My latest EV project

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Joined: 03/01/2018
Location: Australia
Posts: 1033
Posted: 08:42am 23 Sep 2021      

  Revlac said  Later on as an experiment we lowered the field voltage using a resistance bank, the result was less power to start up, but the motor would rev out a LOT higher and was not held back anymore

We did this when I was at Uni back in the 90's. Played with a big DC motor. We would lower the field current to make it go faster & raise the field current to slow it down. Had to record & plot everything.

The reason being (if I remember correctly) is that with a lower field current, a lower back EMF is generated & the armature current rises, speeding up the machine, if possible to regain the equilibrium & vice versa.