Gday  All

Between series parallel K,camshaft and unit remote control and VVVF of
today, there is Chopper control.

Some questions.Were there some Chopper controls  with series,parallel
as the dwgs Ive seen have all the motors in series

Is the Thyristor a diode with a base that can have its resistance
changed by a 3rd wire input so it can conduct or not

What Oz trams and Sparks had Chopper control

Cheers,    Mick