Controlling a small motor

Hello everyone,
I have a small and probably dumb problem I cannot seem to find a solution
for: I need a PCI board to control a small 24V, 3.5W max motor used to
rotate a piezo transducer.
The kind of control I need over the motor is very basic (on/off and little
else), the only requisite is that it can be controlled via software
(preferably labview).
In the future the system will be upgraded to a stepper motor (for which I
found many PCI-based options), but for now we're stuck with this one.
Any suggestions would be greatly appreciated.
Thank you
Marcello Barboni

Hi Marcello,
You need a Metrabyte Compatible I/O Card. The PCL725
was the most famous version of it.
I have used the following card from CyberResearch with phenomenal success
CYPDISO8 8 Mechanical Relays, 8 Isolated Inputs Board
This is a PCI Card with 8 Relay Outputs, which can be individually controlled. They will Handle your Motor Ratings. Unfortunatley the Data Sheet can be Obtained by Fax-On-Demand Only.
If you are not bent on PCI interface, there is another ISA card that will do the job and it is even cheaper.. $150.00 max.
CYDO 24HV/48HV High-Voltage, Direct Drive Digital Output Boards. These will Handle directly 50V/0.5A load. With Motor make sure you include a Freewheel diode to curb the transients.
http://www.cyberresearch.com/fod/fod5315
.pdf
Check www.cyberresearch.com
The Only drawback is that you have to purcahse the drivers seperately for about $50.00. They do have ready LabView Drivers.
http://www.cyberresearch.com/fod/fod6021.pdf
Good Luck!!
Mache
Good Luck!
Mache

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I have it configured for voltage modulation, channel 0, and I am testing Ix0+ and Ix0-. To run it, I am right-clicking on the function and clicking "test". What's wrong?
thanks, Alex Millie
[email protected]

Ix0(+/-) are make the excitation current. You can see this in figure 4-1 in the user manual. You can see the output voltage from the MIO card by looking at the voltage from terminal 23 to terminal 20 (channel 0) and terminal 23 to terminal 21 (channel 1). You can see this pinout on page 3-5 of the SC-2042-RTD user manual.

Could someone tell me how to control a small dc motor by using labeled and a NI 6008 daq. The motor is adjustable by using a pot that ranges between 0-V if that is of any additional benefit

Could someone tell me how to control a small dc motor by using labeled and a NI 6008 daq. The motor is adjustable by using a pot that ranges between 0-V if that is of any additional benefit.

Read the second thread you have a link to. While both of these will produce PWM signals, the first one is a couple of orders of magnitude too slow to do anything useful in control the speed of a motor, what you would see would be the motor run at the full speed, then stop for a period, then run at full speed, rather than at the "average of on and off" as the Pulse Widths will be very long relative to the motor's response. The second one has a better chance, IF all you want to do is run the motor. If there is any other calculations ... Look at both and try and get an understanding of what they are doing. For PWM speed control of a motor you really need a pretty fast pulse width, and probably some filtering to smooth out the resulting "harsh" waveform, giving you the "average" voltage resulting from the PWM.
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Closed loop control of step motors possible with 7344?

Hi All
I have been looking around here for a while for an answer to this question.
For me, a closed loop control system is correcting for following errors all the time, also when the move is complete.
If the load on a system changes, there will often be a need for compensation in order to keep the position right. Then you need a closed loop control system.
I have made a system using DC motors with a 7342 controller. We are in the process og getting a new similar system, where the manufacturer chosed stepmotors in the believe that it can be used in closed loop.
Is it really true that the NI version of closed loop is only performing a what you call a "pull-in" at the end of the move in order to correct for lost steps or flexibility of the connection between motor and object/encoder?
I would call this "backlash compensation" or something like that.
Why dont you make a real closed loop option. The control voltage from your servo motor control, could be fed into a voltage-frequency converter with a matchin sign signal.
This shouldn't be too complicated to accomplish.
/b

You are right. NI motion control boards don't apply a control algorithm
during moves when configured in closed loop stepper mode. In this mode
the board monitors the following error during the move and generates an
error when the following error limit is exceeded and they start the
pull-in moves at the end of the move if necessary.
If you really want to do PID control with stepper motors you still
could connect an external V/f converter to the DAC outputs of the board
and control the axes like DC motor axes. Some vendors implement this
feature on their board but NI has decided not to do that as we don't
think that this approach provides a good solution. Here are some reasons:
The most important issue is the fact that you could easily exceed
the maximum rate of change of the motor frequency in the case that the
following error increases during the move. For a DC motor this would mean that the
voltage of the controller increases to compensate for this error and
the motor will follow - probably with some delay, but it will follow. For
the stepper this could mean that the acceleration becomes so high
that the motor stops immediately as it can't follow with a delay like a DC motor. What
should the controller do then? Restart the move automatically? Generate
an error? There is a big chance that you end up with a system moving in a stop and go mode.
The second issue is related to the control algorithm itself. The transfer function of a stepper motor is not really linear so it will be quite hard to find good tuning parameters. A DC motor can be tuned by analyzing the step response and the Bode plot. For the reasons that I have described in 1.) this won't work for a stepper so how should you tune it?
I have talked to some motion control engineers who have tried to control steppers with a PID algorithm and they all agree that this is a real pain and it's not recommended.
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Best regards,
Jochen Klier
National Instruments Germany

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
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How to control the step motor in this situation?

