FPGA velocity estimation and VFD noise

Hi, I'm using an NI FPGA (a 7411, I believe) with an RT unit and VFD to get very low lag, high resolution velocity estimation from a 3600 pulse/rev quadrature encoder (mounted on the VFD driven motor). When the VFD is off and I turn the encoder by hand I get very good tracking and low noise. With the VFD enabled, however, the system is very noisy and usually has about a 1-5% error. The whole system needs to have as little lag as possible (<.01ms).
I'm looking for ways of reducing noise in the system programmatically on the FPGA or of enhancing the noisy signal to make the system more sturdy.

Can you change the switching frequency on the VFD?
Is wiring to motor in conduit? Is conduit metal? If so is it grounded?
Failing that, many cable manufactures now offer armored cable designed just for VFD applications they may reduce radiated emmisions compared standard thre phase cables.

Similar Messages

VFD noise on other sensor output such as : Thermocouples, Accelerometer, Torque meter

Hi,
I'm using a PCIe-6351 Daq board (and SCB-68) for my test rig. I'm collecting different kinds of sensor outputs through this DAQ board such as temperatures, acceleration, and torque meter output.
beside that, I have connected a VFD (Baldor H2 inventor) using a USB cable to the PC case. I use this VFD to control motor speed. (http://www.baldor.com/products/accontrols/vs_inverter.asp)
Here is my problem:
when I turn on the VFD I get a lot of noise on every signal. This noise is like a peak which repeats every 5-6 seconds.
So it's not 50-60 HZ noise of outlets.
You can see related uploaded video clips on :
http://www.megaupload.com/?d=4NHDIVV7
http://www.megaupload.com/?d=2461Z7KN
I have uploaded some pictures too.
Is there any way that I can filter this noise in Labview? ( I have tried Filtration VI in labview, but couldn't find a correct setting)
How can I get rid of this noise?
I really appriciate your help on this matter.
Thanks.
-Jeff
Attachments:
Pics.zip ‏585 KB

I can very much identify with this issue. I have a test bench with two motors and corresponding Baldor H2 VFD's on it. I have a variety of sensors such as accelerometers, hall effect sensors, and a torque meter. The bench was put together "professionally" but still get this kind of noise.
The *only* sensor that I have this trouble with is the torquemeter. I get an impulsive EMI blast every 12 seconds on this signal with just one drive turned on. With the other drive turned on, the noise is excessive. I have spent weeks troubleshooting assumed ground-loop faults with the torque meter company's tech rep - to no avail.
I have confirmed that this EMI is from the drive. I hooked up a wire to the signal lead of an oscilloscope's VFD (acting as an antenna) and the noise I get on this oscilloscope is very similar to what I get on my torquemeter. (The noise is present only when the drive is powered up)
The noise from the VFD will not be cured by using a low pass filter. Impulsive type events have very broad band noise.
My new approach is to try and use adaptive noise cancellation to get rid of the the VFDs' EMI on the torquemeter. I gather the noise signal on my DAQ card (PCI-7851-R) by plugging just one wire into the positive port of an AI port and tying a 1 mega Ohm resistor from that port's ground to the AI port; this provides a means of collecting the EMI from the drive with an "antenna." The wire dangles by the side of the VFD with the other end taped up. See the following for a description of adaptive noise cancellation with labview (also possible on an NI FPGA device):
http://zone.ni.com/reference/en-XX/help/372357A-01/lvaftconcepts/aft_noise_cancel/
I believe this to be the only sound signal processing means of addressing this issue. I am still struggling to get it to work myself. I'll advice as I progress.
Cheers
Jordan McBain, PhD
LabVIEW Controls Engineer
Revolutionary Engineering

What's the FPGA step size and how to calculate it?

