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Dual electric hub motors?

Old 06-07-20, 11:25 AM
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Bluesfrog
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Dual electric hub motors?

What are the problems involved with two motors? I have had a mid drive mess up and not be rideable. I had to walk the bike back to the house at 0400 and then drive the truck to work. I was thinking about having a front and rear hub motor with dual battery for long lasting use. Micah Toll did a you tube review of one just a few weeks back possibly for Electrek. I have to go back and find it to see if the rear was a hub drive or mid drive? What do you guys think about this use of hub motors? Be Well, Bluesfrog
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Old 06-07-20, 11:44 AM
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The Super Monarch?
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Old 06-07-20, 12:35 PM
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I constructed a dual-motor bike with separate 350w, 36V, PAS front and 1000w, 52V, throttle rear and it worked perfectly for me except (and I'm ashamed to say this) it was too fast. Plus there was no need for the extra weight of two systems. I did it as an exercise since I've maintained that challenged individuals could have two separate systems and never worry about getting stranded. It's more challenging with one battery and a split throttle, but two separate, dedicated systems, piece of cake.
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Old 06-07-20, 01:55 PM
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I thought if a motor failed one could always ride further on own power alone?
Can a mid drive not be disengaged or so?
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Old 06-07-20, 02:26 PM
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Originally Posted by Novalite View Post
I thought if a motor failed one could always ride further on own power alone?
Can a mid drive not be disengaged or so?
Of course you can. My statement was about physically challenged individuals having two dedicated systems. There are times when I ride my e-bikes without power for "fun".
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Old 06-08-20, 10:14 AM
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I've seen this done with two small hub motors. Seemed a little too complex for the value for me personally.
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Old 06-08-20, 11:44 AM
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Originally Posted by 2old View Post
Of course you can. My statement was about physically challenged individuals having two dedicated systems. There are times when I ride my e-bikes without power for "fun".
I was referring the topic story, this part:
"I have had a mid drive mess up and not be rideable. I had to walk the bike..."
As I interprete it, the bikes drivetrain was unusable due to that mid drive failure. And I wondered how/why.
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Old 06-08-20, 11:54 AM
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You're correct, and sorry I misinterpreted; should have been usable since a clutch disengages the motor from the pedaling system. However, can't say definitively whether it could happen, but hope not since sometimes I'm pretty far out in the woods.
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Old 06-08-20, 03:27 PM
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At 0400 it was dark and I couldn't see there were two chain guards. Only the larger outer one. I thought I re-aligned the chain and gave a hard push by standing on the pedal. All I did was twist the chain. The inner chain guard made it tough to see what was going on. After thoroughly jamming the chain I walked the bike home. It was in warranty and Trek provided a different chain ring to keep the chain from jumping. On the dual drive unit and with a front hub motor I could have driven the bike home and the rear would have free wheeled to allow a powered ride to the house. AS it was I could only walk the bike home, the chain was jammed. Something I suspect here. The factory KNEW there was a problem and the inner chain guard was used to keep the chain from jumping when changing gears! I haven't had it happen after getting the new chainring. Be Well, Bluesfrog.
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Old 06-08-20, 03:36 PM
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How about 2 350 W 48 V overvolted to 52 volts with a separate battery for each? I'm guessing a controller for each? A brake mounted switch front and rear for Regenerative braking. That is to help slow the bike down more than to generate a recharge. Be
well, Bluesfrog.
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Old 06-08-20, 07:58 PM
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Originally Posted by Bluesfrog View Post
How about 2 350 W 48 V overvolted to 52 volts with a separate battery for each? I'm guessing a controller for each? A brake mounted switch front and rear for Regenerative braking. That is to help slow the bike down more than to generate a recharge. Be
well, Bluesfrog.
Just remember you (almost) always need a Direct Drive motor for regenerative braking. The only place that I'm aware of with a geared motor with this feature is ebikesca. That's what I did with the dual system: two motors, two batteries, two controllers, two throttles.
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Old 06-09-20, 08:05 AM
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Does not seem to make sense having the added complexity, cost and weight. A single motor that is of good quality will give you a better overall experience (unless you need more traction or torque)
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Old 06-09-20, 10:23 AM
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Originally Posted by jetpilotVE View Post
Does not seem to make sense having the added complexity, cost and weight. A single motor that is of good quality will give you a better overall experience (unless you need more traction or torque)
I agree, and did it just to see what it felt like and to prove the concept (as if it needed to be proven) that two dedicated systems would insure that a physically challenged individual could go e-biking and not worry about a motor failure since there was a "backup".
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Old 06-11-20, 03:31 PM
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Maybe we could try this again for VE. Rear drive goes out. Front drive gets you home. SAVVY? Be Well, Bluesfrog.
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