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

[carlds]

 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.

[johnsold]

You did not give enough information.

What do you mean by "using labeled?"

What is the rated voltage for the motor? "0-V" contains no information. Also, what is the rated current of the motor? The stall current is important, too, but sometimes is not specified on small motors.

Do you need to reverse the motor?

Lynn

[carlds]

Sorry about the lack of information. I deleted some letters by accident. Instead of "using labeled" it should read using labview and a NI 6008 daq. The rated voltage of the motor is 12V current 3.8A  (45.6W). I hope this helps and thank you for your initial response.

[carlds]

I forgot to add that I do not need to reverse the motor. Thanks again.

[johnsold]

Thank you for the additional information.

The USB-6008 cannot produce enough voltage or current to coontrol the motor directly. At slightly smaller current levels I have used an adjustable voltage regulator such as an LM317 to control motor speeds.  Several years ago a single package 5 A regulator was available but I think it has been discontinued. You could use an adjustable regulator with an external transistor to boost the current to the required level.  The applications notes published by the regulator manufacturers have example circuits.

If you do not have the expertise to build a circuit to do this, then you need to find a DC motor controller with an analog input.  An industrial supplier such as Grainger has such things.

Lynn