Figure 2. Equilibrium Point EP2 in phase planes (x1, x2) and (x3, x4)

From

Stability Margins and Low-Codimension Bifurcations of Indirect Filed Oriented Control of Induction Motor

Nizar Jabli, Hedi Khammari, Mohamed Faouzi Mimouni, Sultan Aljahdali

International Transaction of Electrical and Computer Engineers System. 2013, 1(1), 6-14 doi:10.12691/iteces-1-1-2