258 J. Espinoza
FIGURE 14.47 The ASD based on a VSI. Motoring to regenerative operating mode transition: (a) dc bus current; (b) ac line motor voltage; (c) ac
phase motor voltage; (d) motor line current and back emf; (e) shaft power.
FIGURE 14.48 The ASD based on a VSI. Burning resistor strategy.