June 27th, 2024

Freegen ebike regenerative braking hub mechatronic discussion

The YouTube video discusses the "free genen" concept for electric bicycles, combining freewheeling and regenerative braking in a hub motor. Developed in Israel, this system enhances efficiency and control by adjusting regenerative force based on braking intensity.

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Freegen ebike regenerative braking hub mechatronic discussion

The YouTube video delves into the innovative concept of "free genen" for electric bicycles, merging freewheeling and regenerative braking in a hub motor. Developed in Israel, this system incorporates a clutch mechanism to seamlessly integrate both functions within a single motor. By attaching the disc rotor to the planet carrier inside the hub, the design enables zero drag coasting and regenerative braking, enhancing efficiency and control. The braking system in the Insight by Wheel So Alon is distinctive as it adjusts regenerative force based on the rider's braking intensity, eliminating the need for extra sensors. This is achieved through a six-magnet wheel speed sensor in the geared hub motor, offering a sophisticated yet intuitive braking experience for electric bike users.

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Link Icon 6 comments
By @thingsgg - 4 months
A fascinating idea, however it looks like the E-Bike industry has "moved on" to mid-drive motors anyway in recent years, which have the advantage of better weight distribution and being able to more tidily integrate into frames. Mid-drives don't have the missing freewheel problem, but due to this can't have regenerative braking. And I don't know, I think I'd still prefer two redundant mechanical braking systems rather than having the functionality of one being basically completely replaced to act as a fancy sensor for a software controller to know how much regen to apply. It's still great for these concepts being explored, and we're lucky to have a company like Grin Technologies in the aftermarket segment that are actively researching innovative new ideas.
By @xhkkffbf - 4 months
This is a pretty clever idea and the video does a good job of explaining how it will work. I'm looking forward to these becoming pretty standard on all ebikes.
By @serf - 4 months
I love the concept,but it saddens me that it's going to make hall-sensor/potentiometer brake levers an even more distant concept.

at least this adds a bit more granularity than the lame off/on ebike e-brake switches that are most popular right now -- but it sucks that it's at the loss of pad life rather than just sticking a dirt cheap hall sensor on a lever somewhere and leaving the pads for emergencies.

it is very clever, though.

By @esel2k - 4 months
Yesterday I was at a Bikeshop and was discouraged to buy a wheel hub motor eBike compared to a bike with these motor next to the crank. Apparently if you change your wheel (i.e. having a flat), you loose your warranty from a supplier(not going to name).

So a big negative for me is the added complexity and dependency on bike shops for simple things as changing wheels.

By @ggernov - 4 months
Grin Tech is awesome - one of my favorite e-bike companies ever!
By @jimbobthrowawy - 4 months
Cool idea, I am surprised nobody came up with it sooner.