Can I control a stepper motor by a time varying velocity input?

I want to control the motion of the stepper motor by a velocity input that looks something like a Sine wave.The velocity is changing as a function of time. Can I change the velocity of the motor at a prescribed time interval?
Thanks in advance
Kevin

Thanks for getting back to me on this. The controller card that I have is the PCI-7342 controller card. The time of a cycle is about seven minutes. I want to ramp the RPM of the motor from zero up to a max value then return it to zero and then go in the opposite direction . A graph of the RPM vs Time is attached.
I thought that I could input an array of velocities into a Load RPM VI and specify the time for each input.I have not been able to do this as of yet, because the load RPM VI will not take an array input.
All these inputs would be made in labview so they are inputs for the controller card. I was under the impression that the controller card generates the steps and direction from the data entered in labview and sends the step and direction impulses to the driver. Do I have the method of operation right?
Do you think this is possible?
Thanks again

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How can I control 3 stepper motor in same time?

I want to control 3 stepper motor and 30 electro-valves.
I only had a few lessons on how to control one in C in college.
Now I need to do this in labview and using an board from NI
How can do the control of the three motors in same time?
What the best board to do this. Maybe the NI PCI 6034.
But I will need more than one?

At least some of the NI motor controller boards have up to 32 digital lines which can be set to input or output. I did not write the software for our systems but we are using quite a few of the digital lines for our systems and have no problems reading the digital inputs or setting the digital outputs. Also, the digital outputs offer a high current sink capability and usually can be used to drive external drives without any interface circuits.
The digital lines are available on a separate connector of the NI boards and there are also break-out boxes (with screw terminals) available. I do not see any serious problems to do your control tasks just with one NI motion controller board, as long as you do not have any special requirements (high sampling speed, high frequency pulse output etc) for the digital lines.

How can I control 3 stepper motors w/ amplifier by sending TTL pulses from DIO96

We have NI PCI-DIO-96 board and we have 3 stepper motors with amplifier and encoders. We want to control the motors by sending TTL pulses directly from the DIO-96 board to the amplifiers. Is this possible? What would you recommend if this is not a good approach? Thanks in advance.
Roman Zeylikovich

Roman,
Thank you for contacting National Instruments. While using a motion controller would be the recommended approach for any type of motion application, you may be able to use your DIO board to generate a TTL pulse train to control the step and direction inputs of your drive and motor. You will need to make sure that the current sinking and sourcing specification for the DIO-96 fits your stepper motor. That board is not designed to source very much current at all so this is one issue you will need to verify. Also, this board does not have any counter/timer logic that can handle quadrature encoder inputs.
Again, this digital device is probably not the best solution to control a stepper motor, but, depending on your hardware, could be configured to work proper
ly. The PCI-7334 is a low-cost stepper motion controller that can control up to 4 axes and is designed to easily accommodate these types of applications. You can browse through more information on our Motion controller boards at the following website:
http://sine.ni.com/apps/we/nioc.vp?cid=3809〈=US
Let us know if you have any more questions or comments.
Regards,
Michael
Applications Engineer
National Instruments

Time varying velocity input for servo motor

I 'm running a PXI-8145RT CPU with a 7344 motion controller.I want to load a time varying velocity profile for my servo motor.How can I do this? The "load velocity" tile does not have an input for such a profile,but only for a maximum velocity that will be reached after a certain time.

Are you using the Motion Assistant or a programming language like LabVIEW? If you are using the motion assistant, you can do a contoured move with a Position-Velocity-Time Profile. I have never done this, but it sounds to be what you are looking for. This assumes that you have a controller that can do contoured moves.
Hope that this helps,
Bob
Bob Young - Test Engineer - Lapsed Certified LabVIEW Developer
DISTek Integration, Inc. - NI Alliance Member
mailto:[email protected]

How can I control a stepper motor drive using a DAQ card?

