How to get higher top speed on my custom electric kick bike.

[reibenreve]

I am running 52v with 35a with 12fets controller setup. with shunt mod.

Battery is high discharge cells LG - MJ1 - 28.5AH

Wheel diameters are 16inch front back, running the new LeafMotor 1000w.

Right now with my load on it, I can go 58kph but I am trying to go faster. How much can I push a motor before it melts down? 3x the rated wattage? or can I go more? My usual distance of traveling is about 40km.

Should I further increase the voltage or current? I know current is gonna bring more heat to the setup.

From my basic understanding from the forum. Voltage = Speed, Current = Torque but then there are also legit equations of Voltage X Current = Power.

Any advise for me?

I attached an interesting snap of my ride.

 

[dogman dan]

You could push up to 3000w per motor on that thing. The speed will come when you bump up to 72v. You very likely are maxed out for speed at your current voltage.

More amps to get the wattage higher will just make it ride perky, but not a lot faster.

 

[reibenreve]

You could push up to 3000w per motor on that thing. The speed will come when you bump up to 72v. You very likely are maxed out for speed at your current voltage.

More amps to get the wattage higher will just make it ride perky, but not a lot faster.

Thank you dogman, I did like you've suggested and actually made a quick e-turbo to bump the voltage to 96v when I need it with a relay toggle.

I see improvement but at the end of the day I am still stuck with 68kph, the increment in speed was a little lower than expected even with almost 1.5x the voltage through the system. Running ebike simulator seems to tell me I can get more but in reality I am not

I wonder if the motor is at it's limit? After running 96v for about 10mins, motor is only luke warm so I want to believe it can handle more experimental abuse. From my email exchange with leafmotor, my motor is at a default winding of 4T ( Max 731rpm )

It's a http://www.leafbike.com/products/e-...-hub-motor-wheel-electric-bike-motor-983.html

To get more speed, would you suggest anything else besides ordering a new 3T speed wind instead?

 

[liveforphysics]

A controller with timing advance can buy you another 20% top speed or so if you're not already controller power limited. If you are already power limited, then bigger controllers. If motors get too hot drill or oil fill motors.

Otherwise if your motor windings dont have a way to make a series connection into a parallel connection somewhere, your least effort path to go faster is larger diameter wheels and/or lower turn count motors.

 

[reibenreve]

A controller with timing advance can buy you another 20% top speed or so if you're not already controller power limited. If you are already power limited, then bigger controllers. If motors get too hot drill or oil fill motors.

Otherwise if your motor windings dont have a way to make a series connection into a parallel connection somewhere, your least effort path to go faster is larger diameter wheels and/or lower turn count motors.

I am thinking to for a stronger controller before I drop my money on a lower turn count motor.

But stronger controller means bigger dimension and so I will have to mount the controller outside like how stealth bike does it.

I will take the advise from you guys, I will look into a better controller and see if it gets me more top speed.

PS: Is this any good? http://www.ecyclotron.com/product/crystalyte-controllers-18-fets/

 

[brumbrum]

Cool bike 8) . Standing upright on that thing doing 40+mph would give some serious wind resistance on your body. It looks like real fun. Get the voltage up for sure, or as said... Bigger wheels if you have reached max rpm of the motor.

This controller will not let you down... http://endless-sphere.com/forums/viewtopic.php?f=31&t=16605