Motor operation at more than rated speed
Motor operation at more than rated speed
(OP)
In one of our newly commissioned plants we have a motor Motor ( rating 415 V,2.2 KW,4.3 Amps, 1455 rpm).This motor is powered through VFD ( V/f control ). The normal operating range for the motor was 265 to 1465 rpm . However for meeting the process requirement , the motor is required to be run at 2300 rpm .While achieving the same through VFD , we were able to achieve 2300 rpm at around 455V . The load current measured was around 1.4 to 1.6A which is within the rated current for the motor. Also no heating is observed in the motor while running at 2300 rpm.My query is that whether it is possible to keep operating this motor continuously at 2300 rpm . What are the problems that we may face ?





RE: Motor operation at more than rated speed
Bearings could be a problem, but I don't think that will be an issue at that low speed.
Gunnar Englund
www.gke.org
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Half full - Half empty? I don't mind. It's what in it that counts.
RE: Motor operation at more than rated speed
1) Just because you CAN does not mean you SHOULD
2) My opinions are all null and void the moment the motor parts start flying around the room...
The point is, this is a question that can really ONLY be answered with any authority by the manufacturer of the motor. There are 4 issue of contention: Cooling, bearings, balance and torque, and the torque issue really relates back to causing an overload. So if you are not causing an overload, which your stated evidence suggests, then the 3 issues are specific to that particular motor. As a GROSS generality, most motor mfrs only use one set of bearings that are used in the 2 pole designs, so are going to be rated for that speed (ie 3000RPM in your case). But is that 100% universal? Absolutely NOT, so only your motor mfr knows for sure. The same can be said for rotor balancing. Cooling" no idea.
Call your motor rep and ask them.
"You measure the size of the accomplishment by the obstacles you had to overcome to reach your goals" -- Booker T. Washington
RE: Motor operation at more than rated speed
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(2B)+(2B)' ?
RE: Motor operation at more than rated speed
"You measure the size of the accomplishment by the obstacles you had to overcome to reach your goals" -- Booker T. Washington
RE: Motor operation at more than rated speed
But, a 2.2 kW motor that doesn't draw more than half rated current at the moderately higher speed doesn't deserve all this anxiety. The bearings will be fine. The windings will be fine. The motor will be fine. I guarantee that. And, if that motor fails, I have several motors in that size available over here in Granbergsdal. Just come and get one!
Gunnar Englund
www.gke.org
--------------------------------------
Half full - Half empty? I don't mind. It's what in it that counts.