A direct drive hubmotor is inexpensive, easy, and strong. Nevertheless, they flip on the similar low pace because the drive-wheel. Electrical motors carry out finest at increased RPM’s and that’s the reason the most typical hubmotors are geared, normally permitting the built-in motor to spin 5 instances quicker than the wheel. A typical 26-inch bicycle wheel is simply spinning 336-RPM’s at 26-mph (42 km/h).
When you mount a hubmotor into the body and drive the rear wheel with a sequence, an entire new world of efficiency opens up. First, you possibly can simply gear he motor with sprockets to run 2:1 or 3:1 to the rear wheel, with the motor spinning quicker than the wheel. Even when solely utilizing my most well-liked 52V, a “excessive kV” motor (low turn-count) can spin on the new RPM’s to provide the similar wheel-speed with increased torque and decrease waste-heat. In case you don’t have a choice already, I’d counsel experiments begin with the “Leafbike” 1500W DD hubmotor, as a result of it has the thinner 0.35mm laminations in it’s stator, which leads to much less eddy-current waste-heat…
Additionally, to dramatically enhance the heat-shedding in a big DD sizzling rod hubmotor, add 10ml of Ferro fluid (click here), and in addition (click here).
The second manner by which utilizing a DD hubmotor as a non-hub is a serious profit, is that it removes the load of a big DD hubmotor from the unsprung wheel-weight, and re-mounts it into the body. This permits the costly rear suspension of a complicated off-road ebike to have a really gentle and responsive really feel to tackling a tough downhill run. A big and highly effective rear hubmotor has remained a useful option for street hot rods, however it’s going to at all times be a compromise for troublesome downhill runs.
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#1. Customized construct from Adam, in France
This builder is well-known to us (ES member bzhwindtalker), and he has began an organization promoting the LMX-64 (Click here). “LMX” means Mild Moto Cross.
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#2 Rassy’s 6×10 TerraTrike, from Oregon
After I first noticed this construct again in 2010, It blew me away. The 6×10 identify signifies that it’s a “six flip” winding, utilizing ten strands of copper wire per flip. That’s a fairly quick winding since he gears it down between the motor and drive-wheel, plus he’s driving a smallish 20-inch rear wheel. This leads to the trike having a ton of wheel-torque and the motor by no means appears to get sizzling, even on steep hills.
“…I simply maintained 8 MPH up the 15% grade…”
The revolutionary factor about this construct is that he runs the motor in reverse (simply completed by swapping two of the three motor part wires), and he drives the rear wheel off of the underside of the freewheel that’s mounted on the hubmotor. Look carefully on the pic under. Because the rear wheel is spinning within the ahead route, the hubmotor is spinning in reverse (counter-clockwise, as proven from the suitable aspect).
This allowed him to mount a traditional freewheel in the usual place on the threaded hubmotor freewheel mount. Within the pic under we are able to see that he’s utilizing a 16T heavy-duty White-Industries ENO freewheel. After all he needed to fabricate some customized bracketry to realize this, however his printed pics present a reasonably straightforward strategy to accomplish that.
There are a selection of how to realize the identical outcomes, however this association avoids the necessity for a separate jackshaft between the motor/pedals, and the rear wheel.
For extra particulars, the build-log can be found by clicking here.
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#3 Tench’s Specialised Supercharged Racer
We wrote about this practice construct 9 years in the past in 2012! (for that article, click here). It stays a excessive water-mark that different builds can aspire to. The builder is endless-sphere discussion board member “Tench”, and the “Supercharged” identify is in response to the weak Specialised “Turbo Levo”. On the time, the Crystalyte Direct Drive (DD) hubmotor with a 35mm large stator was the most typical improve to extra frequent “1,000W” hubmotors with a 28mm large stator, and you’ll simply see the place he mounted it.
When a big DD hubmotor is mounted within the typical manner within the body drop-outs, the Crystalyte was identified for breaking the axle when builders raised the watts of energy through the use of additional volts and amps, and generally it might additionally overheat. Simon is from the UK, and his construct used 66V and 40A equaling 2600W, however because it used a high-speed winding and geared it right down to a decrease RPM, the wheel-torque was off-the-charts.
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#4 Thriller Customized Construct
I’m not likely positive about any of the main points, if anybody has data about this instance, please e-mail me.
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#5 Paul Brodie’s eBee from 2013 NAHBS
You could find extra particulars about this construct by trying out our article by (clicking here). This construct is as customized as it will possibly get. Paul used a CNC to make distinctive elements that he had drawn up on some paper only a few moments earlier than he began the machine. He didn’t use the biggest motor to maintain this construct gentle, and he additionally constructed the battery pack to be as small as potential. Then he mounted the pack as little as he might get it, seen under because the darkish block simply in entrance of the pedal-sprocket.
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#6 The M55 Terminus
This ebike is now not obtainable, however for a short while in 2012 it was offered to the general public as a VERY costly possibility.
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#7 The “Tremendous V” from John in Costa Rica
Countless-sphere discussion board member “John in CR” has been a really revolutionary builder for a very long time, with this construct being posted in 2012.
“…The 28T on the motor 48T on the wheel discount makes the 9C [motor] successfully operating a 12″ wheel so it will likely be in a position to climb something…(ratio 1.7:1)”
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#8 Fume’s 9C customized construct
There are crank-sets which have a sprocket on each side of the “backside bracket”, and they’re for the “stoker” back-seat place on a tandem 2-seat bicycle. Countless-sphere discussion board member “Fume” used considered one of these to permit him to mount a DD hubmotor with the sprocket on the left aspect. Doing this allowed him to make use of a freewheel within the ordinary place.
When doing this, the motor can drive the system via the freewheel, however when unpowered…you possibly can pedal with out driving the motor…which might have a small quantity of drag from the rim-magnets being drawn to the metal within the stator enamel, which is named “cogging”.
Again in 2013, the “9 continents” / 9C motor was a typical DD hubmotor to make use of. For extra particulars, the construct dialogue can be found by clicking here.
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#9 Hannes’ customized mid-drive
This practice construct is among the {most professional} I’ve ever seen. The builder is from Austria, and he determined to make use of a geared hubmotor as a mid-drive. You could find extra particulars in our article by clicking here.
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#10 the Appel Cruiser
ES member “APL” constructed this hub-as-a-non-hub cruiser in 2018.
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#11 The V3 Illegalbike, from Russia
The small print of this practice construct from Russia can be found by clicking here. The swingarm pivot is concentric with the axle of the hubmotor, so this doesn’t want a sequence tensioner.
Here’s a video of this practice construct
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#12 The APL V4 Dreadnaught
Because the identify suggests, that is “Model 4” of a avenue ebike cruiser made by ES member “APL”. A earlier model by him might be appear listed above. He named this construct the “Dreadnaught” after a battleship from many a long time in the past, because the high-amp and long-range battery pack weighs 35-lbs! The phrase “Dreadnaught” means “I concern nothing”…
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Written by Ron/spinningmagnets, July 2021