Well I am sure the operators are concerned but they only can work with what they have been given.
I would have replaced this machines drive by getting a torque measurement of the input shaft with a piece in contact with the rolling mill. Then I would have purchased a gear box with a high ratio...
Well spot on reply there. Inertia was huge on the old motor. Even at only 70 hp max,
that old antique dc drive and tacho would ramp her up when the piece hit the mill.
I tried to insist that we needed a gearbox in front of this install to get some speed out the motor. They declined and well this...
proper attention to which leg is firing seems to be a potential issue.
have you seen this article listed below?
http://electrathonoftampabay.org/www/Documents/Motors/Brushless%20DC%20(BLDC)%20Motor%20Fundamentals.pdf
Appreciate all the replys, I still think it is too big for the job, wrong regardless of how the drive makes it appear cost effective, the fact is the motor is never ever even gonna get close to running at 50% or more load. thats where I am looking at effiency to start.
As i said before there is...
I appreciate the input. Let me elaborate further on this install. The old motor was only able to provide 75 hp, (limited by the power the mg set provided to it), then it
should be able to be mathematically derived as to how much torque was actually being delivered to the load.
Remember this was...
I work in a facility that just recently replaced an old 750 hp dc submarine, (yes submarine) motor.
This dual armature motor was used on a rolling mill, which sees intermittent loading.
basically thin sheets of metal coming through once every 10-15 seconds.
The failed sub motor although rated at...