I need to control a simple CW/CCW stepper motor drive using a DAQ
card. I simply need to output a 5 volt signal and then a drop in
the signal, and so on 200 times or steps for 1 revolution. I have
desiigned the basic program, but do not know how to output the
appropriate signal.
Cheers,
Matt

What DAQ card do you have? Ideally, one with a counter output to generate the steps, where you can control frequency. If you try to start the motor too fast (acceleration or abrupt application of fast pulses) it may stall out. Search in Help/Search for Examples for 'frequency' and 'pulse' for example of frequency generation. You can also use a digital output on the DAQ card to control direction.
If DAQ card does not have a counter, you coul do a software timed loop to toggle a digital output to generate the pulse train. It may not be fast enough nor accurate for your application, do not know from info you have given
~~~~~~~~~~~~~~~~~~~~~~~~~~
"It’s the questions that drive us.”
~~~~~~~~~~~~~~~~~~~~~~~~~~

What's the type of control for stepper motor?

Hi,
I'm using PXI-7358 controller, UMI-7774, Industrial Device NextStep third part microstepping drive, stepper motor SANYO-DENKI (type 103-8932-6421, NEMA42) and incremental encoder 3600 ppr (14400 count/round). I want to say what's the NI onboard type of control used to control motor step position? In the case of servomotor the type of onboard control is a PID, in the case of stepper motor what's the type of control? What's the MAX parameters to set for the project specific (overshoot, settling time, rise time etc..)? What does it means "Pull-in Window" e "Pull-in Tries" in MAX? So, it's possible control the stepper motor with user's algorithm control, excluding the onboard control?
Thanks for your patience,
Best regards
Lorenzo

>
Matt wrote:
> Go to SE24. Type in cl_dd_document and press enter. Select the methods tab. Look for the method "CONSTRUCTOR". Double click on it. Click on SIGNATURE button. The types of the parameters are clearly seen.
>
> matt
TYPE and VALUES OF TYPE -- different things. For example, TYPE C -- CHAR. VALUES of this: A, B, C, ..., 1, 2, 3.
Thus, return to question.
TYPES: sdydo_attribute(50) TYPE c
TYPE: sdydo_attribute
VALUES: ???
May be, value ABRAKADABRA correct?

Can I get a stepper motor to work useing an AO channel on a DAQ card?

Can I get a stepper motor to work useing an AO channel on a DAQ card? I know its a very low currentl coming out, but what Im going to be using the motor for is very weak. Has anyone tried this before? I certinaly dont want to spend 2,000+ on somthing that will be basicly moving a string on some pullys back and forth.
Thanks,
-Mark

Greetings, Mark
You can certainly use the A0 as a driving signal, but you need to amplify the current considerably to run a stepper motor. Additionally, most stepper motors require multiple phase driving signals to work properly. If I understand your application, I believe a stepper motor is a bit of overkill...you only want to use them when precise positioning and repeatability is an issue. You might look at some of the linear actuators available.
Eric
Eric P. Nichols
P.O. Box 56235
North Pole, AK 99705

How can I output a square wave to control a stepper motor using 7332 controller?

I have the following system configuration for testing a linear actuator (LA):
LabView 7.1
NI FlexMotion 7332 Motion Controller
NI Flex DMM 4070
The LA is a stepper motor with Step and Direction of Rotation inputs, as well as some discrete I/O for Power Enable and other functions.
The LA specification only requires that I send a 50% Duty Cycle square wave signal with frequency less than 300 Hz to it in order to make it step. The LA has it's own power source. I only need the 7332 to generate the drive signal and the DOR signal to the LA. Using some of the example VI's, I can get the LA to work, but I will need to incorporate the functions in to a custom application.
How can I weed through the numerous advanced functions the 7332 offers and only generate a DOR signal and a step command at a user-defined frequency. How do I set up the controller for this?
Thanks

Hello,
All the VIs that you can use to create a pulse train and digital I/O from your motion controller are found in the "Analog & Digital I/O VIs" sub-palette in the "Flex Motion" palette. Use "Load PWM Duty Cycle" and "Configure PWM Output" VIs to create the square wave. Use the "Set I/O Port Direction", "Set I/O Port MOMO", and "Set I/O Port Polarity" VIs to create digital output. I hope you find this information useful. You can learn about the specifics of these VIs and their inputs/outputs in the NI-Motion VI Help.
Regards,
Aaron B.
National Instruments

What kind of cFP can I use to control a stepper motor

Hi everybody !
I want to control stepper motors (like to control the opening of a My question is :

Duplicate post !

