Yep, RC motors are in a faster evolution than hub notors. Yet they are small and low power. They can compete with success against BB drives and small hubs. But when it comes to high speed and hard acceleration, they are very far from the big hubs that are available now, even if they are old technology. Many of them are capable 200 Nm and can speed well above 70 Mph, no gear shifting required. No RC mid drive build can come closeScooterMan101 said:...RC Motors are becoming more viable as a bicycle motor.
ScooterMan101 said:I am now waiting for more development progress with RC motors designed to work on bicycles. RC motors are up to 1kg or 1.5 kg for a heavy one , and now with the new 12 speed drivetrains ( Sram Eagle NX ), and now a new 9 speed e-bike drivetrain ( Box Components ) , with up to a 50 tooth cog on the rear , we will have reduction ratio's that are good enough for many of us.
and some of the newer motors have a lower KV, RC Motors are becoming more viable as a bicycle motor.
running on 6374 3200W Alien motor and is a real joy to ride.
ScooterMan101 said:A couple of years ago I searched for a 3 kg or under powerful motor , but could not find any. I have two 2.1 kg motors that are not powerful and a Mac motor that is just over 4 kg that has a decent amount of power but not as much as the DD hubs that are 2x or more its weight, and it does not have enough power to get me up steep hills (Road ) fast enough.
MadRhino said:Not a chance. One big motor that weights the same as 2 small ones, will always be capable of more power and making a better ride.
The only advantage of 2wd on a bike, is slow riding on loose terrain.
madin88 said:Have you ever ridden a 2WD bike with two MAC motors? The acceleration is insane! With only 3kW of total input power that bike was much quicker off the line up to 30-40kmh as one large Hubmotor (mxus 3k or Cromotor) with more than twice the input power.
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neptronix said:ScooterMan101 said:A couple of years ago I searched for a 3 kg or under powerful motor , but could not find any. I have two 2.1 kg motors that are not powerful and a Mac motor that is just over 4 kg that has a decent amount of power but not as much as the DD hubs that are 2x or more its weight, and it does not have enough power to get me up steep hills (Road ) fast enough.
You might want to consider a 20" wheel build if you want very high power density.
Even a modern mid/low grade 1000w rated DD motor with 0.35mm laminations will produce over 100ft-lb of torque, and cruise at 85% efficiency on the right setup. Sustained 40mph cruising speeds are very possible.
A MAC, driven with a very high RPM rated controller, will climb a wall on 20" wheels and >= 72v.. the only problem is that it will scream like a banshee unless said controller is a FOC/sine driver..
Unfortunately you're probably out of luck with the 20" wheel hack on the dual reduction motors, because the kind of controller that could handle >80,000 eRPM is in unobtanium / ungodly expensive / shitty RC controller territory.
neptronix said:That 6T needs more amps.. not more volts. ( see an ebikes.ca simulator and you'll see what i mean. ) That 6T would be nice at 40 amps or above.
A dual reduction motor can be basically like having an RC drive in your wheel.. these things spin at 3,000-5,000 rpm and have hall sensors available, so you can use more reliable, less expensive controllers than say, castle creations units you'd be stuck with on a RC motor.
( or go with a small wheel and increase your power density and actually run 72v on that MAC - it will go like a scalded cat.. )
n2mb said:But, I am wondering if the 6T would overheat while cruising at max speed (38 mph) anyway?
Would a 8T be better in a 26" wheel, if you can't really use the top speed without overheating?
neptronix said:That 6T needs more amps.. not more volts. ( see an ebikes.ca simulator and you'll see what i mean. ) That 6T would be nice at 40 amps or above.
A dual reduction motor can be basically like having an RC drive in your wheel.. these things spin at 3,000-5,000 rpm and have hall sensors available, so you can use more reliable, less expensive controllers than say, castle creations units you'd be stuck with on a RC motor.
( or go with a small wheel and increase your power density and actually run 72v on that MAC - it will go like a scalded cat.. )
neptronix said:I've ran high amp, low voltage motors.. and high voltage, low amp motors of the same kinds and not noticed a difference between the types.
In fact, the most efficient hub motor i've ever seen just absolutely loved doing 40mph on 48v and an 80A peak current limit.. it would draw ~40A cruising.. no problem!
neptronix said:It's been on there for while. Before, you could have substituted with the BMC motor.
Dual reduction motors are made by a few companies. Bafang makes the G310 ( rumor is 750w continuous on that ).. Xiongda is selling a ~3lb 350w capable YTW-06. and then other companies like outrider and keyde are selling shades in between.
There's no big dual reduction motor out there unfortunately. MAC is still the king of geared motors.