When I was working for Clark fork Lifts in the late 60s they didnt have
controllers as we have today, They used a set of Caps, High voltage rectifiers
and Xfrmers , The Xfmers /caps could go as high as 300 volts on a 48 volt
battery system, there was 4 large contactors , one was reversing, one was for
field weakening , They had what was a very rudimentary "controller" only about
5 or 6 resistors a few diodes and some small caps , this went to the "gas
peddle" the large Recs could handle over 1,000 amps . The earliest electric
fork lift I worked on was from the early 40s, It had a "gear shift" lever that
hit 3 different resistors, "large" for different speeds, and one reversing
contactor,, simple and it was still in use way back when I had to rebuild the
motor,,,, brushes and clean the Com + springs , thats all it needed
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