Quote:
Originally Posted by Old Tele man
I'm a retired EE and well aware that (typically) a series DC-motor produces it's greatest torque at zero-rpm, but that's not how parallel AC-motors work, so was wondering what your "design" goal was for changing gearing ratios.
Like I said, merely a curiosity question.
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I welcome questions and discussion. My formal education goes to 3 years of high school, but I do enjoy DIY EV discussion with EE types. This particular build is the result of what I learned from a couple earlier builds, plus a lot of studying of thermodynamics.
The goals of the gearing changes are to maintain the most efficiency, but also to offer better driving options. While the eco driving efficiency is astonishing, I also like to run the left lane and run it really hard. Changing the gearing won't change anything as far as efficiency goes, but it will cover a broader range of driving styles.
I have the throttle mapped with a time delay, but also progressively more power as the rpms rise. In my second conversion, I have 1200 amps and 144 volts available to my DC motor all at once, and it is really fun, but on this rig the throttle mapping is set up for a really easy to drive experience. I have an eco mode switch on the dash that allows me to reconfigure my power, regen, and throttle settings with a flip of a switch, so I can select between ultimate efficiency or performance. Since my HVDC circuit is only 115 volts, the five speed transmission with the 3.79 gearing will cover the narrower rpm band better for both types of driving.