Differentiation, Minima and Maxima
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I want to differentiate the following loop for an induction motor with respect to (s) and find the minima and maxima:
for ii = 1:51
t_ind1(ii) = (3 * v_th^2 * r2 / s(ii)) / ...
(w_sync * ((r_th + r2/s(ii))^2 + (x_th + x2)^2) );
end
Which is the best method/approach to achieve this?
Frank
1 Commento
Basil C.
il 19 Feb 2018
I guess this equation for calculating the Torque produced by an induction motor where s is the slip percentage. But why are you using s(ii), is it an array? If so, then how do you plan on differentiating it??
Risposte (1)
Walter Roberson
il 19 Feb 2018
[max_t_ind1, idx_max_t_ind1] = max(t_ind1);
[min_t_ind1, idx_min_t_ind1] = min(t_ind1);
s_max_t_ind1 = s(idx_max_t_ind1);
s_min_t_ind1 = s(idx_min_t_ind1);
Assuming, that is, that there is only one minimum and one maximum. If there could be multiple, either use findpeaks() or else look for sign changes in diff(t_ind1)
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