Maximizing Range for the Stark Varg

[Johnny Depp]

Ho fatto qualche ricerca e effettivamente ad alti giri il rendimento dei motori elettrici a magneti permanenti è più basso. Proverò anche io un rapporto 15/42

translated: "I did some research and indeed at high RPMs the efficiency of permanent magnet electric motors is lower. I'll also try a 15/42 ratio".

 

[brongle]

I did a bunch of research on this when I was exploring the inverter/motor parameters the VCU exports. I am very much a novice in this area, but the points that stuck with me are:

• Electric motors have a much wider range of performance properties than you might assume. Even small changes in the make-up of an electric motor can drastically change its efficiency band, performance, etc.
• Most people that talk about this stuff are looking at motor performance in isolation. The inverter (or controller) performance and losses are also important when considering overall efficiency and power use.
• On my EX swapping to 15/44 was a significant enough change in range performance (for my pure street use, on supermotos, etc disclaimers) that I noticed it for a few days after. My rough estimates based on Svag telemetry recordings was 5% more range from that change. I cruise a lot in 40+ so this makes sense given the next point.
• I think field weakening is indeed the larger factor to range when considering gearing. I'm not sure if the Stark controller is inefficient, if it's just the way the "tune" works, or what, but my EX loves to dump field weakening in even at lower RPMs. Based on the ratio between ID/IQ my guess was the Stark motor efficiency band is somewhere around 6-9k RPM, and likely a 200-500 RPM range sweet spot.

Indeed as others mentioned the best cure to range is a light throttle hand and cruising under 30 (probably more about wind resistance than motor performance, but still), I'm always amazed at how far I can stretch 1-2%, and conversely how quickly I can burn 80%