Search found 216 matches

by jbond
Oct 29, 2016 5:08 pm
Forum: E-Bike General Discussion
Topic: Rear hub motor choice
Replies: 8
Views: 732

Re: Rear hub motor choice

No question. Just clarification of where I was coming from with the original query. And thanks for your input. It does sound like the Q100 is going to do the job.
by jbond
Oct 29, 2016 10:07 am
Forum: E-Bike General Discussion
Topic: Rear hub motor choice
Replies: 8
Views: 732

Re: Rear hub motor choice

My current ride is an Alien Aurora with a 36v350w BPM and a 36v15AHr LiNMC rack battery. I'm trying to put a bike together with about the same performance but lighter and neater with a better basic bicycle. The Aurora is a rigid MTB style, 26" wheels but low quality. I'm in the UK.
by jbond
Oct 29, 2016 2:21 am
Forum: E-Bike General Discussion
Topic: Rear hub motor choice
Replies: 8
Views: 732

Rear hub motor choice

Decisions. Decisons. Which would make a better base for a stealth 48v-15A rear drive motor on a bike with mechanical 160mm disks and Shimano Acera 9sp rear mech? The Cute/QBK 10 CST using the existing 9 speed cassette, or the Bafang/8Fun SWXH with a DND 9sp freewheel. The Cute has a LHS cable exit w...
by jbond
Aug 19, 2012 5:41 am
Forum: E-Bike Reviews & Testing
Topic: BMSBattery/ECityPower Experience
Replies: 391
Views: 11955

Re: BMS Battery - what a complete shambles of a company

If not BMS, then who? Is there a reliable and sensibly priced alternative for things like Bafang hubs either in Europe or that ships reliably to Europe?
by jbond
Feb 22, 2012 12:06 pm
Forum: E-Bike General Discussion
Topic: Bafang Bpm, how many RPM?
Replies: 123
Views: 30030

Re: Bafang Bpm, how many RPM?

Another data point. I have a BPM marked 36v350w 26(11) which I take to be a code 11 designed for a 26" wheel. I've measured a no-load speed of 23.5mph (cycle computer calibrated against GPS). Typical flat out top speed is about ~20mph. Working all that back gives a no load rpm of 308 on a nominal 36...
by jbond
Jul 03, 2011 3:30 am
Forum: E-Bike Non-hub Motor Drives
Topic: Commuter Booster - <1kg Friction Drive
Replies: 1342
Views: 202033

Re: Commuter Booster - <1kg Friction Drive

The temptation to keep the code to yourself is going to be strong. But I'd really urge you to think carefully about open sourcing the code and what that would mean. I haven't done the research, but I don't see any problem with the legality of selling a packaged hardware-software solution that is leg...
by jbond
Jun 21, 2011 3:19 am
Forum: E-Bike General Discussion
Topic: Bafang 393RPM Hill Capability
Replies: 25
Views: 1802

Re: Bafang 393RPM Hill Capability

Some real world experience. I've got a packaged bike that uses the sensorless BPM 36v350w 26"(11) motor, with 36v-10AHr of Phylion LiMnO2 battery and an LSDSZ controller marked as 9A continuous, 18A peak. Noload speed is 24mph. Real world flat speed is 20mph. The worst off road hill I could throw at...
by jbond
Jun 20, 2011 4:55 am
Forum: E-Bike Non-hub Motor Drives
Topic: Commuter Booster - <1kg Friction Drive
Replies: 1342
Views: 202033

Re: Commuter Booster - <1kg Friction Drive

No plan on phase current limiting. The current sensor I selected is not suited to this task, and I don't understand the value of doing it. What is the advantage? As I understand it, two things break controller FETs. Too much current at 100% PWM, and current spikes at low rpm, mid-throttle, mid-PWM....
by jbond
Jun 20, 2011 2:28 am
Forum: E-Bike Non-hub Motor Drives
Topic: Commuter Booster - <1kg Friction Drive
Replies: 1342
Views: 202033

Re: Commuter Booster - <1kg Friction Drive

Are going to try to limit phase currents as well as battery current and do you think you might need to? As I understand it the Infineon controllers don't directly limit phase current, but calculate what the phase current would probably be based on PWM, motor speed and battery current. This is then c...
by jbond
Jun 01, 2011 2:06 am
Forum: E-Scooter and Motorcycle General Discussion
Topic: MotoCzysz NICE E-motor sound!!!
Replies: 4
Views: 913

Re: MotoCzysz NICE E-motor sound!!!

