Hi,

I want to develop a controlled acceleration for a series ac motor using Triac switching.
The switching is done by pulses given to the triac by microcontroller (AT89c8252) and I get the feedback through a rotory sensor(giving pulses) at the shaft.
When an inductive load is applied the pulses from rotory sensor decrease and I have to maintain the speed by increasing the ac voltage to the motor by increasing rms Voltage of the triac.
I have to use Assembly language for programming.

My question is:

1.How do you control the switching of the triac PTA16(600V)(controlling V-rms)using digital pulses by the uC?
2.How to give soft start to the motor using PID logic?
I have done the same thing using analog circuit but have not tried this giving digital pulses.
Please Help.

Nitin.