Controling bipolar stepper motors with usb NI-6008 DAC

hi i need help to get an example vi that explaining how to control two bipolar stepper motors using USB NI-Data acquisition card 6008, i have the drivers of the motors, could any body help me?
Solved!
Go to Solution.

you are more than welcome .. ok i attached a vi that could help you .. i'll illustrate how to connect your driver to your usb data acquisition card.
1-on the digital I/P O/P side of the DAQ there's a 5V pin, connect it to the both 5V pins (Pulse and Direction) of the driver.
2- the other 2 pins (Pul- and Dir-) connect it to port0/line0 for Pul- , and port0/ line1 for Dir-. ( you can configure the ports as u like from the block diagram window of the vi ).
3- let the enable pins without connection. ( it's normally enabled).
for motor connection: (dont connect any of these pins to the DAQ)
there are 6 pins.
first you need to know the wires of the motor coils, you could test it with any AVO meter.
1- the first pin connected to the ground of the battery.
2- the second pin to the positive pole of the battery.
3,4 the first coil.
5,6 the second coil.
try it and i hope i helped you, tell me if it worked.
Attachments:
bipolar motor control.vi ‏20 KB

How do you controlling a stepper motor

I want to control a stepper that is lifting a scissors lift but I want to calibrate it to different height enter in the heights into memory and then recall when necessary.

Not sure if you were looking for electrical help or programming help. If you want more details you could reply to the thread....
You need a stepper motor controller. This is an electronic circuit. They can probably be found with a web search. The range in prices from $50 to $1000 or more. Or you can build one using componants from National Semiconductor or Allegro or Texas Instruments or other chip makers.
Depending on motor configuration, you can have a unipolar (6 wires, 3 wires per phase) or bipolar system (4 wires, 2 wires per phase). If you don't have instructions with your motor, you can figure out phasing with an ohmmeter.
Usually the controller has a square-wave input and a direction input. Sometimes some other inputs. Usually there is one step (or even one microstep, depending on the controller) per rising edge. Sometimes they have an analog speed input, but this kind of controller is probably not right for your application.
You can count steps in one direction. The stepper controller takes care of powering the windings to make the motor turn round. Then count steps back. Unless you have stalled the motor, the motor steps are very repeatable in location. If you remember how many steps from some reference point (i.e. all the way in one direction, say), you can save the position reference and come back to the location by counting up or down until your current position reference matched your saved reference.
Hope this helps some.

Using LabView, Arduino, and Easy-Driver to control a Stepper Motor

Hello fair folks of the LabView forums!
I am a humble engineering student in need of some advice and input on a project I am working on.
I’ve also done a fair amount of reading on the LabView forums with people trying to use LabView and Arduino to control stepper motors, and I’ve used as much information from each as I could. However the problem I'm encountering now is one which is unique to my VI Configuration.
So, here is what has been done thus far:
-Installed LabView Interface for Arduino [LIFA]
-Installed necessary VISA drivers for LabView to communicate with arduino
-Uploaded firmware to Arduino to allow it to communicate with LabView
-Properly wired Stepper Motor with Easy Driver and Power Supply; I have verified this by first using the Arduino independently of LabView, using example code found here.
-I have created a VI, and have just recently got it to run without reporting back any errors. While I suspect the behavior I’m encountering has to do with something inside the VI, it is difficult to determine as there are no errors being reported!
But here is general problem I am encountering:
-Connect Joystick to USB Port, connect Arduino to USB Port.
-Plug in outlet for Power Supply
-Open LabView VI
-Run LabView VI
-LabView successfully detects Joystick, and Arduino.
-Tilt Joystick; Stepper Motor moves in proper direction, but it only takes a single step. If held, it does not move further. If returned to zero, and then tilted, it again only takes a single step.
I know that in the example code, the Arduino issued the step command by writing the signal from LOW to HIGH, and varied the speed by how often it did this.
I assumed that the Write-PWM feature would do this same thing, but perhaps my assumption is wrong. I will continue to tinker with this myself, but I would be extremely grateful for any insight you might be able to lend.
I’m thinking, if not the Arduino Write-PMW feature perhaps a simple timing-sequence that could be used to alternate between writing 0 and 1, with the timescale of the sequence being scaled to the X-Axis from the Joystick. But, I am open to suggestions, and certainly appreciate any thoughts you may have to offer!
Attached to this is the VI used in this setup, a picture of said VI, as well as a rough sketch of the hardware configuration.
Thank you!
Attachments:
Arduino Stepper Control.vi ‏1224 KB
VI Picture.png ‏82 KB
Configuration Sketch.png ‏522 KB

