I decided it's time to unleash the beast to the rest of the world and stop hogging all the fun for myself. Without question this is the best hubmotor available to us DIYers for under $5,000, maybe for any price, so it's well worth the bike mods needed to run HubMonster if you want high power. eg With simple ventilation mods I run mine at 111V nominal with combined controller limits of 250A/380A battery/phase limits, resulting in no heat problems running a 5" wide 19.25" OD scooter tire pushing a 400lb load with incredible acceleration and a top speed on the flats of well over 100mph. I'm a beached whale, so imagine the performance you light guys can experience.
It's got a claimed peak efficiency of 94.6%, and while I can't test efficiency I believe the claim since I ran it in sealed stock form at 15kw hotrodding with a beached whale aboard for 9 months without getting hot. No typical efficiency hubbie can come close. I've also seen a long term decrease in wh/mi of over 15% despite riding harder and slightly faster on average.
It's 6 phases give it the smoothest quietest launches of any hubmotor. The axle is 1" diameter with 15.5mm flats, so no worries about snapping this axle. The stator is coated to protect against corrosion, and the internal terminations of all those phase wires are slathered in a high temp epoxy. For those wanting to push the limits more than I do there's even a thermistor already attached to the stator steel with a 95°C trip point. There's a heavy duty 3 bolt disk brake mount.
The only optional accessory is a 13" alloy rim that bolts to the flange on the motor. The price of the rim is $48. I run a 130/60 13" scooter tire which is a bad boy at over 5" wide with an OD of 19.2" . A 150/70 13 tire should also fit which would be almost an inch wider and if I understand tire sizes correctly will push the diameter above 21". The nice thing about a bolt on rim instead of a built on is that you bring the rim and tire to the tire place and get it installed. Scooter tires are a nightmare to install by hand. The 12 bolt attachment works nicely for manual balancing, and I did mine with extra nuts and washers pretty quickly with trial and error.
The motor has a Kv of 16rpm/volt (edit 18.3rpm/volt with no wheel). I push 210A peak from a 20s20ah20c RC Lipo pack at get it up to 65mph on the highway with voltage sagging to about 75V. To be sure I was stating fact I just weighed myself and the bike with its current pack configuration and I weigh 265lbs (120kg), and the bike 122lbs (55kg). That doesn't include the 25lbs or so commonly in my backpack for the generally uphill ride home. I'm not into high speed on 2 wheels, but with good aero and higher voltage there's lots of unexplored speed, because it's a 10 pole motor with high quality thin laminating steel of approximately 3 lams per mm.
While the motor is 6 phases, I figured out how to run it with dual 3 phase controllers. There aren't any sinc issues, because the dual 3 phase windings are 1 tooth different on the timing, so a single throttle is fine. That means cheap controllers work great. I've been using about $250 worth of controllers to run 15kw with a totally stress free system. If you go the cheap controller route, you'll probably want the newest CA for throttle control, and you'll need a stand alone shunt too. I'm becoming a distributor for Grin, so I can help make that happen if needed.
Shipping is out of China directly from the factory, because I simply can't afford a network of distribution centers across the world to hold ocean shipped inventory for local ground shipping, and all that overhead is unlikely to save much if any money anyway. The raw motor is 15.6kg and with rim the overall shipping weight is typically 21 kg, and air shipping runs $10-13/kg depending on your part of the world. We do once a week batches, and you get your motor within 30 days. In 8 months only one was late, and most were pleasantly quicker. Chinese New Year is coming up, so we'll probably have to stop taking orders from late this month thru mid February.
This motor is the real deal. It's performance is possible due to the high efficiency, which is the result of advanced design and very high build quality. Things like bigger amounts of higher quality stator steel and more copper, and curved instead of flat magnets are part of what create the higher efficiency. It's not just peak efficiency that benefits either, because the 6 phase design creates broader and flatter power and efficiency curves. eg with the factory setup the motor hits peak efficiency at over 3kw and at peak power it's still 89% efficient.
Did I mention how quiet this motor is? There's none of that startup growl or buzzing or ringing. It's really just the sound of the tire on the road.
Here's a thread discussing the motor since I started testing it in July. https://endless-sphere.com/forums/viewto ... =3&t=41604
Each controller sees a phase-to-phase resistance of 0.032ohm (combine them in parallel for 0.016ohm for comparison to a 3 phase motor).
Kv is 18.3rpm/volt (no wheel, and same running 1 controller or both)
No load current (same running one controller or 2)
3.4A at 1965rpm
1.5A at 1000rpm
1.0A at 700rpm
HubMonster $539 usd (edit Dec 2015 price increased to $587)