Electric Bikes - front and rear hub motors
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07-02-08, 09:19 PM
has anyone tried it yet?
I am curious to know if it would work ...
07-03-08, 08:25 AM
Of course it can work but why? If brushed motors could probably run off single controller. BLDC not so much. I saw a trike on youtube recently that had dual motors. Dunno what the point is but it can be done.
if you want two-wheel-drive for snow/ice/mud it may be a good idea.
if you just want a ridiculously high amount of power, use one big motor instead of two smaller ones. The crystalyte 5xxx series motors can handle more than 3000 watts, and carry you a lot faster than you ought to go on a bicycle.
I have been waiting for the new Schwinn electric bike to come out. I am thinking on putting a bionx 350 on the back wheel. By setting the bionx on level 1 or 2 and using the Schwinn pedelec normally I believe I will have plenty of power for at least 50 miles. Anybody have any feed back on this idea?
If it's just extra range you're after, it's better to add batteries than to add motor+batteries.
Almost every e-bike motor/controller is compatible with any battery that'll supply the proper voltage and current. So simply adding more batteries (obtained from wherever) is an appropriate way to extend your range. But you'll have to either switch from your original battery to your new battery, or safely use the batteries in parallel (which tends to make the batteries perform better). There are a variety of factors that could influence whether you can safely add batteries in parallel - using diodes that can handle the necessary voltage and current, configured to prevent one battery from charging another, tends to be the safest... but it's probably totally unnecessary if you are only using lead-acid batteries.
The exception is that BionX claims you must use their proprietary batteries. I think someone on this forum said they successfully added a 12V voltage-booster battery (i.e. added in series) to their BionX system, and BionX's claim that their system couldn't be hooked up to other makers' batteries seemed kind of doubtful to me to begin with.
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