Multispeed motor issue.
Multispeed motor issue.
(OP)
Hello Guys ,
I have very strange case happen with me today . I hope someone can explain that to me cause I went to look for it and I didn’t find explanation.
I have multi speed AC motor 1800/900 rpm 25/15 HP. this is from the drawing , I ran this motor at high speed 1800 and the current was 11.6 A , I ran the motor at 900 rpm and the current was 23.8 A ?!!! does that make sense ???
anyone knows what exactly should happen for the current ?? do you guys think I have problem in the poles connection and I don’t have these right speed . one thing I am sure that when the motor was fast visually was less current and as what I mentioned before.
Thanks Folks.
Fernando
I have very strange case happen with me today . I hope someone can explain that to me cause I went to look for it and I didn’t find explanation.
I have multi speed AC motor 1800/900 rpm 25/15 HP. this is from the drawing , I ran this motor at high speed 1800 and the current was 11.6 A , I ran the motor at 900 rpm and the current was 23.8 A ?!!! does that make sense ???
anyone knows what exactly should happen for the current ?? do you guys think I have problem in the poles connection and I don’t have these right speed . one thing I am sure that when the motor was fast visually was less current and as what I mentioned before.
Thanks Folks.
Fernando





RE: Multispeed motor issue.
Thanks again .
RE: Multispeed motor issue.
Keith Cress
Flamin Systems, Inc.- http://www.flaminsystems.com
RE: Multispeed motor issue.
Fernando79, Were the currents read with the motor loaded or unloaded?
respectfully
RE: Multispeed motor issue.
Thanks
RE: Multispeed motor issue.
The motor may be just fine. Multispeed motors may exhibit higher no load current in low speed than high speed due to high magnetizing current required by the low speed connection.
RE: Multispeed motor issue.
23.8 amps at no-load ? That is more than the load current.
Fernando
Did you check the speed at lower speed ?
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