18
Specifications are subject to change without notice
Starting Switch
– single phase
motors use a field-proven rotating
mechanism for “three phase”
reliability, even in applications
requiring frequent starts.
Industrial Design Endshield
–
internal ribs for rigidity and cast
iron bearing inserts for accurate
alignment and quiet operation.
Industrial Design Endshield
– heavyweight, deep cross
section design endshields, with internal ribs for rigidity
and cast iron bearing inserts precision machined for
accurate alignment and quiet operation.
Data Plate
– “full fact” metal nameplate has
complete information including connection
data, amperage and full load efficiency.
Connection Box
–
generously sized,
gasketed conduit box
with several access
holes and ground
screw for easy quick
connections to
permanently marked
leads.
LEESON…Industrial Quality From the Inside Out
Cooling System
– quiet, efficient cooling with
high volume, chemically inert, static-free fan.
Heavy steel fan cover channels air for maximum
cooling. Fan positively positioned by oppos-
ing flats and snap ring/shoulder for trouble-free
operation even in frequent starting applications.
Stationary Switch
– heavy-duty
silver-cadmium oxide contacts and
wear pads (single phase only).
Capacitor
– molded-case starting
capacitor in single phase motors assures
high starting torques, adequate for the
most demanding loads.
Winding
– high temperature, moisture-re-
sistant (MR200° magnet wire) copper wind-
ing tied each end, preheated, immersed
in Class H polyester varnish and cured,
resulting in a stator with vibration and
environmental resistance, built-in overload
capacity and high full-load, verified effi-
ciencies for energy savings.
Motor Base & Frame
– a heavy-
gauge base is electrically welded
in multiple locations to a seam-
welded steel frame for maximum
rigidity and mounting strength.
Overload Protection
– thermal overload protectors allow
the motor to work at its fullest while providing protection
against stall conditions and excessive overload.
Rotor/Shaft Assembly
– high pressure cast,
void-free rotor is heat shrunk to a precision
machined shaft, dynamically balanced for quiet
vibration-free operation. Electric motor grade
ball bearings used each end. Shell Dolium R
lubricant. Internal fan eliminates “hot spots”.
LEESON’s Inverter Rated Insulation
System (IRIS
™
) provides superior
motor protection against voltage spikes
induced by variable frequency drives.
This total insulation system protects
better than spike-resistant magnet wire
alone. Specially formed phase insulation,
cushioned and sleeved connections
(from the leads all the way into the turns),
and deep-penetrating, non-hygroscopic,
high temperature varnish are just a few
features contributing to the extra protec-
tion. The IRIS
™
total insulation system
is standard at no extra cost in all
LEESON stock three-phase motors, 1
HP and larger.
