Have a look at ebikes.ca , they have a setup that is basically a hub motor used like mid motor run at a higher voltage and RPM than it is normally used at, called the "strokemonkey". A 24V, 1kw motor used at 48V gives 2kw. There is a calculator on there that is very helpful. Verne Pavreel who has posted a few times Has a similar setup, one of the issues with ebike setups is that the quoted efficiency is the maximum, on a hill you are often getting 50% with common ebikes. A more powerful motor will do better on hills if run at the same power as the 50% ones, but then the efficiency at light load suffers. Running the motor through a transmission with gears that can be changed can help a lot to achieve high efficiency at both extremes at the expense of drive complexity and reliability. A 1kw ebike motor may draw 5A 48V at full speed lo load! While a Prius 40kw draws 1A... obviously much more effort has been put into making the Prius motor high efficiency. I have thought of using the Prius MG1 motor, the small 20kw one, in an ebike. What current does the Lynch motor draw running free at 48V? anyone know?
-----Original Message----- From: EV [mailto:ev-boun...@lists.evdl.org] On Behalf Of Lawrence Rhodes via EV Sent: 29 May, 2017 6:53 AM To: ev@lists.evdl.org; ev-requ...@lists.evdl.org Subject: [EVDL] Most efficient drive system for a bicycle/tricycle. I'm looking at options for my Terratrike. Mid vs hub seems to be the thing. Seems bike systems are only 80% efficient. Has any one had good success with efficiency as well as speed. I'm looking to top out at 30mph with a 20 inch wheel. Is voltage an issue? I'd like to keep it to 48vdc but I'm willing to go higher or lower if it is an advantage(money or performance). I will eventually have a shell with solar panels plus my 250 pound hunk O' fat. Lawrence Rhodes -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.evdl.org/private.cgi/ev-evdl.org/attachments/20170528/da9dcde9/attachment.htm> _______________________________________________ UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub http://lists.evdl.org/listinfo.cgi/ev-evdl.org Read EVAngel's EV News at http://evdl.org/evln/ Please discuss EV drag racing at NEDRA (http://groups.yahoo.com/group/NEDRA) _______________________________________________ UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub http://lists.evdl.org/listinfo.cgi/ev-evdl.org Read EVAngel's EV News at http://evdl.org/evln/ Please discuss EV drag racing at NEDRA (http://groups.yahoo.com/group/NEDRA)