;*******************************************************************************
;PROGRAM			:	V/F control of 3-Phase Induction Motor
;MICROCONTROLLER	:	PIC18Fxx31	
;*******************************************************************************
;*******************************************************************************
;AUTHOR		:	Jon Burroughs, 
;			:	based on V/f code by Padmaraja Yedamale
;			:	Microchip Technology Inc
;DATE		:	2/11/04
;Version	:	V1.0
;*******************************************************************************
;Description:
;
;This code implements V/f control of a three-phase induction motor using
;the PIC18F4431 Microcontroller.  This code accompanies the application note
;AN890 "3-Phase AC-Induction Motor Control Using the PIC18F4431"
;
;By varying the frequency of supply to the Induction motor we can control the 
;speed of the motor. But by varying only frequency, changes the flux
;also which results in changes in torque. So to keep the flux, hence
;torque, the magnitude of voltage applied also needs to be changed. Or in other
;words, the ratio of V/F needs to be kept constant throughout the
;operating range.
;
;*******************************************************************************
;                    Software License Agreement                       
;                                                                     
; The software supplied herewith by Microchip Technology              
; Incorporated (the "Company") for its PICmicro