system ID

[yahia makableh]

I am working on Modeling a cruise controller system ( which is a DC motor), I want to perform step response and frequency response for it to find the transfer function, I have a data acquisition card with LabView, I want to know how to send a signal from labview to the motor and to record the output in order to find the transfer function of it ?.

Ex: to send a voltage signal to the motor: V(t) = 5 + 0.5sine(wt) V

if its possile to get the naswer sent to ym00065@georgiasouthern.edu

[cancancanopen]

Well what kind of communication port you have at motor side? I am not sure about DC motoer but, some stepper motors have RS 232 interface to communicate with PC and proper command set ,

If you have any communication port and proper command set for that perticular motor you can develop some test program.

[johnsold]

You could generate a voltage signal of the form you describe with LV and the DAQ device.  Run that through an amplifier to boost the signal to the power level required for the motor. (The DAQ card cannot drive the motor directly).

Do you have a tachometer to measure the motor response?

Lynn