[few2many]

Looking over my golf cart motor gave me an idea.
The speed controller is the horrible resistive wire set up. If you know how it works, skip ahead! Basically, The accelerator switch uses several wires and connection points along a resistive heated wire. The accelerator switch receives power from either the low voltage/ high resistive section for low speed and then the low resistive/high voltage section for higher speeds, and what looks like 4 other spots in between for medium speeds.

My idea is simple, my terminology may take some thought. It may or may not be feasible for a full on EV. Run youre PWM shaft off the traction motor itself, instead of a seperate motor! At the start of the brushed slider, use a resistive power section and relay to get the motor running, then , set it up so the pwm power level picks up a little lower than the resistive set up, as starting takes a bit more power. The frequency will change with motor speed, but you can set up the rotating pwm to have a good minimun frequency through multiple brushed contracts or gear reduction. Follow me so far, I'll try to get a pic in. It would also be possible to use a relay and resisive wire alone. this would just be fore starting, not cruising.

[Darxus]

This stuff sounds great, why did the thread die a year ago?

Did anybody every get further into implementation and testing than Woody's excellent video?


I was just pointed to this thread after posting about mechanical PWM.

[OHM]

Originally Posted by Darxus

This stuff sounds great, why did the thread die a year ago?

Most people are interested in patenting their ideas for commercial reasons as
development costs money / time that most tinkerers cant afford.

Im all for a cheap alternative to whats out there.