Selecting a Replacement Motor

Nameplate Data:
Nameplate data is the most important first step
in determining motor replacement. Much of the
information needed can be generally obtained
from the nameplate of the motor to be replaced.
Take time to record nameplate information
because it can save time, avoid confusion and
misapplication.
Important Nameplate Data includes:
Catalog Number – In many cases, for stock motors,
there are cross-reference charts created by motor
manufactures to cross their competitor’s motors
to their catalog numbers.
Frame – Motor manufacturers follow NEMA
Frame size dimensions so that motors, having
the same NEMA frame size are “Drop-in”
replacements.
Type: (classification varies from manufacturer to
manufacturer.)
Phase: Three basic types - single-phase, three-
phase or DC (Direct current).
HP: horsepower rated at full load speed.
HZ: Frequency in cycles per second. Usually 60
Hz in USA, 50 Hz overseas.
RPM: Revolutions per minute of the shaft at
Full load speed. Approximate motor speeds
would be: 3450, 1750, 1125, and 850RPM.
Voltage: Incoming voltage rating of motor,
such as 115volts, 230 volts, 460 volts, etc…
Amperage (F.L.A): Full load motor current.
Maximum ambient operating temperature in
centigrade: usually +40° C (104° F).
Duty: Most motors are rated continuous.
Some applications however may use motors
designed for intermittent, special, 15, 30 or 60
minute duty.
Code: Indicated locked rotor kVA per horse-
power. (Electricians use this information to
properly size what wire they need to use and
what size breaker is needed)
ENCL (Enclosure Type): Describes motor en-
closure. TEFC = Totally enclosed fan cooled,
TENV = Totally enclosed non-vent, ODP =
Open drip-proof, TEAO = Totally enclosed air
over. DP = Drip-Proof.
Other important nameplate information
includes: Motor service factor, Insulation class
and Design (NEMA Design)
Other important non-nameplate information
would include: Mounting Type – verify how
motor is mounted - base mount (rigid or
resilient type) take measurements from old
motor. Face mount – describe bolt-hole size
and bolt circle and hub dimensions. If extended
bolts used to mount motor, verify length and
thread-size. Describe shaft size, length and
keyway size or flat length and depth and if
shaft has any tapped holes.
Verify motor shaft rotation. CW, CCW, or REV.
Application Information:
Single-Phase General Purpose Motors
ODP Models: For use where
water and dust exposure is
moderate. They are ideally
suited for use on pumps,
compressors, blowers, fans,
and other direct or belt-
driven applications.
TEFC Models: For use where
exposure to water, dust and corrosives exists.
Typical applications include pumps, compressors,
blowers, fans, conveyors, machine tools and
other direct or belt-driven applications.
Single-Phase Farm Duty Motors
Our line of single-phase Farm
Duty / Agricultural Duty Series
of motors are designed and
built for the tough
applications found in the
agricultural industry.
Mechanical Features include:
Gasketed capacitor housing and conduit boxes
provide protection in all environments. Double
sealed ball bearings are pre-lubricated with
Exxon POLYREX® EM grease having operating
temperature range of -20°F to+350°F. Rubber
boot over manual protector reset button
provides weather protection.
Applications include: Feeders, conveyors, fans,
compressors, spray washers, grinders, elevators,
pumps and other demanding applications that
require high starting torque.
Compressor Duty Motors
Motors designed for compressor duty applications,
which require high break-
down torque and rugged
mechanical construction.
Motors are re-connectable
for both CW and CCW
rotation and have a manual
reset button for motor overload protection.