usb 6008 dc , stepper , servo motor

[khizer572]

i am new to labview. my questions are

1.can we use usb 6008 for servo, stepper ,dc motor speed control?

2.can we design PID controller for dc, stepper and servo motor to control the speed using labview?

[johnsold]

1. No, no, maybe.

2. Yes.

The USB-6008 has software timed outputs. This means that the outputs are too slwo and have too much timing jitter to be useful for servo or stepper motor control.  If your DC motor controller has an analog voltage input, the Anaolog Output of the 6008 could be used to drive it. You would need to check the voltage and current requirements of your controller to see if they are compatible.

There are PID VIs available, although I think they are in a toolkit which must be purchased separately.  You can certainly write your own using lower level functions which are in LabVIEW.

Lynn

[khizer572]

thanks for guiding.

now at this stage we move to PMDC motor and I want to make speed control of pmdc motor using PID controller and implenting on harware.
can i use usb 6008 or usb 6009? which is best suited? and i am very new to labview so can u guide me in understanding in labview?

[johnsold]

Both the USB-6008 and 6009 have software timed outputs, so there is no difference in their suitability for such applications. If your controller uses a voltage input and you do not require the speed to change very quickly, either one could be used.

Lynn

[khizer572]

Sir I want system identification of pmdc motor what steps I should follow and what extra things are needed?

[johnsold]

You should start by thinking about how you would do the system idenitfication manually. What kinds of measurements would you make? What kinds of calculations are required on those measurements?

Then consider what you want to do with the computerized system that you would do differently from the manual system. Will this be an autmated system for use by semi-skilled operators or a research tool for motor engineers? How many motors will be tested per unit time? What will be done with the results?

The answers to these and similar questions will guide you toward the design of the test system.

Lynn

[khizer572]

can usb 6008 daq card read from the speed measurement sensors which we would  attached with pmdc motors ?

and one more question is that do we need extra PID toolkit for controling the speed of motor or we simply designed the pid controller in the labview? and do we need extra system identification toolkit for motor?