Single channel encoder signal to quadrature signal?

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1

I have a closed system with a DC motor and a single-channel incremental encoder for position feedback. I bought a controller that says it takes dual channel (quadrature) encoder input (channels A, B). I do not need the directional elements of the device (the reason for the 2nd channel), but would like to still find a way to interface the system with the controller. Is there a way I can emulate a quadrature signal by feeding the system signal through something to shift its phase 90 degrees? Is that even necessary?

Thanks!

2

Can you provide a link to the motor controller datasheet?

3

You can feed the signal to channel A and a delayed version to channel B. Delay can be
as simple as R, C and schmitt-trigger.

However that will give uneven spacing of the quadrature transitions except at one frequency, which isn't
ideal.

Its a nice little exercise in generating combinatorial logic, here's the truth table you want:

IN  A   B | Aout Bout
0   0   0 |  0    0
1   0   0 |  0    1
1   0   1 |  0    1
0   0   1 |  1    1
0   1   1 |  1    1
1   1   1 |  1    0
1   1   0 |  1    0
0   1   0 |  0    0