pwm to control a dc motor with c.rio

[mariomoskis]

Hello, i am generating a pwm signal in labview to control a cd motor(Imax=200mA Vmax=3V) i am using ni9401 as digital output, the dual power operational amplifier has(output current=1A),the measure which i did for current and voltage and on the picture,and the picture is the next:

the problem is the next:

why am i measuring 1V in my motor, if my sourse is 3v for the AO?how could i get 3v in my dc motor and I=200mA

could somebody help me?

thanks

[Jorge_C]

Hi!

I think that the supply voltage that you are giving to the OpAmp is not enough. I have simulated the circuit with Multisim and a 741, and that's the first thing I saw. It will probably not work as expected yet, but once you have made the change, tell me the results.

Regards!!

[mariomoskis]

the problem is:

when i did it generating the PWM signal with a ci555 i had 3V in the output of my AO = input voltage V+

but when i do it generating the signal in compactrio,i have 2V in the output of my AO and my input voltageV+ =3V

but i can´t up the input voltage of my AO to get 3v in my motor,because if i have more than 3v ,my motor is recieving more than I=200mA and it is the limit,how could i get the 3V in the output of my AO, and don´t have more than I=200mA?