How to replace a part of an equation with another expression

Question:How to replace a part of an equation with another expression

Posted: pik1432 245 Product: Maple

June 18 2020

Hello all,

Would you tell me how to replace a part of an equation with another expression?

I tried to replace the expression '(1-Lm^2/(Ls*Lr))' in the equation below ('LD') with an expression 'sigma', but no success.

restart;

>	LD := Lambda_ds = (-Lm^2/Lr + Ls)i_ds + LmLambda_dr/Lr;

(1)

>	sigma := (1-Lm^2/(Ls*Lr));

(2)

>	algsubs(1-Lm^2/(Ls*Lr)=ss,LD);

(3)

>	subs({(1-Lm^2/(Ls*Lr)) = sigma}, (3));

(4)

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