Could anyone recommend a controller for this 4KW hub

flexy

flexy

100 W
Joined
Jun 18, 2010
Messages
215
Location
Brighton, UK
I am trying to get an e-max scooter to run on 72V (they are 48V stock)

I have tried it with an 18fet infineon but that got hot and soon blew the fets. I was pulling 5kw at the time according to my CA.

It also cogged badly at low speed and when running at 20mph it smoothed out, but there would be an occasional bump like the motor was skipping a beat/misfiring :?

I guess I need a bigger controller , sevcon are a bit pricy but the Lyen 24fet might work (though I'm still concerned about cogging at low speed)
There are also many from Kelly but I'm confused as to which would be suitable. Any advice apreciated.

This is it running with the infineon 18fet on a stand, the CA seemed to give up on the speed at ~60mph!

[youtube]lLrI50E_cuU[/youtube]
 
Of course the 18fet blew. It looks like a wrong wiring combo, because it's using 1500W just to spin the tire in air. My similar sized hubbie runs well under 5A at 67mph no-load. That 21A is way too high. Poor running and high no-load current screams incorrect wiring combo.

As far as controllers go I may have a source. What are the dimensions of your available space?

John
 
Hi John,
I hadn't set the CA with the correct shunt value it was set at 1mOhm, but the actual shunt in that controller is 0.266 mOhm.I just hooked it up to measure speed.

I tried all 36 different combos of phase and hall, 3 of which gave the best results, does this sound correct?

I can fit any size controller plenty of room on the outside of the bike. I would be interested in what controllers you might have available.

Tom
 
An uncalibrated CA explains it. No, trying all 36 combos it not correct or ever necessary. Smooth running and low no-load current means you got it right, and from what I've read the E-Max uses a bit over 5A no-load. What's the dimension of the space you have? I may have a solution for you that is better but more economical than a Kelly.

John
 
The original controller was quite compact and hidden under the seat, made by http://www.proud-eagle.com/pro6.asp I believe.
215mm L 78mm W 85mm H inc fins. But I would be happy to mount the controller on the exterior of the bike to aid cooling.
It could do 80A max at 48V but too slow for the hills around here.

My chinese scoot with 2000W motor and ecrazyman 18fet regularly pulls 7KW + .

This E-max is bigger and heavier so I expect it will pull even more.
 
You must log in or register to reply here.
Back
Top