- #1
Rick Rowlands
- 8
- 0
I just registered for this forum as I have a problem that needs solved. I am building an industrial museum in Youngstown, Ohio, and the centerpiece of our collection is a 230 ton stationary steam engine which we saved from a local steel mill. I am designing an electric drive for it so that we can roll it over at 15 rpm for demonstration purposes. Before I go any further here is a photo of the engine.
http://inlinethumb19.webshots.com/18130/2908668190033749120S600x600Q85.jpg
The crankshaft and flywheel weigh 230,000 lbs., and rest upon two babbitt bearings, 23" dia. x 40" long. The bearings will have a pressurized lubrication system feeding oil to the underside of the journals before startup, so the coefficient of friction may be around .015 or less. The flywheel rim is 20' dia. and has a 24" square cross section, weighing 102,000 lbs.
I want to run the engine at 15 rpm for the demonstrations.
We have some equipment here which I plan to use for the drive. We have a 20 HP series wound DC mill motor with a full load speed of 725 rpm, drawing 76 amps. The motor has a short term rating of 30 HP, 575 RPM at 116 amps. This motor will drive a planetary gear reducer with an 18.9 to 1 ratio, then from that reducer there would be a double 140 roller chain with a reduction of 2.56 to 1 before finally coupling to the engine crankshaft.
What I am concerned is if the drive has sufficient power to bring the engine up to speed, and how long would it take to accelerate to 15 rpm. Also I am looking to determine what the resistance should be for each step of a five step DC controller, as I will be using control equipment from a DC crane to operate the motor.
For more info. on our industrial museum project visit www.todengine.org or Google Tod Engine.
Thanks
http://inlinethumb19.webshots.com/18130/2908668190033749120S600x600Q85.jpg
The crankshaft and flywheel weigh 230,000 lbs., and rest upon two babbitt bearings, 23" dia. x 40" long. The bearings will have a pressurized lubrication system feeding oil to the underside of the journals before startup, so the coefficient of friction may be around .015 or less. The flywheel rim is 20' dia. and has a 24" square cross section, weighing 102,000 lbs.
I want to run the engine at 15 rpm for the demonstrations.
We have some equipment here which I plan to use for the drive. We have a 20 HP series wound DC mill motor with a full load speed of 725 rpm, drawing 76 amps. The motor has a short term rating of 30 HP, 575 RPM at 116 amps. This motor will drive a planetary gear reducer with an 18.9 to 1 ratio, then from that reducer there would be a double 140 roller chain with a reduction of 2.56 to 1 before finally coupling to the engine crankshaft.
What I am concerned is if the drive has sufficient power to bring the engine up to speed, and how long would it take to accelerate to 15 rpm. Also I am looking to determine what the resistance should be for each step of a five step DC controller, as I will be using control equipment from a DC crane to operate the motor.
For more info. on our industrial museum project visit www.todengine.org or Google Tod Engine.
Thanks