John, that's an effective solution to what was a vexing problem. With your new battery, such complexity is unnecessary as the cell voltage is high enough to...
The Tongxin motor perfomance curves for the 36v version show the peak eff. at about 8A which is 280W input power and is at 195rpm. They list the rated power...
Elden, You have confused with me with following statement. You want a geared system for efficiency, and then you say you only want it in the lowest gear? I...
... A rear hub version can be expected to be threaded ... .......So this means there is rather poor gearing for the human power part. Not good. This encourages...
Rob, I should have said smallest chainring so the cassette sprockets are available to match my cadence and the motor's best operating range. If I were driving...
Hello everyone... I've been lurking a couple weeks. Hopefully better than 50% ULEA efficiency might be obtainable. Maybe this has already been considered, but...
There is a guy in Tasmania who is using one of these motors to drive a BB system. Apparently, because of the type of gearing reduction, it is a very quiet...
Since this hub motor has full freewheeling it has to be able to start with a load. Direct-drive hub motors with sensorless technology can use back emf to time...
Juergen Weichert
juergen@...
Mar 3, 2008 9:40 pm
204
A sensorless ESC has a programmed starting process that assumes the motor will come up to a speed high enough to produce a back emf that can be used for sync....
... of 14% grade. With careful concentration I can maintain balance at 4mph. With assist I would expect to be able to look at the scenery some. ....Yikes 1/2...
... Most all of the model motors have either a transmitted signal or a Servo Tester that sends an appropriate signal to the ESC to start the motor. I have a...
I second that one John! I built my trike last year, and since then my DF has hung up in the garage, I am now building a two wheel recumbent SWB bike. On my...
John Hopkins and John Tetz, Thanks for your replies. Here's a little more clarification on this concept: 1) A large chainring or toothed belt pulley would be...
Conrad, If you use a good quality bicycle freewheel cog, I think you will find that there is very little parasitic drag. The freewheel cranks I use are also...
The 24v Tongxin motor has higher Io and lower Rm than the 36v version with it's peak eff. at 8+A. The 36v motor operated at 24v should provide useful climbing...
... 1/2mile ... took ... Well ... have ... I ... I have a Leitra that I purchased expecting to do that commute, but don't feel comfortable on that route. Its...
... .......50 is a wonderful age. Half a century. You old enought to have some real experiences giving you some wisdom. And your body is still able to go for...
... .....I have ridden a Leitra and that noise issue is for real. Not only in the Leitra but any of the composite head in shells. I chose open cockpit designs...
... off. .....Most of the freewheels will coast about 2% loss - not bad but I had added up all the efficiencies in a typical drive train and even though they...
Elden, Interesting concept! Running a motor rated at 36v at a lower voltage? Most people go the other way, and run at higher voltages. I would think that by...
... voltage? ... effectively ... And if ... Lower speed is what I would be looking for at lower voltage. Both motors appear to be designed for about 200rpm....
I'm surprised the efficiency of this motor is so low-peak efficiency of my brush motor is about 70% according to the manufacturer's curves. vs. 78% for the...
... efficiency of ... vs. ... 80's to ... etc) ... Efficiency of a permanent magnet motor is a function of several parameters, not just brush friction. The...
I'm a little bit, let me correct myself, I am totally overwhelmed with what I don't know about the whole battery, gearing and motor combinations, installation...
... with ... contacted ... help ... you, ... I've been considering publishing my decision process after getting to the working product, but will comment now in...
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