October 2020
Intermediate to advanced
450 pages
15h 32m
English
Content preview from Electrotechnical Systems
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197Electric Machine and Electric Drive Simulation
During deceleration, IM sends energy in DC link, the diode bridge is cut-off, and
the capacitor voltage rises up to impermissible level. To avert this, the dynamic brak-
ing circuit is used, which consists of the resistor RDT and the switch.
DTC subsystem contains the direct torque controller. The reference values are the
required IM torque and the IM stator ux linkage. The reference value Ψ
sref
is equal
to the rated value up to ω
rate
and decreases inversely proportional when ω > ω
rate
.
The toque reference is either an output of SR (speed controller) or an external signal.
DTC contains 3 Rela
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