Hi there,
I inherited an vi with problem in it. It's basically reading the binary file then display it. So the vi reads the binary file by using Read From Binary File, the output data from this function then sends to FPGA after multiply a number (32767/10). But unfortunately I got a wrong output. The final output value for some reasons looks got attenuated. People told me maybe it's related to the FPGA step size, so I want to know what is the FPGA step size and how to calculate it. Can someone answer my questions here?
Thanks in advanced!!!

Hi Weny,
It sounds like you are trying to find out the output resolution of your FPGA module. It would be helpful if you provided what FPGA module you are using in your tests so we know what information to provide. For instance, the R Series Manual provides information on how to calculate the required DAC output code to generate the desired output voltage. You should also try to keep the accuracy of your device in mind. The analog output signal you are generating will be subject to gain, offset, and noise errors. You can use the specifications sheet (such as the R Series Specifications) of your device to determine what accuracy your board will have. The specs also provide information on the resolution of the board. You can search ni.com for the manual and specifications for your particular device if you are not using R Series.
Regards,
Browning G
FlexRIO R&D

Iphone 5s Echo and Swoosh noises during active call

Hello All,
I purchased a new iphone 5s around a month back and I consistently get echoes of my own voice and swoosh noises during call. This happens irrespective if I make the call or an incoming call is answered, from any location like my room and on the street (No tunnels, elevators, etc). I originally thought it was because I receive notifications like texts or if my cheek touches the display, but I hear this noises and echoes even if I am on headphone (both apple and other branded headphones). Is this is a known issue, if so how do I resolve it ?
Thanks

Flip the silent switch on the side of the iphone.

Hard drive and mouse noise over speakers

Hello all,
I have a iMac and just recently have noticed hard drive, mouse and buzzing noise coming over my powered speakers. I have been a home recoding musican for the last 10 years and just recently moved to California. Since I've been here I'm now hearing all of this unwanted hard drive, mouse and various other noises coming thru my powered speakers. Even turning down my speakers to 0, having a deadicated power strip/noise surpessor on ALL of my devices, im still getting these noises. Like moving the mouse you hear staic thru the speakers.
Any idea where to start looking into this problem? Need a solution as this is killing me.
thanks for your help in advance.
- M

I hope this helps...
I also had a problem with fan noise. It not only creates more than normal noise, but i notices a difference in my battery life... it was really bad.
Well after using istat pro i notices a activity that took up about 85%-95% of my processes.... And stated 'Canon ip5000'.... this was my printer that wasn't attached!
I opened activity monitor to search for this process... i couldn't find it under that name. However, i did notice a printer agent of sorts (i can't remember what it was called).
Anyway, after quitting this process my fan almost immediately went from 6000rpm to 2000rpms and the noise was almost gone! And my battery life that was sitting on 24 mins (after a full charge and 40 mins!!) and then went up to 1hr15mins!
What a difference.
I'm using tiger... and the only difference that remember doing was updating the printer driver... hey presto.
I'm sure that is the issue with a lot of people... that some sort of deamon is running in the back ground and is taking an alwful lot of processor time!!!
Hope this helps!

Why does PhotoShop CC 2014 crash my Windows 7 Professional 64-bit PC every time I try to use Sharpen/Blur Reduction and also Noise Reduction ??!!!???

Hi Adobe
You a have a really wonderful PhotoShop CC product. It's really great, and I know new versions such as 2014 have their teething problems.
But I am getting really sick of my Windows 7 Professional 64-bit PC being crashed whenever I try to use PhotoShop CC 2014 Sharpen / Blur Reduction and also Noise Reduction.
This happens both with JPG's and PSD's.
Please sort your **** out and get some patches out to address this quickly !!
Chris Tattersall

Chris,
It doesn't crash for everyone. A person could be forgiven for saying, in return, "Please sort out your **** system problems".
Trust me when I say many, many problems are caused by the computer system setup not being up to the needs of this cutting-edge graphics software. Photoshop is heavily dependent on the GPU, and GPU drivers are notorious for having bugs (they're primarily written to run games).
However, that being said, recent driver releases from both ATI and nVidia do actually work pretty well with Photoshop CC 2014.
What video card do you have?
What display driver version are you running?
If you're unsure how to tell these things, go into Photoshop, choose Help - System Info, copy the data, and post it here.
-Noel