Hi danjifraga,
I am not so familiar with the Arduino toolkit functions, but you may have better luck looking at the Arduino page at:
www.ni.com/arduino
I'll ask around on Monday to see if anyone is more familiar with the toolkit.
Good luck,
Brian
Brian G.

Control two stepper motors with PCI 7332 for sinusoidal movements

Hello,
I am now using two stepper motors of RK566BAE (Oriental motor). I connected those two motors with UMI-7764 and PCI-7332. I designed to have independent sinusoidal movement of each motor. The first motor is wired to Axis 1 and the second to Axis 2 (of UMI-7764).
I want to use Ni-Motion to create a single VI in LabVIEW which helps to control both motors. But I have not figured-out how to obtain the movement I desired.
Could you please advise me.
Thank you so much.

There are two ways to do elliptical arc moves:
Use contouring two download target position arrays to the onboard buffer
Use arc moves in combination with gearing (shipping example). This requires three axes.
The 7332 doesn't support contouring and gearing and it doesn't provide a third axis, so there is no way to use this board for this type of moves. The cheapest NI board that supports elliptical moves in contouring mode is the PCI-7342. As the second option requires three axes, at least a PCI-7344 is required for this method.
Here is a link to a feature comparison table for all NI 73xx motion control devices.
Kind regards,
Jochen Klier
National Instruments

How can I control my step motor

I am using a 6006-DB 3-mothor driver and a NEMA step motor model 405-SM, both from AMSI corp. I would like to control my step motor using LabVIEW. We use the LV. 5.1.1 version and we have a PCI-MIO-16E-40 as adquisition card.
The sistem I want to built is to control my step motor and while turning detect the intesity variation on a photodetector which is conected to my adquisition card.
I wonder if somebody has an idea how to do that.
Thank you in advance
Daniel Hernandez

Ok I understood, I can use my PCI-MIO-16E card to control my steper motor driver, I will try to do that. But, if I use a DB-25 connector, how can I use my PCI card??
I was thinking to use the parallel port, directly, to conect my steper motor driver.
I attache some VI someone passed me. (It use a Setbit.vi and out port.vi)
Attachments:
MoteurGOTO6007-DB.vi ‏81 KB
MoteurGOTO.vi ‏87 KB
Commande_moteur.vi ‏10 KB

Problem with the DIR pin out - can not reverse my stepper motor..!

Hi,
I'm in trouble with the DIR output. I use PXI 7350 and the 7764 board.
My motor never changes direction and the signal DIR stays at 0 volts even I create motor cycle through MAX (or through a Labview example).
Test I've already done:
- I try to change the drivers output to "open collector" instead of totem. Ten the DIR output stay at 5 volts even I use MAX motor cycles.
- I try differents AXIS with my 7350 same problem
- I test my power driver board controler and I can reverse the motor if I apply directly 5 volts on the DIRECTION PIN of this motor controller.
I'm gonna be nervous...
thanks for help !
-damien

Looks like you took a STEP in the right DIRECTION!
~~~~~~~~~~~~~~~~~~~~~~~~~~
"It’s the questions that drive us.”
~~~~~~~~~~~~~~~~~~~~~~~~~~

Can I control a stepper motor by a time varying velocity input?

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