The thyratron was a form of an electrical switch that was not reliable and had noticeably large dead times or transport lag. The static amplifier has been used extensively in industrial servo drives. The magnetic amplifier was highly reliable and rugged but was also very slow in response. The silicon controlled rectifier (SCR) is the solid-state version of the thyratron.
The SCR is highly reliable and is available in very large current ratings. It has been used extensively in industrial servo drives, both for speed and positioning or feed drives. Like the thyratron, the SCR has a dead time where no current flows. This dead time is described as transport lag causing amplifier phase lag and limiting the DC SCR drive to low servo response.
Maximum torque ratings are about 400% of rated, which can be used for forcing (acceleration).
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