I need digital AC ammeter circuit please help to complete my project.
you may have already found what you were looking for on google by now, none the less I think I can help you. I do not have a circuit schematic but I worked on a similar project not too long ago. To monitor the current you can use 3 current transformers to clamp on the 3 phases. A current transformer is a transducer that will convert the current in the phase to a voltage output signal. The output signal will be low level AC so you will need to rectify and convert the signal to a steady DC signal. (this can be done very easily by using a single diode rectifier and a low pass filter, you may also require an amplifier) once all 3 current signals are converted to a steady DC voltage signal that is proportional to the line current, you run the signals into a PIC micro-controller and interface an LCD display to the micro-controller. You can then write simple code to convert the 3 analog input signals to the proper RMS current values and then output it to the LCD. Hope this helps.
I guess that is what you are looking for. There isnt one ammeter per motor, there is one on each phase, or a selector switch to change between phases.
