This is my first post on this group. Seems to me an excellent forum for our ideas. The choice of a battery impacts many aspects of ULEA design if planning to...
Most motor controllers work by varying the PWM, to vary the motor speed. There is also an interesting thread on Endless Sphere, regarding Armature Current...
My approach to an ULEA has been to try to match the motor and gearing so the motor is operating near it's peak eff. at my usual cadence at the battery voltage....
... Armature Current Limiting, to limit low speed amperage spikes. Could be a suitable option for this project? ...... Could you give us the URL on this...
The only way I know to get spell check is to compose in another word- processing program, then cut and paste into the message/compose window. Composing...
Dave wrote; ... email from your email editor to ULEA@yahoogroups.com and you have your private spell-check ....Translate this for me. What or where is this...
ULEA'ers: To post messages to the group, you have two options. 1. From your normal email program, send an email to ULEA@yahoogroups.com. This method posts the...
I assume everyone has read John Tetz's paper on Low Weight, Low Power E-Assist, http:// www.recumbents.com/wisil/tetz/e-assistmetric/ . Let's use the paper as...
I very much agree with the low power approach. I live in flat country and the only demands I have from an assist system would be when I have to climb a local...
Throughout the power assist group and other areas, there is talk of using off-the-shelf DeWalt 33v batteries. I'm aware that John's system uses lower...
... country ... have ... best ... through ... motor was ... bridge ... I agree with John's low power, low assist, however I am concerned about my weight, trike...
I went the website to find a TM 430-20 motor and because my German language skills never developed, I was unable to determine the price of these motors. ...
... language ... these motors. ... get price ... several inputs ... of a ... with so ... The price I have for the Mamba Max ESC only $159.00 The Price for TM...
... system ... I believe the DeWalt battery is A123. The LiPo batteries offer better energy/weight ratio, but don't have the safety margins of A123 or NIMH....
I thought PWM stood for Pulse Width Modulation and believe that it is the method used in the controller in my wife's Xebra EV, as well as in the controller of...
Yes, I meant Pulse Width Modulation. When an ESC is operating at full power, the FETs are chopping the battery voltage into three phase shifted trapezoidal...
I'm currently using a 24v/10AHr LiFePo4 battery from Yesa, weighs about 3Kg's. On my MTB, have done over 40 km with constant use as assist. Max power is 250...
Fred wrote; ... powerful motor or more batteries would be an option. ….Absolutely. I did my system to see how light a system could be. Kind of a reference...
... I use the Eagle Tree Micropower datalogger. I think its around $35 or so. There's a few of them on the market. Eagle Tre has a new system thatrecords two...
ULA Electronics Jan 22, 08 While we are on the subject of electronics and ESCs I used the Mamba Max for it's over current abilities, but more IMPORTANT is...
About 12 -13 'lbs', I think. Reminds, I should weigh my bike to see what it weighs 'fully loaded'! Actually, if I added the system to my lightweight Al and CF...
Rob, What is your experience of the performance of the LiFePo4 battery when reaching the end of it's charge. John found that one cell of his NIMH battery...
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