Index exceeds the number of array elements (1) using transfer function

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Lucy Beksinska 2020-12-10

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https://ww2.mathworks.cn/matlabcentral/answers/689489-index-exceeds-the-number-of-array-elements-1-using-transfer-function

评论： Lucy Beksinska 2020-12-10

采纳的回答： Amir RF

在 MATLAB Online 中打开

I don't understand what is wrong, it's frustrating.

% set up motor with initial conditions and properties
motor.timeConstant = 0.65;   % [min]
motor.gain = 0.5;            % [rpm/V]
% transfer function for the motor
s = tf('s');
TFmotor_OL = motor.gain / (motor.timeConstant*s +1); 

ERROR message:

>> Tutorial3controllingplant

Index exceeds the number of array elements (1).

Error in Tutorial3controllingplant (line 6)

s = tf('s');

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采纳的回答

Amir RF 2020-12-10

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Dear Lucy,

I run your code and I did not get any errors. Your error may be in your earlier code line (where you define s).

Best,

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Amir RF 2020-12-10

在 MATLAB Online 中打开

You can replace

s = tf('s');
TFmotor_OL = motor.gain / (motor.timeConstant*s +1); 

with

TFmotor_OL = tf(motor.gain, [motor.timeConstant 1]);

This gives you the same result.

Best,

Lucy Beksinska 2020-12-10

Thank you for your help. I have also restarted the MATLAB app and the error has gone!

regards, lucy

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Physical Modeling Simscape Electrical Specialized Power Systems Motor Drives

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