BALDOR DC Motors

Baldor DC Motors

Baldor•Reliance integral HP DC motors are based on more than 90 years of
Baldor•Reliance motor technology that includes the Super T and the original RPM motor –
the first DC motor specifically designed to operate from solid-state rectified power.

Suggested Applications Fractional DC – Conveyors | Extruders | Packaging Equipment | Mixers | Winders | Printing Presses | Metering Pumps

 Suggested Applications RPM III – Mill Drives | Tube Mills | Coating Lines | Winders | Printing Presses | Extruders | Mixers | Spindle Drives

Suggested Applications Round Frame Motors – Pulp + Paper Processing | Extruders | Conveyors | Test Stands | Stamping Press | Crane + Hoist | Machine Tools

UNIQUE LAMINATED SQUARE FRAME FOR BETTER PERFORMANCE

Better performance begins with RPM III motors’ unique laminated square frame. The
square configuration packs up to 20% more active material into the same space as a
round frame of equivalent shaft height.

This permits the Reliance motor to use a larger armature for optimum power generation, and also provides more ventilation area for better heat dissipation. You get more efficient space utilization without compromise in performance or motor life.

The RPM III frames are built from insulated steel laminations, which present an electrical barrier to the formation of eddy currents induced by the static power supply.

Compared to cast iron or rolled steel frames, the laminated frame greatly improves commutation for
optimum performance and significantly reduces heating for longer life. Frame rigidity and strength equivalent to solid rolled steel construction are assured by special assembly techniques to maintain minimum 200 psi interlaminate pressure.

ARMATURE AND FIELD WINDINGS DESIGNED AND TESTED TO INSURE
TROUBLE-FREE OPERATION

RPM III armatures are designed for superior commutation through the speed range to insure trouble-free operation. The commutator is a dimensionally stable, homogeneous unit that is easily serviceable. High or low bars are eliminated for better commutation.

Field coils are layer wound to eliminate air pockets which cause performance-limiting hot
spots. Field poles bolt securely to the frame to assure axial alignment and uniform air gap
between the poles and armature. This assures correct thermal and magnetic conduction
for optimum motor performance.

RPM III insulation systems provide an extra margin of safety for those tough industrial
applications with Class H materials and process techniques for optimum thermal, electrical
and mechanical strength.

EXCLUSIVE PLS®/POSITIVE LUBRICATION SYSTEM FOR LONGER LIFE

Longer life starts with the patented PLS/Positive Lubrication System. This system,
developed and tested by Baldor Electric engineers, provides positive motor bearing
protection in any mounting position or operating environment.

The grease directing passage (1) assures that incoming grease is uniformly distributed to
both sides of the bearing and to both inboard and outboard grease cavities. These cavities
(2&3) are generously sized to allow, in normal applications, one year operation before
re-greasing is necessary. Grease relief is provided through a drain (4) or along the outboard
shaft (5).

Open bearing design allows the lubricant to remove heat from the bearing; inner and outer
grease cavities protect the bearings from contamination; close internal clearances (6) and
inner anti-churning vanes (7) prevent grease leakage into the motor.
This exclusive lubrication system design results in excellent bearing protection and cooler
bearing operation, which contribute to long, trouble-free service regardless of motor
application.
RPM III laminated frame with integral lead outlet. Typical of frames GK112 through GK280.
RPM III wound frame with Class H insulating materials.
Inner and outer caps with PLS lubrication system features assure positive lubrication of RPM III motor bearings.

The following features and operating conditions apply to standard basic integral
horsepower motors in frames GK1104 through GK2810. Additional features
or more stringent operating conditions require a modification adder from the
Modification Section.

ENCLOSURES

The Standard Ratings section contains a listing of the following enclosures and
methods of cooling for motors cooled with customer supplied air:
IP23-IC17 (Separately Ventilated with Pipe-In Air)
IP44-IC37 (Separately Ventilated with Pipe-In Pipe-Out Air)
To obtain a motor with method of cooling IC06 (Force Ventilation with motor
mounted blower), add Mod. 130 – Blower without filter to the above basic motor.
Mod. 131 – Filter addition may be added for a motor operating in areas with
filterable contaminants.
The Standard Ratings section lists additional enclosures and methods of cooling
for motors operating in severe environments:
IP44-IC 410 (Totally Enclosed Non-Ventilated (TENV)

ALTITUDE

Sea Level to 1000 meters – Standard temperature rise is certified on the basis
that the motor will operate at an altitude from sea level to 1000 meters to a
maximum ambient of 40°C. IEC 34-1. Motors operating in higher altitudes must
have a modification added.

AMBIENT

Motors as listed are designed so that the temperature rise produced in the
motor, added to the standard 40° ambient temperature will not exceed the rated
temperature limit of the given insulation system.
Standard motors will provide rated output when operated in an ambient from
0° to 40°C. Operation below 0°C may require a motor with special brushes,
grease, shaft material and/or commutator construction.
Motors operating in higher ambient temperatures must have a modification
added from the Modification section.