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:[email protected]] On Behalf Of Lawrence Rhodes via EV
Sent: 29 May, 2017 6:53 AM
To: [email protected]; [email protected]
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
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