Latest bike


With Michael Rutter up for the IoM. Does anyone know when their practice laps happen?
by jbond
May 31, 2011 11:21 am
Forum: E-Bike General Discussion
Topic: EU is trying to kill the ebike!!!
Replies: 32
Views: 2326

Re: EU is trying to kill the ebike!!!

I say the E.U and it's rules and taxes can go In the UK, until the EU legislation is ratified, the limit is technically 200 Watts cont. .... :) Is it? Maybe. Perhaps. We seem to have some mishmash at the moment with the exact state of the law being a bit undefined. 250w, 25kmph, but throttle only a...
by jbond
May 31, 2011 11:18 am
Forum: E-Bike General Discussion
Topic: EU is trying to kill the ebike!!!
Replies: 32
Views: 2326

Re: EU is trying to kill the ebike!!!

You've got to separate out the arguments about Electric Bicycles (25KMPH, 250w) and Electric light motorcycles. As far as I can tell none of the articles mentioned are arguing for changes to the E-Bicycle law. I thought that was what the lobbying and petition was all about? I'm all in favour of tak...
by jbond
May 30, 2011 3:28 am
Forum: E-Bike Technical
Topic: Lightweight bike project
Replies: 27
Views: 2123

Re: Lightweight bike project

I don't believe anyone makes a rear motor with a cassette for the gears. They all take a freewheel. And freewheels are pretty much limited to 7 speed. On "too much is never enough". This is from scanning the forums for a while rather than personal experience. If you're serious about light weight and...
by jbond
May 28, 2011 3:43 am
Forum: E-Bike General Discussion
Topic: How to Solar Charge an Electric Bicycle
Replies: 493
Views: 54723

Re: How to Solar Charge an Electric Bicycle

AC power comes in, gets rectified to DC, filtered with a cap, then switched at 50-500khz, run through a step down transformer, rectified again, and then sent to a regulation stage (linear or switching), then filtered, and sent to the pack. Just hook the cells to the battery if you wanted to do it t...
by jbond
May 26, 2011 5:02 pm
Forum: E-Bike General Discussion
Topic: How to Solar Charge an Electric Bicycle
Replies: 493
Views: 54723

Re: How to Solar Charge an Electric Bicycle

Another option. Get 3 12v trickle chargers designed for a car. Wire them in series to get ~36v. Then get a spare 36v battery charger for your 36v E-Bike. Open it up and apply the solar 36v out to the rectified side of the 4 diode rectifier on the 240v input side of the charger. Just curious, are yo...
by jbond
May 26, 2011 2:41 pm
Forum: E-Bike General Discussion
Topic: How to Solar Charge an Electric Bicycle
Replies: 493
Views: 54723

Re: How to Solar Charge an Electric Bicycle

Another option. Get 3 12v trickle chargers designed for a car. Wire them in series to get ~36v. Then get a spare 36v battery charger for your 36v E-Bike. Open it up and apply the solar 36v out to the rectified side of the 4 diode rectifier on the 240v input side of the charger.
by jbond
May 26, 2011 9:10 am
Forum: E-Bike Non-hub Motor Drives
Topic: Commuter Booster - <1kg Friction Drive
Replies: 1342
Views: 202033

Re: Commuter Booster - <1kg Friction Drive

I think you missed this one posted once before on this thread. http://www.recumbents.com/wisil/tetz/TransientSpikeReduction/default.htm I like the way this is a very simple analogue current limiter, just pulling down the throttle input when the current goes too high in much the same way the CA curre...
by jbond
May 22, 2011 2:59 am
Forum: E-Bike General Discussion
Topic: EU is trying to kill the ebike!!!
Replies: 32
Views: 2326

Re: EU is trying to kill the ebike!!!

