Dc Motors Aplications

Small DC Motors - Application GENERAL
TYPE DESIGNATION
Small DC designs are identified with the various electrical designs:
Type Electrical Design T Rotating and straight DC TR Rectified power TP Type Electrical Design Permanent magnet, straight DC TPP Permanent magnet, rectified power

MAXIMUM VOLTAGE - is 250 volts with standard insulation. For
higher voltages, integral frame sizes arerecommended. Minimum voltage is 75 volts in standard construction. 12 volt and up are available with HP derated as limited by brush current density.

V*S Master Motor

FORM FACTOR - of the current is the ratio of the root-mean-square
value of the current to the average value of current. For straight DC, the form factor is 1. For motors operated on rectified power, the AC ripple content of therectified current will cause additional heating, which increases as the square of the form factor. A motor is suitable for operation at the form factor stamped on the nameplate or lower at rated load and rated speed. Actual motor heating when run in the application with the intended power supply should be determined by test and is the responsibility of the purchaser.

APPLICATION

Small DC motors aredesigned for use in industrial and commercial applications such as the following typical industries: 1. Business machines 2. Material Handling -- conveyors 3. Pumps and blowers 4. Machine tools 5. Systems and gear drives 6. Elevator door operators 7. Adjustable speed drives 8. Agitators and mixers

RPM AC Motors 1/3 - 5 HP

SERVICE FACTOR WINDINGS

APPROVALS, LISTINGS

All motors aredesigned for the service factor 1.0.

48 and 56 frame DC motors are Underwriter (UL) listed and Canadian Standards Assoc. (CSA) approved. Additionally, hazardous (XP) motors carry (UL) hazardous listings for the class and group specified.

The shunt motor is the standard price book listed motor. The compound motor is designed with the series field not to exceed 15% of the total excitation. The designis capable of series windings up to 50% of the total excitation for special applications.

ELECTRICAL DATA
RATING TABLE FOR DRIVES WITHOUT A BACK DIODE
Constant Torque Speed Range 20:01 15:01 10:01 5:01 1:01 % HP Adjustment 60 74 86 94 100

Compensated shunt, series and split series motors are available on a special basis.
RPM AC Motors 2 - 1,000 HP

TORQUE CHARACTERISTICS

Example: Tomaintain 20:1 speed range for a.50 HP motor, multiply .50 x .60, for the HP. 2 HP motor requires derating to 90% of above at 50% speed and below.

Type T motors are designed for the following typical torque characteristics: (defined as torque available under stable operating conditions.)
Stalled Torque Compound Shunt Series Permanent Magnet 400% 250% 750% 600% Breakdown Torque 350% 250% -PWM TYPE DRIVES VOLTAGE RATINGS

Please contact Product Marketing for information.

FIELD-PERMANENT MAGNET
Large AC Motors

The following voltages are considered standard with Reliance Electric.
Arm. Volts Rotating DC Rectified Power Full Wave 115 230 90 180 Field Volts 115 230 50, 100 100, 200

BARRIUM FERRITE - ceramic magnets with high coercive forces will
permit long life operationunder the rated operating conditions.

Small, Medium & Large DC Motors

Discount Symbol: RM031 M-243

Small DC Motors - Application
V*S Master Motors

ELECTRICAL DATA (cont.)
ENCLOSURES
SXT motors are specially constructed to withstand the corrosive atmospheres of chemical plants, oil refineries, paper mills and other corrosive environments. Typical applications include pumps, mixers,blowers, fans or motors used in salt laden, wet or humid locations.

BRUSH ACCESS

Brush access is not available on explosion-proof motors. All other 56 frames have brush access from outside the frame.

SHAFTS

SXT FEATURES
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RPM AC Motors 2 - 1,000 HP

Base - Standard Welded Bearings - Double Sealed Cast Iron Conduit Box - Field Mounting Kit...