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What happen when inlet airflow of an AC vacuum motor is blocked

Posted: Mon Apr 02, 2018 4:13 pm
by Qwe
What happen when inlet airflow of an AC vacuum motor is blocked? Based on quick test, fan case motor gets very hot, but why not motor winding? Hope to get some help here..

Re: What happen when inlet airflow of an AC vacuum motor is blocked

Posted: Tue Apr 03, 2018 7:37 am
by om_tech_support_AC
Hi Qwe,

What is the part number of the motor you are using? How are you measuring the temperature of the windings?

Re: What happen when inlet airflow of an AC vacuum motor is blocked

Posted: Tue Apr 03, 2018 6:37 pm
by Qwe
I test it using normal universal motor at 230vac. Thermocouples are used but only managed to place closed to the winding rotor. I found the fan case temperature shot up very fast and even higher than copper winding! Will this due to thermal radiation?

Re: What happen when inlet airflow of an AC vacuum motor is blocked

Posted: Thu Apr 05, 2018 11:46 am
by om_tech_support_AC
Since it is not an Oriental Motor product I cannot determine what factors are causing the fan to heat up faster then the winding. Also even if it was our product the AC induction motors we offer are not vacuum rated.