winding resistance test for 3 phased AC Dahlander motor
winding resistance test for 3 phased AC Dahlander motor
(OP)
Hi
Im not an electrical engineer but have somehow got involved in tests of ac motors.
Could someone tell me if there is a standard for the below measurements to compare motors e.g. from different suppliers.
And also what the purpose is - what can these measurements tell about the motor and how can it be used to compare motors.
Winding resistance is measured on the "cold" motor and the surface temperature is measured.
The motor is then run (in this case driving an impellor) for 1-2 hours until temperature is stabil.
The surface temperature is noted.
Then power is cut and stopwatch is started.
You wait for 10-20 seconds until the shaft has stopped moving completely.
The winding resistance is measured and the time of the measurement is noted
This is repeated with 5-10 sec. between measurements until you have 5-10 measurements.
The output of the tests is:
Delta temperature
Resistance at time 0 (the excat time of power cut)
Winding mean temperature
Best Regards
Buhl
Im not an electrical engineer but have somehow got involved in tests of ac motors.
Could someone tell me if there is a standard for the below measurements to compare motors e.g. from different suppliers.
And also what the purpose is - what can these measurements tell about the motor and how can it be used to compare motors.
Winding resistance is measured on the "cold" motor and the surface temperature is measured.
The motor is then run (in this case driving an impellor) for 1-2 hours until temperature is stabil.
The surface temperature is noted.
Then power is cut and stopwatch is started.
You wait for 10-20 seconds until the shaft has stopped moving completely.
The winding resistance is measured and the time of the measurement is noted
This is repeated with 5-10 sec. between measurements until you have 5-10 measurements.
The output of the tests is:
Delta temperature
Resistance at time 0 (the excat time of power cut)
Winding mean temperature
Best Regards
Buhl





RE: winding resistance test for 3 phased AC Dahlander motor
Also if you look for difference in high-precision resistance measurement among phases (just requires one set of 3 measurements, not the elaborate group of tests you mentioned), you might possibly find a motor problem.
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(2B)+(2B)' ?
RE: winding resistance test for 3 phased AC Dahlander motor
RE: winding resistance test for 3 phased AC Dahlander motor
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(2B)+(2B)' ?
RE: winding resistance test for 3 phased AC Dahlander motor
Otherwise i have to measure outside on the motor surface with a laser thermometer or maybe use thermal imaging.
You suggest to measure the 3 windings with high precision instrument and the values should be the same with some tolerance?