
21-26 Power Electronics and Motor Drives
Depending on how the switching sectors are selected, two dierent DTC schemes are possible. One, pro-
posed by Takahashi and Noguchi [23], operates with a circular stator ux vector path, and the second
one, proposed by Depenbrock [6], operates with a hexagonal stator ux vector path.
21.7.3 Switching Table-Based DTC: Circular Stator Flux Path
21.7.3.1 Basic Scheme
A block scheme of classical DTC (used by ABB Company [24]) is presented in Figure 21.23.
e stator ux magnitude, Ψ
sc
, and the motor torque, M
c
, are the command signals, which are com-
pared with the estimated Ψ
ˆ
s
and M
ˆ
e
values, respectively