April 26, 201412 yr This old post brings back memories Dan. I use those controllers all the time for my Tongxin and Keyde motors. On the ones I get you have to add wires to program them (and will need a USB programming lead) and pick up the other board options like cruise control and power level options, unless e-crazyman sells them pre modified ? The alternative is to buy the more expensive lyen versions which come with programmable lead and other options ready fitted/enabled. Regards Jerry Edited April 26, 201412 yr by jerrysimon
April 26, 201412 yr Author Yes, good memories! Experimentation, technical apprenticeship ... still learning though Both my controllers are based on the EB806 board (precursor to EB206 which comes with an upgraded Infineon chip), so the programming options are limited. However, I get everything I need: - Speed restrictor (extra cables soldered to circuit board + connector, to comply with legislation ... I'm not actually using this as my full assisted speed is physically limited by the size of the wheel and the motor's max RPM anyways) - 3-speed switch (I use this all the time when I ride, alongside my Brompton's 6 "physical" gears) - Throttle control (I use this to quickly get out of the way at intersections, from cold start) - PAS / pedal velocity sensor (I rely on this most of the time, allowing the controller to adjust the e-assistance without me having to "think" about it) The problem with the USB/TTL (or RS32) protocol is that ; as far as I know ; data can only be written to the chip, it cannot be read / dumped. So I wasn't able to compare the stock settings with my own. At the moment I use 16A rated current (which is the max DC current, effective when cruising along), and about 2.5x that value for the phase current (effective in burst mode, when starting the motor). These parameters are to be interpreted in the context of the controller's hardware though (MOFSET rating, etc.), so they are representative of the actual current flowing from the battery to the motor under load, with some arithmetic formula adjustments. For example, my Cycle Analyst never shows 16A, more like 12A peak. There's an "open source" controller sold on endless-sphere, but it's 300 USD, not worth it for a low-power application like our e-Bromptons. Cheers, Dan This old post brings back memories Dan. I use those controllers all the time for my Tongxin and Keyde motors. On the ones I get you have to add wires to program them (and will need a USB programming lead) and pick up the other board options like cruise control and power level options, unless e-crazyman sells them pre modified ? The alternative is to buy the more expensive lyen versions which come with programmable lead and other options ready fitted/enabled. Regards Jerry
April 26, 201412 yr Author -- ParameterDesigner.exe settings for my controller -- At the moment I use 16A rated current (which is the max DC current, effective when cruising along), and about 2.5x that value for the phase current (effective in burst mode, when starting the motor). Today's ride (as indicated by Cycle Analyst): 15km => 2.8Ah consumed from my 10Ah LiFePO4 battery. http://www.pedelecs.co.uk/forum/threads/diy-stage-2-received-li-ping-lifepo4-battery-photos.4734/page-2#post-216434 It's quite hilly around here, and it was windy today. Max current draw was 15A, and I could effectively see 12A displayed on the CA (when battling up hills ). The Tongxin motor didn't slip at all at 400W output, but I am aware that the repeated strain (torque) on the motor's alloy axle / wall is probably not recommended (judging by forum photos of fractured sides). Anywhoo...great solid unit this 190rpm Tongxin!!
April 26, 201412 yr Dan they now do a 290-300RPM version in 28h and 80mm wide. Perfect for they Brompton Jerry
April 26, 201412 yr Author Dan they now do a 290-300RPM version in 28h and 80mm wide. Perfect for they Brompton Jerry Nice for extra top speed! I would love to compare with the low-end torque of my 190rpm model. In case I am wrong in my assumption about mechanical gearing demultiplication (relative size of friction rollers), then the technical difference to achieve the various RPMs must be in the internal windings. How many $$ for a fully-laced Tongxin 300rpm (28h)? Dan
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