I have a PHI TRIFT3 ToF-SIMS instrument. The instrument comes with a default
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This is just sending the serial command via RS232C per command instruction I
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What should I do to accomplish the step motor control? Thanks a lot

Just to start from scratch, have you verified that you can do basic communication with your serial port, ie successfully perform a loopback test? Please let me know, and we will go from there.
Logan S.

How to control 2 epos motor using microcontroller 50/5

Hi. i've done a program from epos integrated to labVIEW to control 1 epos motor. i do the program by using the given epos sub-vi to labVIEW, but i only know how to do for controlling 1 motor. Anyone can help me or tell me how to control 2 motors or wad is needed?? thanks for your help :-D
Solved!
Go to Solution.

Hi Spydi,
up to now, I never did it with two EPOS. But you should first check your setup with the EPOS-Studio. You need to set two different Node ID`s and after this works from the EPOS-Studio <you should do two seperate lines of programming in LabVIEW. I attach some VI`s from maxon which are simple in using for one EPOS. I assume you just need to program them in parallel.
And you don`t need the CANopen Library, it`s possible to use but very difficult. The EPOS-Library from the download is a Set of VI`s which where developed by maxon in Switzerland and free of use, they use a Communication DLL behind. If you`re interested maxon develops a new release right now. If you want to use them instead of the one you already had, let me know, I can ask there for a BETA and place it here at the forum.
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Attachments:
EPOS Module.zip ‏77 KB

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I have 3840x2160, 24" display and many of the user interface controls are small, hard to read and in some cases are cut off.
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ArtJonak wrote:
I have 3840x2160, 24" display and many of the user interface controls are small, hard to read and in some cases are cut off.
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Control a servo motor thru labview.

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

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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.
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Accelerometer sense tilt then interface with USB-6008 and generate PWM to control M995 servo motor

hi everyone,
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Attachments:
FYP.vi ‏253 KB

currently i need to generate PWM to control servo motor model MG995. but i am facing problem in generating the PWM in between 800usec to 2200usec to control the rotation of the servo motor. is there any example for me to refer.
below is my VI that i have done to date.
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pwm.vi ‏128 KB

How can I control 3 stepper motor in same time?

I want to control 3 stepper motor and 30 electro-valves.
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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.
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I wonder if somebody has an idea how to do that.
Thank you in advance
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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

Amplifying the current of ni9264 for controlling a DC motor in both directions:

I want to control a DC motor in both directions by NI9264. The problem is the module can not provide enough current.
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p.s. It does not matter if I use one port with +/- 10v or two different ports for one mottor.
Thank you for your answers in advance.

Navid,
typically DC motors are not driven by a proportional current signal, but by a PWM signal which is provided by an H-bridge circuitry that allows bidirectional moves.
So you either could use an external power drive, that accepts a +/-10 V input signal from the NI 9264 or you could replace this module with an NI 9505, that has a powerful H-bridge circuitry built in in addtion to quadrature encoder inputs, which are typically required for a motion control application, too.
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Kind regards,
Jochen Klier
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Closed loop control of DC motor drive using PCI 6251

Hi
i am using NI PCI 6251 for closed loop control of dc drive.(shunt motor,220v, 0.5HP, 2.5A rated, 1500RPM)
the dc motor is fed from a bidirectional dc-dc converter. this converter works in boost mode(forword motoring) and buck mode(braking mode/battery charging)
the converter is built using mitsubishi IGBT module. at low voltage side of the converter a battery bank of 48V is connected and high voltage side the motor is connected.
An IR sensor is developed to measure the speed of the motor and a hall current sensor is used to sense the converter current.
in the control part i have an inner current control loop(PWM controller) and a outer speed control loop.both controllers are PI controller. To measure the speed i have used counter of the DAQ assistant, then frequency. then this frequency is converted to RPM using labview.after giving the speed and current signals to the controllers , then i started tunning the PI gain, but at the starting the duty cycles was 100%, so the IGBT got damaged immediately. now how to tune the controllers during the closed loop operation. the switching frequency of the converter is 20KHz.
can any body suggest me how to run the dc drive in closed loop ?
thanking you.

Hi Premenanda
The freq data receiverd from the daq assistant has the units of Hz, or in terms of motor speed, rps (rotations per second). I can see that you are trying to convert that to rpm (rotation per minute). which can be done by dividing the rps speed by 60. Instead, you are multiplying it by 60 and also comparing with 2000. the resultant multiplied value is displayed in your program only if it is smaller than 2000.which is causing the problem here.( as seen in file 'original code.png)
I have attached a file named 'modified code.png' that shows how the conversion from rps to rpm is done. Please do the required changes in your code and let me know if it works.
Attachments:
modified code.png ‏18 KB
Original code.png ‏15 KB

Controlling a small motor

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