This program computes electric motor performance characteristics for standard open drip-proof 1-250 horsepower (1800 RPM, T -frame) three-phase induction motors.

Program Notes:
The data tables contain specific values for nominal horsepower, full load amperage, and load power factor. This specific data is used to adjust the generalized performance curves.  The program may be tailored to a specific manufacturer simply by changing the data statements at the end of the program. The program is designed to run with nominal voltage ranges as specified below:

Nominal Minimum Maximum
Voltage Voltage Voltage
200/60/3170230
230/60/3 195.5 264.5
460/60/3391529

Downloads:
basic program (liberty basic) lbemp.bas

Test Case:

Compute the operating characteristics of a nominal 10 hp motor wound for 460 volts when applied to a 7.5 hp load on a 460 volt line.

ELECTRIC MOTOR PERFORMANCE


INPUT NOMINAL HP (1-250) =           10
INPUT NOMINAL VOLTS (200,230,460) =  460
INPUT LOAD HORSEPOWER =              7.5
INPUT LINE VOLTAGE =                 460


FULL LOAD HP =   10
FL AMPERAGE =    13.5
FL POWER FACTOR = 0.805
FL KILOWATTS =   8.65860859
FL EFFICIENCY =  0.8615703

RATED LOAD HP =  7.5
RL AMPERAGE =    10.9353798
RL POWER FACTOR = 0.74231692
RL KILOWATTS =   6.46757819
RL EFFICIENCY =  0.86508425

RERUN PROGRAM WITH NEW DATA (Y/N)? n