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Estimation of transfer function

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Omar Khalifa
Omar Khalifa 2020-4-18
关闭： Ameer Hamza 2020-4-20
Hello,
I'm trying to control 220V 100 Watt "Band Heater" by creating PID controller to apply 160 degree celsius on load, So in order to set PID gains i need to determine Transfer Function of band heater, I applied 220V to the heater and record the output temperature (using thermocouple) in array and send the records to MATLAB, but there was a problem when i tried to estimate transfer function, MATLAB asks me Number of poles and Number of zeros, and i couldn't actually determine them, So my question is:
What could be the number of poles and zeros for this system (Band Heater)?
Thanks.

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