Brushless DC motor control using NI PCI 6251

am doing my project Speed control of a sensored Brushless DC motor. am using NI pCI 6251 daq. now my motor is running.but i dont know how to calculate the speed. in BLDC motor, hall sensor is attached. can you send me the sample program for calculating the speed and to give as a feedbackk

Will you please sent me VI model of BLDC ?
my mail id: [email protected]

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Problem in edge separation measurement by using NI PCI 6251 card

I am trying to measure time delay between two TTL pulses (rising edge of the first signal and falling edge of 2nd signal) generated by two Photo detectors (APD) . These pulses are random pulses. Pulse width is 20ns and height is 2.5 volt at 50 ohm termination. I am using NI PCI 6251 card (M series card) for this job. I have attached my program and DAQ assist settings using for this job to this mail. Problem is   6251 card couldn't detect the pulses from APD. Exactly error shown is
                                                         "Error 200474: specified operation did not complete because the specified timeout expired".
I have tried by increasing the waiting time but it didn't solve the problem. I have tested my program with 20ns pulse width TTL pulses which are generated by a function generator, in this case my program worked well and given expected result.[both the signals are from same function generator and they are synchronized so edge separation measurement gives width of the pulse ] The height (voltage) of the TTL pulse generated by the function generator is 4v at 50 ohm termination. Is this height difference creating the problem? What can be the reason ? Can anyone suggest a better way to do this job.
                                                                                 Thanks in advance
                                                                                                                                                                                                                      Regards
                                                                                                                                                                                                                       surya
Research student
Attachments:
daqassist.jpg ‏71 KB
edgeseparatio.jpg ‏26 KB

Hey JmBone,
It's possible that you are just suppose to send a 32-bit integer to control the 32 valves. The 'byte offset' is probably just there to allow grouping of 8 valves (8 bits as 1 byte). So instead of sending an 8-bit number with some offset, you just send a 32-bit number and only change the bits corresponding to the valves you want to change. It would be easiest to just have a 32-bit binary array in your code for changine the individual valves and then cast that to a U32 integer before sending it to the Set Attributes VI. Maybe I am misunderstanding the manual, but I don't think 'byte offset' is a parameter you are suppose to specify, and is just there to indicate how the valves can be bundled into a single 32-bit value.
Regards,
Ryan

I'm working on DC Motor control using DAQ. There is sufficient voltage output from DAQ but not current. What should i do so as to drive the motor

I'm working on DC Motor control using DAQ. There is sufficient voltage output from DAQ but not current. What should i do so as to drive the motor. Could you suggest me appropriate driver IC using which this problem can be solved.
Saravanan.T

You really should use a DC motor controller to control a DC motor, look at the 754410 IC for a good example. You should be able to interface these to most DAQ devices.
Alan

Dc motor control using myDAQ

Hi,
I'm building a DC motor control using myDAQ i have run into a couple of problem with the STOP button and the Max en Min speed. For some reason the waveform chart goes crazy i'm going to attach my the VI file.
Project description:
-An engine-ON-engine-OFF button
-A control for faster / slower
-A switch for left / right
-A button once maximum speed (100)
-A button once minimum speed (10)
-An indicator of the instantaneous speed (0 - stop, 100 maximum)
-An indicator for the direction
Could anybody tell me why it happens and how to solve the problem?
Thank you very much!
Best,
Istrael
Solved!
Go to Solution.
Attachments:
pulsgenerate Folder.zip ‏30 KB

Hi iounathing i appreciate the reply it works better now i have fixed the start button issue and the crazy waveform chart.
I think i'm missing something after falling edge and rising edge (if statement?) because when i turn the speedmeter to "0" or "100" the waveform chart keep sending low an high pulse. I wan't a high steady pulse by "100" and low steady pulse by "0" and in between low / high pulse.
Regards
Sorry for my bad english i'm from Aruba.
Attachments:
pulsgenerate Folder.zip ‏60 KB

Brushless dc motor control

I am using a brushless Dc motor 3 phase.. im confused on the six phase and the three phase. I am assuming the other three phases are for when it is high and when the state is low.. such like phase A high and phase A low.. I am using a VI that works with my hall sensors but the motor is twitching forward then twitching backwards.. what could be the reason for this I have attached the code.
Attachments:
6-phase control.zip ‏57 KB

I don't know much about the details of the low-level motor control signals, but I thought it might help if I showed you a couple links.
Here is some example code provided by someone who apparently created an RT-FPGA 6-phase Brushless DC motor controller. https://decibel.ni.com/content/docs/DOC-2424
Also, here is a link to an external website that describes the differences between 3-phase and Trapezoidal (6-phase) Brushed DC motors: http://www.motion-designs.com/images/DTrends_May_2008.pdf
Good luck!
Jeremy P.
Applications Engineer
National Instruments

Communication with motor control using RS-232

I need to use labview to communication with a stepper motor drive using the serial port RS-232. Could someone please get me started I'm not sure if a should use VISA or instrument I/O. And if I use one of those, how would I set it up?

