Forum Discussion
BenK
Mar 06, 2014Explorer
Me Again wrote:
snip....
Well to correctly state it, electric motor have max torque(100%)at start up from zero RPM and less after that. There is nothing to create torque multiplication! Max is 100% and everything after that is less. There are drive system considerations that will have to be handled. Driving in low traction situations will need a complex computer torque management system.
Chris
Electrics should have 100% torque throughout it's RPM range...from Zero RPM to specified max RPM
As for the higher torque than spec...it depends on the controller. Good to great controllers
can over drive to attain +300% torque...but the down side is thermal and the reduced
duty cycle
That great controller will have regenerative braking and understand coasting to several
levels of braking. That also depends on the battery or storage device's ability to
absorb (recharge rate). Why many will have resistive disapation to suppliment the
storage device's recharge for high rates of regenerative braking
Your comments/thoughts/thinking is common and is from ICE's, gear multiplication
and hydraulic multiplication (TC). Had the same issues with the two large OEMs engineers
when consulting on the, then, next gen hybrid SUV
Terminated that contract when I realized that there were not going to use my teams
stuff and just cramming knowledge from my engineers. Mostly regenerative stuff.
Plus when their marketing folks laughed at my suggestion to put in a charge cord
as my controller system could recharge with little changes...they said their customers
don't want a charge cord....guess what...most all hybrids now come with a charge cord...
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