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no...it's not my problem. The problem is how do using the PIC16f877 to generate the PWM and control the 3-phase motor and how to configure it in such a way.
Cause this is my part of the final year project, my teammate construct the afpm motor, and i design to control the motor.
Actually i know some method to generate the PWM, but i dunno how to built the circuit and how is the controller look like. For example Using NI ELVIS prototype board(LabVIEW), PIC16F877/873, and DSP kit F2812.
can anyone teach me or give suggestion to me? plz...
u can design ur own circuit ... u use zero crossing circuit to get the pulse on zero crossing
then give these pulses into PIC controller then u can generate PWM out ... in this way u can control the speed
if u want to design feedback control tthen u can connect techco generator with ur 3phase motor and then give this analog out to ADC built in PIC controller
If you have to use that PIC you can try a AD7226 to generate a 3 phase signal, but it'll need to be amplified(good luck with that). In reality you are asking too much out of that little PIC. If you want a step by step. Go to microchip.com purchase the ACIM demo board and the motor and HV module that goes with it... it'll have a PIC 30F6010 hook it up to a motor and download the code into it... then you're done. I wouldn't try 3 phase control on anything less than a 18F452 and even then you're doing software PWM on one of the legs... I highly recommend the 30F6010. You'll need a driver like a IR2131 and a IGBT pack..
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