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Free energy mod! (europe.pub)
submitted 1 year ago by to c/linkedinlunatics@sh.itjust.works
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[–] 26 points 1 year ago (8 children)

Too heavy? You just run the motor in reverse which turns it into a generator and adds friction to do generative braking. There really isn't any added weight.

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  • [–] 15 points 1 year ago (3 children)

    Bikes normally have freehubs, a ratchet on the cassette (sprockets) of the rear wheel, when you stop pedalling the bike freewheels, without that the pedals would keep turning.

    This makes driving a motor from the wheel impossible without heavily modifying the normal bike mechanics. That's why regenerative braking on e bikes is rare.

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  • [–] 10 points 1 year ago (2 children)

    Not if you have a hub motor. Those don't interact with the gear system at all.

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  • [–] 2 points 1 year ago

    Only very cheap e-bikes have hub motors. They're not a good idea precisely because they don't interact with the gearing system. So you lose that functionality.

    It's not worth losing access to gearing just to get regenerative braking because the amount of power being used isn't worth trying to recoup.

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  • [–] 6 points 1 year ago (3 children)

    It needs a direct drive which is more weight than the other systems

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  • [–] 5 points 1 year ago (2 children)

    Why would it need a direct drive? A mid drive can do the same thing they just don't usually since you'd need to gear for it. direct drives are the most efficient at regenerative braking but they aren't the only type.

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  • [–] 1 point 1 year ago* (last edited 1 year ago)

    Could be done, perhaps, with significant added complexity (and hence maintenance). In practice it is not, to my knowledge there are no mid-mount regenerative system on the market. It is worth noting that mid-mounts are significantly more efficient than hub mount, enough so that even compared to hub mounts with regeneration, mid-mounts have more range for a given battery / wattage. The vast majority of hub mounts also do not implement regeneration.

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