite purpose motor is any motor design, listed and offered in standard
ratings with standard operating characteristics with special mechanical
features for use under service conditions other than usual or for use
on a particular type of application. (NEMA)
DESIGN A, B, C, D - for AC MOTORS
NEMA has standard NEMA motor designs of various torque characteristics
to meet the various requirements posed by different application loads.
The design "B" is the most common design. (See chart for characteristics
of each design.)
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