5SHX10H6004 ABB Drive control thyristor module

Description

General
What is direct control?
Direct torque control – or DTC as it is called – is the very latest
AC drive technology developed by ABB and is set to replace
traditional PWM drives of the open- and closed-loop type in the
near future.
Why is it called direct torque control?
Direct torque control describes the way in which the control of
torque and speed are directly based on the electromagnetic state
of the motor, similar to a DC motor, but contrary to the way in
which traditional PWM drives use input frequency and voltage.
DTC is the first technology to control the “real” motor control
variables of torque and flux.
What is the advantage of this?
Because torque and flux are motor parameters that are being
directly controlled, there is no need for a modulator, as used in
PWM drives, to control the frequency and voltage. This, in effect,
cuts out the middle man and dramatically speeds up the response
of the drive to changes in required torque. DTC also provides
precise torque control without the need for a feedback device.
Why is there a need for another AC drive technology?
DTC is not just another AC drive technology. Industry is demanding more and existing drive technology cannot meet these
demands.
For example, industry wants:
– Better product quality which can be partly achieved with
improved speed accuracy and faster torque control.
– Less down time which means a drive that will not trip unnecessarily; a drive that is not complicated by expensive
feedback devices; and a drive which is not greatly affected
by interferences like harmonics and RFI.
– Fewer products. One drive capable of meeting all appliction
needs whether AC, DC or servo. That is a truly “universal”
drive.
– A comfortable working environment with a drive that produces much lower audible noise.