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Old 12-25-14, 04:28 PM   #1
DrkAngel
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Lightbulb Currie Revolution

Currie - Currie Tech has officially ended the eZip eBikes line, scooters still produced.

They have acquired or obtained marketing rights for Haibike.

Top notch mid-drive line of eBikes.
15 models available Spring of 2015



The iZip line is still alive!
Nearly every model upgraded and enhanced.
12 models
3 with mid-drive and the rest are hub motor, no more external motors.
And
only 1 model remaining that does not come with the Lithium battery as standard equipment.



iZip 2015

They are gearing up for the USA market!
Most models are now 20mph/32kph capable and through some wizardry, possibly borrowed from HaiBike, they now have a pedal assist mode with 28mph/45kph capability!

They are still marketing the eFlow line

Which look great ... by the specs

E-SYSTEM
Specifications Description
Motor Rear hub 500W, gearless, high speed
Battery Lithium-ion 36V14.5Ah 522Wh
Display eFlow LCD multi-function display with power adjustment features
Speed 20 mph / 32 kph motor only, 28 mph / 45kph with hard pedaling
Range 30-45 miles/48-72 km with Normal Pedaling
FRAME
Specifications Description
Frame Aluminium 6061 hydroformed
Fork RST alloy headshox w/30mm travel
RearShock -
Headset FSA internal
DRIVETRAIN
Specifications Description
Shift lever SRAM SL700
Front derailleur SRAM Apex
Rear derailleur SRAM Apex
Cassette or freewheel SRAM Apex 1050, 11-32T, 10-speed
Chain FSA CN-910
Pedals Wellgo platform
WHEELSET
Specifications Description
Wheelset -
Hubs ft/rear Alloy disc w/QR, motor rear
Rim Alex FR-30 doublewall
Spokes Stainless
Tires Maxxis M2003 26x2
COMPONENTS
Specifications Description
Brakes Tektro Auriga E-Sub hydraulic disc, 180/160mm rotors
Brake Lever Tektro Auriga E-Comp w/motor cut-off switch
Handlebar Kalloy no rise
Stem Kalloy 3D forged
Grips Velo kraton
Saddle Velo racing
Seatpost eFlow integrated w/battery
Accessories Kickstand
optional city kit with fenders, rack, lighting system
WEIGHT
Specifications Description
50.5 lb w/o pedals

But I just can't get past the phallic nature of the battery pack!
Maybe if I was a girl?



2015 eFlow
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Old 12-26-14, 06:30 PM   #2
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Lightbulb 20mph motor only - 28mph w/pedal assist

I had assumed that the new iZips performed some intricate wizardry to attain 20mph motor only and 28mph with "hard pedal assist" ...
After further research ...turns out this is readily and simple to match.
1st clue was the 350w motor.
350w is is the necessary motor output to sustain 20mph.
My previous models demonstrated that upping the voltage and limiting the current provides an extended shallow watt output curve, rather than the central bulge of power from a full current motor.

After a bit of searching I matched a possible torque curve ...



While technically true, the 28mph requires nearly 500w of pedal input.
500w of pedal input is equivalent to 23mph pedal only effort.

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Old 12-27-14, 08:51 AM   #3
DrkAngel
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Quote:
Originally Posted by DrkAngel View Post
I had assumed that the new iZips performed some intricate wizardry to attain 20mph motor only and 28mph with "hard pedal assist" ...
After further research ...turns out this is readily and simple to match.
1st clue was the 350w motor.
350w is is the necessary motor output to sustain 20mph.
My previous models demonstrated that upping the voltage and limiting the current provides an extended shallow watt output curve, rather than the central bulge of power from a full current motor.

After a bit of searching I matched a possible torque curve ...



While technically true, the 28mph requires nearly 500w of pedal input.
500w of pedal input is equivalent to 23mph pedal only effort.

It seems obvious that these HaiBikes use a current limited controller, most likely 10A.
Find a compatible 20A controller and ... wow
750w output and 27mph motor only and ...
substantial assist past 30mph!

Alternate possible motor profile:


Durability of motor and 10 speed drivetrain are definitely to be considered tho ...
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Old 12-28-14, 08:03 AM   #4
DrkAngel
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Hot damn!
Just realized something ...
At 48V 10A controller this current regulated motor outputs 350w at the optimal point for 20mph USA "legal".
At 48V 20A controller this current regulated motor outputs 750w USA "legal" max motor output.
A simple PAS sensor and module could either limit controller amps or throttle signal strength.
Either, could limit a 20A = 750w motor output to 10A 350w motor output.
This could qualify as USA "legal" meeting the "20mph limit from motor only" and "750w maximum motor output".
Just turn the pedals around (No longer "motor only" = Turbo Engaged!) and hit near 30mph ... 30mph+ with just a minimal effort applied.



Your motor only speed is where Power intersects Load

"Load Line" (Black) is for a mountain Bike ... Race bike, recumbent etc., would require PAS adjustment to meet "legal".

Last edited by DrkAngel; 12-28-14 at 08:20 AM.
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