Maintain v/f ratio in pic microcontroller output

Hello,

I am using PIC18f4550. My aim is to control AC induction motor. For that I have generated required PWM pulses for required frequencies. But I need to maintain V/F ratio at the output. Which I am unable to do.

Please suggest me.

The PWM waveform requires generating a sine wave.
V/F control requires generating a sine of a different amplitude.
So, if your 50-Hz table goes from 0-1023-0 (frinstance), the 30Hz table will go from 0-511-0.

Thanks Wade.

Can you please explain in details ?