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Small Geared hub motors speeds (RPM & mph)
Small Geared hub motors speeds (RPM)
Voltage is 36 volts, wheel is 26”/700c unles otherwise indicated Ok, that add that keeps poping up on the right ----> makes the table hard to read, so I'll move the table to the second postition here... |
Small Geared hub motors speeds (RPM)
Voltage is 36 volts, wheel is 26”/700c unless otherwise indicated Q100 Measured no load speeds.
Q100 measured road speeds
*Background The 328 motor doesn't really have the power to do much over 20mph on its own without some type of assist. If run over 20mph, the controller, pulling maximum current and generates excess heat from this inefficiency. If put in a bag it will eventually overheat and fail. (I've run for years with the controller in open air with no problems). Q100 at 48V estimates (overvolting the 36v motor)I pedal at 24-26mph on a 328rpm on a road bike with 200-300 watts input from my legs. Dave at ES has posted similar numbers, his road speeds are reported at: 328rpm = 25mph (two motors) 260rpm = 20mph 201rpm = 15mph
Generic speed table TOP SPEEDS & Range (from Papa motors) Motor Type - Top Speed - Top Range - Battery 24V/500W 16mph (26KM/H) 17 M (28KM) 24V20AH 36V/500W 19mph (31KM/H) 19 M (31KM) 36V15AH 48V/500W 26mph (43KM/H) 26 M (43KM) 48V15AH 48V/1000W 32mph (52KM/H) 26 M (43KM) 48V15AH 24V/350W(Geared Motor) 14.29mph (23KM/H) 12.42 M (20KM) 24V9AH 36V/350W(Geared Motor) 16.77mph (27KM/H) 19.25 M (31KM) 36V9AH Bafang BPM & CST (8fun) motor codes and RPM for 36v (from Bafang) Code 08 is 378 rpm frt. and rear 48V slow-winds motors are Code 8 Code 09 is 335 rpm (motor code 16(9)) Code 10 is 300 rpm BMS: 48V 500w rpm393, rear, code 10 . Code 11 is 280 rpm BMS: 48V 500w rpm393, Front. code 11. Code 12 is 250 rpm Code 13 is 230 rpm BPM 36V 350W front 201 rpm 26 (13) motor Code 14 is 215 Code 15 is 205 rpm Code 15 is 192 (BPM 36V500W 201rpm (code 15) ) For speed at 48V, use factor of 1.33 increase in motor speed. MAC motor speeds (from http://em3ev.com) 6 turn high speed motor - 400rpm loaded at 36V; 6T - 45kph (28mph) 7 turn high speed motor- 350rpm loaded at 36V 8 turn standard motor - 320rpm loaded at 36V; 8T – 39kph (24mph) 10 turn torque motor - 255rpm loaded at 36V 32kph (20mph); 10T – 32kph (20mph) (STD KIT MOTOR) 12 turn low speed extra torque motor - 200rpm loaded at 36V; 12T – 25kph (15mph) |
Most of this is moonspeak to me, but I'd imagine these tables will be quite handy.
How much effect would tire size have on the top speed of a geared hub motor? Wider tire = bigger diameter = higher gearing = higher top speed? |
1 Attachment(s)
The information is invaluable when figuring out how to build a geared hub motor bike. It really should be a sticky.
For starters, this is a great place to start. It gives a reasonably conservative estimate of the type of hub motor, what size battery pairs good with it, and what you can expect for top speed and range: http://bikeforums.net/attachment.php...hmentid=312543 Motor Type - Top Speed - Top Range - Battery 24V/500W 16mph (26KM/H) 17 M (28KM) 24V20AH 36V/500W 19mph (31KM/H) 19 M (31KM) 36V15AH 48V/500W 26mph (43KM/H) 26 M (43KM) 48V15AH 48V/1000W 32mph (52KM/H) 26 M (43KM) 48V15AH 24V/350W(Geared Motor) 14.29mph (23KM/H) 12.42 M (20KM) 24V9AH 36V/350W(Geared Motor) 16.77mph (27KM/H) 19.25 M (31KM) 36V9AH Tire size in general is not going to make too much of a difference, unless you make a big jump from 26x2.125 to 26x1.0 or 700c x 23mm to 700c x 52mm. Note that a 26" wheel with a 2.125" tire has roughly the same rolling diameter as a 700c wheel with a 23mm tires. Wheel size will make a big difference. A 26" wheel will need a different motor (RPM) than a 20" wheel. |
Also, keep in mind that slower RPM does NOT mean high torque. A fast wind and a slow wind of the same motor will have similar torque ouput, but putting too fast of a wind on a big wheel will cause the motor to operate inefficiently, and generate too much heat.
The torque comes from the current (amps), speed from the voltage. |
updated Q100 motor information based on my testing and new motor types.
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Originally Posted by chas58
(Post 15543102)
Also, keep in mind that slower RPM does NOT mean high torque. A fast wind and a slow wind of the same motor will have similar torque ouput, but putting too fast of a wind on a big wheel will cause the motor to operate inefficiently, and generate too much heat.
The torque comes from the current (amps), speed from the voltage. |
Originally Posted by NoPhart
(Post 19020483)
With all that in mind, what is the best way to get the most torque out of a Q100H geared front hub motor? Or maybe a better way to ask that (if I am understanding correctly) is how much amp's can a Q100H handle? Do any of the bottle battery built-in controllers have amp adjustments to get more torque?
Short answer: buy a physically bigger motor. A MAC is twice the size and can take twice the current (30-40amps). If you have an old Q100, you could purchase a bare Q100H motor and just swap out the core into your old wheel. This will reportedly give you more torque I don't feel much torque difference between a 201 and a 328rpm motor. Maybe 10% difference? The biggest difference is the 328 has a (theoretically) higher top speed, and the 201 can go slower without generating too much heat (i.e. full throttle hill climbing). People tend to run into problems at 20amps, 17 amps is safe (and that is a bit of a jump over the 14amp standard controllers). MotoMech turned me on to a nice 36v17a controller from elifebikes, although it is a bit too big for my taste: 36V/48V 350W 9Mosfets Brushless Hub Motor Controller - The people who had problems at 20amps or more tended to run at 48v as I recall, giving almost 1000 watts. That is a bit much. You could probably do 20 amps at 36v, keeping it to a more reasonable 750 watts. That is about twice the nominally rated power. A judicious usage of 750 watts is about the upper limit for a Q100. to adjust the amps you can: - purchase a controller with higher rated amps - solder the shunt of a 15 amp controller to give more current - purchase a programmable Infineon Controller: 6 fet IRFB3077 Infineon Controller (Motor With Hall Sensors) |
Thanks C58. looking to experiment with a small diameter geared front hub motor possibly mounted within the frame triangle driving the crank with throttle only for simple climbing assist. I started a separate thread HERE trying to identify any small diameter front hub motors that might work that have the wiring coming out of the right side of the hub itself and a disc brake mount on the left. Need the narrow width of front hubs at 100mm and perfer black.
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