How do I select notes in a given velocity range and fix them to a new value

Hello. How do I select notes in a given velocity range and fix them to a new value? I believe you can do this with the Transform window, but I can't figure it out. I can select ALL the notes and fix them to a value. But I want to select the notes within a range (and there are many) and fix them to a new value. Thanks for your help.

The transform window will also select, as well as operate.
Select Notes = Velocity within 20 > 40 (or whatever) and click Select only.
You've just selected all notes within that velocity range. You can now use different transform criteria to "Operate" only on that selection, or use the other editors with those notes selected.
For more on transform:
http://logicquicktips.blogspot.com/2006/10/transforminating-part-1.html
http://logicquicktips.blogspot.com/2006/10/transforminating-part-2.html
http://logicquicktips.blogspot.com/2006/10/transforminating-part-2a.html
http://logicquicktips.blogspot.com/2006/10/transforminating-part-3.html

My 4th gen classic makes a continuous whirring and clicking noise and is not recognised on iTunes. Any ideas?

My 4th gen classic makes a continuous whirring and clicking noise and is not recognised on iTunes. Any ideas?

That could be a clear sign of a damaged hard disk. Can you try and force the iPod into Disk Mode and then connect it to iTunes so you can attempt a restore or even a low level reformat of the iPod's HD/file system.
Putting iPod into Disk Mode
B-rock

Late 2009 Mac Mini odd Super Drive Loading and Ejecting Noise

I have had no problems with my Mac Mini until now. Just today I inserted a disk into the super drive and it made a different noise to usual as it took the disk. Also, when I ejected it, it made different noise to what it usually makes. The drive still reads and writes fine it is just the loading and ejecting noise I am worried about.
Help would me much appreciated
cp1996

Sounds like you should be expecting the drive to fail more or less any time now. If the thing is still under warranty, take it in and try to get it replaced. There is a category for abnormal noise when selecting the failure type, so you should have a decent chance. But only if it's under warranty.

When i plugged my ipod into the computer it started to make buzzing and screeching noises. It became hot so i removed it and then the screen froze while it continued to make these noises. I have never had anything like this happen.

When i plugged my ipod into the computer it started to make buzzing and screeching noises. It became hot so i removed it and then the screen froze while it continued to make these noises. I have never had anything like this happen. (never gotten it wet or had it exposed to extreme temperatures) It is also unresponsive to any buttons on the ipod and it didn't show up when i plugged it into my computer. What do I do? Also if it is unfixable could i get a free one from apple?

Hey briannagrace96,
Welcome to Apple Support Communities! I'd check out the following article, it looks like it applies to your situation:
iPod: Appears in Windows but not in iTunes
http://support.apple.com/kb/ts1363
You'll want to go through the following troubleshooting steps, and for more detail on each step follow the link to the article above:
Try the iPod troubleshooting assistant:
If you have not already done so, try the steps in the iPod Troubleshooting Assistant (choose your iPod model from the list).
If the issue remains after following your iPod's troubleshooting assistant, follow the steps below to continue troubleshooting your issue.
Restart the iPod Service
Restart the Apple Mobile Device Service
Empty your Temp directory and restart
Verify that the Apple Mobile Device USB Driver is installed
Change your iPod's drive letter
Remove and reinstall iTunes
Disable conflicting System Services and Startup Items
Update, Reconfigure, Disable, or Remove Security Software
Deleting damaged or incorrect registry keys
Take care,
David

Cracking and popping noise Sound Blaster x-Fi Platinum Running on Windows 7 32 Bit