You've got to separate out the arguments about Electric Bicycles (25KMPH, 250w) and Electric light motorcycles. As far as I can tell none of the articles mentioned are arguing for changes to the E-Bicycle law. The changes are a side effect of the motorcycle laws. Rightly or wrongly, the EU is trying...
by jbond
May 06, 2011 11:20 am
Forum: E-Bike Technical
Topic: Henry111's free tech support thread
Replies: 984
Views: 17099

Re: Lithim Polymar powering eBikes?

Just to further confuse, BMSBattery have started selling Headway based High C LiFePo packs with a choice of BMS in 20A-60A-100A ratings. High C, High LifeTime, Safe but with LiFePo's weight. Every so often they also sell the latest ECityPower LiNiCoMn packs. They're quite a bit lighter and smaller a...
by jbond
May 06, 2011 2:43 am
Forum: E-Bike Technical
Topic: Henry111's free tech support thread
Replies: 984
Views: 17099

Re: Lithim Polymar powering eBikes?

I've been involved with flying RC fixed and rotary wing craft for well over a decade and, wheeled RC for more than 20 years. Having said that, my next battery will, most likely, be a "custom" assembled Lipo (w/bms) unit. However, I decided to use an aluminum cased 36v 10ah LifePo4 battery for my fi...
by jbond
Apr 20, 2011 2:05 pm
Forum: E-Bike Technical
Topic: Apology to Lyen ...(sensorless controller)
Replies: 12
Views: 1863

Re: Apology to Lyen ...(sensorless controller)

WHAT? I thought you couldn't run a geared motor like the MAC/BMC sensorless!! Are you running a 12fet? if so how many amps are you pushing through that thing? Is it getting hot? mine with the stock 16g phase wires gets hot at constant 30-40a on 60v.. i figured... it can't be pushed much further due...
by jbond
Apr 18, 2011 6:30 am
Forum: E-Bike General Discussion
Topic: 250w gear motor. what amp limit not to kill the gears.
Replies: 12
Views: 1416

Re: 250w gear motor. what amp limit not to kill the gears.

Hi everyone. I'm a new member and first time question asker so please don't slam me! I'm in the UK and am suffering from hardcore e-bike regulations. I am currently trying to bend the UK rules by being as incognito as i can with my set-up. I have two 250watt geared 'mini' motors. I also have a 54v ...
by jbond
Apr 13, 2011 11:04 am
Forum: E-Bike General Discussion
Topic: Hey, this battery looks pretty cool. Anyone know about it?
Replies: 29
Views: 1476

Re: Hey, this battery looks pretty cool. Anyone know about

Damn battery tech won't keep still! LiNiCoMnO2 seems to be replacing LiMn as the chemistry of choice for low end batteries. It's lighter and smaller than LiFePo but with the same reduced lifetime of 1000 cycles or so compared with 2000 for LiFePo. We're also seeing this appear in high C rating cylin...
by jbond
Apr 12, 2011 3:33 am
Forum: E-Bike Technical
Topic: Conhismotor 48v 10ah LiFePo4 (LiMn2O4) in aluminium case
Replies: 135
Views: 12693

Re: Conhismotor 48v 10ah LiFePo4 (LiMn2O4) in aluminium case

Did the questions about the chemistry ever get resolved? BMSBattery were briefly selling LiNiCoMn shrink wrap batteries but they've now disappeared. These seemed like a pretty good weight, volume, price, capacity, lifetime compromise. Claimed 1k cycles vs LiFePo's 2k cycles, but cheaper and 1/3 ligh...
by jbond
Apr 11, 2011 10:45 am
Forum: E-Bike Technical
Topic: Installing pas sensor on sprocket side...
Replies: 6
Views: 1990

Re: Installing pas sensor on sprocket side...

I'm quite curious about this. On my PAS it definitely only kicks the motor if I rotate the pedals one way, not the other. And I can get it to power the motor when reverse pedalling (not very useful !) by reversing the magnet disk on the left crank arm. So what's the orientation of the magnets? And h...