$$\vecf = f_\alpha + j f_\beta = \frac23 \left( f_a + f_b e^j2\pi/3 + f_c e^j4\pi/3 \right)$$
Keywords for discovery: Space vector modulation, Clarke-Park transform, field-oriented control, AC drive modeling, permanent magnet synchronous motor control, induction machine state-space model, Oxford engineering monographs.
For the graduate student, owning this monograph is akin to a physicist owning Jackson’s Classical Electrodynamics —it becomes a constant reference, dog-eared and underlined. For the practicing engineer designing the next generation of EV traction drives or industrial servo systems, the space vector approach is the daily language of control; this book is the definitive grammar.