Hi everyone, I am using a x-fi platinum card and it simply wont work with Windows 7 Ultimate 32 Bit. I have been using both windows 7 public beta and release candidate for last 8 months. Let me give you my PC configuration.
Intel Pentium D 3.4GHz
2GB DDR2 Memory running in Dual Channel Mode
ATI Radeon HD 4670 Video Card With 52MB DDR3
It has a built in sound on mother board (Disabled at the moment)
With the above configuration I tried using my x-fi platinum on both Windows XP and Windows Vista, and it worked perfectly without any problem. When I upgraded to windows 7 beta for the first time with the creative beta driver for windows 7, I noticed that whenever there is any on screen activity, such as minimizing and maximizing windows, switching windows, scrolling, photo or webpage transition, etc. there are cracking and popping noises. And if there are continuous or too much activity on the screen at some times the sound card completely fails and unable to provide any sound. When I took the sound card out and enabled the on board audio chip (Realtek HD Audio), the sound was fine without any cracking or popping issue. I eventually upgraded to Windows 7 RC and also currently using the latest driver for windows 7 and I am still having the same problem. As a reasult I am being forced to use the on board realtek audio solution which provides really crappy sound compared to x-fi platinum.
It appears that the problem exists only when I try to run x-fi platinum on windows 7. I really hope there is a solution for this otherwise I will have to sell my beloved sound card which I have been using for at least 3 years on ebay and stick with low quality Realtek HD sound system.

Sille wrote:
seems X-FI cards got the problem.... shud be hotfixed by creative.
Not all of them, I have none of those problems with my Xtreme Music. This won't help the guy asking about the Xtreme Audio (search the Sound Blaster section for the one for your card), but using this,
http://forums.creative.com/t5/Sound-Blaster/SB-X-Fi-Series-Support-Pack-2-0-05-5-2009/td-p/527485
with this installed over the top,
http://forums.creative.com/t5/Sound-Blaster/SB-X-Fi-Series-Auzen-Forte-driver-2-20-000-HomeTheater-HD-RC4/td-p/53548
I don't get any of the popping and cracking that others do.

Noise reduction - RAW fine tuning and the Noise Reduction tool

Hi,
1- If I get it right, Aperture's RAW fine tuning "Automatic noise compensation" (translated from French) option uses the camera's information to adjust the noise. Is that correct?
2- The Noise Reduction tool is there to provide additional noise reduction, but this makes you lose some details. Is that correct?
3- How do you use them? I often find the Noise Reduction tool a bit overkill, but that's me.
4- This one is just out of curiosity. How does A3 compare to LR3 beta for you in that regard? In my testing, LR3 did a slightly better job (but A3 totally beats the crap out of LR2 for noise). BUT I have an old D50, and newer cameras handle noise better (especially Nikon), so does it really make a difference for a 2008 or newer camera?
Thanks!
Manu

Manusnake wrote:
pilotguy74 wrote:
I don't even have this option/checkbox in my Raw Fine Tuning brick.
I wonder if it's due to the type of files (Canon 7D). Do you still have those 7D files I sent you? Does the checkbox appear in Raw Fine Tuning for you with them?
I noticed this option in the manual the other day, but forgot about it until now.
True, it doesn't have the checkbox with the 7D files. However, it as a slider "noise suppression" (again translated) in the RAW fine tuning options (and still has the Noise suppression brick).
If you don't have this one too, have you reprocessed your images with Aperture 3? Since it has a new raw engine, it may be the cause of it.
I find it strange that Apple didn't tout the new RAW engine on Aperture 3 new feature, it clearly is an improvement over Digital Camera RAW 2, especially in noise suppression.
I agree the built-in noise suppression is much better than A2, but IMHO it pales in comparison with the Noise Ninja plugin from Picturecode. The key is that you calibrate a profile for Noise Ninja by shooting a color chart full screen on your computer at varying iso settings with each of your cameras. You then feed the images back in to Aperture, and tell Noise Ninja to create a noise profile for each setting. The results are amazingly good.
Now with a lot of new cameras, noise processing is getting less important because the high iso performance is so good....but this is what makes Noise Ninja special...even when the noise adjustment is subtle, because it is working from a profile created with your camera, at the iso the shot was made at, its effects are seamless. They just announced a 64 bit plugin for Aperture 3, so no bouncing into 32 like other plugins at the moment...
Sincerely,
K.J. Doyle

