Geared motors regen ? power to the masses!

General Discussion about electric bicycles.

Re: Geared motors regen ? power to the masses!

Postby MadRhino » Sat Aug 12, 2017 12:44 pm

No motorization can come close to a DD hub for low maintenance. For me, since I started using big motors, it is new bearings every 20,000 miles, plus brake pads and rear tire every 6 weeks. That is using regen very sparsely, on a bike that weights 70 lbs, riding above 50 mph daily with a top speed about 70 mph. I have a very good freewheel that's not sealed, still riding after 40,000 miles on 3 motors and 2 bikes (a White that was on my dirt bike for 10,000 miles before being on my commuter).

The performance that I ride would kill almost any drive the first day, except motorcycle drives and still, they would be higher maintenance.
Make it fool-proof, and I will make a better fool.
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Street: https://s20.postimg.org/ewrvugywt/Session_04_2015.jpg
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Re: Geared motors regen ? power to the masses!

Postby neptronix » Sat Aug 12, 2017 10:59 pm

qwerkus wrote:At least on their alibaba store, keyde claims that their geared motors have no clutch at all. Weight is only one factor: from what I understand, DD hub motors are quite inefficient at startup so geared motor is the way to go in stop-start city commute.


If keyde offers a 1000W rated motor with the highest efficiency available lams, and the ability to readily get replacement parts, and is durable as a MAC, i'll try one.
My first major build: 8T MAC motor on a Trek 4500.
The new all-arounder: Leafmotor 1500w on a Turner O2 full suspension.
The wheelie machine: 20" Rear Magic Pie II on a Trek 4300 MTB

"The best time to plant a tree was 20 years ago. The second best time is now."- Chinese Proverb
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Re: Geared motors regen ? power to the masses!

Postby Alan B » Sun Aug 13, 2017 12:51 am

I bought a high quality and expensive white freewheel, but it is larger and requires machining to fit on my 120 pound bike, so have been consuming Dicta's until that project to fit the white completes. The Dicta's do last longer when lubricated. Plus they are much quieter. :)

The variable electric braking / regen makes brakes necessary only for emergencies and the last mph of braking to a stop on this ebike.

A geared and clutchless motor will make an interesting addition to the options. Normally it would have rather significant coasting losses, but with modern laminations perhaps it will be similar to a DD, though geartrain losses are never zero.
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Re: Geared motors regen ? power to the masses!

Postby marvak » Sun Aug 13, 2017 4:21 am

qwerkus wrote:but i would be more impressed by local contests of cyclists measuring the power they produce knowing that it's beeing fed into the grid (using an inverter) than by wasteful tour-de-france like competitions...


Let me just answer this. My father for one is huge fan of tour de france, and for him watching it, is about scenary/helicopter video and remembering most of roads/rides that he and my mom rode bikes on.

So watching guys ride bikes in room is another story. Maybe better example would be velodrome racing, but nobody watches that anyway.
Last edited by marvak on Sun Aug 13, 2017 4:22 am, edited 1 time in total. View post history.
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Re: Geared motors regen ? power to the masses!

Postby Alan B » Mon Aug 14, 2017 11:05 pm

Watching a pro rider sweat on a fixed bike sending power to the grid is about equally as interesting as watching a 250 watt solar panel in the sun doing the same thing (minus the sweating part). It won't sell (and the solar panel will win).
Last edited by Alan B on Mon Aug 14, 2017 11:06 pm, edited 1 time in total. View post history.
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