coulomb_carl wrote: sefs wrote:
coulomb_carl wrote:If you have motor torque, current, voltage and RPM PIDs you can calculate motor efficiency? Might be interesting to see how efficient the motor is in both power and regen. A bit confused since in your display showing regen the torque and RPM computes to 4.1kW but volts and amps are 6.2kW?
Good catch. I think RPM is off by x2. I could collect some data to get an idea of efficiency over different modes.
I wondered about the RPM. If it is indeed off by two then in your displays the powering motor efficiency would be about 96% and the pure regen braking motor efficiency would be about 76%. Eminently reasonable, I think. Would be interesting to see how high the motor efficiency can be while braking at various pedal efforts.
Keep in mind that there are about 0.2-0.4kW of 12V DC/DC converter load, as well as any HVAC loads, which may have been on at that time. In my new display, I have those individually called out as well.
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