Sensor Measurment

[Tori_W]

SK0480:

It looks like this question was already answered here and it is best to not create duplicate content. Do
you have any more questions about configuring the ELVIS II in LabVIEW? Have a good day.


Tori W.
 

[SK0480]

Hi

I have a simple quadrature encoder...it has a resolution of about 16 pulse/revolution

and I have a stepper motor that has a resolution of 1.8 degrees per revolution.

since both of these devices have different resolution...what would be the most effective way of measuring position of the motor using this kind of encoder.

[Tori_W]

SK0480:

1.8 degrees per revolution for your motor? Do you mean a step angle of 1.8 degrees as mentioned here? If
so, there is not really a more "effective" method than just measuring your position as you normally would
taking into consideration how much resolution you are actually getting. It looks like johnsold already
calculated this on your other forum post:

"Do the math: 360 degrees per revolution/(1.8 degrees per step) = 200 steps per revolution >> 16 steps per revolution of your encoder.

Or 360 degrees per revolution/(16 steps per revolution) = 22.5 degrees per step.

 

With that encoder you CANNOT measure the position of the motor on a per step basis!!!

 

Approximately every 25 steps of the motor will produce 2 pulses on the encoder.  But because you cannot align the motor and encoder to switch at exactly the same point you might get a +/-1 pulse variation in the encoder switching points."


Tori W.