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desertjoe 
Orange Level Access
Joined: 23 Sep 2013
Location: New mexico
Points: 13358
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 Posted: 04 Jan 2019 at 6:44am |
I always enjoy the heck out of reading Dave Kamp's articles on all things technical,,!! This guy knows his way around all thet stuff, but best of all can explain things so dummies like me can understand some of it. I really enjoyed visiting with him for a couple of hours, a few years back. Altho,,,,he was prolly bored to smithers listening to this old country guy,,,,,  ,,,but,,,,but,,,I DO know something bout D14 engines,,,,,  ( I know he was facinated with eating breakfast at same place GWB did),,,,  Come back and see us sometime, Dave,,Ya hear,,??
Edited by desertjoe - 04 Jan 2019 at 6:45am
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DaveKamp
Orange Level Access
Joined: 12 Apr 2010
Location: LeClaire, Ia
Points: 5637
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Posted: 06 Jan 2019 at 12:29am |
I'll do that, Joe. Dunno when I'll get dispatched that way, but I won't sneak through without givin' ya fair warning.
The little VFDs I use to run my lathes, mills, and grinders... they're the baby brothers of the 3-phase traction inverters that propelled the trains I used to teach classes on.
Those trains were anywhere from 650v up to 25,000v... 250hp to 800hp motors... and of course, the trains had 'auxiliary inverters'... they ran constant 60hz, and generated 480v 3ph, 230v 3ph, and 120v, as well as 72v battery-charging...
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Ten Amendments, Ten Commandments, and one Golden Rule solve most every problem. Citrus hand-cleaner with Pumice does the rest.
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desertjoe
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Joined: 23 Sep 2013
Location: New mexico
Points: 13358
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Posted: 06 Jan 2019 at 8:47am |
Ten Four,,Dave,,,,I'm gonna keep you in mind for some assistance on something I'm wanting to do on my Air Compressor driver. It currently has a Leland-Farady 3HP 1740 driving the AO Smith V4 single stage and does good most of the time, altho I have been noticing that sometimes the motor lugs down quite a bit and that ain't doing the motor any good. But then the next 100 restarts, it just runs smooth,,prolly just old windings,,,??? I bought a 7.5 HP 3 phase 1750 that I plan to some day get a phase convertor to use it on the compressor,,but they keep telling me they want real dollars,,,,,,
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DREAM
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Joined: 06 Jan 2010
Location: Elberton,GA
Points: 1828
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Posted: 11 Jan 2019 at 7:30pm |
Got a "roto-phase" phase converter in the shop for the odd 3 phase thing or two I need to tinker with. One day im gonna score a transformer so I can have 480 3 phase. Like you said though, VFD is the best and cheapest way to go. Most drives that I deal with are Magnatek(Modified Yaskawa) or Power Electronics(not sure, but I think they build their own). Most of these are Overhead crane purpose built drives. They don't have a ton of options, since they aren't broad spectrum drives, but they are more durable and stand up to vibration and heat well. They still have auxiliary inputs and outputs that are programmable for things like travel limit switches and motor mounted electromechanical brakes. Most will take analog input or digital up to 5 speeds references plus reverse run. Good thing about the PE is they have an internal braking resistor up to 5 hp (480 volt rated drives), whereas Magnatek drives all require external braking resistors. Lot of inertial load for travel and hoisting motions on cranes, plus short decal times are desired for safety purposes. A lot of hoists now use a closed loop vector drive with encoder feedback instead of open loop systems with a mechanical load brake. Closed loop system does well with keeping load overspeed under control. Just think, not long ago we were cursing Reliance DC drives and replacing a lot of power cubes and field contactors to keep them going, not to mention changing brushes and cleaning commutators.
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I didn't do it! It was a short, fat, tall, skinny guy that looked like me!
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shameless dude
Orange Level
Joined: 10 Apr 2017
Location: east NE
Points: 13611
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Posted: 11 Jan 2019 at 8:37pm |
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I can see it coming....Dave,Joe,and Dream are gonna be mixing up a locomotive engine and an Allis!
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chaskaduo
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Joined: 26 Nov 2016
Location: Twin Cities
Points: 5203
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Posted: 11 Jan 2019 at 9:27pm |
LocoAllis or maybe AllisMotive. 
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1938 B, 79 Dynamark 11/36 6spd, 95 Weed-Eater 16hp, 2010 Bolens 14hp
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