# Designing an Induction motor from AC-DC-AC, I am not sure what code to enter for the function block. I want to check the speed and torque response with the change of frequency

3 views (last 30 days)
WAQAS on 26 Jun 2024
Designing an AC-DC-AC induction motor so far I have:
AC source - rectifier - Inverter with the function block - Induction motor and - constant block (load). I want to check the speed and torque responce with the change of frequency.
I am not sure what code do I need to enter in the function block so that I can check the speed and toque responce with the change of frequency.
Regards

Manikanta Aditya on 1 Jul 2024
Hi,
As part of process design the AC design source and then use a diode bridge rectifier block to convert AC to DC.
• Then add a capacitor to smooth the DC voltage.
• Use a PWM inverter to convert DC back to AC with controllable frequency and voltage.
• Create a function block to control the inverter frequency and voltage.
• Configure an induction motor block with parameters like rated power, voltage, and frequency.
Here is an example workaround MATLAB code snippet for the function block that controls the frequency and voltage of the inverter:
function [Vout, Fout] = inverter_control(speed_ref, speed_actual)
% Parameters
Vbase = 230; % Base voltage in volts
Fbase = 50; % Base frequency in Hz
% Proportional controller for speed regulation
Kp = 1.0;
% Calculate the frequency error
freq_error = speed_ref - speed_actual;
% Adjust the output frequency based on the speed error
Fout = Fbase + Kp * freq_error;
% Limit the frequency within safe operating range
Fout = max(0, min(Fout, 2*Fbase));
% Adjust the output voltage proportionally to the frequency
Vout = Vbase * (Fout / Fbase);
end
I hope this helps!

### Categories

Find more on Specialized Power Systems in Help Center and File Exchange

R2024a

### Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!