Application of TH103 in three-phase AC motor voltage and speed regulation system

Application in three-phase AC motor voltage regulation and speed regulation system: Figure 12-1 5 shows a schematic diagram of the principle of
TH103 used in a three-phase AC asynchronous motor voltage regulation and speed regulation system . In the figure
, the phase-shifted control voltage input by pin 6 of TH103 comes from a given integrator , which is used to realize soft
start and prevent
the impact , while pin 7 of TH103 is connected The overcurrent, overvoltage and overheating fault protection circuit
can quickly block the pulse once a fault occurs. The control part of the system
operates with a single DC power supply. The three-phase synchronization signal of TH103 comes from the synchronous transformer. It works
in the double narrow pulse train mode, so the volume of the pulse transformer can be made smaller.
Depending the capacity of the thyristor VT, -VT selected in the main circuit, the , this system can realize
AC voltage regulation and speed regulation of motors from tens of watts to thousands of kilowatts.