when i simulate the model using simplified synchronous machine the output frequency is not proper. The parameters which i am supposed to use to get a frequency of 400Hz is N=6000(the input to the model is 628rad/s), pole pairs=4. when i give this parameter i don't get a freq of 400Hz, why is this? is there any other parameters that i have to change? if so please help me.
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The electrical frequency is, as stated in the comments:
f_elec = poles * f_mec / 2
I was wondering what you were doing, because I can't see where you get in trouble. In a synchronous machine, the output frequency is only a function of the number of poles, and the rotor frequency, nothing else.
Since I don't know how you achieved 0.153Hz, I asked to see your model, so that I could try to figure out where your error is.
Thus, the answer to your question: "Is there any other parameters that i have to change?" is No, nothing else must be changed.
Best of luck!
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