Background:
The locomotive traction motor has gradually shifted from DC motors to
AC motors in high-speed railways, and the traction motor needs to be regularly maintained and tested
frequently.
Objective:
The aim of this study was to test the related motor performance by obtaining and analyzing
motor data from the test according to the standard "Three-phase Asynchronous Motor Test
Method (GB-T 1032-2012)". The performance of the tested motor has been evaluated to meet the
relevant requirements of the application. Thus, reasonable and scientific references have been offered
for the maintenance and repair of the motor.
Methods:
A three-phase AC asynchronous motor test system based on LabVIEW and an AC power
dynamometer was constructed based on the needs of the factory and type test of a three-phase AC
asynchronous motor. Ambient temperature measurement, insulation resistance measurement, DC
resistance measurement, no-load characteristics test, overspeed test, blocking characteristics test,
load test, and temperature rise test have been carried out. The data on voltage, current, speed, power,
and so on, have been collected. A 125 kW three-phase asynchronous motor was tested with the designed
system, and the parameters obtained from the system were compared with those from the
motor labels.
Results:
The three-phase AC asynchronous motor test system was designed based on LabVIEW and
AC dynamometer operating on an industrial computer with a precision measuring instrument. The
most advanced virtual instrument technology was used to combine the powerful data computing and
processing ability with the measurement and control ability of instrument hardware. The software
proved to be able to acquire data display, control, storage, and analysis simultaneously. In addition,
a high degree of intelligence, an automatic motor start and stop control, automatic synchronous acquisition
of test data, automatic data processing and calculation, and automatic test report generation
and printing function were covered in this system. The simulated results of the system agreed well with
the actual performance of the three-phase asynchronous motor, and helped the motor to operate well.
Conclusion:
The designed testing system exhibited a high automation ability, reliability, and accuracy.
It proved to be a time and manpower-saving technical method, improving the actual test efficiency,
and helped to reduce labor intensity dramatically.