Hi Phil,
Outside of LabView, how do you communicate with or control the motor drive? If you are able to use software like HyperTerminal or Procomm, then using the VISA serial communication tools will be the simple way of implementing your solution.
Here are some links which may provide clues on how to proceed. You can also do a search on VISA Serial communication.
Happy wiring!!
JLV
LINKS:
Link 1: Although this one talks about an error, it does provide instructions on how to setup the VISA session:
http://forums.ni.com/ni/board/message?board.id=170&message.id=99660&query.id=0#M99660
Link 2: Here are some examples: (good starting point):
http://forums.ni.com/ni/board/message?board.id=170&message.id=65873&query.id=0#M65873
Link 3: more info:
http://forums.ni.com/ni/board/message?board.id=170&message.id=86971&query.id=0#M86971

FPGA programming for motor control using free downloadable IP cores for PWM and Quadrature encoder interfacing

Hi,
I have a cRIO-9014 with a NI9505 DC brushed servo drive module, and I would like to program the FPGA for PWM and Quadrature encoder interfacing using the intellectual property IP functions mentioned in the "CompactRIO Motor Control Basics Tutorial":
Quadrature Encoder dX Method (FPGA, Use in SCTL).vi
Pulse Width Modulation (FPGA, Use in SCTL).vi
I made a search at ni.com/ipnet but I couldn't find them.
Where can I find free downloadable IP cores for PWM and encoder blocks to include them in my FPGA interface program?
Thanking you in advance,
Manuel
Solved!
Go to Solution.

Found by myself (google search!) at:
https://lumen.ni.com/nicif/us/codepowelecguide/content.xhtml

CRIO motor control using AMC Drive

Hi
I am trying to setup a simple DC motor control system with cRIO-9081, NI 9401 and AMC PWM servo drive 12A8. Can someone please tell me if this AMC drive is compatible with my other NI products? Do I need anything else to setup a simple closed loop speed control for a small DC motor? Any advice or example is very much appreciated.
Thanks

Hi SunnyX,
It seems like your servo drive is expecting an input of +/-10V analog. Are you able to confirm this in the device manual? If that is correct, you will not be able to generate the necessary signal with the 9401. You will need another module that you can program to output this signal such as the 9263.
You could also consider using the modules designed specifically for motion control and the SoftMotion Module to simplify the motion control programming. Please let me know if you have any additional questions or comments! Thanks.
Regards,
Kira T

Aquiring a signal using a PCI 6251

Hello,
I am trying to write a program that aquires a signal from a device connected to a PCI 6251. The device attached to the PCI is an esophageal lead and it is suppose to read a sine wave being sent through the body. Then I want to filter the signal and send it to a buffer. I do not have a good programming background, and I do not know if I can use LabView Signal Express or a function with in LabView 8.2 to aquire the signal. Any suggestions as to what I should do? Thank you.

Hi yed1920,
There are a few ways to acquire the sine wave. You can use a single DAQmx Acquire Step in LabVIEW SignalExpress and this will allow you to configure the acquistion and view the incoming data. You can check out some examples using DAQmx in LabVIEW SignalExpress which are found at C:\Program Files\National Instruments\SignalExpress\Examples\DAQmx on a Windows system. The LabVIEW SignalExpress Help and the LabVIEW SignalExpress Getting Started Guide which are installed with the program may also give you some direction.
If you choose to use LabVIEW, there are examples which can help you get started. The Example Finder can be accessed through the Help menu. The DAQmx examples can be found browsing by task under Hardware Input and Output » DAQmx. You can check out the NI-DAQmx Help file or the articles found on this page to learn more about certain functions in detail.
Regards,
Kent
Applications Engineer
Digital Multimeter Home

A/C three Phase motor control using 1/4 bridge Load Cell output and a USB 9172 Daq

