6
.
The most important regulation functions a
LCI drive system are the feedback and forward
control. The
angel adjusted function current and
speed such ensure correct commutation
of the inverter. The voltage controller provides
the excitation current controller with the set
point value needs attain and maintain
the required voltage the motor terminals.
B angle control
B angle control (3) forward control
function which determines the instant firing
of the thyristors the machine converter.
Voltage controller
The voltage controller (4) and the current
controller (5) also form conventional cascade
feedback circuit. may assumed that the torque
developed the motor approximately
proportional the motor current, flux and
power factor.
The ability ride through
short supply interruptions is
one the most important
features MEGADRIVE-LCI
Usually, your process just carries
on without noticing anything.
Basically, the motor voltage adjusted in
proportion the motor speed which is
equivalent maintaining the motor flux its
rated value. They act the supply converter
(rectifier), the machine converter (inverter)
and the excitation system. The current controller (5) adjusts
the current the brushless exciter varying
its stator voltage via three-phase controller.
Speed controller
The speed controller (1) and the current
controller (2) form conventional cascade
feedback circuit. The speed controller provides
the current controller with the set-point value
necessary attain and maintain the required
speed. Communication with other
units the drive and with any higher level
control system remote control centres
takes place via corresponding interfaces
controlling either parallel fast serial links.Closed-loop control
MEGADRIVE-LCI
Closed-loop control functions
Communication and interfaces
The programmable high-speed controller
communicates with the other control
system modules via parallel bus capable
of transferring the control function data at
the required rate. Thus the current controller
indirectly adjusts the torque exerted the
shaft the motor varying the voltage
at the output the line converter
