292 RPM induction motor on test stand
292 RPM induction motor on test stand
(OP)
Guys & Gals,
We have a 2000 HP, 292 RPM (24-pole induction), 4160V, 60Hz circulator motor on a test stand. It's an Allis Chalmers motor and is probably 30-40 years old.
I am trying to figure out some ballpark numbers for the no-load current and the rotor moment of inertia. Do any of you have access to motor data sheets of induction motors of similar speed and horsepower? Any help would be appreciated.
Another option would be to pay Siemens $1500 for engineering data, but I only need ballpark figures. For example, will the no-load current be about 25%, or 35%, or 45%, etc. of full load current?
We have a 2000 HP, 292 RPM (24-pole induction), 4160V, 60Hz circulator motor on a test stand. It's an Allis Chalmers motor and is probably 30-40 years old.
I am trying to figure out some ballpark numbers for the no-load current and the rotor moment of inertia. Do any of you have access to motor data sheets of induction motors of similar speed and horsepower? Any help would be appreciated.
Another option would be to pay Siemens $1500 for engineering data, but I only need ballpark figures. For example, will the no-load current be about 25%, or 35%, or 45%, etc. of full load current?





RE: 292 RPM induction motor on test stand
Muthu
www.edison.co.in
RE: 292 RPM induction motor on test stand
The WK^2 of the motor is 110,052 lbm-ft^2.
Data sheet doesn't have no-load currrent, but I think I can find it in a refurbishment report somewhere.
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(2B)+(2B)' ?
RE: 292 RPM induction motor on test stand
RE: 292 RPM induction motor on test stand
You should be able to adjust the field current to a level somwhere below rated where the power factor becomes close to 1 and the current reaches a very low minimum which is basically just to supply the losses of the motor.
RE: 292 RPM induction motor on test stand
Muthu
www.edison.co.in
RE: 292 RPM induction motor on test stand
RE: 292 RPM induction motor on test stand
Not sure why you want to know the no-load current but I'd assume it's to assure yourself that the motor health is OK. A much better measurement than the no-load current is to use the motor no-load power draw. You can make some assumptions from what you'd expect the motor efficiency is to assure yourself the no-load power draw is within an acceptable range.
RE: 292 RPM induction motor on test stand
Do you also input the motor torque/speed curve separately?
If so I guess it is just used to develop some simple model of current drawn by the motor as a function of speed.
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(2B)+(2B)' ?
RE: 292 RPM induction motor on test stand
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(2B)+(2B)' ?
RE: 292 RPM induction motor on test stand
We will be performing a full voltage uncoupled run on the motor, and I need to size my distribution components so that they can handle the motor's no-load current. The motor will be run by a 480V generator through a step-up transformer. I was trying to figure out a way to start the motor direct-on-line without having to parallel multiple generators. I was going to use the step-up transformer as a "choke" to limit inrush current... but the transformer also needs to be large enough to handle the motor's no-load current. I will probably end up soft-starting the motor.