Adding estimation and actual time information to SLFN tickest

Hello,
We want to track some basic information about estimation and actual work done in any single ticket. So, we want to add some fields such as:
- Number of estimated consulting and programming hours for each ticket
- Number of actual consulting and programming hours for each ticket.
Then we want to report on them.
Is there any easy way to do it?? Can we use "products"? Can someone provide some help in setting up this information??
Regards
Esteban Hartzstein

Hello,
This is something you can try.
Go to customizing:
SAP solution manager / configuration / Scenario specific settings / service desk / service desk / general settings / set up the original screen profile
Find the combination of screen profile type / transaction type = SRVO / SLFN
Change the screen profile to SRV_SLFN_2.
Go to transaction CRMD_ORDER, and create a message of type SLFN.
You will now notice that a button shows up called 'item details' between the fast entry and transaction data buttons.
Click on it.
There you can add your products, maybe one for planned time and one for actual time (remember to put the actual time before closing the message)
These fields will show in transaction CRM_DNO_MONITOR.
if you need to create products you transaction COMMPR01 and if you need to create product hierarchies use COMM_HIERARCHY.
Rgds.

After Effects - CC Vector Blur and Fractal Noise Rendering Issue CS3

Hey,
I am using After Effects for animation. I have drawn everything in Illustrator, imported into AE and added some effects like CC Vector Blur and Fractal Noise to generate water-like textures.
My problem: when I render as an image sequence (or video, or PSD), I don't get the effect. I'm assuming I don't have it properly set up for rendering and I am wondering how I can fix this.
I have precomposed water layers (which are three different layers; a blue solid overlay; and two masked layers with added effects) and added motion blur. Given this is the problematic area, I am also assuming this is where the problem is.
Any advice! Or else I'm screen shot-ing every frame.......ugghh.
CS3
Intel core 2 duo, E8400 @ 3 GHz, RAM 4 GB, 32-bit
1366 x 768 resolution
windows 7, service pack 1
(other specs can be provided, just be specific)
final png rendered:

timeline 1
timeline 2
image sequence settings
render settings

Horrible buzzing and clicking noise from the fan - DV6 3046eo

Hello!
Two weeks ago the fan on my DV6 3046eo laptop began to make almost continueosly buzzing and clicking noise. My laptop is less than an year old (bought in December 2010) and such noise has never occurred before. I have done some "research" to find the reason, but without luck. I have read on Internet that the fan may be broken or loose. I am just using the web and listening the music. I have to admit I played some demanding games on the computer, like BBC2 and Dirt3. But the problem occured later. I can't imagine what will happen if I play games on my laptop now...
The fan seems to cool down the laptop, but it is like something is hitting it every third second or soand preventing it from running silently. The noise is strange and irritating because the frequency changes rapidly. Sometimes when I move the laptop or hit it a bit gently, the loud noise suddenly disappears and the normal continueosly noise takes over (I am ok with the latter one, though). After some while it appears again. The noise come and go. Reboot doesn't help much. I have also used an airspray can, but to no avail. I am thinking about getting the fan replaced by HP before the 1 year warranty runs out. I am not too comfortable to do so myself. What's the reason for this noise and what should I do?
Thanks in advance!
Sandip

Still no comments?
I am getting sick of this noise. I can't bring my laptop to school because it makes too much noise. Please help me.

FPGA velocity estimation and VFD noise

Similar Messages

Maybe you are looking for