NI Assistant,
I am tasked with setting up a Motion Control using two each OMEGA LC712-100K, -50K and -10K load cells to monitor the cable tension on six A/C motor driven winches. I also need to Monitor and calculate a Moment as well as the load slope for Load verses Time.
I have zero time to develop and I have searched your databases for existing Motor Controls to modify.
Should I use Case Structures and then place them in a while loop?
I setup a drawing in Word to visually define the task.
Signed,
Patrick Murphy
Attachments:
Layout for Testing Spars.docx ‏15 KB

Hi Patrick,
The reason why the Motion Control examples will not work for you is beacuse they are meant to be used with the NI Motion boards. Since you are using DAQ boards, the examples are probably not going to be able to help you too much. However, there is one example on the community that might be a place for you to start.
pmurphy wrote: Should I use Case Structures and then place them in a while loop?
What exactly do you mean by this? What do you want in the case structure or while loop?

Servo motor control using CRIO+FPGA and 9477 digital out module

Hello experts,
I have a futaba BLS551 brushless motor digital servo (3 wires-+,-, signal). i also have a CRIO+real-time+fpga and 9477 digital out module. how can i generate servo signals using this module
please help...
Thanks,

freemason,
In order to control your servo motor with the FPGA and or DIO module you will have to write drivers to control your motor and drive. While this is possible is an extremely complicated and time consuming process. I would highly recommend you consider using the NI 9514 with soft motion as it will provide full servo functionality and is relatively easy to use.
Regards,
Sam K
Applications Engineer
National Instruments

Help me in my mini project about dc motor control using labview

hi,
actually the idea is that using pid controller in labview.. controlling motor.i.e giving a setpoint to pid... n checking whether motor is running accordinly using a sensor.. i.e feedback n/w... i dnt knw hw to proceed.. can u help me with the circuit diagram

Hi swats,
"i dnt knw hw to proceed.."
I suppose you mean "I don't know how to proceed..", something is wrong with your "o" key
I would suggest going to the library of your school or university and get a book on basics of electric devices. There you will find a lot of hints on how to measure speed of motors and how they work. In fact your question covers several seminar hours in "Electrical Measurements" course at university...
Best regards,
GerdW
CLAD, using 2009SP1 + LV2011SP1 + LV2014SP1 on WinXP+Win7+cRIO
Kudos are welcome

EMG based DC motor control using labview

I have a project where i need to use my EMG data to control DC motor
using labview.I've already got the EMG signal by using ADinstrument and
import the signal to labview. The problem is i don't know how to connect
the signal with DC motor. This motor will start to move when it detect
the signal exceed certain value and stop when it less that value. I'm
still new with labview and i'm using labview 8.0. Can someone help
me?thanx

Please check out our Biomedical User Group - there are similar project discussions going on there and links to the NI Biomedical Starter Kit - a free download for doing biomedical data acquisition, signal processing, and other tasks.
Steve
Visit the NI Biomedical User Group at:
www.ni.com/biomedusers

Motor control using labview

I'm new to Labview. I just installed a new labview system with analog output.
What electrical component do I need so that I can power a decent size motor with labview output? The signal from Labview is only enough to power a tiny motor. Well, the only thing I know is to amplify its voltage using opamp, which doesn't do much since I need to increase its power.
I don't have good electrical background, but I'm trying my best to learn.....
Please help experts.

MrCoolMan-
This depends on several things. I have a few questions about your application:
1. What National Instruments Hardware are you using to control your motor?
2. Are you using a Stepper or Servo Motor?
3. How much power does your motor require?
4. How are you planning on controlling your system?
5. Does your motor require an analog or digital signal?
The answers to these questions will be a good way to get started with your application.
Regards,
Mike S
NI AE

Motor control using pwm,pid

Hi all,
Can anyone help with this please.
I have a counting circuit from a hall effect sensor and am controlling a motor using a PWM.I am controlling the speed of the motor varying the duty cycle and the motor is wired via solid state relay.these run fine.
What i am trying to do now is connect through a pid as to control the speed of the motor.
My understaning is that the set point is from the duty cycle, the process variable is the feed back from the sensor (rev per min) and the output is back to the motor to increase or decrease speed.
Is this the correct understanding? and if so can you help with setting up.
Attached is my vi.
Regards Anthony
Attachments:
rev per min 5.vi ‏117 KB

Continued from here: http://forums.ni.com/t5/LabVIEW/Error-200290-when-running-a-pulse-count-and-pwm-program-together/m-p...
Please look at what I wrote there. You need only one loop. The PID and Counter Write functions should all be inside that same loop, along with the measurement. The PID will do nothing useful outside a loop.

Brushless DC motor control using NI PCI 6251

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