Positioning a linear stage incrementally

I found a driver that runs my ESP300 stages from Position 1 to Position 2. However, I need to move them incrementally in steps and have a time base for these movements. Is there a way I could use most of the same code from the driver but change the positioning method?
Attachments:
Drivers_ESP300.zip ‏1277 KB

I have made a handler that deals with this Newport controller and I run the motors from one position to the next and back to start again in several steps, and I didn't have to use too many commands to make this work. My program run the motors by absolute values (i.e. by first finding the home position and then moving to an absolute position) or by relative values.
I ended up with using only these commands to control the axes:
Read Actual Position
Get Axis Motion Status
Get Motor Status
Motors On
Write to motor controllers (using compact command structure):
Axis 1=1OL0.01;1OH0.05
Axis 2=2OL0.01;2OH0.05
Move Home (Either by "Find Negative Limit Signal" or "Find +0 Position Count")
Move Absolute
Move Relative
Motors Off
The Axis setup above shows only an example of what I needed to set. The manual explains the exact syntax to be used.
The difficult part of my program was not to control the motors, but to keep track of my desired end-positions and when to move back and stop. Anyway, it seems you will come best out by using only relative movements in a loop.
There is one thing I discovered when investigating the controller and its software: You can program the controller to do most of the stepping and have LabVIEW to only start, monitor and maybe stop the motors. Maybe that would be an easier solution?
In any case it could be helpful to intall the ESP-Util program that's part of the software that ships with the controller. Along with the installation I think will also come the default setup-files for the controller axes in text-format. If not, you can use the ESP-Util to generate the text files containing the current setup for the axes. By reading the various settings in the files along with the commands in the manual you may get an idea of how the axes are currently configured and what parameters to maybe change.

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Stepper Motor with Linear Stage (Position Control and Data Acquisition)

Hey All,
So.. I've attached a stepper motor to a linear stage and so far it's working pretty well. Using a stepper motor driver from Pololu, I've simplified the control of the motor by just using output pulses from the counter output of a PXI-6143. I've tested the motor using the Pulse Train examples in LabVIEW and all is working well.
My goal now is to allow the user to collect data from a pressure sensor, attached to the linear stage, every X number of steps. From what I can tell so far, and please correct me if I'm wrong, the motor step movement is synchronised with the pulse train input. That is to say, if I give the motor a 200 step pulse train, the pulse train ouput is completed at the exact time the motor has moved 200 steps. From this, I've created a VI that moves the motor X steps, aquires the data point, and then repeats this process for the required amount of data points. The problem with this is that the motor movement is not continuous; it stops for a split second to take the data point.
How can I have labview ouput a pulse train of say 1000 steps and record a data point every 50 steps?
Two ideas that came to mind were:
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I wanted to stay away from theses ideas though since they require resources from the DAQ card.
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Hi Ryan,
Just to cover all the bases, what version of LabVIEW are you using and can you attach your VI? Initially your ideas sound like they should work, do you expect to be nearly maxing out the DAQ?
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I have a linear stage driven by a voice coil actuator (VCA), a capacitive probe is used to measure the movement of the stage. A picture is attached to show the basic mechanical design of the stage. Even though the resolution of the VCA is 0.5 um, the overall resolution of the stage is not that good. When I use controllers to achieve position controller of the stage, the stage is always chattering around the set value. It can only achieve 5 um in open loop and around 10 um in PID control. Is there any method to improve the performance by modifying the controlling VI?
I am using NI 6363 to give voltage signal to a LAA amplifier and the amplifier will convert the voltage signal to current signal and drive the VCA. It seems that the output of the LAA amplifier is not constant and it is the LAA amplifier that generate those chattering. The command voltage given to the amplifier is extremely constant with error less than 2mv, which will cause only 0.5 um displacement of the stage by theory. Such kind of motion is similar to the resolution of the sensor but it is only 1/10 of the actual motion noise which is on the scale of 5 um.
The stage has a natural frequency of 30 Hz, which is determined by the stiffness of the springs and the mass of the moving stage. When I use FFT to analysis the movement of the stage, I found that the main noise comes from 30 Hz and 50 Hz (both for open lood and close loop PID). I also use FFT to analysis the command voltage given to the VCA in close loop PID control, the peak frequencies are 10 Hz, 30 Hz, 40 Hz, 50 Hz, 70Hz, 90Hz....
Do I need to use some filter between the amplifier and VCA so that it can reduce the noise without influence the accuracy? Or I can reduce such noise just by using some noise block in the VI program?
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best
Attachments:
VCA stage.png ‏160 KB
FFT of Error motion with constant voltage_f1.jpg ‏1782 KB
FFT_command voltage_PID_f1.jpg ‏444 KB

Hi Paolo,
It seem the influence from the magnetic field is not a big issue in the position control of a voice coil stage(VCS). I attached some picture of the commecial design of similar VCS and all these stages do not shield the cable connecting the VCA and controller. Anyway, I will try this method to see if it can make the result better.
BTW, for the filter, could you please recommend some model for me? As the current noise is just around the level of 1 mA, I think I may need a very precise filter.
Thanks
best
Attachments:
vcs 1.jpg ‏49 KB
vcs 2.jpg ‏54 KB
vcs 3.jpg ‏22 KB

Looking for a motorized linear stage actuator to travel 4cm.

