72,000 eRPM? Might that be just the thing to fine tune Bafang rpm pedal assist, for people who prefer a slower cadence? Trousers would catch fire through air friction pedalling at 72,000 rpm.
endless-sphere.com
The electric kit Peel P50 with that motor would go like a stabbed rat
Bit dramatic SWPhaserunner - Grin Products - Product Info
The Phaserunner was our first major controller partnership with ASI to bring their high performance field-oriented controller platform into a form factor and connector standard that worked well with ebike systems. It can support up to 72V nominal batteries and works well with systems running...ebikes.ca
that can do 45A non stop but the batt might explode or the motor core might go supernova and demagnetize it and burn out the windings.
Yes, I recently fitted a 36v 500w BBS02b controller to my 250w BBS01b motor. Previously the 2016 controller was locked to 15a current, increasing current just threw up an error message. The factory setting of the replacement controller was 24a so I reduced it to 20a and everything works fine. I wouldn't raise it higher, the BBS01 stator is about 20% narrower than the BBS02 and reportedly reaches heat saturation at around 800w.
Thanks for this post, which has me quite suddenly thinking of trying the same, even though I don't actually need more than 15A - my bbs01b controller from greenbikekit accepted 20A as a firmware setting when I tried it temporarily, but I don't recall if I actually disconnected the programming cable to connect the controller to the display, and switched it on and powered up the motor; I'll follow through next time I need to change a firmware setting. What performance improvements have you experienced? Does your motor get noticeably hotter? Does your battery cope? I do hope you'll post regarding problems, should you encounter any.
www.aliexpress.com
My BBS01b replaces a BBS01a I ran at 18a for 6 years before it expired earlier this summer. Performance at 20a is slightly improved as you might expect, but not enough so you would notice. The main difference may be something to do with the BBS02b controller settings but I can now pedal under power after using the throttle, whereas before on my BBS01a if I used the throttle it would override the PAS and there would be a delay when I resumed pedalling, that delay is now gone. I have a 36v EM3EV super shark battery with Panasonic GA cells with the BMS rated at 25a continuous, 30a max burst current, so at 20a it's drawing power within normal operating limits. The Battery BMS is programmed to trip if cell temperatures reach 60degC during discharge but I haven't yet had it cut out on my commute home, I have a steep climb uphill from a river I cross, by the time I reach the top the motor is warm to touch, I don't have a thermostat in the motor but it doesn't feel hotter than the old motor. I don't plan to raise current above 20a, any more will just generate excess heat that will cook the controller.
That does sound like a good safety feature - does your battery resume operation after cooling down, or some time period, or do you have to manually reset the BMS?
Do EM3EV sell from the UK? Or is it a matter of having to wait for the slow boat from China, with the associated import taxes and fees?
I wasn't charged import fees for the controller I bought from greenbikekit.com - they've got some way of getting them through without incurring charges. I don't know how they do it, the controller was repackaged and remailed to me, after being delivered somewhere else in the UK. Maybe a chap regularly ferrets orders through as personal items on flights? Or maybe they're strapped around his person, a bbs01b controller mule?i have never paid any import duty for stuff from china but they wont be able to put a batt that size on a plane.
last thing i got that was £270 +pp fee to convert it to dollars
Sounds to me like a lot of Googling for battery graphs is on order, to identify this mystery cell. Thankfully, I have about two years before I'll need one, although it'd be handy to have a spare battery sooner for longer journeys I keep talking about, but never get around to commencing.
www.fogstar.co.uk
