No load current = FLA
No load current = FLA
(OP)
does hot rolled sheet stator lamination has something to do why no load current = full load current?
We are testing (no load) several 0.75 4Pole 220V induction motor and we are getting no load current = FLA rating.
The manufacturer told us that this was part of the design since they used hot rolled sheet for stator lamination instead of using cold rolled sheet.
Best Regards
JK
We are testing (no load) several 0.75 4Pole 220V induction motor and we are getting no load current = FLA rating.
The manufacturer told us that this was part of the design since they used hot rolled sheet for stator lamination instead of using cold rolled sheet.
Best Regards
JK





RE: No load current = FLA
RE: No load current = FLA
Pole number also has an influence and those little machines are guzzlers anyhow.
Gunnar Englund
www.gke.org
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100 % recycled posting: Electrons, ideas, finger-tips have been used over and over again...
RE: No load current = FLA
Thanks
RE: No load current = FLA
the motors were rated at 230V (+/-)5%. We measure the actual voltage around 220-222V. By the way, all motors i mentioned were 3phase, 220/380/440V 60hz induction motor.
The manufacturer are pushing that this were part of their hot rolled sheet stator lamination design.
does hot rolled sheet stator lamination has something to do why no load current = full load current?
Thanks,
JK
RE: No load current = FLA
Are these motors running very hot ?
Muthu
www.edison.co.in
RE: No load current = FLA
If hot rolled sheets have higher losses, then why would they use it? I already ask the manufacturer the same question, and still waiting for their reply.
RE: No load current = FLA
Muthu
www.edison.co.in
RE: No load current = FLA
Is this a special torque motor used to keep tension on a take-up reel?
Bill
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"Why not the best?"
Jimmy Carter
RE: No load current = FLA
There was a discussion on induction motors a few years ago. ht
There, the Ossanna diagram was mentioned. If your losses in the motor are high, the center of the diagram will be above the horizontal axis and the no-load vector shows that current is actually higher at no load than when load is applied. And then, for really 'bad' motors, is almost identical to FLA.
The explanation is that cos(phi) changes a lot when going from idling to loaded.
This is the reason why motor current isn't a good load indicator.
Gunnar Englund
www.gke.org
--------------------------------------
100 % recycled posting: Electrons, ideas, finger-tips have been used over and over again...
RE: No load current = FLA
I have seen motors with no-load= or > FLC but on load the current does not increase and in some cases load current comes down. The PF comes into play when the motor is loaded.
Muthu
www.edison.co.in
RE: No load current = FLA
Is there a run cap in the motor by chance?
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RE: No load current = FLA
i will post the result as soon as i get it.
by the way, the motor has no running capacitor. its a squirrel cage induction motor, 3Phase/220V/2.51Amp/0.67PF/1750RPM/60Hz/1.15SF