04-28-2008, 07:46 PM
The only requirement is having a powerful enough servo-motor with encoder, and a good power supply with plenty of capacitance to backup the current hungry motors during acceleration and deceleration. Regenerative Clamping is a must too.
Originally Posted by vroemm
The UHU HP advantage over the rest of the servo drives used in the hobby segment of the market, is its use of the available intermittent torque over the continuous stall current limit (up to 2.2 times the nominal torque) it makes the servo motor accelerate and decelerate a lot faster.
Handling high inertial loads, like a lathe spindle, is a good test for it and its new features. Those loads will probably make other drives, with less peak current capability, look bad.
Jozsi's tests have proven that the UHU HP drive is already a serious contender in quality, performance and price. I would like to see now what they can do in positioning applications.
The original UHU drive should also handle the spindle task if the cross-conduction problem does not show its negative effects.
The lathe spindle has a lot of mass, driving a drill or a cutter will be a completely different challenge because of the relatively bigger changes in torque during operation will probably require a very good PID tuning. That is a test I would like to see too.
04-28-2008, 08:06 PM
Just let me say two words : VERY VERY NICE!!!!! (O.K. maybe 3 words). The acceleration and deceleration look beautiful, on the current meter. The machining of titanium was impressive also. Nice work !!
PS, Just wanna say thanks to Uli, Kreutz and the many others who contributed to this project, there are too many to name. This has to be one of the best threads I have ever read. Let's keep the open source alive. This discussion proves the great things that can come from it.
04-29-2008, 09:39 AM
the Kerutz UHU HP servo drive
I hope the satisfaction in seeing the spindle control the Kreutz HP UHU is capable of is as satisfying to you (the Designer) as it is for the (worker bees) contactirfu & Tenmetalman. Thanks again for all of your support.
Question, I have some 470 pF 50volt ceramic disk capacitors on hand, are they acceptable for use in the latest revision ?
Last edited by tenmetalman; 04-29-2008 at 09:40 AM.
Reason: spelling error
04-29-2008, 09:49 AM
Originally Posted by tenmetalman
Yes, you can use those capacitors.
And, from my point of view, there are no designers and working bees, there is only one "HP UHU team" we all belong to, that includes the original UHU designers too, without them, and all of the readers, we would not have this thread....
04-30-2008, 11:41 PM
Dear All ,
My name is Phat , live in South of Viet Nam . I need a DC servo motor as some information as follows :
- SANYO DENKI Supper R
- 300 W , 80 V , 4.8 A , 2500 rpm .
My CNC machine is corrupted , That is machine NISHINBO
Please help me find out if every body have it . And reply me at this site
or firstname.lastname@example.org , email@example.com or firstname.lastname@example.org
Sorry because of my English .
Best Regard .
05-01-2008, 01:14 AM
Up To Date Parts Lists
Per the latest changes, Here are the revised Parts Lists. For the LESS than 11Amps Continuous Nominal Current:List A. For MORE than 11Amps Continuous Nominal Current List B: If you want to see the O.C. LED working when reaching the current limit follow the instructions on Post #1877 by Kreutz
05-01-2008, 02:50 AM
05-01-2008, 09:04 AM
I would like to know how small the motor I can drive with a uhu can be. I have some uhu drivers and just for a few weeks I want to use them with some very tiny motors. The motors are the EMG30 seen at http://www.active-robots.com/product...01-drive.shtml
Can anybody see any reason why they wont work ? or any mods I need to do to make them work ?
05-01-2008, 12:24 PM
This is my first post on this forum,
i have been trying to order kits of parts for HP UHU as suggested on the
wiki, but have not recieved any reply.
can anyone point me in the right direction to get these.
05-01-2008, 03:58 PM
Originally Posted by mick22
just drop an email to email@example.com or direct to Irfan, (contactirfu above) . The reply is coming soon, there is no need to worry...
05-01-2008, 04:16 PM
thanks for the info.
05-01-2008, 05:24 PM
Originally Posted by lamestllama
They should work with the original UHU drives using 12 volts or higher motor voltage. Use only one 0.1 ohm sense resistor (instead of 5 in parallel) in order to improve the signal to noise ratio. Adjust the comparator reference voltage to 0.1 times the peak current of your motor. For 12 volt motors you should use a 15 v power supply.
Last edited by kreutz; 05-01-2008 at 08:04 PM.