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I will need everything (motor, drive, cables, etc) since I have never done this before. I am currently trying to find a motorized solution that will move horizontally 4cm, and will quickly stop and start ~50 times during the motion. I have looked at several linear stages and actuators, and it looks like a stepper motor with open loop feedback will be best fit my needs since the position accuracy isn't much of concern. Let me breifly describe some of the requirements: It needs to complete a 4cm total distance in only a few seconds (at least less than 5s but less is better), the position accuracy/resolution only needs to be 0.1mm, I would like to use Labview to easily programically control the entire motion, the total cost (drive, motor, cables, etc.) should be low, the total load is only a few pounds, and it should have a small footprint.
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Hello again everyone. I just wanted to provide an additional update to my last post. I have also been talking with someone who suggested a Parker stepper driven lead screw stage, model: Promech LP28 with 50mm travel with limit switches http://divapps.parker.com/divapps/emn/pdf/PROmech.pdf. The suggested that I could use the IMS MForce Microstepping Drive as the most economical drive solution http://www.imshome.com/products/mforce_microdrive_mfi.html, or a galil driver. It seems that the IMS doesn't have as much labview support (only a few VI's) http://www.imshome.com/support/mdrive/programs/MCode_LV_86.zip, but the Galil drivers seem to be very easy to use with labview http://www.galilmc.com/support/appnotes/software/note4414.pdf. I don't know how much the Parker Promech stage was quoted at $600, the IMS drive at $250, and I don't know what the Galil driver cost but I was told it is more, and ~350 for cables and a power supply.
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Labview inconsistently crashes, Zaber T-LSM linear stages

Hello All,
I am trying to run 2 Zaber linear stages for a 24 hour period using the attached VI (relevant portion is the second while loop), but the VI has failed at various times after initiating the program. The longest they're run without interruption is 6.5 hours, but it often fails anywhere between less than 1 minute to over an hour. I've also gotten a blue screen immediately after clicking run on one occasion. When the VI fails, the run arrow at the top left of the screen is solid black, but whenever I click on pause or abort the program doesn't respond. The only way to get Labview running again is to close the program using task manager and restart the computer. I'm thinking it might be an issue with the computer I'm using, but I'm not sure. Any advice would be greatly appreciated.
Sincerely,
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Attachments:
cycle3.vi ‏40 KB

Hi tseykora,
Thanks for posting. I'm running a test here with your code on some Zaber devices to see if I can reproduce the issue.
A note on the other comments, for this application there is a purpose for the two-way 'Request' vi followed by a 'Read' vi. For Zaber devices, Device 0 is used to send the same command to all connected devices. The Request vi waits for the first response (after one axis completes it's movement) and the Read waits for the second response. An alternate way of handling it is to change the final '1' in the input clusters of the Requests to '2'. This input indicates how many responses are expected.
Waiting for these responses that come at the end of a movement allows the loop to pace itself; the commands are not being sent as quickly as possible in the main loop of your VI.
The initial loop is not set up optimally though. As gregoyj noted the initialize should come before the loop, and the Move Absolute command only needs to be sent once.
I've attached the slightly modified VI. These differences shouldn't have caused a crash as you were seeing though. I'll post again some time between 6 minutes and 24 hours from now.
Mike McDonald
[email protected]
Applications Engineer
Zaber Technologies
Attachments:
cycle3.vi ‏38 KB

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I am seeking a solution of controlling a linera stage with Labview:
Stroke ~ 18 inch
Resolution ~ 0.1 mm
Low price.
Do you have any recommendation on HW and SW? We are evaluating Animatics SmartMotor. Do you have a Labview for it? How EASY to program it for a simple scan motion? Thanks.

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You will need to use the DAQmx driver to acquire signals from your X Series device continuously at a set sample rate. See the LabVIEW example finder for a ready made example of how to do this.
The values you read will have to be compared to your desired setpoint like you mentioned.
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Good Luck!
~Nate

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test this code.
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I did figure out the answer to my question though.

Reset position for linear movement

Hi All,
I am using PCI 7344 and UMI7774.I am using three of its Axis.The first two axis are just used as a DRO ( DIgital Read Out) and the third axis is used to control servomotor.
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Regards
Manish Karnik

Hey I missed some point.
Hi All,
I am using PCI 7344 and UMI7774.I am using three of its Axis.The first two axis are just used as a DRO ( DIgital Read Out) and the third axis is used to control servomotor.
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Regards
Manish Karnik

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That should work!

NI Motion witth incremental encoder and precise position

I am currently working on a project that requires me to get the precise position (mesure) with an incremental encoder with 2 channels A and B. I am Using NI Motion, NI UMI-7774,NI PCI 7550, and Labview 10

Hey that's great!
I think you're in the wrong forum: http://forums.ni.com/t5/Motion-Control-and-Motor-Drives/bd-p/240
jigg
CTA, CLA
teststandhelp.com
~Will work for kudos and/or BBQ~

Positioning a linear stage incrementally

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